$ git clone -n https://src.fedoraproject.org/rpms/zix.git /var/lib/mock/f40-build-2151685-50906/root/chroot_tmpdir/scmroot/zix
Cloning into '/var/lib/mock/f40-build-2151685-50906/root/chroot_tmpdir/scmroot/zix'...
$ git fetch origin 252c660571ec50f50314204029f6f1b5f708d55d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/zix
 * [new ref]         252c660571ec50f50314204029f6f1b5f708d55d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 252c660 Update to 0.4.0