$ git clone -n https://src.fedoraproject.org/rpms/ocaml-mtime.git /var/lib/mock/f40-build-783975-133234/root/chroot_tmpdir/scmroot/ocaml-mtime
Cloning into '/var/lib/mock/f40-build-783975-133234/root/chroot_tmpdir/scmroot/ocaml-mtime'...
$ git fetch origin 956c6289001517fd75b6f12005df98cf366b4bb9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-mtime
 * [new ref]         956c6289001517fd75b6f12005df98cf366b4bb9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 956c628 Bump and rebuild