$ git clone -n https://src.fedoraproject.org/rpms/ocaml-mtime.git /var/lib/mock/f45-build-20637-572/root/chroot_tmpdir/scmroot/ocaml-mtime
Cloning into '/var/lib/mock/f45-build-20637-572/root/chroot_tmpdir/scmroot/ocaml-mtime'...
$ git fetch origin cf780ff8553f8256a11c9e85fc578f4f68525c2a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-mtime
 * [new ref]         cf780ff8553f8256a11c9e85fc578f4f68525c2a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cf780ff OCaml 5.5.1 rebuild