Re: [BUG?] git fetch -p -t prunes all non-tag refs

["Carlos Martín Nieto" <cmn@elego.de>]

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On Mon, 2011-09-26 at 23:31 -0400, Jeff King wrote:
> On Tue, Sep 27, 2011 at 01:28:09AM +0200, Carlos Martín Nieto wrote:
> 
> > > term I think we should fix it properly. We are already learning "what are
> > > the refs the remote side currently has" from the transport and the right
> > > fix ought to be to use that original information, not the version filtered
> > > for the use of the primary objective of fetch, which is to only fetch what
> > > the user asked for.
> > 
> > Do you mean that we should ignore the refspec? Or do you mean that we
> > should look at the refspec if it exists, and only consider deleting
> > those that meet the refspec, so that `--prune --tags` would only delete
> > tags that don't exist in the remote?
> 
> The latter. If I say:
> 
>   git fetch --prune origin refs/heads/master:refs/remotes/origin/master
> 
> and refs/heads/master doesn't exist on the remote, I would expect
> refs/remotes/origin/master to be deleted locally. And that naturally
> extends to:
> 
>   git fetch --prune origin refs/heads/*:refs/remotes/origin/*

I have some code locally that solves this second part. If we are given
refspecs on the command-line, it will try to match against that instead
of blindly trusting what get_stale_heads tells us. I'm looking into
putting the logic into get_stale_heads so that we can trust it.

The first part might be more complicated. If the remote head doesn't
exist, get_fetch_map dies. It does take a missing_ok flag, so it might
be as easy as passing 1 there; but I'm not sure what that would do for a
non-prune fetch.

> 
> We do something similar with "git push --mirror", which does pruning
> like this[1].
> 
> -Peff
> 
> [1] Actually, I'm not sure how correct "push --mirror" is. It would be
>     nice if the prune operation could be split from the mirror, too. In
>     the past, I have wanted to do both:
> 
>       # backup to a repository where our objects will be shared
>       # with other related backups. So we must only use our slice of the
>       # ref namespace.
>       git push --mirror backup-repo +refs/*:refs/`hostname`/*

Is --mirror needed there? I would have thought that
refs/*:refs/`hostname`/* would do the same by itself.

> 
>     and:
> 
>       # update topic branches we have already published (using the
>       # "matching" refspec), but remove any that we have deleted
>       # locally.
>       git push --mirror publish-point +:
> 
>     and I don't think either works.
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