$ git clone -n https://src.fedoraproject.org/rpms/python-rebulk.git /var/lib/mock/f40-build-2249698-54016/root/chroot_tmpdir/scmroot/python-rebulk
Cloning into '/var/lib/mock/f40-build-2249698-54016/root/chroot_tmpdir/scmroot/python-rebulk'...
$ git fetch origin b1cb7025666b677d5136e379846a28dbc5e6dab4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-rebulk
 * [new ref]         b1cb7025666b677d5136e379846a28dbc5e6dab4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1cb702 Version 3.3.0 (rhbz#2254798)