feat: add purge system for local YunoHost backups

roles/ynh_backup/README-FR.md

@@ -32,6 +32,8 @@ ynh_backup:
   apps: True
   src_script: "templates/ynh_backup.sh.j2"
   dest_script: "/usr/bin"
+
+number_days_to_keep: "2"
 ```
 
 - `ynh_backup.scheduled` : active la fonctionnalité de sauvegarde des applications YunoHost, mettez la valeur à `True`.
@@ -39,6 +41,7 @@ ynh_backup:
 - `ynh_backup.scheduled_[hour|minute|weekday|month]`: modifie la planification de la tâche cron. Par défaut, elle se déclenchera tous les jours de l'année à 1 heure du matin. Pour plus d'informations concernant les réglages horaires cron, cet outil peut être utile : <https://crontab.guru/>.
 - `ynh_backup.system` : **obligatoire**. Activez la sauvegarde du système YunoHost en mettant la valeur à `True`.
 - `ynh_backup.apps` : **obligatoire**. Activez la sauvegarde des applications YunoHost en mettant la valeur à `True`.
+- `number_days_to_keep` : **obligatoire**. Détermine le nombre de jours à garder pour le système de purge.
 
 ### Sauvegardes distantes avec BorgBackup
 

roles/ynh_backup/README.md

@@ -39,6 +39,7 @@ ynh_backup:
 - `ynh_backup.scheduled_[hour|minute|weekday|month]`: modifies the scheduling of the cron task. By default, it will run every day of the year at 1am. For more information about cron time settings, this tool can be useful: <https://crontab.guru/>.
 - `ynh_backup.system`: **mandatory**. Enables automatic backup of the YunoHost system by setting the value to `True`.
 - `ynh_backup.apps`: **mandatory**. Enables automatic backup of YunoHost applications by setting the value to `True`.
+- `number_days_to_keep` : **mandatory**. Determines the number of days to keep for the purging system.
 
 ### remote backups with YunoHost BorgBackup
 

roles/ynh_backup/defaults/main.yml

@@ -29,6 +29,8 @@ ynh_backup:
   # system: True
   # apps: True
 
+number_days_to_keep: "2"
+
 # Variables for YunoHost BorgBackup
 ynh_borg_backup_scheduled: False
 borg_source_directories:

roles/ynh_backup/templates/ynh_backup.sh.j2

-#!/bin/sh
+#!/bin/bash
+today="$(date +%Y%m%d)"
+number_to_keep="{{ number_days_to_keep }}"
+old_backup_list="$(yunohost backup list --output-as plain | head -n -"$number_to_keep")" # Afficher toutes les lignes de sauvegardes à part les deux dernières.
 
-yunohost backup create {% if ynh_backup.system %}--system{% endif %}{% if ynh_backup.apps %} --apps{% endif %}{% if ynh_backup.directory %} --output-directory {{ ynh_backup.directory }}/backup_$(date +%Y%m%d_%H%M) {% endif %}
+_good() {
+    echo "SUCCESS: ${1}" && exit 0
+}
 
-{% if ynh_backup.system is false and ynh_backup.apps is false %}
-    echo "Read the readme to know more about vars ynh_backup.system and ynh_backup.apps"
-    exit 1
-{% endif %}
+_fail() {
+    echo "ERROR: ${1}" && exit 1
+}
+
+_create_ynh_backup() {
+  echo "Backing up $today YunoHost data now."
+  yunohost backup create {% if ynh_backup.system %}--system{% endif %}{% if ynh_backup.apps %} --apps{% endif %}{% if ynh_backup.directory %} --output-directory {{ ynh_backup.directory }}/backup_"$today" {% endif %} || _fail "can't create a backup"
+
+}
+
+_prune_old_backup() {
+  if [ -n "$old_backup_list" ]; then
+    for backup in $old_backup_list; do
+      echo "Backup $backup is 2 days old or more. Purging it now."
+      yunohost backup delete "$backup"
+    done
+    _good "Purging of old backups completed."
+  else
+    _good "There is no old backup to be purged."
+  fi
+}
+
+_create_ynh_backup
+_prune_old_backup