From 517cf9ed2da712cfc8049b262e22f5b10806ac48 Mon Sep 17 00:00:00 2001
From: Marco Franssen <marco.franssen@gmail.com>
Date: Mon, 6 Mar 2023 20:32:00 +0100
Subject: [PATCH] Add script to automate cutting a release

Signed-off-by: Marco Franssen <marco.franssen@gmail.com>
---
 release-chart.sh | 135 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100755 release-chart.sh

diff --git a/release-chart.sh b/release-chart.sh
new file mode 100755
index 0000000..99fbf7e
--- /dev/null
+++ b/release-chart.sh
@@ -0,0 +1,135 @@
+#!/usr/bin/env bash
+##
+## USAGE: __PROG__
+##
+## __PROG__ prepares a release
+##
+## Usage example(s):
+##
+##   ./__PROG__ --chart spire --current-version 0.3.0 --new-version 0.4.0
+##
+## Options:
+##    --help                  Show this help message
+##    --chart                 The chart to release
+##    --current-version       The current version number
+##    --new-version           The new version number
+##    --dry-run               Will not actually submit the PR
+##
+## Prerequisites:
+##   - gsed (MacOS)
+##   - git
+##   - GitHub CLI (gh)
+##
+## Commands
+##
+##   ./__PROG__ --chart «chart» --current-version «current-version» --new-version «new-version» [--dry-run]
+me=$(basename "$0")
+
+function usage {
+  grep '^##' "$0" | sed -e 's/^##//' -e "s/__PROG__/$me/" >&2
+}
+
+function print_error {
+  echo >&2
+  echo >&2 "  ❌ ${*}"
+}
+
+function print_error_and_exit {
+  print_error "${*}"
+  exit 1
+}
+
+while (("$#")); do
+  case "$1" in
+  --help)
+    usage
+    exit 0
+    ;;
+  --chart)
+    chart=$2
+    shift 2
+    ;;
+  --current-version)
+    current_version=$2
+    shift 2
+    ;;
+  --new-version)
+    new_version=$2
+    shift 2
+    ;;
+  --dry-run)
+    dry_run='-w'
+    shift 1
+    ;;
+  *)
+    usage
+    print_error_and_exit 'unexpected option'
+    ;;
+  esac
+done
+
+command -v gh >/dev/null 2>&1 || {
+  print_error_and_exit 'the GitHub cli (gh) is required to run this script'
+}
+
+if [[ $OSTYPE == "darwin"* ]]; then
+  command -v gsed >/dev/null 2>&1 || {
+    print_error_and_exit 'gsed is required to run this script'
+  }
+  SED='gsed'
+else
+  SED='sed'
+fi
+
+if [ -z "$chart" ]; then
+  usage
+  print_error_and_exit 'chart option is missing'
+fi
+
+if [ -z "$current_version" ]; then
+  usage
+  print_error_and_exit 'current-version option is missing'
+fi
+
+if [ -z "$new_version" ]; then
+  usage
+  print_error_and_exit 'new-version option is missing'
+fi
+
+if [ ! -f "charts/${chart}/Chart.yaml" ] ; then
+  print_error_and_exit "no chart named '${chart}' in charts folder"
+fi
+
+git checkout main
+git pull
+git checkout --track -B "bump-${chart}-version" main
+commits_since_previous_release="$(git log "${chart}-${current_version}..HEAD" --pretty=format:'* %h %s')"
+"${SED}" -i "s/version: ${current_version}/version: ${new_version}/" "charts/${chart}/Chart.yaml"
+./helm-docs.sh
+git add "charts/${chart}/"{Chart.yaml,README.md}
+git commit -m "Bump ${chart} Helm Chart version from ${current_version} to ${new_version}" \
+  -m "${commits_since_previous_release}" \
+  -s
+git push -u origin --force-with-lease
+
+cat <<EOF | gh pr create --base main --body-file - "${dry_run}"
+Please review the below changelog to ensure this matches up with the semantic version being applied.
+
+> **Note**: **Maintainers** ensure to run following after merging this PR to trigger the release workflow:
+>
+> \`\`\`shell
+> git checkout main
+> git pull
+> git checkout release
+> git pull
+> git merge main
+> git push
+> \`\`\`
+
+**Changes in this release**
+
+${commits_since_previous_release}
+EOF
+
+gh pr merge --auto -r -d
+git checkout main