$ git clone -n https://src.fedoraproject.org/rpms/ocaml-ppx-deriving-yaml.git /var/lib/mock/f42-build-865977-173613/root/chroot_tmpdir/scmroot/ocaml-ppx-deriving-yaml
Cloning into '/var/lib/mock/f42-build-865977-173613/root/chroot_tmpdir/scmroot/ocaml-ppx-deriving-yaml'...
$ git fetch origin ece3897149850dd38c4eed066edc33da9d3a271d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-ppx-deriving-yaml
 * [new ref]         ece3897149850dd38c4eed066edc33da9d3a271d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ece3897 OCaml 5.3.0 rebuild for Fedora 42