Re: Can a post-dle-backup script invalidate the backup?

On 21/12/17 02:33 PM, Chapman Flack wrote:
> Hi,
>
> If a backup application succeeds (exit 0), but then a post-dle-backup
> script runs and detects an error, does the backup get marked as failed?
>
> Example: the amlvmsnapshot script runs at pre-dle-backup and creates
> a snapshot, runs again at post-dle-backup and removes it. At the time
> of removal, it checks the size usage of the snapshot. If it reached
> 100% during the time the backup was running, it is bad news, and one
> must not trust the backup, but only the post-dle-backup script detects
> this, even if the backup application seemed to exit normally.
>
> -Chap
>

It's not possible, and it will be unreliable

The application save its state file (gnutar listdir) before it exit, and 
the following backup can be relative to that state file, failing a 
backup after that step could lead to unreliable following backup.

You want to run the post-script after the backup is done but before it 
save its state file. Interesting idea.

Do we have other case where a post-script could invalidate a backup?

Jean-Louis
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