$ git clone -n https://src.fedoraproject.org/rpms/perl-NetPacket-SpanningTree.git /var/lib/mock/f40-build-2248553-53956/root/chroot_tmpdir/scmroot/perl-NetPacket-SpanningTree
Cloning into '/var/lib/mock/f40-build-2248553-53956/root/chroot_tmpdir/scmroot/perl-NetPacket-SpanningTree'...
$ git fetch origin b91c65d8530c400d77dfdcea7d9d77904e6f2307:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-NetPacket-SpanningTree
 * [new ref]         b91c65d8530c400d77dfdcea7d9d77904e6f2307 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b91c65d Orphaned for 6+ weeks