Merge pull request #1855 from YunoHost/helpers-2.1

Helpers 2.1

helpers/helpers

@@ -11,7 +11,7 @@ set +x
 
 YNH_HELPERS_DIR="$SCRIPT_DIR/helpers.v${YNH_HELPERS_VERSION}.d"
 case "$YNH_HELPERS_VERSION" in
-    "1" | "2")
+    "1" | "2" | "2.1")
         readarray -t HELPERS < <(find -L "$YNH_HELPERS_DIR" -mindepth 1 -maxdepth 1 -type f)
         for helper in "${HELPERS[@]}"; do
             [ -r "$helper" ] && source "$helper"

helpers/helpers.v1.d/mysql

@@ -174,6 +174,19 @@ ynh_mysql_user_exists() {
     fi
 }
 
+# Check if a mysql database exists
+#
+# [internal]
+#
+# usage: ynh_mysql_database_exists database
+# | arg: database    - the database for which to check existence
+# | exit: Return 1 if the database doesn't exist, 0 otherwise
+#
+ynh_mysql_database_exists() {
+    local database=$1
+    mysqlshow | grep -qE "^|\s+$database\s+|"
+}
+
 # Drop a user
 #
 # [internal]
@@ -236,7 +249,7 @@ ynh_mysql_remove_db() {
     # Manage arguments with getopts
     ynh_handle_getopts_args "$@"
 
-    if mysqlshow | grep -q "^| $db_name "; then
+    if ynh_mysql_database_exists "$db_name"; then
         ynh_mysql_drop_db $db_name
     else
         ynh_print_warn --message="Database $db_name not found"

helpers/helpers.v1.d/nodejs

@@ -83,7 +83,7 @@ ynh_use_nodejs() {
 # ynh_install_nodejs will install the version of node provided as argument by using n.
 #
 # usage: ynh_install_nodejs --nodejs_version=nodejs_version
-# | arg: -n, --nodejs_version=      - Version of node to install. When possible, your should prefer to use major version number (e.g. 8 instead of 8.10.0). The crontab will then handle the update of minor versions when needed.
+# | arg: -n, --nodejs_version=      - Version of node to install. When possible, your should prefer to use major version number (e.g. 8 instead of 8.10.0).
 #
 # `n` (Node version management) uses the `PATH` variable to store the path of the version of node it is going to use.
 # That's how it changes the version
@@ -149,9 +149,6 @@ ynh_install_nodejs() {
     # Store nodejs_version into the config of this app
     ynh_app_setting_set --app=$app --key=nodejs_version --value=$nodejs_version
 
-    # Build the update script and set the cronjob
-    ynh_cron_upgrade_node
-
     ynh_use_nodejs
 }
 
@@ -180,62 +177,5 @@ ynh_remove_nodejs() {
         ynh_secure_remove --file="$n_install_dir"
         ynh_secure_remove --file="/usr/local/n"
         sed --in-place "/N_PREFIX/d" /root/.bashrc
-        rm --force /etc/cron.daily/node_update
     fi
 }
-
-# Set a cron design to update your node versions
-#
-# [internal]
-#
-# This cron will check and update all minor node versions used by your apps.
-#
-# usage: ynh_cron_upgrade_node
-#
-# Requires YunoHost version 2.7.12 or higher.
-ynh_cron_upgrade_node() {
-    # Build the update script
-    cat >"$n_install_dir/node_update.sh" <<EOF
-#!/bin/bash
-
-version_path="$node_version_path"
-n_install_dir="$n_install_dir"
-
-# Log the date
-date
-
-# List all real installed version of node
-all_real_version="\$(find \$version_path/* -maxdepth 0 -type d | sed "s@\$version_path/@@g")"
-
-# Keep only the major version number of each line
-all_real_version=\$(echo "\$all_real_version" | sed 's/\..*\$//')
-
-# Remove double entries
-all_real_version=\$(echo "\$all_real_version" | sort --unique)
-
-# Read each major version
-while read version
-do
-    echo "Update of the version \$version"
-    sudo \$n_install_dir/bin/n \$version
-
-    # Find the last "real" version for this major version of node.
-    real_nodejs_version=\$(find \$version_path/\$version* -maxdepth 0 | sort --version-sort | tail --lines=1)
-    real_nodejs_version=\$(basename \$real_nodejs_version)
-
-    # Update the symbolic link for this version
-    sudo ln --symbolic --force --no-target-directory \$version_path/\$real_nodejs_version \$version_path/\$version
-done <<< "\$(echo "\$all_real_version")"
-EOF
-
-    chmod +x "$n_install_dir/node_update.sh"
-
-    # Build the cronjob
-    cat >"/etc/cron.daily/node_update" <<EOF
-#!/bin/bash
-
-$n_install_dir/node_update.sh >> $n_install_dir/node_update.log
-EOF
-
-    chmod +x "/etc/cron.daily/node_update"
-}

helpers/helpers.v2.1.d/apps

@@ -0,0 +1,213 @@
+#!/bin/bash
+
+# Install others YunoHost apps
+#
+# usage: ynh_install_apps --apps="appfoo?domain=domain.foo&path=/foo appbar?domain=domain.bar&path=/bar&admin=USER&language=fr&is_public=1&pass?word=pass&port=666"
+# | arg: -a, --apps=     - apps to install
+#
+# Requires YunoHost version *.*.* or higher.
+ynh_install_apps() {
+    # ============ Argument parsing =============
+	local -A args_array=([a]=apps=)
+	local apps
+	ynh_handle_getopts_args "$@"
+    # ===========================================
+
+	# Split the list of apps in an array
+	local apps_list=($(echo $apps | tr " " "\n"))
+	local apps_dependencies=""
+	
+	# For each app
+	for one_app_and_its_args in "${apps_list[@]}"
+	do
+		# Retrieve the name of the app (part before ?)
+		local one_app=$(cut -d "?" -f1 <<< "$one_app_and_its_args")
+		[ -z "$one_app" ] && ynh_die "You didn't provided a YunoHost app to install"
+
+		yunohost tools update apps
+		
+		# Installing or upgrading the app depending if it's installed or not
+		if ! yunohost app list --output-as json --quiet | jq -e --arg id $one_app '.apps[] | select(.id == $id)' >/dev/null
+		then
+			# Retrieve the arguments of the app (part after ?)
+			local one_argument=""
+			if [[ "$one_app_and_its_args" == *"?"* ]]; then
+				one_argument=$(cut -d "?" -f2- <<< "$one_app_and_its_args")
+				one_argument="--args $one_argument"
+			fi
+			
+			# Install the app with its arguments
+			yunohost app install $one_app $one_argument
+		else
+			# Upgrade the app
+			yunohost app upgrade $one_app
+		fi
+
+		if [ ! -z "$apps_dependencies" ]
+		then
+			apps_dependencies="$apps_dependencies, $one_app"
+		else
+			apps_dependencies="$one_app"
+		fi
+	done
+
+	ynh_app_setting_set --key=apps_dependencies --value="$apps_dependencies"
+}
+
+# Remove other YunoHost apps
+#
+# Other YunoHost apps will be removed only if no other apps need them.
+#
+# usage: ynh_remove_apps
+#
+# Requires YunoHost version *.*.* or higher.
+ynh_remove_apps() {
+	# Retrieve the apps dependencies of the app
+	local apps_dependencies=$(ynh_app_setting_get --key=apps_dependencies)
+	ynh_app_setting_delete --key=apps_dependencies
+
+	if [ ! -z "$apps_dependencies" ]
+	then
+		# Split the list of apps dependencies in an array
+		local apps_dependencies_list=($(echo $apps_dependencies | tr ", " "\n"))
+		
+		# For each apps dependencies
+		for one_app in "${apps_dependencies_list[@]}"
+		do
+			# Retrieve the list of installed apps
+			local installed_apps_list=$(yunohost app list --output-as json --quiet | jq -r .apps[].id)
+			local required_by=""
+			local installed_app_required_by=""
+
+			# For each other installed app
+			for one_installed_app in $installed_apps_list
+			do
+				# Retrieve the other apps dependencies
+				one_installed_apps_dependencies=$(ynh_app_setting_get --app=$one_installed_app --key=apps_dependencies)
+				if [ ! -z "$one_installed_apps_dependencies" ]
+				then
+					one_installed_apps_dependencies_list=($(echo $one_installed_apps_dependencies | tr ", " "\n"))
+
+					# For each dependency of the other apps
+					for one_installed_app_dependency in "${one_installed_apps_dependencies_list[@]}"
+					do
+						if [[ $one_installed_app_dependency == $one_app ]]; then
+							required_by="$required_by $one_installed_app"
+						fi
+					done
+				fi
+			done
+
+			# If $one_app is no more required
+			if [[ -z "$required_by" ]]
+			then
+				# Remove $one_app
+				ynh_print_info "Removing of $one_app"
+				yunohost app remove $one_app --purge
+			else
+				ynh_print_info "$one_app was not removed because it's still required by${required_by}"
+			fi
+		done
+	fi
+}
+
+# Spawn a Bash shell with the app environment loaded
+#
+# usage: ynh_spawn_app_shell --app="app"
+#     | arg: -a, --app=     - the app ID
+#
+# examples:
+#   ynh_spawn_app_shell --app="APP" <<< 'echo "$USER"'
+#   ynh_spawn_app_shell --app="APP" < /tmp/some_script.bash
+#
+# Requires YunoHost version 11.0.* or higher, and that the app relies on packaging v2 or higher.
+# The spawned shell will have environment variables loaded and environment files sourced
+# from the app's service configuration file (defaults to $app.service, overridable by the packager with `service` setting).
+# If the app relies on a specific PHP version, then `php` will be aliased that version. The PHP command will also be appended with the `phpflags` settings.
+ynh_spawn_app_shell() {
+    # ============ Argument parsing =============
+    local -A args_array=([a]=app=)
+    local app
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    # Force Bash to be used to run this helper
+    if [[ ! $0 =~ \/?bash$ ]]
+    then
+        ynh_print_warn "Please use Bash as shell"
+        exit 1
+    fi
+
+    # Make sure the app is installed
+    local installed_apps_list=($(yunohost app list --output-as json --quiet | jq -r .apps[].id))
+    if [[ " ${installed_apps_list[*]} " != *" ${app} "* ]]
+    then
+        ynh_print_warn "$app is not in the apps list"
+        exit 1
+    fi
+
+    # Make sure the app has its own user
+    if ! id -u "$app" &>/dev/null; then
+        ynh_print_warn "There is no \"$app\" system user"
+        exit 1
+    fi
+
+    # Make sure the app has an install_dir setting
+    local install_dir=$(ynh_app_setting_get --key=install_dir)
+    if [ -z "$install_dir" ]
+    then
+        ynh_print_warn "$app has no install_dir setting (does it use packaging format >=2?)"
+        exit 1
+    fi
+
+    # Load the app's service name, or default to $app
+    local service=$(ynh_app_setting_get --key=service)
+    [ -z "$service" ] && service=$app;
+
+    # Export HOME variable
+    export HOME=$install_dir;
+
+    # Load the Environment variables from the app's service
+    local env_var=$(systemctl show $service.service -p "Environment" --value)
+    [ -n "$env_var" ] && export $env_var;
+
+    # Force `php` to its intended version
+    # We use `eval`+`export` since `alias` is not propagated to subshells, even with `export`
+    local php_version=$(ynh_app_setting_get --key=php_version)
+    local phpflags=$(ynh_app_setting_get --key=phpflags)
+    if [ -n "$php_version" ]
+    then
+        eval "php() { php${php_version} ${phpflags} \"\$@\"; }"
+        export -f php
+    fi
+
+    # Source the EnvironmentFiles from the app's service
+    local env_files=($(systemctl show $service.service -p "EnvironmentFiles" --value))
+    if [ ${#env_files[*]} -gt 0 ]
+    then
+        # set -/+a enables and disables new variables being automatically exported. Needed when using `source`.
+        set -a
+        for file in ${env_files[*]}
+        do
+            [[ $file = /* ]] && source $file
+        done
+        set +a
+    fi
+
+    # Activate the Python environment, if it exists
+    if [ -f $install_dir/venv/bin/activate ]
+    then
+        # set -/+a enables and disables new variables being automatically exported. Needed when using `source`.
+        set -a
+        source $install_dir/venv/bin/activate
+        set +a
+    fi
+
+    # cd into the WorkingDirectory set in the service, or default to the install_dir
+    local env_dir=$(systemctl show $service.service -p "WorkingDirectory" --value)
+    [ -z $env_dir ] && env_dir=$install_dir;
+    cd $env_dir
+
+    # Spawn the app shell
+    su -s /bin/bash $app
+}

helpers/helpers.v2.1.d/apt

@@ -0,0 +1,333 @@
+#!/bin/bash
+
+YNH_APT_INSTALL_DEPENDENCIES_REPLACE="true"
+
+# Define and install dependencies with a equivs control file
+#
+# [packagingv1]
+#
+# This helper can/should only be called once per app
+#
+# example : ynh_install_app_dependencies dep1 dep2 "dep3|dep4|dep5"
+#
+# usage: ynh_install_app_dependencies dep [dep [...]]
+# | arg: dep - the package name to install in dependence.
+# | arg: "dep1|dep2|…" - You can specify alternatives. It will require to install (dep1 or dep2, etc).
+#
+# Requires YunoHost version 2.6.4 or higher.
+ynh_apt_install_dependencies() {
+    local dependencies=$@
+    # Add a comma for each space between packages. But not add a comma if the space separate a version specification. (See  below)
+    dependencies="$(echo "$dependencies" | sed 's/\([^\<=\>]\)\ \([^(]\)/\1, \2/g')"
+    local dependencies=${dependencies//|/ | }
+    local version=$(ynh_read_manifest "version")
+    local app_ynh_deps="${app//_/-}-ynh-deps" # Replace all '_' by '-', and append -ynh-deps
+
+    # Handle specific versions
+    if [[ "$dependencies" =~ [\<=\>] ]]; then
+        # Replace version specifications by relationships syntax
+        # https://www.debian.org/doc/debian-policy/ch-relationships.html
+        # Sed clarification
+        # [^(\<=\>] ignore if it begins by ( or < = >. To not apply twice.
+        # [\<=\>] matches < = or >
+        # \+ matches one or more occurence of the previous characters, for >= or >>.
+        # [^,]\+ matches all characters except ','
+        # Ex: 'package>=1.0' will be replaced by 'package (>= 1.0)'
+        dependencies="$(echo "$dependencies" | sed 's/\([^(\<=\>]\)\([\<=\>]\+\)\([^,]\+\)/\1 (\2 \3)/g')"
+    fi
+
+    # ############################## #
+    # Specific tweaks related to PHP #
+    # ############################## #
+
+    # Check for specific php dependencies which requires sury
+    # This grep will for example return "7.4" if dependencies is "foo bar php7.4-pwet php-gni"
+    # The (?<=php) syntax corresponds to lookbehind ;)
+    local specific_php_version=$(echo $dependencies | grep -oP '(?<=php)[0-9.]+(?=-|\>|)' | sort -u)
+
+    if [[ -n "$specific_php_version" ]]
+    then
+        # Cover a small edge case where a packager could have specified "php7.4-pwet php5-gni" which is confusing
+        [[ $(echo $specific_php_version | wc -l) -eq 1 ]] \
+            || ynh_die "Inconsistent php versions in dependencies ... found : $specific_php_version"
+
+        dependencies+=", php${specific_php_version}, php${specific_php_version}-fpm, php${specific_php_version}-common"
+
+        local old_php_version=$(ynh_app_setting_get --key=php_version)
+
+        # If the PHP version changed, remove the old fpm conf
+        if [ -n "$old_php_version" ] && [ "$old_php_version" != "$specific_php_version" ]; then
+            local old_php_fpm_config_dir=$(ynh_app_setting_get --key=fpm_config_dir)
+            local old_php_finalphpconf="$old_php_fpm_config_dir/pool.d/$app.conf"
+
+            if [[ -f "$old_php_finalphpconf" ]]
+            then
+                ynh_backup_if_checksum_is_different "$old_php_finalphpconf"
+                ynh_remove_fpm_config
+            fi
+        fi
+        # Store php_version into the config of this app
+        ynh_app_setting_set --key=php_version --value=$specific_php_version
+
+        # Set the default php version back as the default version for php-cli.
+        if test -e /usr/bin/php$YNH_DEFAULT_PHP_VERSION
+        then
+            update-alternatives --set php /usr/bin/php$YNH_DEFAULT_PHP_VERSION
+        fi
+    elif grep --quiet 'php' <<< "$dependencies"; then
+        ynh_app_setting_set --key=php_version --value=$YNH_DEFAULT_PHP_VERSION
+    fi
+
+    # Specific tweak related to Postgresql (cf end of the helper)
+    local psql_installed="$(_ynh_apt_package_is_installed "postgresql-$PSQL_VERSION" && echo yes || echo no)"
+
+    # The first time we run ynh_install_app_dependencies, we will replace the
+    # entire control file (This is in particular meant to cover the case of
+    # upgrade script where ynh_install_app_dependencies is called with this
+    # expected effect) Otherwise, any subsequent call will add dependencies
+    # to those already present in the equivs control file.
+    if [[ $YNH_APT_INSTALL_DEPENDENCIES_REPLACE == "true" ]]
+    then
+        YNH_APT_INSTALL_DEPENDENCIES_REPLACE="false"
+    else
+        local current_dependencies=""
+        if _ynh_apt_package_is_installed "${app_ynh_deps}"
+        then
+            current_dependencies="$(dpkg-query --show --showformat='${Depends}' ${app_ynh_deps}) "
+            current_dependencies=${current_dependencies// | /|}
+        fi
+        dependencies="$current_dependencies, $dependencies"
+    fi
+
+    # #############################
+    # Actual install using equivs #
+    # #############################
+
+    # Prepare the virtual-dependency control file for equivs
+    local TMPDIR=$(mktemp --directory)
+    cat >${TMPDIR}/control <<EOF # Make a control file for equivs-build
+Section: misc
+Priority: optional
+Package: ${app_ynh_deps}
+Version: ${version}
+Depends: ${dependencies}
+Architecture: all
+Description: Fake package for ${app} (YunoHost app) dependencies
+ This meta-package is only responsible of installing its dependencies.
+EOF
+
+    # Make sure to delete equivs' legacy compat file
+    # It's now handle somewhat magically through the control file
+    rm -f /usr/share/equivs/template/debian/compat
+
+    _ynh_apt update
+
+    _ynh_wait_dpkg_free
+
+    (
+        # NB: this is in a subshell (though not sure why exactly not just use pushd/popd...)
+        cd "$TMPDIR"
+        # Install the fake package without its dependencies with dpkg --force-depends
+        LC_ALL=C equivs-build ./control 2>&1
+        LC_ALL=C dpkg --force-depends --install "./${app_ynh_deps}_${version}_all.deb" 2>&1 | tee ./dpkg_log
+    )
+
+    # Then install the missing dependencies with apt install
+    _ynh_apt_install --fix-broken \
+        || { # If the installation failed
+            # (the following is ran inside { } to not start a subshell otherwise ynh_die wouldnt exit the original process)
+            # Parse the list of problematic dependencies from dpkg's log ...
+            # (relevant lines look like: "foo-ynh-deps depends on bar; however:")
+            local problematic_dependencies="$(cat $TMPDIR/dpkg_log | grep -oP '(?<=-ynh-deps depends on ).*(?=; however)' | tr '\n' ' ')"
+            # Fake an install of those dependencies to see the errors
+            # The sed command here is, Print only from 'Reading state info' to the end.
+            [[ -n "$problematic_dependencies" ]] && _ynh_apt_install $problematic_dependencies --dry-run 2>&1 | sed --quiet '/Reading state info/,$p' | grep -v "fix-broken\|Reading state info" >&2
+            ynh_die "Unable to install dependencies"
+    }
+    rm --recursive --force "$TMPDIR" # Remove the temp dir.
+
+    # check if the package is actually installed
+    _ynh_apt_package_is_installed "${app_ynh_deps}" || ynh_die "Unable to install dependencies"
+
+    # Specific tweak related to Postgresql
+    # -> trigger postgresql regenconf if we may have just installed postgresql
+    local psql_installed2="$(_ynh_apt_package_is_installed "postgresql-$PSQL_VERSION" && echo yes || echo no)"
+    if [[ "$psql_installed" != "$psql_installed2" ]]
+    then
+        yunohost tools regen-conf postgresql
+    fi
+
+}
+
+# Remove fake package and its dependencies
+#
+# [packagingv1]
+#
+# Dependencies will removed only if no other package need them.
+#
+# usage: ynh_apt_remove_dependencies
+#
+# Requires YunoHost version 2.6.4 or higher.
+ynh_apt_remove_dependencies() {
+    local app_ynh_deps="${app//_/-}-ynh-deps" # Replace all '_' by '-', and append -ynh-deps
+
+    local current_dependencies=""
+    if _ynh_apt_package_is_installed "${app_ynh_deps}"; then
+        current_dependencies="$(dpkg-query --show --showformat='${Depends}' ${app_ynh_deps}) "
+        current_dependencies=${current_dependencies// | /|}
+    fi
+
+    # Edge case where the app dep may be on hold,
+    # cf https://forum.yunohost.org/t/migration-error-cause-of-ffsync/20675/4
+    if apt-mark showhold | grep -q -w ${app_ynh_deps}
+    then
+        apt-mark unhold ${app_ynh_deps}
+    fi
+
+    # Remove the fake package and its dependencies if they not still used.
+    # (except if dpkg doesn't know anything about the package,
+    # which should be symptomatic of a failed install, and we don't want bash to report an error)
+    if dpkg-query --show ${app_ynh_deps} &>/dev/null
+    then
+        _ynh_apt autoremove --purge ${app_ynh_deps}
+    fi
+}
+
+# Install packages from an extra repository properly.
+#
+# [packagingv1]
+#
+# usage: ynh_apt_install_dependencies_from_extra_repository --repo="repo" --package="dep1 dep2" --key=key_url
+# | arg: -r, --repo=    - Complete url of the extra repository.
+# | arg: -p, --package= - The packages to install from this extra repository
+# | arg: -k, --key=     - url to get the public key.
+#
+# Requires YunoHost version 3.8.1 or higher.
+ynh_apt_install_dependencies_from_extra_repository() {
+    # ============ Argument parsing =============
+    local -A args_array=([r]=repo= [p]=package= [k]=key=)
+    local repo
+    local package
+    local key
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    # Split the repository into uri, suite and components.
+    repo="${repo#deb }"
+    local uri="$(echo "$repo" | awk '{ print $1 }')"
+    local suite="$(echo "$repo" | awk '{ print $2 }')"
+    local component="${repo##$uri $suite }"
+
+    # Add the new repo in sources.list.d
+    mkdir --parents "/etc/apt/sources.list.d"
+    echo "deb $uri $suite $component" > "/etc/apt/sources.list.d/$app.list"
+
+    # Pin the new repo with the default priority, so it won't be used for upgrades.
+    # Build $pin from the uri without http and any sub path
+    local pin="${uri#*://}"
+    pin="${pin%%/*}"
+
+    # Pin repository
+    mkdir --parents "/etc/apt/preferences.d"
+    cat << EOF > "/etc/apt/preferences.d/$app"
+Package: *
+Pin: origin $pin
+Pin-Priority: 995
+EOF
+
+    mkdir --parents "/etc/apt/trusted.gpg.d"
+    # Timeout option is here to enforce the timeout on dns query and tcp connect (c.f. man wget)
+    wget --timeout 900 --quiet "$key" --output-document=- | gpg --dearmor | tee /etc/apt/trusted.gpg.d/$name.gpg >/dev/null
+
+    # Update the list of package with the new repo NB: we use -o
+    # Dir::Etc::sourcelist to only refresh this repo, because
+    # ynh_apt_install_dependencies will also call an ynh_apt update on its own
+    # and it's good to limit unecessary requests ...  Here we mainly want to
+    # validate that the url+key is correct before going further
+    _ynh_apt update -o Dir::Etc::sourcelist="/etc/apt/sources.list.d/$app.list"
+
+    # Install requested dependencies from this extra repository.
+    # NB: because of the mechanism with $ynh_apt_install_DEPENDENCIES_REPLACE,
+    # this will usually only *append* to the existing list of dependency, not
+    # replace the existing $app-ynh-deps
+    ynh_apt_install_dependencies "$package"
+
+    # Force to upgrade to the last version...
+    # Without doing apt install, an already installed dep is not upgraded
+    local apps_auto_installed="$(apt-mark showauto $package)"
+    _ynh_apt_install "$package"
+    [ -z "$apps_auto_installed" ] || apt-mark auto $apps_auto_installed
+
+    # Remove this extra repository after packages are installed
+    ynh_safe_rm "/etc/apt/sources.list.d/$app.list"
+    ynh_safe_rm "/etc/apt/preferences.d/$app"
+    ynh_safe_rm "/etc/apt/trusted.gpg.d/$app.gpg"
+    ynh_apt_update
+}
+
+
+#######################
+# Internal misc utils #
+#######################
+
+# Check if apt is free to use, or wait, until timeout.
+_ynh_wait_dpkg_free() {
+    local try
+    set +o xtrace # set +x
+    # With seq 1 17, timeout will be almost 30 minutes
+    for try in $(seq 1 17); do
+        # Check if /var/lib/dpkg/lock is used by another process
+        if lsof /var/lib/dpkg/lock >/dev/null; then
+            echo "apt is already in use..."
+            # Sleep an exponential time at each round
+            sleep $((try * try))
+        else
+            # Check if dpkg hasn't been interrupted and is fully available.
+            # See this for more information: https://sources.debian.org/src/apt/1.4.9/apt-pkg/deb/debsystem.cc/#L141-L174
+            local dpkg_dir="/var/lib/dpkg/updates/"
+
+            # For each file in $dpkg_dir
+            while read dpkg_file <&9; do
+                # Check if the name of this file contains only numbers.
+                if echo "$dpkg_file" | grep --perl-regexp --quiet "^[[:digit:]]+$"; then
+                    # If so, that a remaining of dpkg.
+                    ynh_print_warn "dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem."
+                    set -o xtrace # set -x
+                    return 1
+                fi
+            done 9<<<"$(ls -1 $dpkg_dir)"
+            set -o xtrace # set -x
+            return 0
+        fi
+    done
+    echo "apt still used, but timeout reached !"
+    set -o xtrace # set -x
+}
+
+# Check either a package is installed or not
+_ynh_apt_package_is_installed() {
+    local package=$1
+    dpkg-query --show --showformat='${db:Status-Status}' "$package" 2>/dev/null \
+        | grep --quiet "^installed$" &>/dev/null
+}
+
+# Return the installed version of an apt package, if installed
+_ynh_apt_package_version() {
+    if _ynh_apt_package_is_installed "$package"; then
+        dpkg-query --show --showformat='${Version}' "$package" 2>/dev/null
+    else
+        echo ''
+    fi
+}
+
+# APT wrapper for non-interactive operation
+_ynh_apt() {
+    _ynh_wait_dpkg_free
+    LC_ALL=C DEBIAN_FRONTEND=noninteractive apt-get --assume-yes --quiet -o=Acquire::Retries=3 -o=Dpkg::Use-Pty=0 $@
+}
+
+# Wrapper around "apt install" with the appropriate options
+_ynh_apt_install() {
+    _ynh_apt --no-remove --option Dpkg::Options::=--force-confdef \
+        --option Dpkg::Options::=--force-confold install $@
+}

helpers/helpers.v2.1.d/backup

@@ -0,0 +1,275 @@
+#!/bin/bash
+
+CAN_BIND=${CAN_BIND:-1}
+
+# Add a file or a directory to the list of paths to backup
+#
+# usage: ynh_backup /path/to/stuff
+#
+# NB : note that this helper does *NOT* perform any copy in itself, it only
+# declares stuff to be backuped via a CSV which is later picked up by the core
+#
+# NB 2 : there is a specific behavior for $data_dir (or childs of $data_dir) and
+# /var/log/$app which are *NOT* backedup during safety-backup-before-upgrade,
+# OR if the setting "do_not_backup_data" is equals 1 for that app
+#
+# The rationale is that these directories are usually too heavy to be integrated in every backup
+# (think for example about Nextcloud with quite a lot of data, or an app with a lot of media files...)
+#
+# This is coupled to the fact that $data_dir and the log dir won't be (and
+# should NOT) be deleted during remove, unless --purge is used. Hence, if the
+# upgrade fails and the script is removed prior to restoring the backup, the
+# data/logs are not destroyed.
+#
+ynh_backup() {
+
+    local target="$1"
+    local is_data=false
+
+    # If the path starts with /var/log/$app or $data_dir
+    if ([[ -n "${app:-}" ]] && [[ "$target" == "/var/log/$app*" ]]) || ([[ -n "${data_dir:-}" ]] && [[ "$target" == "$data_dir*" ]])
+    then
+        is_data=true
+    fi
+
+    if [[ -n "${app:-}" ]]
+    then
+        local do_not_backup_data=$(ynh_app_setting_get --key=do_not_backup_data)
+    fi
+
+    # If backing up core only (used by ynh_backup_before_upgrade),
+    # don't backup big data items
+    if [[ "$is_data" == true ]] && ([[ ${do_not_backup_data:-0} -eq 1 ]] || [[ ${BACKUP_CORE_ONLY:-0} -eq 1 ]]); then
+        if [ $BACKUP_CORE_ONLY -eq 1 ]; then
+            ynh_print_info "$target will not be saved, because 'BACKUP_CORE_ONLY' is set."
+        else
+            ynh_print_info "$target will not be saved, because 'do_not_backup_data' is set."
+        fi
+        return 1
+    fi
+
+    # ==============================================================================
+    # Format correctly source and destination paths
+    # ==============================================================================
+    # Be sure the source path is not empty
+    if [ ! -e "$target" ]; then
+        ynh_print_warn "File or folder '${target}' to be backed up does not exist"
+        return 1
+    fi
+
+    # Transform the source path as an absolute path
+    # If it's a dir remove the ending /
+    src_path=$(realpath "$target")
+
+    # Initialize the dest path with the source path relative to "/".
+    # eg: src_path=/etc/yunohost -> dest_path=etc/yunohost
+    dest_path="${src_path#/}"
+
+    # Check if dest_path already exists in tmp archive
+    if [[ -e "${dest_path}" ]]; then
+        ynh_print_warn "Destination path '${dest_path}' already exist"
+        return 1
+    fi
+
+    # Add the relative current working directory to the destination path
+    local rel_dir="${YNH_CWD#$YNH_BACKUP_DIR}"
+    rel_dir="${rel_dir%/}/"
+    dest_path="${rel_dir}${dest_path}"
+    dest_path="${dest_path#/}"
+    # ==============================================================================
+
+    # ==============================================================================
+    # Write file to backup into backup_list
+    # ==============================================================================
+    local src=$(echo "${src_path}" | sed --regexp-extended 's/"/\"\"/g')
+    local dest=$(echo "${dest_path}" | sed --regexp-extended 's/"/\"\"/g')
+    echo "\"${src}\",\"${dest}\"" >>"${YNH_BACKUP_CSV}"
+
+    # ==============================================================================
+
+    # Create the parent dir of the destination path
+    # It's for retro compatibility, some script consider ynh_backup creates this dir
+    mkdir --parents $(dirname "$YNH_BACKUP_DIR/${dest_path}")
+}
+
+# Return the path in the archive where has been stocked the origin path
+#
+# [internal]
+#
+# usage: _get_archive_path ORIGIN_PATH
+_get_archive_path() {
+    # For security reasons we use csv python library to read the CSV
+    python3 -c "
+import sys
+import csv
+with open(sys.argv[1], 'r') as backup_file:
+    backup_csv = csv.DictReader(backup_file, fieldnames=['source', 'dest'])
+    for row in backup_csv:
+        if row['source']==sys.argv[2].strip('\"'):
+            print(row['dest'])
+            sys.exit(0)
+    raise Exception('Original path for %s not found' % sys.argv[2])
+    " "${YNH_BACKUP_CSV}" "$1"
+    return $?
+}
+
+# Restore a file or a directory from the backup archive
+#
+# usage: ynh_restore /path/to/stuff
+#
+# examples:
+#     ynh_restore "/etc/nginx/conf.d/$domain.d/$app.conf"
+#
+# If the file or dir to be restored already exists on the system and is lighter
+# than 500 Mo, it is backed up in `/var/cache/yunohost/appconfbackup/`.
+# Otherwise, the existing file or dir is removed.
+#
+# if `apps/$app/etc/nginx/conf.d/$domain.d/$app.conf` exists, restore it into
+# `/etc/nginx/conf.d/$domain.d/$app.conf`
+# otheriwse, search for a match in the csv (eg: conf/nginx.conf) and restore it into
+# `/etc/nginx/conf.d/$domain.d/$app.conf`
+#
+# Requires YunoHost version 2.6.4 or higher.
+ynh_restore() {
+    target="$1"
+
+    local archive_path="$YNH_CWD${target}"
+
+    # If the path starts with /var/log/$app or $data_dir
+    local is_data=false
+    if ([[ -n "${app:-}" ]] && [[ "$target" == "/var/log/$app*" ]]) || ([[ -n "${data_dir:-}" ]] && [[ "$target" == "$data_dir*" ]])
+    then
+        is_data=true
+    fi
+
+    # If archive_path doesn't exist, search for a corresponding path in CSV
+    if [ ! -d "$archive_path" ] && [ ! -f "$archive_path" ] && [ ! -L "$archive_path" ]; then
+        if [[ "$is_data" == true ]]
+        then
+            ynh_print_info "Skipping $target which doesn't exists in the archive, probably because restoring from a safety-backup-before-upgrade"
+            # Assume it's not a big deal, we may be restoring a safety-backup-before-upgrade which doesnt contain those
+            return 0
+        else
+            # (get_archive_path will raise an exception if no match found)
+            archive_path="$YNH_BACKUP_DIR/$(_get_archive_path \"$target\")"
+        fi
+    fi
+
+    # Move the old directory if it already exists
+    if [[ -e "${target}" ]]; then
+        # Check if the file/dir size is less than 500 Mo
+        if [[ $(du --summarize --bytes ${target} | cut --delimiter="/" --fields=1) -le "500000000" ]]; then
+            local backup_file="/var/cache/yunohost/appconfbackup/${target}.backup.$(date '+%Y%m%d.%H%M%S')"
+            mkdir --parents "$(dirname "$backup_file")"
+            mv "${target}" "$backup_file" # Move the current file or directory
+        else
+            ynh_safe_rm "${target}"
+        fi
+    fi
+
+    # Restore target into target
+    mkdir --parents $(dirname "$target")
+
+    # Do a copy if it's just a mounting point
+    if mountpoint --quiet $YNH_BACKUP_DIR; then
+        if [[ -d "${archive_path}" ]]; then
+            archive_path="${archive_path}/."
+            mkdir --parents "$target"
+        fi
+        cp --archive "$archive_path" "${target}"
+    # Do a move if YNH_BACKUP_DIR is already a copy
+    else
+        mv "$archive_path" "${target}"
+    fi
+}
+
+# Restore all files that were previously backuped in an app backup script
+#
+# usage: ynh_restore_everything
+#
+# Requires YunoHost version 2.6.4 or higher.
+ynh_restore_everything() {
+    # Deduce the relative path of $YNH_CWD
+    local REL_DIR="${YNH_CWD#$YNH_BACKUP_DIR/}"
+    REL_DIR="${REL_DIR%/}/"
+
+    # For each destination path begining by $REL_DIR
+    cat ${YNH_BACKUP_CSV} | tr --delete $'\r' | grep --only-matching --no-filename --perl-regexp "^\".*\",\"$REL_DIR.*\"$" \
+        | while read line; do
+            local ARCHIVE_PATH=$(echo "$line" | grep --only-matching --no-filename --perl-regexp "^\".*\",\"$REL_DIR\K.*(?=\"$)")
+            ynh_restore "$ARCHIVE_PATH"
+        done
+}
+
+_ynh_file_checksum_exists() {
+    local file=$1
+    local checksum_setting_name=checksum_${file//[\/ ]/_} # Replace all '/' and ' ' by '_'
+    [[ -n "$(ynh_app_setting_get --key=$checksum_setting_name)" ]]
+}
+
+# Calculate and store a file checksum into the app settings
+#
+# usage: ynh_store_file_checksum /path/to/file
+ynh_store_file_checksum() {
+    local file=$1
+    local checksum_setting_name=checksum_${file//[\/ ]/_} # Replace all '/' and ' ' by '_'
+
+    ynh_app_setting_set --key=$checksum_setting_name --value=$(md5sum "$file" | cut --delimiter=' ' --fields=1)
+
+    if ynh_in_ci_tests; then
+        # Using a base64 is in fact more reversible than "replace / and space by _" ... So we can in fact obtain the original file path in an easy reliable way ...
+        local file_path_base64=$(echo "$file" | base64 -w0)
+        mkdir -p /var/cache/yunohost/appconfbackup/
+        cat $file > /var/cache/yunohost/appconfbackup/original_${file_path_base64}
+    fi
+
+    # If backup_file_checksum isn't empty, ynh_backup_if_checksum_is_different has made a backup
+    if [ -n "${backup_file_checksum-}" ]; then
+        # Print the diff between the previous file and the new one.
+        # diff return 1 if the files are different, so the || true
+        diff --report-identical-files --unified --color=always $backup_file_checksum $file >&2 || true
+    fi
+    # Unset the variable, so it wouldn't trig a ynh_store_file_checksum without a ynh_backup_if_checksum_is_different before it.
+    unset backup_file_checksum
+}
+
+# Verify the checksum and backup the file if it's different
+#
+# usage: ynh_backup_if_checksum_is_different /path/to/file
+#
+# This helper is primarily meant to allow to easily backup personalised/manually
+# modified config files.
+ynh_backup_if_checksum_is_different() {
+    local file=$1
+    local checksum_setting_name=checksum_${file//[\/ ]/_} # Replace all '/' and ' ' by '_'
+    local checksum_value=$(ynh_app_setting_get --key=$checksum_setting_name)
+    # backup_file_checksum isn't declare as local, so it can be reuse by ynh_store_file_checksum
+    backup_file_checksum=""
+    if [ -n "$checksum_value" ]; then                                                     # Proceed only if a value was stored into the app settings
+        if [ -e $file ] && ! echo "$checksum_value $file" | md5sum --check --status; then # If the checksum is now different
+
+            backup_file_checksum="/var/cache/yunohost/appconfbackup/$file.backup.$(date '+%Y%m%d.%H%M%S')"
+            mkdir --parents "$(dirname "$backup_file_checksum")"
+            cp --archive "$file" "$backup_file_checksum" # Backup the current file
+            ynh_print_warn "File $file has been manually modified since the installation or last upgrade. So it has been duplicated in $backup_file_checksum"
+            echo "$backup_file_checksum" # Return the name of the backup file
+            if ynh_in_ci_tests; then
+                local file_path_base64=$(echo "$file" | base64 -w0)
+                if test -e /var/cache/yunohost/appconfbackup/original_${file_path_base64}
+                then
+                    ynh_print_warn "Diff with the original file:"
+                    diff --report-identical-files --unified --color=always /var/cache/yunohost/appconfbackup/original_${file_path_base64} $file >&2 || true
+                fi
+            fi
+        fi
+    fi
+}
+
+# Delete a file checksum from the app settings
+#
+# usage: ynh_delete_file_checksum /path/to/file
+ynh_delete_file_checksum() {
+    local file=$1
+    local checksum_setting_name=checksum_${file//[\/ ]/_} # Replace all '/' and ' ' by '_'
+    ynh_app_setting_delete --key=$checksum_setting_name
+}

helpers/helpers.v2.1.d/config

@@ -0,0 +1,363 @@
+#!/bin/bash
+
+_ynh_app_config_get_one() {
+    local short_setting="$1"
+    local type="$2"
+    local bind="$3"
+    local getter="get__${short_setting}"
+    # Get value from getter if exists
+    if type -t $getter 2>/dev/null | grep -q '^function$' 2>/dev/null; then
+        old[$short_setting]="$($getter)"
+        formats[${short_setting}]="yaml"
+
+    elif [[ "$bind" == *"("* ]] && type -t "get__${bind%%(*}" 2>/dev/null | grep -q '^function$' 2>/dev/null; then
+        old[$short_setting]="$("get__${bind%%(*}" $short_setting $type $bind)"
+        formats[${short_setting}]="yaml"
+
+    elif [[ "$bind" == "null" ]]; then
+        old[$short_setting]="YNH_NULL"
+
+    # Get value from app settings or from another file
+    elif [[ "$type" == "file" ]]; then
+        if [[ "$bind" == "settings" ]]; then
+            ynh_die "File '${short_setting}' can't be stored in settings"
+        fi
+        old[$short_setting]="$(ls "$(echo $bind | sed s@__INSTALL_DIR__@${install_dir:-}@ | sed s/__APP__/$app/)" 2>/dev/null || echo YNH_NULL)"
+        file_hash[$short_setting]="true"
+
+    # Get multiline text from settings or from a full file
+    elif [[ "$type" == "text" ]]; then
+        if [[ "$bind" == "settings" ]]; then
+            old[$short_setting]="$(ynh_app_setting_get $app $short_setting)"
+        elif [[ "$bind" == *":"* ]]; then
+            ynh_die "For technical reasons, multiline text '${short_setting}' can't be stored automatically  in a variable file, you have to create custom getter/setter"
+        else
+            old[$short_setting]="$(cat $(echo $bind | sed s@__INSTALL_DIR__@${install_dir:-}@ | sed s/__APP__/$app/) 2>/dev/null || echo YNH_NULL)"
+        fi
+
+    # Get value from a kind of key/value file
+    else
+        local bind_after=""
+        if [[ "$bind" == "settings" ]]; then
+            bind=":/etc/yunohost/apps/$app/settings.yml"
+        fi
+        local bind_key_="$(echo "$bind" | cut -d: -f1)"
+        bind_key_=${bind_key_:-$short_setting}
+        if [[ "$bind_key_" == *">"* ]]; then
+            bind_after="$(echo "${bind_key_}" | cut -d'>' -f1)"
+            bind_key_="$(echo "${bind_key_}" | cut -d'>' -f2)"
+        fi
+        local bind_file="$(echo "$bind" | cut -d: -f2 | sed s@__INSTALL_DIR__@${install_dir:-}@ | sed s/__APP__/$app/)"
+        old[$short_setting]="$(ynh_read_var_in_file --file="${bind_file}" --key="${bind_key_}" --after="${bind_after}")"
+
+    fi
+}
+_ynh_app_config_apply_one() {
+    local short_setting="$1"
+    local setter="set__${short_setting}"
+    local bind="${binds[$short_setting]}"
+    local type="${types[$short_setting]}"
+    if [ "${changed[$short_setting]}" == "true" ]; then
+        # Apply setter if exists
+        if type -t $setter 2>/dev/null | grep -q '^function$' 2>/dev/null; then
+            $setter
+
+        elif [[ "$bind" == *"("* ]] && type -t "set__${bind%%(*}" 2>/dev/null | grep -q '^function$' 2>/dev/null; then
+            "set__${bind%%(*}" $short_setting $type $bind
+
+        elif [[ "$bind" == "null" ]]; then
+            return
+
+        # Save in a file
+        elif [[ "$type" == "file" ]]; then
+            if [[ "$bind" == "settings" ]]; then
+                ynh_die "File '${short_setting}' can't be stored in settings"
+            fi
+            local bind_file="$(echo "$bind" | sed s@__INSTALL_DIR__@${install_dir:-}@ | sed s/__APP__/$app/)"
+            if [[ "${!short_setting}" == "" ]]; then
+                ynh_backup_if_checksum_is_different "$bind_file"
+                ynh_safe_rm "$bind_file"
+                ynh_delete_file_checksum "$bind_file"
+                ynh_print_info "File '$bind_file' removed"
+            else
+                ynh_backup_if_checksum_is_different "$bind_file"
+                if [[ "${!short_setting}" != "$bind_file" ]]; then
+                    cp "${!short_setting}" "$bind_file"
+                fi
+                if _ynh_file_checksum_exists "$bind_file"
+                then
+                    ynh_store_file_checksum "$bind_file"
+                fi
+                ynh_print_info "File '$bind_file' overwritten with ${!short_setting}"
+            fi
+
+        # Save value in app settings
+        elif [[ "$bind" == "settings" ]]; then
+            ynh_app_setting_set --key=$short_setting --value="${!short_setting}"
+            ynh_print_info "Configuration key '$short_setting' edited in app settings"
+
+        # Save multiline text in a file
+        elif [[ "$type" == "text" ]]; then
+            if [[ "$bind" == *":"* ]]; then
+                ynh_die "For technical reasons, multiline text '${short_setting}' can't be stored automatically  in a variable file, you have to create custom getter/setter"
+            fi
+            local bind_file="$(echo "$bind" | sed s@__INSTALL_DIR__@${install_dir:-}@ | sed s/__APP__/$app/)"
+            ynh_backup_if_checksum_is_different "$bind_file"
+            echo "${!short_setting}" >"$bind_file"
+            if _ynh_file_checksum_exists "$bind_file"
+            then
+                ynh_store_file_checksum "$bind_file"
+            fi
+            ynh_print_info "File '$bind_file' overwritten with the content provided in question '${short_setting}'"
+
+        # Set value into a kind of key/value file
+        else
+            local bind_after=""
+            local bind_key_="$(echo "$bind" | cut -d: -f1)"
+            if [[ "$bind_key_" == *">"* ]]; then
+                bind_after="$(echo "${bind_key_}" | cut -d'>' -f1)"
+                bind_key_="$(echo "${bind_key_}" | cut -d'>' -f2)"
+            fi
+            bind_key_=${bind_key_:-$short_setting}
+            local bind_file="$(echo "$bind" | cut -d: -f2 | sed s@__INSTALL_DIR__@${install_dir:-}@ | sed s/__APP__/$app/)"
+
+            ynh_backup_if_checksum_is_different "$bind_file"
+            ynh_write_var_in_file --file="${bind_file}" --key="${bind_key_}" --value="${!short_setting}" --after="${bind_after}"
+            if _ynh_file_checksum_exists "$bind_file"
+            then
+                ynh_store_file_checksum "$bind_file"
+            fi
+
+            # We stored the info in settings in order to be able to upgrade the app
+            ynh_app_setting_set --key=$short_setting --value="${!short_setting}"
+            ynh_print_info "Configuration key '$bind_key_' edited into $bind_file"
+
+        fi
+    fi
+}
+_ynh_app_config_get() {
+    # From settings
+    local lines
+    lines=$(
+        python3 <<EOL
+import toml
+from collections import OrderedDict
+with open("../config_panel.toml", "r") as f:
+    file_content = f.read()
+loaded_toml = toml.loads(file_content, _dict=OrderedDict)
+
+for panel_name, panel in loaded_toml.items():
+    if not isinstance(panel, dict): continue
+    bind_panel = panel.get('bind')
+    for section_name, section in panel.items():
+        if not isinstance(section, dict): continue
+        bind_section = section.get('bind')
+        if not bind_section:
+            bind_section = bind_panel
+        elif bind_section[-1] == ":" and bind_panel and ":" in bind_panel:
+            regex, bind_panel_file = bind_panel.split(":")
+            if ">" in bind_section:
+                bind_section = bind_section + bind_panel_file
+            else:
+                bind_section = regex + bind_section + bind_panel_file
+
+        for name, param in section.items():
+            if not isinstance(param, dict):
+                continue
+
+            bind = param.get('bind')
+
+            if not bind:
+                if bind_section:
+                    bind = bind_section
+                else:
+                    bind = 'settings'
+            elif bind[-1] == ":" and bind_section and ":" in bind_section:
+                regex, bind_file = bind_section.split(":")
+                if ">" in bind:
+                    bind = bind + bind_file
+                else:
+                    bind = regex + bind + bind_file
+            if bind == "settings" and param.get('type', 'string') == 'file':
+                bind = 'null'
+
+            print('|'.join([
+                name,
+                param.get('type', 'string'),
+                bind
+                ]))
+EOL
+    )
+    for line in $lines; do
+        # Split line into short_setting, type and bind
+        IFS='|' read short_setting type bind <<<"$line"
+        binds[${short_setting}]="$bind"
+        types[${short_setting}]="$type"
+        file_hash[${short_setting}]=""
+        formats[${short_setting}]=""
+        ynh_app_config_get_one $short_setting $type $bind
+    done
+
+}
+
+_ynh_app_config_apply() {
+    for short_setting in "${!old[@]}"; do
+        ynh_app_config_apply_one $short_setting
+    done
+}
+
+_ynh_app_config_show() {
+    for short_setting in "${!old[@]}"; do
+        if [[ "${old[$short_setting]}" != YNH_NULL ]]; then
+            if [[ "${formats[$short_setting]}" == "yaml" ]]; then
+                ynh_return "${short_setting}:"
+                ynh_return "$(echo "${old[$short_setting]}" | sed 's/^/  /g')"
+            else
+                ynh_return "${short_setting}: '$(echo "${old[$short_setting]}" | sed "s/'/''/g" | sed ':a;N;$!ba;s/\n/\n\n/g')'"
+            fi
+        fi
+    done
+}
+
+_ynh_app_config_validate() {
+    # Change detection
+    ynh_script_progression "Checking what changed in the new configuration..."
+    local nothing_changed=true
+    local changes_validated=true
+    for short_setting in "${!old[@]}"; do
+        changed[$short_setting]=false
+        if [ -z ${!short_setting+x} ]; then
+            # Assign the var with the old value in order to allows multiple
+            # args validation
+            declare -g "$short_setting"="${old[$short_setting]}"
+            continue
+        fi
+        if [ ! -z "${file_hash[${short_setting}]}" ]; then
+            file_hash[old__$short_setting]=""
+            file_hash[new__$short_setting]=""
+            if [ -f "${old[$short_setting]}" ]; then
+                file_hash[old__$short_setting]=$(sha256sum "${old[$short_setting]}" | cut -d' ' -f1)
+                if [ -z "${!short_setting}" ]; then
+                    changed[$short_setting]=true
+                    nothing_changed=false
+                fi
+            fi
+            if [ -f "${!short_setting}" ]; then
+                file_hash[new__$short_setting]=$(sha256sum "${!short_setting}" | cut -d' ' -f1)
+                if [[ "${file_hash[old__$short_setting]}" != "${file_hash[new__$short_setting]}" ]]; then
+                    changed[$short_setting]=true
+                    nothing_changed=false
+                fi
+            fi
+        else
+            if [[ "${!short_setting}" != "${old[$short_setting]}" ]]; then
+                changed[$short_setting]=true
+                nothing_changed=false
+            fi
+        fi
+    done
+    if [[ "$nothing_changed" == "true" ]]; then
+        ynh_print_info "Nothing has changed"
+        exit 0
+    fi
+
+    # Run validation if something is changed
+    ynh_script_progression "Validating the new configuration..."
+
+    for short_setting in "${!old[@]}"; do
+        [[ "${changed[$short_setting]}" == "false" ]] && continue
+        local result=""
+        if type -t validate__$short_setting | grep -q '^function$' 2>/dev/null; then
+            result="$(validate__$short_setting)"
+        elif [[ "$bind" == *"("* ]] && type -t "validate__${bind%%(*}" 2>/dev/null | grep -q '^function$' 2>/dev/null; then
+            "validate__${bind%%(*}" $short_setting
+        fi
+        if [ -n "$result" ]; then
+            #
+            # Return a yaml such as:
+            #
+            # validation_errors:
+            #   some_key: "An error message"
+            #   some_other_key: "Another error message"
+            #
+            # We use changes_validated to know if this is
+            # the first validation error
+            if [[ "$changes_validated" == true ]]; then
+                ynh_return "validation_errors:"
+            fi
+            ynh_return "  ${short_setting}: \"$result\""
+            changes_validated=false
+        fi
+    done
+
+    # If validation failed, exit the script right now (instead of going into apply)
+    # Yunohost core will pick up the errors returned via ynh_return previously
+    if [[ "$changes_validated" == "false" ]]; then
+        exit 0
+    fi
+
+}
+
+ynh_app_config_get_one() {
+    _ynh_app_config_get_one $1 $2 $3
+}
+
+ynh_app_config_get() {
+    _ynh_app_config_get
+}
+
+ynh_app_config_show() {
+    _ynh_app_config_show
+}
+
+ynh_app_config_validate() {
+    _ynh_app_config_validate
+}
+
+ynh_app_config_apply_one() {
+    _ynh_app_config_apply_one $1
+}
+ynh_app_config_apply() {
+    _ynh_app_config_apply
+}
+
+ynh_app_action_run() {
+    local runner="run__$1"
+    # Get value from getter if exists
+    if type -t "$runner" 2>/dev/null | grep -q '^function$' 2>/dev/null; then
+        $runner
+        #ynh_return "result:"
+        #ynh_return "$(echo "${result}" | sed 's/^/  /g')"
+    else
+        ynh_die "No handler defined in app's script for action $1. If you are the maintainer of this app, you should define '$runner'"
+    fi
+}
+
+ynh_app_config_run() {
+    declare -Ag old=()
+    declare -Ag changed=()
+    declare -Ag file_hash=()
+    declare -Ag binds=()
+    declare -Ag types=()
+    declare -Ag formats=()
+
+    case $1 in
+    show)
+        ynh_app_config_get
+        ynh_app_config_show
+        ;;
+    apply)
+        max_progression=4
+        ynh_script_progression "Reading config panel description and current configuration..."
+        ynh_app_config_get
+
+        ynh_app_config_validate
+
+        ynh_script_progression "Applying the new configuration..."
+        ynh_app_config_apply
+        ynh_script_progression "Configuration of $app completed"
+        ;;
+    *)
+        ynh_app_action_run $1
+    esac
+}

helpers/helpers.v2.1.d/fail2ban

@@ -0,0 +1,126 @@
+#!/bin/bash
+
+# Create a dedicated fail2ban config (jail and filter conf files)
+#
+# usage 1: ynh_config_add_fail2ban --logpath=log_file --failregex=filter
+# | arg: -l, --logpath=   - Log file to be checked by fail2ban
+# | arg: -r, --failregex= - Failregex to be looked for by fail2ban
+#
+# usage 2: ynh_config_add_fail2ban
+# | arg: -t, --use_template - Use this helper in template mode
+#
+# This will use a template in `../conf/f2b_jail.conf` and `../conf/f2b_filter.conf`
+# See the documentation of `ynh_config_add` for a description of the template
+# format and how placeholders are replaced with actual variables.
+#
+# Generally your template will look like that by example (for synapse):
+# ```
+# f2b_jail.conf:
+#     [__APP__]
+#     enabled = true
+#     port = http,https
+#     filter = __APP__
+#     logpath = /var/log/__APP__/logfile.log
+#     maxretry = 5
+# ```
+# ```
+# f2b_filter.conf:
+#     [INCLUDES]
+#     before = common.conf
+#     [Definition]
+#
+#     # Part of regex definition (just used to make more easy to make the global regex)
+#     __synapse_start_line = .? \- synapse\..+ \-
+#
+#    # Regex definition.
+#    failregex = ^%(__synapse_start_line)s INFO \- POST\-(\d+)\- <HOST> \- \d+ \- Received request\: POST /_matrix/client/r0/login\??<SKIPLINES>%(__synapse_start_line)s INFO \- POST\-\1\- Got login request with identifier: \{u'type': u'm.id.user', u'user'\: u'(.+?)'\}, medium\: None, address: None, user\: u'\5'<SKIPLINES>%(__synapse_start_line)s WARNING \- \- (Attempted to login as @\5\:.+ but they do not exist|Failed password login for user @\5\:.+)$
+#
+#     ignoreregex =
+# ```
+#
+# -----------------------------------------------------------------------------
+#
+# Note about the "failregex" option:
+#
+# regex to match the password failure messages in the logfile. The host must be
+# matched by a group named "`host`". The tag "`<HOST>`" can be used for standard
+# IP/hostname matching and is only an alias for `(?:::f{4,6}:)?(?P<host>[\w\-.^_]+)`
+#
+# You can find some more explainations about how to make a regex here :
+# https://www.fail2ban.org/wiki/index.php/MANUAL_0_8#Filters
+#
+# To validate your regex you can test with this command:
+# ```
+# fail2ban-regex /var/log/YOUR_LOG_FILE_PATH /etc/fail2ban/filter.d/YOUR_APP.conf
+# ```
+#
+# Requires YunoHost version 4.1.0 or higher.
+ynh_config_add_fail2ban() {
+    # ============ Argument parsing =============
+    local -A args_array=([l]=logpath= [r]=failregex=)
+    local logpath
+    local failregex
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    # If failregex is provided, Build a config file on-the-fly using $logpath and $failregex
+    if [[ -n "${failregex:-}" ]]; then
+        test -n "$logpath" || ynh_die "ynh_config_add_fail2ban expects a logfile path as first argument and received nothing."
+
+        echo "
+[__APP__]
+enabled = true
+port = http,https
+filter = __APP__
+logpath = __LOGPATH__
+maxretry = 5
+" >"$YNH_APP_BASEDIR/conf/f2b_jail.conf"
+
+        echo "
+[INCLUDES]
+before = common.conf
+[Definition]
+failregex = __FAILREGEX__
+ignoreregex =
+" >"$YNH_APP_BASEDIR/conf/f2b_filter.conf"
+    fi
+
+    ynh_config_add --template="f2b_jail.conf" --destination="/etc/fail2ban/jail.d/$app.conf"
+    ynh_config_add --template="f2b_filter.conf" --destination="/etc/fail2ban/filter.d/$app.conf"
+
+    # if "$logpath" doesn't exist (as if using --use_template argument), assign
+    # "$logpath" using the one in the previously generated fail2ban conf file
+    if [ -z "${logpath:-}" ]; then
+        # the first sed deletes possibles spaces and the second one extract the path
+        logpath=$(grep "^logpath" "/etc/fail2ban/jail.d/$app.conf" | sed "s/ //g" | sed "s/logpath=//g")
+    fi
+
+    # Create the folder and logfile if they doesn't exist,
+    # as fail2ban require an existing logfile before configuration
+    mkdir -p "/var/log/$app"
+    if [ ! -f "$logpath" ]; then
+        touch "$logpath"
+    fi
+    # Make sure log folder's permissions are correct
+    chown -R "$app:$app" "/var/log/$app"
+    chmod -R u=rwX,g=rX,o= "/var/log/$app"
+
+    ynh_systemctl --service=fail2ban --action=reload --wait_until="(Started|Reloaded) Fail2Ban Service" --log_path=systemd
+
+    local fail2ban_error="$(journalctl --no-hostname --unit=fail2ban | tail --lines=50 | grep "WARNING.*$app.*")"
+    if [[ -n "$fail2ban_error" ]]; then
+        ynh_print_warn "Fail2ban failed to load the jail for $app"
+        ynh_print_warn "${fail2ban_error#*WARNING}"
+    fi
+}
+
+# Remove the dedicated fail2ban config (jail and filter conf files)
+#
+# usage: ynh_config_remove_fail2ban
+#
+# Requires YunoHost version 3.5.0 or higher.
+ynh_config_remove_fail2ban() {
+    ynh_safe_rm "/etc/fail2ban/jail.d/$app.conf"
+    ynh_safe_rm "/etc/fail2ban/filter.d/$app.conf"
+    ynh_systemctl --service=fail2ban --action=reload
+}

helpers/helpers.v2.1.d/getopts

@@ -0,0 +1,185 @@
+#!/bin/bash
+
+# Internal helper design to allow helpers to use getopts to manage their arguments
+#
+# [internal]
+#
+# example: function my_helper()
+# {
+#     local -A args_array=( [a]=arg1= [b]=arg2= [c]=arg3 )
+#     local arg1
+#     local arg2
+#     local arg3
+#     ynh_handle_getopts_args "$@"
+#
+#     [...]
+# }
+# my_helper --arg1 "val1" -b val2 -c
+#
+# usage: ynh_handle_getopts_args "$@"
+# | arg: $@    - Simply "$@" to tranfert all the positionnal arguments to the function
+#
+# This helper need an array, named "args_array" with all the arguments used by the helper
+# 	that want to use ynh_handle_getopts_args
+# Be carreful, this array has to be an associative array, as the following example:
+# local -A args_array=( [a]=arg1 [b]=arg2= [c]=arg3 )
+# Let's explain this array:
+# a, b and c are short options, -a, -b and -c
+# arg1, arg2 and arg3 are the long options associated to the previous short ones. --arg1, --arg2 and --arg3
+# For each option, a short and long version has to be defined.
+# Let's see something more significant
+# local -A args_array=( [u]=user [f]=finalpath= [d]=database )
+#
+# NB: Because we're using 'declare' without -g, the array will be declared as a local variable.
+#
+# Please keep in mind that the long option will be used as a variable to store the values for this option.
+# For the previous example, that means that $finalpath will be fill with the value given as argument for this option.
+#
+# Also, in the previous example, finalpath has a '=' at the end. That means this option need a value.
+# So, the helper has to be call with --finalpath /final/path, --finalpath=/final/path or -f /final/path, the variable $finalpath will get the value /final/path
+# If there's many values for an option, -f /final /path, the value will be separated by a ';' $finalpath=/final;/path
+# For an option without value, like --user in the example, the helper can be called only with --user or -u. $user will then get the value 1.
+#
+# To keep a retrocompatibility, a package can still call a helper, using getopts, with positional arguments.
+# The "legacy mode" will manage the positional arguments and fill the variable in the same order than they are given in $args_array.
+# e.g. for `my_helper "val1" val2`, arg1 will be filled with val1, and arg2 with val2.
+#
+# Requires YunoHost version 3.2.2 or higher.
+ynh_handle_getopts_args() {
+    # Manage arguments only if there's some provided
+    set +o xtrace # set +x
+    if [ $# -eq 0 ]; then
+        set -o xtrace # set -x
+        return
+    fi
+
+    # Store arguments in an array to keep each argument separated
+    local arguments=("$@")
+
+    # For each option in the array, reduce to short options for getopts (e.g. for [u]=user, --user will be -u)
+    # And built parameters string for getopts
+    # ${!args_array[@]} is the list of all option_flags in the array (An option_flag is 'u' in [u]=user, user is a value)
+    local getopts_parameters=""
+    local option_flag=""
+    for option_flag in "${!args_array[@]}"; do
+        # Concatenate each option_flags of the array to build the string of arguments for getopts
+        # Will looks like 'abcd' for -a -b -c -d
+        # If the value of an option_flag finish by =, it's an option with additionnal values. (e.g. --user bob or -u bob)
+        # Check the last character of the value associate to the option_flag
+        if [ "${args_array[$option_flag]: -1}" = "=" ]; then
+            # For an option with additionnal values, add a ':' after the letter for getopts.
+            getopts_parameters="${getopts_parameters}${option_flag}:"
+        else
+            getopts_parameters="${getopts_parameters}${option_flag}"
+        fi
+        # Check each argument given to the function
+        local arg=""
+        # ${#arguments[@]} is the size of the array
+        for arg in $(seq 0 $((${#arguments[@]} - 1))); do
+            # Escape options' values starting with -. Otherwise the - will be considered as another option.
+            arguments[arg]="${arguments[arg]//--${args_array[$option_flag]}-/--${args_array[$option_flag]}\\TOBEREMOVED\\-}"
+            # And replace long option (value of the option_flag) by the short option, the option_flag itself
+            # (e.g. for [u]=user, --user will be -u)
+            # Replace long option with = (match the beginning of the argument)
+            arguments[arg]="$(printf '%s\n' "${arguments[arg]}" | sed "s/^--${args_array[$option_flag]}/-${option_flag} /")"
+            # And long option without = (match the whole line)
+            arguments[arg]="$(printf '%s\n' "${arguments[arg]}" | sed "s/^--${args_array[$option_flag]%=}$/-${option_flag} /")"
+        done
+    done
+
+    # Read and parse all the arguments
+    # Use a function here, to use standart arguments $@ and be able to use shift.
+    parse_arg() {
+        # Read all arguments, until no arguments are left
+        while [ $# -ne 0 ]; do
+            # Initialize the index of getopts
+            OPTIND=1
+            # Parse with getopts only if the argument begin by -, that means the argument is an option
+            # getopts will fill $parameter with the letter of the option it has read.
+            local parameter=""
+            getopts ":$getopts_parameters" parameter || true
+
+            if [ "$parameter" = "?" ]; then
+                ynh_die "Invalid argument: -${OPTARG:-}"
+            elif [ "$parameter" = ":" ]; then
+                ynh_die "-$OPTARG parameter requires an argument."
+            else
+                local shift_value=1
+                # Use the long option, corresponding to the short option read by getopts, as a variable
+                # (e.g. for [u]=user, 'user' will be used as a variable)
+                # Also, remove '=' at the end of the long option
+                # The variable name will be stored in 'option_var'
+                local option_var="${args_array[$parameter]%=}"
+                # If this option doesn't take values
+                # if there's a '=' at the end of the long option name, this option takes values
+                if [ "${args_array[$parameter]: -1}" != "=" ]; then
+                    # 'eval ${option_var}' will use the content of 'option_var'
+                    eval ${option_var}=1
+                else
+                    # Read all other arguments to find multiple value for this option.
+                    # Load args in a array
+                    local all_args=("$@")
+
+                    # If the first argument is longer than 2 characters,
+                    # There's a value attached to the option, in the same array cell
+                    if [ ${#all_args[0]} -gt 2 ]; then
+                        # Remove the option and the space, so keep only the value itself.
+                        all_args[0]="${all_args[0]#-${parameter} }"
+
+                        # At this point, if all_args[0] start with "-", then the argument is not well formed
+                        if [ "${all_args[0]:0:1}" == "-" ]; then
+                            ynh_die "Argument \"${all_args[0]}\" not valid! Did you use a single \"-\" instead of two?"
+                        fi
+                        # Reduce the value of shift, because the option has been removed manually
+                        shift_value=$((shift_value - 1))
+                    fi
+
+                    # Declare the content of option_var as a variable.
+                    eval ${option_var}=""
+                    # Then read the array value per value
+                    local i
+                    for i in $(seq 0 $((${#all_args[@]} - 1))); do
+                        # If this argument is an option, end here.
+                        if [ "${all_args[$i]:0:1}" == "-" ]; then
+                            # Ignore the first value of the array, which is the option itself
+                            if [ "$i" -ne 0 ]; then
+                                break
+                            fi
+                        else
+                            # Ignore empty parameters
+                            if [ -n "${all_args[$i]}" ]; then
+                                # Else, add this value to this option
+                                # Each value will be separated by ';'
+                                if [ -n "${!option_var}" ]; then
+                                    # If there's already another value for this option, add a ; before adding the new value
+                                    eval ${option_var}+="\;"
+                                fi
+
+                                # Remove the \ that escape - at beginning of values.
+                                all_args[i]="${all_args[i]//\\TOBEREMOVED\\/}"
+
+                                # For the record.
+                                # We're using eval here to get the content of the variable stored itself as simple text in $option_var...
+                                # Other ways to get that content would be to use either ${!option_var} or declare -g ${option_var}
+                                # But... ${!option_var} can't be used as left part of an assignation.
+                                # declare -g ${option_var} will create a local variable (despite -g !) and will not be available for the helper itself.
+                                # So... Stop fucking arguing each time that eval is evil... Go find an other working solution if you can find one!
+
+                                eval ${option_var}+='"${all_args[$i]}"'
+                            fi
+                            shift_value=$((shift_value + 1))
+                        fi
+                    done
+                fi
+            fi
+
+            # Shift the parameter and its argument(s)
+            shift $shift_value
+        done
+    }
+
+    # Call parse_arg and pass the modified list of args as an array of arguments.
+    parse_arg "${arguments[@]}"
+    
+    set -o xtrace # set -x
+}

helpers/helpers.v2.1.d/go

@@ -0,0 +1,197 @@
+#!/bin/bash
+
+ynh_go_try_bash_extension() {
+  if [ -x src/configure ]; then
+    src/configure && make -C src || {
+      ynh_print_info "Optional bash extension failed to build, but things will still work normally."
+    }
+  fi
+}
+
+goenv_install_dir="/opt/goenv"
+go_version_path="$goenv_install_dir/versions"
+# goenv_ROOT is the directory of goenv, it needs to be loaded as a environment variable.
+export GOENV_ROOT="$goenv_install_dir"
+
+_ynh_load_go_in_path_and_other_tweaks() {
+
+    # Get the absolute path of this version of go
+    local go_path="$go_version_path/$app/bin"
+
+    # Load the path of this version of go in $PATH
+    if [[ :$PATH: != *":$go_path"* ]]; then
+        PATH="$go_path:$PATH"
+    fi
+
+    # Export PATH such that it's available through sudo -E / ynh_exec_as $app
+    export PATH
+
+    # This is in full lowercase such that it gets replaced in templates
+    path_with_go="$PATH"
+    PATH_with_go="$PATH"
+
+    # Sets the local application-specific go version
+    pushd ${install_dir}
+        $goenv_install_dir/bin/goenv local $go_version
+    popd
+}
+
+# Install a specific version of Go using goenv
+#
+# The installed version is defined by $nodejs_version which should be defined as global prior to calling this helper
+#
+# This helper creates a /etc/profile.d/goenv.sh that configures PATH environment for goenv
+# for every LOGIN user, hence your user must have a defined shell (as opposed to /usr/sbin/nologin)
+#
+# Don't forget to execute go-dependent command in a login environment
+# (e.g. sudo --login option)
+# When not possible (e.g. in systemd service definition), please use direct path
+# to goenv shims (e.g. $goenv_ROOT/shims/bundle)
+#
+# usage: ynh_go_install
+#
+# Requires YunoHost version 3.2.2 or higher.
+ynh_go_install () {
+
+    [[ -n "${go_version:-}" ]] || ynh_die "\$go_version should be defined prior to calling ynh_go_install"
+
+    # Load goenv path in PATH
+    local CLEAR_PATH="$goenv_install_dir/bin:$PATH"
+
+    # Remove /usr/local/bin in PATH in case of Go prior installation
+    PATH=$(echo $CLEAR_PATH | sed 's@/usr/local/bin:@@')
+
+    # Move an existing Go binary, to avoid to block goenv
+    test -x /usr/bin/go && mv /usr/bin/go /usr/bin/go_goenv
+
+    # Install or update goenv
+    mkdir -p $goenv_install_dir
+    pushd "$goenv_install_dir"
+        if ! [ -x "$goenv_install_dir/bin/goenv" ]; then
+            ynh_print_info "Downloading goenv..."
+            git init -q
+            git remote add origin https://github.com/syndbg/goenv.git 
+        else
+            ynh_print_info "Updating goenv..."
+        fi
+        git fetch -q --tags --prune origin
+        local git_latest_tag=$(git describe --tags "$(git rev-list --tags --max-count=1)")
+        git checkout -q "$git_latest_tag"
+        ynh_go_try_bash_extension
+        goenv=$goenv_install_dir/bin/goenv
+    popd
+
+    # Install or update xxenv-latest
+    mkdir -p "$goenv_install_dir/plugins/xxenv-latest"
+    pushd "$goenv_install_dir/plugins/xxenv-latest"
+        if ! [ -x "$goenv_install_dir/plugins/xxenv-latest/bin/goenv-latest" ]; then
+            ynh_print_info "Downloading xxenv-latest..."
+            git init -q
+            git remote add origin https://github.com/momo-lab/xxenv-latest.git 
+        else
+            ynh_print_info "Updating xxenv-latest..."
+        fi
+        git fetch -q --tags --prune origin
+        local git_latest_tag=$(git describe --tags "$(git rev-list --tags --max-count=1)")
+        git checkout -q "$git_latest_tag"
+    popd
+
+    # Enable caching
+    mkdir -p "${goenv_install_dir}/cache"
+
+    # Create shims directory if needed
+    mkdir -p "${goenv_install_dir}/shims"
+
+    # Restore /usr/local/bin in PATH
+    PATH=$CLEAR_PATH
+
+    # And replace the old Go binary
+    test -x /usr/bin/go_goenv && mv /usr/bin/go_goenv /usr/bin/go
+
+    # Install the requested version of Go
+    local final_go_version=$(goenv latest --print "$go_version")
+    ynh_print_info "Installation of Go-$final_go_version"
+    goenv install --quiet --skip-existing "$final_go_version" 2>&1
+
+    # Store go_version into the config of this app
+    ynh_app_setting_set --app="$app" --key="go_version" --value="$final_go_version"
+    go_version=$final_go_version
+
+    # Cleanup Go versions
+    _ynh_go_cleanup
+
+    # Set environment for Go users
+    echo  "#goenv
+export GOENV_ROOT=$goenv_install_dir
+export PATH=\"$goenv_install_dir/bin:$PATH\"
+eval \"\$(goenv init -)\"
+#goenv" > /etc/profile.d/goenv.sh
+
+    # Load the environment
+    eval "$(goenv init -)"
+
+    _ynh_load_go_in_path_and_other_tweaks
+}
+
+# Remove the version of Go used by the app.
+#
+# This helper will also cleanup Go versions
+#
+# usage: ynh_go_remove
+ynh_go_remove () {
+    local go_version=$(ynh_app_setting_get --key="go_version")
+
+    # Load goenv path in PATH
+    local CLEAR_PATH="$goenv_install_dir/bin:$PATH"
+
+    # Remove /usr/local/bin in PATH in case of Go prior installation
+    PATH=$(echo $CLEAR_PATH | sed 's@/usr/local/bin:@@')
+
+    # Remove the line for this app
+    ynh_app_setting_delete --key="go_version"
+
+    # Cleanup Go versions
+    _ynh_go_cleanup
+}
+
+# Remove no more needed versions of Go used by the app.
+#
+# This helper will check what Go version are no more required,
+# and uninstall them
+# If no app uses Go, goenv will be also removed.
+#
+# usage: _ynh_go_cleanup
+_ynh_go_cleanup () {
+
+    # List required Go versions
+    local installed_apps=$(yunohost app list --output-as json --quiet | jq -r .apps[].id)
+    local required_go_versions=""
+    for installed_app in $installed_apps
+    do
+        local installed_app_go_version=$(ynh_app_setting_get --app=$installed_app --key="go_version")
+        if [[ $installed_app_go_version ]]
+        then
+            required_go_versions="${installed_app_go_version}\n${required_go_versions}"
+        fi
+    done
+
+    # Remove no more needed Go versions
+    local installed_go_versions=$(goenv versions --bare --skip-aliases | grep -Ev '/')
+    for installed_go_version in $installed_go_versions
+    do
+        if ! `echo ${required_go_versions} | grep "${installed_go_version}" 1>/dev/null 2>&1`
+        then
+            ynh_print_info "Removing of Go-$installed_go_version"
+            $goenv_install_dir/bin/goenv uninstall --force "$installed_go_version"
+        fi
+    done
+
+    # If none Go version is required
+    if [[ ! $required_go_versions ]]
+    then
+        # Remove goenv environment configuration
+        ynh_print_info "Removing of goenv"
+        ynh_safe_rm "$goenv_install_dir"
+        ynh_safe_rm "/etc/profile.d/goenv.sh"
+    fi
+}

helpers/helpers.v2.1.d/logging

@@ -0,0 +1,118 @@
+#!/bin/bash
+
+# Print a message to stderr and terminate the current script
+#
+# usage: ynh_die "Some message"
+ynh_die() {
+    echo "$1" 1>&2
+    exit 1
+}
+
+# Print an "INFO" message
+#
+# usage: ynh_print_info "Some message"
+ynh_print_info() {
+    echo "$1" >&$YNH_STDINFO
+}
+
+# Print a warning on stderr
+#
+# usage: ynh_print_warn "Some message"
+ynh_print_warn() {
+    echo "$1" >&2
+}
+
+# Execute a command and redirect stderr to stdout
+#
+# usage: ynh_hide_warnings your command and args
+# | arg: command - command to execute
+#
+ynh_hide_warnings() {
+    # Note that "$@" is used and not $@, c.f. https://unix.stackexchange.com/a/129077
+    "$@" 2>&1
+}
+
+# Execute a command and redirect stderr in /dev/null. Print stderr on error.
+#
+# usage: ynh_exec_and_print_stderr_only_if_error your command and args
+# | arg: command - command to execute
+#
+# Note that you should NOT quote the command but only prefix it with ynh_exec_and_print_stderr_only_if_error
+#
+# Requires YunoHost version 11.2 or higher.
+ynh_exec_and_print_stderr_only_if_error() {
+    logfile="$(mktemp)"
+    rc=0
+    # Note that "$@" is used and not $@, c.f. https://unix.stackexchange.com/a/129077
+    "$@" 2> "$logfile" || rc="$?"
+    if (( rc != 0 )); then
+        cat "$logfile" >&2
+        ynh_safe_rm "$logfile"
+        return "$rc"
+    fi
+}
+
+# Return data to the YunoHost core for later processing
+# (to be used by special hooks like app config panel and core diagnosis)
+#
+# usage: ynh_return somedata
+#
+# Requires YunoHost version 3.6.0 or higher.
+ynh_return() {
+    echo "$1" >>"$YNH_STDRETURN"
+}
+
+# Initial definitions for ynh_script_progression
+increment_progression=0
+previous_weight=0
+max_progression=-1
+# Set the scale of the progression bar
+# progress_string(0,1,2) should have the size of the scale.
+progress_scale=20
+progress_string2="####################"
+progress_string1="++++++++++++++++++++"
+progress_string0="...................."
+
+# Print a progress bar showing the progression of an app script
+#
+# usage: ynh_script_progression "Some message"
+#
+# Requires YunoHost version 3.5.0 or higher.
+ynh_script_progression() {
+    set +o xtrace # set +x
+
+    # Compute $max_progression (if we didn't already)
+    if [ "$max_progression" = -1 ]; then
+        # Get the number of occurrences of 'ynh_script_progression' in the script. Except those are commented.
+        local helper_calls=
+        max_progression="$(grep --count "^[^#]*ynh_script_progression" $0)"
+    fi
+
+    # Increment each execution of ynh_script_progression in this script by the weight of the previous call.
+    increment_progression=$(($increment_progression + $previous_weight))
+    # Store the weight of the current call in $previous_weight for next call
+    previous_weight=1
+
+    # Reduce $increment_progression to the size of the scale
+    local effective_progression=$(($increment_progression * $progress_scale / $max_progression))
+
+    # If last is specified, fill immediately the progression_bar
+
+    # Build $progression_bar from progress_string(0,1,2) according to $effective_progression and the weight of the current task
+    # expected_progression is the progression expected after the current task
+    local expected_progression="$((($increment_progression + 1) * $progress_scale / $max_progression - $effective_progression))"
+
+    # Hack for the "--last" message
+    if grep -qw 'completed' <<< "$1";
+    then
+         effective_progression=$progress_scale
+         expected_progression=0
+    fi
+    # left_progression is the progression not yet done
+    local left_progression="$(($progress_scale - $effective_progression - $expected_progression))"
+    # Build the progression bar with $effective_progression, work done, $expected_progression, current work and $left_progression, work to be done.
+    local progression_bar="${progress_string2:0:$effective_progression}${progress_string1:0:$expected_progression}${progress_string0:0:$left_progression}"
+
+    echo "[$progression_bar] > ${1}" >&$YNH_STDINFO
+    set -o xtrace # set -x
+}

helpers/helpers.v2.1.d/logrotate

@@ -0,0 +1,77 @@
+#!/bin/bash
+
+FIRST_CALL_TO_LOGROTATE="true"
+
+# Add a logrotate configuration to manage log files / log directory
+#
+# usage: ynh_config_add_logrotate [/path/to/log/file/or/folder]
+#
+# If not argument is provided, `/var/log/$app/*.log` is used as default.
+#
+# The configuration is autogenerated by YunoHost
+# (ie it doesnt come from a specific app template like nginx or systemd conf)
+#
+# Requires YunoHost version 2.6.4 or higher.
+ynh_config_add_logrotate() {
+
+    logfile="$1"
+
+    set -o noglob
+    if [[ -z "$logfile" ]]; then
+        logfile="/var/log/${app}/*.log"
+    elif [[ "${logfile##*.}" != "log" ]] && [[ "${logfile##*.}" != "txt" ]]; then
+        logfile="$logfile/*.log"
+    fi
+    set +o noglob
+
+    for stuff in $logfile
+    do
+        mkdir --parents $(dirname "$stuff")
+        # Make sure the permissions of the parent dir are correct (otherwise the config file could be ignored and the corresponding logs never rotated)
+        chmod 750 $(dirname "$stuff")
+    done
+
+    local tempconf="$(mktemp)"
+    cat << EOF >$tempconf
+$logfile {
+    # Rotate if the logfile exceeds 100Mo
+    size 100M
+    # Keep 12 old log maximum
+    rotate 12
+    # Compress the logs with gzip
+    compress
+    # Compress the log at the next cycle. So keep always 2 non compressed logs
+    delaycompress
+    # Copy and truncate the log to allow to continue write on it. Instead of moving the log.
+    copytruncate
+    # Do not trigger an error if the log is missing
+    missingok
+    # Do not rotate if the log is empty
+    notifempty
+    # Keep old logs in the same dir
+    noolddir
+}
+EOF
+
+    if [[ "$FIRST_CALL_TO_LOGROTATE" == "true" ]]
+    then
+        cat $tempconf > /etc/logrotate.d/$app
+    else
+        cat $tempconf >> /etc/logrotate.d/$app
+    fi
+
+    FIRST_CALL_TO_LOGROTATE="false"
+
+    chmod 644 "/etc/logrotate.d/$app"
+}
+
+# Remove the app's logrotate config.
+#
+# usage: ynh_remove_logrotate
+#
+# Requires YunoHost version 2.6.4 or higher.
+ynh_config_remove_logrotate() {
+    if [ -e "/etc/logrotate.d/$app" ]; then
+        rm "/etc/logrotate.d/$app"
+    fi
+}

helpers/helpers.v2.1.d/mongodb

@@ -0,0 +1,271 @@
+#!/bin/bash
+
+# Execute a mongo command
+#
+# example: ynh_mongo_exec --command='db.getMongo().getDBNames().indexOf("wekan")'
+# example: ynh_mongo_exec --command="db.getMongo().getDBNames().indexOf(\"wekan\")"
+#
+# usage: ynh_mongo_exec [--database=database] --command="command"
+# | arg: -d, --database=    - The database to connect to
+# | arg: -c, --command=     - The command to evaluate
+#
+#
+ynh_mongo_exec() {
+    # ============ Argument parsing =============
+    local -A args_array=( [d]=database= [c]=command= )
+    local database
+    local command
+    ynh_handle_getopts_args "$@"
+    database="${database:-}"
+    # ===========================================
+
+    if [ -n "$database" ]
+    then
+        mongosh --quiet <<EOF
+use $database
+${command}
+quit()
+EOF
+    else
+        mongosh --quiet --eval="$command"
+    fi
+}
+
+# Drop a database
+#
+# [internal]
+#
+# If you intend to drop the database *and* the associated user,
+# consider using ynh_mongo_remove_db instead.
+#
+# usage: ynh_mongo_drop_db --database=database
+# | arg: -d, --database=    - The database name to drop
+#
+#
+ynh_mongo_drop_db() {
+    # ============ Argument parsing =============
+    local -A args_array=( [d]=database= )
+    local database
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    ynh_mongo_exec --database="$database" --command='db.runCommand({dropDatabase: 1})'
+}
+
+# Dump a database
+#
+# example: ynh_mongo_dump_db --database=wekan > ./dump.bson
+#
+# usage: ynh_mongo_dump_db --database=database
+# | arg: -d, --database=    - The database name to dump
+# | ret: the mongodump output
+#
+#
+ynh_mongo_dump_db() {
+    # ============ Argument parsing =============
+    local -A args_array=( [d]=database= )
+    local database
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    mongodump --quiet --db="$database" --archive
+}
+
+# Create a user
+#
+# [internal]
+#
+# usage: ynh_mongo_create_user --db_user=user --db_pwd=pwd --db_name=name
+# | arg: -u, --db_user=        - The user name to create
+# | arg: -p, --db_pwd=        - The password to identify user by
+# | arg: -n, --db_name=        - Name of the database to grant privilegies
+#
+#
+ynh_mongo_create_user() {
+    # ============ Argument parsing =============
+    local -A args_array=( [u]=db_user= [n]=db_name= [p]=db_pwd= )
+    local db_user
+    local db_name
+    local db_pwd
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    # Create the user and set the user as admin of the db
+    ynh_mongo_exec --database="$db_name" --command='db.createUser( { user: "'${db_user}'", pwd: "'${db_pwd}'", roles: [ { role: "readWrite", db: "'${db_name}'" } ] } );'
+
+    # Add clustermonitoring rights
+    ynh_mongo_exec --database="$db_name" --command='db.grantRolesToUser("'${db_user}'",[{ role: "clusterMonitor", db: "admin" }]);'
+}
+
+# Check if a mongo database exists
+#
+# usage: ynh_mongo_database_exists --database=database
+# | arg: -d, --database=        - The database for which to check existence
+# | exit: Return 1 if the database doesn't exist, 0 otherwise
+#
+#
+ynh_mongo_database_exists() {
+    # ============ Argument parsing =============
+    local -A args_array=([d]=database=)
+    local database
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    if [ $(ynh_mongo_exec --command='db.getMongo().getDBNames().indexOf("'${database}'")') -lt 0 ]
+    then
+        return 1
+    else
+        return 0
+    fi
+}
+
+# Restore a database
+#
+# example: ynh_mongo_restore_db --database=wekan < ./dump.bson
+#
+# usage: ynh_mongo_restore_db --database=database
+# | arg: -d, --database=    - The database name to restore
+#
+#
+ynh_mongo_restore_db() {
+    # ============ Argument parsing =============
+    local -A args_array=( [d]=database= )
+    local database
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    mongorestore --quiet --db="$database" --archive
+}
+
+# Drop a user
+#
+# [internal]
+#
+# usage: ynh_mongo_drop_user --db_user=user --db_name=name
+# | arg: -u, --db_user=        - The user to drop
+# | arg: -n, --db_name=        - Name of the database
+#
+#
+ynh_mongo_drop_user() {
+    # ============ Argument parsing =============
+    local -A args_array=( [u]=db_user= [n]=db_name= )
+    local db_user
+    local db_name
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    ynh_mongo_exec --database="$db_name" --command='db.dropUser("'$db_user'", {w: "majority", wtimeout: 5000})'
+}
+
+# Create a database, an user and its password. Then store the password in the app's config
+#
+# usage: ynh_mongo_setup_db --db_user=user --db_name=name [--db_pwd=pwd]
+# | arg: -u, --db_user=        - Owner of the database
+# | arg: -n, --db_name=        - Name of the database
+# | arg: -p, --db_pwd=        - Password of the database. If not provided, a password will be generated
+#
+# After executing this helper, the password of the created database will be available in $db_pwd
+# It will also be stored as "mongopwd" into the app settings.
+#
+#
+ynh_mongo_setup_db() {
+    # ============ Argument parsing =============
+    local -A args_array=( [u]=db_user= [n]=db_name= [p]=db_pwd= )
+    local db_user
+    local db_name
+    db_pwd=""
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    local new_db_pwd=$(ynh_string_random) # Generate a random password
+    # If $db_pwd is not provided, use new_db_pwd instead for db_pwd
+    db_pwd="${db_pwd:-$new_db_pwd}"
+
+    # Create the user and grant access to the database
+    ynh_mongo_create_user --db_user="$db_user" --db_pwd="$db_pwd" --db_name="$db_name"
+
+    # Store the password in the app's config
+    ynh_app_setting_set --key=db_pwd --value=$db_pwd
+}
+
+# Remove a database if it exists, and the associated user
+#
+# usage: ynh_mongo_remove_db --db_user=user --db_name=name
+# | arg: -u, --db_user=        - Owner of the database
+# | arg: -n, --db_name=        - Name of the database
+#
+#
+ynh_mongo_remove_db() {
+    # ============ Argument parsing =============
+    local -A args_array=( [u]=db_user= [n]=db_name= )
+    local db_user
+    local db_name
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    if ynh_mongo_database_exists --database=$db_name; then  # Check if the database exists
+        ynh_mongo_drop_db --database=$db_name  # Remove the database
+    else
+        ynh_print_warn "Database $db_name not found"
+    fi
+
+    # Remove mongo user if it exists
+    ynh_mongo_drop_user --db_user=$db_user --db_name=$db_name
+}
+
+# Install MongoDB and integrate MongoDB service in YunoHost
+#
+# The installed version is defined by $mongo_version which should be defined as global prior to calling this helper
+#
+# usage: ynh_install_mongo
+#
+ynh_install_mongo() {
+
+    [[ -n "${mongo_version:-}" ]] || ynh_die "\$mongo_version should be defined prior to calling ynh_install_mongo"
+
+    ynh_print_info "Installing MongoDB Community Edition ..."
+    local mongo_debian_release=$YNH_DEBIAN_VERSION
+
+    if [[ $(cat /proc/cpuinfo) != *"avx"* && "$mongo_version" != "4.4" ]]; then
+        ynh_print_warn "Installing Mongo 4.4 as $mongo_version is not compatible with your cpu (see https://docs.mongodb.com/manual/administration/production-notes/#x86_64)."
+        mongo_version="4.4"
+    fi
+    if [[ "$mongo_version" == "4.4" ]]; then
+        ynh_print_warn "Switched to buster install as Mongo 4.4 is not compatible with $mongo_debian_release."
+        mongo_debian_release=buster
+    fi
+
+    ynh_install_extra_app_dependencies --repo="deb http://repo.mongodb.org/apt/debian $mongo_debian_release/mongodb-org/$mongo_version main" --package="mongodb-org mongodb-org-server mongodb-org-tools mongodb-mongosh" --key="https://www.mongodb.org/static/pgp/server-$mongo_version.asc"
+    mongodb_servicename=mongod
+
+    # Make sure MongoDB is started and enabled
+    systemctl enable $mongodb_servicename --quiet
+    systemctl daemon-reload --quiet
+    ynh_systemctl --service=$mongodb_servicename --action=restart --wait_until="aiting for connections" --log_path="/var/log/mongodb/$mongodb_servicename.log"
+
+    # Integrate MongoDB service in YunoHost
+    yunohost service add $mongodb_servicename --description="MongoDB daemon" --log="/var/log/mongodb/$mongodb_servicename.log"
+
+    # Store mongo_version into the config of this app
+    ynh_app_setting_set --key=mongo_version --value=$mongo_version
+}
+
+# Remove MongoDB
+# Only remove the MongoDB service integration in YunoHost for now
+# if MongoDB package as been removed
+#
+# usage: ynh_remove_mongo
+#
+#
+ynh_remove_mongo() {
+    # Only remove the mongodb service if it is not installed.
+    if ! _ynh_apt_package_is_installed "mongodb*"
+    then
+        ynh_print_info "Removing MongoDB service..."
+        mongodb_servicename=mongod
+        # Remove the mongodb service
+        yunohost service remove $mongodb_servicename
+        ynh_safe_rm "/var/lib/mongodb"
+        ynh_safe_rm "/var/log/mongodb"
+    fi
+}

helpers/helpers.v2.1.d/multimedia

@@ -0,0 +1,102 @@
+#!/bin/bash
+
+readonly MEDIA_GROUP=multimedia
+readonly MEDIA_DIRECTORY=/home/yunohost.multimedia
+
+# Initialize the multimedia directory system
+#
+# usage: ynh_multimedia_build_main_dir
+#
+# Requires YunoHost version 4.2 or higher.
+ynh_multimedia_build_main_dir() {
+
+    ## Création du groupe multimedia
+    groupadd -f $MEDIA_GROUP
+
+    ## Création des dossiers génériques
+    mkdir -p "$MEDIA_DIRECTORY"
+    mkdir -p "$MEDIA_DIRECTORY/share"
+    mkdir -p "$MEDIA_DIRECTORY/share/Music"
+    mkdir -p "$MEDIA_DIRECTORY/share/Picture"
+    mkdir -p "$MEDIA_DIRECTORY/share/Video"
+    mkdir -p "$MEDIA_DIRECTORY/share/eBook"
+
+    ## Création des dossiers utilisateurs
+    for user in $(yunohost user list --output-as json | jq -r '.users | keys[]'); do
+        mkdir -p "$MEDIA_DIRECTORY/$user"
+        mkdir -p "$MEDIA_DIRECTORY/$user/Music"
+        mkdir -p "$MEDIA_DIRECTORY/$user/Picture"
+        mkdir -p "$MEDIA_DIRECTORY/$user/Video"
+        mkdir -p "$MEDIA_DIRECTORY/$user/eBook"
+        ln -sfn "$MEDIA_DIRECTORY/share" "$MEDIA_DIRECTORY/$user/Share"
+        # Création du lien symbolique dans le home de l'utilisateur.
+        #link will only be created if the home directory of the user exists and if it's located in '/home' folder
+        local user_home="$(getent passwd $user | cut -d: -f6 | grep '^/home/')"
+        if [[ -d "$user_home" ]]; then
+            ln -sfn "$MEDIA_DIRECTORY/$user" "$user_home/Multimedia"
+        fi
+        # Propriétaires des dossiers utilisateurs.
+        chown -R $user "$MEDIA_DIRECTORY/$user"
+    done
+    # Default yunohost hooks for post_user_create,delete will take care
+    # of creating/deleting corresponding multimedia folders when users
+    # are created/deleted in the future...
+
+    ## Application des droits étendus sur le dossier multimedia.
+    # Droit d'écriture pour le groupe et le groupe multimedia en acl et droit de lecture pour other:
+    setfacl -RnL -m g:$MEDIA_GROUP:rwX,g::rwX,o:r-X "$MEDIA_DIRECTORY" || true
+    # Application de la même règle que précédemment, mais par défaut pour les nouveaux fichiers.
+    setfacl -RnL -m d:g:$MEDIA_GROUP:rwX,g::rwX,o:r-X "$MEDIA_DIRECTORY" || true
+    # Réglage du masque par défaut. Qui garantie (en principe...) un droit maximal à rwx. Donc pas de restriction de droits par l'acl.
+    setfacl -RL -m m::rwx "$MEDIA_DIRECTORY" || true
+}
+
+# Add a directory in yunohost.multimedia
+#
+# usage: ynh_multimedia_addfolder --source_dir="source_dir" --dest_dir="dest_dir"
+#
+# | arg: -s, --source_dir= - Source directory - The real directory which contains your medias.
+# | arg: -d, --dest_dir= - Destination directory - The name and the place of the symbolic link, relative to "/home/yunohost.multimedia"
+#
+# This "directory" will be a symbolic link to a existing directory.
+#
+# Requires YunoHost version 4.2 or higher.
+ynh_multimedia_addfolder() {
+
+    # ============ Argument parsing =============
+    local -A args_array=([s]=source_dir= [d]=dest_dir=)
+    local source_dir
+    local dest_dir
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    # Ajout d'un lien symbolique vers le dossier à partager
+    ln -sfn "$source_dir" "$MEDIA_DIRECTORY/$dest_dir"
+
+    ## Application des droits étendus sur le dossier ajouté
+    # Droit d'écriture pour le groupe et le groupe multimedia en acl et droit de lecture pour other:
+    setfacl -RnL -m g:$MEDIA_GROUP:rwX,g::rwX,o:r-X "$source_dir"
+    # Application de la même règle que précédemment, mais par défaut pour les nouveaux fichiers.
+    setfacl -RnL -m d:g:$MEDIA_GROUP:rwX,g::rwX,o:r-X "$source_dir"
+    # Réglage du masque par défaut. Qui garantie (en principe...) un droit maximal à rwx. Donc pas de restriction de droits par l'acl.
+    setfacl -RL -m m::rwx "$source_dir"
+}
+
+# Allow an user to have an write authorisation in multimedia directories
+#
+# usage: ynh_multimedia_addaccess user_name
+#
+# | arg: -u, --user_name= - The name of the user which gain this access.
+#
+# Requires YunoHost version 4.2 or higher.
+ynh_multimedia_addaccess() {
+    
+    # ============ Argument parsing =============
+    local -A args_array=([u]=user_name=)
+    local user_name
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    groupadd -f multimedia
+    usermod -a -G multimedia $user_name
+}

helpers/helpers.v2.1.d/mysql

@@ -0,0 +1,114 @@
+#!/bin/bash
+
+# Run SQL instructions in a database ($db_name by default)
+#
+# usage: ynh_mysql_db_shell [database] <<< "instructions"
+# | arg: database=    - the database to connect to (by default, $db_name)
+#
+# examples:
+#    ynh_mysql_db_shell $db_name <<< "UPDATE ...;"
+#    ynh_mysql_db_shell < /path/to/file.sql
+#
+ynh_mysql_db_shell() {
+    local database=${1:-$db_name}
+    mysql -B $database
+}
+
+# Create a database and grant optionnaly privilegies to a user
+#
+# [internal]
+#
+# usage: ynh_mysql_create_db db [user [pwd]]
+# | arg: db - the database name to create
+# | arg: user - the user to grant privilegies
+# | arg: pwd - the password to identify user by
+#
+ynh_mysql_create_db() {
+    local db=$1
+
+    local sql="CREATE DATABASE ${db};"
+
+    # grant all privilegies to user
+    if [[ $# -gt 1 ]]; then
+        sql+=" GRANT ALL PRIVILEGES ON ${db}.* TO '${2}'@'localhost'"
+        if [[ -n ${3:-} ]]; then
+            sql+=" IDENTIFIED BY '${3}'"
+        fi
+        sql+=" WITH GRANT OPTION;"
+    fi
+
+    mysql -B <<< "$sql"
+}
+
+# Drop a database
+#
+# [internal]
+#
+# If you intend to drop the database *and* the associated user,
+# consider using ynh_mysql_remove_db instead.
+#
+# usage: ynh_mysql_drop_db db
+# | arg: db - the database name to drop
+#
+ynh_mysql_drop_db() {
+    mysql -B <<< "DROP DATABASE ${1};"
+}
+
+# Dump a database
+#
+# usage: ynh_mysql_dump_db database
+# | arg: -d, --database=    - the database name to dump (by default, $db_name)
+# | ret: The mysqldump output
+#
+# example: ynh_mysql_dump_db "roundcube" > ./dump.sql
+#
+ynh_mysql_dump_db() {
+    local database=${1:-$db_name}
+    mysqldump --single-transaction --skip-dump-date --routines "$database"
+}
+
+# Create a user
+#
+# [internal]
+#
+# usage: ynh_mysql_create_user user pwd [host]
+# | arg: user - the user name to create
+# | arg: pwd - the password to identify user by
+#
+ynh_mysql_create_user() {
+    mysql -B <<< "CREATE USER '${1}'@'localhost' IDENTIFIED BY '${2}';"
+}
+
+# Check if a mysql user exists
+#
+# [internal]
+#
+# usage: ynh_mysql_user_exists user
+# | arg: user=    - the user for which to check existence
+# | ret: 0 if the user exists, 1 otherwise.
+ynh_mysql_user_exists() {
+    local user=$1
+    [[ -n "$(mysql -B <<< "SELECT User from mysql.user WHERE User = '$user';")" ]]
+}
+
+# Check if a mysql database exists
+#
+# usage: ynh_mysql_database_exists database
+# | arg: database    - the database for which to check existence
+# | exit: Return 1 if the database doesn't exist, 0 otherwise
+#
+ynh_mysql_database_exists() {
+    local database=$1
+    mysqlshow | grep -q "^| $database "
+}
+
+# Drop a user
+#
+# [internal]
+#
+# usage: ynh_mysql_drop_user user
+# | arg: user - the user name to drop
+#
+ynh_mysql_drop_user() {
+    mysql -B <<< "DROP USER '${1}'@'localhost';"
+}

helpers/helpers.v2.1.d/nginx

@@ -0,0 +1,65 @@
+#!/bin/bash
+
+# Create a dedicated nginx config
+#
+# usage: ynh_config_add_nginx
+#
+# This will use a template in `../conf/nginx.conf`
+# See the documentation of `ynh_config_add` for a description of the template
+# format and how placeholders are replaced with actual variables.
+#
+# Additionally, ynh_config_add_nginx will replace:
+# - `#sub_path_only`      by empty string if `path` is not `'/'`
+# - `#root_path_only`     by empty string if `path`  *is*  `'/'`
+#
+# This allows to enable/disable specific behaviors dependenging on the install
+# location
+#
+# Requires YunoHost version 4.1.0 or higher.
+ynh_config_add_nginx() {
+
+    local finalnginxconf="/etc/nginx/conf.d/$domain.d/$app.conf"
+
+    ynh_config_add --template="nginx.conf" --destination="$finalnginxconf"
+
+    if [ "${path:-}" != "/" ]; then
+        ynh_replace --match="^#sub_path_only" --replace="" --file="$finalnginxconf"
+    else
+        ynh_replace --match="^#root_path_only" --replace="" --file="$finalnginxconf"
+    fi
+
+    ynh_store_file_checksum "$finalnginxconf"
+
+    ynh_systemctl --service=nginx --action=reload
+}
+
+# Remove the dedicated nginx config
+#
+# usage: ynh_config_remove_nginx
+#
+# Requires YunoHost version 2.7.2 or higher.
+ynh_config_remove_nginx() {
+    ynh_safe_rm "/etc/nginx/conf.d/$domain.d/$app.conf"
+    ynh_systemctl --service=nginx --action=reload
+}
+
+
+# Regen the nginx config in a change url context
+#
+# usage: ynh_config_change_url_nginx
+#
+# Requires YunoHost version 11.1.9 or higher.
+ynh_config_change_url_nginx() {
+
+    # Make a backup of the original NGINX config file if manually modified
+    # (nb: this is possibly different from the same instruction called by
+    # ynh_config_add inside ynh_config_add_nginx because the path may have 
+    # changed if we're changing the domain too...)
+    local old_nginx_conf_path=/etc/nginx/conf.d/$old_domain.d/$app.conf
+    ynh_backup_if_checksum_is_different "$old_nginx_conf_path"
+    ynh_delete_file_checksum "$old_nginx_conf_path"
+    ynh_safe_rm "$old_nginx_conf_path"
+
+    # Regen the nginx conf
+    ynh_config_add_nginx
+}

helpers/helpers.v2.1.d/nodejs

@@ -0,0 +1,127 @@
+#!/bin/bash
+
+n_install_dir="/opt/node_n"
+node_version_path="$n_install_dir/n/versions/node"
+# N_PREFIX is the directory of n, it needs to be loaded as a environment variable.
+export N_PREFIX="$n_install_dir"
+
+_ynh_load_nodejs_in_path_and_other_tweaks() {
+
+    # Get the absolute path of this version of node
+    local nodejs_path="$node_version_path/$nodejs_version/bin"
+
+    # Load the path of this version of node in $PATH
+    if [[ :$PATH: != *":$nodejs_path"* ]]; then
+        PATH="$nodejs_path:$PATH"
+    fi
+
+    # Export PATH such that it's available through sudo -E / ynh_exec_as $app
+    export PATH
+
+    # This is in full lowercase such that it gets replaced in templates
+    path_with_nodejs="$PATH"
+    PATH_with_nodejs="$PATH"
+
+    # Prevent yet another Node and Corepack madness, with Corepack wanting the user to confirm download of Yarn
+    export COREPACK_ENABLE_DOWNLOAD_PROMPT=0
+}
+
+# Install a specific version of nodejs, using 'n'
+#
+# The installed version is defined by $nodejs_version which should be defined as global prior to calling this helper
+#
+# usage: ynh_nodejs_install
+#
+# `n` (Node version management) uses the `PATH` variable to store the path of the version of node it is going to use.
+# That's how it changes the version
+#
+# Adds the appropriate, specific version of nodejs to the PATH variable (which
+# is also exported, to ease the use of ynh_exec_as_app). Also define variable
+# PATH_with_nodejs to be used in the systemd config
+# (Environment="PATH=__PATH_WITH_NODEJS__")
+#
+# Requires YunoHost version 2.7.12 or higher.
+ynh_nodejs_install() {
+    # Use n, https://github.com/tj/n to manage the nodejs versions
+
+    [[ -n "${nodejs_version:-}" ]] || ynh_die "\$nodejs_version should be defined prior to calling ynh_nodejs_install"
+
+    # Create $n_install_dir
+    mkdir --parents "$n_install_dir"
+
+    # Load n path in PATH
+    CLEAR_PATH="$n_install_dir/bin:$PATH"
+    # Remove /usr/local/bin in PATH in case of node prior installation
+    PATH=$(echo $CLEAR_PATH | sed 's@/usr/local/bin:@@')
+
+    # Move an existing node binary, to avoid to block n.
+    test -x /usr/bin/node && mv /usr/bin/node /usr/bin/node_n
+    test -x /usr/bin/npm && mv /usr/bin/npm /usr/bin/npm_n
+
+    # Install (or update if YunoHost vendor/ folder updated since last install) n
+    mkdir -p $n_install_dir/bin/
+    cp "$YNH_HELPERS_DIR/vendor/n/n" $n_install_dir/bin/n
+    # Tweak for n to understand it's installed in $N_PREFIX
+    ynh_replace --match="^N_PREFIX=\${N_PREFIX-.*}$" --replace="N_PREFIX=\${N_PREFIX-$N_PREFIX}" --file="$n_install_dir/bin/n"
+
+    # Restore /usr/local/bin in PATH
+    PATH=$CLEAR_PATH
+
+    # And replace the old node binary.
+    test -x /usr/bin/node_n && mv /usr/bin/node_n /usr/bin/node
+    test -x /usr/bin/npm_n && mv /usr/bin/npm_n /usr/bin/npm
+
+    # Install the requested version of nodejs
+    uname=$(uname --machine)
+    if [[ $uname =~ aarch64 || $uname =~ arm64 ]]; then
+        n $nodejs_version --arch=arm64
+    else
+        n $nodejs_version
+    fi
+
+    # Find the last "real" version for this major version of node.
+    real_nodejs_version=$(find $node_version_path/$nodejs_version* -maxdepth 0 | sort --version-sort | tail --lines=1)
+    real_nodejs_version=$(basename $real_nodejs_version)
+
+    # Create a symbolic link for this major version if the file doesn't already exist
+    if [ ! -e "$node_version_path/$nodejs_version" ]; then
+        ln --symbolic --force --no-target-directory $node_version_path/$real_nodejs_version $node_version_path/$nodejs_version
+    fi
+
+    # Store the ID of this app and the version of node requested for it
+    echo "$YNH_APP_INSTANCE_NAME:$nodejs_version" | tee --append "$n_install_dir/ynh_app_version"
+
+    # Store nodejs_version into the config of this app
+    ynh_app_setting_set --key=nodejs_version --value=$nodejs_version
+
+    _ynh_load_nodejs_in_path_and_other_tweaks
+}
+
+# Remove the version of node used by the app.
+#
+# usage: ynh_nodejs_remove
+#
+# This helper will check if another app uses the same version of node.
+# - If not, this version of node will be removed.
+# - If no other app uses node, n will be also removed.
+#
+# Requires YunoHost version 2.7.12 or higher.
+ynh_nodejs_remove() {
+
+    [[ -n "${nodejs_version:-}" ]] || ynh_die "\$nodejs_version should be defined prior to calling ynh_nodejs_remove"
+
+    # Remove the line for this app
+    sed --in-place "/$YNH_APP_INSTANCE_NAME:$nodejs_version/d" "$n_install_dir/ynh_app_version"
+
+    # If no other app uses this version of nodejs, remove it.
+    if ! grep --quiet "$nodejs_version" "$n_install_dir/ynh_app_version"; then
+        $n_install_dir/bin/n rm $nodejs_version
+    fi
+
+    # If no other app uses n, remove n
+    if [ ! -s "$n_install_dir/ynh_app_version" ]; then
+        ynh_safe_rm "$n_install_dir"
+        ynh_safe_rm "/usr/local/n"
+        sed --in-place "/N_PREFIX/d" /root/.bashrc
+    fi
+}

helpers/helpers.v2.1.d/permission

@@ -0,0 +1,331 @@
+#!/bin/bash
+
+# Create a new permission for the app
+#
+# Example 1: `ynh_permission_create --permission=admin --url=/admin --additional_urls=domain.tld/admin /superadmin --allowed=alice bob \
+#                                  --label="My app admin" --show_tile=true`
+#
+# This example will create a new permission permission with this following effect:
+# - A tile named "My app admin" in the SSO will be available for the users alice and bob. This tile will point to the relative url '/admin'.
+# - Only the user alice and bob will have the access to theses following url: /admin, domain.tld/admin, /superadmin
+#
+#
+# Example 2:
+#
+#     ynh_permission_create --permission=api --url=domain.tld/api --auth_header=false --allowed=visitors \
+#                                  --label="MyApp API" --protected=true
+#
+# This example will create a new protected permission. So the admin won't be able to add/remove the visitors group of this permission.
+# In case of an API with need to be always public it avoid that the admin break anything.
+# With this permission all client will be allowed to access to the url 'domain.tld/api'.
+# Note that in this case no tile will be show on the SSO.
+# Note that the auth_header parameter is to 'false'. So no authentication header will be passed to the application.
+# Generally the API is requested by an application and enabling the auth_header has no advantage and could bring some issues in some case.
+# So in this case it's better to disable this option for all API.
+#
+#
+# usage: ynh_permission_create --permission="permission" [--url="url"] [--additional_urls="second-url" [ "third-url" ]] [--auth_header=true|false]
+#                                                        [--allowed=group1 [ group2 ]] [--label="label"] [--show_tile=true|false]
+#                                                        [--protected=true|false]
+# | arg: -p, --permission=       - the name for the permission (by default a permission named "main" already exist)
+# | arg: -u, --url=              - (optional) URL for which access will be allowed/forbidden. Note that if 'show_tile' is enabled, this URL will be the URL of the tile.
+# | arg: -A, --additional_urls=  - (optional) List of additional URL for which access will be allowed/forbidden
+# | arg: -h, --auth_header=      - (optional) Define for the URL of this permission, if SSOwat pass the authentication header to the application. Default is true
+# | arg: -a, --allowed=          - (optional) A list of group/user to allow for the permission
+# | arg: -l, --label=            - (optional) Define a name for the permission. This label will be shown on the SSO and in the admin. Default is "APP_LABEL (permission name)".
+# | arg: -t, --show_tile=        - (optional) Define if a tile will be shown in the SSO. If yes the name of the tile will be the 'label' parameter. Defaults to false for the permission different than 'main'.
+# | arg: -P, --protected=        - (optional) Define if this permission is protected. If it is protected the administrator won't be able to add or remove the visitors group of this permission. Defaults to 'false'.
+#
+# [packagingv1]
+#
+# If provided, 'url' or 'additional_urls' is assumed to be relative to the app domain/path if they
+# start with '/'.  For example:
+#     /                             -> domain.tld/app
+#     /admin                        -> domain.tld/app/admin
+#     domain.tld/app/api            -> domain.tld/app/api
+#
+# 'url' or 'additional_urls' can be treated as a PCRE (not lua) regex if it starts with "re:".
+# For example:
+#     re:/api/[A-Z]*$               -> domain.tld/app/api/[A-Z]*$
+#     re:domain.tld/app/api/[A-Z]*$ -> domain.tld/app/api/[A-Z]*$
+#
+# Note that globally the parameter 'url' and 'additional_urls' are same. The only difference is:
+# - 'url' is only one url, 'additional_urls' can be a list of urls. There are no limitation of 'additional_urls'
+# - 'url' is used for the url of tile in the SSO (if enabled with the 'show_tile' parameter)
+#
+#
+# About the authentication header (auth_header parameter).
+# The SSO pass (by default) to the application theses following HTTP header (linked to the authenticated user) to the application:
+#        - "Auth-User": username
+#        - "Remote-User": username
+#        - "Email": user email
+#
+# Generally this feature is usefull to authenticate automatically the user in the application but in some case the application don't work with theses header and theses header need to be disabled to have the application to work correctly.
+# See https://github.com/YunoHost/issues/issues/1420 for more informations
+#
+#
+# Requires YunoHost version 3.7.0 or higher.
+ynh_permission_create() {
+    # ============ Argument parsing =============
+    local -A args_array=([p]=permission= [u]=url= [A]=additional_urls= [h]=auth_header= [a]=allowed= [l]=label= [t]=show_tile= [P]=protected=)
+    local permission
+    local url
+    local additional_urls
+    local auth_header
+    local allowed
+    local label
+    local show_tile
+    local protected
+    ynh_handle_getopts_args "$@"
+    url=${url:-}
+    additional_urls=${additional_urls:-}
+    auth_header=${auth_header:-}
+    allowed=${allowed:-}
+    label=${label:-}
+    show_tile=${show_tile:-}
+    protected=${protected:-}
+    # ===========================================
+
+    if [[ -n $url ]]; then
+        url=",url='$url'"
+    fi
+
+    if [[ -n $additional_urls ]]; then
+        # Convert a list from getopts to python list
+        # Note that getopts separate the args with ';'
+        # By example:
+        # --additional_urls /urlA /urlB
+        # will be:
+        # additional_urls=['/urlA', '/urlB']
+        additional_urls=",additional_urls=['${additional_urls//;/\',\'}']"
+    fi
+
+    if [[ -n $auth_header ]]; then
+        if [ $auth_header == "true" ]; then
+            auth_header=",auth_header=True"
+        else
+            auth_header=",auth_header=False"
+        fi
+    fi
+
+    if [[ -n $allowed ]]; then
+        # Convert a list from getopts to python list
+        # Note that getopts separate the args with ';'
+        # By example:
+        # --allowed alice bob
+        # will be:
+        # allowed=['alice', 'bob']
+        allowed=",allowed=['${allowed//;/\',\'}']"
+    fi
+
+    if [[ -n ${label:-} ]]; then
+        label=",label='$label'"
+    else
+        label=",label='$permission'"
+    fi
+
+    if [[ -n ${show_tile:-} ]]; then
+        if [ $show_tile == "true" ]; then
+            show_tile=",show_tile=True"
+        else
+            show_tile=",show_tile=False"
+        fi
+    fi
+
+    if [[ -n ${protected:-} ]]; then
+        if [ $protected == "true" ]; then
+            protected=",protected=True"
+        else
+            protected=",protected=False"
+        fi
+    fi
+
+    yunohost tools shell -c "from yunohost.permission import permission_create; permission_create('$app.$permission' $url $additional_urls $auth_header $allowed $label $show_tile $protected)"
+}
+
+# Remove a permission for the app (note that when the app is removed all permission is automatically removed)
+#
+# [packagingv1]
+#
+# example: ynh_permission_delete --permission=editors
+#
+# usage: ynh_permission_delete --permission="permission"
+# | arg: -p, --permission=      - the name for the permission (by default a permission named "main" is removed automatically when the app is removed)
+#
+# Requires YunoHost version 3.7.0 or higher.
+ynh_permission_delete() {
+    # ============ Argument parsing =============
+    local -A args_array=([p]=permission=)
+    local permission
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    yunohost tools shell -c "from yunohost.permission import permission_delete; permission_delete('$app.$permission')"
+}
+
+# Check if a permission exists
+#
+# [packagingv1]
+#
+# usage: ynh_permission_exists --permission=permission
+# | arg: -p, --permission=      - the permission to check
+# | exit: Return 1 if the permission doesn't exist, 0 otherwise
+#
+# Requires YunoHost version 3.7.0 or higher.
+ynh_permission_exists() {
+    # ============ Argument parsing =============
+    local -A args_array=([p]=permission=)
+    local permission
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    yunohost user permission list "$app" --output-as json --quiet \
+        | jq -e --arg perm "$app.$permission" '.permissions[$perm]' >/dev/null
+}
+
+# Redefine the url associated to a permission
+#
+# [packagingv1]
+#
+# usage: ynh_permission_url --permission "permission" [--url="url"] [--add_url="new-url" [ "other-new-url" ]] [--remove_url="old-url" [ "other-old-url" ]]
+#                                                     [--auth_header=true|false] [--clear_urls]
+# | arg: -p, --permission=   - the name for the permission (by default a permission named "main" is removed automatically when the app is removed)
+# | arg: -u, --url=          - (optional) URL for which access will be allowed/forbidden. Note that if you want to remove url you can pass an empty sting as arguments ("").
+# | arg: -a, --add_url=      - (optional) List of additional url to add for which access will be allowed/forbidden.
+# | arg: -r, --remove_url=   - (optional) List of additional url to remove for which access will be allowed/forbidden
+# | arg: -h, --auth_header=  - (optional) Define for the URL of this permission, if SSOwat pass the authentication header to the application
+# | arg: -c, --clear_urls    - (optional) Clean all urls (url and additional_urls)
+#
+# Requires YunoHost version 3.7.0 or higher.
+ynh_permission_url() {
+    # ============ Argument parsing =============
+    local -A args_array=([p]=permission= [u]=url= [a]=add_url= [r]=remove_url= [h]=auth_header= [c]=clear_urls)
+    local permission
+    local url
+    local add_url
+    local remove_url
+    local auth_header
+    local clear_urls
+    ynh_handle_getopts_args "$@"
+    url=${url:-}
+    add_url=${add_url:-}
+    remove_url=${remove_url:-}
+    auth_header=${auth_header:-}
+    clear_urls=${clear_urls:-}
+    # ===========================================
+
+    if [[ -n $url ]]; then
+        url=",url='$url'"
+    fi
+
+    if [[ -n $add_url ]]; then
+        # Convert a list from getopts to python list
+        # Note that getopts separate the args with ';'
+        # For example:
+        # --add_url /urlA /urlB
+        # will be:
+        # add_url=['/urlA', '/urlB']
+        add_url=",add_url=['${add_url//;/\',\'}']"
+    fi
+
+    if [[ -n $remove_url ]]; then
+        # Convert a list from getopts to python list
+        # Note that getopts separate the args with ';'
+        # For example:
+        # --remove_url /urlA /urlB
+        # will be:
+        # remove_url=['/urlA', '/urlB']
+        remove_url=",remove_url=['${remove_url//;/\',\'}']"
+    fi
+
+    if [[ -n $auth_header ]]; then
+        if [ $auth_header == "true" ]; then
+            auth_header=",auth_header=True"
+        else
+            auth_header=",auth_header=False"
+        fi
+    fi
+
+    if [[ -n $clear_urls ]] && [ $clear_urls -eq 1 ]; then
+        clear_urls=",clear_urls=True"
+    fi
+
+    yunohost tools shell -c "from yunohost.permission import permission_url; permission_url('$app.$permission' $url $add_url $remove_url $auth_header $clear_urls)"
+}
+
+# Update a permission for the app
+#
+# [packagingv1]
+#
+# usage: ynh_permission_update --permission "permission" [--add="group" ["group" ...]] [--remove="group" ["group" ...]]
+#
+# | arg: -p, --permission= - the name for the permission (by default a permission named "main" already exist)
+# | arg: -a, --add=        - the list of group or users to enable add to the permission
+# | arg: -r, --remove=     - the list of group or users to remove from the permission
+#
+# Requires YunoHost version 3.7.0 or higher.
+ynh_permission_update() {
+    # ============ Argument parsing =============
+    local -A args_array=([p]=permission= [a]=add= [r]=remove=)
+    local permission
+    local add
+    local remove
+    ynh_handle_getopts_args "$@"
+    add=${add:-}
+    remove=${remove:-}
+    # ===========================================
+
+    if [[ -n $add ]]; then
+        # Convert a list from getopts to python list
+        # Note that getopts separate the args with ';'
+        # For example:
+        # --add alice bob
+        # will be:
+        # add=['alice', 'bob']
+        add=",add=['${add//';'/"','"}']"
+    fi
+    if [[ -n $remove ]]; then
+        # Convert a list from getopts to python list
+        # Note that getopts separate the args with ';'
+        # For example:
+        # --remove alice bob
+        # will be:
+        # remove=['alice', 'bob']
+        remove=",remove=['${remove//';'/"','"}']"
+    fi
+
+    yunohost tools shell -c "from yunohost.permission import user_permission_update; user_permission_update('$app.$permission' $add $remove , force=True)"
+}
+
+# Check if a permission has an user
+#
+# example: ynh_permission_has_user --permission=main --user=visitors
+#
+# usage: ynh_permission_has_user --permission=permission --user=user
+# | arg: -p, --permission=  - the permission to check
+# | arg: -u, --user=        - the user seek in the permission
+# | exit: Return 1 if the permission doesn't have that user or doesn't exist, 0 otherwise
+#
+# Requires YunoHost version 3.7.1 or higher.
+ynh_permission_has_user() {
+    # ============ Argument parsing =============
+    local -A args_array=([p]=permission= [u]=user=)
+    local permission
+    local user
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    if ! ynh_permission_exists --permission=$permission; then
+        return 1
+    fi
+
+    # Check both allowed and corresponding_users sections in the json
+    for section in "allowed" "corresponding_users"; do
+        if yunohost user permission info "$app.$permission" --output-as json --quiet \
+            | jq -e --arg user $user --arg section $section '.[$section] | index($user)' >/dev/null; then
+            return 0
+        fi
+    done
+
+    return 1
+}

helpers/helpers.v2.1.d/php

@@ -0,0 +1,317 @@
+#!/bin/bash
+
+# (this is used in the apt helpers, big meh ...)
+readonly YNH_DEFAULT_PHP_VERSION=7.4
+
+# Legacy: auto-convert phpversion to php_version (for consistency with nodejs_version, ruby_version, ...)
+if [[ -n "${app:-}" ]] && [[ -n "${phpversion:-}" ]]
+then
+    if [[ -z "${php_version:-}" ]]
+    then
+        php_version=$phpversion
+        ynh_app_setting_set --key=php_version --value=$php_version
+    fi
+    ynh_app_setting_delete --key=phpversion
+    unset phpversion
+fi
+
+# Create a dedicated PHP-FPM config
+#
+# usage: ynh_config_add_phpfpm
+#
+# This helper assumes the app has an conf/extra_php-fpm.conf snippet
+#
+# The actual PHP configuration will be automatically generated, 
+# and your extra_php-fpm.conf will be appended (typically contains PHP upload limits)
+#
+# The resulting configuration will be deployed to the appropriate place, /etc/php/$php_version/fpm/pool.d/$app.conf
+#
+# Performance-related options in the PHP conf, such as : 
+# pm.max_children, pm.start_servers, pm.min_spare_servers pm.max_spare_servers
+# are computed from two parameters called "usage" and "footprint" which can be set to low/medium/high. (cf details below)
+#
+# If you wish to tweak those, please initialize the settings `fpm_usage` and `fpm_footprint` 
+# *prior* to calling this helper. Otherwise, "low" will be used as a default for both values.
+#
+# Otherwise, if you want the user to have control over these, we encourage to create a config panel 
+# (which should ultimately be standardized by the core ...)
+#
+# The footprint of the service will be used to defined the maximum footprint we can allow, which is half the maximum RAM.
+# So it will be used to defined 'pm.max_children'
+# A lower value for the footprint will allow more children for 'pm.max_children'. And so for
+#    'pm.start_servers', 'pm.min_spare_servers' and 'pm.max_spare_servers' which are defined from the
+#    value of 'pm.max_children'
+# NOTE: 'pm.max_children' can't exceed 4 times the number of processor's cores.
+#
+# The usage value will defined the way php will handle the children for the pool.
+# A value set as 'low' will set the process manager to 'ondemand'. Children will start only if the
+#   service is used, otherwise no child will stay alive. This config gives the lower footprint when the
+#   service is idle. But will use more proc since it has to start a child as soon it's used.
+# Set as 'medium', the process manager will be at dynamic. If the service is idle, a number of children
+#   equal to pm.min_spare_servers will stay alive. So the service can be quick to answer to any request.
+#   The number of children can grow if needed. The footprint can stay low if the service is idle, but
+#   not null. The impact on the proc is a little bit less than 'ondemand' as there's always a few
+#   children already available.
+# Set as 'high', the process manager will be set at 'static'. There will be always as many children as
+#   'pm.max_children', the footprint is important (but will be set as maximum a quarter of the maximum
+#   RAM) but the impact on the proc is lower. The service will be quick to answer as there's always many
+#   children ready to answer.
+#
+# Requires YunoHost version 4.1.0 or higher.
+ynh_config_add_phpfpm() {
+    # ============ Argument parsing =============
+    local -A args_array=([g]=group=)
+    local group
+    ynh_handle_getopts_args "$@"
+    group=${group:-}
+    # ===========================================
+
+    # If the PHP version changed, remove the old fpm conf
+    # (NB: This stuff is also handled by the apt helper, which is usually triggered before this helper)
+    # FIXME: so is this still needed @_@
+    local old_php_version=$(ynh_app_setting_get --key=php_version)
+    if [ -n "$old_php_version" ] && [ "$old_php_version" != "$php_version" ]; then
+        local old_php_fpm_config_dir=$(ynh_app_setting_get --key=fpm_config_dir)
+        local old_php_finalphpconf="$old_php_fpm_config_dir/pool.d/$app.conf"
+
+        if [[ -f "$old_php_finalphpconf" ]]
+        then
+            ynh_backup_if_checksum_is_different "$old_php_finalphpconf"
+            ynh_remove_fpm_config
+        fi
+    fi
+
+    local fpm_service="php${php_version}-fpm"
+    local fpm_config_dir="/etc/php/$php_version/fpm"
+
+    # Create the directory for FPM pools
+    mkdir --parents "$fpm_config_dir/pool.d"
+
+    # FIXME: zzzz do we really need those ...
+    ynh_app_setting_set --key=fpm_config_dir --value="$fpm_config_dir"
+    ynh_app_setting_set --key=fpm_service --value="$fpm_service"
+    ynh_app_setting_set --key=php_version --value=$php_version
+
+    # Define the values to use for the configuration of PHP.
+    _ynh_get_scalable_phpfpm
+
+    local phpfpm_group=$([[ -n "$group" ]] && echo "$group" || echo "$app")
+    local phpfpm_path="$YNH_APP_BASEDIR/conf/php-fpm.conf"
+    echo "
+[__APP__]
+
+user = __APP__
+group = __PHPFPM_GROUP__
+
+chdir = __INSTALL_DIR__
+
+listen = /var/run/php/php__PHP_VERSION__-fpm-__APP__.sock
+listen.owner = www-data
+listen.group = www-data
+
+pm = __PHP_PM__
+pm.max_children = __PHP_MAX_CHILDREN__
+pm.max_requests = 500
+request_terminate_timeout = 1d
+" >"$phpfpm_path"
+
+    if [ "$php_pm" = "dynamic" ]; then
+        echo "
+pm.start_servers = __PHP_START_SERVERS__
+pm.min_spare_servers = __PHP_MIN_SPARE_SERVERS__
+pm.max_spare_servers = __PHP_MAX_SPARE_SERVERS__
+" >>"$phpfpm_path"
+
+    elif [ "$php_pm" = "ondemand" ]; then
+        echo "
+pm.process_idle_timeout = 10s
+" >>"$phpfpm_path"
+    fi
+
+    # Concatene the extra config.
+    if [ -e $YNH_APP_BASEDIR/conf/extra_php-fpm.conf ]; then
+        cat $YNH_APP_BASEDIR/conf/extra_php-fpm.conf >>"$phpfpm_path"
+    fi
+
+    ynh_config_add --template="$phpfpm_path" --destination="$fpm_config_dir/pool.d/$app.conf"
+
+    # Validate that the new php conf doesn't break php-fpm entirely
+    if ! php-fpm${php_version} --test 2>/dev/null; then
+        php-fpm${php_version} --test || true
+        ynh_safe_rm "$fpm_config_dir/pool.d/$app.conf"
+        ynh_die "The new configuration broke php-fpm?"
+    fi
+    ynh_systemctl --service=$fpm_service --action=reload
+}
+
+# Remove the dedicated PHP-FPM config
+#
+# usage: ynh_config_remove_phpfpm
+#
+# Requires YunoHost version 2.7.2 or higher.
+ynh_config_remove_phpfpm() {
+    local fpm_config_dir=$(ynh_app_setting_get --key=fpm_config_dir)
+
+    ynh_safe_rm "$fpm_config_dir/pool.d/$app.conf"
+    ynh_systemctl --service="php${php_version}-fpm" --action=reload
+}
+
+# Define the values to configure PHP-FPM
+#
+# [internal]
+#
+# usage: _ynh_get_scalable_phpfpm
+# Footprint can be defined via the "fpm_footprint", to be set prior to calling this helper
+# low    - Less than 20 MB of RAM by pool.
+# medium - Between 20 MB and 40 MB of RAM by pool.
+# high   - More than 40 MB of RAM by pool.
+# Or specify exactly the footprint, the load of the service as MB by pool instead of having a standard value.
+# To have this value, use the following command and stress the service.
+# watch -n0.5 ps -o user,cmd,%cpu,rss -u APP
+#
+# Usage can be defined via the "fpm_usage", to be set prior to calling this helper
+# low    - Personal usage, behind the SSO.
+# medium - Low usage, few people or/and publicly accessible.
+# high   - High usage, frequently visited website.
+#
+_ynh_get_scalable_phpfpm() {
+
+    # If no usage provided, default to the value existing in setting ... or to low
+    local fpm_usage_in_setting=$(ynh_app_setting_get --key=fpm_usage)
+    local usage=${fpm_usage_in_setting:-low}
+    ynh_app_setting_set --key=fpm_usage --value=$usage
+
+    # If no footprint provided, default to the value existing in setting ... or to low
+    local fpm_footprint_in_setting=$(ynh_app_setting_get --key=fpm_footprint)
+    local footprint=${fpm_footprint_in_setting:-low}
+    ynh_app_setting_set --key=fpm_footprint --value=$footprint
+
+    # Set all characters as lowercase
+    if [ "$footprint" = "low" ]; then
+        footprint=20
+    elif [ "$footprint" = "medium" ]; then
+        footprint=35
+    elif [ "$footprint" = "high" ]; then
+        footprint=50
+    fi
+
+    # Define the factor to determine min_spare_servers
+    # to avoid having too few children ready to start for heavy apps
+    if [ $footprint -le 20 ]; then
+        min_spare_servers_factor=8
+    elif [ $footprint -le 35 ]; then
+        min_spare_servers_factor=5
+    else
+        min_spare_servers_factor=3
+    fi
+
+    # Define the way the process manager handle child processes.
+    if [ "$usage" = "low" ]; then
+        php_pm=ondemand
+    elif [ "$usage" = "medium" ]; then
+        php_pm=dynamic
+    elif [ "$usage" = "high" ]; then
+        php_pm=static
+    else
+        ynh_die "Does not recognize '$usage' as an usage value."
+    fi
+
+    # Get the total of RAM available, except swap.
+    local max_ram=$(ynh_get_ram --total)
+
+    at_least_one() {
+        # Do not allow value below 1
+        if [ $1 -le 0 ]; then
+            echo 1
+        else
+            echo $1
+        fi
+    }
+
+    # Define pm.max_children
+    # The value of pm.max_children is the total amount of ram divide by 2 and divide again by the footprint of a pool for this app.
+    # So if PHP-FPM start the maximum of children, it won't exceed half of the ram.
+    php_max_children=$(($max_ram / 2 / $footprint))
+    # If process manager is set as static, use half less children.
+    # Used as static, there's always as many children as the value of pm.max_children
+    if [ "$php_pm" = "static" ]; then
+        php_max_children=$(($php_max_children / 2))
+    fi
+    php_max_children=$(at_least_one $php_max_children)
+
+    # To not overload the proc, limit the number of children to 4 times the number of cores.
+    local core_number=$(nproc)
+    local max_proc=$(($core_number * 4))
+    if [ $php_max_children -gt $max_proc ]; then
+        php_max_children=$max_proc
+    fi
+
+    # Get a potential forced value for php_max_children
+    local php_forced_max_children=$(ynh_app_setting_get --key=php_forced_max_children)
+    if [ -n "$php_forced_max_children" ]; then
+        php_max_children=$php_forced_max_children
+    fi
+
+    if [ "$php_pm" = "dynamic" ]; then
+        # Define pm.start_servers, pm.min_spare_servers and pm.max_spare_servers for a dynamic process manager
+        php_min_spare_servers=$(($php_max_children / $min_spare_servers_factor))
+        php_min_spare_servers=$(at_least_one $php_min_spare_servers)
+
+        php_max_spare_servers=$(($php_max_children / 2))
+        php_max_spare_servers=$(at_least_one $php_max_spare_servers)
+
+        php_start_servers=$(($php_min_spare_servers + ($php_max_spare_servers - $php_min_spare_servers) / 2))
+        php_start_servers=$(at_least_one $php_start_servers)
+    else
+        php_min_spare_servers=0
+        php_max_spare_servers=0
+        php_start_servers=0
+    fi
+}
+
+# Execute a command with Composer
+#
+# Will use $install_dir as workdir unless $composer_workdir exists (but that shouldnt be necessary)
+#
+# You may also define composer_user=root prior to call this helper if you absolutely need composer to run as root, but this is discouraged...
+#
+# usage: ynh_composer_exec commands
+#
+# Requires YunoHost version 4.2 or higher.
+ynh_composer_exec() {
+    local workdir="${composer_workdir:-$install_dir}"
+
+    COMPOSER_HOME="$workdir/.composer" \
+    COMPOSER_MEMORY_LIMIT=-1 \
+    sudo -E -u "${composer_user:-$app}" \
+    php${php_version} "$workdir/composer.phar" $@ \
+        -d "$workdir" --no-interaction --no-ansi 2>&1
+}
+
+# Install and initialize Composer in the given directory
+#
+# The installed version is defined by $composer_version which should be defined
+# as global prior to calling this helper.
+#
+# Will use $install_dir as workdir unless $composer_workdir exists (but that shouldnt be necessary)
+#
+# usage: ynh_composer_install
+#
+# Requires YunoHost version 4.2 or higher.
+ynh_composer_install() {
+    local workdir="${composer_workdir:-$install_dir}"
+
+    [[ -n "${composer_version}" ]] || ynh_die "\$composer_version should be defined before calling ynh_composer_install. (In the past, this was called \$YNH_COMPOSER_VERSION)"
+
+    [[ ! -e "$workdir/composer.phar" ]] || ynh_safe_rm $workdir/composer.phar
+
+    local composer_url="https://getcomposer.org/download/$composer_version/composer.phar"
+
+    # NB. we have to declare the var as local first,
+    # otherwise 'local foo=$(false) || echo 'pwet'" does'nt work
+    # because local always return 0 ...
+    local out
+    # Timeout option is here to enforce the timeout on dns query and tcp connect (c.f. man wget)
+    out=$(wget --tries 3 --no-dns-cache --timeout 900 --no-verbose --output-document=$workdir/composer.phar $composer_url 2>&1) \
+        || ynh_die "$out"
+}

helpers/helpers.v2.1.d/postgresql

@@ -0,0 +1,120 @@
+#!/bin/bash
+
+PSQL_ROOT_PWD_FILE=/etc/yunohost/psql
+PSQL_VERSION=13
+
+# Run SQL instructions in a database ($db_name by default)
+#
+# usage: ynh_psql_db_shell database <<< "instructions"
+# | arg: database    - the database to connect to (by default, $db_name)
+#
+# examples:
+#    ynh_psql_db_shell $db_name <<< "UPDATE ...;"
+#    ynh_psql_db_shell < /path/to/file.sql
+#
+ynh_psql_db_shell() {
+    local database="${1:-$db_name}"
+    sudo --login --user=postgres psql "$database"
+}
+
+# Create a database and grant optionnaly privilegies to a user
+#
+# [internal]
+#
+# usage: ynh_psql_create_db db [user]
+# | arg: db - the database name to create
+# | arg: user - the user to grant privilegies
+#
+ynh_psql_create_db() {
+    local db=$1
+    local user=${2:-}
+
+    local sql="CREATE DATABASE ${db};"
+
+    # grant all privilegies to user
+    if [ -n "$user" ]; then
+        sql+="ALTER DATABASE ${db} OWNER TO ${user};"
+        sql+="GRANT ALL PRIVILEGES ON DATABASE ${db} TO ${user} WITH GRANT OPTION;"
+    fi
+
+    sudo --login --user=postgres psql <<< "$sql"
+}
+
+# Drop a database
+#
+# [internal]
+#
+# If you intend to drop the database *and* the associated user,
+# consider using ynh_psql_remove_db instead.
+#
+# usage: ynh_psql_drop_db db
+# | arg: db - the database name to drop
+#
+ynh_psql_drop_db() {
+    local db=$1
+    # First, force disconnection of all clients connected to the database
+    # https://stackoverflow.com/questions/17449420/postgresql-unable-to-drop-database-because-of-some-auto-connections-to-db
+    sudo --login --user=postgres psql $db <<< "REVOKE CONNECT ON DATABASE $db FROM public;"
+    sudo --login --user=postgres psql $db <<< "SELECT pg_terminate_backend (pg_stat_activity.pid) FROM pg_stat_activity WHERE pg_stat_activity.datname = '$db' AND pid <> pg_backend_pid();"
+    sudo --login --user=postgres dropdb $db
+}
+
+# Dump a database
+#
+# usage: ynh_psql_dump_db database
+# | arg: database    - the database name to dump (by default, $db_name)
+# | ret: the psqldump output
+#
+# example: ynh_psql_dump_db 'roundcube' > ./dump.sql
+#
+ynh_psql_dump_db() {
+    local database="${1:-$db_name}"
+    sudo --login --user=postgres pg_dump "$database"
+}
+
+# Create a user
+#
+# [internal]
+#
+# usage: ynh_psql_create_user user pwd
+# | arg: user - the user name to create
+# | arg: pwd - the password to identify user by
+#
+ynh_psql_create_user() {
+    sudo --login --user=postgres psql <<< "CREATE USER $user WITH ENCRYPTED PASSWORD '$pwd'"
+}
+
+# Check if a psql user exists
+#
+# [packagingv1]
+#
+# usage: ynh_psql_user_exists user
+# | arg: user=    - the user for which to check existence
+# | exit: Return 1 if the user doesn't exist, 0 otherwise
+#
+ynh_psql_user_exists() {
+    local user=$1
+    sudo --login --user=postgres psql -tAc "SELECT rolname FROM pg_roles WHERE rolname='$user';" | grep --quiet "$user"
+}
+
+# Check if a psql database exists
+#
+# usage: ynh_psql_database_exists database
+# | arg: database    - the database for which to check existence
+# | exit: Return 1 if the database doesn't exist, 0 otherwise
+#
+ynh_psql_database_exists() {
+    local database=$1
+    sudo --login --user=postgres psql -tAc "SELECT datname FROM pg_database WHERE datname='$database';" | grep --quiet "$database"
+}
+
+# Drop a user
+#
+# [internal]
+#
+# usage: ynh_psql_drop_user user
+# | arg: user - the user name to drop
+#
+ynh_psql_drop_user() {
+    sudo --login --user=postgres psql <<< "DROP USER ${1};"
+}

helpers/helpers.v2.1.d/redis

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+# get the first available redis database
+#
+# usage: ynh_redis_get_free_db
+# | returns: the database number to use
+ynh_redis_get_free_db() {
+	local result max db
+	result=$(redis-cli INFO keyspace)
+
+	# get the num
+	max=$(cat /etc/redis/redis.conf | grep ^databases | grep -Eow "[0-9]+")
+
+	db=0
+	# default Debian setting is 15 databases
+	for i in $(seq 0 "$max")
+	do
+	 	if ! echo "$result" | grep -q "db$i"
+	 	then
+			db=$i
+	 		break 1
+ 		fi
+ 		db=-1
+	done
+
+	test "$db" -eq -1 && ynh_die "No available Redis databases..."
+
+	echo "$db"
+}
+
+# Create a master password and set up global settings
+# Please always call this script in install and restore scripts
+#
+# usage: ynh_redis_remove_db database
+# | arg: database - the database to erase
+ynh_redis_remove_db() {
+	local db=$1
+	redis-cli -n "$db" flushdb
+}

helpers/helpers.v2.1.d/ruby

@@ -0,0 +1,258 @@
+#!/bin/bash
+
+rbenv_install_dir="/opt/rbenv"
+ruby_version_path="$rbenv_install_dir/versions"
+
+# RBENV_ROOT is the directory of rbenv, it needs to be loaded as a environment variable.
+export RBENV_ROOT="$rbenv_install_dir"
+export rbenv_root="$rbenv_install_dir"
+
+_ynh_load_ruby_in_path_and_other_tweaks() {
+
+    # Get the absolute path of this version of Ruby
+    local ruby_path="$ruby_version_path/$app/bin"
+
+    # Load the path of this version of ruby in $PATH
+    if [[ :$PATH: != *":$ruby_path"* ]]; then
+        PATH="$ruby_path:$PATH"
+    fi
+
+    # Export PATH such that it's available through sudo -E / ynh_exec_as $app
+    export PATH
+
+    # This is in full lowercase such that it gets replaced in templates
+    path_with_ruby="$PATH"
+    PATH_with_ruby="$PATH"
+
+    # Sets the local application-specific Ruby version
+    pushd ${install_dir}
+        $rbenv_install_dir/bin/rbenv local $ruby_version
+    popd
+}
+
+# Install a specific version of Ruby using rbenv
+#
+# The installed version is defined by $ruby_version which should be defined as global prior to calling this helper
+#
+# This helper creates a /etc/profile.d/rbenv.sh that configures PATH environment for rbenv
+# for every LOGIN user, hence your user must have a defined shell (as opposed to /usr/sbin/nologin)
+#
+# Don't forget to execute ruby-dependent command in a login environment
+# (e.g. sudo --login option)
+# When not possible (e.g. in systemd service definition), please use direct path
+# to rbenv shims (e.g. $RBENV_ROOT/shims/bundle)
+#
+# usage: ynh_ruby_install
+#
+# Adds the appropriate, specific version of ruby to the PATH variable (which
+# is also exported, to ease the use of ynh_exec_as_app). Also define variable
+# PATH_with_ruby to be used in the systemd config
+# (Environment="PATH=__PATH_WITH_RUBY__")
+#
+# Requires YunoHost version 3.2.2 or higher.
+ynh_ruby_install () {
+
+    [[ -n "${ruby_version:-}" ]] || ynh_die "\$ruby_version should be defined prior to calling ynh_ruby_install"
+
+    # Load rbenv path in PATH
+    local CLEAR_PATH="$rbenv_install_dir/bin:$PATH"
+
+    # Remove /usr/local/bin in PATH in case of Ruby prior installation
+    PATH=$(echo $CLEAR_PATH | sed 's@/usr/local/bin:@@')
+
+    # Move an existing Ruby binary, to avoid to block rbenv
+    test -x /usr/bin/ruby && mv /usr/bin/ruby /usr/bin/ruby_rbenv
+
+    # Install or update rbenv
+    mkdir -p $rbenv_install_dir
+    rbenv="$(command -v rbenv $rbenv_install_dir/bin/rbenv | grep "$rbenv_install_dir/bin/rbenv" | head -1)"
+    if [ -n "$rbenv" ]; then
+        pushd "${rbenv%/*/*}"
+            if git remote -v 2>/dev/null | grep "https://github.com/rbenv/rbenv.git"; then
+                echo "Updating rbenv..."
+                git pull -q --tags origin master
+                ynh_ruby_try_bash_extension
+            else
+                echo "Reinstalling rbenv..."
+                cd ..
+                ynh_safe_rm $rbenv_install_dir
+                mkdir -p $rbenv_install_dir
+                cd $rbenv_install_dir
+                git init -q
+                git remote add -f -t master origin https://github.com/rbenv/rbenv.git > /dev/null 2>&1
+                git checkout -q -b master origin/master
+                ynh_ruby_try_bash_extension
+                rbenv=$rbenv_install_dir/bin/rbenv
+            fi
+        popd
+    else
+        echo "Installing rbenv..."
+        pushd $rbenv_install_dir
+            git init -q
+            git remote add -f -t master origin https://github.com/rbenv/rbenv.git > /dev/null 2>&1
+            git checkout -q -b master origin/master
+            ynh_ruby_try_bash_extension
+            rbenv=$rbenv_install_dir/bin/rbenv
+        popd
+    fi
+
+    mkdir -p "${rbenv_install_dir}/plugins"
+
+    ruby_build="$(command -v "$rbenv_install_dir"/plugins/*/bin/rbenv-install rbenv-install | head -1)"
+    if [ -n "$ruby_build" ]; then
+        pushd "${ruby_build%/*/*}"
+            if git remote -v 2>/dev/null | grep "https://github.com/rbenv/ruby-build.git"; then
+                echo "Updating ruby-build..."
+                git pull -q origin master
+            fi
+        popd
+    else
+        echo "Installing ruby-build..."
+        git clone -q https://github.com/rbenv/ruby-build.git "${rbenv_install_dir}/plugins/ruby-build"
+    fi
+
+    rbenv_alias="$(command -v "$rbenv_install_dir"/plugins/*/bin/rbenv-alias rbenv-alias | head -1)"
+    if [ -n "$rbenv_alias" ]; then
+        pushd "${rbenv_alias%/*/*}"
+            if git remote -v 2>/dev/null | grep "https://github.com/tpope/rbenv-aliases.git"; then
+                echo "Updating rbenv-aliases..."
+                git pull -q origin master
+            fi
+        popd
+    else
+        echo "Installing rbenv-aliases..."
+        git clone -q https://github.com/tpope/rbenv-aliases.git "${rbenv_install_dir}/plugins/rbenv-aliase"
+    fi
+
+    rbenv_latest="$(command -v "$rbenv_install_dir"/plugins/*/bin/rbenv-latest rbenv-latest | head -1)"
+    if [ -n "$rbenv_latest" ]; then
+        pushd "${rbenv_latest%/*/*}"
+            if git remote -v 2>/dev/null | grep "https://github.com/momo-lab/xxenv-latest.git"; then
+                echo "Updating xxenv-latest..."
+                git pull -q origin master
+            fi
+        popd
+    else
+        echo "Installing xxenv-latest..."
+        git clone -q https://github.com/momo-lab/xxenv-latest.git "${rbenv_install_dir}/plugins/xxenv-latest"
+    fi
+
+    # Enable caching
+    mkdir -p "${rbenv_install_dir}/cache"
+
+    # Create shims directory if needed
+    mkdir -p "${rbenv_install_dir}/shims"
+
+    # Restore /usr/local/bin in PATH
+    PATH=$CLEAR_PATH
+
+    # And replace the old Ruby binary
+    test -x /usr/bin/ruby_rbenv && mv /usr/bin/ruby_rbenv /usr/bin/ruby
+
+    # Install the requested version of Ruby
+    local final_ruby_version=$(rbenv latest --print $ruby_version)
+    if ! [ -n "$final_ruby_version" ]; then
+        final_ruby_version=$ruby_version
+    fi
+    echo "Installing Ruby $final_ruby_version"
+    RUBY_CONFIGURE_OPTS="--disable-install-doc --with-jemalloc" MAKE_OPTS="-j2" rbenv install --skip-existing $final_ruby_version > /dev/null 2>&1
+
+    # Store ruby_version into the config of this app
+    ynh_app_setting_set --key=ruby_version --value=$final_ruby_version
+    ruby_version=$final_ruby_version
+
+    # Remove app virtualenv
+    if rbenv alias --list | grep --quiet "$app "
+    then
+        rbenv alias $app --remove
+    fi
+
+    # Create app virtualenv
+    rbenv alias $app $final_ruby_version
+
+    # Cleanup Ruby versions
+    _ynh_ruby_cleanup
+
+    # Set environment for Ruby users
+    echo  "#rbenv
+export RBENV_ROOT=$rbenv_install_dir
+export PATH=\"$rbenv_install_dir/bin:$PATH\"
+eval \"\$(rbenv init -)\"
+#rbenv" > /etc/profile.d/rbenv.sh
+
+    # Load the environment
+    eval "$(rbenv init -)"
+
+    _ynh_load_ruby_in_path_and_other_tweaks
+}
+
+# Remove the version of Ruby used by the app.
+#
+# This helper will also cleanup Ruby versions
+#
+# usage: ynh_ruby_remove
+ynh_ruby_remove () {
+    local ruby_version=$(ynh_app_setting_get --key=ruby_version)
+
+    # Load rbenv path in PATH
+    local CLEAR_PATH="$rbenv_install_dir/bin:$PATH"
+
+    # Remove /usr/local/bin in PATH in case of Ruby prior installation
+    PATH=$(echo $CLEAR_PATH | sed 's@/usr/local/bin:@@')
+
+    rbenv alias $app --remove
+
+    # Remove the line for this app
+    ynh_app_setting_delete --key=ruby_version
+
+    # Cleanup Ruby versions
+    _ynh_ruby_cleanup
+}
+
+# Remove no more needed versions of Ruby used by the app.
+#
+# This helper will check what Ruby version are no more required,
+# and uninstall them
+# If no app uses Ruby, rbenv will be also removed.
+_ynh_ruby_cleanup () {
+
+    # List required Ruby versions
+    local installed_apps=$(yunohost app list | grep -oP 'id: \K.*$')
+    local required_ruby_versions=""
+    for installed_app in $installed_apps
+    do
+        local installed_app_ruby_version=$(ynh_app_setting_get --app=$installed_app --key="ruby_version")
+        if [[ -n "$installed_app_ruby_version" ]]
+        then
+            required_ruby_versions="${installed_app_ruby_version}\n${required_ruby_versions}"
+        fi
+    done
+
+    # Remove no more needed Ruby versions
+    local installed_ruby_versions=$(rbenv versions --bare --skip-aliases | grep -Ev '/')
+    for installed_ruby_version in $installed_ruby_versions
+    do
+        if ! echo ${required_ruby_versions} | grep -q "${installed_ruby_version}"
+        then
+            echo "Removing Ruby-$installed_ruby_version"
+            $rbenv_install_dir/bin/rbenv uninstall --force $installed_ruby_version
+        fi
+    done
+
+    # If none Ruby version is required
+    if [[ -z "$required_ruby_versions" ]]
+    then
+        # Remove rbenv environment configuration
+        echo "Removing rbenv"
+        ynh_safe_rm "$rbenv_install_dir"
+        ynh_safe_rm "/etc/profile.d/rbenv.sh"
+    fi
+}
+
+ynh_ruby_try_bash_extension() {
+  if [ -x src/configure ]; then
+    src/configure && make -C src 2>&1 || {
+      ynh_print_info "Optional bash extension failed to build, but things will still work normally."
+    }
+  fi
+}

helpers/helpers.v2.1.d/setting

@@ -0,0 +1,95 @@
+#!/bin/bash
+
+# Get an application setting
+#
+# usage: ynh_app_setting_get --app=app --key=key
+# | arg: -a, --app=     - the application id
+# | arg: -k, --key=     - the setting to get
+#
+# Requires YunoHost version 2.2.4 or higher.
+ynh_app_setting_get() {
+    # ============ Argument parsing =============
+    local _globalapp=${app-:}
+    local -A args_array=([a]=app= [k]=key=)
+    local app
+    local key
+    ynh_handle_getopts_args "$@"
+    app="${app:-$_globalapp}"
+    # ===========================================
+
+    ynh_app_setting "get" "$app" "$key"
+}
+
+# Set an application setting
+#
+# usage: ynh_app_setting_set --app=app --key=key --value=value
+# | arg: -a, --app=     - the application id
+# | arg: -k, --key=     - the setting name to set
+# | arg: -v, --value=   - the setting value to set
+#
+# Requires YunoHost version 2.2.4 or higher.
+ynh_app_setting_set() {
+    # ============ Argument parsing =============
+    local _globalapp=${app-:}
+    local -A args_array=([a]=app= [k]=key= [v]=value=)
+    local app
+    local key
+    local value
+    ynh_handle_getopts_args "$@"
+    app="${app:-$_globalapp}"
+    # ===========================================
+
+    ynh_app_setting "set" "$app" "$key" "$value"
+}
+
+# Delete an application setting
+#
+# usage: ynh_app_setting_delete --app=app --key=key
+# | arg: -a, --app=     - the application id
+# | arg: -k, --key=     - the setting to delete
+#
+# Requires YunoHost version 2.2.4 or higher.
+ynh_app_setting_delete() {
+    # ============ Argument parsing =============
+    local _globalapp=${app-:}
+    local -A args_array=([a]=app= [k]=key=)
+    local app
+    local key
+    ynh_handle_getopts_args "$@"
+    app="${app:-$_globalapp}"
+    # ===========================================
+
+    ynh_app_setting "delete" "$app" "$key"
+}
+
+# Small "hard-coded" interface to avoid calling "yunohost app" directly each
+# time dealing with a setting is needed (which may be so slow on ARM boards)
+#
+# [internal]
+#
+ynh_app_setting() {
+    set +o xtrace # set +x
+    ACTION="$1" APP="$2" KEY="$3" VALUE="${4:-}" python3 - <<EOF
+import os, yaml, sys
+app, action = os.environ['APP'], os.environ['ACTION'].lower()
+key, value = os.environ['KEY'], os.environ.get('VALUE', None)
+setting_file = "/etc/yunohost/apps/%s/settings.yml" % app
+assert os.path.exists(setting_file), "Setting file %s does not exists ?" % setting_file
+with open(setting_file) as f:
+    settings = yaml.safe_load(f)
+if action == "get":
+    if key in settings:
+        print(settings[key])
+else:
+    if action == "delete":
+        if key in settings:
+            del settings[key]
+    elif action == "set":
+        settings[key] = value
+    else:
+        raise ValueError("action should either be get, set or delete")
+    with open(setting_file, "w") as f:
+        yaml.safe_dump(settings, f, default_flow_style=False)
+EOF
+    set -o xtrace # set -x
+}

helpers/helpers.v2.1.d/string

@@ -0,0 +1,139 @@
+#!/bin/bash
+
+# Generate a random string
+#
+# usage: ynh_string_random [--length=string_length]
+# | arg: -l, --length=  - the string length to generate (default: 24)
+# | arg: -f, --filter=  - the kind of characters accepted in the output (default: 'A-Za-z0-9')
+# | ret: the generated string
+#
+# example: pwd=$(ynh_string_random --length=8)
+#
+# Requires YunoHost version 2.2.4 or higher.
+ynh_string_random() {
+    # ============ Argument parsing =============
+    local -A args_array=([l]=length= [f]=filter=)
+    local length
+    local filter
+    ynh_handle_getopts_args "$@"
+    length=${length:-24}
+    filter=${filter:-'A-Za-z0-9'}
+    # ===========================================
+
+    dd if=/dev/urandom bs=1 count=1000 2>/dev/null \
+        | tr --complement --delete "$filter" \
+        | sed --quiet 's/\(.\{'"$length"'\}\).*/\1/p'
+}
+
+# Substitute/replace a string (or expression) by another in a file
+#
+# usage: ynh_replace --match=match --replace=replace --file=file
+# | arg: -m, --match=    - String to be searched and replaced in the file
+# | arg: -r, --replace=  - String that will replace matches
+# | arg: -f, --file=     - File in which the string will be replaced.
+#
+# As this helper is based on sed command, regular expressions and references to
+# sub-expressions can be used (see sed manual page for more information)
+#
+# Requires YunoHost version 2.6.4 or higher.
+ynh_replace() {
+    # ============ Argument parsing =============
+    local -A args_array=([m]=match= [r]=replace= [f]=file=)
+    local match
+    local replace
+    local file
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+    set +o xtrace # set +x
+
+    local delimit=$'\001'
+    # Escape the delimiter if it's in the string.
+    match=${match//${delimit}/"\\${delimit}"}
+    replace=${replace//${delimit}/"\\${delimit}"}
+
+    set -o xtrace # set -x
+    sed --in-place "s${delimit}${match}${delimit}${replace}${delimit}g" "$file"
+}
+
+# Substitute/replace a special string by another in a file
+#
+# usage: ynh_replace_special_string --match=match --replace=replace --file=file
+# | arg: -m, --match=    - String to be searched and replaced in the file
+# | arg: -r, --replace=  - String that will replace matches
+# | arg: -f, --file=     - File in which the string will be replaced.
+#
+# This helper will use ynh_replace, but as you can use special
+# characters, you can't use some regular expressions and sub-expressions.
+#
+# Requires YunoHost version 2.7.7 or higher.
+ynh_replace_special_string() {
+    # ============ Argument parsing =============
+    local -A args_array=([m]=match= [r]=replace= [f]=file=)
+    local match
+    local replace
+    local file
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    # Escape any backslash to preserve them as simple backslash.
+    match=${match//\\/"\\\\"}
+    replace=${replace//\\/"\\\\"}
+
+    # Escape the & character, who has a special function in sed.
+    match=${match//&/"\&"}
+    replace=${replace//&/"\&"}
+
+    ynh_replace --match="$match" --replace="$replace" --file="$file"
+}
+
+# Sanitize a string intended to be the name of a database
+#
+# [packagingv1]
+#
+# usage: ynh_sanitize_dbid --db_name=name
+# | arg: -n, --db_name=     - name to correct/sanitize
+# | ret: the corrected name
+#
+# example: dbname=$(ynh_sanitize_dbid $app)
+#
+# Underscorify the string (replace - and . by _)
+#
+# Requires YunoHost version 2.2.4 or higher.
+ynh_sanitize_dbid() {
+    # ============ Argument parsing =============
+    local -A args_array=([n]=db_name=)
+    local db_name
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    # We should avoid having - and . in the name of databases. They are replaced by _
+    echo ${db_name//[-.]/_}
+}
+
+# Normalize the url path syntax
+#
+# Handle the slash at the beginning of path and its absence at ending
+# Return a normalized url path
+#
+# examples:
+#     url_path=$(ynh_normalize_url_path $url_path)
+#     ynh_normalize_url_path example    # -> /example
+#     ynh_normalize_url_path /example   # -> /example
+#     ynh_normalize_url_path /example/  # -> /example
+#     ynh_normalize_url_path /          # -> /
+#
+# usage: ynh_normalize_url_path path_to_normalize
+#
+# Requires YunoHost version 2.6.4 or higher.
+ynh_normalize_url_path() {
+    local path_url=$1
+
+    test -n "$path_url" || ynh_die "ynh_normalize_url_path expect a URL path as first argument and received nothing."
+    if [ "${path_url:0:1}" != "/" ]; then # If the first character is not a /
+        path_url="/$path_url"             # Add / at begin of path variable
+    fi
+    if [ "${path_url:${#path_url}-1}" == "/" ] && [ ${#path_url} -gt 1 ]; then # If the last character is a / and that not the only character.
+        path_url="${path_url:0:${#path_url}-1}"                                # Delete the last character
+    fi
+    echo $path_url
+}

helpers/helpers.v2.1.d/systemd

@@ -0,0 +1,172 @@
+#!/bin/bash
+
+# Create a dedicated systemd config
+#
+# usage: ynh_config_add_systemd [--service=service] [--template=template]
+# | arg: -s, --service=     - Service name (optionnal, `$app` by default)
+# | arg: -t, --template=    - Name of template file (optionnal, this is 'systemd' by default, meaning `../conf/systemd.service` will be used as template)
+#
+# This will use the template `../conf/<templatename>.service`.
+#
+# See the documentation of `ynh_config_add` for a description of the template
+# format and how placeholders are replaced with actual variables.
+#
+# Requires YunoHost version 4.1.0 or higher.
+ynh_config_add_systemd() {
+    # ============ Argument parsing =============
+    local -A args_array=([s]=service= [t]=template=)
+    local service
+    local template
+    ynh_handle_getopts_args "$@"
+    service="${service:-$app}"
+    template="${template:-systemd.service}"
+    # ===========================================
+
+    ynh_config_add --template="$template" --destination="/etc/systemd/system/$service.service"
+
+    systemctl enable $service --quiet
+    systemctl daemon-reload
+}
+
+# Remove the dedicated systemd config
+#
+# usage: ynh_config_remove_systemd service
+# | arg: service   - Service name (optionnal, $app by default)
+ynh_config_remove_systemd() {
+    local service="${1:-$app}"
+    if [ -e "/etc/systemd/system/$service.service" ]; then
+        ynh_systemctl --service=$service --action=stop
+        systemctl disable $service --quiet
+        ynh_safe_rm "/etc/systemd/system/$service.service"
+        systemctl daemon-reload
+    fi
+}
+
+# Start (or other actions) a service,  print a log in case of failure and optionnaly wait until the service is completely started
+#
+# usage: ynh_systemctl [--service=service] [--action=action] [ [--wait_until="line to match"] [--log_path=log_path] [--timeout=300] [--length=20] ]
+# | arg: -n, --service= - Name of the service to start. Default : `$app`
+# | arg: -a, --action=       - Action to perform with systemctl. Default: start
+# | arg: -w, --wait_until=   - The pattern to find in the log to attest the service is effectively fully started.
+# | arg: -p, --log_path=     - Log file - Path to the log file. Default : `/var/log/$app/$app.log`
+# | arg: -t, --timeout=      - Timeout - The maximum time to wait before ending the watching. Default : 300 seconds.
+# | arg: -e, --length=       - Length of the error log displayed for debugging : Default : 20
+#
+# Requires YunoHost version 3.5.0 or higher.
+ynh_systemctl() {
+    # ============ Argument parsing =============
+    local -A args_array=([n]=service= [a]=action= [w]=wait_until= [p]=log_path= [t]=timeout= [e]=length=)
+    local service
+    local action
+    local wait_until
+    local length
+    local log_path
+    local timeout
+    ynh_handle_getopts_args "$@"
+    service="${service:-$app}"
+    action=${action:-start}
+    wait_until=${wait_until:-}
+    length=${length:-20}
+    log_path="${log_path:-/var/log/$service/$service.log}"
+    timeout=${timeout:-300}
+    # ===========================================
+
+    # Manage case of service already stopped
+    if [ "$action" == "stop" ] && ! systemctl is-active --quiet $service; then
+        return 0
+    fi
+
+    # Start to read the log
+    if [[ -n "$wait_until" ]]; then
+        local templog="$(mktemp)"
+        # Following the starting of the app in its log
+        if [ "$log_path" == "systemd" ]; then
+            # Read the systemd journal
+            journalctl --unit=$service --follow --since=-0 --quiet >"$templog" &
+            # Get the PID of the journalctl command
+            local pid_tail=$!
+        else
+            # Read the specified log file
+            tail --follow=name --retry --lines=0 "$log_path" >"$templog" 2>&1 &
+            # Get the PID of the tail command
+            local pid_tail=$!
+        fi
+    fi
+
+    # Use reload-or-restart instead of reload. So it wouldn't fail if the service isn't running.
+    if [ "$action" == "reload" ]; then
+        action="reload-or-restart"
+    fi
+
+    local time_start="$(date --utc --rfc-3339=seconds | cut -d+ -f1) UTC"
+
+    # If the service fails to perform the action
+    if ! systemctl $action $service; then
+        # Show syslog for this service
+        journalctl --quiet --no-hostname --no-pager --lines=$length --unit=$service >&2
+        # If a log is specified for this service, show also the content of this log
+        if [ -e "$log_path" ]; then
+            tail --lines=$length "$log_path" >&2
+        fi
+        _ynh_clean_check_starting
+        return 1
+    fi
+
+    # Start the timeout and try to find wait_until
+    if [[ -n "${wait_until:-}" ]]; then
+        set +x
+        local i=0
+        local starttime=$(date +%s)
+        for i in $(seq 1 $timeout); do
+            # Read the log until the sentence is found, that means the app finished to start. Or run until the timeout
+            if [ "$log_path" == "systemd" ]; then
+                # For systemd services, we in fact dont rely on the templog, which for some reason is not reliable, but instead re-read journalctl every iteration, starting at the timestamp where we triggered the action
+                if journalctl --unit=$service --since="$time_start" --quiet --no-pager --no-hostname | grep --extended-regexp --quiet "$wait_until"; then
+                    ynh_print_info "The service $service has correctly executed the action ${action}."
+                    break
+                fi
+            else
+                if grep --extended-regexp --quiet "$wait_until" "$templog"; then
+                    ynh_print_info "The service $service has correctly executed the action ${action}."
+                    break
+                fi
+            fi
+            if [ $i -eq 30 ]; then
+                echo "(this may take some time)" >&2
+            fi
+            # Also check the timeout using actual timestamp, because sometimes for some reason,
+            # journalctl may take a huge time to run, and we end up waiting literally an entire hour
+            # instead of 5 min ...
+            if [[ "$(( $(date +%s) - $starttime))" -gt "$timeout" ]]
+            then
+                i=$timeout
+                break
+            fi
+            sleep 1
+        done
+        set -x
+        if [ $i -ge 3 ]; then
+            echo "" >&2
+        fi
+        if [ $i -eq $timeout ]; then
+            ynh_print_warn "The service $service didn't fully executed the action ${action} before the timeout."
+            ynh_print_warn "Please find here an extract of the end of the log of the service $service:"
+            journalctl --quiet --no-hostname --no-pager --lines=$length --unit=$service >&2
+            if [ -e "$log_path" ]; then
+                ynh_print_warn "==="
+                tail --lines=$length "$log_path" >&2
+            fi
+        fi
+        _ynh_clean_check_starting
+    fi
+}
+
+_ynh_clean_check_starting() {
+    if [ -n "${pid_tail:-}" ]; then
+        # Stop the execution of tail.
+        kill -SIGTERM $pid_tail 2>&1
+    fi
+    if [ -n "${templog:-}" ]; then
+        ynh_safe_rm "$templog" 2>&1
+    fi
+}

helpers/helpers.v2.1.d/templating

@@ -0,0 +1,388 @@
+#!/bin/bash
+
+# Create a dedicated config file from a template
+#
+# usage: ynh_config_add --template="template" --destination="destination"
+# | arg: -t, --template=     - Template config file to use
+# | arg: -d, --destination=  - Destination of the config file
+# | arg: -j, --jinja         - Use jinja template instead of legacy __MY_VAR__
+#
+# examples:
+#    ynh_config_add --template=".env" --destination="$install_dir/.env" use the template file "../conf/.env"
+#    ynh_config_add --jinja --template="config.j2" --destination="$install_dir/config" use the template file "../conf/config.j2"
+#    ynh_config_add --template="/etc/nginx/sites-available/default" --destination="etc/nginx/sites-available/mydomain.conf"
+#
+##
+## How it works in "legacy" mode
+##
+# The template can be by default the name of a file in the conf directory
+# of a YunoHost Package, a relative path or an absolute path.
+#
+# The helper will use the template `template` to generate a config file
+# `destination` by replacing the following keywords with global variables
+# that should be defined before calling this helper :
+# ```
+#   __USER__                by $app
+#   __YNH_NODE_LOAD_PATH__  by $ynh_node_load_PATH
+# ```
+# And any dynamic variables that should be defined before calling this helper like:
+# ```
+#   __DOMAIN__   by $domain
+#   __PATH__     by $path
+#   __APP__      by $app
+#   __VAR_1__    by $var_1
+#   __VAR_2__    by $var_2
+# ```
+#
+##
+## When --jinja is enabled
+##
+# For a full documentation of the template you can refer to: https://jinja.palletsprojects.com/en/3.1.x/templates/
+# In Yunohost context there are no really some specificity except that all variable passed are of type string.
+# So here are some example of recommended usage:
+#
+# If you need a conditional block
+#
+# {% if should_my_block_be_shown == 'true' %}
+# ...
+# {% endif %}
+#
+# or
+#
+# {% if should_my_block_be_shown == '1' %}
+# ...
+# {% endif %}
+#
+# If you need to iterate with loop:
+#
+# {% for yolo in var_with_multiline_value.splitlines() %}
+# ...
+# {% endfor %}
+#
+# or
+#
+# {% for jail in my_var_with_coma.split(',') %}
+# ...
+# {% endfor %}
+#
+# The helper will verify the checksum and backup the destination file
+# if it's different before applying the new template.
+#
+# And it will calculate and store the destination file checksum
+# into the app settings when configuration is done.
+#
+# Requires YunoHost version 4.1.0 or higher.
+ynh_config_add() {
+    # ============ Argument parsing =============
+    local -A args_array=([t]=template= [d]=destination= [j]=jinja)
+    local template
+    local destination
+    local jinja
+    ynh_handle_getopts_args "$@"
+    jinja="${jinja:-0}"
+    # ===========================================
+
+    local template_path
+    if [ -f "$YNH_APP_BASEDIR/conf/$template" ]; then
+        template_path="$YNH_APP_BASEDIR/conf/$template"
+    elif [ -f "$template" ]; then
+        template_path=$template
+    else
+        ynh_die "The provided template $template doesn't exist"
+    fi
+
+    ynh_backup_if_checksum_is_different "$destination"
+
+    # Make sure to set the permissions before we copy the file
+    # This is to cover a case where an attacker could have
+    # created a file beforehand to have control over it
+    # (cp won't overwrite ownership / modes by default...)
+    touch $destination
+    chmod 640 $destination
+    _ynh_apply_default_permissions $destination
+
+    if [[ "$jinja" == 1 ]]
+    then
+        # This is ran in a subshell such that the "export" does not "contaminate" the main process
+        (
+            export $(compgen -v)
+            j2 "$template_path" -f env -o $destination
+        )
+    else
+        cp -f "$template_path" "$destination"
+        ynh_replace_vars --file="$destination"
+    fi
+
+    ynh_store_file_checksum "$destination"
+}
+
+# Replace variables in a file
+#
+# [internal]
+#
+# usage: ynh_replace_vars --file="file"
+# | arg: -f, --file=     - File where to replace variables
+#
+# The helper will replace the following keywords with global variables
+# that should be defined before calling this helper :
+#   __PATH__                by $path
+#   __PATH__/               by $path/ if $path != /, or just / otherwise (instead of //)
+#   __USER__                by $app
+#   __YNH_NODE_LOAD_PATH__  by $ynh_node_load_PATH
+#
+# And any dynamic variables that should be defined before calling this helper like:
+#   __DOMAIN__   by $domain
+#   __APP__      by $app
+#   __VAR_1__    by $var_1
+#   __VAR_2__    by $var_2
+#
+# Requires YunoHost version 4.1.0 or higher.
+ynh_replace_vars() {
+    # ============ Argument parsing =============
+    local -A args_array=([f]=file=)
+    local file
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    # Replace specific YunoHost variables
+    if test -n "${path:-}"; then
+        # path_slash_less is path, or a blank value if path is only '/'
+        local path_slash_less=${path%/}
+        ynh_replace --match="__PATH__/" --replace="$path_slash_less/" --file="$file"
+        ynh_replace --match="__PATH__" --replace="$path" --file="$file"
+    fi
+    if test -n "${app:-}"; then
+        ynh_replace --match="__USER__" --replace="$app" --file="$file"
+    fi
+    if test -n "${ynh_node_load_PATH:-}"; then
+        ynh_replace --match="__YNH_NODE_LOAD_PATH__" --replace="$ynh_node_load_PATH" --file="$file"
+    fi
+
+    # Replace others variables
+
+    # List other unique (__ __) variables in $file
+    local uniques_vars=($(grep -oP '__[A-Z0-9]+?[A-Z0-9_]*?[A-Z0-9]*?__' $file | sort --unique | sed "s@__\([^.]*\)__@\L\1@g"))
+
+    set +o xtrace # set +x
+
+    # Do the replacement
+    local delimit=@
+    for one_var in "${uniques_vars[@]}"; do
+        # Validate that one_var is indeed defined
+        # -v checks if the variable is defined, for example:
+        #     -v FOO  tests if $FOO is defined
+        #     -v $FOO tests if ${!FOO} is defined
+        # More info: https://stackoverflow.com/questions/3601515/how-to-check-if-a-variable-is-set-in-bash/17538964#comment96392525_17538964
+        [[ -v "${one_var:-}" ]] || ynh_die "Variable \$$one_var wasn't initialized when trying to replace __${one_var^^}__ in $file"
+
+        # Escape delimiter in match/replace string
+        match_string="__${one_var^^}__"
+        match_string=${match_string//${delimit}/"\\${delimit}"}
+        replace_string="${!one_var}"
+        replace_string=${replace_string//\\/\\\\}
+        replace_string=${replace_string//${delimit}/"\\${delimit}"}
+
+        # Actually replace (sed is used instead of ynh_replace_string to avoid triggering an epic amount of debug logs)
+        sed --in-place "s${delimit}${match_string}${delimit}${replace_string}${delimit}g" "$file"
+    done
+    set -o xtrace # set -x
+}
+
+# Get a value from heterogeneous file (yaml, json, php, python...)
+#
+# usage: ynh_read_var_in_file --file=PATH --key=KEY
+# | arg: -f, --file=     - the path to the file
+# | arg: -k, --key=     - the key to get
+# | arg: -a, --after=     - the line just before the key (in case of multiple lines with the name of the key in the file)
+#
+# This helpers match several var affectation use case in several languages
+# We don't use jq or equivalent to keep comments and blank space in files
+# This helpers work line by line, it is not able to work correctly
+# if you have several identical keys in your files
+#
+# Example of line this helpers can managed correctly
+# .yml
+#     title: YunoHost documentation
+#     email: 'yunohost@yunohost.org'
+# .json
+#     "theme": "colib'ris",
+#     "port": 8102
+#     "some_boolean":     false,
+#     "user": null
+# .ini
+#     some_boolean = On
+#     action = "Clear"
+#     port = 20
+# .php
+#     $user=
+#     user => 20
+# .py
+#     USER = 8102
+#     user = 'https://donate.local'
+#     CUSTOM['user'] = 'YunoHost'
+#
+# Requires YunoHost version 4.3 or higher.
+ynh_read_var_in_file() {
+    # ============ Argument parsing =============
+    local -A args_array=([f]=file= [k]=key= [a]=after=)
+    local file
+    local key
+    local after
+    ynh_handle_getopts_args "$@"
+    after="${after:-}"
+    # ===========================================
+
+    [[ -f $file ]] || ynh_die "File $file does not exists"
+
+    set +o xtrace # set +x
+
+    # Get the line number after which we search for the variable
+    local line_number=1
+    if [[ -n "$after" ]]; then
+        line_number=$(grep -m1 -n $after $file | cut -d: -f1)
+        if [[ -z "$line_number" ]]; then
+            set -o xtrace # set -x
+            return 1
+        fi
+    fi
+
+    local filename="$(basename -- "$file")"
+    local ext="${filename##*.}"
+    local endline=',;'
+    local assign="=>|:|="
+    local comments="#"
+    local string="\"'"
+    if [[ "$ext" =~ ^ini|env|toml|yml|yaml$ ]]; then
+        endline='#'
+    fi
+    if [[ "$ext" =~ ^ini|env$ ]]; then
+        comments="[;#]"
+    fi
+    if [[ "php" == "$ext" ]] || [[ "$ext" == "js" ]]; then
+        comments="//"
+    fi
+    local list='\[\s*['$string']?\w+['$string']?\]'
+    local var_part='^\s*((const|var|let)\s+)?\$?(\w+('$list')*(->|\.|\[))*\s*'
+    var_part+="[$string]?${key}[$string]?"
+    var_part+='\s*\]?\s*'
+    var_part+="($assign)"
+    var_part+='\s*'
+
+    # Extract the part after assignation sign
+    local expression_with_comment="$((tail +$line_number ${file} | grep -i -o -P $var_part'\K.*$' || echo YNH_NULL) | head -n1)"
+    if [[ "$expression_with_comment" == "YNH_NULL" ]]; then
+        set -o xtrace # set -x
+        echo YNH_NULL
+        return 0
+    fi
+
+    # Remove comments if needed
+    local expression="$(echo "$expression_with_comment" | sed "s@${comments}[^$string]*\$@@g" | sed "s@\s*[$endline]*\s*]*\$@@")"
+
+    local first_char="${expression:0:1}"
+    if [[ "$first_char" == '"' ]]; then
+        echo "$expression" | grep -m1 -o -P '"\K([^"](\\")?)*[^\\](?=")' | head -n1 | sed 's/\\"/"/g'
+    elif [[ "$first_char" == "'" ]]; then
+        echo "$expression" | grep -m1 -o -P "'\K([^'](\\\\')?)*[^\\\\](?=')" | head -n1 | sed "s/\\\\'/'/g"
+    else
+        echo "$expression"
+    fi
+    set -o xtrace # set -x
+}
+
+# Set a value into heterogeneous file (yaml, json, php, python...)
+#
+# usage: ynh_write_var_in_file --file=PATH --key=KEY --value=VALUE
+# | arg: -f, --file=     - the path to the file
+# | arg: -k, --key=     - the key to set
+# | arg: -v, --value=     - the value to set
+# | arg: -a, --after=     - the line just before the key (in case of multiple lines with the name of the key in the file)
+#
+# Requires YunoHost version 4.3 or higher.
+ynh_write_var_in_file() {
+    # ============ Argument parsing =============
+    local -A args_array=([f]=file= [k]=key= [v]=value= [a]=after=)
+    local file
+    local key
+    local value
+    local after
+    ynh_handle_getopts_args "$@"
+    after="${after:-}"
+    # ===========================================
+
+    [[ -f $file ]] || ynh_die "File $file does not exists"
+
+    set +o xtrace # set +x
+
+    # Get the line number after which we search for the variable
+    local after_line_number=1
+    if [[ -n "$after" ]]; then
+        after_line_number=$(grep -m1 -n $after $file | cut -d: -f1)
+        if [[ -z "$after_line_number" ]]; then
+            set -o xtrace # set -x
+            return 1
+        fi
+    fi
+
+    local filename="$(basename -- "$file")"
+    local ext="${filename##*.}"
+    local endline=',;'
+    local assign="=>|:|="
+    local comments="#"
+    local string="\"'"
+    if [[ "$ext" =~ ^ini|env|toml|yml|yaml$ ]]; then
+        endline='#'
+    fi
+    if [[ "$ext" =~ ^ini|env$ ]]; then
+        comments="[;#]"
+    fi
+    if [[ "php" == "$ext" ]] || [[ "$ext" == "js" ]]; then
+        comments="//"
+    fi
+    local list='\[\s*['$string']?\w+['$string']?\]'
+    local var_part='^\s*((const|var|let)\s+)?\$?(\w+('$list')*(->|\.|\[))*\s*'
+    var_part+="[$string]?${key}[$string]?"
+    var_part+='\s*\]?\s*'
+    var_part+="($assign)"
+    var_part+='\s*'
+
+    # Extract the part after assignation sign
+    local expression_with_comment="$((tail +$after_line_number ${file} | grep -i -o -P $var_part'\K.*$' || echo YNH_NULL) | head -n1)"
+    if [[ "$expression_with_comment" == "YNH_NULL" ]]; then
+        set -o xtrace # set -x
+        return 1
+    fi
+    local value_line_number="$(tail +$after_line_number ${file} | grep -m1 -n -i -P $var_part'\K.*$' | cut -d: -f1)"
+    value_line_number=$((after_line_number + value_line_number))
+    local range="${after_line_number},${value_line_number} "
+
+    # Remove comments if needed
+    local expression="$(echo "$expression_with_comment" | sed "s@${comments}[^$string]*\$@@g" | sed "s@\s*[$endline]*\s*]*\$@@")"
+    endline=${expression_with_comment#"$expression"}
+    endline="$(echo "$endline" | sed 's/\\/\\\\/g')"
+    value="$(echo "$value" | sed 's/\\/\\\\/g')"
+    value=${value//&/"\&"}
+    local first_char="${expression:0:1}"
+    delimiter=$'\001'
+    if [[ "$first_char" == '"' ]]; then
+        # \ and sed is quite complex you need 2 \\ to get one in a sed
+        # So we need \\\\ to go through 2 sed
+        value="$(echo "$value" | sed 's/"/\\\\"/g')"
+        sed -ri "${range}s$delimiter"'(^'"${var_part}"'")([^"]|\\")*("[\s;,]*)(\s*'$comments'.*)?$'$delimiter'\1'"${value}"'"'"${endline}${delimiter}i" ${file}
+    elif [[ "$first_char" == "'" ]]; then
+        # \ and sed is quite complex you need 2 \\ to get one in a sed
+        # However double quotes implies to double \\ to
+        # So we need \\\\\\\\ to go through 2 sed and 1 double quotes str
+        value="$(echo "$value" | sed "s/'/\\\\\\\\'/g")"
+        sed -ri "${range}s$delimiter(^${var_part}')([^']|\\')*('"'[\s,;]*)(\s*'$comments'.*)?$'$delimiter'\1'"${value}'${endline}${delimiter}i" ${file}
+    else
+        if [[ "$value" == *"'"* ]] || [[ "$value" == *'"'* ]] || [[ "$ext" =~ ^php|py|json|js$ ]]; then
+            value='\"'"$(echo "$value" | sed 's/"/\\\\"/g')"'\"'
+        fi
+        if [[ "$ext" =~ ^yaml|yml$ ]]; then
+            value=" $value"
+        fi
+        sed -ri "${range}s$delimiter(^${var_part}).*\$$delimiter\1${value}${endline}${delimiter}i" ${file}
+    fi
+    set -o xtrace # set -x
+}

helpers/helpers.v2.1.d/user

@@ -0,0 +1,182 @@
+#!/bin/bash
+
+# Check if a YunoHost user exists
+#
+# usage: ynh_user_exists --username=username
+# | arg: -u, --username=    - the username to check
+# | ret: 0 if the user exists, 1 otherwise.
+#
+# example: ynh_user_exists 'toto' || echo "User does not exist"
+#
+# Requires YunoHost version 2.2.4 or higher.
+ynh_user_exists() {
+    # ============ Argument parsing =============
+    local -A args_array=([u]=username=)
+    local username
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    yunohost user list --output-as json --quiet | jq -e ".users.\"${username}\"" >/dev/null
+}
+
+# Retrieve a YunoHost user information
+#
+# usage: ynh_user_get_info --username=username --key=key
+# | arg: -u, --username=    - the username to retrieve info from
+# | arg: -k, --key=         - the key to retrieve
+# | ret: the value associate to that key
+#
+# example: mail=$(ynh_user_get_info --username="toto" --key=mail)
+#
+# Requires YunoHost version 2.2.4 or higher.
+ynh_user_get_info() {
+    # ============ Argument parsing =============
+    local -A args_array=([u]=username= [k]=key=)
+    local username
+    local key
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    yunohost user info "$username" --output-as json --quiet | jq -r ".$key"
+}
+
+# Get the list of YunoHost users
+#
+# usage: ynh_user_list
+# | ret: one username per line as strings
+#
+# example: for u in $(ynh_user_list); do ... ; done
+#
+# Requires YunoHost version 2.4.0 or higher.
+ynh_user_list() {
+    yunohost user list --output-as json --quiet | jq -r ".users | keys[]"
+}
+
+# Check if a user exists on the system
+#
+# [packagingv1]
+#
+# usage: ynh_system_user_exists --username=username
+# | arg: -u, --username=    - the username to check
+# | ret: 0 if the user exists, 1 otherwise.
+#
+# Requires YunoHost version 2.2.4 or higher.
+ynh_system_user_exists() {
+    # ============ Argument parsing =============
+    local -A args_array=([u]=username=)
+    local username
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    getent passwd "$username" &>/dev/null
+}
+
+# Check if a group exists on the system
+#
+# [packagingv1]
+#
+# usage: ynh_system_group_exists --group=group
+# | arg: -g, --group=   - the group to check
+# | ret: 0 if the group exists, 1 otherwise.
+#
+# Requires YunoHost version 3.5.0.2 or higher.
+ynh_system_group_exists() {
+    # ============ Argument parsing =============
+    local -A args_array=([g]=group=)
+    local group
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    getent group "$group" &>/dev/null
+}
+
+# Create a system user
+#
+# [packagingv1]
+#
+# usage: ynh_system_user_create --username=user_name [--home_dir=home_dir] [--use_shell] [--groups="group1 group2"]
+# | arg: -u, --username=    - Name of the system user that will be create
+# | arg: -h, --home_dir=    - Path of the home dir for the user. Usually the final path of the app. If this argument is omitted, the user will be created without home
+# | arg: -s, --use_shell    - Create a user using the default login shell if present. If this argument is omitted, the user will be created with /usr/sbin/nologin shell
+# | arg: -g, --groups       - Add the user to system groups. Typically meant to add the user to the ssh.app / sftp.app group (e.g. for borgserver, my_webapp)
+#
+# Create a nextcloud user with no home directory and /usr/sbin/nologin login shell (hence no login capability) :
+# ```
+# ynh_system_user_create --username=nextcloud
+# ```
+# Create a discourse user using /var/www/discourse as home directory and the default login shell :
+# ```
+# ynh_system_user_create --username=discourse --home_dir=/var/www/discourse --use_shell
+# ```
+#
+# Requires YunoHost version 2.6.4 or higher.
+ynh_system_user_create() {
+    # ============ Argument parsing =============
+    local -A args_array=([u]=username= [h]=home_dir= [s]=use_shell [g]=groups=)
+    local username
+    local home_dir
+    local use_shell
+    local groups
+    ynh_handle_getopts_args "$@"
+    use_shell="${use_shell:-0}"
+    home_dir="${home_dir:-}"
+    groups="${groups:-}"
+    # ===========================================
+
+    if ! ynh_system_user_exists --username="$username"; then # Check if the user exists on the system
+        # If the user doesn't exist
+        if [ -n "$home_dir" ]; then # If a home dir is mentioned
+            local user_home_dir="--home-dir $home_dir"
+        else
+            local user_home_dir="--no-create-home"
+        fi
+        if [ $use_shell -eq 1 ]; then # If we want a shell for the user
+            local shell=""            # Use default shell
+        else
+            local shell="--shell /usr/sbin/nologin"
+        fi
+        useradd $user_home_dir --system --user-group $username $shell || ynh_die "Unable to create $username system account"
+    fi
+
+    local group
+    for group in $groups; do
+        usermod -a -G "$group" "$username"
+    done
+}
+
+# Delete a system user
+#
+# [packagingv1]
+#
+# usage: ynh_system_user_delete --username=user_name
+# | arg: -u, --username=    - Name of the system user that will be create
+#
+# Requires YunoHost version 2.6.4 or higher.
+ynh_system_user_delete() {
+    # ============ Argument parsing =============
+    local -A args_array=([u]=username=)
+    local username
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    # Check if the user exists on the system
+    if ynh_system_user_exists --username="$username"; then
+        deluser $username
+    else
+        ynh_print_warn "The user $username was not found"
+    fi
+
+    # Check if the group exists on the system
+    if ynh_system_group_exists --group="$username"; then
+        delgroup $username
+    fi
+}
+
+# Execute a command after sudoing as $app
+#
+# Note that exported bash env variables are kept (using -E option of sudo)
+#
+# usage: ynh_exec_as_app COMMAND [ARG ...]
+ynh_exec_as_app() {
+    sudo -E -u"$app" "$@"
+}

helpers/helpers.v2.1.d/utils

@@ -0,0 +1,629 @@
+#!/bin/bash
+
+YNH_APP_BASEDIR=${YNH_APP_BASEDIR:-$(realpath ..)}
+
+# Handle script crashes / failures
+#
+# [internal]
+#
+# usage:
+# ynh_exit_properly is used only by the helper ynh_abort_if_errors.
+# You should not use it directly.
+# Instead, add to your script:
+# ynh_clean_setup () {
+#        instructions...
+# }
+#
+# This function provide a way to clean some residual of installation that not managed by remove script.
+#
+# It prints a warning to inform that the script was failed, and execute the ynh_clean_setup function if used in the app script
+#
+# Requires YunoHost version 2.6.4 or higher.
+ynh_exit_properly() {
+    local exit_code=$?
+
+    if [[ "${YNH_APP_ACTION:-}" =~ ^install$|^upgrade$|^restore$ ]]
+    then
+        rm -rf "/var/cache/yunohost/download/"
+    fi
+
+    if [ "$exit_code" -eq 0 ]; then
+        exit 0 # Exit without error if the script ended correctly
+    fi
+
+    trap '' EXIT # Ignore new exit signals
+    # Do not exit anymore if a command fail or if a variable is empty
+    set +o errexit # set +e
+    set +o nounset # set +u
+
+    # Small tempo to avoid the next message being mixed up with other DEBUG messages
+    sleep 0.5
+
+    if type -t ynh_clean_setup >/dev/null; then # Check if the function exist in the app script.
+        ynh_clean_setup                         # Call the function to do specific cleaning for the app.
+    fi
+
+    # Exit with error status
+    # We don't call ynh_die basically to avoid unecessary 10-ish
+    # debug lines about parsing args and stuff just to exit 1..
+    exit 1
+}
+
+# Exits if an error occurs during the execution of the script.
+#
+# [packagingv1]
+#
+# usage: ynh_abort_if_errors
+#
+# This configure the rest of the script execution such that, if an error occurs
+# or if an empty variable is used, the execution of the script stops immediately
+# and a call to `ynh_clean_setup` is triggered if it has been defined by your script.
+#
+# Requires YunoHost version 2.6.4 or higher.
+ynh_abort_if_errors() {
+    set -o errexit              # set -e; Exit if a command fail
+    set -o nounset              # set -u; And if a variable is used unset
+    trap ynh_exit_properly EXIT # Capturing exit signals on shell script
+}
+
+# When running an app script, auto-enable ynh_abort_if_errors except for remove script
+if [[ "${YNH_CONTEXT:-}" != "regenconf" ]] && [[ "${YNH_APP_ACTION}" != "remove" ]]
+then
+    ynh_abort_if_errors
+fi
+
+# Download, check integrity, uncompress and patch upstream sources
+#
+# usage: ynh_setup_source --dest_dir=dest_dir [--source_id=source_id] [--keep="file1 file2"] [--full_replace]
+# | arg: -d, --dest_dir=     - Directory where to setup sources
+# | arg: -s, --source_id=    - Name of the source, defaults to `main` (when the sources resource exists in manifest.toml) or (legacy) `app` otherwise
+# | arg: -k, --keep=         - Space-separated list of files/folders that will be backup/restored in $dest_dir, such as a config file you don't want to overwrite. For example 'conf.json secrets.json logs' (no trailing `/` for folders)
+# | arg: -r, --full_replace= - Remove previous sources before installing new sources  (can be 1 or 0, default to 0)
+#
+# #### New 'sources' resources
+#
+# (See also the resources documentation which may be more complete?)
+#
+# This helper will read infos from the 'sources' resources in the manifest.toml of the app
+# and expect a structure like:
+#
+# ```toml
+# [resources.sources]
+#     [resources.sources.main]
+#     url = "https://some.address.to/download/the/app/archive"
+#     sha256 = "0123456789abcdef"    # The sha256 sum of the asset obtained from the URL
+# ```
+#
+# ##### Optional flags
+#
+# ```text
+# format    = "tar.gz"/xz/bz2    # automatically guessed from the extension of the URL, but can be set explicitly. Will use `tar` to extract
+#             "zip"              # automatically guessed from the extension of the URL, but can be set explicitly. Will use `unzip` to extract
+#             "docker"           # useful to extract files from an already-built docker image (instead of rebuilding them locally). Will use `docker-image-extract` to extract
+#             "whatever"         # an arbitrary value, not really meaningful except to imply that the file won't be extracted
+#
+# in_subdir = true    # default, there's an intermediate subdir in the archive before accessing the actual files
+#             false   # sources are directly in the archive root
+#             n       # (special cases) an integer representing a number of subdirs levels to get rid of
+#
+# extract   = true    # default if file is indeed an archive such as .zip, .tar.gz, .tar.bz2, ...
+#           = false   # default if file 'format' is not set and the file is not to be extracted because it is not an archive but a script or binary or whatever asset.
+#                     #    in which case the file will only be `mv`ed to the location possibly renamed using the `rename` value
+#
+# rename    = "whatever_your_want"   # to be used for convenience when `extract` is false and the default name of the file is not practical
+# platform  = "linux/amd64"          # (defaults to "linux/$YNH_ARCH") to be used in conjonction with `format = "docker"` to specify which architecture to extract for
+# ```
+#
+# You may also define assets url and checksum per-architectures such as:
+# ```toml
+# [resources.sources]
+#     [resources.sources.main]
+#     amd64.url = "https://some.address.to/download/the/app/archive/when/amd64"
+#     amd64.sha256 = "0123456789abcdef"
+#     armhf.url = "https://some.address.to/download/the/app/archive/when/armhf"
+#     armhf.sha256 = "fedcba9876543210"
+# ```
+#
+# In which case ynh_setup_source --dest_dir="$install_dir" will automatically pick the appropriate source depending on the arch
+#
+# The helper will:
+# - Download the specific URL if there is no local archive
+# - Check the integrity with the specific sha256 sum
+# - Uncompress the archive to `$dest_dir`.
+#   - If `in_subdir` is true, the first level directory of the archive will be removed.
+#   - If `in_subdir` is a numeric value, the N first level directories will be removed.
+# - Patches named `patches/${src_id}-*.patch` will be applied to `$dest_dir`
+#
+# Requires YunoHost version 2.6.4 or higher.
+ynh_setup_source() {
+    # ============ Argument parsing =============
+    local -A args_array=([d]=dest_dir= [s]=source_id= [k]=keep= [r]=full_replace)
+    local dest_dir
+    local source_id
+    local keep
+    local full_replace
+    ynh_handle_getopts_args "$@"
+    keep="${keep:-}"
+    full_replace="${full_replace:-0}"
+    source_id="${source_id:-main}"
+    # ===========================================
+
+    local sources_json=$(ynh_read_manifest "resources.sources[\"$source_id\"]")
+    if jq -re ".url" <<< "$sources_json"
+    then
+        local arch_prefix=""
+    else
+        local arch_prefix=".$YNH_ARCH"
+    fi
+
+    local src_url="$(jq -r "$arch_prefix.url" <<< "$sources_json" | sed 's/^null$//')"
+    local src_sum="$(jq -r "$arch_prefix.sha256" <<< "$sources_json" | sed 's/^null$//')"
+    local src_sumprg="sha256sum"
+    local src_format="$(jq -r ".format" <<< "$sources_json" | sed 's/^null$//')"
+    local src_in_subdir="$(jq -r ".in_subdir" <<< "$sources_json" | sed 's/^null$//')"
+    src_in_subdir=${src_in_subdir:-true}
+    local src_extract="$(jq -r ".extract" <<< "$sources_json" | sed 's/^null$//')"
+    local src_platform="$(jq -r ".platform" <<< "$sources_json" | sed 's/^null$//')"
+    local src_rename="$(jq -r ".rename" <<< "$sources_json" | sed 's/^null$//')"
+
+    [[ -n "$src_url" ]] || ynh_die "No URL defined for source $source_id$arch_prefix ?"
+    [[ -n "$src_sum" ]] || ynh_die "No sha256 sum defined for source $source_id$arch_prefix ?"
+
+    if [[ -z "$src_format" ]]
+    then
+        if [[ "$src_url" =~ ^.*\.zip$ ]] || [[ "$src_url" =~ ^.*/zipball/.*$ ]]
+        then
+            src_format="zip"
+        elif [[ "$src_url" =~ ^.*\.tar\.gz$ ]] || [[ "$src_url" =~ ^.*\.tgz$ ]] || [[ "$src_url" =~ ^.*/tar\.gz/.*$ ]] || [[ "$src_url" =~ ^.*/tarball/.*$ ]]
+        then
+            src_format="tar.gz"
+        elif [[ "$src_url" =~ ^.*\.tar\.xz$ ]]
+        then
+            src_format="tar.xz"
+        elif [[ "$src_url" =~ ^.*\.tar\.bz2$ ]]
+        then
+            src_format="tar.bz2"
+        elif [[ -z "$src_extract" ]]
+        then
+            src_extract="false"
+        fi
+    fi
+
+    src_format=${src_format:-tar.gz}
+    src_format=$(echo "$src_format" | tr '[:upper:]' '[:lower:]')
+    src_extract=${src_extract:-true}
+
+    if [[ "$src_extract" != "true" ]] && [[ "$src_extract" != "false" ]]
+    then
+        ynh_die "For source $source_id, expected either 'true' or 'false' for the extract parameter"
+    fi
+
+    # (Unused?) mecanism where one can have the file in a special local cache to not have to download it...
+    local local_src="/opt/yunohost-apps-src/${YNH_APP_ID}/${source_id}"
+
+    # Gotta use this trick with 'dirname' because source_id may contain slashes x_x
+    mkdir -p $(dirname /var/cache/yunohost/download/${YNH_APP_ID}/${source_id})
+    src_filename="/var/cache/yunohost/download/${YNH_APP_ID}/${source_id}"
+
+    if [ "$src_format" = "docker" ]; then
+        src_platform="${src_platform:-"linux/$YNH_ARCH"}"
+    else
+        if test -e "$local_src"; then
+            cp $local_src $src_filename
+        fi
+
+        [ -n "$src_url" ] || ynh_die "Couldn't parse SOURCE_URL from $src_file_path ?"
+
+        # If the file was prefetched but somehow doesn't match the sum, rm and redownload it
+        if [ -e "$src_filename" ] && ! echo "${src_sum} ${src_filename}" | ${src_sumprg} --check --status
+        then
+            rm -f "$src_filename"
+        fi
+
+        # Only redownload the file if it wasnt prefetched
+        if [ ! -e "$src_filename" ]
+        then
+            # NB. we have to declare the var as local first,
+            # otherwise 'local foo=$(false) || echo 'pwet'" does'nt work
+            # because local always return 0 ...
+            local out
+            # Timeout option is here to enforce the timeout on dns query and tcp connect (c.f. man wget)
+            out=$(wget --tries 3 --no-dns-cache --timeout 900 --no-verbose --output-document=$src_filename $src_url 2>&1) \
+                || ynh_die "$out"
+        fi
+
+        # Check the control sum
+        if ! echo "${src_sum} ${src_filename}" | ${src_sumprg} --check --status
+        then
+            local actual_sum="$(${src_sumprg} ${src_filename} | cut --delimiter=' ' --fields=1)"
+            local actual_size="$(du -hs ${src_filename} | cut --fields=1)"
+            rm -f ${src_filename}
+            ynh_die "Corrupt source for ${src_url}: Expected sha256sum to be ${src_sum} but got ${actual_sum} (size: ${actual_size})."
+        fi
+    fi
+
+    # Keep files to be backup/restored at the end of the helper
+    # Assuming $dest_dir already exists
+    rm -rf /var/cache/yunohost/files_to_keep_during_setup_source/
+    if [ -n "$keep" ] && [ -e "$dest_dir" ]; then
+        local keep_dir=/var/cache/yunohost/files_to_keep_during_setup_source/${YNH_APP_ID}
+        mkdir -p $keep_dir
+        local stuff_to_keep
+        for stuff_to_keep in $keep; do
+            if [ -e "$dest_dir/$stuff_to_keep" ]; then
+                mkdir --parents "$(dirname "$keep_dir/$stuff_to_keep")"
+                cp --archive "$dest_dir/$stuff_to_keep" "$keep_dir/$stuff_to_keep"
+            fi
+        done
+    fi
+
+    if [ "$full_replace" -eq 1 ]; then
+        ynh_safe_rm "$dest_dir"
+    fi
+
+    # Extract source into the app dir
+    mkdir --parents "$dest_dir"
+
+    if [ -n "${install_dir:-}" ] && [ "$dest_dir" == "$install_dir" ]; then
+        _ynh_apply_default_permissions $dest_dir
+    fi
+
+    if [[ "$src_extract" == "false" ]]; then
+        if [[ -z "$src_rename" ]]
+        then
+            mv $src_filename $dest_dir
+        else
+            mv $src_filename $dest_dir/$src_rename
+        fi
+    elif [[ "$src_format" == "docker" ]]; then
+        "$YNH_HELPERS_DIR/vendor/docker-image-extract/docker-image-extract" -p $src_platform -o $dest_dir $src_url 2>&1
+    elif [[ "$src_format" == "zip" ]]; then
+        # Zip format
+        # Using of a temp directory, because unzip doesn't manage --strip-components
+        if $src_in_subdir; then
+            local tmp_dir=$(mktemp --directory)
+            unzip -quo $src_filename -d "$tmp_dir"
+            cp --archive $tmp_dir/*/. "$dest_dir"
+            ynh_safe_rm "$tmp_dir"
+        else
+            unzip -quo $src_filename -d "$dest_dir"
+        fi
+        ynh_safe_rm "$src_filename"
+    else
+        local strip=""
+        if [ "$src_in_subdir" != "false" ]; then
+            if [ "$src_in_subdir" == "true" ]; then
+                local sub_dirs=1
+            else
+                local sub_dirs="$src_in_subdir"
+            fi
+            strip="--strip-components $sub_dirs"
+        fi
+        if [[ "$src_format" =~ ^tar.gz|tar.bz2|tar.xz$ ]]; then
+            tar --extract --file=$src_filename --directory="$dest_dir" $strip
+        else
+            ynh_die "Archive format unrecognized."
+        fi
+        ynh_safe_rm "$src_filename"
+    fi
+
+    # Apply patches
+    if [ -d "$YNH_APP_BASEDIR/patches/" ]; then
+        local patches_folder=$(realpath $YNH_APP_BASEDIR/patches/)
+        # Check if any file matching the pattern exists, cf https://stackoverflow.com/a/34195247
+        if compgen -G "$patches_folder/${source_id}-*.patch" >/dev/null; then
+            pushd "$dest_dir"
+            for p in $patches_folder/${source_id}-*.patch; do
+                echo $p
+                patch --strip=1 <$p || ynh_print_warn "Packagers /!\\ patch $p failed to apply"
+            done
+            popd
+        fi
+    fi
+
+    # Keep files to be backup/restored at the end of the helper
+    # Assuming $dest_dir already exists
+    if [ -n "$keep" ]; then
+        local keep_dir=/var/cache/yunohost/files_to_keep_during_setup_source/${YNH_APP_ID}
+        local stuff_to_keep
+        for stuff_to_keep in $keep; do
+            if [ -e "$keep_dir/$stuff_to_keep" ]; then
+                mkdir --parents "$(dirname "$dest_dir/$stuff_to_keep")"
+
+                # We add "--no-target-directory" (short option is -T) to handle the special case
+                # when we "keep" a folder, but then the new setup already contains the same dir (but possibly empty)
+                # in which case a regular "cp" will create a copy of the directory inside the directory ...
+                # resulting in something like /var/www/$app/data/data instead of /var/www/$app/data
+                # cf https://unix.stackexchange.com/q/94831 for a more elaborate explanation on the option
+                cp --archive --no-target-directory "$keep_dir/$stuff_to_keep" "$dest_dir/$stuff_to_keep"
+            fi
+        done
+    fi
+    rm -rf /var/cache/yunohost/files_to_keep_during_setup_source/
+}
+
+# Curl abstraction to help with POST requests to local pages (such as installation forms)
+#
+# usage: ynh_local_curl "page_uri" "key1=value1" "key2=value2" ...
+# | arg: page_uri    - Path (relative to `$path`) of the page where POST data will be sent
+# | arg: key1=value1 - (Optionnal) POST key and corresponding value
+# | arg: key2=value2 - (Optionnal) Another POST key and corresponding value
+# | arg: ...         - (Optionnal) More POST keys and values
+#
+# example: ynh_local_curl "/install.php?installButton" "foo=$var1" "bar=$var2"
+#
+# For multiple calls, cookies are persisted between each call for the same app
+#
+# `$domain` and `$path` should be defined externally (and correspond to the domain.tld and the /path (of the app?))
+#
+# Requires YunoHost version 2.6.4 or higher.
+ynh_local_curl() {
+    # Define url of page to curl
+    local local_page=$(ynh_normalize_url_path $1)
+    local full_path=$path$local_page
+
+    if [ "${path}" == "/" ]; then
+        full_path=$local_page
+    fi
+
+    local full_page_url=https://localhost$full_path
+
+    # Concatenate all other arguments with '&' to prepare POST data
+    local POST_data=""
+    local arg=""
+    for arg in "${@:2}"; do
+        POST_data="${POST_data}${arg}&"
+    done
+    if [ -n "$POST_data" ]; then
+        # Add --data arg and remove the last character, which is an unecessary '&'
+        POST_data="--data ${POST_data::-1}"
+    fi
+
+    # Wait untils nginx has fully reloaded (avoid curl fail with http2)
+    sleep 2
+
+    local cookiefile=/tmp/ynh-$app-cookie.txt
+    touch $cookiefile
+    chown root $cookiefile
+    chmod 700 $cookiefile
+
+    # Temporarily enable visitors if needed...
+    local visitors_enabled=$(ynh_permission_has_user --permission="main" --user="visitors" && echo yes || echo no)
+    if [[ $visitors_enabled == "no" ]]; then
+        ynh_permission_update --permission="main" --add="visitors"
+    fi
+
+    # Curl the URL
+    curl --silent --show-error --insecure --location --header "Host: $domain" --resolve $domain:443:127.0.0.1 $POST_data "$full_page_url" --cookie-jar $cookiefile --cookie $cookiefile
+
+    if [[ $visitors_enabled == "no" ]]; then
+        ynh_permission_update --permission="main" --remove="visitors"
+    fi
+}
+
+_acceptable_path_to_delete() {
+    local file=$1
+
+    local forbidden_paths=$(ls -d / /* /{var,home,usr}/* /etc/{default,sudoers.d,yunohost,cron*} /etc/yunohost/{apps,domains,hooks.d} /opt/yunohost 2> /dev/null)
+
+    # Legacy : A couple apps still have data in /home/$app ...
+    if [[ -n "${app:-}" ]]
+    then
+        forbidden_paths=$(echo "$forbidden_paths" | grep -v "/home/$app")
+    fi
+
+    # Use realpath to normalize the path ..
+    # i.e convert ///foo//bar//..///baz//// to /foo/baz
+    file=$(realpath --no-symlinks "$file")
+    if [ -z "$file" ] || grep -q -x -F "$file" <<< "$forbidden_paths"; then
+        return 1
+    else
+        return 0
+    fi
+}
+
+# Remove a file or a directory, checking beforehand that it's not a disastrous location to rm such as entire /var or /home
+#
+# usage: ynh_safe_rm path_to_remove
+#
+# Requires YunoHost version 2.6.4 or higher.
+ynh_safe_rm() {
+    local target="$1"
+    set +o xtrace # set +x
+
+    if [ $# -ge 2 ]; then
+        ynh_print_warn "/!\ Packager ! You provided more than one argument to ynh_safe_rm but it will be ignored... Use this helper with one argument at time."
+    fi
+
+    if [[ -z "$target" ]]; then
+        ynh_print_warn "ynh_safe_rm called with empty argument, ignoring."
+    elif [[ ! -e $target ]]; then
+        ynh_print_info "'$target' wasn't deleted because it doesn't exist."
+    elif ! _acceptable_path_to_delete "$target"; then
+        ynh_print_warn "Not deleting '$target' because it is not an acceptable path to delete."
+    else
+        rm --recursive "$target"
+    fi
+
+    set -o xtrace # set -x
+}
+
+# Read the value of a key in the app's manifest
+#
+# usage: ynh_read_manifest "key"
+# | arg: key - Name of the key to find
+# | ret: the value associate to that key
+#
+# Requires YunoHost version 3.5.0 or higher.
+ynh_read_manifest() {
+    cat $YNH_APP_BASEDIR/manifest.toml | toml_to_json | jq ".$1" --raw-output
+}
+
+# Return the app upstream version, deduced from `$YNH_APP_MANIFEST_VERSION` and strippig the `~ynhX` part
+#
+# usage: ynh_app_upstream_version
+# | ret: the version number of the upstream app
+#
+# For example, if the manifest contains `4.3-2~ynh3` the function will return `4.3-2`
+#
+# Requires YunoHost version 3.5.0 or higher.
+ynh_app_upstream_version() {
+    echo "${$YNH_APP_MANIFEST_VERSION/~ynh*/}"
+}
+
+# Return 0 if the "upstream" part of the version changed, or 1 otherwise (ie only the ~ynh suffix changed)
+#
+# usage: if ynh_app_upstream_version_changed; then ...
+ynh_app_upstream_version_changed() {
+    # "UPGRADE_PACKAGE" means only the ~ynh prefix changed
+    [[ "$YNH_APP_UPGRADE_TYPE" == "UPGRADE_PACKAGE" ]] && return 1 || return 0
+}
+
+# Compare the current package version is strictly lower than another version given as an argument
+#
+# example: if ynh_app_upgrading_from_version_before 2.3.2~ynh1; then ...
+#
+# Requires YunoHost version 11.2 or higher.
+ynh_app_upgrading_from_version_before() {
+    local version=$1
+    [[ $version =~ '~ynh' ]] || ynh_die "Invalid argument for version, should include the ~ynhX prefix"
+
+    dpkg --compare-versions $YNH_APP_CURRENT_VERSION lt $version
+}
+
+# Compare the current package version is lower or equal to another version given as an argument
+#
+# example: if ynh_app_upgrading_from_version_before_or_equal_to 2.3.2~ynh1; then ...
+#
+# Requires YunoHost version 11.2 or higher.
+ynh_app_upgrading_from_version_before_or_equal_to() {
+    local version=$1
+    [[ $version =~ '~ynh' ]] || ynh_die "Invalid argument for version, should include the ~ynhX prefix"
+
+    dpkg --compare-versions $YNH_APP_CURRENT_VERSION le $version
+}
+
+# Check if we should enforce sane default permissions (= disable rwx for 'others')
+# on file/folders handled with ynh_setup_source and ynh_config_add
+#
+# [internal]
+#
+# Having a file others-readable or a folder others-executable(=enterable)
+# is a security risk comparable to "chmod 777"
+#
+# Configuration files may contain secrets. Or even just being able to enter a
+# folder may allow an attacker to do nasty stuff (maybe a file or subfolder has
+# some write permission enabled for 'other' and the attacker may edit the
+# content or create files as leverage for priviledge escalation ...)
+#
+# The sane default should be to set ownership to $app:$app.
+# In specific case, you may want to set the ownership to $app:www-data
+# for example if nginx needs access to static files.
+#
+_ynh_apply_default_permissions() {
+    local target=$1
+
+    chmod o-rwx $target
+    chmod g-w $target
+    chown -R root:root $target
+    if ynh_system_user_exists --username=$app; then
+        chown $app:$app $target
+    fi
+
+    # Crons should be owned by root
+    # Also we don't want systemd conf, nginx conf or others stuff to be owned by the app,
+    # otherwise they could self-edit their own systemd conf and escalate privilege
+    if echo "$target" | grep -q '^/etc/cron\|/etc/php\|/etc/nginx/conf.d\|/etc/fail2ban\|/etc/systemd/system'
+    then
+        chmod 400 $target
+        chown root:root $target
+    fi
+}
+
+int_to_bool() {
+    sed -e 's/^1$/True/g' -e 's/^0$/False/g' -e 's/^true$/True/g' -e 's/^false$/False/g'
+}
+
+toml_to_json() {
+    python3 -c 'import toml, json, sys; print(json.dumps(toml.load(sys.stdin)))'
+}
+
+# Validate an IP address
+#
+# usage: ynh_validate_ip --family=family --ip_address=ip_address
+# | ret: 0 for valid ip addresses, 1 otherwise
+#
+# example: ynh_validate_ip 4 111.222.333.444
+#
+# Requires YunoHost version 2.2.4 or higher.
+ynh_validate_ip() {
+    # ============ Argument parsing =============
+    local -A args_array=([f]=family= [i]=ip_address=)
+    local family
+    local ip_address
+    ynh_handle_getopts_args "$@"
+    # ===========================================
+
+    [ "$family" == "4" ] || [ "$family" == "6" ] || return 1
+
+    # http://stackoverflow.com/questions/319279/how-to-validate-ip-address-in-python#319298
+    python3 /dev/stdin <<EOF
+import socket
+import sys
+family = { "4" : socket.AF_INET, "6" : socket.AF_INET6 }
+try:
+    socket.inet_pton(family["$family"], "$ip_address")
+except socket.error:
+    sys.exit(1)
+sys.exit(0)
+EOF
+}
+
+# Get the total or free amount of RAM+swap on the system
+#
+# [packagingv1]
+#
+# usage: ynh_get_ram [--free|--total]
+# | arg: -f, --free         - Count free RAM+swap
+# | arg: -t, --total        - Count total RAM+swap
+# | ret: the amount of free ram, in MB (MegaBytes)
+#
+# Requires YunoHost version 3.8.1 or higher.
+ynh_get_ram() {
+    # ============ Argument parsing =============
+    local -A args_array=([f]=free [t]=total)
+    local free
+    local total
+    ynh_handle_getopts_args "$@"
+    free=${free:-0}
+    total=${total:-0}
+    # ===========================================
+
+    if [ $free -eq $total ]; then
+        ynh_print_warn "You have to choose --free or --total when using ynh_get_ram"
+        ram=0
+    elif [ $free -eq 1 ]; then
+        local free_ram=$(LC_ALL=C vmstat --stats --unit M | grep "free memory" | awk '{print $1}')
+        local free_swap=$(LC_ALL=C vmstat --stats --unit M | grep "free swap" | awk '{print $1}')
+        local free_ram_swap=$((free_ram + free_swap))
+        local ram=$free_ram_swap
+    elif [ $total -eq 1 ]; then
+        local total_ram=$(LC_ALL=C vmstat --stats --unit M | grep "total memory" | awk '{print $1}')
+        local total_swap=$(LC_ALL=C vmstat --stats --unit M | grep "total swap" | awk '{print $1}')
+        local total_ram_swap=$((total_ram + total_swap))
+        local ram=$total_ram_swap
+    fi
+
+    echo $ram
+}
+
+# Check if the scripts are being run by the package_check in CI
+#
+# usage: ynh_in_ci_tests
+#
+# Return 0 if in CI, 1 otherwise
+#
+# Requires YunoHost version 11.3 or higher.
+ynh_in_ci_tests() {
+    [ "${PACKAGE_CHECK_EXEC:-0}" -eq 1 ]
+}

helpers/helpers.v2.1.d/vendor

@@ -0,0 +1 @@
+../vendor

hooks/conf_regen/01-yunohost

@@ -162,6 +162,8 @@ EOF
     mkdir -p ${pending_dir}/etc/dpkg/origins/
     cp dpkg-origins ${pending_dir}/etc/dpkg/origins/yunohost
 
+    # Remove legacy hackish/clumsy nodejs autoupdate which ends up filling up space with ambiguous upgrades >_>
+    touch "/etc/cron.daily/node_update"
 }
 
 do_post_regen() {

src/app.py

@@ -1486,6 +1486,9 @@ def app_remove(operation_logger, app, purge=False, force_workdir=None):
         for permission_name in user_permission_list(apps=[app])["permissions"].keys():
             permission_delete(permission_name, force=True, sync_perm=False)
 
+    if purge and os.path.exists(f"/var/log/{app}"):
+        shutil.rmtree(f"/var/log/{app}")
+
     if os.path.exists(app_setting_path):
         shutil.rmtree(app_setting_path)
 

src/utils/resources.py

@@ -155,6 +155,19 @@ class AppResource:
         elif manager and manager.current and "version" in manager.current:
             app_upstream_version = manager.current["version"].split("~")[0]
 
+        # FIXME : should use packaging.version to properly parse / compare versions >_>
+        self.helpers_version = None
+        if manager and manager.wanted and manager.wanted.get("integration", {}).get("helpers_version"):
+            self.helpers_version = manager.wanted.get("integration", {}).get("helpers_version")
+        elif manager and manager.current and manager.current.get("integration", {}).get("helpers_version"):
+            self.helpers_version = manager.current.get("integration", {}).get("helpers_version")
+        elif manager and manager.wanted and manager.wanted.get("packaging_format"):
+            self.helpers_version = str(manager.wanted.get("packaging_format"))
+        elif manager and manager.current and manager.current.get("packaging_format"):
+            self.helpers_version = str(manager.current.get("packaging_format"))
+        if not self.helpers_version:
+            self.helpers_version = "1"
+
         replacements: dict[str, str] = {
             "__APP__": self.app,
             "__YNH_ARCH__": system_arch(),
@@ -1182,11 +1195,19 @@ class AptDependenciesAppResource(AppResource):
         }
 
     def provision_or_update(self, context: Dict = {}):
-        script = " ".join(["ynh_install_app_dependencies", *self.packages])
+
+        if float(self.helpers_version) >= 2.1:
+            ynh_apt_install_dependencies = "ynh_apt_install_dependencies"
+            ynh_apt_install_dependencies_from_extra_repository = "ynh_apt_install_dependencies_from_extra_repository"
+        else:
+            ynh_apt_install_dependencies = "ynh_install_app_dependencies"
+            ynh_apt_install_dependencies_from_extra_repository = "ynh_install_extra_app_dependencies"
+
+        script = " ".join([ynh_apt_install_dependencies, *self.packages])
         for repo, values in self.extras.items():
             script += "\n" + " ".join(
                 [
-                    "ynh_install_extra_app_dependencies",
+                    ynh_apt_install_dependencies_from_extra_repository,
                     f"--repo='{values['repo']}'",
                     f"--key='{values['key']}'",
                     f"--package='{' '.join(values['packages'])}'",
@@ -1197,7 +1218,12 @@ class AptDependenciesAppResource(AppResource):
         self._run_script("provision_or_update", script)
 
     def deprovision(self, context: Dict = {}):
-        self._run_script("deprovision", "ynh_remove_app_dependencies")
+        if float(self.helpers_version) >= 2.1:
+            ynh_apt_remove_dependencies = "ynh_apt_remove_dependencies"
+        else:
+            ynh_apt_remove_dependencies = "ynh_remove_app_dependencies"
+
+        self._run_script("deprovision", ynh_apt_remove_dependencies)
 
 
 class PortsResource(AppResource):
@@ -1455,12 +1481,17 @@ class DatabaseAppResource(AppResource):
         db_name = self.get_setting("db_name") or db_user
 
         if self.dbtype == "mysql":
-            self._run_script(
+            db_helper_name = "mysql"
-                "deprovision", f"ynh_mysql_remove_db '{db_name}' '{db_user}'"
-            )
         elif self.dbtype == "postgresql":
+            db_helper_name = "psql"
+        else:
+            raise RuntimeError(f"Invalid dbtype {self.dbtype}")
+
         self._run_script(
-                "deprovision", f"ynh_psql_remove_db '{db_name}' '{db_user}'"
+            "deprovision", f"""
+ynh_{db_helper_name}_database_exists "{db_name}" && ynh_{db_helper_name}_drop_db "{db_name}" || true
+ynh_{db_helper_name}_user_exists "{db_user}" && ynh_{db_helper_name}_drop_user "{db_user}" || true
+"""
         )
 
         self.delete_setting("db_name")