$ git clone -n https://src.fedoraproject.org/rpms/ck.git /var/lib/mock/f41-build-1290457-23344/root/chroot_tmpdir/scmroot/ck
Cloning into '/var/lib/mock/f41-build-1290457-23344/root/chroot_tmpdir/scmroot/ck'...
$ git fetch origin b11222d0ae35e28f8050fde0ae95bbd356f17e6b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ck
 * [new ref]         b11222d0ae35e28f8050fde0ae95bbd356f17e6b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b11222d Fix tests causing build failure