add release.sh to make release process easier

release.sh

@@ -0,0 +1,185 @@
+#!/usr/bin/env bash
+
+#set -x
+set -eu
+set -o pipefail
+
+check-git-branches(){
+    if [ "$(git rev-parse --abbrev-ref HEAD)" != "main" ]; then
+        echo "ERROR: call me from the main branch."
+        exit 1
+    fi
+    if [ "$(git rev-parse main)" != $(git rev-parse origin/main) ]; then
+        echo "ERROR: run 'git pull' beforehand."
+        exit 1
+    fi
+}
+
+list-prs(){
+    commit_range=$1
+    shift
+    # Get the commits related to the topic.
+    git log --pretty=%h $commit_range -- "$@" | \
+        # Group the commits in sets of 10.
+        awk 'NR == 1 { a = $1 } NR != 1 && NR % 10 == 1 { print a; a = $1 } { a = a "," $1 } END { print a }' | \
+        # Get the PRs of the commits.
+        xargs -I@ gh pr list -s all -S @ --json mergedAt,title,url,author | \
+        # Format the ChangeLog messages using the PRs info.
+        jq -r '.[] | .mergedAt+"* "+.title+" by @"+.author.login+" in "+.url' | \
+        sort -u | \
+        sed -r 's/^[^*]+//'
+}
+
+get-mantle-latest-tag(){
+    git describe --tags --abbrev=0 --match='v*' | sed 's/^v//'
+}
+
+case-mantle(){
+    check-git-branches
+
+    # Check Mantle's changes
+    MANTLE_LATEST_TAG=$(get-mantle-latest-tag)
+    MANTLE_PRS=$(list-prs v$MANTLE_LATEST_TAG...HEAD . ":^charts")
+    if [ "$MANTLE_PRS" = "" ]; then
+        echo "You don't have to release Mantle, but HANG ON!"
+        echo "You may need to release its Helm Charts. Please run '$0 mantle-helm-chart'."
+    else
+        echo "What's Changed:"
+        echo
+        echo "$MANTLE_PRS"
+        echo
+        echo "The current version is" $MANTLE_LATEST_TAG
+        echo -n "Next version? (only numbers and dots accepted) "
+        read NEXT_MANTLE_VERSION
+        echo "Run the following code:"
+        echo
+        echo -e "\tgit switch main"
+        echo -e "\tgit pull"
+        echo -e "\tgit tag v${NEXT_MANTLE_VERSION}"
+        echo -e "\tgit push origin v${NEXT_MANTLE_VERSION}"
+        echo
+        echo "Then, CI will draft a new release, so edit it to publish it."
+        echo "After that, please run '$0 mantle-helm-chart'"
+        echo
+        echo "Please see RELEASE.md for the details."
+    fi
+}
+
+case-mantle-helm-chart(){
+    check-git-branches
+
+    # Check mantle Helm Chart changes
+    MANTLE_HELM_CHART_LATEST_TAG=$(git describe --tags --abbrev=0 --match='mantle-chart-*')
+    MANTLE_HELM_CHART_PRS=$(list-prs $MANTLE_HELM_CHART_LATEST_TAG...HEAD charts/mantle)
+
+    MANTLE_LATEST_TAG=$(get-mantle-latest-tag)
+    MANTLE_CURRENT_APP_VERSION_IN_CHART=$(cat charts/mantle/Chart.yaml | yq .appVersion)
+
+    if [ "$MANTLE_HELM_CHART_PRS" = "" ] && [ "$MANTLE_CURRENT_APP_VERSION_IN_CHART" = "$MANTLE_LATEST_TAG" ]; then
+        echo "You don't have to release mantle Helm Chart."
+    else
+        echo "What's Changed:"
+        echo
+        if [ "$MANTLE_HELM_CHART_PRS" != "" ]; then
+            echo "$MANTLE_HELM_CHART_PRS"
+        fi
+        if [ "$MANTLE_CURRENT_APP_VERSION_IN_CHART" != "$MANTLE_LATEST_TAG" ]; then
+            echo "(* A new app version is released)"
+        fi
+        echo
+        echo "The detected Mantle version is" $MANTLE_LATEST_TAG
+        echo "The current version is" $MANTLE_HELM_CHART_LATEST_TAG
+        echo -n "Next version (only numbers and dots accepted)? "
+        read MANTLE_HELM_CHART_NEXT_VERSION
+        echo "Run the following code:"
+        echo
+        echo -e "\tAPPVERSION=$MANTLE_LATEST_TAG"
+        echo -e "\tCHARTVERSION=$MANTLE_HELM_CHART_NEXT_VERSION"
+        echo -e "\tgit switch main"
+        echo -e "\tgit pull"
+        echo -e "\tgit switch -c bump-mantle-chart-\${CHARTVERSION}"
+        echo -e "\tsed -r -i" '"s/appVersion: \"[[:digit:]]+\.[[:digit:]]+\.[[:digit:]]+\"/appVersion: \"${APPVERSION}\"/g" charts/mantle/Chart.yaml'
+        echo -e "\tsed -r -i" '"s/^version: [[:digit:]]+\.[[:digit:]]+\.[[:digit:]]+/version: ${CHARTVERSION}/g" charts/mantle/Chart.yaml'
+        echo -e "\tgit commit -a -s -m" '"Bump mantle chart version to ${CHARTVERSION}"'
+        echo -e "\tgit push --set-upstream origin bump-mantle-chart-\${CHARTVERSION}"
+        echo
+        echo "Then,"
+        echo "1. Create a PR and merge it."
+        echo "2. Run CI https://github.com/cybozu-go/mantle/actions/workflows/helm-release.yaml to release the new Helm Chart."
+        echo "3. Edit the release note."
+        echo "4. Run '$0 mantle-cluster-wide-helm-chart'"
+        echo
+        echo "Please see RELEASE.md for the details."
+    fi
+}
+
+case-mantle-cluster-wide-helm-chart(){
+    check-git-branches
+
+    # Check mantle-cluster-wide Helm Chart changes
+    MANTLE_CLUSTER_WIDE_HELM_CHART_LATEST_TAG=$(git describe --tags --abbrev=0 --match='mantle-cluster-wide-chart-*')
+    MANTLE_CLUSTER_WIDE_HELM_CHART_PRS=$(list-prs $MANTLE_CLUSTER_WIDE_HELM_CHART_LATEST_TAG...HEAD charts/mantle-cluster-wide)
+
+    if [ "$MANTLE_CLUSTER_WIDE_HELM_CHART_PRS" = "" ]; then
+        echo "You don't have to release mantle-cluster-wide Helm Chart."
+    else
+        echo "What's Changed:"
+        echo
+        echo "$MANTLE_CLUSTER_WIDE_HELM_CHART_PRS"
+        echo
+        echo "The current version is" $MANTLE_CLUSTER_WIDE_HELM_CHART_LATEST_TAG
+        echo -n "Next version (only numbers and dots accepted)? "
+        read MANTLE_CLUSTER_WIDE_HELM_CHART_NEXT_VERSION
+        echo "Run the following code:"
+        echo
+        MANTLE_LATEST_TAG=$(get-mantle-latest-tag)
+        echo -e "\tAPPVERSION=$MANTLE_LATEST_TAG"
+        echo -e "\tCHARTVERSION=$MANTLE_CLUSTER_WIDE_HELM_CHART_NEXT_VERSION"
+        echo -e "\tgit switch main"
+        echo -e "\tgit pull"
+        echo -e "\tgit" 'switch -c bump-mantle-cluster-wide-chart-${CHARTVERSION}'
+        echo -e "\tsed" '-r -i "s/appVersion: \"[[:digit:]]+\.[[:digit:]]+\.[[:digit:]]+\"/appVersion: \"${APPVERSION}\"/g" charts/mantle-cluster-wide/Chart.yaml'
+        echo -e "\tsed" '-r -i "s/^version: [[:digit:]]+\.[[:digit:]]+\.[[:digit:]]+/version: ${CHARTVERSION}/g" charts/mantle-cluster-wide/Chart.yaml'
+        echo -e "\tgit" 'commit -a -s -m "Bump mantle-cluster-wide chart version to ${CHARTVERSION}"'
+        echo -e "\tgit" 'push --set-upstream origin bump-mantle-cluster-wide-chart-${CHARTVERSION}'
+        echo
+        echo "Then,"
+        echo "1. Create a PR and merge it."
+        echo "2. Run CI https://github.com/cybozu-go/mantle/actions/workflows/helm-release.yaml to release the new Helm Chart."
+        echo "3. Edit the release note."
+        echo
+        echo "Please see RELEASE.md for the details."
+    fi
+}
+
+case "$@" in
+mantle )
+    case-mantle
+    ;;
+
+mantle-helm-chart )
+    case-mantle-helm-chart
+    ;;
+
+mantle-cluster-wide-helm-chart )
+    case-mantle-cluster-wide-helm-chart
+    ;;
+
+* )
+    echo "Usage: $0 <command>"
+    echo
+    cat <<EOS
+This script helps the maintainers release Mantle and its Helm Charts. It checks
+that there are some changes to be released, then prints instructions to release
+them if necessary.
+
+Commands:
+  mantle:
+    Print instructions to release Mantle.
+  mantle-helm-chart:
+    Print instructions to release mantle Helm Chart.
+  mantle-cluster-wide-helm-chart:
+    Print instructions to release mantle-cluster-wide Helm Chart.
+EOS
+    ;;
+esac