git-svn From GitHub To Svn

Updating a git mirror of an SVN repository

Reviving a git-svn clone

1. Clone from GitHub

git clone [github url]
cd repo

2. Check Ref

git branch -r   

e.g.

  origin/HEAD -> origin/feature-jdk17
  origin/feature-jdk17  
  origin/master  

Content of .git/config:

[core]
        repositoryformatversion = 0
        filemode = true
        bare = false
        logallrefupdates = true
[remote "origin"]
        url = https://github.com/chiahao/MyProj.git
        fetch = +refs/heads/*:refs/remotes/origin/*
[branch "master"]
        remote = origin
        merge = refs/heads/master

3. Relate to Svn

git svn init [svn url]  

will add some content to .git/config:

...  
[svn-remote "svn"]
        url = https://svn-server/MyProj
        fetch = :refs/remotes/git-svn   

4. Update Ref

git update-ref refs/remotes/git-svn refs/remotes/origin/[`master` or other branch name]  
git svn rebase

This is the secret sauce! What I’m doing here is updating the HEAD of the git-svn remote
(refs/remotes/git-svn, this is created for you by doing the “git svn init”) to match the HEAD I grabbed from github
(refs/remotes/origin/[master], again this is created for you by doing the “git clone”).