install-composer.php

#!/usr/bin/env php
<?php

/*
 * This file is part of Composer.
 *
 * (c) Nils Adermann <naderman@naderman.de>
 *     Jordi Boggiano <j.boggiano@seld.be>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

process($argv);

/**
 * processes the installer
 */
function process($argv)
{
    $options = array('help::', 'check::', 'force::', 'install-dir::');
    $getopts = getopt(null, $options);

    $check      = isset($getopts['check']);
    $help       = isset($getopts['help']);
    $force      = isset($getopts['force']);
    $installDir = isset($getopts['install-dir']) ? $getopts['install-dir'] : false;

    if ($help) {
        displayHelp();
        exit(0);
    }

    $ok = checkPlatform();

    if ($check) {
        exit($ok ? 0 : 1);
    }

    if ($ok || $force) {
        installComposer($installDir);
    }

    exit(0);
}

/**
 * displays the help
 */
function displayHelp()
{
    echo <<<EOF
Composer Installer
------------------
Options
--help        this help
--check       for checking environment only
--force       forces the installation
--install-dir accepts a target installation directory

EOF;
}

/**
 * check the platform for possible issues on running composer
 */
function checkPlatform()
{
    $errors = array();
    if (ini_get('detect_unicode')) {
        $errors['unicode'] = 'On';
    }

    $suhosin = ini_get('suhosin.executor.include.whitelist');
    if (false !== $suhosin && false === stripos($suhosin, 'phar')) {
        $errors['suhosin'] = $suhosin;
    }

    if (!ini_get('allow_url_fopen')) {
        $errors['allow_url_fopen'] = true;
    }

    if (extension_loaded('ionCube Loader')) {
        $errors['ioncube'] = true;
    }

    if (version_compare(PHP_VERSION, '5.3.2', '<')) {
        $errors['php'] = PHP_VERSION;
    }

    if (!empty($errors)) {
        out("Some settings on your machine make Composer unable to work properly.".PHP_EOL, 'error');

        out('Make sure that you fix the issues listed below and run this script again:'.PHP_EOL, 'error');
        foreach ($errors as $error => $current) {
            switch ($error) {
                case 'unicode':
                    $text = PHP_EOL."The detect_unicode setting must be disabled.".PHP_EOL;
                    $text .= "Add the following to the end of your `php.ini`:".PHP_EOL;
                    $text .= "    detect_unicode = Off".PHP_EOL;
                    break;

                case 'suhosin':
                    $text = PHP_EOL."The suhosin.executor.include.whitelist setting is incorrect.".PHP_EOL;
                    $text .= "Add the following to the end of your `php.ini`:".PHP_EOL;
                    $text .= "    suhosin.executor.include.whitelist = phar ".$current.PHP_EOL;
                    break;

                case 'php':
                    $text = PHP_EOL."Your PHP ({$current}) is too old, you must upgrade to PHP 5.3.2 or higher.".PHP_EOL;
                    break;

                case 'allow_url_fopen':
                    $text = PHP_EOL."The allow_url_fopen setting is incorrect.".PHP_EOL;
                    $text .= "Add the following to the end of your `php.ini`:".PHP_EOL;
                    $text .= "    allow_url_fopen = On".PHP_EOL;
                    break;

                case 'ioncube':
                    $text = PHP_EOL."The ionCube Loader extension is incompatible with Phar files.".PHP_EOL;
                    $text .= "Remove this line (path may be different) from your `php.ini`:".PHP_EOL;
                    $text .= "    zend_extension = /usr/lib/php5/20090626+lfs/ioncube_loader_lin_5.3.so".PHP_EOL;
                    break;
            }
            out($text, 'info');
        }
        echo PHP_EOL;
        return false;
    }

    out("All settings correct for using Composer".PHP_EOL, 'success');
    return true;
}

/**
 * installs composer to the current working directory
 */
function installComposer($installDir)
{
    $installDir = realpath($installDir) ?: getcwd();
    $file       = $installDir.DIRECTORY_SEPARATOR.'composer.phar';

    if (is_readable($file)) {
        @unlink($file);
    }

    $download = copy('http://getcomposer.org/composer.phar', $file);

    out(PHP_EOL."Composer successfully installed to: " . $file, 'success');
    out(PHP_EOL."Use it: php composer.phar".PHP_EOL, 'info');
}

/**
 * colorize output
 */
function out($text, $color = null)
{
    $styles = array(
        'success' => "\033[0;32m%s\033[0m",
        'error' => "\033[31;31m%s\033[0m",
        'info' => "\033[33;33m%s\033[0m"
    );

    echo sprintf(isset($styles[$color]) ? $styles[$color] : "%s", $text);
}