$ git clone -n https://src.fedoraproject.org/rpms/xaos.git /var/lib/mock/f42-build-side-1-3555806-46656/root/chroot_tmpdir/scmroot/xaos
Cloning into '/var/lib/mock/f42-build-side-1-3555806-46656/root/chroot_tmpdir/scmroot/xaos'...
$ git fetch origin 03cc2fe8fb051ef50b8dd7832df35b6ed1d076bc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xaos
 * [new ref]         03cc2fe8fb051ef50b8dd7832df35b6ed1d076bc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 03cc2fe A little housekeeping