tools: automatically remove lts-watch-* labels

.github/workflows/lint-release-proposal.yml

@@ -92,13 +92,11 @@ jobs:
             "/repos/${GITHUB_REPOSITORY}/compare/v${MAJOR}.x...$GITHUB_SHA" --paginate \
           | node tools/actions/lint-release-proposal-commit-list.mjs "$CHANGELOG_PATH" "$GITHUB_SHA" \
           | while IFS= read -r PR_URL; do
-            DONT_LAND_LABEL="dont-land-on-v${MAJOR}.x" LTS_WATCH_LABEL="lts-watch-v${MAJOR}.x" gh pr view \
+            DONT_LAND_LABEL="dont-land-on-v${MAJOR}.x" gh pr view \
               --json labels,url \
               --jq '
                 if (.labels|any(.name==env.DONT_LAND_LABEL)) then
                   error("\(.url) has the \(env.DONT_LAND_LABEL) label, forbidding it to be in this release proposal")
-                elif (.labels|any(.name==env.LTS_WATCH_LABEL)) then
-                  error("\(.url) has the \(env.LTS_WATCH_LABEL) label, please remove the label now that the PR is included in a release proposal")
                 end
                 ' \
               "$PR_URL" > /dev/null

.github/workflows/remove-lts-watch-label.yml

@@ -0,0 +1,28 @@
+name: Remove `lts-watch-vXX.x` labels
+
+on:
+  push:
+    branches:
+      - v[0-9]+.x
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: false
+
+env:
+  NODE_VERSION: lts/*
+
+permissions:
+  contents: read
+
+jobs:
+  remove-lts-watch-labels:
+    runs-on: ubuntu-slim
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      - name: Parse commits and remove labels
+        run: tools/actions/remove-lts-watch-label.sh
+        env:
+          GH_TOKEN: ${{ github.token }}

tools/actions/remove-lts-watch-label.sh

@@ -0,0 +1,86 @@
+#!/bin/sh
+
+set -ex
+
+[ -n "$GITHUB_SERVER_URL" ] || {
+  echo "Required environment variable GITHUB_SERVER_URL not found" >&2
+  exit 1
+}
+[ -n "$GITHUB_REPOSITORY_OWNER" ] || {
+  echo "Required environment variable GITHUB_REPOSITORY_OWNER not found" >&2
+  exit 1
+}
+[ -n "$GITHUB_REPOSITORY" ] || {
+  echo "Required environment variable GITHUB_REPOSITORY not found" >&2
+  exit 1
+}
+[ -n "$GITHUB_REF_NAME" ] || {
+  echo "Required environment variable GITHUB_REF_NAME not found" >&2
+  exit 1
+}
+[ -n "$GITHUB_EVENT_PATH" ] || {
+  echo "Required environment variable GITHUB_EVENT_PATH not found" >&2
+  exit 1
+}
+
+owner=$GITHUB_REPOSITORY_OWNER
+repo=$(echo "$GITHUB_REPOSITORY" | cut -d/ -f2)
+label="lts-watch-$GITHUB_REF_NAME"
+
+# Lazy-get label node_id once
+label_id=
+fetch_label_id () {
+  # shellcheck disable=SC2016
+  label_id="$(gh api graphql -f query='
+    query($owner:String!, $repo:String!, $name:String!) {
+      repository(owner:$owner, name:$repo) {
+        label(name:$name) { id }
+      }
+    }' -f owner="$owner" -f repo="$repo" -f name="$label" --jq '.data.repository.label.id')"
+
+  if [ -z "$label_id" ] || [ "$label_id" = "null" ]; then
+    echo "Could not resolve label id for '$label' in $owner/$repo" >&2
+    exit 1
+  fi
+}
+
+jq --raw-output0 '.commits[].message' < "$GITHUB_EVENT_PATH" \
+| while IFS= read -r -d '' msg; do
+  pr_url=$(echo "$msg" | git interpret-trailers --parse | awk -F': ' '$1 == "PR-URL" { print $2; exit }')
+  pr_number=${pr_url##"$GITHUB_SERVER_URL/$GITHUB_REPOSITORY/pull/"}
+
+  # Filter out pr_number that are not numbers (e.g. if PR-URL points to a different repo)
+  case "$pr_number" in
+    ''|*[!0-9]*) continue ;;
+    *) ;;
+  esac
+
+  # shellcheck disable=SC2016
+  pr_id="$(LTS_WATCH_LABEL="$label" gh api graphql -f query='
+    query($owner:String!, $repo:String!, $number:Int!) {
+      repository(owner:$owner, name:$repo) {
+        pullRequest(number:$number) {
+          id
+          labels(first: 100) { nodes { name } }
+        }
+      }
+    }' -f owner="$owner" -f repo="$repo" -F number="$pr_number" \
+    --jq 'if (.data.repository.pullRequest.labels.nodes | any(.name == env.LTS_WATCH_LABEL)) then .data.repository.pullRequest.id else null end')"
+
+  # Skip PRs that do not have the label
+  [ -n "$pr_id" ] || continue
+
+  # Lazy-load the label ID if not done already
+  [ -n "$label_id" ] || fetch_label_id
+
+  # shellcheck disable=SC2016
+  gh api graphql -f query='
+    mutation($labelableId:ID!, $labelId:ID!) {
+      removeLabelsFromLabelable(input:{labelableId:$labelableId, labelIds:[$labelId]}) {
+        clientMutationId
+      }
+    }' -f labelableId="$pr_id" -f labelId="$label_id"
+
+  # gentle throttle
+  sleep 0.2
+done