read-only git mirror of an svn repository

Question

What would be the best way to set up a read-only git mirror of an existing svn repository, and set up post-commit hooks such that whenever someone commits to svn, the git mirror is automatically updated? Mainly, I'd like to run git-svn clone just once, on the server, and then let people just check out from git without having to git-svn clone the entire svn repository themselves.

Answer 1

I do that on a project that uses SVN (pushing to a public repository on github). I don't have a SVN commit hook, but this on a cron job:

#!/bin/bash

repo=/path/to/my-mirror.git
lockfile="$repo/cron-lock"

if ! lockfile -r1 "$lockfile";then
        exit 1
fi

export GIT_DIR=$repo
# update refs/remotes/git-svn:
git svn fetch -q
# make 'master' match the git-svn branch:
git fetch "$repo" refs/remotes/git-svn:refs/heads/master
# publish to github
git push github master

rm -f "$lockfile"

If you trigger this from a SVN commit hook instead of a cron job, it should work.

Of course, you need to set up a remote called github using git remote add github [...]. The git repository I am using is a "bare" repository (see git init --bare).

Answer 2

The best way to set up an Svn/Git mirror (writable) would be to use SubGit - this is a tool specifically developed for this task. Disclaimer: I am the developer of this tool.