使用 Homestead 安装 Composer 时出现错误“您的要求无法解析为可安装的软件包集”

Question

我正在尝试使用以下命令安装我的作曲家包：

composer install --no-dev --no-scripts

composer.json 文件看起来像这样（它与标准的 Laravel 作曲家文件非常相似）：

{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "type": "project",
    "require": {
        "php": ">=5.5.9",
        "laravel/framework": "5.2.*",
        "doctrine/dbal": "^2.5",
    },
    "require-dev": {
        "fzaninotto/faker": "~1.4",
        "mockery/mockery": "0.9.*",
        "phpunit/phpunit": "~4.0",
        "symfony/css-selector": "2.8.*|3.0.*",
        "symfony/dom-crawler": "2.8.*|3.0.*",
        "laravel/homestead": "^5.2",
        "barryvdh/laravel-ide-helper": "^2.3"
    },
    "autoload": {
        "classmap": [
            "database"
        ],
        "psr-4": {
            "App\\": "app/"
        }
    },
    "autoload-dev": {
        "classmap": [
            "tests/TestCase.php"
        ]
    },
    "scripts": {
        "post-root-package-install": [
            "php -r \"copy('.env.example', '.env');\""
        ],
        "post-create-project-cmd": [
            "php artisan key:generate"
        ],
        "post-install-cmd": [
            "Illuminate\\Foundation\\ComposerScripts::postInstall",
            "php artisan optimize"
        ],
        "post-update-cmd": [
            "Illuminate\\Foundation\\ComposerScripts::postUpdate",
            "php artisan optimize"
        ]
    },
    "config": {
        "preferred-install": "dist"
    }
}

但是，当我尝试将它安装在我的生产机器上（运行 PHP 版本 v5.5.9 时，我收到以下错误：

您的需求无法解析为一组可安装的软件包。

  Problem 1
    - laravel/homestead v5.4.0 requires php ^5.6 || ^7.0 -> your PHP version (5.5.9) does not satisfy that requirement.
    - laravel/homestead v5.3.2 requires php ^5.6 || ^7.0 -> your PHP version (5.5.9) does not satisfy that requirement.
    - laravel/homestead v5.3.1 requires php ^5.6 || ^7.0 -> your PHP version (5.5.9) does not satisfy that requirement.
    - laravel/homestead v5.3.0 requires php ^5.6 || ^7.0 -> your PHP version (5.5.9) does not satisfy that requirement.
    - laravel/homestead v5.2.4 requires php ^5.6 || ^7.0 -> your PHP version (5.5.9) does not satisfy that requirement.
    - laravel/homestead v5.2.1 requires php ^5.6 || ^7.0 -> your PHP version (5.5.9) does not satisfy that requirement.
    - laravel/homestead v5.2.0 requires php ^5.6 || ^7.0 -> your PHP version (5.5.9) does not satisfy that requirement.
    - laravel/homestead 5.2.3 requires php ^5.6 || ^7.0 -> your PHP version (5.5.9) does not satisfy that requirement.
    - laravel/homestead 5.2.2 requires php ^5.6 || ^7.0 -> your PHP version (5.5.9) does not satisfy that requirement.
    - Installation request for laravel/homestead ^5.2 -> satisfiable by laravel/homestead[5.2.2, 5.2.3, v5.2.0, v5.2.1, v5.2.4, v5.3.0, v5.3.1, v5.3.2, v5.4.0].

所以我的问题如下：

• 当我说--no-dev 并且 homestead 是一个开发包时，为什么还要安装 homestead？
• 如果我确实想在我的生产机器上安装 Homestead，我该如何解决上述问题？

Answer 1

--no-dev 不应安装开发依赖项。检查您的生产构建脚本（或您用于在生产中运行它的任何内容），确实添加了 --no-dev。

对于您问题的第二部分，您可以通过将laravel/homestead 包版本更改为~4.0 或4.0.5 来避免错误，以使其与您的php版本兼容。