$ git clone -n https://src.fedoraproject.org/rpms/purple-facebook.git /var/lib/mock/f42-build-3421870-45166/root/chroot_tmpdir/scmroot/purple-facebook
Cloning into '/var/lib/mock/f42-build-3421870-45166/root/chroot_tmpdir/scmroot/purple-facebook'...
$ git fetch origin ae843e7e96a47b99153619343e77b7d1f439d43f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/purple-facebook
 * [new ref]         ae843e7e96a47b99153619343e77b7d1f439d43f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ae843e7 Orphaned for 6+ weeks