Merge pull request #2613 from ashish-amarnath/changelog-check

🏃‍♂️Add a CI check for changelog file

.github/workflows/pr-changelog-check.yml

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+name: Pull Request Changelog Check
+on: [pull_request]
+jobs:
+
+  build:
+    name: Run Changelog Check
+    runs-on: ubuntu-latest
+    steps:
+
+    - name: Check out the code
+      uses: actions/checkout@v2
+
+    - name: Changelog check
+      run: ./hack/changelog-check.sh

changelogs/unreleased/2613-ashish-amarnath

@@ -0,0 +1 @@
+add a CI check for a changelog file

hack/changelog-check.sh

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+#!/bin/bash
+
+# Copyright 2020 the Velero contributors.
+#
+# 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.
+
+# docker-push is invoked by the CI/CD system to deploy docker images to Docker Hub.
+# It will build images for all commits to master and all git tags.
+# The highest, non-prerelease semantic version will also be given the `latest` tag.
+
+set +x
+
+if [[ -z "$CI" ]]; then
+   echo "This script is intended to be run only on Github Actions." >&2
+   exit 1
+fi
+
+CHANGELOG_PATH='changelogs/unreleased'
+
+# https://help.github.com/en/actions/reference/events-that-trigger-workflows#pull-request-event-pull_request
+# GITHUB_REF is something like "refs/pull/:prNumber/merge"
+pr_number=$(echo $GITHUB_REF | cut -d / -f 3)
+
+change_log_file="${CHANGELOG_PATH}/${pr_number}-*"
+
+if ls ${change_log_file} 1> /dev/null 2>&1; then
+    echo "changelog for PR ${pr_number} exists"
+    exit 0
+else
+    echo "PR ${pr_number} is missing a changelog. Please refer https://velero.io/docs/master/code-standards/#adding-a-changelog and add a changelog."
+    exit 1
+fi
+