$ git clone -n https://src.fedoraproject.org/rpms/ocaml-mmap.git /var/lib/mock/f38-build-side-42-init-devel-695022-26981/root/chroot_tmpdir/scmroot/ocaml-mmap
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-695022-26981/root/chroot_tmpdir/scmroot/ocaml-mmap'...
$ git fetch origin 18caf498f76a3474c4176799e17076acfc1b7f31:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-mmap
 * [new ref]         18caf498f76a3474c4176799e17076acfc1b7f31 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 18caf49 Rebuild OCaml packages for F38