git-svn breaks lots with rewriteRoot

[John Goerzen <jgoerzen@complete.org>]

I've trying to work with a remote repo.  I initially git-svn fetched
it using svn://.  Now I have been given svn commit access, which uses
svn+ssh:// on their server.  I edited my .git/config and set url to
the svn+ssh address and rewriteRoot to the svn:// address I wasusing
before.  This appears to work fine for doing more read operations,
such as svn fetch.

I am having a problem, though, with svn dcommit and svn rebase.  I
believe both are related to this rewriteRoot.  When I run either of
these, I see:

Unable to determine upstream SVN information from working tree history

Looking at the working_head_info and find_by_url subs in git-svn, it
appears that neither is considering rewriting.  One of them needs to
be, I believe, rewriting the URL from git-svn-id back to the "true"
URL over on the server.  This causes it to never match any of the
remote sections in .git/config.

I'm not good enough with Perl anymore, and certainly not goot enough
with this program, to whip up a patch.  Can anyone help with this?