$ git clone -n https://src.fedoraproject.org/rpms/ocaml.git /var/lib/mock/f40-build-739540-109072/root/chroot_tmpdir/scmroot/ocaml
Cloning into '/var/lib/mock/f40-build-739540-109072/root/chroot_tmpdir/scmroot/ocaml'...
$ git fetch origin 2ec55e949b92244d2b119f71e83c38a5ea878efc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml
 * [new ref]         2ec55e949b92244d2b119f71e83c38a5ea878efc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2ec55e9 Use BR ocaml-srpm-macros to force latest to be built against