$ git clone -n https://src.fedoraproject.org/rpms/zenon.git /var/lib/mock/f39-build-2041216-48346/root/chroot_tmpdir/scmroot/zenon
Cloning into '/var/lib/mock/f39-build-2041216-48346/root/chroot_tmpdir/scmroot/zenon'...
$ git fetch origin 1ab224eb57c96e420c95dc6ed763efbb35446be9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/zenon
 * [new ref]         1ab224eb57c96e420c95dc6ed763efbb35446be9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1ab224e Rebuild for ocaml-zarith 1.13