build: add parallel script to build using bazel

(cherry picked from commit ddec41e)

package.json

@@ -22,6 +22,7 @@
     "admin": "node ./bin/devkit-admin",
     "bazel:test": "bazel test //packages/...",
     "build": "node ./bin/devkit-admin build",
+    "build:bazel": "node ./bin/devkit-admin build-bazel",
     "build-tsc": "tsc -p tsconfig.json",
     "lint": "eslint --cache --max-warnings=0 \"**/*.ts\"",
     "templates": "node ./bin/devkit-admin templates",

scripts/build-bazel.ts

@@ -0,0 +1,180 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import { logging } from '@angular-devkit/core';
+import { spawn } from 'child_process';
+import fs from 'fs';
+import { dirname, join, relative, resolve } from 'path';
+
+const baseDir = resolve(`${__dirname}/..`);
+const bazelCmd = process.env.BAZEL ?? `yarn --cwd "${baseDir}" --silent bazel`;
+const distRoot = join(baseDir, '/dist');
+
+type BuildMode = 'local' | 'snapshot' | 'release';
+
+function _copy(from: string, to: string) {
+  // Create parent folder if necessary.
+  if (!fs.existsSync(dirname(to))) {
+    fs.mkdirSync(dirname(to), { recursive: true });
+  }
+
+  // Error out if destination already exists.
+  if (fs.existsSync(to)) {
+    throw new Error(`Path ${to} already exist...`);
+  }
+
+  from = relative(process.cwd(), from);
+  to = relative(process.cwd(), to);
+
+  const buffer = fs.readFileSync(from);
+  fs.writeFileSync(to, buffer);
+}
+
+function _recursiveCopy(from: string, to: string, logger: logging.Logger) {
+  if (!fs.existsSync(from)) {
+    logger.error(`File "${from}" does not exist.`);
+    process.exit(4);
+  }
+  if (fs.statSync(from).isDirectory()) {
+    fs.readdirSync(from).forEach((fileName) => {
+      _recursiveCopy(join(from, fileName), join(to, fileName), logger);
+    });
+  } else {
+    _copy(from, to);
+  }
+}
+
+function rimraf(location: string) {
+  // The below should be removed and replace with just `rmSync` when support for Node.Js 12 is removed.
+  const { rmSync, rmdirSync } = fs as typeof fs & {
+    rmSync?: (
+      path: fs.PathLike,
+      options?: {
+        force?: boolean;
+        maxRetries?: number;
+        recursive?: boolean;
+        retryDelay?: number;
+      },
+    ) => void;
+  };
+
+  if (rmSync) {
+    rmSync(location, { force: true, recursive: true, maxRetries: 3 });
+  } else {
+    rmdirSync(location, { recursive: true, maxRetries: 3 });
+  }
+}
+
+function _clean(logger: logging.Logger) {
+  logger.info('Cleaning...');
+  logger.info('  Removing dist/...');
+  rimraf(join(__dirname, '../dist'));
+}
+
+function _exec(cmd: string, captureStdout: boolean, logger: logging.Logger): Promise<string> {
+  return new Promise((resolve, reject) => {
+    const proc = spawn(cmd, {
+      stdio: 'pipe',
+      shell: true,
+    });
+
+    let output = '';
+    proc.stdout.on('data', (data) => {
+      logger.info(data.toString().trim());
+      if (captureStdout) {
+        output += data.toString().trim();
+      }
+    });
+    proc.stderr.on('data', (data) => logger.info(data.toString().trim()));
+
+    proc.on('error', (error) => {
+      logger.error(error.message);
+    });
+
+    proc.on('exit', (status) => {
+      if (status !== 0) {
+        reject(`Command failed: ${cmd}`);
+      } else {
+        resolve(output);
+      }
+    });
+  });
+}
+
+async function _build(logger: logging.Logger, mode: BuildMode): Promise<string[]> {
+  logger.info(`Building (mode=${mode})...`);
+
+  const queryLogger = logger.createChild('query');
+  const queryTargetsCmd = `${bazelCmd} query --output=label "attr(name, npm_package_archive, //packages/...)"`;
+  const targets = (await _exec(queryTargetsCmd, true, queryLogger)).split(/\r?\n/);
+
+  let configArg = '';
+  if (mode === 'snapshot') {
+    configArg = '--config=snapshot';
+  } else if (mode === 'release') {
+    configArg = '--config=release';
+  }
+
+  const buildLogger = logger.createChild('build');
+
+  // If we are in release mode, run `bazel clean` to ensure the execroot and action cache
+  // are not populated. This is necessary because targets using `npm_package` rely on
+  // workspace status variables for the package version. Such NPM package targets are not
+  // rebuilt if only the workspace status variables change. This could result in accidental
+  // re-use of previously built package output with a different `version` in the `package.json`.
+  if (mode == 'release') {
+    buildLogger.info('Building in release mode. Resetting the Bazel execroot and action cache..');
+    await _exec(`${bazelCmd} clean`, false, buildLogger);
+  }
+
+  await _exec(`${bazelCmd} build ${configArg} ${targets.join(' ')}`, false, buildLogger);
+
+  return targets;
+}
+
+export default async function (
+  argv: { local?: boolean; snapshot?: boolean } = {},
+  logger: logging.Logger = new logging.Logger('build-logger'),
+): Promise<{ name: string; outputPath: string }[]> {
+  const bazelBin = await _exec(`${bazelCmd} info bazel-bin`, true, logger);
+
+  _clean(logger);
+
+  let buildMode: BuildMode;
+  if (argv.local) {
+    buildMode = 'local';
+  } else if (argv.snapshot) {
+    buildMode = 'snapshot';
+  } else {
+    buildMode = 'release';
+  }
+
+  const targets = await _build(logger, buildMode);
+  const output: { name: string; outputPath: string }[] = [];
+
+  logger.info('Moving packages and tars to dist/');
+  const packageLogger = logger.createChild('packages');
+
+  for (const target of targets) {
+    const packageDir = target.replace(/\/\/packages\/(.*):npm_package_archive/, '$1');
+    const bazelOutDir = join(bazelBin, 'packages', packageDir, 'npm_package');
+    const tarPath = `${bazelBin}/packages/${packageDir}/npm_package_archive.tar.gz`;
+    const packageJsonPath = `${bazelOutDir}/package.json`;
+    const packageName = require(packageJsonPath).name;
+    const destDir = `${distRoot}/${packageName}`;
+
+    packageLogger.info(packageName);
+
+    _recursiveCopy(bazelOutDir, destDir, logger);
+    _copy(tarPath, `${distRoot}/${packageName.replace('@', '_').replace('/', '_')}.tgz`);
+
+    output.push({ name: packageDir, outputPath: destDir });
+  }
+
+  return output;
+}