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<?php |
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namespace Consolidation\Cgr; |
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/** |
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* Determine information about the system |
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*/ |
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class SystemInformation |
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{ |
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/** |
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* @throws \RuntimeException |
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* @return string |
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*/ |
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public static function getHomeDir() |
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{ |
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$home = getenv('COMPOSER_HOME'); |
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if ($home) { |
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return $home; |
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} |
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if (self::isWindows()) { |
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if (!getenv('APPDATA')) { |
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throw new \RuntimeException('The APPDATA or COMPOSER_HOME environment variable must be set for composer to run correctly'); |
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} |
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return rtrim(strtr(getenv('APPDATA'), '\\', '/'), '/') . '/Composer'; |
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} |
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$userDir = self::getUserDir(); |
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if (is_dir($userDir . '/.composer')) { |
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return $userDir . '/.composer'; |
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} |
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if (self::useXdg()) { |
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// XDG Base Directory Specifications |
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$xdgConfig = getenv('XDG_CONFIG_HOME') ?: $userDir . '/.config'; |
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return $xdgConfig . '/composer'; |
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} |
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return $userDir . '/.composer'; |
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} |
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/** |
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* @return bool Whether the host machine is running a Windows OS |
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*/ |
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public static function isWindows() |
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{ |
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return defined('PHP_WINDOWS_VERSION_BUILD'); |
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} |
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/** |
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* @return bool |
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*/ |
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private static function useXdg() |
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{ |
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foreach (array_keys($_SERVER) as $key) { |
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if (substr($key, 0, 4) === 'XDG_') { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* @throws \RuntimeException |
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* @return string |
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*/ |
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private static function getUserDir() |
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{ |
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$home = getenv('HOME'); |
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if (!$home) { |
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throw new \RuntimeException('The HOME or COMPOSER_HOME environment variable must be set for composer to run correctly'); |
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} |
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return rtrim(strtr($home, '\\', '/'), '/'); |
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} |
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} |
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Instead of super-globals, we recommend to explicitly inject the dependencies of your class. This makes your code less dependent on global state and it becomes generally more testable: