diff --git a/scripts/_common.sh b/scripts/_common.sh
index e5b02a2..54f3ad5 100644
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -16,3 +16,46 @@ exec_as() {
     sudo -u "$USER" "$@"
   fi
 }
+
+# Execute a command with Composer
+#
+# usage: ynh_composer_exec [--workdir=$final_path] --commands="commands"
+# | arg: -w, --workdir - The directory from where the command will be executed. Default $final_path.
+# | arg: -c, --commands - Commands to execute.
+ynh_composer_exec () {
+	# Declare an array to define the options of this helper.
+	local legacy_args=wc
+	declare -Ar args_array=( [w]=workdir= [c]=commands= )
+	local workdir
+	local commands
+	# Manage arguments with getopts
+	ynh_handle_getopts_args "$@"
+	workdir="${workdir:-$final_path}"
+
+	COMPOSER_HOME="$workdir/.composer" \
+		php "$workdir/composer.phar" $commands \
+		-d "$workdir" --quiet --no-interaction
+}
+
+# Install and initialize Composer in the given directory
+#
+# usage: ynh_install_composer [--workdir=$final_path]
+# | arg: -w, --workdir - The directory from where the command will be executed. Default $final_path.
+ynh_install_composer () {
+	# Declare an array to define the options of this helper.
+	local legacy_args=w
+	declare -Ar args_array=( [w]=workdir= )
+	local workdir
+	# Manage arguments with getopts
+	ynh_handle_getopts_args "$@"
+	workdir="${workdir:-$final_path}"
+
+	curl -sS https://getcomposer.org/installer \
+		| COMPOSER_HOME="$workdir/.composer" \
+		php -- --quiet --install-dir="$workdir" \
+		|| ynh_die "Unable to install Composer."
+
+	# update dependencies to create composer.lock
+	ynh_composer_exec --workdir="$workdir" --commands="install --no-dev" \
+		|| ynh_die "Unable to update core dependencies with Composer."
+}
diff --git a/scripts/_getopts_fix.sh b/scripts/_getopts_fix.sh
new file mode 100644
index 0000000..25a71be
--- /dev/null
+++ b/scripts/_getopts_fix.sh
@@ -0,0 +1,213 @@
+#!/bin/bash
+
+#=================================================
+# FIX OF YNH_HANDLE_GETOPTS_ARGS FROM UNSTABLE
+#=================================================
+
+# Internal helper design to allow helpers to use getopts to manage their arguments
+#
+# [internal]
+#
+# example: function my_helper()
+# {
+#     declare -Ar args_array=( [a]=arg1= [b]=arg2= [c]=arg3 )
+#     local arg1
+#     local arg2
+#     local arg3
+#     ynh_handle_getopts_args "$@"
+#
+#     [...]
+# }
+# 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:
+# declare -Ar 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
+# declare -Ar 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.
+ynh_handle_getopts_args () {
+	# Manage arguments only if there's some provided
+	set +x
+	if [ $# -ne 0 ]
+	then
+		# Store arguments in an array to keep each argument separated
+		local arguments=("$@")
+
+		# 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 $(( ${#arguments[@]} - 1 ))`
+			do
+				# And replace long option (value of the option_flag) by the short option, the option_flag itself
+				# (e.g. for [u]=user, --user will be -u)
+				# Replace long option with =
+				arguments[arg]="${arguments[arg]//--${args_array[$option_flag]}/-${option_flag} }"
+				# And long option without =
+				arguments[arg]="${arguments[arg]//--${args_array[$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 [ "$parameter" = "?" ]
+				then
+					ynh_die --message="Invalid argument: -${OPTARG:-}"
+				elif [ "$parameter" = ":" ]
+				then
+					ynh_die --message="-$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]#-${parameter} }"
+							# Reduce the value of shift, because the option has been removed manually
+							shift_value=$(( 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
+								# 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 ${option_var}+="\;"
+								fi
+								# Escape double quote to prevent any interpretation during the eval
+								all_args[$i]="${all_args[$i]//\"/\\\"}"
+
+								eval ${option_var}+=\"${all_args[$i]}\"
+								shift_value=$(( shift_value + 1 ))
+							fi
+						done
+					fi
+				fi
+
+				# Shift the parameter and its argument(s)
+				shift $shift_value
+			done
+		}
+
+		# LEGACY MODE
+		# Check if there's getopts arguments
+		if [ "${arguments[0]:0:1}" != "-" ]
+		then
+			# If not, enter in legacy mode and manage the arguments as positionnal ones..
+			# Dot not echo, to prevent to go through a helper output. But print only in the log.
+			set -x; echo "! Helper used in legacy mode !" > /dev/null; set +x
+			local i
+			for i in `seq 0 $(( ${#arguments[@]} -1 ))`
+			do
+				# Try to use legacy_args as a list of option_flag of the array args_array
+				# Otherwise, fallback to getopts_parameters to get the option_flag. But an associative arrays isn't always sorted in the correct order...
+				# Remove all ':' in getopts_parameters
+				getopts_parameters=${legacy_args:-${getopts_parameters//:}}
+				# Get the option_flag from getopts_parameters, by using the option_flag according to the position of the argument.
+				option_flag=${getopts_parameters:$i:1}
+				if [ -z "$option_flag" ]; then
+						ynh_print_warn --message="Too many arguments ! \"${arguments[$i]}\" will be ignored."
+						continue
+				fi
+				# Use the long option, corresponding to the option_flag, 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="${args_array[$option_flag]%=}"
+
+				# Escape double quote to prevent any interpretation during the eval
+				arguments[$i]="${arguments[$i]//\"/\\\"}"
+
+				# Store each value given as argument in the corresponding variable
+				# The values will be stored in the same order than $args_array
+				eval ${option_var}+=\"${arguments[$i]}\"
+			done
+			unset legacy_args
+		else
+			# END LEGACY MODE
+			# Call parse_arg and pass the modified list of args as an array of arguments.
+			parse_arg "${arguments[@]}"
+		fi
+	fi
+	set -x
+}
diff --git a/scripts/install b/scripts/install
index 27ec007..427b462 100644
--- a/scripts/install
+++ b/scripts/install
@@ -8,6 +8,9 @@
 
 source _common.sh
 source /usr/share/yunohost/helpers
+# Overload the helper ynh_handle_getopts_args to have fixes from unstable.
+# Needed for composer helpers
+source _getopts_fix.sh
 
 #=================================================
 # MANAGE SCRIPT FAILURE
@@ -140,25 +143,12 @@ ynh_store_file_checksum "$final_path/config.inc.php"
 #=================================================
 ynh_print_info "Installing dependencies with Composer..."
 
-# Set permissions for initialization
-chown -R $app: "$final_path"
-
 # Install composer
-curl -sS https://getcomposer.org/installer \
-	| COMPOSER_HOME="$final_path/.composer" \
-	php -- --quiet --install-dir="$final_path" \
-	|| ynh_die "Unable to install Composer"
-
-# Update dependencies to create composer.lock
-exec_as $app COMPOSER_HOME="$final_path/.composer" \
-	php "$final_path/composer.phar" install --no-dev \
-	-d "$final_path" --quiet --no-interaction \
-	|| ynh_die "Unable to update core dependencies with Composer"
+ynh_install_composer
 
 # Install dependencies
-ynh_exec_warn_less exec_as $app COMPOSER_HOME="$final_path/.composer" \
-	php "$final_path/composer.phar" update --no-dev \
-	-d "$final_path" --quiet --no-interaction
+# ynh_exec_warn_less ynh_composer_exec --commands="update --no-dev"
+ynh_composer_exec --commands="update --no-dev"
 
 #=================================================
 # GENERIC FINALIZATION
diff --git a/scripts/upgrade b/scripts/upgrade
index 23c78a2..e0f607e 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -8,6 +8,9 @@
 
 source _common.sh
 source /usr/share/yunohost/helpers
+# Overload the helper ynh_handle_getopts_args to have fixes from unstable.
+# Needed for composer helpers
+source _getopts_fix.sh
 
 #=================================================
 # LOAD SETTINGS
@@ -165,25 +168,11 @@ ynh_store_file_checksum "$final_path/config.inc.php"
 #=================================================
 ynh_print_info "Upgrading dependencies with Composer..."
 
-# Set permissions for initialization
-chown -R $app: "$final_path"
-
 # Install composer
-curl -sS https://getcomposer.org/installer \
-	| COMPOSER_HOME="$final_path/.composer" \
-	php -- --quiet --install-dir="$final_path" \
-	|| ynh_die "Unable to install Composer"
-
-# Update dependencies to create composer.lock
-exec_as $app COMPOSER_HOME="$final_path/.composer" \
-	php "$final_path/composer.phar" install --no-dev \
-	-d "$final_path" --quiet --no-interaction \
-	|| ynh_die "Unable to update core dependencies with Composer"
+ynh_install_composer
 
 # Install dependencies
-ynh_exec_warn_less exec_as $app COMPOSER_HOME="$final_path/.composer" \
-	php "$final_path/composer.phar" update --no-dev \
-	-d "$final_path" --quiet --no-interaction
+ynh_exec_warn_less ynh_composer_exec --commands=\"update --no-dev\"
 
 #=================================================
 # GENERIC FINALIZATION