$ git clone -n https://git.cclinux.org/stage/rpms/libuser.git /var/lib/mock/dist-circle8-build-97912-46728/root/chroot_tmpdir/scmroot/libuser
Cloning into '/var/lib/mock/dist-circle8-build-97912-46728/root/chroot_tmpdir/scmroot/libuser'...
$ git fetch origin ae538b437bacd1dc849e01441c6f24faa72c442e:KOJI_FETCH_HEAD
From https://git.cclinux.org/stage/rpms/libuser
 * [new ref]         ae538b437bacd1dc849e01441c6f24faa72c442e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ae538b4 import libuser-0.62-25.el8