Add script to generate patch release notes

Author: msau42

hack/generate-patch-release-notes.sh

@@ -0,0 +1,97 @@
+#!/bin/bash
+
+# Usage: generate_patch_release_notes.sh
+#
+# Generates and creates commits for GCP CSI driver patch release notes.
+#
+# Required environment variables:
+# CSI_RELEASE_TOKEN: Github token needed for generating release notes
+#
+# Prerequisites:
+# - This script creates and deletes the origin/changelog branch in your git
+# workspace. Make sure you are not using the branch for anything else.
+#
+# Instructions:
+# 1. Update the versions in the $releases array
+# 2. Set environment variables
+# 3. Run the script
+# 4. The script pushes the commits to your origin/changelog branch
+# 5. Make any modifications as needed
+# 6. Create a PR
+#
+# Caveats:
+# - This script doesn't handle regenerating and updating existing branches.
+# - The "--start-rev" option in the release-notes generator is inclusive, which
+# causes the last commit from the last patch to show up in the release notes (if
+# there was a release note). This needs to be manually modified until a solution is found.
+
+set -e
+set -x
+
+repo="gcp-compute-persistent-disk-csi-driver"
+releases=(
+  "1.12.5"
+  "1.11.7"
+  "1.10.12"
+  "1.9.14"
+  "1.8.18"
+  "1.7.19"
+)
+
+function gen_patch_relnotes() {
+  rm out.md || true
+  rm -rf /tmp/k8s-repo || true
+  GITHUB_TOKEN=$CSI_RELEASE_TOKEN \
+  release-notes --start-rev=$3 --end-rev=$2 --branch=$2 \
+    --org=kubernetes-sigs --repo=$1 \
+    --required-author="" --markdown-links --output out.md
+}
+
+script_dir="$(dirname "$(readlink -f "$0")")"
+pushd "$script_dir/../CHANGELOG"
+
+# Create branch
+git fetch upstream
+git checkout master
+git rebase upstream/master
+
+branch="changelog"
+if [ `git rev-parse --verify "$branch" 2>/dev/null` ]; then
+  git branch -D "$branch"
+fi
+git checkout -b $branch
+
+for version in "${releases[@]}"; do
+  # Parse minor and patch version
+  minorPatchPattern="(^[[:digit:]]+\.[[:digit:]]+)\.([[:digit:]]+)"
+  [[ "$version" =~ $minorPatchPattern ]]
+  minor="${BASH_REMATCH[1]}"
+  patch="${BASH_REMATCH[2]}"
+
+  echo $repo $version $minor $patch
+  newVer="v$minor.$patch"
+  prevPatch="$(($patch-1))"
+  prevVer="v$minor.$prevPatch"
+
+  # Generate release notes
+  gen_patch_relnotes $repo release-$minor $prevVer
+  cat > tmp.md <<EOF
+# $newVer - Changelog since $prevVer
+
+EOF
+
+  cat out.md >> tmp.md
+  echo >> tmp.md
+  echo >> tmp.md
+
+  file="CHANGELOG-$minor.md"
+  cat $file >> tmp.md
+  mv tmp.md $file
+
+  git add -u
+  git commit -m "Add changelog for $version"
+done
+
+git push -f origin $branch
+
+popd