$ git clone -n https://src.fedoraproject.org/rpms/ocaml-obuild.git /var/lib/mock/f42-build-865525-173241/root/chroot_tmpdir/scmroot/ocaml-obuild
Cloning into '/var/lib/mock/f42-build-865525-173241/root/chroot_tmpdir/scmroot/ocaml-obuild'...
$ git fetch origin c618c32d54120f6caf07e30c6b829806f7279c32:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-obuild
 * [new ref]         c618c32d54120f6caf07e30c6b829806f7279c32 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c618c32 OCaml 5.3.0 rebuild for Fedora 42