🏗 Update CircleCI hash for .karma-cache (#32312)

.circleci/config.yml

@@ -38,17 +38,20 @@ commands:
     steps:
       - save_cache:
           name: 'Save Karma Cache'
-          key: karma-cache-<<parameters.cache_name>>-{{ checksum "package-lock.json" }}
+          key: karma-cache-<<parameters.cache_name>>-{{ checksum ".karma-cache-hash" }}
           paths:
             - .karma-cache
   restore_karma_cache:
     parameters:
       cache_name:
         type: string
     steps:
+      - run:
+          name: 'Compute Karma Cache Hash'
+          command: node ./build-system/common/compute-karma-cache-hash.js
       - restore_cache:
           name: 'Restore Karma Cache'
-          key: karma-cache-<<parameters.cache_name>>-{{ checksum "package-lock.json" }}
+          key: karma-cache-<<parameters.cache_name>>-{{ checksum ".karma-cache-hash" }}
   setup_vm:
     steps:
       - checkout

.gitignore

@@ -1,7 +1,7 @@
 .DS_Store
 .g4ignore
 build/
-.karma-cache
+.karma-cache*
 .amp-build
 c
 /dist

build-system/common/browserify-cache.js

@@ -21,14 +21,12 @@ const globby = require('globby');
 const {dotWrappingWidth} = require('./logging');
 
 /**
- * Used for persistent babel caching during tests. Created using a hash object
- * that includes the repo package lockfile and various parts of the build-system
- * so that the cache is invalidated if any of them changes, and files are
- * retransformed.
- * @return {function}
+ * The hash object includes the repo package lockfile and various parts of the
+ * build-system so that the cache is invalidated if any of them changes, and
+ * files are retransformed.
+ * @return {!Object}
  */
-function getPersistentBrowserifyCache() {
-  let wrapCounter = 0;
+function getHashObject() {
   const createHash = (input) =>
     crypto.createHash('sha1').update(input).digest('hex');
   const hashObject = {
@@ -41,14 +39,23 @@ function getPersistentBrowserifyCache() {
       ])
       .map((f) => createHash(fs.readFileSync(f))),
   };
+  return hashObject;
+}
+
+/**
+ * Used for persistent babel caching during tests.
+ * @return {function}
+ */
+function getPersistentBrowserifyCache() {
+  let wrapCounter = 0;
   const logger = () => {
     process.stdout.write('.');
     if (++wrapCounter >= dotWrappingWidth) {
       wrapCounter = 0;
       process.stdout.write('\n');
     }
   };
-  const cache = browserifyPersistFs('.karma-cache', hashObject, logger);
+  const cache = browserifyPersistFs('.karma-cache', getHashObject(), logger);
   cache.gc(
     {maxAge: 1000 * 60 * 60 * 24 * 7}, // Refresh cache if more than a week old
     () => {} // swallow errors
@@ -57,5 +64,6 @@ function getPersistentBrowserifyCache() {
 }
 
 module.exports = {
+  getHashObject,
   getPersistentBrowserifyCache,
 };

build-system/common/compute-karma-cache-hash.js

@@ -0,0 +1,30 @@
+#!/usr/bin/env node
+/**
+ * Copyright 2021 The AMP HTML Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS-IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+const fs = require('fs-extra');
+const {getHashObject} = require('./browserify-cache');
+
+/**
+ * Writes the browserify hashObject representing all the test files we care
+ * about to a file. Used during CI to determine when to refresh .karma-cache.
+ */
+function main() {
+  const hashObject = getHashObject();
+  fs.writeJSONSync('.karma-cache-hash', hashObject, {spaces: 2});
+}
+
+main();

build-system/tasks/clean.js

@@ -29,7 +29,7 @@ const ROOT_DIR = path.resolve(__dirname, '../../');
 async function clean() {
   const pathsToDelete = [
     '.amp-build',
-    '.karma-cache',
+    '.karma-cache*',
     'build',
     'build-system/server/new-server/transforms/dist',
     'deps.txt',