WIP: Resolve "Restore from legacy backup"

Closes #182

utils/backup_app.sh

 #!/bin/bash
 #- Backup App (Piwigo) database and data files
 #- Author: B. Mauclaire - bm@ekimia.fr - 2019/11/11
-#- Usage: vm archive's name will be built with the database's name
+#- Author: M. Memeteau - mm@ekimia.fr - 2020/01/01
+#- Usage: vm archive's name will be built with the app's name
 
 #--- Manage arguments:
 case $# in
-   1) ARG1="$1" ;;
-   *) echo "Usage: ./backup_app.sh APP DB_PASSWORD" ; exit 1;;
+   1) APP_NAME="$1" ;;
+   2) DB_PWD="$2" ;;
+   *) echo "Usage: ./backup_app.sh APP_NAME DB_PASSWORD" ; exit 1;;
 esac
 
 #--- Connexion parameters:
@@ -15,9 +17,7 @@ HOST_USER='root'
 HOST_PORT=622
 DB_NAME='piwigo'
 DB_USER='piwigo'
-DB_PWD="$ARG1"
 
-APP_NAME='piwigo'
 
 #app piwigo directories 
 APP_DIR='/var/www/photos'
@@ -26,8 +26,8 @@ APP_DATA2='upload' ; # photos/upload
 
 #app prestashop directories 
 
-APP_DIR='/var/www/html'
-APP_DATA1=
+#APP_DIR='/var/www/html'
+#APP_DATA1=
 
 #app nextcloud directories