通常情况下，git svn clone可以很好的完成任务。比如转换Google v8

git svn clone -s http://v8.googlecode.com/svn/ v8

但是最近experimental branch发生了变化，git svn fetch无法继续。其实我们完全可以忽略这个branch，方法是枚举所有想要fetch的branch，原来的配置如下：

[svn-remote "svn"]
        url = http://v8.googlecode.com/svn
        fetch = trunk:refs/remotes/trunk
        branches = branches/*:refs/remotes/*
        tags = tags/*:refs/remotes/tags/*

修改后如下：

[svn-remote "svn"]
        url = http://v8.googlecode.com/svn
        fetch = trunk:refs/remotes/trunk
        fetch = branches/bleeding_edge:refs/remotes/bleeding_edge
        tags = tags/*:refs/remotes/tags/*