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/**
 * PEAR_DependencyDB, advanced installed packages dependency database
 *
 * PHP versions 4 and 5
 *
 * @category   pear
 * @package    PEAR
 * @author     Tomas V. V. Cox &lt;cox@idecnet.com&gt;
 * @author     Greg Beaver &lt;cellog@php.net&gt;
 * @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 &lt;cellog@php.net&gt;
 * @author     Tomas V.V.Cox &lt;cox@idec.net.com&gt;
 * @copyright  1997-2009 The Authors
 * @license    http://opensource.org/licenses/bsd-license.php New BSD License
 * @version    Release: 1.10.18
 * @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;

    // }}}
    // {{{ &amp; 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 &amp;singleton(&amp;$config, $depdb = false)
    {
        $phpdir = $config-&gt;get('php_dir', null, 'pear.php.net');
        if (!isset($GLOBALS['_PEAR_DEPENDENCYDB_INSTANCE'][$phpdir])) {
            $a = new PEAR_DependencyDB;
            $GLOBALS['_PEAR_DEPENDENCYDB_INSTANCE'][$phpdir] = &amp;$a;
            $a-&gt;setConfig($config, $depdb);
            $e = $a-&gt;assertDepsDB();
            if (PEAR::isError($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(&amp;$config, $depdb = false)
    {
        if (!$config) {
            $this-&gt;_config = &amp;PEAR_Config::singleton();
        } else {
            $this-&gt;_config = &amp;$config;
        }

        $this-&gt;_registry = &amp;$this-&gt;_config-&gt;getRegistry();
        if (!$depdb) {
            $dir = $this-&gt;_config-&gt;get('metadata_dir', null, 'pear.php.net');
            if (!$dir) {
                $dir = $this-&gt;_config-&gt;get('php_dir', null, 'pear.php.net');
            }
            $this-&gt;_depdb =  $dir . DIRECTORY_SEPARATOR . '.depdb';
        } else {
            $this-&gt;_depdb = $depdb;
        }

        $this-&gt;_lockfile = dirname($this-&gt;_depdb) . DIRECTORY_SEPARATOR . '.depdblock';
    }
    // }}}

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

                    return false;
                }
            }

            return false;
        }

        return is_writeable($this-&gt;_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-&gt;_depdb)) {
            $this-&gt;rebuildDB();
            return;
        }

        $depdb = $this-&gt;_getDepDB();
        // Datatype format has been changed, rebuild the Deps DB
        if ($depdb['_version'] &lt; $this-&gt;_version) {
            $this-&gt;rebuildDB();
        }

        if ($depdb['_version'][0] &gt; $this-&gt;_version[0]) {
            return PEAR::raiseError('Dependency database is version ' .
                $depdb['_version'] . ', and we are version ' .
                $this-&gt;_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(&amp;$pkg)
    {
        $data = $this-&gt;_getDepDB();
        if (is_object($pkg)) {
            $channel = strtolower($pkg-&gt;getChannel());
            $package = strtolower($pkg-&gt;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(&amp;$pkg)
    {
        $data = $this-&gt;_getDepDB();
        if (is_object($pkg)) {
            $channel = strtolower($pkg-&gt;getChannel());
            $package = strtolower($pkg-&gt;getPackage());
        } else if (is_array($pkg)) {
            $channel = strtolower($pkg['channel']);
            $package = strtolower($pkg['package']);
        } else {
            return false;
        }

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

        $dependencies = array();
        foreach ($depend as $info) {
            $temp = $this-&gt;getDependencies($info);
            foreach ($temp as $dep) {
                if (
                    isset($dep['dep'], $dep['dep']['channel'], $dep['dep']['name']) &amp;&amp;
                    strtolower($dep['dep']['channel']) == $channel &amp;&amp;
                    strtolower($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(&amp;$pkg)
    {
        if (is_object($pkg)) {
            $channel = strtolower($pkg-&gt;getChannel());
            $package = strtolower($pkg-&gt;getPackage());
        } else {
            $channel = strtolower($pkg['channel']);
            $package = strtolower($pkg['package']);
        }

        $data = $this-&gt;_getDepDB();
        if (isset($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-&gt;_getDepDB();
        return $this-&gt;_dependsOn($parent, $child, $c);
    }

    function _dependsOn($parent, $child, &amp;$checked)
    {
        if (is_object($parent)) {
            $channel = strtolower($parent-&gt;getChannel());
            $package = strtolower($parent-&gt;getPackage());
        } else {
            $channel = strtolower($parent['channel']);
            $package = strtolower($parent['package']);
        }

        if (is_object($child)) {
            $depchannel = strtolower($child-&gt;getChannel());
            $deppackage = strtolower($child-&gt;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-&gt;_cache['dependencies'][$channel][$package])) {
            return false;
        }

        foreach ($this-&gt;_cache['dependencies'][$channel][$package] as $info) {
            if (isset($info['dep']['uri'])) {
                if (is_object($child)) {
                    if ($info['dep']['uri'] == $child-&gt;getURI()) {
                        return true;
                    }
                } elseif (isset($child['uri'])) {
                    if ($info['dep']['uri'] == $child['uri']) {
                        return true;
                    }
                }
                return false;
            }

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

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

        $this-&gt;_writeDepDB($data);
    }

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

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

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

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

        $this-&gt;_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 ($mode != LOCK_UN &amp;&amp; is_resource($this-&gt;_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($this-&gt;_lockfile)) {
                touch($this-&gt;_lockfile);
            } elseif (!is_file($this-&gt;_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-&gt;_lockFp)) {
            $this-&gt;_lockFp = @fopen($this-&gt;_lockfile, $open_mode);
        }

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

        if (!(int)flock($this-&gt;_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(&quot;could not acquire $str lock ($this-&gt;_lockfile)&quot;);
        }

        return true;
    }

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

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

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

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

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

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

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

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

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

        if (!$deps) {
            return;
        }

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

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

        $channel = strtolower($pkg-&gt;getChannel());
        $package = strtolower($pkg-&gt;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) {
                $this-&gt;_registerDep($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) {
                $this-&gt;_registerDep($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) {
                $this-&gt;_registerDep($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) {
                $this-&gt;_registerDep($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) {
                        $this-&gt;_registerDep($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) {
                        $this-&gt;_registerDep($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(&amp;$data, &amp;$pkg, $dep, $type, $group = false)
    {
        $info = array(
            'dep'   =&gt; $dep,
            'type'  =&gt; $type,
            'group' =&gt; $group
        );

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

        $channel = strtolower($pkg-&gt;getChannel());
        $package = strtolower($pkg-&gt;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 =&gt; $p) {
                if ($p['channel'] == $channel &amp;&amp; $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' =&gt; $channel,
                'package' =&gt; $package
            );
        }
    }
}
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