$ git clone -n https://src.fedoraproject.org/rpms/rubiks.git /var/lib/mock/f41-build-side-1-2663351-28878/root/chroot_tmpdir/scmroot/rubiks
Cloning into '/var/lib/mock/f41-build-side-1-2663351-28878/root/chroot_tmpdir/scmroot/rubiks'...
$ git fetch origin eef2462a8454916d70ba72891d84efdd3e3036c1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubiks
 * [new ref]         eef2462a8454916d70ba72891d84efdd3e3036c1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eef2462 Orphaned for 6+ weeks