git tool to keep a subversion mirror

Johannes Sixt wrote:

It is extremely difficult to tell whether the patch makes sense or is
correct, if there is _no_ explanation what it is good for.

I agree 100%. I sent a fore-letter using git-send-email, but all parts got split. 

Pasting it manually:

I am actively using git for my project. Thanks everyone envolved.

However, I got tired of administering own web server and registered my
project at sourceforge. Unlike repo.or.cz (thanks again for everyone
envolved), they do not provide git hosting. But a project without a
source repository is non-sence.

I am not in any way going to use Subversion after I tried git, but I
need to be able to export to a Subversion repository. I found an
excellent tool called 'git-svn'. However, the flawed nature of
Subversion put shackles on normal git usage after you do 'git-svn init'.

Since git is the best scm system, my situation is probably quite common.
So I am filing these patches.

There is a 'git-svn' command which does want I need, so I created a
simple wrapper around it. I also found that 'git-svn commit-diff' is
having a small trouble dealing with root <tree-ish>, which is corrected
by an attached patch.