[GitHub] [flink] rmetzger commented on a change in pull request #12708: [FLINK-18125][Azure] Skip e2e execution on docs-only-PRs

[GitBox <gi...@apache.org>]

rmetzger commented on a change in pull request #12708:
URL: https://github.com/apache/flink/pull/12708#discussion_r449130729



##########
File path: tools/azure-pipelines/build_properties.sh
##########
@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+
+
+#
+# Returns 0 if the change is a documentation-only pull request
+#
+function is_docs_only_pullrequest() {
+	# check if it is a pull request branch, as generated by ci-bot:
+	if [[ ! $BUILD_SOURCEBRANCHNAME == ci_* ]] ; then
+		echo "INFO: Branch name mismatch";
+		return 1
+	fi
+	PR_ID=`echo "$BUILD_SOURCEBRANCHNAME" | cut -f2 -d_`
+	if ! [[ "$PR_ID" =~ ^[0-9]+$ ]] ; then
+		echo "ERROR: Extracted PR_ID is not a number, but this: '$PR_ID'"
+	 	return 1
+	fi
+	# check if it is docs only pull request
+	# 1. Get PR details
+	GITHUB_PULL_DETAIL=`curl --silent "https://api.github.com/repos/apache/flink/pulls/$PR_ID"`
+
+	# 2. Check if this build is in sync with the PR
+	GITHUB_PULL_HEAD_SHA=`echo $GITHUB_PULL_DETAIL | jq -r ".head.sha"`
+	THIS_BRANCH_SHA=`git rev-parse HEAD`
+
+	if [[ "$GITHUB_PULL_HEAD_SHA" != "$THIS_BRANCH_SHA" ]] ; then
+		echo "INFO: SHA mismatch: GITHUB_PULL_HEAD_SHA=$GITHUB_PULL_HEAD_SHA != THIS_BRANCH_SHA=$THIS_BRANCH_SHA";
+		# sha mismatch. There's some timing issue, and we can't trust the result
+		return 1
+	fi
+
+	# 3. Get number of commits in PR
+	GITHUB_NUM_COMMITS=`echo $GITHUB_PULL_DETAIL | jq -r ".commits"`
+
+	if [[ $(git diff --name-only $GITHUB_PULL_HEAD_SHA..$GITHUB_PULL_HEAD_SHA~$GITHUB_NUM_COMMITS | grep -v "docs/") == "" ]] ; then
+		echo "INFO: This is a docs only change. Changed files:"
+		git diff --name-only $GITHUB_PULL_HEAD_SHA..$GITHUB_PULL_HEAD_SHA~$GITHUB_NUM_COMMITS

Review comment:
       Somehow, it didn't work. I could not reproduce it locally, but I didn't want to spend more time trying this on CI, because setting up a matching PR is not that simple :) 




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