Developing Chimera with git

I started out developing an extension for Chimera with a ​git repository. It was possible to import the git repository history into the Chimera ​subversion repository, using some instructions from ​google code. I ran the following:

#
# Step 1.  Create a git svn clone of the Chimera source.
#
cd /data/src/
mkdir tmp
cd tmp/
git svn clone svn+ssh://plato.cgl.ucsf.edu/usr/local/src/svn/chimera/trunk chimera
# Wait a long time for this to catch up on 30000+ commits
cd chimera
git status
# Fetch the git repository for my Chimera extension; this does not merge anything.
git fetch ssh://weber.cgl.ucsf.edu/data/gitroot/chimera-extension
# Create a temporary branch for the fetched repository, and tag its head:
git branch tmp $(cut -b-40 .git/FETCH_HEAD)
git tag -a -m "Animation last fetch" last tmp
#
# Step 2.  Apply initial commit from my git repository onto the git-svn
#
INIT_COMMIT=$(git log tmp --pretty=format:%H | tail -1)
git checkout $INIT_COMMIT .
git commit -C $INIT_COMMIT
#
# Step 3.  Rebase and submit
#
# Apply all the other commits to the tmp branch; make it the new master branch.
git rebase master tmp
git branch -M tmp master
# Lastly, commit the changes back to the svn repository
git svn dcommit