Function getVersion

build-system/compile/internal-version.js:66–90

* Generates the AMP version number. * * Version numbers are determined using the following algorithm: * - Count the number ( ) of cherry-picked commits on this branch, including * commits not on the main branch . If this branch only contains new commits * that are not cherry-picked, then

(ref = 'HEAD')

 * @return {string} AMP version number (always 13 digits long)
 */
function getVersion(ref = 'HEAD') {
  if (argv.version_override) {
    const version = String(argv.version_override);
    if (!/^\d{13}$/.test(version)) {
      throw new Error('--version_override only accepts a 13-digit version');
    }
    return version;
  }

  const numberOfCherryPicks = gitCherryMain(ref).length;
  if (numberOfCherryPicks > 999) {
    throw new Error(
      `This branch has ${numberOfCherryPicks} cherry-picks, which is more ` +
        'than 999, the maximum allowed number of cherry-picks! Please make ' +
        'sure your local main branch is up to date.'
    );
  }

  const lastCommitFormattedTime = gitCommitFormattedTime(
    `${ref}~${numberOfCherryPicks}`
  ).slice(0, -2);

  const numberOfCherryPicksStr = String(numberOfCherryPicks).padStart(3, '0');
  return `${lastCommitFormattedTime}${numberOfCherryPicksStr}`;
}

// Used to e.g. references the ads binary from the runtime to get version lock.
const VERSION = getVersion();