New test and commit hook to make sure changes to Godeps are reproducable

It is a pretty slow test (it downloads fresh) all of kube's Godeps, so only
run it when needed in pre-commit hook.

This also means that random changes to other non-kube repositories could
cause travis/shippable to just randomly stop working for all PRs which touch
Godeps after that moment (even though no changes have been made to Godeps by
us).  Examples would be things like other repos completely disappearing. Or
even the directory we include disappearing in master in the remote
project (even though the directory may exist at the commit we care
about) This is a bugwin godep, but it is a problem we have seen happen
with kube Godeps.

.travis.yml

@@ -23,6 +23,7 @@ script:
   - ./hack/verify-swagger-spec.sh
   - ./hack/verify-linkcheck.sh
   - ./hack/verify-flags-underscore.py
+  - ./hack/verify-godeps.sh $TRAVIS_BRANCH
 
 notifications:
   irc: "chat.freenode.net#kubernetes-dev"

hack/verify-godeps.sh

@@ -0,0 +1,74 @@
+#!/bin/bash
+
+# Copyright 2015 The Kubernetes Authors All rights reserved.
+#
+# 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.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+KUBE_ROOT=$(dirname "${BASH_SOURCE}")/..
+source "${KUBE_ROOT}/hack/lib/init.sh"
+
+branch="${1:-master}"
+# notice this uses ... to find the first shared ancestor
+if ! git diff origin/"${branch}"...HEAD | grep 'Godeps/' > /dev/null; then
+  exit 0
+fi
+
+# create a nice clean place to put our new godeps
+_tmpdir="$(mktemp -d -t gopath.XXXXXX)"
+function cleanup {
+  echo "Removing ${_tmpdir}"
+  rm -rf "${_tmpdir}"
+}
+trap cleanup EXIT
+
+# build the godep tool
+export GOPATH="${_tmpdir}"
+go get -u github.com/tools/godep 2>/dev/null
+go install github.com/tools/godep 2>/dev/null
+GODEP="${_tmpdir}/bin/godep"
+
+# fill out that nice clean place with the kube godeps
+echo "Starting to download all kubernetes godeps. This takes a while"
+"${GODEP}" restore
+echo "Download finished"
+
+# copy the contents of your kube directory into the nice clean place
+_kubetmp="${_tmpdir}/src/k8s.io/"
+mkdir -p "${_kubetmp}"
+#should create ${_kubectmp}/kubernetes
+git archive --format=tar --prefix=kubernetes/ $(git write-tree) | (cd "${_kubetmp}" && tar xf -)
+_kubetmp="${_kubetmp}/kubernetes"
+
+# destroy godeps in our COPY of the kube tree
+pushd "${_kubetmp}" > /dev/null
+rm -rf ./Godeps
+
+# for some reason the kube tree needs to be a git repo for the godep tool to run. Doesn't make sense
+git init > /dev/null 2>&1
+
+# recreate the Godeps using the nice clean set we just downloaded
+"${GODEP}" save ./...
+popd > /dev/null
+
+# Check for any (meaninful) differences between the godeps in the tree and this nice clean one we just built
+if ! _out="$(diff -NIaupr --ignore-matching-lines='^\s*\"GoVersion\":' --ignore-matching-lines='^\s*\"Comment\":' ${KUBE_ROOT}/Godeps/ ${_kubetmp}/Godeps/)"; then
+  echo "Your godeps changes are not reproducable"
+  echo "${_out}"
+  exit 1
+fi
+
+# ex: ts=2 sw=2 et filetype=sh

hooks/pre-commit

@@ -16,6 +16,20 @@ else
 fi
 echo "${reset}"
 
+# Check if changes to Godeps are reproducable...
+files=($(git diff --cached --name-only --diff-filter ACM | grep "Godeps"))
+if [[ "${#files[@]}" -ne 0 ]]; then
+  echo -ne "Check if changes to Godeps are reproducable (this is pretty slow)..."
+  if ! OUT=$("hack/verify-godeps.sh" 2>&1); then
+    echo
+    echo "${red}${OUT}"
+    exit_code=1
+  else
+    echo "${green}OK"
+  fi
+  echo "${reset}"
+fi
+
 echo -ne "Checking for files that need gofmt... "
 files_need_gofmt=()
 files=($(git diff --cached --name-only --diff-filter ACM | grep "\.go" | grep -v -e "third_party" -e "Godeps"))

shippable.yml

@@ -33,6 +33,7 @@ install:
   - ./hack/verify-boilerplate.sh
   - ./hack/verify-description.sh
   - ./hack/verify-flags-underscore.py
+  - ./hack/verify-godeps.sh ${BASE_BRANCH}
   - ./hack/travis/install-std-race.sh
   - ./hack/verify-generated-conversions.sh
   - ./hack/verify-generated-deep-copies.sh