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Re: git-svn: importing internal externals

From
JKJohn Koleszar <john.koleszar@on2.com>
Date
May 29, 2009, 21:05 UTC
Message-ID
<1243631119.6276.46.camel@cp-jk-linux.corp.on2.com>
In-Reply-To
<20090528112542.GA24403@nan92-1-81-57-214-146.fbx.proxad.net>
On Thu, 2009-05-28 at 07:25 -0400, Yann Dirson wrote:
Show 9 quoted lines
> On Wed, May 27, 2009 at 12:51:29PM -0400, John Koleszar wrote:
> > Hi,
> > 
> > I'm working on a one-off import of an SVN repo that makes use of
> > "internal" svn:externals; i.e. all URLs refer to different spots in the
> > same repo, potentially with peg revisions. The SVN repo holds a number
> > of projects, and my plan is to import them into individual git repos,
> > incorporating the history from any svn:external linked sub-projects.
> 
[...]
> It can be a good idea to share your script nevertheless :)
>

I hacked on this some more and got something pretty usable (for me). It operates on a git-svn clone of the whole repository, propagates commits to different paths if referenced by an external, rearranges the tree to isolate each svn branch on its own head, reparents the branches to their proper branch points, and converts any tags branches to real git tags.

Don't know what the netequitte is on this list regarding attachments for this sort of thing, so I posted it here: http://github.com/jkoleszar/git-svn-internal-externals/tree/master

It's not as fast as I'd like, but it's workable, at least for small repositories. Bottleneck seems to be git-update-index (100s of ms/call) but I haven't looked into it too much. I'm sure I could be smarter in some of my pipelines too. Some numbers (2246 revisions, ~15k files, Core2 6600 @ 2.4GHz, tmpfs):

git-svn fetch: 197.03user 174.63system 22:36.59elapsed 27%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (0major+35448577minor)pagefaults 0swaps

propagating externals: 1381.29user 744.42system 34:28.67elapsed 102%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (2major+305234667minor)pagefaults 0swaps

rearranging heads: 46.13user 64.23system 1:52.42elapsed 98%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (4major+28752709minor)pagefaults 0swaps

reparenting branches: 151.52user 263.50system 6:19.54elapsed 109%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (2major+135830914minor)pagefaults 0swaps

Hope this is useful for someone!
John
Previous: Yann DirsonNext: Yann Dirson
Message 3 of 4 in “git-svn: importing internal externals”
  1. John KoleszarMay 27, 2009
  2. Yann DirsonMay 28, 2009
  3. John KoleszarMay 29, 2009
  4. Yann DirsonJun 10, 2009

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