diff --git a/README.md b/README.md
index 9cdfeac..fc229ca 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ It shall NOT be edited by hand.
 
 # Droppy for YunoHost
 
-[![Integration level](https://dash.yunohost.org/integration/droppy.svg)](https://dash.yunohost.org/appci/app/droppy) ![](https://ci-apps.yunohost.org/ci/badges/droppy.status.svg) ![](https://ci-apps.yunohost.org/ci/badges/droppy.maintain.svg)  
+[![Integration level](https://dash.yunohost.org/integration/droppy.svg)](https://dash.yunohost.org/appci/app/droppy) ![Working status](https://ci-apps.yunohost.org/ci/badges/droppy.status.svg) ![Maintenance status](https://ci-apps.yunohost.org/ci/badges/droppy.maintain.svg)  
 [![Install Droppy with YunoHost](https://install-app.yunohost.org/install-with-yunohost.svg)](https://install-app.yunohost.org/?app=droppy)
 
 *[Lire ce readme en français.](./README_fr.md)*
@@ -20,11 +20,9 @@ Droppy is a self-hosted file storage server with a web interface and capabilitie
 
 **Shipped version:** 12.2.0~ynh10
 
-
-
 ## Screenshots
 
-![](./doc/screenshots/screenshot.png)
+![Screenshot of Droppy](./doc/screenshots/screenshot.png)
 
 ## Disclaimers / important information
 
@@ -38,19 +36,20 @@ Shared files are stored in the following directory: `/home/yunohost.app/droppy/f
 
 ## Documentation and resources
 
-* Upstream app code repository: https://github.com/silverwind/droppy
-* YunoHost documentation for this app: https://yunohost.org/app_droppy
-* Report a bug: https://github.com/YunoHost-Apps/droppy_ynh/issues
+* Upstream app code repository: <https://github.com/silverwind/droppy>
+* YunoHost documentation for this app: <https://yunohost.org/app_droppy>
+* Report a bug: <https://github.com/YunoHost-Apps/droppy_ynh/issues>
 
 ## Developer info
 
 Please send your pull request to the [testing branch](https://github.com/YunoHost-Apps/droppy_ynh/tree/testing).
 
 To try the testing branch, please proceed like that.
-```
+
+``` bash
 sudo yunohost app install https://github.com/YunoHost-Apps/droppy_ynh/tree/testing --debug
 or
 sudo yunohost app upgrade droppy -u https://github.com/YunoHost-Apps/droppy_ynh/tree/testing --debug
 ```
 
-**More info regarding app packaging:** https://yunohost.org/packaging_apps
\ No newline at end of file
+**More info regarding app packaging:** <https://yunohost.org/packaging_apps>
diff --git a/README_fr.md b/README_fr.md
index 598c79d..1859955 100644
--- a/README_fr.md
+++ b/README_fr.md
@@ -1,10 +1,14 @@
+<!--
+N.B.: This README was automatically generated by https://github.com/YunoHost/apps/tree/master/tools/README-generator
+It shall NOT be edited by hand.
+-->
+
 # Droppy pour YunoHost
 
-[![Niveau d'intégration](https://dash.yunohost.org/integration/droppy.svg)](https://dash.yunohost.org/appci/app/droppy) ![](https://ci-apps.yunohost.org/ci/badges/droppy.status.svg) ![](https://ci-apps.yunohost.org/ci/badges/droppy.maintain.svg)  
+[![Niveau d'intégration](https://dash.yunohost.org/integration/droppy.svg)](https://dash.yunohost.org/appci/app/droppy) ![Statut du fonctionnement](https://ci-apps.yunohost.org/ci/badges/droppy.status.svg) ![Statut de maintenance](https://ci-apps.yunohost.org/ci/badges/droppy.maintain.svg)  
 [![Installer Droppy avec YunoHost](https://install-app.yunohost.org/install-with-yunohost.svg)](https://install-app.yunohost.org/?app=droppy)
 
 *[Read this readme in english.](./README.md)*
-*[Lire ce readme en français.](./README_fr.md)*
 
 > *Ce package vous permet d'installer Droppy rapidement et simplement sur un serveur YunoHost.
 Si vous n'avez pas YunoHost, regardez [ici](https://yunohost.org/#/install) pour savoir comment l'installer et en profiter.*
@@ -16,11 +20,9 @@ Droppy est un serveur de stockage de fichiers auto-hébergé avec une interface
 
 **Version incluse :** 12.2.0~ynh10
 
-
-
 ## Captures d'écran
 
-![](./doc/screenshots/screenshot.png)
+![Capture d'écran de Droppy](./doc/screenshots/screenshot.png)
 
 ## Avertissements / informations importantes
 
@@ -33,19 +35,20 @@ Les fichiers partagés sont stockés dans le répertoire suivant : `/home/yunoho
 
 ## Documentations et ressources
 
-* Dépôt de code officiel de l'app : https://github.com/silverwind/droppy
-* Documentation YunoHost pour cette app : https://yunohost.org/app_droppy
-* Signaler un bug : https://github.com/YunoHost-Apps/droppy_ynh/issues
+* Dépôt de code officiel de l'app : <https://github.com/silverwind/droppy>
+* Documentation YunoHost pour cette app : <https://yunohost.org/app_droppy>
+* Signaler un bug : <https://github.com/YunoHost-Apps/droppy_ynh/issues>
 
 ## Informations pour les développeurs
 
 Merci de faire vos pull request sur la [branche testing](https://github.com/YunoHost-Apps/droppy_ynh/tree/testing).
 
 Pour essayer la branche testing, procédez comme suit.
-```
+
+``` bash
 sudo yunohost app install https://github.com/YunoHost-Apps/droppy_ynh/tree/testing --debug
 ou
 sudo yunohost app upgrade droppy -u https://github.com/YunoHost-Apps/droppy_ynh/tree/testing --debug
 ```
 
-**Plus d'infos sur le packaging d'applications :** https://yunohost.org/packaging_apps
\ No newline at end of file
+**Plus d'infos sur le packaging d'applications :** <https://yunohost.org/packaging_apps>
diff --git a/check_process b/check_process
index 7b095d0..6095ca9 100644
--- a/check_process
+++ b/check_process
@@ -2,7 +2,6 @@
 	; Manifest
 		domain="domain.tld"
 		path="/path"
-		admin="john"
 		is_public=1
 	; Checks
 		pkg_linter=1
@@ -13,8 +12,11 @@
 		setup_public=1
 		upgrade=1
 		#upgrade=1	from_commit=cf621e81a3df37b77cdc97a305e10dfb27631c6a
+		# 12.2.0~ynh10
+		upgrade=1	from_commit=88e894a01858a723ea62b154103867cafb49dfa8
 		backup_restore=1
 		multi_instance=0
+		port_already_use=0
 		change_url=1
 ;;; Options
 Email=
diff --git a/conf/systemd.service b/conf/systemd.service
index 4d70a71..8932b81 100644
--- a/conf/systemd.service
+++ b/conf/systemd.service
@@ -3,11 +3,12 @@ Description=Droppy: self-hosted file storage server
 After=network.target
 
 [Service]
+Type=simple
 User=__APP__
 Group=__APP__
-WorkingDirectory=__FINALPATH__
+WorkingDirectory=__FINALPATH__/
 Environment="NODE_ENV=production"
-Environment="PATH=__ENV_PATH__"
+Environment="__YNH_NODE_LOAD_PATH__"
 ExecStart= __FINALPATH__/droppy.js start -c __FINALPATH__/config -f /home/yunohost.app/__APP__/files
 AmbientCapabilities=CAP_NET_BIND_SERVICE
 Restart=always
@@ -16,4 +17,4 @@ StandardOutput=journal
 StandardError=journal
 
 [Install]
-WantedBy=multi-user.target
\ No newline at end of file
+WantedBy=multi-user.target
diff --git a/manifest.json b/manifest.json
index e96fb1f..8a977f5 100644
--- a/manifest.json
+++ b/manifest.json
@@ -24,7 +24,7 @@
         "nginx"
     ],
     "arguments": {
-        "install" : [
+        "install": [
             {
                 "name": "domain",
                 "type": "domain"
diff --git a/scripts/backup b/scripts/backup
index 1724afa..2a41ab0 100644
--- a/scripts/backup
+++ b/scripts/backup
@@ -6,6 +6,7 @@
 # IMPORT GENERIC HELPERS
 #=================================================
 
+# Keep this path for calling _common.sh inside the execution's context of backup and restore scripts
 source ../settings/scripts/_common.sh
 source /usr/share/yunohost/helpers
 
@@ -14,7 +15,7 @@ source /usr/share/yunohost/helpers
 #=================================================
 
 ynh_clean_setup () {
-	ynh_clean_check_starting
+	true
 }
 # Exit if an error occurs during the execution of the script
 ynh_abort_if_errors
@@ -41,18 +42,18 @@ ynh_print_info --message="Declaring files to be backed up..."
 
 ynh_backup --src_path="$final_path"
 
-#=================================================
-# BACKUP THE NGINX CONFIGURATION
-#=================================================
-
-ynh_backup --src_path="/etc/nginx/conf.d/$domain.d/$app.conf"
-
 #=================================================
 # BACKUP THE DATA DIR
 #=================================================
 
 ynh_backup --src_path="$data_path" --is_big
 
+#=================================================
+# BACKUP THE NGINX CONFIGURATION
+#=================================================
+
+ynh_backup --src_path="/etc/nginx/conf.d/$domain.d/$app.conf"
+
 #=================================================
 # SPECIFIC BACKUP
 #=================================================
diff --git a/scripts/change_url b/scripts/change_url
index 9a4d93a..aae96c9 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -31,17 +31,18 @@ final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 port=$(ynh_app_setting_get --app=$app --key=port)
 
 #=================================================
-# BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
+# BACKUP BEFORE CHANGE URL THEN ACTIVE TRAP
 #=================================================
-ynh_script_progression --message="Backing up $app before changing its URL (may take a while)..." --weight=1
+ynh_script_progression --message="Backing up the app before changing its URL (may take a while)..." --weight=1
 
 # Backup the current version of the app
 ynh_backup_before_upgrade
 ynh_clean_setup () {
+	ynh_clean_check_starting
 	# Remove the new domain config file, the remove script won't do it as it doesn't know yet its location.
 	ynh_secure_remove --file="/etc/nginx/conf.d/$new_domain.d/$app.conf"
 
-	# restore it if the upgrade fails
+	# Restore it if the upgrade fails
 	ynh_restore_upgradebackup
 }
 # Exit if an error occurs during the execution of the script
diff --git a/scripts/install b/scripts/install
index e3eb573..376cfb7 100644
--- a/scripts/install
+++ b/scripts/install
@@ -56,7 +56,7 @@ ynh_app_setting_set --app=$app --key=path --value=$path_url
 ynh_script_progression --message="Finding an available port..." --weight=2
 
 # Find an available port
-port=$(ynh_find_port --port=8989)
+port=$(ynh_find_port --port=8095)
 ynh_app_setting_set --app=$app --key=port --value=$port
 
 #=================================================
@@ -64,7 +64,6 @@ ynh_app_setting_set --app=$app --key=port --value=$port
 #=================================================
 ynh_script_progression --message="Installing dependencies..." --weight=2
 
-# Install Nodejs
 ynh_exec_warn_less ynh_install_nodejs --nodejs_version=$nodejs_version
 
 #=================================================
@@ -73,7 +72,7 @@ ynh_exec_warn_less ynh_install_nodejs --nodejs_version=$nodejs_version
 ynh_script_progression --message="Configuring system user..." --weight=1
 
 # Create a system user
-ynh_system_user_create --username=$app --home_dir=$final_path
+ynh_system_user_create --username=$app --home_dir="$final_path"
 
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
@@ -82,7 +81,12 @@ ynh_script_progression --message="Setting up source files..." --weight=5
 
 ynh_app_setting_set --app=$app --key=final_path --value=$final_path
 # Download, check integrity, uncompress and patch the source from app.src
-ynh_setup_source --dest_dir=$final_path
+ynh_setup_source --dest_dir="$final_path"
+mkdir -p $final_path/config
+
+chmod 750 "$final_path"
+chmod -R o-rwx "$final_path"
+chown -R $app:$app "$final_path"
 
 #=================================================
 # NGINX CONFIGURATION
@@ -94,57 +98,47 @@ ynh_add_nginx_config
 
 #=================================================
 # SPECIFIC SETUP
-#==============================================
-# INSTALL DROPPY
-#==============================================
-ynh_script_progression --message="Building $app... (this will take some time and resources!)" --weight=26
+#=================================================
+# BUILD APP
+#=================================================
+ynh_script_progression --message="Building app... (this will take some time and resources!)" --weight=26
 
 pushd "$final_path"
 	ynh_use_nodejs
-	ynh_exec_warn_less $ynh_npm install
+	ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH $ynh_npm install
 popd
 
 #=================================================
-# CREATE DIRECTORY FOR DATA AND CONFIG
+# CREATE DATA DIRECTORY
 #=================================================
-ynh_script_progression --message="Creating the data directory..." --weight=1
+ynh_script_progression --message="Creating a data directory..." --weight=1
 
-# Define app's data directory
 data_path=/home/yunohost.app/$app
 ynh_app_setting_set --app=$app --key=data_path --value=$data_path
 
-# Create datadir folder
 mkdir -p $data_path
 
-# Give permission to the datadir
 chmod 750 "$data_path"
 chmod -R o-rwx "$data_path"
-chown -R $app:www-data "$data_path"
+chown -R $app:$app "$data_path"
 
 #=================================================
-# SETUP SYSTEMD
+# ADD A CONFIGURATION
 #=================================================
-ynh_script_progression --message="Configuring a systemd service..." --weight=1
-
-env_path="$PATH"
-ynh_add_systemd_config
-
-#=================================================
-# MODIFY A CONFIG FILE
-#=================================================
-ynh_script_progression --message="Modifying a config file..." --weight=1
-
-# Create config folder
-mkdir -p $final_path/config
+ynh_script_progression --message="Adding a configuration file..." --weight=1
 
 ynh_add_config --template="../conf/config.json.example" --destination="$final_path/config/config.json"
 
 chmod 600 "$final_path/config/config.json"
 chown $app:$app "$final_path/config/config.json"
 
-chmod 755 "$final_path"
-chmod -R o-rwx "$final_path"
-chown -R $app: "$final_path"
+#=================================================
+# SETUP SYSTEMD
+#=================================================
+ynh_script_progression --message="Configuring a systemd service..." --weight=1
+
+# Create a dedicated systemd config
+ynh_add_systemd_config
 
 #=================================================
 # GENERIC FINALIZATION
@@ -176,9 +170,11 @@ ynh_systemd_action --service_name=$app --action=start --log_path=systemd --line_
 #=================================================
 ynh_script_progression --message="Configuring permissions..." --weight=1
 
-# Make app public if necessary or protect it
+# Make app public if necessary
 if [ $is_public -eq 1 ]
 then
+	# Everyone can access the app.
+	# The "main" permission is automatically created before the install script.
 	ynh_permission_update --permission="main" --add="visitors"
 fi
 
diff --git a/scripts/remove b/scripts/remove
index 7856701..34052de 100644
--- a/scripts/remove
+++ b/scripts/remove
@@ -27,9 +27,10 @@ data_path=$(ynh_app_setting_get --app=$app --key=data_path)
 # REMOVE SERVICE INTEGRATION IN YUNOHOST
 #=================================================
 
+# Remove the service from the list of services known by YunoHost (added from `yunohost service add`)
 if ynh_exec_warn_less yunohost service status $app >/dev/null
 then
-	ynh_script_progression --message="Removing $app service..." --weight=1
+	ynh_script_progression --message="Removing $app service integration..." --weight=1
 	yunohost service remove $app
 fi
 
@@ -41,13 +42,6 @@ ynh_script_progression --message="Stopping and removing the systemd service..."
 # Remove the dedicated systemd config
 ynh_remove_systemd_config
 
-#=================================================
-# REMOVE DEPENDENCIES
-#=================================================
-ynh_script_progression --message="Removing dependencies..." --weight=1
-
-ynh_remove_nodejs
-
 #=================================================
 # REMOVE APP MAIN DIR
 #=================================================
@@ -66,6 +60,7 @@ then
 	ynh_script_progression --message="Removing app data directory..." --weight=1
 	ynh_secure_remove --file="$data_path"
 fi
+
 #=================================================
 # REMOVE NGINX CONFIGURATION
 #=================================================
@@ -74,6 +69,13 @@ ynh_script_progression --message="Removing NGINX web server configuration..." --
 # Remove the dedicated NGINX config
 ynh_remove_nginx_config
 
+#=================================================
+# REMOVE DEPENDENCIES
+#=================================================
+ynh_script_progression --message="Removing dependencies..." --weight=1
+
+ynh_remove_nodejs
+
 #=================================================
 # GENERIC FINALIZATION
 #=================================================
diff --git a/scripts/restore b/scripts/restore
index 04845f2..e1b06df 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -6,6 +6,7 @@
 # IMPORT GENERIC HELPERS
 #=================================================
 
+# Keep this path for calling _common.sh inside the execution's context of backup and restore scripts
 source ../settings/scripts/_common.sh
 source /usr/share/yunohost/helpers
 
@@ -22,7 +23,7 @@ ynh_abort_if_errors
 #=================================================
 # LOAD SETTINGS
 #=================================================
-ynh_script_progression --message="Loading settings..." --weight=1
+ynh_script_progression --message="Loading installation settings..." --weight=1
 
 app=$YNH_APP_INSTANCE_NAME
 
@@ -36,14 +37,15 @@ data_path=$(ynh_app_setting_get --app=$app --key=data_path)
 #=================================================
 ynh_script_progression --message="Validating restoration parameters..." --weight=2
 
-test ! -d $final_path || ynh_die --message="There is already a directory: $final_path "
+test ! -d $final_path \
+	|| ynh_die --message="There is already a directory: $final_path "
 
 #=================================================
 # STANDARD RESTORATION STEPS
 #=================================================
 # RESTORE THE NGINX CONFIGURATION
 #=================================================
-ynh_script_progression --message="Restoring the NGINX configuration..."
+ynh_script_progression --message="Restoring the NGINX web server configuration..."
 
 ynh_restore_file --origin_path="/etc/nginx/conf.d/$domain.d/$app.conf"
 
@@ -53,15 +55,32 @@ ynh_restore_file --origin_path="/etc/nginx/conf.d/$domain.d/$app.conf"
 ynh_script_progression --message="Recreating the dedicated system user..." --weight=1
 
 # Create the dedicated user (if not existing)
-ynh_system_user_create --username=$app --home_dir=$final_path
+ynh_system_user_create --username=$app --home_dir="$final_path"
 
 #=================================================
 # RESTORE THE APP MAIN DIR
 #=================================================
-ynh_script_progression --message="Restoring $app main directory..." --weight=20
+ynh_script_progression --message="Restoring the app main directory..." --weight=20
 
 ynh_restore_file --origin_path="$final_path"
 
+chmod 750 "$final_path"
+chmod -R o-rwx "$final_path"
+chown -R $app:$app "$final_path"
+
+#=================================================
+# RESTORE THE DATA DIRECTORY
+#=================================================
+ynh_script_progression --message="Restoring the data directory..." --weight=1
+
+ynh_restore_file --origin_path="$data_path" --not_mandatory
+
+mkdir -p $data_path
+
+chmod 750 "$data_path"
+chmod -R o-rwx "$data_path"
+chown -R $app:$app "$data_path"
+
 #=================================================
 # SPECIFIC RESTORATION
 #=================================================
@@ -80,23 +99,6 @@ ynh_script_progression --message="Restoring the systemd configuration..." --weig
 ynh_restore_file --origin_path="/etc/systemd/system/$app.service"
 systemctl enable $app.service --quiet
 
-#=================================================
-# RESTORE THE DATA DIRECTORY
-#=================================================
-ynh_script_progression --message="Restoring the data directory..." --weight=1
-
-ynh_restore_file --origin_path="$data_path" --not_mandatory
-
-mkdir -p $data_path
-
-chmod 750 "$data_path"
-chmod -R o-rwx "$data_path"
-chown -R $app:www-data "$data_path"
-
-chmod 755 "$final_path"
-chmod -R o-rwx "$final_path"
-chown -R $app: "$final_path"
-
 #=================================================
 # RESTORE THE LOGROTATE CONFIGURATION
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index 546d263..7d8a1de 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -20,27 +20,39 @@ domain=$(ynh_app_setting_get --app=$app --key=domain)
 path_url=$(ynh_app_setting_get --app=$app --key=path)
 final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 port=$(ynh_app_setting_get --app=$app --key=port)
+data_path=$(ynh_app_setting_get --app=$app --key=data_path)
 
 #=================================================
 # CHECK VERSION
 #=================================================
+ynh_script_progression --message="Checking version..."
 
 upgrade_type=$(ynh_check_app_version_changed)
 
 #=================================================
 # BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
 #=================================================
-ynh_script_progression --message="Backing up $app before upgrading (may take a while)..." --weight=2
+ynh_script_progression --message="Backing up the app before upgrading (may take a while)..." --weight=2
 
 # Backup the current version of the app
 ynh_backup_before_upgrade
 ynh_clean_setup () {
-	# restore it if the upgrade fails
+	ynh_clean_check_starting
+	# Restore it if the upgrade fails
 	ynh_restore_upgradebackup
 }
 # Exit if an error occurs during the execution of the script
 ynh_abort_if_errors
 
+#=================================================
+# STANDARD UPGRADE STEPS
+#=================================================
+# STOP SYSTEMD SERVICE
+#=================================================
+ynh_script_progression --message="Stopping a systemd service..." --weight=9
+
+ynh_systemd_action --service_name=$app --action="stop" --log_path=systemd
+
 #=================================================
 # ENSURE DOWNWARD COMPATIBILITY
 #=================================================
@@ -53,22 +65,17 @@ if ynh_legacy_permissions_exists; then
 	ynh_app_setting_delete --app=$app --key=is_public
 fi
 
-#=================================================
-# STANDARD UPGRADE STEPS
-#=================================================
-# STOP SYSTEMD SERVICE
-#=================================================
-ynh_script_progression --message="Stopping a systemd service..." --weight=9
-
-ynh_systemd_action --service_name=$app --action=stop --log_path=systemd
-
+if [ -z "$data_path" ]; then
+	data_path=/home/yunohost.app/$app
+	ynh_app_setting_set --app=$app --key=data_path --value=$data_path
+fi
 #=================================================
 # CREATE DEDICATED USER
 #=================================================
 ynh_script_progression --message="Making sure dedicated system user exists..." --weight=1
 
 # Create a dedicated user (if not existing)
-ynh_system_user_create --username=$app --home_dir=$final_path
+ynh_system_user_create --username=$app --home_dir="$final_path"
 
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
@@ -79,9 +86,13 @@ then
 	ynh_script_progression --message="Upgrading source files..." --weight=10
 
 	# Download, check integrity, uncompress and patch the source from app.src
-	ynh_setup_source --dest_dir=$final_path --keep="$final_path/config/config.json"
+	ynh_setup_source --dest_dir=$final_path --keep="config/config.json"
 fi
 
+chmod 750 "$final_path"
+chmod -R o-rwx "$final_path"
+chown -R $app:$app "$final_path"
+
 #=================================================
 # NGINX CONFIGURATION
 #=================================================
@@ -95,35 +106,29 @@ ynh_add_nginx_config
 #=================================================
 ynh_script_progression --message="Upgrading dependencies..." --weight=2
 
-# Install Nodejs
 ynh_exec_warn_less ynh_install_nodejs --nodejs_version=$nodejs_version
 
 #=================================================
 # SPECIFIC UPGRADE
 #==============================================
-# INSTALL DROPPY
+# BUILD APP
 #==============================================
 
 if [ "$upgrade_type" == "UPGRADE_APP" ]
 then
-	ynh_script_progression --message="Building $app... (this will take some time and resources!)" --weight=25
+	ynh_script_progression --message="Building app... (this will take some time and resources!)" --weight=25
 
 	pushd "$final_path"
 		ynh_use_nodejs
-		ynh_exec_warn_less $ynh_npm install
+		ynh_exec_warn_less ynh_exec_as $app $ynh_node_load_PATH $ynh_npm install
 	popd
 fi
 
-chmod 755 "$final_path"
-chmod -R o-rwx "$final_path"
-chown -R $app: "$final_path"
-
 #=================================================
 # SETUP SYSTEMD
 #=================================================
-ynh_script_progression --message="Configuring a systemd service..." --weight=2
+ynh_script_progression --message="Upgrading systemd configuration..." --weight=2
 
-env_path="$PATH"
 # Create a dedicated systemd config
 ynh_add_systemd_config