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My company uses Git for version control but we are working on a project with another company that uses SVN (they refuse to use Git). I need to set up our Git server as the central server and somehow provide SVN access to it. I know git-svn works great for using Git while SVN is the central server, but how do I provide SVN access to a Git repository?

Note: I saw that Github is now providing SVN access to their Git repositories. Does anyone know how they do it?

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  • Github is using an internally-developed SVN-to-Git gateway. They have been silent thus far about releasing the sources; I doubt they will. Commented Dec 17, 2010 at 16:27
  • A little more background: we're using gitolite for the git server. Perhaps someone should petition/help gitolite to produce a solution? Commented Dec 17, 2010 at 18:26
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    This is clearly not a valid answer, but I would tell them, "Tough #$@!, you're using git for this project." Commented Dec 17, 2010 at 18:48
  • @haydenmuhl - I like it! unfortunately I don't think it'll work Commented Dec 17, 2010 at 19:01
  • Either they are using git, or they don't get the award of contract. Commented Dec 17, 2010 at 20:44

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A crude way I can think of is to setup an svn repository inside your network, checkout from there using git-svn, add your real git repo` as a remote, pull from there and push into the svn remote. I don't know if it'll work or is reliable but it should produce some kind of a mirror. You can your side of it in sync using some of the hooks that get kicked in when a push occurs to update the SVN mirror. As for the other way around (when your clients commit to the SVN repository), you'll have to think of something else for that.

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Yes, I have thought of using hooks as a way to sync SVN & git, but it seems incredibly error prone, so I was hoping someone has some experience doing so.
Well, you have a weird problem so... :)
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Yes, you can use SubGit:

Create empty SVN repository

$ svnadmin create path/for/svn/repository

Configure it to link with your Git repository using SubGit:

$ subgit configure path/for/svn/repository
$ #edit path/for/svn/repository/conf/subgit.conf to set git.default.repository (absolute or relative path to your bare Git repository)

Start continuous synchronization:

$ subgit install path/for/svn/repository

Both SVN and Git interfaces will be readable and writable as result.

GitHub uses another approach, as I know: they implemented an SVN interface that accesses the Git on-the-fly. The approach has its own advantages and drawbacks.

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That's a great option. I wish it was available 1.5 years ago :(
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Ok, I'm going to answer my own question with a bad, but feasible, answer (imo). I can use standard patch files to send changes between our two companies. My manager believes this is an acceptable solution, but I really don't like it

EDIT: In response to Noufal Ibrahim, I think that by using Tailor in combination with hook scripts I might actually have an automated solution that might actually work. This blog has a great description for using Tailor to set up an SVN mirror.

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Well, there are quilt and Tailor which might make your life a little easier.

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