$ git clone -n https://src.fedoraproject.org/rpms/ocaml.git /var/lib/mock/f42-build-865434-173111/root/chroot_tmpdir/scmroot/ocaml
Cloning into '/var/lib/mock/f42-build-865434-173111/root/chroot_tmpdir/scmroot/ocaml'...
$ git fetch origin 5018fa7019c262dbfb0402f9cc0f1e19b33d16d3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ocaml
 * [new ref]         5018fa7019c262dbfb0402f9cc0f1e19b33d16d3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5018fa7 New upstream version 5.3.0