Remove old backups (#11)

- Added `delete` script 🎉.
  - `DELETE_AFTER` variable must be greater than `0`.

delete.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+# Go to the backups directory.
+cd /backups
+
+# Delete tar.xz archives older than x days.
+find . -iname "*.tar.xz" -type f -mtime +$DELETE_AFTER -exec rm -f {} \;
+
+# Echo that script ran.
+echo "Deleted files older than $DELETE_AFTER days."

entrypoint.sh

@@ -1,9 +1,10 @@
 #!/bin/sh
 
 BACKUP_CMD="/sbin/su-exec ${UID}:${GID} /app/backup.sh"
+DELETE_CMD="/sbin/su-exec ${UID}:${GID} /app/delete.sh"
 LOGS_FILE="/app/log/backup.log"
 
-# Run backup script once ($1 = First argument passed).
+# If passed "manual", run backup script once ($1 = First argument passed).
 if [ "$1" = "manual" ]; then
     echo "[INFO] Running one-time, started at $(date +"%F %r")."
     $BACKUP_CMD
@@ -12,8 +13,14 @@ fi
 
 # Create cron jobs.
 if [ "$(id -u)" -eq 0 ] && [ "$(grep -c "$BACKUP_CMD" "$CRONFILE")" -eq 0 ]; then
+    # Add backup script to cron job list.
     echo "$CRON_TIME $BACKUP_CMD >> $LOGS_FILE 2>&1" | crontab -
-  # Delete after x days job here.
+
+    # Check if $DELETE_AFTER is not null and is greater than 0.
+    # If so, add it to the cron job list.
+    if [ -n "$DELETE_AFTER" ] && [[ "$DELETE_AFTER" -gt 0 ]]; then
+        echo "$CRON_TIME $DELETE_CMD >> $LOGS_FILE 2>&1" | crontab -
+    fi
 fi
 
 # Start crond if it's not running.