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Edit File : DependencyDB.php \| Size : 23.75 KB
<?php /** * PEAR_DependencyDB, advanced installed packages dependency database * * PHP versions 4 and 5 * * @category pear * @package PEAR * @author Tomas V. V. Cox <cox@idecnet.com> * @author Greg Beaver <cellog@php.net> * @copyright 1997-2009 The Authors * @license http://opensource.org/licenses/bsd-license.php New BSD License * @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'; $GLOBALS['_PEAR_DEPENDENCYDB_INSTANCE'] = array(); /* * Track dependency relationships between installed packages * @category pear * @package PEAR * @author Greg Beaver <cellog@php.net> * @author Tomas V.V.Cox <cox@idec.net.com> * @copyright 1997-2009 The Authors * @license http://opensource.org/licenses/bsd-license.php New BSD License * @version Release: 1.10.16 * @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 $_cache; // }}} // {{{ & singleton() /* * Get a raw dependency database. Calls setConfig() and assertDepsDB() * @param PEAR_Config * @param string\|false full path to the dependency database, or false to use default * @return PEAR_DependencyDB\|PEAR_Error / public static function &singleton(&$config, $depdb = false) { $phpdir = $config->get('php_dir', null, 'pear.php.net'); if (!isset($GLOBALS['_PEAR_DEPENDENCYDB_INSTANCE'][$phpdir])) { $a = new PEAR_DependencyDB; $GLOBALS['_PEAR_DEPENDENCYDB_INSTANCE'][$phpdir] = &$a; $a->setConfig($config, $depdb); $e = $a->assertDepsDB(); if (PEAR::isError($e)) { return $e; } } return $GLOBALS['_PEAR_DEPENDENCYDB_INSTANCE'][$phpdir]; } /* * 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) { $dir = $this->_config->get('metadata_dir', null, 'pear.php.net'); if (!$dir) { $dir = $this->_config->get('php_dir', null, 'pear.php.net'); } $this->_depdb = $dir . 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($dir)) { return true; } return false; } } return false; } return is_writeable($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(); return; } $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 if (is_array($pkg)) { $channel = strtolower($pkg['channel']); $package = strtolower($pkg['package']); } else { return false; } $depend = $this->getDependentPackages($pkg); if (!$depend) { return false; } $dependencies = array(); foreach ($depend as $info) { $temp = $this->getDependencies($info); foreach ($temp as $dep) { if ( isset($dep['dep'], $dep['dep']['channel'], $dep['dep']['name']) && strtolower($dep['dep']['channel']) == $channel && strtolower($dep['dep']['name']) == $package ) { if (!isset($dependencies[$info['channel']])) { $dependencies[$info['channel']] = array(); } if (!isset($dependencies[$info['channel']][$info['package']])) { $dependencies[$info['channel']][$info['package']] = array(); } $dependencies[$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 $info) { if (isset($info['dep']['uri'])) { if (is_object($child)) { if ($info['dep']['uri'] == $child->getURI()) { return true; } } elseif (isset($child['uri'])) { if ($info['dep']['uri'] == $child['uri']) { return true; } } return false; } if (strtolower($info['dep']['channel']) == $depchannel && strtolower($info['dep']['name']) == $deppackage) { return true; } } foreach ($this->_cache['dependencies'][$channel][$package] as $info) { if (isset($info['dep']['uri'])) { if ($this->_dependsOn(array( 'uri' => $info['dep']['uri'], 'package' => $info['dep']['name']), $child, $checked)) { return true; } } else { if ($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) { $data = $this->_getDepDB(); unset($this->_cache); if (is_object($pkg)) { $channel = strtolower($pkg->getChannel()); $package = strtolower($pkg->getPackage()); } else { $channel = strtolower($pkg['channel']); $package = strtolower($pkg['package']); } if (!isset($data['dependencies'][$channel][$package])) { return true; } foreach ($data['dependencies'][$channel][$package] as $dep) { $found = false; $depchannel = isset($dep['dep']['uri']) ? '__uri' : strtolower($dep['dep']['channel']); $depname = strtolower($dep['dep']['name']); if (isset($data['packages'][$depchannel][$depname])) { foreach ($data['packages'][$depchannel][$depname] as $i => $info) { if ($info['channel'] == $channel && $info['package'] == $package) { $found = true; break; } } } if ($found) { unset($data['packages'][$depchannel][$depname][$i]); if (!count($data['packages'][$depchannel][$depname])) { unset($data['packages'][$depchannel][$depname]); if (!count($data['packages'][$depchannel])) { unset($data['packages'][$depchannel]); } } else { $data['packages'][$depchannel][$depname] = array_values($data['packages'][$depchannel][$depname]); } } } unset($data['dependencies'][$channel][$package]); if (!count($data['dependencies'][$channel])) { unset($data['dependencies'][$channel]); } if (!count($data['dependencies'])) { unset($data['dependencies']); } if (!count($data['packages'])) { unset($data['packages']); } $this->_writeDepDB($data); } /* * Rebuild the dependency DB by reading registry entries. * @return true\|PEAR_Error / function rebuildDB() { $depdb = array('_version' => $this->_version); if (!$this->hasWriteAccess()) { // allow startup for read-only with older Registry return $depdb; } $packages = $this->_registry->listAllPackages(); if (PEAR::isError($packages)) { return $packages; } foreach ($packages as $channel => $ps) { foreach ($ps as $package) { $package = $this->_registry->getPackage($package, $channel); if (PEAR::isError($package)) { return $package; } $this->_setPackageDeps($depdb, $package); } } $error = $this->_writeDepDB($depdb); if (PEAR::isError($error)) { return $error; } $this->_cache = $depdb; return true; } /* * Register usage of the dependency DB to prevent race conditions * @param int one of the LOCK_* constants * @return true\|PEAR_Error * @access private / function _lock($mode = LOCK_EX) { if (stristr(php_uname(), 'Windows 9')) { return true; } if ($mode != LOCK_UN && is_resource($this->_lockFp)) { // XXX does not check type of lock (LOCK_SH/LOCK_EX) return true; } $open_mode = 'w'; // XXX People reported problems with LOCK_SH and 'w' if ($mode === LOCK_SH) { if (!file_exists($this->_lockfile)) { touch($this->_lockfile); } elseif (!is_file($this->_lockfile)) { return PEAR::raiseError('could not create Dependency lock file, ' . 'it exists and is not a regular file'); } $open_mode = 'r'; } if (!is_resource($this->_lockFp)) { $this->_lockFp = @fopen($this->_lockfile, $open_mode); } if (!is_resource($this->_lockFp)) { $last_errormsg = ''; $last_error = error_get_last(); if (!empty($last_error['message'])) { $last_errormsg = $last_error['message']; } return PEAR::raiseError("could not create Dependency lock file" . (isset($last_errormsg) ? ": " . $last_errormsg : "")); } if (!(int)flock($this->_lockFp, $mode)) { switch ($mode) { case LOCK_SH: $str = 'shared'; break; case LOCK_EX: $str = 'exclusive'; break; case LOCK_UN: $str = 'unlock'; break; default: $str = 'unknown'; break; } return PEAR::raiseError("could not acquire $str lock ($this->_lockfile)"); } return true; } /* * Release usage of dependency DB * @return true\|PEAR_Error * @access private / function _unlock() { $ret = $this->_lock(LOCK_UN); if (is_resource($this->_lockFp)) { fclose($this->_lockFp); } $this->_lockFp = null; return $ret; } /* * Load the dependency database from disk, or return the cache * @return array\|PEAR_Error / function _getDepDB() { if (!$this->hasWriteAccess()) { return array('_version' => $this->_version); } if (isset($this->_cache)) { return $this->_cache; } if (!$fp = fopen($this->_depdb, 'r')) { $err = PEAR::raiseError("Could not open dependencies file `".$this->_depdb."'"); return $err; } clearstatcache(); fclose($fp); $data = @unserialize(file_get_contents($this->_depdb)); $this->_cache = $data; return $data; } /* * Write out the dependency database to disk * @param array the database * @return true\|PEAR_Error * @access private / function _writeDepDB(&$deps) { if (PEAR::isError($e = $this->_lock(LOCK_EX))) { return $e; } if (!$fp = fopen($this->_depdb, 'wb')) { $this->_unlock(); return PEAR::raiseError("Could not open dependencies file `".$this->_depdb."' for writing"); } fwrite($fp, serialize($deps)); fclose($fp); $this->_unlock(); $this->_cache = $deps; return true; } /* * Register all dependencies from a package in the dependencies database, in essence * "installing" the package's dependency information * @param array the database * @param PEAR_PackageFile_v1\|PEAR_PackageFile_v2 * @access private / function _setPackageDeps(&$data, &$pkg) { $pkg->setConfig($this->_config); if ($pkg->getPackagexmlVersion() == '1.0') { $gen = &$pkg->getDefaultGenerator(); $deps = $gen->dependenciesToV2(); } else { $deps = $pkg->getDeps(true); } if (!$deps) { return; } if (!is_array($data)) { $data = array(); } if (!isset($data['dependencies'])) { $data['dependencies'] = array(); } $channel = strtolower($pkg->getChannel()); $package = strtolower($pkg->getPackage()); if (!isset($data['dependencies'][$channel])) { $data['dependencies'][$channel] = array(); } $data['dependencies'][$channel][$package] = array(); if (isset($deps['required']['package'])) { if (!isset($deps['required']['package'][0])) { $deps['required']['package'] = array($deps['required']['package']); } foreach ($deps['required']['package'] as $dep) { $this->_registerDep($data, $pkg, $dep, 'required'); } } if (isset($deps['optional']['package'])) { if (!isset($deps['optional']['package'][0])) { $deps['optional']['package'] = array($deps['optional']['package']); } foreach ($deps['optional']['package'] as $dep) { $this->_registerDep($data, $pkg, $dep, 'optional'); } } if (isset($deps['required']['subpackage'])) { if (!isset($deps['required']['subpackage'][0])) { $deps['required']['subpackage'] = array($deps['required']['subpackage']); } foreach ($deps['required']['subpackage'] as $dep) { $this->_registerDep($data, $pkg, $dep, 'required'); } } if (isset($deps['optional']['subpackage'])) { if (!isset($deps['optional']['subpackage'][0])) { $deps['optional']['subpackage'] = array($deps['optional']['subpackage']); } foreach ($deps['optional']['subpackage'] as $dep) { $this->_registerDep($data, $pkg, $dep, 'optional'); } } if (isset($deps['group'])) { if (!isset($deps['group'][0])) { $deps['group'] = array($deps['group']); } foreach ($deps['group'] as $group) { if (isset($group['package'])) { if (!isset($group['package'][0])) { $group['package'] = array($group['package']); } foreach ($group['package'] as $dep) { $this->_registerDep($data, $pkg, $dep, 'optional', $group['attribs']['name']); } } if (isset($group['subpackage'])) { if (!isset($group['subpackage'][0])) { $group['subpackage'] = array($group['subpackage']); } foreach ($group['subpackage'] as $dep) { $this->_registerDep($data, $pkg, $dep, 'optional', $group['attribs']['name']); } } } } if ($data['dependencies'][$channel][$package] == array()) { unset($data['dependencies'][$channel][$package]); if (!count($data['dependencies'][$channel])) { unset($data['dependencies'][$channel]); } } } /* * @param array the database * @param PEAR_PackageFile_v1\|PEAR_PackageFile_v2 * @param array the specific dependency * @param required\|optional whether this is a required or an optional dep * @param string\|false dependency group this dependency is from, or false for ordinary dep */ function _registerDep(&$data, &$pkg, $dep, $type, $group = false) { $info = array( 'dep' => $dep, 'type' => $type, 'group' => $group ); $dep = array_map('strtolower', $dep); $depchannel = isset($dep['channel']) ? $dep['channel'] : '__uri'; if (!isset($data['dependencies'])) { $data['dependencies'] = array(); } $channel = strtolower($pkg->getChannel()); $package = strtolower($pkg->getPackage()); if (!isset($data['dependencies'][$channel])) { $data['dependencies'][$channel] = array(); } if (!isset($data['dependencies'][$channel][$package])) { $data['dependencies'][$channel][$package] = array(); } $data['dependencies'][$channel][$package][] = $info; if (isset($data['packages'][$depchannel][$dep['name']])) { $found = false; foreach ($data['packages'][$depchannel][$dep['name']] as $i => $p) { if ($p['channel'] == $channel && $p['package'] == $package) { $found = true; break; } } } else { if (!isset($data['packages'])) { $data['packages'] = array(); } if (!isset($data['packages'][$depchannel])) { $data['packages'][$depchannel] = array(); } if (!isset($data['packages'][$depchannel][$dep['name']])) { $data['packages'][$depchannel][$dep['name']] = array(); } $found = false; } if (!$found) { $data['packages'][$depchannel][$dep['name']][] = array( 'channel' => $channel, 'package' => $package ); } } } Back

Edit File : DependencyDB.php | Size : 23.75 KB

<?php
/**
 * PEAR_DependencyDB, advanced installed packages dependency database
 *
 * PHP versions 4 and 5
 *
 * @category   pear
 * @package    PEAR
 * @author     Tomas V. V. Cox <cox@idecnet.com>
 * @author     Greg Beaver <cellog@php.net>
 * @copyright  1997-2009 The Authors
 * @license    http://opensource.org/licenses/bsd-license.php New BSD License
 * @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';

$GLOBALS['_PEAR_DEPENDENCYDB_INSTANCE'] = array();
/**
 * Track dependency relationships between installed packages
 * @category   pear
 * @package    PEAR
 * @author     Greg Beaver <cellog@php.net>
 * @author     Tomas V.V.Cox <cox@idec.net.com>
 * @copyright  1997-2009 The Authors
 * @license    http://opensource.org/licenses/bsd-license.php New BSD License
 * @version    Release: 1.10.16
 * @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
     */
    public static function &singleton(&$config, $depdb = false)
    {
        $phpdir = $config->get('php_dir', null, 'pear.php.net');
        if (!isset($GLOBALS['_PEAR_DEPENDENCYDB_INSTANCE'][$phpdir])) {
            $a = new PEAR_DependencyDB;
            $GLOBALS['_PEAR_DEPENDENCYDB_INSTANCE'][$phpdir] = &$a;
            $a->setConfig($config, $depdb);
            $e = $a->assertDepsDB();
            if (PEAR::isError($e)) {
                return $e;
            }
        }

return $GLOBALS['_PEAR_DEPENDENCYDB_INSTANCE'][$phpdir];
    }

/**
     * 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) {
            $dir = $this->_config->get('metadata_dir', null, 'pear.php.net');
            if (!$dir) {
                $dir = $this->_config->get('php_dir', null, 'pear.php.net');
            }
            $this->_depdb =  $dir . 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;
                    }

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();
            return;
        }

$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 if (is_array($pkg)) {
            $channel = strtolower($pkg['channel']);
            $package = strtolower($pkg['package']);
        } else {
            return false;
        }

$depend = $this->getDependentPackages($pkg);
        if (!$depend) {
            return false;
        }

$dependencies = array();
        foreach ($depend as $info) {
            $temp = $this->getDependencies($info);
            foreach ($temp as $dep) {
                if (
                    isset($dep['dep'], $dep['dep']['channel'], $dep['dep']['name']) &&
                    strtolower($dep['dep']['channel']) == $channel &&
                    strtolower($dep['dep']['name']) == $package
                ) {
                    if (!isset($dependencies[$info['channel']])) {
                        $dependencies[$info['channel']] = array();
                    }

if (!isset($dependencies[$info['channel']][$info['package']])) {
                        $dependencies[$info['channel']][$info['package']] = array();
                    }
                    $dependencies[$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 $info) {
            if (isset($info['dep']['uri'])) {
                if (is_object($child)) {
                    if ($info['dep']['uri'] == $child->getURI()) {
                        return true;
                    }
                } elseif (isset($child['uri'])) {
                    if ($info['dep']['uri'] == $child['uri']) {
                        return true;
                    }
                }
                return false;
            }

if (strtolower($info['dep']['channel']) == $depchannel &&
                  strtolower($info['dep']['name']) == $deppackage) {
                return true;
            }
        }

foreach ($this->_cache['dependencies'][$channel][$package] as $info) {
            if (isset($info['dep']['uri'])) {
                if ($this->_dependsOn(array(
                        'uri' => $info['dep']['uri'],
                        'package' => $info['dep']['name']), $child, $checked)) {
                    return true;
                }
            } else {
                if ($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)
    {
        $data = $this->_getDepDB();
        unset($this->_cache);
        if (is_object($pkg)) {
            $channel = strtolower($pkg->getChannel());
            $package = strtolower($pkg->getPackage());
        } else {
            $channel = strtolower($pkg['channel']);
            $package = strtolower($pkg['package']);
        }

if (!isset($data['dependencies'][$channel][$package])) {
            return true;
        }

foreach ($data['dependencies'][$channel][$package] as $dep) {
            $found      = false;
            $depchannel = isset($dep['dep']['uri']) ? '__uri' : strtolower($dep['dep']['channel']);
            $depname    = strtolower($dep['dep']['name']);
            if (isset($data['packages'][$depchannel][$depname])) {
                foreach ($data['packages'][$depchannel][$depname] as $i => $info) {
                    if ($info['channel'] == $channel && $info['package'] == $package) {
                        $found = true;
                        break;
                    }
                }
            }

if ($found) {
                unset($data['packages'][$depchannel][$depname][$i]);
                if (!count($data['packages'][$depchannel][$depname])) {
                    unset($data['packages'][$depchannel][$depname]);
                    if (!count($data['packages'][$depchannel])) {
                        unset($data['packages'][$depchannel]);
                    }
                } else {
                    $data['packages'][$depchannel][$depname] =
                        array_values($data['packages'][$depchannel][$depname]);
                }
            }
        }

unset($data['dependencies'][$channel][$package]);
        if (!count($data['dependencies'][$channel])) {
            unset($data['dependencies'][$channel]);
        }

if (!count($data['dependencies'])) {
            unset($data['dependencies']);
        }

if (!count($data['packages'])) {
            unset($data['packages']);
        }

$this->_writeDepDB($data);
    }

/**
     * Rebuild the dependency DB by reading registry entries.
     * @return true|PEAR_Error
     */
    function rebuildDB()
    {
        $depdb = array('_version' => $this->_version);
        if (!$this->hasWriteAccess()) {
            // allow startup for read-only with older Registry
            return $depdb;
        }

$packages = $this->_registry->listAllPackages();
        if (PEAR::isError($packages)) {
            return $packages;
        }

foreach ($packages as $channel => $ps) {
            foreach ($ps as $package) {
                $package = $this->_registry->getPackage($package, $channel);
                if (PEAR::isError($package)) {
                    return $package;
                }
                $this->_setPackageDeps($depdb, $package);
            }
        }

$error = $this->_writeDepDB($depdb);
        if (PEAR::isError($error)) {
            return $error;
        }

$this->_cache = $depdb;
        return true;
    }

/**
     * Register usage of the dependency DB to prevent race conditions
     * @param int one of the LOCK_* constants
     * @return true|PEAR_Error
     * @access private
     */
    function _lock($mode = LOCK_EX)
    {
        if (stristr(php_uname(), 'Windows 9')) {
            return true;
        }

if ($mode != LOCK_UN && is_resource($this->_lockFp)) {
            // XXX does not check type of lock (LOCK_SH/LOCK_EX)
            return true;
        }

$open_mode = 'w';
        // XXX People reported problems with LOCK_SH and 'w'
        if ($mode === LOCK_SH) {
            if (!file_exists($this->_lockfile)) {
                touch($this->_lockfile);
            } elseif (!is_file($this->_lockfile)) {
                return PEAR::raiseError('could not create Dependency lock file, ' .
                    'it exists and is not a regular file');
            }
            $open_mode = 'r';
        }

if (!is_resource($this->_lockFp)) {
            $this->_lockFp = @fopen($this->_lockfile, $open_mode);
        }

if (!is_resource($this->_lockFp)) {
            $last_errormsg = '';
            $last_error = error_get_last();
            if (!empty($last_error['message'])) {
                $last_errormsg = $last_error['message'];
            }
            return PEAR::raiseError("could not create Dependency lock file" .
                                     (isset($last_errormsg) ? ": " . $last_errormsg : ""));
        }

if (!(int)flock($this->_lockFp, $mode)) {
            switch ($mode) {
                case LOCK_SH: $str = 'shared';    break;
                case LOCK_EX: $str = 'exclusive'; break;
                case LOCK_UN: $str = 'unlock';    break;
                default:      $str = 'unknown';   break;
            }

return PEAR::raiseError("could not acquire $str lock ($this->_lockfile)");
        }

return true;
    }

/**
     * Release usage of dependency DB
     * @return true|PEAR_Error
     * @access private
     */
    function _unlock()
    {
        $ret = $this->_lock(LOCK_UN);
        if (is_resource($this->_lockFp)) {
            fclose($this->_lockFp);
        }
        $this->_lockFp = null;
        return $ret;
    }

/**
     * Load the dependency database from disk, or return the cache
     * @return array|PEAR_Error
     */
    function _getDepDB()
    {
        if (!$this->hasWriteAccess()) {
            return array('_version' => $this->_version);
        }

if (isset($this->_cache)) {
            return $this->_cache;
        }

if (!$fp = fopen($this->_depdb, 'r')) {
            $err = PEAR::raiseError("Could not open dependencies file `".$this->_depdb."'");
            return $err;
        }

clearstatcache();
        fclose($fp);
        $data = @unserialize(file_get_contents($this->_depdb));
        $this->_cache = $data;
        return $data;
    }

/**
     * Write out the dependency database to disk
     * @param array the database
     * @return true|PEAR_Error
     * @access private
     */
    function _writeDepDB(&$deps)
    {
        if (PEAR::isError($e = $this->_lock(LOCK_EX))) {
            return $e;
        }

if (!$fp = fopen($this->_depdb, 'wb')) {
            $this->_unlock();
            return PEAR::raiseError("Could not open dependencies file `".$this->_depdb."' for writing");
        }

fwrite($fp, serialize($deps));
        fclose($fp);
        $this->_unlock();
        $this->_cache = $deps;
        return true;
    }

/**
     * Register all dependencies from a package in the dependencies database, in essence
     * "installing" the package's dependency information
     * @param array the database
     * @param PEAR_PackageFile_v1|PEAR_PackageFile_v2
     * @access private
     */
    function _setPackageDeps(&$data, &$pkg)
    {
        $pkg->setConfig($this->_config);
        if ($pkg->getPackagexmlVersion() == '1.0') {
            $gen = &$pkg->getDefaultGenerator();
            $deps = $gen->dependenciesToV2();
        } else {
            $deps = $pkg->getDeps(true);
        }

if (!$deps) {
            return;
        }

if (!is_array($data)) {
            $data = array();
        }

if (!isset($data['dependencies'])) {
            $data['dependencies'] = array();
        }

$channel = strtolower($pkg->getChannel());
        $package = strtolower($pkg->getPackage());

if (!isset($data['dependencies'][$channel])) {
            $data['dependencies'][$channel] = array();
        }

$data['dependencies'][$channel][$package] = array();
        if (isset($deps['required']['package'])) {
            if (!isset($deps['required']['package'][0])) {
                $deps['required']['package'] = array($deps['required']['package']);
            }

foreach ($deps['required']['package'] as $dep) {
                $this->_registerDep($data, $pkg, $dep, 'required');
            }
        }

if (isset($deps['optional']['package'])) {
            if (!isset($deps['optional']['package'][0])) {
                $deps['optional']['package'] = array($deps['optional']['package']);
            }

foreach ($deps['optional']['package'] as $dep) {
                $this->_registerDep($data, $pkg, $dep, 'optional');
            }
        }

if (isset($deps['required']['subpackage'])) {
            if (!isset($deps['required']['subpackage'][0])) {
                $deps['required']['subpackage'] = array($deps['required']['subpackage']);
            }

foreach ($deps['required']['subpackage'] as $dep) {
                $this->_registerDep($data, $pkg, $dep, 'required');
            }
        }

if (isset($deps['optional']['subpackage'])) {
            if (!isset($deps['optional']['subpackage'][0])) {
                $deps['optional']['subpackage'] = array($deps['optional']['subpackage']);
            }

foreach ($deps['optional']['subpackage'] as $dep) {
                $this->_registerDep($data, $pkg, $dep, 'optional');
            }
        }

if (isset($deps['group'])) {
            if (!isset($deps['group'][0])) {
                $deps['group'] = array($deps['group']);
            }

foreach ($deps['group'] as $group) {
                if (isset($group['package'])) {
                    if (!isset($group['package'][0])) {
                        $group['package'] = array($group['package']);
                    }

foreach ($group['package'] as $dep) {
                        $this->_registerDep($data, $pkg, $dep, 'optional',
                            $group['attribs']['name']);
                    }
                }

if (isset($group['subpackage'])) {
                    if (!isset($group['subpackage'][0])) {
                        $group['subpackage'] = array($group['subpackage']);
                    }

foreach ($group['subpackage'] as $dep) {
                        $this->_registerDep($data, $pkg, $dep, 'optional',
                            $group['attribs']['name']);
                    }
                }
            }
        }

if ($data['dependencies'][$channel][$package] == array()) {
            unset($data['dependencies'][$channel][$package]);
            if (!count($data['dependencies'][$channel])) {
                unset($data['dependencies'][$channel]);
            }
        }
    }

/**
     * @param array the database
     * @param PEAR_PackageFile_v1|PEAR_PackageFile_v2
     * @param array the specific dependency
     * @param required|optional whether this is a required or an optional dep
     * @param string|false dependency group this dependency is from, or false for ordinary dep
     */
    function _registerDep(&$data, &$pkg, $dep, $type, $group = false)
    {
        $info = array(
            'dep'   => $dep,
            'type'  => $type,
            'group' => $group
        );

$dep  = array_map('strtolower', $dep);
        $depchannel = isset($dep['channel']) ? $dep['channel'] : '__uri';
        if (!isset($data['dependencies'])) {
            $data['dependencies'] = array();
        }

$channel = strtolower($pkg->getChannel());
        $package = strtolower($pkg->getPackage());

if (!isset($data['dependencies'][$channel])) {
            $data['dependencies'][$channel] = array();
        }

if (!isset($data['dependencies'][$channel][$package])) {
            $data['dependencies'][$channel][$package] = array();
        }

$data['dependencies'][$channel][$package][] = $info;
        if (isset($data['packages'][$depchannel][$dep['name']])) {
            $found = false;
            foreach ($data['packages'][$depchannel][$dep['name']] as $i => $p) {
                if ($p['channel'] == $channel && $p['package'] == $package) {
                    $found = true;
                    break;
                }
            }
        } else {
            if (!isset($data['packages'])) {
                $data['packages'] = array();
            }

if (!isset($data['packages'][$depchannel])) {
                $data['packages'][$depchannel] = array();
            }

if (!isset($data['packages'][$depchannel][$dep['name']])) {
                $data['packages'][$depchannel][$dep['name']] = array();
            }

$found = false;
        }

if (!$found) {
            $data['packages'][$depchannel][$dep['name']][] = array(
                'channel' => $channel,
                'package' => $package
            );
        }
    }
}

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