387 Zeilen
13 KiB
PHP
387 Zeilen
13 KiB
PHP
<?php
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//
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// +----------------------------------------------------------------------+
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// | PHP Version 4 |
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// +----------------------------------------------------------------------+
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// | Copyright (c) 1997-2003 The PHP Group |
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// +----------------------------------------------------------------------+
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// | This source file is subject to version 3.0 of the PHP license, |
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// | that is bundled with this package in the file LICENSE, and is |
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// | available through the world-wide-web at the following url: |
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// | http://www.php.net/license/3_0.txt. |
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// | If you did not receive a copy of the PHP license and are unable to |
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// | obtain it through the world-wide-web, please send a note to |
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// | license@php.net so we can mail you a copy immediately. |
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// +----------------------------------------------------------------------+
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// | Authors: Tomas V.V.Cox <cox@idecnet.com> |
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// | Stig Bakken <ssb@php.net> |
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// +----------------------------------------------------------------------+
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//
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// $Id$
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require_once "PEAR.php";
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define('PEAR_DEPENDENCY_MISSING', -1);
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define('PEAR_DEPENDENCY_CONFLICT', -2);
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define('PEAR_DEPENDENCY_UPGRADE_MINOR', -3);
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define('PEAR_DEPENDENCY_UPGRADE_MAJOR', -4);
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define('PEAR_DEPENDENCY_BAD_DEPENDENCY', -5);
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/**
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* Dependency check for PEAR packages
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*
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* The class is based on the dependency RFC that can be found at
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* http://cvs.php.net/cvs.php/pearweb/rfc. It requires PHP >= 4.1
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*
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* @author Tomas V.V.Vox <cox@idecnet.com>
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* @author Stig Bakken <ssb@php.net>
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*/
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class PEAR_Dependency
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{
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/**
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* Constructor
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*
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* @access public
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* @param object Registry object
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* @return void
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*/
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function PEAR_Dependency(&$registry)
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{
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$this->registry = &$registry;
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}
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/**
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* This method maps the XML dependency definition to the
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* corresponding one from PEAR_Dependency
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*
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* $opts => Array
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* (
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* [type] => pkg
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* [rel] => ge
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* [version] => 3.4
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* [name] => HTML_Common
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* )
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*
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* @param string Error message
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* @param array Options
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* @return boolean
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*/
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function callCheckMethod(&$errmsg, $opts)
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{
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$rel = isset($opts['rel']) ? $opts['rel'] : 'has';
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$req = isset($opts['version']) ? $opts['version'] : null;
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$name = isset($opts['name']) ? $opts['name'] : null;
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$errmsg = '';
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switch ($opts['type']) {
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case 'pkg':
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return $this->checkPackage($errmsg, $name, $req, $rel);
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break;
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case 'ext':
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return $this->checkExtension($errmsg, $name, $req, $rel);
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break;
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case 'php':
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return $this->checkPHP($errmsg, $req, $rel);
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break;
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case 'prog':
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return $this->checkProgram($errmsg, $name);
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break;
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case 'os':
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return $this->checkOS($errmsg, $name);
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break;
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case 'sapi':
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return $this->checkSAPI($errmsg, $name);
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break;
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case 'zend':
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return $this->checkZend($errmsg, $name);
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break;
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default:
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return "'{$opts['type']}' dependency type not supported";
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}
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}
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/**
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* Package dependencies check method
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*
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* @param string $name Name of the package to test
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* @param string $version The package version required
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* @param string $relation How to compare versions with eachother
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*
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* @return mixed bool false if no error or the error string
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*/
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function checkPackage(&$errmsg, $name, $req = null, $relation = 'has')
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{
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if (substr($relation, 0, 2) == 'v.') {
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$relation = substr($relation, 2);
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}
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switch ($relation) {
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case 'has':
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if (!$this->registry->packageExists($name)) {
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$errmsg = "requires package `$name'";
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return PEAR_DEPENDENCY_MISSING;
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}
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return false;
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case 'not':
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if (!$this->registry->packageExists($name)) {
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$errmsg = "conflicts with package `$name'";
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return PEAR_DEPENDENCY_CONFLICT;
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}
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return false;
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case 'lt':
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case 'le':
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case 'eq':
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case 'ne':
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case 'ge':
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case 'gt':
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$version = $this->registry->packageInfo($name, 'version');
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if (!$this->registry->packageExists($name)
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|| !version_compare("$version", "$req", $relation))
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{
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$errmsg = "requires package `$name' " .
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$this->signOperator($relation) . " $req";
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$code = $this->codeFromRelation($relation, $version, $req);
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return PEAR_DEPENDENCY_MISSING;
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}
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return false;
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}
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$errmsg = "relation '$relation' with requirement '$req' is not supported (name=$name)";
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return PEAR_DEPENDENCY_BAD_DEPENDENCY;
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}
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/**
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* Check package dependencies on uninstall
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*
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* @param string $error The resultant error string
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* @param string $name Name of the package to test
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*
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* @return bool true if there were errors
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*/
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function checkPackageUninstall(&$error, $package)
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{
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$error = null;
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$packages = $this->registry->listPackages();
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foreach ($packages as $pkg) {
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if ($pkg == $package) {
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continue;
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}
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$deps = $this->registry->packageInfo($pkg, 'release_deps');
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if (empty($deps)) {
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continue;
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}
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foreach ($deps as $dep) {
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if ($dep['type'] == 'pkg' && strcasecmp($dep['name'], $package) == 0) {
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$error .= "Package '$pkg' depends on '$package'\n";
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}
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}
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}
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return ($error) ? true : false;
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}
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/**
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* Extension dependencies check method
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*
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* @param string $name Name of the extension to test
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* @param string $req_ext_ver Required extension version to compare with
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* @param string $relation How to compare versions with eachother
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*
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* @return mixed bool false if no error or the error string
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*/
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function checkExtension(&$errmsg, $name, $req = null, $relation = 'has')
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{
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// XXX (ssb): could we avoid loading the extension here?
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if (!PEAR::loadExtension($name)) {
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$errmsg = "'$name' PHP extension is not installed";
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return PEAR_DEPENDENCY_MISSING;
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}
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if ($relation == 'has') {
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return false;
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}
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$code = false;
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if (substr($relation, 0, 2) == 'v.') {
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$ext_ver = phpversion($name);
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$operator = substr($relation, 2);
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// Force params to be strings, otherwise the comparation will fail (ex. 0.9==0.90)
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settype($req, "string");
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if (!version_compare("$ext_ver", "$req", $operator)) {
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$retval = "'$name' PHP extension version " .
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$this->signOperator($operator) . " $req is required";
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$code = $this->codeFromRelation($relation, $ext_ver, $req);
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}
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}
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return $code;
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}
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/**
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* Operating system dependencies check method
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*
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* @param string $os Name of the operating system
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*
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* @return mixed bool false if no error or the error string
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*/
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function checkOS(&$errmsg, $os)
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{
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// XXX Fixme: Implement a more flexible way, like
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// comma separated values or something similar to PEAR_OS
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static $myos;
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if (empty($myos)) {
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include_once "OS/Guess.php";
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$myos = new OS_Guess();
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}
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// only 'has' relation is currently supported
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if ($myos->matchSignature($os)) {
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return false;
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}
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$errmsg = "'$os' operating system not supported";
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return PEAR_DEPENDENCY_CONFLICT;
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}
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/**
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* PHP version check method
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*
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* @param string $req which version to compare
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* @param string $relation how to compare the version
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*
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* @return mixed bool false if no error or the error string
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*/
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function checkPHP(&$errmsg, $req, $relation = 'ge')
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{
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if (substr($req, 0, 2) == 'v.') {
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$req = substr($req,2, strlen($req) - 2);
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}
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$php_ver = phpversion();
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$operator = substr($relation,0,2);
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if (!version_compare("$php_ver", "$req", $operator)) {
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$errmsg = "PHP version " . $this->signOperator($operator) .
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" $req is required";
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return PEAR_DEPENDENCY_CONFLICT;
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}
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return false;
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}
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/**
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* External program check method. Looks for executable files in
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* directories listed in the PATH environment variable.
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*
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* @param string $program which program to look for
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*
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* @return mixed bool false if no error or the error string
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*/
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function checkProgram(&$errmsg, $program)
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{
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// XXX FIXME honor safe mode
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$path_delim = OS_WINDOWS ? ';' : ':';
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$exe_suffix = OS_WINDOWS ? '.exe' : '';
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$path_elements = explode($path_delim, getenv('PATH'));
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foreach ($path_elements as $dir) {
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$file = $dir . DIRECTORY_SEPARATOR . $program . $exe_suffix;
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if (@file_exists($file) && @is_executable($file)) {
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return false;
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}
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}
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$errmsg = "'$program' program is not present in the PATH";
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return PEAR_DEPENDENCY_MISSING;
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}
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/**
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* SAPI backend check method. Version comparison is not yet
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* available here.
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*
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* @param string $name name of SAPI backend
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* @param string $req which version to compare
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* @param string $relation how to compare versions (currently
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* hardcoded to 'has')
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* @return mixed bool false if no error or the error string
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*/
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function checkSAPI(&$errmsg, $name, $req = null, $relation = 'has')
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{
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// XXX Fixme: There is no way to know if the user has or
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// not other SAPI backends installed than the installer one
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$sapi_backend = php_sapi_name();
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// Version comparisons not supported, sapi backends don't have
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// version information yet.
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if ($sapi_backend == $name) {
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return false;
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}
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$errmsg = "'$sapi_backend' SAPI backend not supported";
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return PEAR_DEPENDENCY_CONFLICT;
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}
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/**
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* Zend version check method
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*
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* @param string $req which version to compare
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* @param string $relation how to compare the version
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*
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* @return mixed bool false if no error or the error string
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*/
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function checkZend(&$errmsg, $req, $relation = 'ge')
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{
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if (substr($req, 0, 2) == 'v.') {
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$req = substr($req,2, strlen($req) - 2);
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}
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$zend_ver = zend_version();
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$operator = substr($relation,0,2);
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if (!version_compare("$zend_ver", "$req", $operator)) {
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$errmsg = "Zend version " . $this->signOperator($operator) .
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" $req is required";
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return PEAR_DEPENDENCY_CONFLICT;
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}
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return false;
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}
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/**
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* Converts text comparing operators to them sign equivalents
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*
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* Example: 'ge' to '>='
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*
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* @access public
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* @param string Operator
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* @return string Sign equivalent
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*/
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function signOperator($operator)
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{
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switch($operator) {
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case 'lt': return '<';
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case 'le': return '<=';
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case 'gt': return '>';
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case 'ge': return '>=';
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case 'eq': return '==';
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case 'ne': return '!=';
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default:
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return $operator;
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}
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}
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/**
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* Convert relation into corresponding code
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*
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* @access public
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* @param string Relation
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* @param string Version
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* @param string Requirement
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* @return integer
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*/
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function codeFromRelation($relation, $version, $req)
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{
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$code = PEAR_DEPENDENCY_BAD_DEPENDENCY;
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switch ($relation) {
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case 'gt': case 'ge': case 'eq':
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// upgrade
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$have_major = preg_replace('/\D.*/', '', $version);
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$need_major = preg_replace('/\D.*/', '', $req);
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if ($need_major > $have_major) {
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$code = PEAR_DEPENDENCY_UPGRADE_MAJOR;
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} else {
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$code = PEAR_DEPENDENCY_UPGRADE_MINOR;
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}
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break;
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case 'lt': case 'le': case 'ne':
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$code = PEAR_DEPENDENCY_CONFLICT;
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break;
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}
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return $code;
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}
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}
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?>
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