composerのインストール後にパーミッションを変える方法 ref: http://qiita.com/polidog/items/0c747eb42474d254738d

composer.json

{
    "name": "polidog/composer-test",
    "authors": [
        {
            "name": "polidog",
            "email": "[email protected]"
        }
    ],
    "repositories": [
      {
        "type": "package",
        "package": {
          "name": "google/google-api-php-client",
          "version": "0.6.7",
          "dist": {
            "url": "http://google-api-php-client.googlecode.com/files/google-api-php-client-0.6.7.tar.gz",
            "type": "tar"
          }
        }
      }
    ],
    "require": {
      "google/google-api-php-client": "0.6.7"
    }
}

file1.txt

{
    "name": "polidog/composer-test",
    "authors": [
        {
            "name": "polidog",
            "email": "[email protected]"
        }
    ],
    "repositories": [
      {
        "type": "package",
        "package": {
          "name": "google/google-api-php-client",
          "version": "0.6.7",
          "dist": {
            "url": "http://google-api-php-client.googlecode.com/files/google-api-php-client-0.6.7.tar.gz",
            "type": "tar"
          }
        }
      }
    ],
    "require": {
      "google/google-api-php-client": "0.6.7"
    },
    "scripts": {
      "post-install-cmd": [
        "chmod -R 755 vendor/google"
      ],
      "post-update-cmd": [
        "chmod -R 755 vendor/google"
      ]
    }
}