diff --git a/scripts/upgrade b/scripts/upgrade
index 05a7907..4c7f19d 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -1,2 +1,159 @@
 #!/bin/bash
 
+#=================================================
+# GENERIC START
+#=================================================
+# IMPORT GENERIC HELPERS
+#=================================================
+
+source _common.sh
+source /usr/share/yunohost/helpers
+
+#=================================================
+# LOAD SETTINGS
+#=================================================
+
+app=$YNH_APP_INSTANCE_NAME
+
+
+domain=$YNH_APP_ARG_DOMAIN
+path=$YNH_APP_ARG_PATH
+path_url=""
+admin=$YNH_APP_ARG_ADMIN
+is_public=$YNH_APP_ARG_IS_PUBLIC
+title=$YNH_APP_ARG_TITLE
+privatelinkbydefault=$YNH_APP_ARG_PRIVATELINKBYDEFAULT
+password=$YNH_APP_ARG_PASSWORD
+privateinstance=$YNH_APP_ARG_PRIVATEINSTANCE
+path_url=$YNH_APP_ARG_PATH
+
+#=================================================
+# ENSURE DOWNWARD COMPATIBILITY
+#=================================================
+
+# Fix is_public as a boolean value
+if [ "$is_public" = "Yes" ]; then
+	ynh_app_setting_set $app is_public 1
+	is_public=1
+elif [ "$is_public" = "No" ]; then
+	ynh_app_setting_set $app is_public 0
+	is_public=0
+fi
+
+# If db_name doesn't exist, create it
+if [ -z $db_name ]; then
+	db_name=$(ynh_sanitize_dbid $app)
+	ynh_app_setting_set $app db_name $db_name
+fi
+
+# If final_path doesn't exist, create it
+if [ -z $final_path ]; then
+	final_path=/var/www/$app
+	ynh_app_setting_set $app final_path $final_path
+fi
+
+#=================================================
+# BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
+#=================================================
+
+# Backup the current version of the app
+ynh_backup_before_upgrade
+ynh_clean_setup () {
+	# restore it if the upgrade fails
+	ynh_restore_upgradebackup
+}
+# Exit if an error occurs during the execution of the script
+ynh_abort_if_errors
+
+#=================================================
+# CHECK THE PATH
+#=================================================
+
+# Normalize the URL path syntax
+path_url=$(ynh_normalize_url_path $path_url)
+
+#=================================================
+# STANDARD UPGRADE STEPS
+#=================================================
+# DOWNLOAD, CHECK AND UNPACK SOURCE
+#=================================================
+
+# Download, check integrity, uncompress and patch the source from app.src
+ynh_setup_source "$final_path"
+
+#=================================================
+# NGINX CONFIGURATION
+#=================================================
+
+# Create a dedicated nginx config
+ynh_add_nginx_config
+
+#=================================================
+# CREATE DEDICATED USER
+#=================================================
+
+# Create a system user
+ynh_system_user_create $app
+
+#=================================================
+# PHP-FPM CONFIGURATION
+#=================================================
+
+# Create a dedicated php-fpm config
+ynh_add_fpm_config
+
+#=================================================
+# SPECIFIC UPGRADE
+#=================================================
+salt=$(dd if=/dev/urandom bs=1 count=200 2> /dev/null | tr -c -d 'A-Za-z0-9' | sed -n 's/\(.\{24\}\).*/\1/p')
+password_hash=$(php ../conf/gen_hash.php $password $admin $salt)
+# set the proper value for substitution
+if [ $privatelinkbydefault = "No" ]; then
+privatelinkbydefault_php=false
+else
+privatelinkbydefault_php=true
+fi
+
+
+# Verify the checksum and backup the file if it's different
+ynh_backup_if_checksum_is_different "$final_path/CONFIG_FILE"
+# Recalculate and store the config file checksum into the app settings
+ynh_store_file_checksum "$final_path/CONFIG_FILE"
+
+#=================================================
+# SETUP LOGROTATE
+#=================================================
+
+# Use logrotate to manage app-specific logfile(s)
+ynh_use_logrotate
+
+
+#=================================================
+# GENERIC FINALIZATION
+#=================================================
+# SECURE FILES AND DIRECTORIES
+#=================================================
+
+# Set right permissions for curl installation
+chown -R root: $final_path
+
+#=================================================
+# SETUP SSOWAT
+#=================================================
+
+if [ $is_public -eq 0 ]
+then	# Remove the public access
+	ynh_app_setting_delete $app skipped_uris
+fi
+# Make app public if necessary
+if [ $is_public -eq 1 ]
+then
+	# unprotected_uris allows SSO credentials to be passed anyway
+	ynh_app_setting_set $app unprotected_uris "/"
+fi
+
+#=================================================
+# RELOAD NGINX
+#=================================================
+
+systemctl reload nginx