$ git clone -n https://github.com/xcp-ng-rpms/ocaml-findlib /var/lib/mock/v9.0-u-ydi1-11081-29488/root/chroot_tmpdir/scmroot/ocaml-findlib
Cloning into '/var/lib/mock/v9.0-u-ydi1-11081-29488/root/chroot_tmpdir/scmroot/ocaml-findlib'...
$ git fetch origin 53acb14a74d7881cafd60f7b0ebe173628cb3823:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/ocaml-findlib
 * [new ref]         53acb14a74d7881cafd60f7b0ebe173628cb3823 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 53acb14 bump release for test build