$ git clone -n https://github.com/xcp-ng-rpms/ocaml-findlib.git /var/lib/mock/v8.3-u-psafont2-9703-28420/root/chroot_tmpdir/scmroot/ocaml-findlib
Cloning into '/var/lib/mock/v8.3-u-psafont2-9703-28420/root/chroot_tmpdir/scmroot/ocaml-findlib'...
$ git fetch origin e1f7d4c796f3a780e7663e62d6291aeafaab9cd9:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/ocaml-findlib
 * [new ref]         e1f7d4c796f3a780e7663e62d6291aeafaab9cd9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e1f7d4c bump release for test build