$ git clone -n https://src.fedoraproject.org/rpms/ocaml-cryptokit.git /var/lib/mock/f38-build-side-42-init-devel-773971-27772/root/chroot_tmpdir/scmroot/ocaml-cryptokit
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-773971-27772/root/chroot_tmpdir/scmroot/ocaml-cryptokit'...
$ git fetch origin 23d7879a1fc642a8c616dbad3755f297a935b491:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-cryptokit
 * [new ref]         23d7879a1fc642a8c616dbad3755f297a935b491 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 23d7879 Bump release and rebuild