$ git clone -n https://src.fedoraproject.org/rpms/python-comm.git /var/lib/mock/f40-build-2230996-53258/root/chroot_tmpdir/scmroot/python-comm
Cloning into '/var/lib/mock/f40-build-2230996-53258/root/chroot_tmpdir/scmroot/python-comm'...
$ git fetch origin cab27e98e49a0abacd97b0b742bfdb60f552728f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-comm
 * [new ref]         cab27e98e49a0abacd97b0b742bfdb60f552728f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cab27e9 Update to 0.2.1 (rhbz#2256468)