dependencydb.php

php-4.4.7学习linux时下载的源代码

<?php
/**
 * PEAR_DependencyDB, advanced installed packages dependency database
 *
 * PHP versions 4 and 5
 *
 * LICENSE: This source file is subject to version 3.0 of the PHP license
 * that is available through the world-wide-web at the following URI:
 * http://www.php.net/license/3_0.txt.  If you did not receive a copy of
 * the PHP License and are unable to obtain it through the web, please
 * send a note to [e-mail] so we can mail you a copy immediately.
 *
 * @category   pear
 * @package    PEAR
 * @author     Tomas V. V. Cox <[e-mail]>
 * @author     Greg Beaver <[e-mail]>
 * @copyright  1997-2005 The PHP Group
 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0
 * @version    CVS: $Id: DependencyDB.php,v 1.6.2.2 2005/11/02 16:57:21 cellog Exp $
 * @link       http://pear.php.net/package/PEAR
 * @since      File available since Release 1.4.0a1
 */

/**
 * Needed for error handling
 */
require_once 'PEAR.php';
require_once 'PEAR/Config.php';

/**
 * Track dependency relationships between installed packages
 * @category   pear
 * @package    PEAR
 * @author     Greg Beaver <[e-mail]>
 * @author     Tomas V.V.Cox <[e-mail]>
 * @copyright  1997-2005 The PHP Group
 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0
 * @version    Release: @package_version@
 * @link       http://pear.php.net/package/PEAR
 * @since      Class available since Release 1.4.0a1
 */
class PEAR_DependencyDB
{
    // {{{ properties

    /**
     * This is initialized by {@link setConfig()}
     * @var PEAR_Config
     * @access private
     */
    var $_config;
    /**
     * This is initialized by {@link setConfig()}
     * @var PEAR_Registry
     * @access private
     */
    var $_registry;
    /**
     * Filename of the dependency DB (usually .depdb)
     * @var string
     * @access private
     */
    var $_depdb = false;
    /**
     * File name of the lockfile (usually .depdblock)
     * @var string
     * @access private
     */
    var $_lockfile = false;
    /**
     * Open file resource for locking the lockfile
     * @var resource|false
     * @access private
     */
    var $_lockFp = false;
    /**
     * API version of this class, used to validate a file on-disk
     * @var string
     * @access private
     */
    var $_version = '1.0';
    /**
     * Cached dependency database file
     * @var array|null
     * @access private
     */
    var $_cache;

    // }}}
    // {{{ & singleton()

    /**
     * Get a raw dependency database.  Calls setConfig() and assertDepsDB()
     * @param PEAR_Config
     * @param string|false full path to the dependency database, or false to use default
     * @return PEAR_DependencyDB|PEAR_Error
     * @static
     */
    function &singleton(&$config, $depdb = false)
    {
        if (!isset($GLOBALS['_PEAR_DEPENDENCYDB_INSTANCE']
              [$config->get('php_dir', null, 'pear.php.net')])) {
            $a = new PEAR_DependencyDB;
            $GLOBALS['_PEAR_DEPENDENCYDB_INSTANCE']
              [$config->get('php_dir', null, 'pear.php.net')] = &$a;
            $a->setConfig($config, $depdb);
            if (PEAR::isError($e = $a->assertDepsDB())) {
                return $e;
            }
        }
        return $GLOBALS['_PEAR_DEPENDENCYDB_INSTANCE']
              [$config->get('php_dir', null, 'pear.php.net')];
    }

    /**
     * Set up the registry/location of dependency DB
     * @param PEAR_Config|false
     * @param string|false full path to the dependency database, or false to use default
     */
    function setConfig(&$config, $depdb = false)
    {
        if (!$config) {
            $this->_config = &PEAR_Config::singleton();
        } else {
            $this->_config = &$config;
        }
        $this->_registry = &$this->_config->getRegistry();
        if (!$depdb) {
            $this->_depdb = $this->_config->get('php_dir', null, 'pear.php.net') .
                DIRECTORY_SEPARATOR . '.depdb';
        } else {
            $this->_depdb = $depdb;
        }
        $this->_lockfile = dirname($this->_depdb) . DIRECTORY_SEPARATOR . '.depdblock';
    }
    // }}}

    function hasWriteAccess()
    {
        if (!@file_exists($this->_depdb)) {
            $dir = $this->_depdb;
            while ($dir && $dir != '.') {
                $dir = dirname($dir); // cd ..
                if ($dir != '.' && @file_exists($dir)) {
                    if (@is_writeable($dir)) {
                        return true;
                    } else {
                        return false;
                    }
                }
            }
            return false;
        }
        return @is_writeable($this->_depdb);
    }

    // {{{ assertDepsDB()

    /**
     * Create the dependency database, if it doesn't exist.  Error if the database is
     * newer than the code reading it.
     * @return void|PEAR_Error
     */
    function assertDepsDB()
    {
        if (!is_file($this->_depdb)) {
            $this->rebuildDB();
        } else {
            $depdb = $this->_getDepDB();
            // Datatype format has been changed, rebuild the Deps DB
            if ($depdb['_version'] < $this->_version) {
                $this->rebuildDB();
            }
            if ($depdb['_version']{0} > $this->_version{0}) {
                return PEAR::raiseError('Dependency database is version ' .
                    $depdb['_version'] . ', and we are version ' .
                    $this->_version . ', cannot continue');
            }
        }
    }

    /**
     * Get a list of installed packages that depend on this package
     * @param PEAR_PackageFile_v1|PEAR_PackageFile_v2|array
     * @return array|false
     */
    function getDependentPackages(&$pkg)
    {
        $data = $this->_getDepDB();
        if (is_object($pkg)) {
            $channel = strtolower($pkg->getChannel());
            $package = strtolower($pkg->getPackage());
        } else {
            $channel = strtolower($pkg['channel']);
            $package = strtolower($pkg['package']);
        }
        if (isset($data['packages'][$channel][$package])) {
            return $data['packages'][$channel][$package];
        }
        return false;
    }

    /**
     * Get a list of the actual dependencies of installed packages that depend on
     * a package.
     * @param PEAR_PackageFile_v1|PEAR_PackageFile_v2|array
     * @return array|false
     */
    function getDependentPackageDependencies(&$pkg)
    {
        $data = $this->_getDepDB();
        if (is_object($pkg)) {
            $channel = strtolower($pkg->getChannel());
            $package = strtolower($pkg->getPackage());
        } else {
            $channel = strtolower($pkg['channel']);
            $package = strtolower($pkg['package']);
        }
        $depend = $this->getDependentPackages($pkg);
        if (!$depend) {
            return false;
        }
        $dependencies = array();
        foreach ($depend as $info) {
            $temp = $this->getDependencies($info);
            foreach ($temp as $dep) {
                if (strtolower($dep['dep']['channel']) == strtolower($channel) &&
                      strtolower($dep['dep']['name']) == strtolower($package)) {
                    $dependencies[$info['channel']][$info['package']][] = $dep;
                }
            }
        }
        return $dependencies;
    }

    /**
     * Get a list of dependencies of this installed package
     * @param PEAR_PackageFile_v1|PEAR_PackageFile_v2|array
     * @return array|false
     */
    function getDependencies(&$pkg)
    {
        if (is_object($pkg)) {
            $channel = strtolower($pkg->getChannel());
            $package = strtolower($pkg->getPackage());
        } else {
            $channel = strtolower($pkg['channel']);
            $package = strtolower($pkg['package']);
        }
        $data = $this->_getDepDB();
        if (isset($data['dependencies'][$channel][$package])) {
            return $data['dependencies'][$channel][$package];
        }
        return false;
    }

    /**
     * Determine whether $parent depends on $child, near or deep
     * @param array|PEAR_PackageFile_v2|PEAR_PackageFile_v2
     * @param array|PEAR_PackageFile_v2|PEAR_PackageFile_v2
     */
    function dependsOn($parent, $child)
    {
        $c = array();
        $this->_getDepDB();
        return $this->_dependsOn($parent, $child, $c);
    }
    
    function _dependsOn($parent, $child, &$checked)
    {
        if (is_object($parent)) {
            $channel = strtolower($parent->getChannel());
            $package = strtolower($parent->getPackage());
        } else {
            $channel = strtolower($parent['channel']);
            $package = strtolower($parent['package']);
        }
        if (is_object($child)) {
            $depchannel = strtolower($child->getChannel());
            $deppackage = strtolower($child->getPackage());
        } else {
            $depchannel = strtolower($child['channel']);
            $deppackage = strtolower($child['package']);
        }
        if (isset($checked[$channel][$package][$depchannel][$deppackage])) {
            return false; // avoid endless recursion
        }
        $checked[$channel][$package][$depchannel][$deppackage] = true;
        if (!isset($this->_cache['dependencies'][$channel][$package])) {
            return false;
        }
        foreach ($this->_cache['dependencies'][$channel][$package] as $info) {
            if (strtolower($info['dep']['channel']) == strtolower($depchannel) &&
                  strtolower($info['dep']['name']) == strtolower($deppackage)) {
                return true;
            }
        }
        foreach ($this->_cache['dependencies'][$channel][$package] as $info) {
            if ($this->_dependsOn(array(
                    'channel' => $info['dep']['channel'],
                    'package' => $info['dep']['name']), $child, $checked)) {
                return true;
            }
        }
        return false;
    }

    /**
     * Register dependencies of a package that is being installed or upgraded
     * @param PEAR_PackageFile_v2|PEAR_PackageFile_v2
     */
    function installPackage(&$package)
    {
        $data = $this->_getDepDB();
        unset($this->_cache);
        $this->_setPackageDeps($data, $package);
        $this->_writeDepDB($data);
    }

    /**
     * Remove dependencies of a package that is being uninstalled, or upgraded.
     *
     * Upgraded packages first uninstall, then install
     * @param PEAR_PackageFile_v1|PEAR_PackageFile_v2|array If an array, then it must have
     *        indices 'channel' and 'package'
     */
    function uninstallPackage(&$pkg)
    {