$ git clone -n https://src.fedoraproject.org/rpms/ocaml-cairo.git /var/lib/mock/f38-build-side-42-init-devel-628187-26370/root/chroot_tmpdir/scmroot/ocaml-cairo
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-628187-26370/root/chroot_tmpdir/scmroot/ocaml-cairo'...
$ git fetch origin b18fe2afd65dd651d9899b3bae14bf5536f852a2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-cairo
 * [new ref]         b18fe2afd65dd651d9899b3bae14bf5536f852a2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b18fe2a Rebuild OCaml packages for F38