$ git subtree pull --prefix=release-tools https://github.com/kubernetes-csi/csi-release-tools.git master
git-subtree-dir: release-tools git-subtree-mainline: 21ce5ebe0356781b55e4940ae4b03c267822dcdc git-subtree-split: 33d58fdc29b90120bf16e536042379251f8631f2