执行composer 没有反应,请问是被墙吗?

配置文件:
{
"require": {
    "laravel/framework": "4.0.*",
    "cartalyst/sentry": "2.0.*",
    "jasonlewis/expressive-date": "1.0.*",
    "kmd/logviewer": "1.1.*"
},
"require-dev": {
    "phpunit/phpunit": "3.7.*"
},
"repositories": {
    "packagist": {
        "type": "composer",
        "url": "http://packagist.phpcomposer.com"
    }
}
}

执行:
composer install

就没有下文了!请问是被墙了吗,还是我的配置文件有问题吗?
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