Clean the old backups of the container's data

docker/container.backup

@@ -6,7 +6,7 @@
 ##	Try to stop the corresponding systemd unit (or docker if no related service is found)
 ##	Make a archive of the container's data to a backup path
 ##	Restart the container service (or docker.service)
-##	TODO : Clean old backup
+##	Clean old backup
 # }}}
 # How-to use {{{
 ## First argument should be the absolut path to the container's data.
@@ -16,6 +16,9 @@
 # Vars {{{
 DEBUG=0
 
+## Nomber of backup to keep
+keep_backup="3"
+
 ## Manage arguments {{{
 ## Expect at least 1 argument and 2 maximum
 case $# in
@@ -105,5 +108,11 @@ tar czf "${ct_backup_path}/${ct_name}-backup.$(date '+%Y%m%d-%H%M').tar.gz" --di
 systemctl start "${ct_service_name}"
 [ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Service management  — Service ${ct_service_name} was started."
 # }}}
+# Remove old backups {{{
+cd -- "${ct_backup_path}" || exit 1
+[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Cleaning  — Keep only the ${keep_backup} newest backups."
+find . -type f | sort | head -n -"${keep_backup}" | xargs -d '\n' rm -f --
+cd -- - > /dev/null || exit 1
+# }}}
 
 exit 0