dependabot adds e2e label and action to add changesets to dependabot PRs

.github/dependabot.yml

@@ -14,3 +14,6 @@ updates:
       interval: 'weekly'
     # Update package.json files if new version is outside of version range specified there. Otherwise lock file only.
     versioning-strategy: increase-if-necessary
+    labels:
+      - 'dependency'
+      - 'run-e2e'

.github/workflows/health_checks.yml

@@ -809,3 +809,24 @@ jobs:
         uses: actions/dependency-review-action@0c155c5e8556a497adf53f2c18edabf945ed8e70 # version 4.3.2
         with:
           config-file: ./.github/dependency_review_config.yml
+  generate_changeset:
+    if: github.event_name == 'pull_request' && github.event.pull_request.user.login == 'dependabot[bot]'
+    runs_on: ubuntu-latest
+    needs:
+      - install
+      - resolve_inputs
+    steps:
+      - uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # version 4.1.4
+        fetch-depth: 0
+      - uses: ./.github/actions/setup_node
+        with:
+          node-version: 18
+      - uses: ./.github/actions/restore_install_cache
+        with:
+          node-version: 18
+          cdk-version: ${{ needs.resolve_inputs.outputs.cdk_version }}
+      - name: Generate changesets for packages with version updates
+        run: npx tsx scripts/dependabot_generate_changesets.ts "$BASE_SHA" "$HEAD_SHA"
+        env:
+          BASE_SHA: ${{ github.event.pull_request.base.sha }}
+          HEAD_SHA: ${{ github.event.pull_request.head.sha }}

scripts/components/git_client.ts

@@ -65,6 +65,14 @@ export class GitClient {
     return filenameDiffOutput.toString().split(EOL);
   };
 
+  /**
+   * Get changes made in a specific modified file from getChangedFiles
+   */
+  getFileChanges = async (file: string) => {
+    const { stdout: changes } = await this.exec`git show ${file}`;
+    return changes;
+  };
+
   /**
    * Switches to branchName. Creates the branch if it does not exist.
    */

scripts/dependabot_generate_changesets.ts

@@ -0,0 +1,93 @@
+import fsp from 'fs/promises';
+import { EOL } from 'os';
+import { GitClient } from './components/git_client.js';
+import { readPackageJson } from './components/package-json/package_json.js';
+
+const createChangesetFile = async (
+  versionUpdates: Map<string, string>,
+  packageNames: string[]
+) => {
+  let message = '';
+
+  for (const [dep, version] of versionUpdates) {
+    message += `Update dependency ${dep} to ${version}.${EOL}`;
+  }
+
+  const frontmatterContent = packageNames
+    .map((name) => `'${name}': patch`)
+    .join(EOL);
+  const body = `---${EOL}${frontmatterContent}${EOL}---${EOL}${EOL}${message.trim()}${EOL}`;
+  await fsp.writeFile(fileName, body);
+};
+
+const getVersionUpdates = async (files: string[]) => {
+  const updates = new Map<string, string>();
+  for (const file of files) {
+    const changes = await gitClient.getFileChanges(file);
+    for (const change of changes.split(EOL)) {
+      if (!change.startsWith('+ ')) {
+        continue;
+      }
+      // This will capture lines in git diff like:
+      // +  "<dependency>": "^<version>"
+      const match = change.match(/"(.*)": "(.*)"/);
+
+      if (!match) {
+        continue;
+      }
+      // Add dependency name (match[1]) and new version (match[2]) to Map
+      updates.set(match[1].replace(/"/g, ''), match[2].replace(/"/g, ''));
+    }
+  }
+
+  return updates;
+};
+
+const gitClient = new GitClient();
+
+const branch = await gitClient.getCurrentBranch();
+if (!branch.startsWith('dependabot/')) {
+  // if branch is not a dependabot branch, return early
+  process.exit();
+}
+
+const baseRef = process.argv[2];
+if (baseRef === undefined) {
+  throw new Error('No base ref specified for generate changeset check');
+}
+
+const headRef = process.argv[3].trim();
+if (headRef === undefined) {
+  throw new Error('No head ref specified for generate changeset check');
+}
+
+const changedFiles = await gitClient.getChangedFiles(baseRef);
+const modifiedPackageDirs = new Set<string>();
+
+// Get modified package.json files that we care about for changesets
+const packageJsonFiles = changedFiles.filter(
+  (changedFile) =>
+    changedFile.startsWith('packages/') &&
+    !['packages/integration-tests', 'packages/eslint-rules'].some(
+      (packageName) => changedFile.startsWith(packageName)
+    ) &&
+    changedFile.endsWith('package.json')
+);
+
+packageJsonFiles.forEach((changedPackageFile) => {
+  modifiedPackageDirs.add(changedPackageFile.split('/').slice(0, 2).join('/'));
+});
+
+const packageNames = [];
+for (const modifiedPackageDir of modifiedPackageDirs) {
+  const { name: modifiedPackageName } = await readPackageJson(
+    modifiedPackageDir
+  );
+  packageNames.push(modifiedPackageName);
+}
+
+const fileName = `.changeset/dependabot-${headRef}.md`;
+const versionUpdates = await getVersionUpdates(packageJsonFiles);
+await createChangesetFile(versionUpdates, packageNames);
+await gitClient.commitAllChanges('add changeset');
+await gitClient.push({ force: true });