Add backup/restore scripts

scripts/backup

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+#!/bin/bash
+
+# Exit on command errors and treat unset variables as an error
+set -eu
+
+# See comments in install script
+app=$YNH_APP_INSTANCE_NAME
+
+# Source YunoHost helpers
+source /usr/share/yunohost/helpers
+
+# Backup sources & data
+# Note: the last argument is where to save this path, see the restore script.
+ynh_backup "/var/www/${app}" "sources"
+
+# Copy NGINX configuration
+domain=$(ynh_app_setting_get "$app" domain)
+ynh_backup "/etc/nginx/conf.d/${domain}.d/${app}.conf" "nginx.conf"
+
+

scripts/restore

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+#!/bin/bash
+
+# Note: each files and directories you've saved using the ynh_backup helper
+# will be located in the current directory, regarding the last argument.
+
+# Exit on command errors and treat unset variables as an error
+set -eu
+
+# See comments in install script
+app=$YNH_APP_INSTANCE_NAME
+
+# Source YunoHost helpers
+source /usr/share/yunohost/helpers
+
+# Retrieve old app settings
+domain=$(ynh_app_setting_get "$app" domain)
+path_url=$(ynh_app_setting_get "$app" path_url)
+
+# Check domain/path availability
+sudo yunohost app checkurl "${domain}${path_url}" -a "$app" \
+    || ynh_die "Path not available: ${domain}${path_url}"
+
+# Restore sources & data
+src_path="/var/www/${app}"
+sudo cp -a ./sources "$src_path"
+
+# Restore permissions to app files
+# you may need to make some file and/or directory writeable by www-data (nginx user)
+sudo chown -R root: "$src_path"
+
+# Restore NGINX configuration
+sudo cp -a ./nginx.conf "/etc/nginx/conf.d/${domain}.d/${app}.conf"
+
+# Restart webserver
+sudo service nginx reload