$ git clone -n https://src.fedoraproject.org/rpms/bidiv.git /var/lib/mock/f40-build-2208793-52141/root/chroot_tmpdir/scmroot/bidiv
Cloning into '/var/lib/mock/f40-build-2208793-52141/root/chroot_tmpdir/scmroot/bidiv'...
$ git fetch origin 8cdce78df95a58b44c4ac5f612688451e54c1500:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bidiv
 * [new ref]         8cdce78df95a58b44c4ac5f612688451e54c1500 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8cdce78 Orphaned for 6+ weeks