$ git clone -n https://src.fedoraproject.org/rpms/ocaml-jane-street-headers.git /var/lib/mock/f38-build-side-42-init-devel-686558-26759/root/chroot_tmpdir/scmroot/ocaml-jane-street-headers
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-686558-26759/root/chroot_tmpdir/scmroot/ocaml-jane-street-headers'...
$ git fetch origin 437e2201d3e77db02ba3a68ac73986f5ff817e84:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-jane-street-headers
 * [new ref]         437e2201d3e77db02ba3a68ac73986f5ff817e84 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 437e220 Disable build notes