Add dedicated system user.

This adds a dependency on YNH version to be able to use helpers.
   Prepare work on #2.

manifest.json

@@ -13,7 +13,7 @@
         "url": "https://github.com/scith"
     },
     "requirements": {
-        "yunohost": ">= 2.4.0"
+        "yunohost": ">= 2.6.4"
     },
     "multi_instance": true,
     "services": [

scripts/install

@@ -9,6 +9,9 @@ app=$YNH_APP_INSTANCE_NAME
 domain=$YNH_APP_ARG_DOMAIN
 path=$YNH_APP_ARG_PATH
 
+# Compute parameters
+final_path=/home/yunohost.app/$app
+
 # Source YunoHost helpers
 source /usr/share/yunohost/helpers
 
@@ -16,6 +19,13 @@ source /usr/share/yunohost/helpers
 sudo yunohost app checkurl "${domain}${path}" -a "$app" \
 || ynh_die "Path not available: ${domain}${path}"
 
+# Check system user availability
+if ynh_system_user_exists "$app" ; then
+    ynh_die "System user $app already exists !"
+else
+    ynh_system_user_create "$app" "$final_path"
+fi
+
 # Install dependencies
 sudo apt-get update
 sudo apt-get install nodejs-legacy npm python-pip python-dev python-lxml python-imaging -y -qq

scripts/remove

@@ -17,3 +17,6 @@ sudo rm -f /etc/systemd/system/$app.service
 
 # Reload nginx service
 sudo service nginx reload
+
+# Remove dedicated system user
+ynh_system_user_delete $app