diff --git a/manifest.json b/manifest.json
index c59934c..5ab2c03 100644
--- a/manifest.json
+++ b/manifest.json
@@ -2,9 +2,6 @@
 	"name": "Lutim",
 	"id": "lutim",
 	"packaging_format": 1,
-	"requirements": {
-		"yunohost": ">= 2.4"
-	},
 	"description": {
 		"en": "Self hosting images and sharing anonymous application",
 		"fr": "Application d'hébergement et de partage d'images anonyme"
@@ -16,6 +13,9 @@
 		"name": "Maniack Crudelis et matlink",
 		"email": "maniackc_dev@crudelis.fr"
 	},
+	"requirements": {
+        "yunohost": ">= 2.7.2"
+	},
 	"multi_instance": false,
 	"services": [
 		"nginx"
diff --git a/scripts/_common.sh b/scripts/_common.sh
index 266a076..0c814ff 100755
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -1,125 +1,5 @@
 #!/bin/bash
 
-#=================================================
-#=================================================
-# TESTING
-#=================================================
-#=================================================
-
-ynh_fpm_config () {
-	finalphpconf="/etc/php5/fpm/pool.d/$app.conf"
-	ynh_backup_if_checksum_is_different "$finalphpconf" 1
-	sudo cp ../conf/php-fpm.conf "$finalphpconf"
-	ynh_replace_string "__NAMETOCHANGE__" "$app" "$finalphpconf"
-	ynh_replace_string "__FINALPATH__" "$final_path" "$finalphpconf"
-	ynh_replace_string "__USER__" "$app" "$finalphpconf"
-	sudo chown root: "$finalphpconf"
-	ynh_store_file_checksum "$finalphpconf"
-
-	if [ -e "../conf/php-fpm.ini" ]
-	then
-		finalphpini="/etc/php5/fpm/conf.d/20-$app.ini"
-		ynh_backup_if_checksum_is_different "$finalphpini" 1
-		sudo cp ../conf/php-fpm.ini "$finalphpini"
-		sudo chown root: "$finalphpini"
-		ynh_store_file_checksum "$finalphpini"
-	fi
-
-	sudo systemctl reload php5-fpm
-}
-
-ynh_remove_fpm_config () {
-	ynh_secure_remove "/etc/php5/fpm/pool.d/$app.conf"
-	ynh_secure_remove "/etc/php5/fpm/conf.d/20-$app.ini"
-	sudo systemctl reload php5-fpm
-}
-
-ynh_nginx_config () {
-	finalnginxconf="/etc/nginx/conf.d/$domain.d/$app.conf"
-	ynh_backup_if_checksum_is_different "$finalnginxconf" 1
-	sudo cp ../conf/nginx.conf "$finalnginxconf"
-
-	# To avoid a break by set -u, use a void substitution ${var:-}. If the variable is not set, it's simply set with an empty variable.
-	# Substitute in a nginx config file only if the variable is not empty
-	if test -n "${path_url:-}"; then
-		ynh_replace_string "__PATH__" "$path_url" "$finalnginxconf"
-	fi
-	if test -n "${domain:-}"; then
-		ynh_replace_string "__DOMAIN__" "$domain" "$finalnginxconf"
-	fi
-	if test -n "${port:-}"; then
-		ynh_replace_string "__PORT__" "$port" "$finalnginxconf"
-	fi
-	if test -n "${app:-}"; then
-		ynh_replace_string "__NAME__" "$app" "$finalnginxconf"
-	fi
-	if test -n "${final_path:-}"; then
-		ynh_replace_string "__FINALPATH__" "$final_path" "$finalnginxconf"
-	fi
-	ynh_store_file_checksum "$finalnginxconf"
-
-	sudo systemctl reload nginx
-}
-
-ynh_remove_nginx_config () {
-	ynh_secure_remove "/etc/nginx/conf.d/$domain.d/$app.conf"
-	sudo systemctl reload nginx
-}
-
-ynh_systemd_config () {
-	finalsystemdconf="/etc/systemd/system/$app.service"
-	ynh_backup_if_checksum_is_different "$finalsystemdconf" 1
-	sudo cp ../conf/systemd.service "$finalsystemdconf"
-
-	# To avoid a break by set -u, use a void substitution ${var:-}. If the variable is not set, it's simply set with an empty variable.
-	# Substitute in a nginx config file only if the variable is not empty
-	if test -n "${final_path:-}"; then
-		ynh_replace_string "__FINALPATH__" "$final_path" "$finalsystemdconf"
-	fi
-	if test -n "${app:-}"; then
-		ynh_replace_string "__APP__" "$app" "$finalsystemdconf"
-	fi
-	ynh_store_file_checksum "$finalsystemdconf"
-
-	sudo chown root: "$finalsystemdconf"
-	sudo systemctl enable $app
-	sudo systemctl daemon-reload
-}
-
-ynh_remove_systemd_config () {
-	finalsystemdconf="/etc/systemd/system/$app.service"
-	if [ -e "$finalsystemdconf" ]; then
-		sudo systemctl stop $app
-		sudo systemctl disable $app
-		ynh_secure_remove "$finalsystemdconf"
-	fi
-}
-
-#=================================================
-#=================================================
-
-#=================================================
-# CHECKING
-#=================================================
-
-CHECK_DOMAINPATH () {	# Vérifie la disponibilité du path et du domaine.
-	if sudo yunohost app --help | grep --quiet url-available
-	then
-		# Check availability of a web path
-		ynh_webpath_available $domain $path_url
-		# Register/book a web path for an app
-		ynh_webpath_register $app $domain $path_url
-	else
-		# Use the legacy command
-		sudo yunohost app checkurl $domain$path_url -a $app
-	fi
-}
-
-CHECK_FINALPATH () {	# Vérifie que le dossier de destination n'est pas déjà utilisé.
-	final_path=/var/www/$app
-	test ! -e "$final_path" || ynh_die "This path already contains a folder"
-}
-
 #=================================================
 # DISPLAYING
 #=================================================
@@ -150,35 +30,6 @@ ALL_QUIET () {	# Redirige la sortie standard et d'erreur dans /dev/null
 # BACKUP
 #=================================================
 
-BACKUP_FAIL_UPGRADE () {
-	WARNING echo "Upgrade failed."
-	app_bck=${app//_/-}	# Replace all '_' by '-'
-	if sudo yunohost backup list | grep -q $app_bck-pre-upgrade$backup_number; then	# Vérifie l'existence de l'archive avant de supprimer l'application et de restaurer
-		sudo yunohost app remove $app	# Supprime l'application avant de la restaurer.
-		sudo yunohost backup restore --ignore-hooks $app_bck-pre-upgrade$backup_number --apps $app --force	# Restore the backup if upgrade failed
-		ynh_die "The app was restored to the way it was before the failed upgrade."
-	fi
-}
-
-BACKUP_BEFORE_UPGRADE () {	# Backup the current version of the app, restore it if the upgrade fails
-	backup_number=1
-	old_backup_number=2
-	app_bck=${app//_/-}	# Replace all '_' by '-'
-	if sudo yunohost backup list | grep -q $app_bck-pre-upgrade1; then	# Vérifie l'existence d'une archive déjà numéroté à 1.
-		backup_number=2	# Et passe le numéro de l'archive à 2
-		old_backup_number=1
-	fi
-
-	sudo yunohost backup create --ignore-hooks --apps $app --name $app_bck-pre-upgrade$backup_number	# Créer un backup différent de celui existant.
-	if [ "$?" -eq 0 ]; then	# Si le backup est un succès, supprime l'archive précédente.
-		if sudo yunohost backup list | grep -q $app_bck-pre-upgrade$old_backup_number; then	# Vérifie l'existence de l'ancienne archive avant de la supprimer, pour éviter une erreur.
-			QUIET sudo yunohost backup delete $app_bck-pre-upgrade$old_backup_number
-		fi
-	else	# Si le backup a échoué
-		ynh_die "Backup failed, the upgrade process was aborted."
-	fi
-}
-
 HUMAN_SIZE () {	# Transforme une taille en Ko en une taille lisible pour un humain
 	human=$(numfmt --to=iec --from-unit=1K $1)
 	echo $human
@@ -186,8 +37,8 @@ HUMAN_SIZE () {	# Transforme une taille en Ko en une taille lisible pour un huma
 
 CHECK_SIZE () {	# Vérifie avant chaque backup que l'espace est suffisant
 	file_to_analyse=$1
-	backup_size=$(sudo du --summarize "$file_to_analyse" | cut -f1)
-	free_space=$(sudo df --output=avail "/home/yunohost.backup" | sed 1d)
+	backup_size=$(du --summarize "$file_to_analyse" | cut -f1)
+	free_space=$(df --output=avail "/home/yunohost.backup" | sed 1d)
 
 	if [ $free_space -le $backup_size ]
 	then
@@ -197,14 +48,6 @@ CHECK_SIZE () {	# Vérifie avant chaque backup que l'espace est suffisant
 	fi
 }
 
-# Ce helper est temporaire et sert de remplacement à la véritable fonction ynh_restore_file. Le temps qu'elle arrive...
-ynh_restore_file () {
-	if [ -f "$1" ]; then
-		ynh_die "There is already a file at this path: $1"
-	fi
-	sudo cp -a "${YNH_APP_BACKUP_DIR}$1" "$1"
-}
-
 #=================================================
 # PACKAGE CHECK BYPASSING...
 #=================================================
@@ -217,15 +60,9 @@ IS_PACKAGE_CHECK () {	# Détermine une exécution en conteneur (Non testé)
 # NODEJS
 #=================================================
 
-sudo_path () {
-	sudo env "PATH=$PATH" $@
-}
-
 # INFOS
 # n (Node version management) utilise la variable PATH pour stocker le path de la version de node à utiliser.
 # C'est ainsi qu'il change de version
-# En attendant une généralisation de root, il est possible d'utiliser sudo avec le helper temporaire sudo_path
-# Il permet d'utiliser sudo en gardant le $PATH modifié
 # ynh_install_nodejs installe la version de nodejs demandée en argument, avec n
 # ynh_use_nodejs active une version de nodejs dans le script courant
 # 3 variables sont mises à disposition, et 2 sont stockées dans la config de l'app
@@ -237,53 +74,81 @@ sudo_path () {
 # Dans ce cas, c'est $PATH qui contient le chemin de la version de node. Il doit être propagé sur les autres shell si nécessaire.
 
 n_install_dir="/opt/node_n"
+node_version_path="/opt/node_n/n/versions/node"
+# N_PREFIX est le dossier de n, il doit être chargé dans les variables d'environnement pour n.
+export N_PREFIX="$n_install_dir"
+
 ynh_use_nodejs () {
 	nodejs_version=$(ynh_app_setting_get $app nodejs_version)
 
-	load_n_path="[[ :$PATH: == *\":$n_install_dir/bin:\"* ]] || PATH+=\":$n_install_dir/bin\""
+	load_n_path="[[ :$PATH: == *\":$n_install_dir/bin:\"* ]] || PATH=\"$n_install_dir/bin:$PATH\"; N_PREFIX="$n_install_dir""
 
-	nodejs_use_version="n $nodejs_version"
+	nodejs_use_version="$n_install_dir/bin/n -q $nodejs_version"
 
 	# "Load" a version of node
 	eval $load_n_path; $nodejs_use_version
-	eval $load_n_path; sudo env "PATH=$PATH" $nodejs_use_version
 
 	# Get the absolute path of this version of node
 	nodejs_path="$(n bin $nodejs_version)"
 
 	# Make an alias for node use
 	ynh_node_exec="eval $load_n_path; n use $nodejs_version"
-	sudo_ynh_node_exec="eval $load_n_path; sudo env \"PATH=$PATH\" n use $nodejs_version"
 }
 
 ynh_install_nodejs () {
 	# Use n, https://github.com/tj/n to manage the nodejs versions
-	local nodejs_version="$1"
+	nodejs_version="$1"
 	local n_install_script="https://git.io/n-install"
 
 	# Create $n_install_dir
-	sudo mkdir -p "$n_install_dir"
+	mkdir -p "$n_install_dir"
 
 	# Load n path in PATH
-	PATH+=":$n_install_dir/bin"
+	CLEAR_PATH="$n_install_dir/bin:$PATH"
+	# Remove /usr/local/bin in PATH in case of node has already setup.
+	PATH=$(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
 
 	# If n is not previously setup, install it
 	n --version > /dev/null 2>&1 || \
 	( echo "Installation of N - Node.js version management" >&2; \
-	curl -sL $n_install_script | sudo N_PREFIX="$n_install_dir" bash -s -- -y $nodejs_version )
+	curl -sL $n_install_script | N_PREFIX=$N_PREFIX bash -s -- -y - 2>&1 )
 
-	# Install the requested version of nodejs (except for the first installation of n, which installed the requested version of node.)
-	sudo env "PATH=$PATH" n $nodejs_version
+	# Modify the default N_PREFIX in n script
+	ynh_replace_string "^N_PREFIX=\${N_PREFIX-.*}$" "N_PREFIX=\${N_PREFIX-$N_PREFIX}" "$n_install_dir/bin/n"
 
-	# Use the real installed version. Sometimes slightly different
-	nodejs_version=$(node --version | cut -c2-)
+	# Restore /usr/local/bin in PATH
+	PATH=$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
+	n $nodejs_version
+
+	# Find the last "real" version for this major version of node.
+	real_nodejs_version=$(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 "$YNH_APP_ID:$nodejs_version" | sudo tee --append "$n_install_dir/ynh_app_version"
+	echo "$YNH_APP_ID:$nodejs_version" | tee --append "$n_install_dir/ynh_app_version"
 
 	# Store nodejs_version into the config of this app
 	ynh_app_setting_set $app nodejs_version $nodejs_version
 
+	# Build the update script and set the cronjob
+	ynh_cron_upgrade_node
+
 	ynh_use_nodejs
 }
 
@@ -291,7 +156,7 @@ ynh_remove_nodejs () {
 	ynh_use_nodejs
 
 	# Remove the line for this app
-	sudo sed --in-place "/$YNH_APP_ID:$nodejs_version/d" "$n_install_dir/ynh_app_version"
+	sed --in-place "/$YNH_APP_ID:$nodejs_version/d" "$n_install_dir/ynh_app_version"
 
 	# If none another app uses this version of nodejs, remove it.
 	if ! grep --quiet "$nodejs_version" "$n_install_dir/ynh_app_version"
@@ -303,548 +168,54 @@ ynh_remove_nodejs () {
 	if [ ! -s "$n_install_dir/ynh_app_version" ]
 	then
 		ynh_secure_remove "$n_install_dir"
-		sudo sed --in-place "/N_PREFIX/d" /root/.bashrc
+		ynh_secure_remove "/usr/local/n"
+		sed --in-place "/N_PREFIX/d" /root/.bashrc
 	fi
 }
 
-#=================================================
-#=================================================
-# FUTUR YNH HELPERS
-#=================================================
-# Importer ce fichier de fonction avant celui des helpers officiel
-# Ainsi, les officiels prendront le pas sur ceux-ci le cas échéant
-#=================================================
+ynh_cron_upgrade_node () {
+	# Build the update script
+	cat > "$n_install_dir/node_update.sh" << EOF
+#!/bin/bash
 
-# Normalize the url path syntax
-# Handle the slash at the beginning of path and its absence at ending
-# Return a normalized url path
-#
-# example: 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
-# | arg: url_path_to_normalize - URL path to normalize before using it
-ynh_normalize_url_path () {
-	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 $path_url
-}
+version_path="$node_version_path"
+n_install_dir="$n_install_dir"
 
-# Check if a mysql user exists
-#
-# usage: ynh_mysql_user_exists user
-# | arg: user - the user for which to check existence
-function ynh_mysql_user_exists()
-{
-   local user=$1
-   if [[ -z $(ynh_mysql_execute_as_root "SELECT User from mysql.user WHERE User = '$user';") ]]
-   then
-      return 1
-   else
-      return 0
-   fi
-}
+# Log the date
+date
 
-# Create a database, an user and its password. Then store the password in the app's config
-#
-# After executing this helper, the password of the created database will be available in $db_pwd
-# It will also be stored as "mysqlpwd" into the app settings.
-#
-# usage: ynh_mysql_setup_db user name [pwd]
-# | arg: user - Owner of the database
-# | arg: name - Name of the database
-# | arg: pwd - Password of the database. If not given, a password will be generated
-ynh_mysql_setup_db () {
-	local db_user="$1"
-	local db_name="$2"
-	local new_db_pwd=$(ynh_string_random)	# Generate a random password
-	db_pwd="${3:-$new_db_pwd}"
-	ynh_mysql_create_db "$db_name" "$db_user" "$db_pwd"	# Create the database
-	ynh_app_setting_set $app mysqlpwd $db_pwd	# Store the password in the app's config
-}
+# List all real installed version of node
+all_real_version="\$(find \$version_path/* -maxdepth 0 -type d | sed "s@\$version_path/@@g")"
 
-# Remove a database if it exists, and the associated user
-#
-# usage: ynh_mysql_remove_db user name
-# | arg: user - Owner of the database
-# | arg: name - Name of the database
-ynh_mysql_remove_db () {
-	local db_user="$1"
-	local db_name="$2"
-	local mysql_root_password=$(sudo cat $MYSQL_ROOT_PWD_FILE)
-	if mysqlshow -u root -p$mysql_root_password | grep -q "^| $db_name"; then	# Check if the database exists
-		echo "Removing database $db_name" >&2
-		ynh_mysql_drop_db $db_name	# Remove the database	
-	else
-		echo "Database $db_name not found" >&2
-	fi
+# Keep only the major version number of each line
+all_real_version=\$(echo "\$all_real_version" | sed 's/\..*\$//')
 
-	# Remove mysql user if it exists
-        if $(ynh_mysql_user_exists $db_user); then
-		ynh_mysql_drop_user $db_user
-	fi
-}
+# Remove double entries
+all_real_version=\$(echo "\$all_real_version" | sort --unique)
 
-# Correct the name given in argument for mariadb
-#
-# Avoid invalid name for your database
-#
-# Exemple: dbname=$(ynh_make_valid_dbid $app)
-#
-# usage: ynh_make_valid_dbid name
-# | arg: name - name to correct
-# | ret: the corrected name
-ynh_sanitize_dbid () {
-	dbid=${1//[-.]/_}	# We should avoid having - and . in the name of databases. They are replaced by _
-	echo $dbid
-}
+# Read each major version
+while read version
+do
+	echo "Update of the version \$version"
+	sudo \$n_install_dir/bin/n \$version
 
-# Manage a fail of the script
-#
-# Print a warning to inform that the script was failed
-# Execute the ynh_clean_setup function if used in the app script
-#
-# usage of ynh_clean_setup function
-# This function provide a way to clean some residual of installation that not managed by remove script.
-# To use it, simply add in your script:
-# ynh_clean_setup () {
-#        instructions...
-# }
-# This function is optionnal.
-#
-# Usage: ynh_exit_properly is used only by the helper ynh_abort_if_errors.
-# You must not use it directly.
-ynh_exit_properly () {
-	exit_code=$?
-	if [ "$exit_code" -eq 0 ]; then
-			exit 0	# Exit without error if the script ended correctly
-	fi
+	# 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)
 
-	trap '' EXIT	# Ignore new exit signals
-	set +eu	# Do not exit anymore if a command fail or if a variable is empty
-
-	echo -e "!!\n  $app's script has encountered an error. Its execution was cancelled.\n!!" >&2
-
-	if type -t ynh_clean_setup > /dev/null; then	# Check if the function exist in the app script.
-		ynh_clean_setup	# Call the function to do specific cleaning for the app.
-	fi
-
-	ynh_die	# Exit with error status
-}
-
-# Exit if an error occurs during the execution of the script.
-#
-# Stop immediatly the execution if an error occured or if a empty variable is used.
-# The execution of the script is derivate to ynh_exit_properly function before exit.
-#
-# Usage: ynh_abort_if_errors
-ynh_abort_if_errors () {
-	set -eu	# Exit if a command fail, and if a variable is used unset.
-	trap ynh_exit_properly EXIT	# Capturing exit signals on shell script
-}
-
-# Define and install dependencies with a equivs control file
-# This helper can/should only be called once per app
-#
-# usage: ynh_install_app_dependencies dep [dep [...]]
-# | arg: dep - the package name to install in dependence
-ynh_install_app_dependencies () {
-    dependencies=$@
-    manifest_path="../manifest.json"
-    if [ ! -e "$manifest_path" ]; then
-    	manifest_path="../settings/manifest.json"	# Into the restore script, the manifest is not at the same place
-    fi
-    version=$(sudo grep '\"version\": ' "$manifest_path" | cut -d '"' -f 4)	# Retrieve the version number in the manifest file.
-    dep_app=${app//_/-}	# Replace all '_' by '-'
-
-    if ynh_package_is_installed "${dep_app}-ynh-deps"; then
-		echo "A package named ${dep_app}-ynh-deps is already installed" >&2
-    else
-        cat > ./${dep_app}-ynh-deps.control << EOF	# Make a control file for equivs-build
-Section: misc
-Priority: optional
-Package: ${dep_app}-ynh-deps
-Version: ${version}
-Depends: ${dependencies// /, }
-Architecture: all
-Description: Fake package for ${app} (YunoHost app) dependencies
- This meta-package is only responsible of installing its dependencies.
+	# Update the symbolic link for this version
+	sudo ln --symbolic --force --no-target-directory \$version_path/\$real_nodejs_version \$version_path/\$version
+done <<< "\$(echo "\$all_real_version")"
 EOF
-        ynh_package_install_from_equivs ./${dep_app}-ynh-deps.control \
-            || ynh_die "Unable to install dependencies"	# Install the fake package and its dependencies
-        ynh_app_setting_set $app apt_dependencies $dependencies
-    fi
-}
 
-# Remove fake package and its dependencies
-#
-# Dependencies will removed only if no other package need them.
-#
-# usage: ynh_remove_app_dependencies
-ynh_remove_app_dependencies () {
-    dep_app=${app//_/-}	# Replace all '_' by '-'
-    ynh_package_autoremove ${dep_app}-ynh-deps	# Remove the fake package and its dependencies if they not still used.
-}
+	chmod +x "$n_install_dir/node_update.sh"
 
-# Use logrotate to manage the logfile
-#
-# usage: ynh_use_logrotate [logfile]
-# | arg: logfile - absolute path of logfile
-#
-# If no argument provided, a standard directory will be use. /var/log/${app}
-# You can provide a path with the directory only or with the logfile.
-# /parentdir/logdir/
-# /parentdir/logdir/logfile.log
-#
-# It's possible to use this helper several times, each config will added to same logrotate config file.
-ynh_use_logrotate () {
-	if [ "$#" -gt 0 ]; then
-		if [ "$(echo ${1##*.})" == "log" ]; then	# Keep only the extension to check if it's a logfile
-			logfile=$1	# In this case, focus logrotate on the logfile
-		else
-			logfile=$1/.log	# Else, uses the directory and all logfile into it.
-		fi
-	else
-		logfile="/var/log/${app}/*.log" # Without argument, use a defaut directory in /var/log
-	fi
-	cat > ./${app}-logrotate << EOF	# Build a config file for logrotate
-$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 move the log.
-	copytruncate
-		# Do not do an error if the log is missing
-	missingok
-		# Not rotate if the log is empty
-	notifempty
-		# Keep old logs in the same dir
-	noolddir
-}
+	# 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
-	sudo mkdir -p $(dirname "$logfile")	# Create the log directory, if not exist
-	cat ${app}-logrotate | sudo tee -a /etc/logrotate.d/$app > /dev/null	# Append this config to the others for this app. If a config file already exist
-}
-
-# Remove the app's logrotate config.
-#
-# usage: ynh_remove_logrotate
-ynh_remove_logrotate () {
-	if [ -e "/etc/logrotate.d/$app" ]; then
-		sudo rm "/etc/logrotate.d/$app"
-	fi
-}
-
-# Find a free port and return it
-#
-# example: port=$(ynh_find_port 8080)
-#
-# usage: ynh_find_port begin_port
-# | arg: begin_port - port to start to search
-ynh_find_port () {
-	port=$1
-	test -n "$port" || ynh_die "The argument of ynh_find_port must be a valid port."
-	while netcat -z 127.0.0.1 $port       # Check if the port is free
-	do
-		port=$((port+1))	# Else, pass to next port
-	done
-	echo $port
-}
-
-# Create a system user
-#
-# usage: ynh_system_user_create user_name [home_dir]
-# | arg: user_name - Name of the system user that will be create
-# | arg: 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
-ynh_system_user_create () {
-	if ! ynh_system_user_exists "$1"	# Check if the user exists on the system
-	then	# If the user doesn't exist
-		if [ $# -ge 2 ]; then	# If a home dir is mentioned
-			user_home_dir="-d $2"
-		else
-			user_home_dir="--no-create-home"
-		fi
-		sudo useradd $user_home_dir --system --user-group $1 --shell /usr/sbin/nologin || ynh_die "Unable to create $1 system account"
-	fi
-}
-
-# Delete a system user
-#
-# usage: ynh_system_user_delete user_name
-# | arg: user_name - Name of the system user that will be create
-ynh_system_user_delete () {
-    if ynh_system_user_exists "$1"	# Check if the user exists on the system
-    then
-		echo "Remove the user $1" >&2
-		sudo userdel $1
-	else
-		echo "The user $1 was not found" >&2
-    fi
-}
-
-# Curl abstraction to help with POST requests to local pages (such as installation forms)
-#
-# $domain and $path_url should be defined externally (and correspond to the domain.tld and the /path (of the app?))
-#
-# example: ynh_local_curl "/install.php?installButton" "foo=$var1" "bar=$var2"
-# 
-# usage: ynh_local_curl "page_uri" "key1=value1" "key2=value2" ...
-# | arg: page_uri    - Path (relative to $path_url) of the page where POST data will be sent
-# | arg: key1=value1 - (Optionnal) POST key and corresponding value
-# | arg: key2=value2 - (Optionnal) Another POST key and corresponding value
-# | arg: ...         - (Optionnal) More POST keys and values
-ynh_local_curl () {
-	# Define url of page to curl
-	full_page_url=https://localhost$path_url$1
-
-	# Concatenate all other arguments with '&' to prepare POST data
-	POST_data=""
-	for arg in "${@: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
-
-	# Curl the URL
-	curl --silent --show-error -kL -H "Host: $domain" --resolve $domain:443:127.0.0.1 $POST_data "$full_page_url"
-}
-
-# Substitute/replace a string by another in a file
-#
-# usage: ynh_replace_string match_string replace_string target_file
-# | arg: match_string - String to be searched and replaced in the file
-# | arg: replace_string - String that will replace matches
-# | arg: target_file - File in which the string will be replaced.
-ynh_replace_string () {
-	delimit=@
-	match_string=${1//${delimit}/"\\${delimit}"}	# Escape the delimiter if it's in the string.
-	replace_string=${2//${delimit}/"\\${delimit}"}
-	workfile=$3
-
-	sudo sed --in-place "s${delimit}${match_string}${delimit}${replace_string}${delimit}g" "$workfile"
-}
-
-# Remove a file or a directory securely
-#
-# usage: ynh_secure_remove path_to_remove
-# | arg: path_to_remove - File or directory to remove
-ynh_secure_remove () {
-	path_to_remove=$1
-	forbidden_path=" \
-	/var/www \
-	/home/yunohost.app"
-
-	if [[ "$forbidden_path" =~ "$path_to_remove" \
-		# Match all paths or subpaths in $forbidden_path
-		|| "$path_to_remove" =~ ^/[[:alnum:]]+$ \
-		# Match all first level paths from / (Like /var, /root, etc...)
-		|| "${path_to_remove:${#path_to_remove}-1}" = "/" ]]
-		# Match if the path finishes by /. Because it seems there is an empty variable
-	then
-		echo "Avoid deleting $path_to_remove." >&2
-	else
-		if [ -e "$path_to_remove" ]
-		then
-			sudo rm -R "$path_to_remove"
-		else
-			echo "$path_to_remove wasn't deleted because it doesn't exist." >&2
-		fi
-	fi
-}
-
-# Download, check integrity, uncompress and patch the source from app.src
-#
-# The file conf/app.src need to contains:
-# 
-# SOURCE_URL=Address to download the app archive
-# SOURCE_SUM=Control sum
-# # (Optional) Programm to check the integrity (sha256sum, md5sum$YNH_EXECUTION_DIR/...)
-# # default: sha256
-# SOURCE_SUM_PRG=sha256
-# # (Optional) Archive format
-# # default: tar.gz
-# SOURCE_FORMAT=tar.gz
-# # (Optional) Put false if source are directly in the archive root
-# # default: true
-# SOURCE_IN_SUBDIR=false
-# # (Optionnal) Name of the local archive (offline setup support)
-# # default: ${src_id}.${src_format}
-# SOURCE_FILENAME=example.tar.gz 
-#
-# Details:
-# This helper download sources from SOURCE_URL if there is no local source
-# archive in /opt/yunohost-apps-src/APP_ID/SOURCE_FILENAME
-# 
-# Next, it check the integrity with "SOURCE_SUM_PRG -c --status" command.
-# 
-# If it's ok, the source archive will be uncompress in $dest_dir. If the
-# SOURCE_IN_SUBDIR is true, the first level directory of the archive will be
-# removed.
-#
-# Finally, patches named sources/patches/${src_id}-*.patch and extra files in
-# sources/extra_files/$src_id will be applyed to dest_dir
-#
-#
-# usage: ynh_setup_source dest_dir [source_id]
-# | arg: dest_dir  - Directory where to setup sources
-# | arg: source_id - Name of the app, if the package contains more than one app
-YNH_EXECUTION_DIR="."
-ynh_setup_source () {
-    local dest_dir=$1
-    local src_id=${2:-app} # If the argument is not given, source_id equal "app"
-
-    # Load value from configuration file (see above for a small doc about this file
-    # format)
-    local src_url=$(grep 'SOURCE_URL=' "$YNH_EXECUTION_DIR/../conf/${src_id}.src" | cut -d= -f2-)
-    local src_sum=$(grep 'SOURCE_SUM=' "$YNH_EXECUTION_DIR/../conf/${src_id}.src" | cut -d= -f2-)
-    local src_sumprg=$(grep 'SOURCE_SUM_PRG=' "$YNH_EXECUTION_DIR/../conf/${src_id}.src" | cut -d= -f2-)
-    local src_format=$(grep 'SOURCE_FORMAT=' "$YNH_EXECUTION_DIR/../conf/${src_id}.src" | cut -d= -f2-)
-    local src_in_subdir=$(grep 'SOURCE_IN_SUBDIR=' "$YNH_EXECUTION_DIR/../conf/${src_id}.src" | cut -d= -f2-)
-    local src_filename=$(grep 'SOURCE_FILENAME=' "$YNH_EXECUTION_DIR/../conf/${src_id}.src" | cut -d= -f2-)
-
-    # Default value
-    src_sumprg=${src_sumprg:-sha256sum}
-    src_in_subdir=${src_in_subdir:-true}
-    src_format=${src_format:-tar.gz}
-    src_format=$(echo "$src_format" | tr '[:upper:]' '[:lower:]')
-    if [ "$src_filename" = "" ] ; then
-        src_filename="${src_id}.${src_format}"
-    fi
-    local local_src="/opt/yunohost-apps-src/${YNH_APP_ID}/${src_filename}"
-
-    if test -e "$local_src"
-    then    # Use the local source file if it is present
-        cp $local_src $src_filename
-    else    # If not, download the source
-        wget -nv -O $src_filename $src_url
-    fi
-
-    # Check the control sum
-    echo "${src_sum} ${src_filename}" | ${src_sumprg} -c --status \
-        || ynh_die "Corrupt source"
-
-    # Extract source into the app dir
-    sudo mkdir -p "$dest_dir"
-    if [ "$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 -d)
-            sudo unzip -quo $src_filename -d "$tmp_dir"
-            sudo cp -a $tmp_dir/*/. "$dest_dir"
-            ynh_secure_remove "$tmp_dir"
-        else
-            sudo unzip -quo $src_filename -d "$dest_dir"
-        fi
-    else
-        local strip=""
-        if $src_in_subdir ; then
-            strip="--strip-components 1"
-        fi
-        if [[ "$src_format" =~ ^tar.gz|tar.bz2|tar.xz$ ]] ; then
-            sudo tar -xf $src_filename -C "$dest_dir" $strip
-        else
-            ynh_die "Archive format unrecognized."
-        fi
-    fi
-
-    # Apply patches
-    if (( $(find $YNH_EXECUTION_DIR/../sources/patches/ -type f -name "${src_id}-*.patch" 2> /dev/null | wc -l) > "0" )); then
-        local old_dir=$(pwd)
-        (cd "$dest_dir" \
-            && for p in $YNH_EXECUTION_DIR/../sources/patches/${src_id}-*.patch; do \
-                sudo patch -p1 < $p; done) \
-            || ynh_die "Unable to apply patches"
-        cd $old_dir
-    fi
-
-    # Add supplementary files
-    if test -e "$YNH_EXECUTION_DIR/../sources/extra_files/${src_id}"; then
-        sudo cp -a $YNH_EXECUTION_DIR/../sources/extra_files/$src_id/. "$dest_dir"
-    fi
-}
-
-# Check availability of a web path
-#
-# example: ynh_webpath_available some.domain.tld /coffee
-#
-# usage: ynh_webpath_available domain path
-# | arg: domain - the domain/host of the url
-# | arg: path - the web path to check the availability of
-ynh_webpath_available () {
-	local domain=$1
-	local path=$2
-	sudo yunohost domain url-available $domain $path
-}
-
-# Register/book a web path for an app
-#
-# example: ynh_webpath_register wordpress some.domain.tld /coffee
-#
-# usage: ynh_webpath_register app domain path
-# | arg: app - the app for which the domain should be registered
-# | arg: domain - the domain/host of the web path
-# | arg: path - the web path to be registered
-ynh_webpath_register () {
-	local app=$1
-	local domain=$2
-	local path=$3
-	sudo yunohost app register-url $app $domain $path
-}
-
-# Calculate and store a file checksum into the app settings
-#
-# $app should be defined when calling this helper
-#
-# usage: ynh_store_file_checksum file
-# | arg: file - The file on which the checksum will performed, then stored.
-ynh_store_file_checksum () {
-	local checksum_setting_name=checksum_${1//[\/ ]/_}	# Replace all '/' and ' ' by '_'
-	ynh_app_setting_set $app $checksum_setting_name $(sudo md5sum "$1" | cut -d' ' -f1)
-}
-
-# Verify the checksum and backup the file if it's different
-# This helper is primarily meant to allow to easily backup personalised/manually 
-# modified config files.
-#
-# $app should be defined when calling this helper
-#
-# usage: ynh_backup_if_checksum_is_different file
-# | arg: file - The file on which the checksum test will be perfomed.
-#
-# | ret: Return the name a the backup file, or nothing
-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 $app $checksum_setting_name)
-	if [ -n "$checksum_value" ]
-	then	# Proceed only if a value was stored into the app settings
-		if ! echo "$checksum_value $file" | sudo md5sum -c --status
-		then	# If the checksum is now different
-			backup_file="/home/yunohost.conf/backup/$file.backup.$(date '+%Y%m%d.%H%M%S')"
-			sudo mkdir -p "$(dirname "$backup_file")"
-			sudo cp -a "$file" "$backup_file"	# Backup the current file
-			echo "File $file has been manually modified since the installation or last upgrade. So it has been duplicated in $backup_file" >&2
-			echo "$backup_file"	# Return the name of the backup file
-		fi
-	fi
+
+	chmod +x "/etc/cron.daily/node_update"
 }
diff --git a/scripts/_variables b/scripts/_variables
new file mode 100644
index 0000000..2f0a533
--- /dev/null
+++ b/scripts/_variables
@@ -0,0 +1,4 @@
+#!/bin/bash
+
+# Dependencies
+app_depencencies="carton perlmagick"
diff --git a/scripts/backup b/scripts/backup
index 90a08df..e20b387 100644
--- a/scripts/backup
+++ b/scripts/backup
@@ -1,26 +1,26 @@
 #!/bin/bash
 
 #=================================================
-# GENERIC STARTING
-#=================================================
-# MANAGE FAILURE OF THE SCRIPT
-#=================================================
-
-# Exit on command errors and treat unset variables as an error
-set -eu
-
+# GENERIC START
 #=================================================
 # IMPORT GENERIC HELPERS
 #=================================================
 
 if [ ! -e _common.sh ]; then
-	# Rapatrie le fichier de fonctions si il n'est pas dans le dossier courant
-	sudo cp ../settings/scripts/_common.sh ./_common.sh
-	sudo chmod a+rx _common.sh
+	# Get the _common.sh file if it's not in the current directory
+	cp ../settings/scripts/_common.sh ./_common.sh
+	chmod a+rx _common.sh
 fi
 source _common.sh
 source /usr/share/yunohost/helpers
 
+#=================================================
+# MANAGE SCRIPT FAILURE
+#=================================================
+
+# Exit if an error occurs during the execution of the script
+ynh_abort_if_errors
+
 #=================================================
 # LOAD SETTINGS
 #=================================================
@@ -37,13 +37,13 @@ domain=$(ynh_app_setting_get $app domain)
 #=================================================
 
 CHECK_SIZE "$final_path"
-ynh_backup "$final_path" "${YNH_APP_BACKUP_DIR}$final_path"
+ynh_backup "$final_path"
 
 #=================================================
 # BACKUP OF THE NGINX CONFIGURATION
 #=================================================
 
-ynh_backup "/etc/nginx/conf.d/$domain.d/$app.conf" "${YNH_APP_BACKUP_DIR}/etc/nginx/conf.d/$domain.d/$app.conf"
+ynh_backup "/etc/nginx/conf.d/$domain.d/$app.conf"
 
 #=================================================
 # SPECIFIC BACKUP
@@ -51,16 +51,16 @@ ynh_backup "/etc/nginx/conf.d/$domain.d/$app.conf" "${YNH_APP_BACKUP_DIR}/etc/ng
 # BACKUP LOGROTATE
 #=================================================
 
-ynh_backup "/etc/logrotate.d/$app" "${YNH_APP_BACKUP_DIR}/etc/logrotate.d/$app"
+ynh_backup "/etc/logrotate.d/$app"
 
 #=================================================
 # BACKUP SYSTEMD
 #=================================================
 
-ynh_backup "/etc/systemd/system/$app.service" "${YNH_APP_BACKUP_DIR}/etc/systemd/system/$app.service"
+ynh_backup "/etc/systemd/system/$app.service"
 
 #=================================================
 # BACKUP OF THE CRON FILE
 #=================================================
 
-ynh_backup "/etc/cron.d/$app" "${YNH_APP_BACKUP_DIR}/etc/cron.d/$app"
+ynh_backup "/etc/cron.d/$app"
diff --git a/scripts/install b/scripts/install
index 0532e42..5c2012e 100644
--- a/scripts/install
+++ b/scripts/install
@@ -8,6 +8,8 @@
 
 source _common.sh
 source /usr/share/yunohost/helpers
+# Load common variables for all scripts.
+source _variables
 
 #=================================================
 # MANAGE FAILURE OF THE SCRIPT
@@ -31,9 +33,16 @@ app=$YNH_APP_INSTANCE_NAME
 # CHECK IF THE APP CAN BE INSTALLED WITH THIS ARGS
 #=================================================
 
-path_url=$(ynh_normalize_url_path $path_url)	# Vérifie et corrige la syntaxe du path.
-CHECK_DOMAINPATH	# Vérifie la disponibilité du path et du domaine.
-CHECK_FINALPATH	# Vérifie que le dossier de destination n'est pas déjà utilisé.
+final_path=/var/www/$app
+test ! -e "$final_path" || ynh_die "This path already contains a folder"
+
+# Normalize the url path syntax
+path_url=$(ynh_normalize_url_path $path_url)
+
+# Check web path availability
+ynh_webpath_available $domain $path_url
+# Register (book) web path
+ynh_webpath_register $app $domain $path_url
 
 #=================================================
 # STORE SETTINGS FROM MANIFEST
@@ -52,7 +61,7 @@ ynh_app_setting_set $app always_encrypt $always_encrypt
 
 port=$(ynh_find_port 8095)	# Cherche un port libre.
 # Ouvre le port dans le firewall
-ALL_QUIET sudo yunohost firewall allow --no-upnp TCP $port
+ALL_QUIET yunohost firewall allow --no-upnp TCP $port
 ynh_app_setting_set $app port $port
 
 #=================================================
@@ -66,13 +75,13 @@ ynh_setup_source "$final_path"	# Télécharge la source, décompresse et copie d
 # INSTALL DEPENDENCIES
 #=================================================
 
-ynh_install_app_dependencies carton perlmagick
+ynh_install_app_dependencies $app_depencencies
 
 #=================================================
 # NGINX CONFIGURATION
 #=================================================
 
-ynh_nginx_config
+ynh_add_nginx_config
 
 #=================================================
 # CREATE DEDICATED USER
@@ -87,7 +96,7 @@ ynh_system_user_create $app	# Créer un utilisateur système dédié à l'app
 #=================================================
 
 ## Copie et configuration du fichier de conf.
-sudo cp ../conf/lutim.conf.template "$final_path/lutim.conf"
+cp ../conf/lutim.conf.template "$final_path/lutim.conf"
 ynh_replace_string "__DOMAIN__" "$domain" "$final_path/lutim.conf"
 ynh_replace_string "__PATH__" "$path_url" "$final_path/lutim.conf"
 ynh_replace_string "__PORT__" "$port" "$final_path/lutim.conf"
@@ -100,23 +109,23 @@ ynh_store_file_checksum "$final_path/lutim.conf"	# Enregistre la somme de contr
 # SETUP SYSTEMD
 #=================================================
 
-ynh_systemd_config
+ynh_add_systemd_config
 
 #=================================================
 # SETUP CRON
 #=================================================
 
-sudo cp ../conf/cron_lutim /etc/cron.d/$app
+cp ../conf/cron_lutim /etc/cron.d/$app
 ynh_replace_string "__FINALPATH__" "$final_path/" /etc/cron.d/$app
-sudo chmod +x $final_path/script/lutim
+chmod +x $final_path/script/lutim
 
 #=================================================
 # INSTALL LUTIM WITH CARTON
 #=================================================
 
-sudo mkdir -p /var/log/$app/
+mkdir -p /var/log/$app/
 pushd $final_path	# cd avec une stack pour revenir en arrière
-sudo carton install 2>&1 | sudo tee -a "/var/log/$app/setup_carton.log"
+carton install 2>&1 | tee -a "/var/log/$app/setup_carton.log"
 popd	# Revient au dossier courant avant pushd
 
 # Configure le path du dossier perl en fonction de l'architecture système
@@ -132,23 +141,23 @@ ynh_replace_string "__ARCHDIR__" "$arch_dir" "$final_path/script/lutim"
 #=================================================
 
 # Making log symbolic link to /var/log
-sudo touch /var/log/$app/production.log
-sudo chown $app: -R /var/log/$app
-sudo ln -s /var/log/$app/production.log "$final_path/log/production.log"
+touch /var/log/$app/production.log
+chown $app -R /var/log/$app
+ln -s /var/log/$app/production.log "$final_path/log/production.log"
 
 #=================================================
 # SECURING FILES AND DIRECTORIES
 #=================================================
 
-sudo chown -R $app: $final_path
+chown -R $app: $final_path
 
 #=================================================
 # START LUTIM
 #=================================================
 
-sudo systemctl start lutim
+systemctl start lutim
 # Set right permissions on new files created at first start
-sudo chown -R $app: $final_path
+chown -R $app: $final_path
 
 # Check lutim starting
 tempfile="$(mktemp)"
@@ -167,7 +176,7 @@ ynh_use_logrotate
 # ENABLE SERVICE IN ADMIN PANEL
 #=================================================
 
-sudo yunohost service add lutim -l $final_path/log/production.log
+yunohost service add lutim -l $final_path/log/production.log
 
 #=================================================
 # SETUP SSOWAT
@@ -188,7 +197,7 @@ fi
 # RELOAD NGINX
 #=================================================
 
-sudo systemctl reload nginx
+systemctl reload nginx
 
 #=================================================
 # CHECK LUTIM BOOTING
diff --git a/scripts/remove b/scripts/remove
index 6f0f561..62d564c 100644
--- a/scripts/remove
+++ b/scripts/remove
@@ -29,10 +29,10 @@ ynh_remove_systemd_config
 # DISABLE SERVICE IN ADMIN PANEL
 #=================================================
 
-if sudo yunohost service status | grep -q $app	# Test l'existence du service dans Yunohost
+if yunohost service status | grep -q $app	# Test l'existence du service dans Yunohost
 then
 	echo "Remove $app service"
-	sudo yunohost service remove $app
+	yunohost service remove $app
 fi
 
 #=================================================
diff --git a/scripts/restore b/scripts/restore
index 94fb93b..b8fa25f 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -1,25 +1,27 @@
 #!/bin/bash
 
 #=================================================
-# GENERIC STARTING
-#=================================================
-# MANAGE FAILURE OF THE SCRIPT
-#=================================================
-
-# Exit on command errors and treat unset variables as an error
-set -eu
-
+# GENERIC START
 #=================================================
 # IMPORT GENERIC HELPERS
 #=================================================
 
 if [ ! -e _common.sh ]; then
-	# Rapatrie le fichier de fonctions si il n'est pas dans le dossier courant
-	sudo cp ../settings/scripts/_common.sh ./_common.sh
-	sudo chmod a+rx _common.sh
+	# Get the _common.sh file if it's not in the current directory
+	cp ../settings/scripts/_common.sh ./_common.sh
+	chmod a+rx _common.sh
 fi
 source _common.sh
 source /usr/share/yunohost/helpers
+# Load common variables for all scripts.
+source ../settings/scripts/_variables
+
+#=================================================
+# MANAGE SCRIPT FAILURE
+#=================================================
+
+# Exit if an error occurs during the execution of the script
+ynh_abort_if_errors
 
 #=================================================
 # LOAD SETTINGS
@@ -35,7 +37,7 @@ path_url=$(ynh_app_setting_get $app path)
 # CHECK IF THE APP CAN BE RESTORED
 #=================================================
 
-sudo yunohost app checkurl "${domain}${path_url}" -a "$app" \
+yunohost app checkurl "${domain}${path_url}" -a "$app" \
 	|| ynh_die "Path not available: ${domain}${path_url}"
 test ! -d $final_path \
 	|| ynh_die "There is already a directory: $final_path "
@@ -65,7 +67,7 @@ ynh_system_user_create $app	# Recreate the dedicated user, if not exist
 #=================================================
 
 # Les fichiers appartiennent à root
-sudo chown -R $app: $final_path
+chown -R $app: $final_path
 
 #=================================================
 # SPECIFIC RESTORE
@@ -73,13 +75,13 @@ sudo chown -R $app: $final_path
 # REINSTALL DEPENDENCIES
 #=================================================
 
-ynh_install_app_dependencies carton perlmagick
+ynh_install_app_dependencies $app_depencencies
 
 #=================================================
 # ENABLE SERVICE IN ADMIN PANEL
 #=================================================
 
-sudo yunohost service add $app --log "/var/log/$app/APP.log"
+yunohost service add $app --log "/var/log/$app/APP.log"
 
 #=================================================
 # RESTORE SYSTEMD
@@ -87,7 +89,7 @@ sudo yunohost service add $app --log "/var/log/$app/APP.log"
 
 ynh_restore_file "/etc/systemd/system/$app.service"
 ## Démarrage auto du service
-sudo systemctl enable $app.service
+systemctl enable $app.service
 
 #=================================================
 # RESTORE OF THE CRON FILE
@@ -100,9 +102,9 @@ ynh_restore_file "/etc/cron.d/$app"
 #=================================================
 
 # Making log symbolic link to /var/log
-sudo mkdir -p /var/log/$app/
-sudo touch /var/log/$app/production.log
-sudo chown $app: -R /var/log/$app
+mkdir -p /var/log/$app/
+touch /var/log/$app/production.log
+chown $app -R /var/log/$app
 
 #=================================================
 # RESTORE THE LOGROTATE CONFIGURATION
@@ -116,7 +118,7 @@ ynh_restore_file "/etc/logrotate.d/$app"
 # RELOAD NGINX
 #=================================================
 
-sudo systemctl reload nginx
+systemctl reload nginx
 
 #=================================================
 # START AND CHECK LUTIM BOOTING
@@ -125,7 +127,7 @@ sudo systemctl reload nginx
 tempfile="$(mktemp)"
 tail -f -n1 /var/log/$app/production.log > "$tempfile" &	# Suit le démarrage dans le log
 PID_TAIL=$!	# Récupère le PID de la commande tail, qui est passée en arrière plan.
-sudo systemctl restart $app	# Démarre lutim
+systemctl restart $app	# Démarre lutim
 
 for i in `seq 1 60`
 do	# La boucle attend le démarrage de lutim. Ou 1 minute. Cette boucle évite simplement un 502 au début, car le démarrage est parfois long...
diff --git a/scripts/upgrade b/scripts/upgrade
index e41edd1..2098c8d 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -52,11 +52,14 @@ fi
 # BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
 #=================================================
 
-BACKUP_BEFORE_UPGRADE	# Backup the current version of the app
+# Backup the current version of the app
+ynh_backup_before_upgrade
 ynh_clean_setup () {
-	BACKUP_FAIL_UPGRADE	# restore it if the upgrade fails
+	# restore it if the upgrade fails
+	ynh_restore_upgradebackup
 }
-ynh_abort_if_errors	# Active trap pour arrêter le script si une erreur est détectée.
+# Exit if an error occurs during the execution of the script
+ynh_abort_if_errors
 
 #=================================================
 # CHECK THE PATH
@@ -76,7 +79,7 @@ ynh_setup_source "$final_path"	# Télécharge la source, décompresse et copie d
 # NGINX CONFIGURATION
 #=================================================
 
-ynh_nginx_config
+ynh_add_nginx_config
 
 #=================================================
 # CREATE DEDICATED USER
@@ -92,7 +95,7 @@ ynh_system_user_create $app	# Create the dedicated user, if not exist
 
 ## Copie et configuration du fichier de conf.
 ynh_backup_if_checksum_is_different "$final_path/lutim.conf"	# Créé un backup du fichier de config si il a été modifié.
-sudo cp ../conf/lutim.conf.template "$final_path/lutim.conf"
+cp ../conf/lutim.conf.template "$final_path/lutim.conf"
 ynh_replace_string "__DOMAIN__" "$domain" "$final_path/lutim.conf"
 ynh_replace_string "__PATH__" "$path_url" "$final_path/lutim.conf"
 ynh_replace_string "__PORT__" "$port" "$final_path/lutim.conf"
@@ -103,13 +106,13 @@ ynh_store_file_checksum "$final_path/lutim.conf"	# Réenregistre la somme de con
 # SETUP SYSTEMD
 #=================================================
 
-ynh_systemd_config
+ynh_add_systemd_config
 
 #=================================================
 # SETUP CRON
 #=================================================
 
-sudo cp ../conf/cron_lutim /etc/cron.d/$app
+cp ../conf/cron_lutim /etc/cron.d/$app
 ynh_replace_string "__FINALPATH__" "$final_path/" /etc/cron.d/$app
 
 #=================================================
@@ -117,14 +120,14 @@ ynh_replace_string "__FINALPATH__" "$final_path/" /etc/cron.d/$app
 #=================================================
 
 pushd $final_path	# cd avec une stack pour revenir en arrière
-sudo carton install 2>&1 | sudo tee -a "/var/log/$app/setup_carton.log"
+carton install 2>&1 | tee -a "/var/log/$app/setup_carton.log"
 popd	# Revient au dossier courant avant pushd
 
 #=================================================
 # SECURING FILES AND DIRECTORIES
 #=================================================
 
-sudo chown -R $app: $final_path
+chown -R $app: $final_path
 
 #=================================================
 # GENERIC FINALISATION
@@ -132,8 +135,8 @@ sudo chown -R $app: $final_path
 # SETUP LOGROTATE
 #=================================================
 
-ynh_use_logrotate
-sudo chown $app: -R /var/log/$app
+ynh_use_logrotate --non-append
+chown $app -R /var/log/$app
 
 #=================================================
 # SETUP SSOWAT
@@ -151,7 +154,7 @@ fi
 # RELOAD NGINX
 #=================================================
 
-sudo systemctl reload nginx
+systemctl reload nginx
 
 #=================================================
 # START AND CHECK LUTIM BOOTING
@@ -160,7 +163,7 @@ sudo systemctl reload nginx
 tempfile="$(mktemp)"
 tail -f -n1 /var/log/$app/production.log > "$tempfile" &	# Suit le démarrage dans le log
 PID_TAIL=$!	# Récupère le PID de la commande tail, qui est passée en arrière plan.
-sudo systemctl restart $app	# Démarre lutim
+systemctl restart $app	# Démarre lutim
 
 for i in `seq 1 60`
 do	# La boucle attend le démarrage de lutim. Ou 1 minute. Cette boucle évite simplement un 502 au début, car le démarrage est parfois long...