$ git clone -n https://src.fedoraproject.org/rpms/qrq.git /var/lib/mock/f42-build-3465195-45737/root/chroot_tmpdir/scmroot/qrq
Cloning into '/var/lib/mock/f42-build-3465195-45737/root/chroot_tmpdir/scmroot/qrq'...
$ git fetch origin ef6c039cb6f510c2da8c4be51ebedcbde01cf21b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qrq
 * [new ref]         ef6c039cb6f510c2da8c4be51ebedcbde01cf21b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ef6c039 Orphaned for 6+ weeks