Re: Trying to sync two svn repositories with git-svn (repost)

From: Josef Wolf <jw@raven.inka.de>
Date: May 4, 2009, 21:14 UTC
Message-ID: <20090504211423.GK15420@raven.wolf.lan>
In-Reply-To: <32541b130905040858v2a0b7a6br5b056a365fcb6855@mail.gmail.com>

On Mon, May 04, 2009 at 11:58:20AM -0400, Avery Pennarun wrote:

Show 16 quoted lines

> On Sat, May 2, 2009 at 5:58 PM, Josef Wolf <jw@raven.inka.de> wrote:
> > Somehow, I still can't get it work.  This is what I do:
> [...]
> >  # move stuff from svn-2 to svn-1
> >  #
> >  git svn fetch svn-2
> >  git checkout svn-1
> >  git cherry-pick 05b964
> >  [  continue cherry-picking ]
> >  git merge --no-ff -s ours svn-1
> 
> Note that you probably should be merging '-s ours svn-2' here, not
> svn-1.  svn-1 already contains svn-1 (of course) so that merge didn't
> do anything.  It most especially doesn't mark svn-1 as being
> up-to-date with svn-2, and that's probably going to make trouble
> later.

Yeah, you're right.  That was a typo.

Fixing this, the "getting started" seems to work now: the cherry-picked commits end up in the svn repositories. But the synchronization after the "getting started" does not seem to work yet. Here's what I've done:

 git tag svn-1-orig svn-1
 git tag svn-2-orig svn-2

 # move cherries to svn-2
 #
 git svn fetch svn-1
 git checkout svn-2
 git cherry-pick c9da
 [ ... ]
 git merge --no-ff -s ours svn-1
 git checkout svn-2/trunk
 git merge --no-ff svn-2
 git svn dcommit
 git diff svn-2-orig svn-2/trunk   # check what I've done

 # move cherries to svn-1
 #
 git svn fetch svn-2
 git checkout svn-1
 git cherry-pick 05b9
 [ ... ]
 git merge --no-ff -s ours svn-2
 git checkout svn-1/trunk
 git merge --no-ff svn-1
 git svn dcommit
 git diff svn-1-orig svn-1/trunk   # check what I've done

 git diff svn-1/trunk svn-2/trunk  # shows the diffs I want to keep

 # now try a synchronization
 #
 git checkout svn-2/trunk
 git svn fetch svn-1      # nothing new was checked in yet
 git merge --no-ff svn-1
 git svn dcommit

Since no new commits were made in svn, those four commands should be almost a no-op.

But Instead of merging only the changes that were done after the last synchronization, the last dcommit makes svn-2/trunk identical to svn-1. This effectively wipes all the differences which I would like to keep.