$ git clone -n https://src.fedoraproject.org/rpms/ocaml-result.git /var/lib/mock/f38-build-side-42-init-devel-646477-26423/root/chroot_tmpdir/scmroot/ocaml-result
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-646477-26423/root/chroot_tmpdir/scmroot/ocaml-result'...
$ git fetch origin 03090dd4d45624a80714671d6f9926e5b23d4eed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-result
 * [new ref]         03090dd4d45624a80714671d6f9926e5b23d4eed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 03090dd Rebuild OCaml packages for F38