$ git clone -n https://src.fedoraproject.org/rpms/ocaml-variantslib.git /var/lib/mock/f38-build-side-42-init-devel-628381-26370/root/chroot_tmpdir/scmroot/ocaml-variantslib
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-628381-26370/root/chroot_tmpdir/scmroot/ocaml-variantslib'...
$ git fetch origin 052c0ab506269aa3252cd73dff08dd99b7d98ed3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-variantslib
 * [new ref]         052c0ab506269aa3252cd73dff08dd99b7d98ed3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 052c0ab Rebuild OCaml packages for F38