--dry-run would be useful for 'borg compact'

[yrro]

Have you checked borgbackup docs, FAQ, and open GitHub issues?

Yes

Is this a BUG / ISSUE report or a QUESTION?

Feature request

Describe the problem you're observing.

--dry-run isn't available for borg compact.

My wrapper script has to handle this by skipping the execution of borg compact when in dry run mode, rather than adding --dry-run to the borg command line. No big deal, but it would be nice if this option was present for compact as it is with create/prune.

[ThomasWaldmann]

Interesting idea for making scripting a bit easier.

I have to check whether a borg compact --dry-run can be doing anything useful (like e.g. saying how much it would compact/free) with actually doing it.