Reading remote reflogs

Is it possible to somehow fetch the reflog of a remote?

I would like to delegate some post-receive actions to an automatically mirrored clone of some repositories. Mirrored repositories don't maintain a reflog, even with core.logAllRefUpdates = true, so to be able to know what was pushed per push, it would need to somehow know the reflog of the origin.

Of course a post-receive hook can send this information downstream, but I'd like to keep the origin 'dumb' and not do that.

Dennis Kaarsemaker <dennis@kaarsemaker.net> writes:

Are you sure about this? When log_all_ref_updates is not set, by default we do not log for bare repositories, but other than that, we do not do anything special with respect to reflogs.

	$ (cd .. && git clone --no-local --mirror git.git victim)
        $ git checkout next
        $ EDITOR=: git commit --amend
        $ cd ../victim
	$ git config core.logallrefupdates true
	$ git fetch
        $ find logs
	logs
        logs/HEAD
        logs/refs
        logs/refs/heads
        logs/refs/heads/next

It seems to record how a branch at its origin was updated just fine, at least to me.

On vr, 2013-03-29 at 15:45 -0700, Junio C Hamano wrote:

I was, as I tried the recipe below, though with a different repo. Must have goofed something up, as it works now. Thanks for the braincheck :)

That gives me a reasonable approximation of distinct pushes if I pull the mirror often enough. It's always going to be an approximation though, so the original question still stands.

Dennis Kaarsemaker <dennis@kaarsemaker.net> writes:

Instead of polling, why not "git push --mirror" whenever the original gets updated?

On vr, 2013-03-29 at 15:58 -0700, Junio C Hamano wrote:

I considered that, but it has two downsides:
- Slows down the push as it needs to wait for this to complete
- Only works if you control the master, so it won't work with e.g. 
  github hosted repositories