src/Composer/Repository/Vcs/GitDriver.php
public function getFileContent($file, $identifier)
    {
        $resource = sprintf('%s:%s', ProcessExecutor::escape($identifier), ProcessExecutor::escape($file));
        $this->process->execute(sprintf('git show %s', $resource), $content, $this->repoDir);

        if (!trim($content)) {
            return null;
        }

        return $content;
    }
public function getFileContent($file, $identifier)
    {
        $resource = sprintf('%s:%s', ProcessExecutor::escape($identifier), ProcessExecutor::escape($file));
        $this->process->execute(sprintf('git show %s', $resource), $content, $this->repoDir);

        if (!trim($content)) {
            return null;
        }

        return $content;
    }
{@inheritdoc}