$ git clone -n https://src.fedoraproject.org/rpms/ocaml-camlimages.git /var/lib/mock/f41-build-820521-152264/root/chroot_tmpdir/scmroot/ocaml-camlimages
Cloning into '/var/lib/mock/f41-build-820521-152264/root/chroot_tmpdir/scmroot/ocaml-camlimages'...
$ git fetch origin 3891dae2caadf4210d772a03339f250c48442f75:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-camlimages
 * [new ref]         3891dae2caadf4210d772a03339f250c48442f75 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3891dae OCaml 5.2.0 ppc64le fix