$ git clone -n https://github.com/xcp-ng-rpms/ocaml-findlib /var/lib/mock/v9.0-u-ydi1-11188-29583/root/chroot_tmpdir/scmroot/ocaml-findlib
Cloning into '/var/lib/mock/v9.0-u-ydi1-11188-29583/root/chroot_tmpdir/scmroot/ocaml-findlib'...
$ git fetch origin 38ee9b104799e743b712532592911acc9ef54bf0:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/ocaml-findlib
 * [new ref]         38ee9b104799e743b712532592911acc9ef54bf0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 38ee9b1 bump release for test build