$ git clone -n https://src.fedoraproject.org/rpms/planets.git /var/lib/mock/f45-build-28570-631/root/chroot_tmpdir/scmroot/planets
Cloning into '/var/lib/mock/f45-build-28570-631/root/chroot_tmpdir/scmroot/planets'...
$ git fetch origin 873d0d3954ef067da7ed65c960e6a6216221ceff:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/planets
 * [new ref]         873d0d3954ef067da7ed65c960e6a6216221ceff -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 873d0d3 OCaml 5.5.1 rebuild