$ git clone -n https://github.com/xcp-ng-rpms/ocaml /var/lib/mock/v9.0-u-ydi1-11161-29572/root/chroot_tmpdir/scmroot/ocaml
Cloning into '/var/lib/mock/v9.0-u-ydi1-11161-29572/root/chroot_tmpdir/scmroot/ocaml'...
$ git fetch origin 64bc93a1533074b0121a48da57ca224122c2f027:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/ocaml
 * [new ref]         64bc93a1533074b0121a48da57ca224122c2f027 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 64bc93a bump release for test build