$ git clone -n https://src.fedoraproject.org/rpms/ocaml-camlimages.git /var/lib/mock/f41-build-side-1-3073597-38853/root/chroot_tmpdir/scmroot/ocaml-camlimages
Cloning into '/var/lib/mock/f41-build-side-1-3073597-38853/root/chroot_tmpdir/scmroot/ocaml-camlimages'...
$ git fetch origin 6a196aef425ac9961a65a74dce42387b6b5b6ae7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-camlimages
 * [new ref]         6a196aef425ac9961a65a74dce42387b6b5b6ae7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6a196ae Add patch to fix FTBFS with recent dune versions