git-init-db: set up the full default environment
git-init-db: set up the full default environment

Create .git/refs/{heads,tags} and make .git/HEAD be a symlink to
(the as yet non-existent) .git/refs/heads/master.

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git