$ git clone -n https://src.fedoraproject.org/rpms/ocaml-merlin.git /var/lib/mock/f39-build-1789949-41739/root/chroot_tmpdir/scmroot/ocaml-merlin
Cloning into '/var/lib/mock/f39-build-1789949-41739/root/chroot_tmpdir/scmroot/ocaml-merlin'...
$ git fetch origin debc43ac45b4b4337c4974c35de0ebbc914fe857:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml-merlin
 * [new ref]         debc43ac45b4b4337c4974c35de0ebbc914fe857 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at debc43a Version 4.12