$ git clone -n https://src.fedoraproject.org/rpms/python-authheaders.git /var/lib/mock/f45-build-29442-639/root/chroot_tmpdir/scmroot/python-authheaders
Cloning into '/var/lib/mock/f45-build-29442-639/root/chroot_tmpdir/scmroot/python-authheaders'...
$ git fetch origin ba654bc46e0a773ba16a9b4639dbcec1b1b131f2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-authheaders
 * [new ref]         ba654bc46e0a773ba16a9b4639dbcec1b1b131f2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ba654bc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild