Change owner for backup file generated by backupninja

Question

I'm using BackupNinja on Raspbian Jessie Lite to create a scheduled backup of my SD. The backup job is configured as a simple TAR file backup.

The default permissions on the generated backup files are:

-rw- --- --- root:root

I want to change the default permissions and owner of the .tar files generated after the backup process ends. Is there an option for BackupNinja to do that, something like a "File owner" option that is set by default to root, or can I configure it on the job?

Otherwise do I need to make my own script that uses chown and chmod?

Answer 1

I don't know anything about BackupNinja but if it (like most backup programs) can write to stdout then you can do something like this:

echo foo | su -g users nobody bash -c 'umask 177; cat >/tmp/newfile'
ls -l /tmp/newfile
-rw------- 1 nobody users 4  4. Feb 09:39 /tmp/newfile

Answer 2

The owner of the files that are generated by a process are the same as the owner of the process itself. When your backup tool runs as root than the owner of the backup-tar will be root.

The solution to the problem should be, that you run the backup process as user and not as root. I guess you use something like a cron job to do your backup. So Refer to the following link to run a cron job as specific user:

[https://superuser.com/questions/170866/how-to-run-a-cron-job-as-a-specific-user][1]

I hope this was helpful.