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• [FILE] hermes-utils.js
• [FILE] prepare-hermes-for-build.js

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/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow strict-local
 * @format
 */

'use strict';

const {execSync, spawnSync} = require('child_process');
const fs = require('fs');
const os = require('os');
const path = require('path');

/*::
type BuildType = 'dry-run' | 'release' | 'nightly';
*/

const SDKS_DIR = path.normalize(path.join(__dirname, '..', '..', 'sdks'));
const HERMES_DIR = path.join(SDKS_DIR, 'hermes');
const HERMES_TAG_FILE_PATH = path.join(SDKS_DIR, '.hermesversion');
const HERMES_SOURCE_TARBALL_BASE_URL =
  'https://github.com/facebook/hermes/tarball/';
const HERMES_TARBALL_DOWNLOAD_DIR = path.join(SDKS_DIR, 'download');
const MACOS_BIN_DIR = path.join(SDKS_DIR, 'hermesc', 'osx-bin');
const MACOS_HERMESC_PATH = path.join(MACOS_BIN_DIR, 'hermesc');
const MACOS_IMPORT_HERMESC_PATH = path.join(
  MACOS_BIN_DIR,
  'ImportHermesc.cmake',
);

/**
 * Delegate execution to the supplied command.
 *
 * @param command Path to the command.
 * @param args Array of arguments pass to the command.
 * @param options child process options.
 */
function delegateSync(
  command /*: string */,
  args /*: (Array<string> | child_process$spawnSyncOpts) */,
  options /*: ?child_process$spawnSyncOpts */,
) {
  return spawnSync(command, args, {stdio: 'inherit', ...options});
}

function readHermesTag() /*: string */ {
  if (fs.existsSync(HERMES_TAG_FILE_PATH)) {
    const data = fs
      .readFileSync(HERMES_TAG_FILE_PATH, {
        encoding: 'utf8',
        flag: 'r',
      })
      .trim();

    if (data.length > 0) {
      return data;
    } else {
      throw new Error('[Hermes] .hermesversion file is empty.');
    }
  }

  return 'main';
}

function setHermesTag(hermesTag /*: string */) {
  if (readHermesTag() === hermesTag) {
    // No need to update.
    return;
  }

  if (!fs.existsSync(SDKS_DIR)) {
    fs.mkdirSync(SDKS_DIR, {recursive: true});
  }
  fs.writeFileSync(HERMES_TAG_FILE_PATH, hermesTag.trim());
  console.log('Hermes tag has been updated. Please commit your changes.');
}

function getHermesTagSHA(hermesTag /*: string */) /*: string */ {
  return execSync(
    `git ls-remote https://github.com/facebook/hermes ${hermesTag} | cut -f 1`,
  )
    .toString()
    .trim();
}

function getHermesTarballDownloadPath(hermesTag /*: string */) /*: string */ {
  const hermesTagSHA = getHermesTagSHA(hermesTag);
  return path.join(HERMES_TARBALL_DOWNLOAD_DIR, `hermes-${hermesTagSHA}.tgz`);
}

function downloadHermesSourceTarball() {
  const hermesTag = readHermesTag();
  const hermesTagSHA = getHermesTagSHA(hermesTag);
  const hermesTarballDownloadPath = getHermesTarballDownloadPath(hermesTag);
  let hermesTarballUrl = HERMES_SOURCE_TARBALL_BASE_URL + hermesTag;

  if (fs.existsSync(hermesTarballDownloadPath)) {
    return;
  }

  if (!fs.existsSync(HERMES_TARBALL_DOWNLOAD_DIR)) {
    fs.mkdirSync(HERMES_TARBALL_DOWNLOAD_DIR, {recursive: true});
  }

  console.info(
    `[Hermes] Downloading Hermes source code for commit ${hermesTagSHA}`,
  );
  try {
    delegateSync('curl', [hermesTarballUrl, '-Lo', hermesTarballDownloadPath]);
  } catch (error) {
    throw new Error(`[Hermes] Failed to download Hermes tarball. ${error}`);
  }
}

function expandHermesSourceTarball() {
  const hermesTag = readHermesTag();
  const hermesTagSHA = getHermesTagSHA(hermesTag);
  const hermesTarballDownloadPath = getHermesTarballDownloadPath(hermesTag);

  if (!fs.existsSync(hermesTarballDownloadPath)) {
    throw new Error('[Hermes] Could not locate Hermes tarball.');
  }

  if (!fs.existsSync(HERMES_DIR)) {
    fs.mkdirSync(HERMES_DIR, {recursive: true});
  }
  console.info(`[Hermes] Expanding Hermes tarball for commit ${hermesTagSHA}`);
  try {
    delegateSync('tar', [
      '-zxf',
      hermesTarballDownloadPath,
      '--strip-components=1',
      '--directory',
      HERMES_DIR,
    ]);
  } catch (error) {
    throw new Error('[Hermes] Failed to expand Hermes tarball.');
  }
}

function copyBuildScripts() {
  if (!fs.existsSync(SDKS_DIR)) {
    throw new Error(
      '[Hermes] Failed to copy Hermes build scripts, no SDKs directory found.',
    );
  }

  if (!fs.existsSync(HERMES_DIR)) {
    fs.mkdirSync(path.join(HERMES_DIR, 'utils'), {recursive: true});
  }

  fs.copyFileSync(
    path.join(SDKS_DIR, 'hermes-engine', 'utils', 'build-apple-framework.sh'),
    path.join(HERMES_DIR, 'utils', 'build-apple-framework.sh'),
  );
  fs.copyFileSync(
    path.join(SDKS_DIR, 'hermes-engine', 'utils', 'build-ios-framework.sh'),
    path.join(HERMES_DIR, 'utils', 'build-ios-framework.sh'),
  );
  fs.copyFileSync(
    path.join(SDKS_DIR, 'hermes-engine', 'utils', 'build-mac-framework.sh'),
    path.join(HERMES_DIR, 'utils', 'build-mac-framework.sh'),
  );
}

function copyPodSpec() {
  if (!fs.existsSync(SDKS_DIR)) {
    throw new Error(
      '[Hermes] Failed to copy Hermes Podspec, no SDKs directory found.',
    );
  }

  if (!fs.existsSync(HERMES_DIR)) {
    fs.mkdirSync(HERMES_DIR, {recursive: true});
  }
  const podspec = 'hermes-engine.podspec';
  fs.copyFileSync(
    path.join(SDKS_DIR, 'hermes-engine', podspec),
    path.join(HERMES_DIR, podspec),
  );
  const utils = 'hermes-utils.rb';
  fs.copyFileSync(
    path.join(SDKS_DIR, 'hermes-engine', utils),
    path.join(HERMES_DIR, utils),
  );
}

function isTestingAgainstLocalHermesTarball() {
  return 'HERMES_ENGINE_TARBALL_PATH' in process.env;
}

function shouldBuildHermesFromSource(isInCI /*: boolean */) /*: boolean */ {
  return !isTestingAgainstLocalHermesTarball() && isInCI;
}

function shouldUsePrebuiltHermesC(
  platform /*: 'macos' | 'windows' */,
) /*: boolean */ {
  if (platform === 'macos') {
    return fs.existsSync(MACOS_HERMESC_PATH);
  }

  return false;
}

function configureMakeForPrebuiltHermesC() {
  const IMPORT_HERMESC_TEMPLATE = `add_executable(native-hermesc IMPORTED)
set_target_properties(native-hermesc PROPERTIES
  IMPORTED_LOCATION "${MACOS_HERMESC_PATH}"
  )`;

  try {
    fs.mkdirSync(MACOS_BIN_DIR, {recursive: true});
    fs.writeFileSync(MACOS_IMPORT_HERMESC_PATH, IMPORT_HERMESC_TEMPLATE);
  } catch (error) {
    console.warn(
      `[Hermes] Re-compiling hermesc. Unable to configure make: ${error}`,
    );
  }
}

function getHermesPrebuiltArtifactsTarballName(
  buildType /*:: ?: string */,
) /*: string */ {
  if (buildType == null) {
    throw Error('Did not specify build type.');
  }
  return `hermes-ios-${buildType.toLowerCase()}.tar.gz`;
}

/**
 * Creates a tarball with the contents of the supplied directory.
 */
function createTarballFromDirectory(
  directory /*: string */,
  filename /*: string */,
) {
  const args = ['-C', directory, '-czvf', filename, '.'];
  delegateSync('tar', args);
}

function createHermesPrebuiltArtifactsTarball(
  hermesDir /*: string */,
  buildType /*: string */,
  tarballOutputDir /*: string */,
  excludeDebugSymbols /*: boolean */,
) /*: string */ {
  validateHermesFrameworksExist(path.join(hermesDir, 'destroot'));

  if (!fs.existsSync(tarballOutputDir)) {
    fs.mkdirSync(tarballOutputDir, {recursive: true});
  }

  let tarballTempDir;
  try {
    tarballTempDir = fs.mkdtempSync(
      path.join(os.tmpdir(), 'hermes-engine-destroot-'),
    );

    let args = ['-a'];
    if (excludeDebugSymbols) {
      args.push('--exclude=dSYMs/');
      args.push('--exclude=*.dSYM/');
    }
    args.push('./destroot');
    args.push(tarballTempDir);
    delegateSync('rsync', args, {
      cwd: hermesDir,
    });
    if (fs.existsSync(path.join(hermesDir, 'LICENSE'))) {
      delegateSync('cp', ['LICENSE', tarballTempDir], {cwd: hermesDir});
    }
  } catch (error) {
    throw new Error(`Failed to copy destroot to tempdir: ${error}`);
  }

  const tarballFilename = path.join(
    tarballOutputDir,
    getHermesPrebuiltArtifactsTarballName(buildType),
  );

  try {
    createTarballFromDirectory(tarballTempDir, tarballFilename);
  } catch (error) {
    throw new Error(`[Hermes] Failed to create tarball: ${error}`);
  }

  if (!fs.existsSync(tarballFilename)) {
    throw new Error(
      `Tarball creation failed, could not locate tarball at ${tarballFilename}`,
    );
  }

  return tarballFilename;
}

function validateHermesFrameworksExist(destrootDir /*: string */) {
  if (
    !fs.existsSync(
      path.join(destrootDir, 'Library/Frameworks/macosx/hermes.framework'),
    )
  ) {
    throw new Error(
      'Error: Hermes macOS Framework not found. Are you sure Hermes has been built?',
    );
  }
  if (
    !fs.existsSync(
      path.join(destrootDir, 'Library/Frameworks/universal/hermes.xcframework'),
    )
  ) {
    throw new Error(
      'Error: Hermes iOS XCFramework not found. Are you sure Hermes has been built?',
    );
  }
}

module.exports = {
  configureMakeForPrebuiltHermesC,
  copyBuildScripts,
  copyPodSpec,
  createHermesPrebuiltArtifactsTarball,
  createTarballFromDirectory,
  downloadHermesSourceTarball,
  expandHermesSourceTarball,
  getHermesTagSHA,
  getHermesTarballDownloadPath,
  getHermesPrebuiltArtifactsTarballName,
  readHermesTag,
  setHermesTag,
  shouldBuildHermesFromSource,
  shouldUsePrebuiltHermesC,
};

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