return None
-def update_ref(refname, newval, oldval):
+def update_ref(refname, newval, oldval, repo_dir=None):
"""Change the commit pointed to by a branch."""
if not oldval:
oldval = ''
assert(refname.startswith('refs/heads/'))
p = subprocess.Popen(['git', 'update-ref', refname,
newval.encode('hex'), oldval.encode('hex')],
- preexec_fn = _gitenv())
+ preexec_fn = _gitenv(repo_dir))
_git_wait('git update-ref', p)