$ git clone -n https://src.fedoraproject.org/rpms/ocaml-calendar.git /var/lib/mock/f42-build-865726-173451/root/chroot_tmpdir/scmroot/ocaml-calendar
Cloning into '/var/lib/mock/f42-build-865726-173451/root/chroot_tmpdir/scmroot/ocaml-calendar'...
$ git fetch origin 76805c3b26b2159807059b0afa674eba801e06e2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-calendar
 * [new ref]         76805c3b26b2159807059b0afa674eba801e06e2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 76805c3 OCaml 5.3.0 rebuild for Fedora 42