$ git clone -n https://src.fedoraproject.org/rpms/ocaml-merlin.git /var/lib/mock/f42-build-866071-173700/root/chroot_tmpdir/scmroot/ocaml-merlin
Cloning into '/var/lib/mock/f42-build-866071-173700/root/chroot_tmpdir/scmroot/ocaml-merlin'...
$ git fetch origin 5bf568cd573e18ce0ec2ce5305dc320228e622e6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-merlin
 * [new ref]         5bf568cd573e18ce0ec2ce5305dc320228e622e6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5bf568c OCaml 5.3.0 rebuild for Fedora 42