add sync script

filter-branch-sha

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+6199f55735ed1e5b67822be7be058c3890818b5a

hack/sync-from-kubernetes.sh

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+#!/bin/bash
+
+# Copyright 2017 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+# overall flow
+# 1. fetch the current level of k8s.io/kubernetes
+# 2. check out the k8s.io/kubernetes HEAD into a separate branch
+# 3. rewrite the history on that branch to *only* include staging/src/k8s.io/apiserver
+# 4. locate all commits between the last time we sync'ed and now
+# 5. switch back to the starting branch
+# 6. for each commit, cherry-pick it (which will keep authorship) into current branch
+# 7. update metadata files indicating which commits we've sync'ed to
+
+set -e
+
+dir=$(mktemp -d "${TMPDIR:-/tmp/}$(basename 0).XXXXXXXXXXXX")
+
+git remote add upstream-kube git@github.com:kubernetes/kubernetes.git  || true
+git fetch upstream-kube
+
+currBranch=$(git rev-parse --abbrev-ref HEAD)
+previousKubeSHA=$(cat kubernetes-sha)
+previousBranchSHA=$(cat filter-branch-sha)
+
+git branch -D kube-sync || true
+git checkout upstream-kube/master -b kube-sync
+git reset --hard upstream-kube/master
+newKubeSHA=$(git log --oneline --format='%H' kube-sync -1)
+
+# this command rewrite git history to *only* include staging/src/k8s.io/apiserver
+git filter-branch -f --subdirectory-filter staging/src/k8s.io/apiserver HEAD
+
+newBranchSHA=$(git log --oneline --format='%H' kube-sync -1)
+git log --no-merges --format='%H' --reverse ${previousBranchSHA}..HEAD > ${dir}/commits
+
+git checkout ${currBranch}
+
+while read commitSHA; do
+	echo "working ${commitSHA}"
+	git cherry-pick ${commitSHA}
+done <${dir}/commits
+
+# track the k8s.io/kubernetes commit SHA so we can always determine which level of kube this repo matches
+# track the filtered branch commit SHA so that we can determine which commits need to be picked
+echo ${newKubeSHA} > kubernetes-sha
+echo ${newBranchSHA} > filter-branch-sha
+git commit -m "sync(k8s.io/kubernetes): ${newKubeSHA}" -- kubernetes-sha filter-branch-sha
+

kubernetes-sha

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+442d2c1404c93613a483742a60ea2e438024135b