$ git clone -n https://src.fedoraproject.org/rpms/ocaml.git /var/lib/mock/f40-build-2077242-49563/root/chroot_tmpdir/scmroot/ocaml
Cloning into '/var/lib/mock/f40-build-2077242-49563/root/chroot_tmpdir/scmroot/ocaml'...
$ git fetch origin 4f34985ad8b10ed92e98b7115d7fedff1948bee9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml
 * [new ref]         4f34985ad8b10ed92e98b7115d7fedff1948bee9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4f34985 Add s390x code generation fix