$ git clone -n https://src.fedoraproject.org/rpms/ocaml-logs.git /var/lib/mock/f38-build-side-42-init-devel-800669-28144/root/chroot_tmpdir/scmroot/ocaml-logs
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-800669-28144/root/chroot_tmpdir/scmroot/ocaml-logs'...
$ git fetch origin a76de5497a5fe0b07d82845ab073718dfe9691c6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-logs
 * [new ref]         a76de5497a5fe0b07d82845ab073718dfe9691c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a76de54 Rebuild OCaml packages for F38