$ git clone -n https://github.com/xcp-ng-rpms/ocaml-findlib /var/lib/mock/v9.0-u-ydi1-11084-29516/root/chroot_tmpdir/scmroot/ocaml-findlib
Cloning into '/var/lib/mock/v9.0-u-ydi1-11084-29516/root/chroot_tmpdir/scmroot/ocaml-findlib'...
$ git fetch origin 1664f187d03355691c69e26d3799d913b2e6f566:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/ocaml-findlib
 * [new ref]         1664f187d03355691c69e26d3799d913b2e6f566 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1664f18 bump release for test build