public static function ScriptHandler::checkComposerVersion in Varbase: The Ultimate Drupal CMS Starter Kit (Bootstrap Ready) 8.5

Same name and namespace in other branches

1. 8.8 src/composer/ScriptHandler.php \Varbase\composer\ScriptHandler::checkComposerVersion()
2. 8.4 src/composer/ScriptHandler.php \Varbase\composer\ScriptHandler::checkComposerVersion()
3. 8.6 src/composer/ScriptHandler.php \Varbase\composer\ScriptHandler::checkComposerVersion()
4. 8.7 src/composer/ScriptHandler.php \Varbase\composer\ScriptHandler::checkComposerVersion()
5. 9.0.x src/composer/ScriptHandler.php \Varbase\composer\ScriptHandler::checkComposerVersion()

Checks if the installed version of Composer is compatible.

Composer 1.0.0 and higher consider a `composer install` without having a lock file present as equal to `composer update`. We do not ship with a lock file to avoid merge conflicts downstream, meaning that if a project is installed with an older version of Composer the scaffolding of Drupal will not be triggered. We check this here instead of in drupal-scaffold to be able to give immediate feedback to the end user, rather than failing the installation after going through the lengthy process of compiling and downloading the Composer dependencies.

See also

https://github.com/composer/composer/pull/5035

File

src/composer/ScriptHandler.php, line 87

Class

ScriptHandler

Varbase Composer Script Handler.

Namespace

Varbase\composer

Code

public static function checkComposerVersion(Event $event) {
  $composer = $event
    ->getComposer();
  $io = $event
    ->getIO();
  $version = $composer::VERSION;

  // The dev-channel of composer uses the git revision as version number,
  // try to the branch alias instead.
  if (preg_match('/^[0-9a-f]{40}$/i', $version)) {
    $version = $composer::BRANCH_ALIAS_VERSION;
  }

  // If Composer is installed through git we have no easy way to determine if
  // it is new enough, just display a warning.
  if ($version === '@package_version@' || $version === '@package_branch_alias_version@') {
    $io
      ->writeError('<warning>You are running a development version of Composer. If you experience problems, please update Composer to the latest stable version.</warning>');
  }
  elseif (Comparator::lessThan($version, '1.0.0')) {
    $io
      ->writeError('<error>Drupal-project requires Composer version 1.0.0 or higher. Please update your Composer before continuing</error>.');
    exit(1);
  }
}