config.php

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            'default' => PEAR_CONFIG_DEFAULT_BIN_DIR,
            'doc' => 'directory where executables are installed',
            'prompt' => 'PEAR executables directory',
            'group' => 'File Locations',
            ),
        'data_dir' => array(
            'type' => 'directory',
            'default' => PEAR_CONFIG_DEFAULT_DATA_DIR,
            'doc' => 'directory where data files are installed',
            'prompt' => 'PEAR data directory',
            'group' => 'File Locations (Advanced)',
            ),
        'test_dir' => array(
            'type' => 'directory',
            'default' => PEAR_CONFIG_DEFAULT_TEST_DIR,
            'doc' => 'directory where regression tests are installed',
            'prompt' => 'PEAR test directory',
            'group' => 'File Locations (Advanced)',
            ),
        'cache_dir' => array(
            'type' => 'directory',
            'default' => PEAR_CONFIG_DEFAULT_CACHE_DIR,
            'doc' => 'directory which is used for XMLRPC cache',
            'prompt' => 'PEAR Installer cache directory',
            'group' => 'File Locations (Advanced)',
            ),
        'php_bin' => array(
            'type' => 'file',
            'default' => PEAR_CONFIG_DEFAULT_PHP_BIN,
            'doc' => 'PHP CLI/CGI binary for executing scripts',
            'prompt' => 'PHP CLI/CGI binary',
            'group' => 'File Locations (Advanced)',
            ),
        // Maintainers
        'username' => array(
            'type' => 'string',
            'default' => '',
            'doc' => '(maintainers) your PEAR account name',
            'prompt' => 'PEAR username (for maintainers)',
            'group' => 'Maintainers',
            ),
        'password' => array(
            'type' => 'password',
            'default' => '',
            'doc' => '(maintainers) your PEAR account password',
            'prompt' => 'PEAR password (for maintainers)',
            'group' => 'Maintainers',
            ),
        // Advanced
        'verbose' => array(
            'type' => 'integer',
            'default' => PEAR_CONFIG_DEFAULT_VERBOSE,
            'doc' => 'verbosity level
0: really quiet
1: somewhat quiet
2: verbose
3: debug',
            'prompt' => 'Debug Log Level',
            'group' => 'Advanced',
            ),
        'preferred_state' => array(
            'type' => 'set',
            'default' => PEAR_CONFIG_DEFAULT_PREFERRED_STATE,
            'doc' => 'the installer will prefer releases with this state when installing packages without a version or state specified',
            'valid_set' => array(
                'stable', 'beta', 'alpha', 'devel', 'snapshot'),
            'prompt' => 'Preferred Package State',
            'group' => 'Advanced',
            ),
        'umask' => array(
            'type' => 'mask',
            'default' => PEAR_CONFIG_DEFAULT_UMASK,
            'doc' => 'umask used when creating files (Unix-like systems only)',
            'prompt' => 'Unix file mask',
            'group' => 'Advanced',
            ),
        'cache_ttl' => array(
            'type' => 'integer',
            'default' => PEAR_CONFIG_DEFAULT_CACHE_TTL,
            'doc' => 'amount of secs where the local cache is used and not updated',
            'prompt' => 'Cache TimeToLive',
            'group' => 'Advanced',
            ),
        'sig_type' => array(
            'type' => 'set',
            'default' => PEAR_CONFIG_DEFAULT_SIG_TYPE,
            'doc' => 'which package signature mechanism to use',
            'valid_set' => array('gpg'),
            'prompt' => 'Package Signature Type',
            'group' => 'Maintainers',
            ),
        'sig_bin' => array(
            'type' => 'string',
            'default' => PEAR_CONFIG_DEFAULT_SIG_BIN,
            'doc' => 'which package signature mechanism to use',
            'prompt' => 'Signature Handling Program',
            'group' => 'Maintainers',
            ),
        'sig_keyid' => array(
            'type' => 'string',
            'default' => '',
            'doc' => 'which key to use for signing with',
            'prompt' => 'Signature Key Id',
            'group' => 'Maintainers',
            ),
        'sig_keydir' => array(
            'type' => 'directory',
            'default' => PEAR_CONFIG_DEFAULT_SIG_KEYDIR,
            'doc' => 'directory where signature keys are located',
            'prompt' => 'Signature Key Directory',
            'group' => 'Maintainers',
            ),
        // __channels is reserved - used for channel-specific configuration
        );

    // }}}

    // {{{ PEAR_Config([file], [defaults_file])

    /**
     * Constructor.
     *
     * @param string file to read user-defined options from
     * @param string file to read system-wide defaults from
     * @param bool   determines whether a registry object "follows"
     *               the value of php_dir (is automatically created
     *               and moved when php_dir is changed)
     * @param bool   if true, fails if configuration files cannot be loaded
     *
     * @access public
     *
     * @see PEAR_Config::singleton
     */
    function PEAR_Config($user_file = '', $system_file = '', $ftp_file = false,
                         $strict = true)
    {
        $this->PEAR();
        PEAR_Installer_Role::initializeConfig($this);
        $sl = DIRECTORY_SEPARATOR;
        if (empty($user_file)) {
            if (OS_WINDOWS) {
                $user_file = PEAR_CONFIG_SYSCONFDIR . $sl . 'pear.ini';
            } else {
                $user_file = getenv('HOME') . $sl . '.pearrc';
            }
        }
        if (empty($system_file)) {
            if (OS_WINDOWS) {
                $system_file = PEAR_CONFIG_SYSCONFDIR . $sl . 'pearsys.ini';
            } else {
                $system_file = PEAR_CONFIG_SYSCONFDIR . $sl . 'pear.conf';
            }
        }

        $this->layers = array_keys($this->configuration);
        $this->files['user'] = $user_file;
        $this->files['system'] = $system_file;
        if ($user_file && @file_exists($user_file)) {
            $this->pushErrorHandling(PEAR_ERROR_RETURN);
            $this->readConfigFile($user_file, 'user', $strict);
            $this->popErrorHandling();
            if ($this->_errorsFound > 0) {
                return;
            }
        }

        if ($system_file && @file_exists($system_file)) {
            $this->mergeConfigFile($system_file, false, 'system', $strict);
            if ($this->_errorsFound > 0) {
                return;
            }

        }

        if (!$ftp_file) {
            $ftp_file = $this->get('remote_config');
        }

        if ($ftp_file && defined('PEAR_REMOTEINSTALL_OK')) {
            $this->readFTPConfigFile($ftp_file);
        }

        foreach ($this->configuration_info as $key => $info) {
            $this->configuration['default'][$key] = $info['default'];
        }

        $this->_registry['default'] = &new PEAR_Registry($this->configuration['default']['php_dir']);
        $this->_registry['default']->setConfig($this);
        $this->_regInitialized['default'] = false;
        //$GLOBALS['_PEAR_Config_instance'] = &$this;
    }

    // }}}
    // {{{ singleton([file], [defaults_file])

    /**
     * Static singleton method.  If you want to keep only one instance
     * of this class in use, this method will give you a reference to
     * the last created PEAR_Config object if one exists, or create a
     * new object.
     *
     * @param string (optional) file to read user-defined options from
     * @param string (optional) file to read system-wide defaults from
     *
     * @return object an existing or new PEAR_Config instance
     *
     * @access public
     *
     * @see PEAR_Config::PEAR_Config
     */
    function &singleton($user_file = '', $system_file = '', $strict = true)
    {
        if (is_object($GLOBALS['_PEAR_Config_instance'])) {
            return $GLOBALS['_PEAR_Config_instance'];
        }

        $t_conf = &new PEAR_Config($user_file, $system_file, false, $strict);
        if ($t_conf->_errorsFound > 0) {
             return $t_conf->lastError;
        }

        $GLOBALS['_PEAR_Config_instance'] = &$t_conf;
        return $GLOBALS['_PEAR_Config_instance'];
    }

    // }}}
    // {{{ validConfiguration()

    /**
     * Determine whether any configuration files have been detected, and whether a
     * registry object can be retrieved from this configuration.
     * @return bool
     * @since PEAR 1.4.0a1
     */
    function validConfiguration()
    {
        if ($this->isDefinedLayer('user') || $this->isDefinedLayer('system')) {
            return true;
        }
        return false;
    }

    // }}}
    // {{{ readConfigFile([file], [layer])

    /**
     * Reads configuration data from a file.  All existing values in
     * the config layer are discarded and replaced with data from the
     * file.
     * @param string file to read from, if NULL or not specified, the
     *               last-used file for the same layer (second param) is used
     * @param string config layer to insert data into ('user' or 'system')
     * @return bool TRUE on success or a PEAR error on failure
     */
    function readConfigFile($file = null, $layer = 'user', $strict = true)
    {
        if (empty($this->files[$layer])) {
            return $this->raiseError("unknown config layer `$layer'");
        }

        if ($file === null) {
            $file = $this->files[$layer];
        }

        $data = $this->_readConfigDataFrom($file);

        if (PEAR::isError($data)) {
            if ($strict) {
                $this->_errorsFound++;
                $this->lastError = $data;

                return $data;
            } else {
                return true;
            }
        } else {
            $this->files[$layer] = $file;
        }

        $this->_decodeInput($data);
        $this->configuration[$layer] = $data;
        $this->_setupChannels();
        if (!$this->_noRegistry && ($phpdir = $this->get('php_dir', $layer, 'pear.php.net'))) {
            $this->_registry[$layer] = &new PEAR_Registry($phpdir);
            $this->_registry[$layer]->setConfig($this);
            $this->_regInitialized[$layer] = false;
        } else {
            unset($this->_registry[$layer]);
        }
        return true;
    }

    // }}}

    /**
     * @param string url to the remote config file, like ftp://www.example.com/pear/config.ini
     * @return true|PEAR_Error
     */
    function readFTPConfigFile($path)
    {
        do { // poor man's try
            if (!class_exists('Net_FTP')) {
                if (!class_exists('PEAR_Common')) {
                    require_once 'PEAR/Common.php';
                }
                if (PEAR_Common::isIncludeable('Net/FTP.php')) {
                    include_once 'Net/FTP.php';
                }
            }
            if (class_exists('Net_FTP') &&
                  (class_exists('PEAR_FTP') || PEAR_Common::isIncludeable('PEAR/FTP.php'))) {
                require_once 'PEAR/FTP.php';
                $this->_ftp = &new PEAR_FTP;
                $this->_ftp->pushErrorHandling(PEAR_ERROR_RETURN);
                $e = $this->_ftp->init($path);
                if (PEAR::isError($e)) {
                    $this->_ftp->popErrorHandling();
                    return $e;
                }
                $tmp = System::mktemp('-d');
                PEAR_Common::addTempFile($tmp);
                $e = $this->_ftp->get(basename($path), $tmp . DIRECTORY_SEPARATOR .
                    'pear.ini', false, FTP_BINARY);
                if (PEAR::isError($e)) {
                    $this->_ftp->popErrorHandling();
                    return $e;
                }
                PEAR_Common::addTempFile($tmp . DIRECTORY_SEPARATOR . 'pear.ini');
                $this->_ftp->disconnect();
                $this->_ftp->popErrorHandling();
                $this->files['ftp'] = $tmp . DIRECTORY_SEPARATOR . 'pear.ini';
                $e = $this->readConfigFile(null, 'ftp');
                if (PEAR::isError($e)) {
                    return $e;
                }
                $fail = array();
                foreach ($this->configuration_info as $key => $val) {
                    if (in_array($this->getGroup($key),
                          array('File Locations', 'File Locations (Advanced)')) &&
                          $this->getType($key) == 'directory') {
                        // any directory configs must be set for this to work
                        if (!isset($this->configuration['ftp'][$key])) {
                            $fail[] = $key;
                        }
                    }
                }
                if (count($fail)) {
                    $fail = '"' . implode('", "', $fail) . '"';
                    unset($this->files['ftp']);
                    unset($this->configuration['ftp']);
                    return PEAR::raiseError('ERROR: Ftp configuration file must set all ' .
                        'directory configuration variables.  These variables were not set: ' .
                        $fail);
                } else {
                    return true;
                }
            } else {
                return PEAR::raiseError('Net_FTP must be installed to use remote config');
            }
        } while (false); // poor man's catch
        unset($this->files['ftp']);
        return PEAR::raiseError('no remote host specified');
    }

    // {{{ _setupChannels()
    
    /**
     * Reads the existing configurations and creates the _channels array from it
     */
    function _setupChannels()
    {
        $set = array_flip(array_values($this->_channels));
        foreach ($this->configuration as $layer => $data) {
            $i = 1000;
            if (isset($data['__channels'])) {
                foreach ($data['__channels'] as $channel => $info) {
                    $set[$channel] = $i++;
                }
            }
        }
        $this->_channels = array_values(array_flip($set));
        $this->setChannels($this->_channels);
    }

    // }}}
    // {{{ deleteChannel(channel)

    function deleteChannel($channel)