<?PHP  //$Id: upgrade.php,v 1.27.2.24 2008/01/29 05:48:07 scyrma Exp $

// This file keeps track of upgrades to Moodle.
//
// Sometimes, changes between versions involve
// alterations to database structures and other
// major things that may break installations.
//
// The upgrade function in this file will attempt
// to perform all the necessary actions to upgrade
// your older installtion to the current version.
//
// If there's something it cannot do itself, it
// will tell you what you need to do.
//
// The commands in here will all be database-neutral,
// using the functions defined in lib/ddllib.php


function xmldb_main_upgrade($oldversion=0) {

    global $CFG, $THEME, $USER, $db;

    $result = true;

    if ($oldversion < 2006100401) {
        /// Only for those tracking Moodle 1.7 dev, others will have these dropped in moodle_install_roles()
        if (!empty($CFG->rolesactive)) {
            drop_table(new XMLDBTable('user_students'));
            drop_table(new XMLDBTable('user_teachers'));
            drop_table(new XMLDBTable('user_coursecreators'));
            drop_table(new XMLDBTable('user_admins'));
        }
    }

    if ($oldversion < 2006100601) {         /// Disable the exercise module because it's unmaintained
        if ($module = get_record('modules', 'name', 'exercise')) {
            if ($module->visible) {
                // Hide/disable the module entry
                set_field('modules', 'visible', '0', 'id', $module->id); 
                // Save existing visible state for all activities
                set_field('course_modules', 'visibleold', '1', 'visible' ,'1', 'module', $module->id);
                set_field('course_modules', 'visibleold', '0', 'visible' ,'0', 'module', $module->id);
                // Hide all activities
                set_field('course_modules', 'visible', '0', 'module', $module->id);
    
                require_once($CFG->dirroot.'/course/lib.php');
                rebuild_course_cache();  // Rebuld cache for all modules because they might have changed
            }
        }
    }

    if ($oldversion < 2006101001) {         /// Disable the LAMS module by default (if it is installed)
        if (count_records('modules', 'name', 'lams') && !count_records('lams')) {
            set_field('modules', 'visible', 0, 'name', 'lams');  // Disable it by default
        }
    }
    
    if ($result && $oldversion < 2006102600) {

        /// Define fields to be added to user_info_field
        $table  = new XMLDBTable('user_info_field');
        $field = new XMLDBField('description');
        $field->setAttributes(XMLDB_TYPE_TEXT, 'big', null, null, null, null, null, null, 'categoryid');
        $field1 = new XMLDBField('param1');
        $field1->setAttributes(XMLDB_TYPE_TEXT, 'big', null, null, null, null, null, null, 'defaultdata');
        $field2 = new XMLDBField('param2');
        $field2->setAttributes(XMLDB_TYPE_TEXT, 'big', null, null, null, null, null, null, 'param1');
        $field3 = new XMLDBField('param3');
        $field3->setAttributes(XMLDB_TYPE_TEXT, 'big', null, null, null, null, null, null, 'param2');
        $field4 = new XMLDBField('param4');
        $field4->setAttributes(XMLDB_TYPE_TEXT, 'big', null, null, null, null, null, null, 'param3');
        $field5 = new XMLDBField('param5');
        $field5->setAttributes(XMLDB_TYPE_TEXT, 'big', null, null, null, null, null, null, 'param4');

        /// Launch add fields
        $result = $result && add_field($table, $field);
        $result = $result && add_field($table, $field1);
        $result = $result && add_field($table, $field2);
        $result = $result && add_field($table, $field3);
        $result = $result && add_field($table, $field4);
        $result = $result && add_field($table, $field5);
    }
    
    if ($result && $oldversion < 2006112000) {

    /// Define field attachment to be added to post
        $table = new XMLDBTable('post');
        $field = new XMLDBField('attachment');
        $field->setAttributes(XMLDB_TYPE_CHAR, '100', null, null, null, null, null, null, 'format');

    /// Launch add field attachment
        $result = $result && add_field($table, $field);
    }
    
    if ($result && $oldversion < 2006112200) {

    /// Define field imagealt to be added to user
        $table = new XMLDBTable('user');
        $field = new XMLDBField('imagealt');
        $field->setAttributes(XMLDB_TYPE_CHAR, '255', null, null, null, null, null, null, 'trustbitmask');

    /// Launch add field imagealt
        $result = $result && add_field($table, $field);
        
        $table = new XMLDBTable('user');
        $field = new XMLDBField('screenreader');
        $field->setAttributes(XMLDB_TYPE_INTEGER, '1', null, XMLDB_NOTNULL, null, null, null, '0', 'imagealt');

    /// Launch add field screenreader
        $result = $result && add_field($table, $field);
    }

    if ($oldversion < 2006120300) {    /// Delete guest course section settings
        // following code can be executed repeatedly, such as when upgrading from 1.7.x - it is ok
        if ($guest = get_record('user', 'username', 'guest')) {
            execute_sql("DELETE FROM {$CFG->prefix}course_display where userid=$guest->id", true);
        }
    }

    if ($oldversion < 2006120400) {    /// Remove secureforms config setting
        execute_sql("DELETE FROM {$CFG->prefix}config where name='secureforms'", true);
    }
    
    if ($oldversion < 2006120700) { // add moodle/user:viewdetails to all roles!
        if ($roles = get_records('role')) {
            $context = get_context_instance(CONTEXT_SYSTEM);
            foreach ($roles as $roleid=>$role) {
                assign_capability('moodle/user:viewdetails', CAP_ALLOW, $roleid, $context->id);
            }
        }
    }

    // Move the auth plugin settings into the config_plugin table
    if ($oldversion < 2007010300) {
        if ($CFG->auth == 'email') {
            set_config('registerauth', 'email');
        } else {
            set_config('registerauth', '');
        }
        $authplugins = get_list_of_plugins('auth');
        foreach ($CFG as $k => $v) {
            if (strpos($k, 'ldap_') === 0) {
                //upgrade nonstandard ldap settings
                $setting = substr($k, 5);
                if (set_config($setting, $v, "auth/ldap")) {
                    delete_records('config', 'name', $k);
                    unset($CFG->{$k});
                }
                continue;
            }
            if (strpos($k, 'auth_') !== 0) {
                continue;
            }
            $authsetting = substr($k, 5);
            foreach ($authplugins as $auth) {
                if (strpos($authsetting, $auth) !== 0) {
                    continue;
                }
                $setting = substr($authsetting, strlen($auth));
                if (set_config($setting, $v, "auth/$auth")) {
                    delete_records('config', 'name', $k);
                    unset($CFG->{$k});
                }
                break; // don't check the rest of the auth plugin names
            }
        }
    }

    if ($oldversion < 2007010301) {
        //
        // Core MNET tables
        //
        $table = new XMLDBTable('mnet_host');
        $table->comment = 'Information about the local and remote hosts for RPC';
        // fields
        $f = $table->addFieldInfo('id',                 XMLDB_TYPE_INTEGER,  '10', false,
                                  XMLDB_NOTNULL, XMLDB_SEQUENCE, null, null, null);
        $f->comment = 'Unique Host ID';
        $f = $table->addFieldInfo('deleted',            XMLDB_TYPE_INTEGER,  '1', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, null, null, null, 0);
        $f = $table->addFieldInfo('wwwroot',            XMLDB_TYPE_CHAR,   '255', null,
                                  XMLDB_NOTNULL, null, null, null, null);
        $f = $table->addFieldInfo('ip_address',         XMLDB_TYPE_CHAR,    '39', null,
                                  XMLDB_NOTNULL, null, null, null, null);
        $f = $table->addFieldInfo('name',               XMLDB_TYPE_CHAR,    '80', null,
                                  XMLDB_NOTNULL, null, null, null, null);
        $f = $table->addFieldInfo('public_key',         XMLDB_TYPE_TEXT, 'medium', null,
                                  XMLDB_NOTNULL, null, null, null, null);
        $f = $table->addFieldInfo('public_key_expires', XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, null, null, null, 0);
        $f = $table->addFieldInfo('transport',          XMLDB_TYPE_INTEGER,  '2', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, null, null, null, 0);
        $f = $table->addFieldInfo('portno',             XMLDB_TYPE_INTEGER,  '2', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, null, null, null, 0);
        $f = $table->addFieldInfo('last_connect_time',  XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, null, null, null, 0);
        $f = $table->addFieldInfo('last_log_id',  XMLDB_TYPE_INTEGER, '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, null, null, null, 0);
        // PK and indexes 
        $table->addKeyInfo('primary', XMLDB_KEY_PRIMARY, array('id'));
        // Create the table
        $result = $result && create_table($table);

        $table = new XMLDBTable('mnet_host2service');
        $table->comment = 'Information about the services for a given host';
        // fields
        $f = $table->addFieldInfo('id',        XMLDB_TYPE_INTEGER,  '10', false,
                                  XMLDB_NOTNULL, XMLDB_SEQUENCE, null, null, null);
        $f = $table->addFieldInfo('hostid',    XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('serviceid', XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('publish', XMLDB_TYPE_INTEGER,  '1', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('subscribe', XMLDB_TYPE_INTEGER,  '1', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        // PK and indexes
        $table->addKeyInfo('primary', XMLDB_KEY_PRIMARY, array('id'));
        $table->addIndexInfo('hostid_serviceid', XMLDB_INDEX_UNIQUE, array('hostid', 'serviceid'));
        // Create the table
        $result = $result && create_table($table);

        $table = new XMLDBTable('mnet_log');
        $table->comment = 'Store session data from users migrating to other sites';
        // fields
        $f = $table->addFieldInfo('id',        XMLDB_TYPE_INTEGER,  '10', false,
                                  XMLDB_NOTNULL, XMLDB_SEQUENCE, null, null, null);
        $f = $table->addFieldInfo('hostid',    XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('remoteid',    XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('time',    XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('userid',    XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('ip',    XMLDB_TYPE_CHAR,  '15', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('course',    XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('coursename',    XMLDB_TYPE_CHAR,  '40', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('module',    XMLDB_TYPE_CHAR,  '20', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('cmid',    XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('action',    XMLDB_TYPE_CHAR,  '40', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('url',    XMLDB_TYPE_CHAR,  '100', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('info',    XMLDB_TYPE_CHAR,  '255', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        // PK and indexes
        $table->addKeyInfo('primary', XMLDB_KEY_PRIMARY, array('id'));
        $table->addIndexInfo('host_user_course', XMLDB_INDEX_NOTUNIQUE, array('hostid', 'userid', 'course'));
        // Create the table
        $result = $result && create_table($table);


        $table = new XMLDBTable('mnet_rpc');
        $table->comment = 'Functions or methods that we may publish or subscribe to';
        // fields
        $f = $table->addFieldInfo('id',        XMLDB_TYPE_INTEGER,  '10', false,
                                  XMLDB_NOTNULL, XMLDB_SEQUENCE, null, null, null);
        $f = $table->addFieldInfo('function_name',    XMLDB_TYPE_CHAR,  '40', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('xmlrpc_path',    XMLDB_TYPE_CHAR,  '80', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('parent_type',    XMLDB_TYPE_CHAR,  '6', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('parent',    XMLDB_TYPE_CHAR,  '20', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('enabled', XMLDB_TYPE_INTEGER,  '1', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('help',    XMLDB_TYPE_TEXT,  'medium', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('profile',    XMLDB_TYPE_TEXT,  'medium', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        // PK and indexes
        $table->addKeyInfo('primary', XMLDB_KEY_PRIMARY, array('id'));
        $table->addIndexInfo('enabled_xpath', XMLDB_INDEX_NOTUNIQUE, array('enabled', 'xmlrpc_path'));
        // Create the table
        $result = $result && create_table($table);

        $table = new XMLDBTable('mnet_service');
        $table->comment = 'A service is a group of functions';
        // fields
        $f = $table->addFieldInfo('id',        XMLDB_TYPE_INTEGER,  '10', false,
                                  XMLDB_NOTNULL, XMLDB_SEQUENCE, null, null, null);
        $f = $table->addFieldInfo('name',    XMLDB_TYPE_CHAR,  '40', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('description',    XMLDB_TYPE_CHAR,  '40', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('apiversion',    XMLDB_TYPE_CHAR,  '10', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('offer',    XMLDB_TYPE_INTEGER,  '1', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        // PK and indexes
        $table->addKeyInfo('primary', XMLDB_KEY_PRIMARY, array('id'));
        // Create the table
        $result = $result && create_table($table);

        $table = new XMLDBTable('mnet_service2rpc');
        $table->comment = 'Group functions or methods under a service';
        // fields
        $f = $table->addFieldInfo('id',        XMLDB_TYPE_INTEGER,  '10', false,
                                  XMLDB_NOTNULL, XMLDB_SEQUENCE, null, null, null);
        $f = $table->addFieldInfo('serviceid', XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('rpcid',    XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        // PK and indexes
        $table->addKeyInfo('primary', XMLDB_KEY_PRIMARY, array('id'));
        $table->addIndexInfo('unique', XMLDB_INDEX_UNIQUE, array('rpcid', 'serviceid'));
        // Create the table
        $result = $result && create_table($table);

        //
        // Prime MNET configuration entries -- will be needed later by auth/mnet 
        //
        include_once $CFG->dirroot . '/mnet/lib.php';
        $env = new mnet_environment();
        $env->init();
        unset($env);

        // add mnethostid to user-        
        $table = new XMLDBTable('user');
        $field = new XMLDBField('mnethostid');
        $field->setType(XMLDB_TYPE_INTEGER);
        $field->setLength(10);
        $field->setNotNull(true);
        $field->setSequence(null);
        $field->setEnum(null);
        $field->setDefault('0');
        $field->setPrevious("deleted");
        $field->setNext("username");
        $result = $result && add_field($table, $field);

        // The default mnethostid is zero... we need to update this for all
        // users of the local IdP service.
        set_field('user', 
                  'mnethostid', $CFG->mnet_localhost_id, 
                  'mnethostid', '0');


        $index = new XMLDBIndex('username');
        $index->setUnique(true);
        $index->setFields(array('username'));
        drop_index($table, $index);
        $index->setFields(array('mnethostid', 'username'));
        if (!add_index($table, $index)) {
            notify(get_string('duplicate_usernames', 'mnet', 'http://docs.moodle.org/en/DuplicateUsernames'));
        }

        unset($table, $field, $index);        

        /**
         ** auth/mnet tables
         **/
        $table = new XMLDBTable('mnet_session');
        $table->comment='Store session data from users migrating to other sites';
        // fields
        $f = $table->addFieldInfo('id',         XMLDB_TYPE_INTEGER,  '10', false,
                                  XMLDB_NOTNULL,XMLDB_SEQUENCE, null, null, null);
        $f = $table->addFieldInfo('userid', XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('username',   XMLDB_TYPE_CHAR,  '100', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('token',      XMLDB_TYPE_CHAR,  '40', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('mnethostid', XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('useragent',  XMLDB_TYPE_CHAR,  '40', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('confirm_timeout', XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('session_id',   XMLDB_TYPE_CHAR,  '40', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('expires', XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        // PK and indexes
        $table->addKeyInfo('primary', XMLDB_KEY_PRIMARY, array('id'));
        $table->addIndexInfo('token', XMLDB_INDEX_UNIQUE, array('token'));
        // Create the table
        $result = $result && create_table($table);


        $table = new XMLDBTable('mnet_sso_access_control');
        $table->comment = 'Users by host permitted (or not) to login from a remote provider';
        $f = $table->addFieldInfo('id',         XMLDB_TYPE_INTEGER,  '10', false,
                                  XMLDB_NOTNULL,XMLDB_SEQUENCE, null, null, null);
        $f = $table->addFieldInfo('username',   XMLDB_TYPE_CHAR,  '100', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('mnet_host_id', XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('access',  XMLDB_TYPE_CHAR,  '20', null,
                                  XMLDB_NOTNULL, NULL, null, null, 'allow');
        // PK and indexes
        $table->addKeyInfo('primary', XMLDB_KEY_PRIMARY, array('id'));
        $table->addIndexInfo('mnethostid_username', XMLDB_INDEX_UNIQUE, array('mnet_host_id', 'username'));
        // Create the table
        $result = $result && create_table($table);

        if (empty($USER->mnet_host_id)) {
            $USER->mnet_host_id = $CFG->mnet_localhost_id;    // Something for the current user to prevent warnings
        }

        /**
         ** enrol/mnet tables
         **/
        $table = new XMLDBTable('mnet_enrol_course');
        $table->comment = 'Information about courses on remote hosts';
        $f = $table->addFieldInfo('id',         XMLDB_TYPE_INTEGER,  '10', false,
                                  XMLDB_NOTNULL,XMLDB_SEQUENCE, null, null, null);
        $f = $table->addFieldInfo('hostid', XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('remoteid', XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                          XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('cat_id', XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('cat_name',  XMLDB_TYPE_CHAR,  '255', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('cat_description',  XMLDB_TYPE_TEXT,  'medium', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('sortorder', XMLDB_TYPE_INTEGER,  '4', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('fullname',  XMLDB_TYPE_CHAR,  '254', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('shortname',  XMLDB_TYPE_CHAR,  '15', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('idnumber',  XMLDB_TYPE_CHAR,  '100', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('summary',  XMLDB_TYPE_TEXT,  'medium', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('startdate', XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('cost',  XMLDB_TYPE_CHAR,  '10', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('currency',  XMLDB_TYPE_CHAR,  '3', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('defaultroleid', XMLDB_TYPE_INTEGER,  '4', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('defaultrolename',  XMLDB_TYPE_CHAR,  '255', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        // PK and indexes
        $table->addKeyInfo('primary', XMLDB_KEY_PRIMARY, array('id'));
        $table->addIndexInfo('hostid_remoteid', XMLDB_INDEX_UNIQUE, array('hostid', 'remoteid'));
        // Create the table
        $result = $result && create_table($table);


        $table = new XMLDBTable('mnet_enrol_assignments');

        $table->comment = 'Information about enrolments on courses on remote hosts';
        $f = $table->addFieldInfo('id',         XMLDB_TYPE_INTEGER,  '10', false,
                                  XMLDB_NOTNULL,XMLDB_SEQUENCE, null, null, null);
        $f = $table->addFieldInfo('userid', XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('hostid', XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0); 
        $f = $table->addFieldInfo('courseid', XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('rolename',  XMLDB_TYPE_CHAR,  '255', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);
        $f = $table->addFieldInfo('enroltime', XMLDB_TYPE_INTEGER,  '10', XMLDB_UNSIGNED,
                                  XMLDB_NOTNULL, NULL, null, null, 0);
        $f = $table->addFieldInfo('enroltype',  XMLDB_TYPE_CHAR,  '20', null,
                                  XMLDB_NOTNULL, NULL, null, null, null);

        // PK and indexes
        $table->addKeyInfo('primary', XMLDB_KEY_PRIMARY, array('id'));
        $table->addIndexInfo('hostid_courseid', XMLDB_INDEX_NOTUNIQUE, array('hostid', 'courseid'));
        $table->addIndexInfo('userid', XMLDB_INDEX_NOTUNIQUE, array('userid'));
        // Create the table
        $result = $result && create_table($table);

    }

    if ($result && $oldversion < 2007010404) {

        /// Define field shortname to be added to user_info_field
        $table = new XMLDBTable('user_info_field');
        $field = new XMLDBField('shortname');
        $field->setAttributes(XMLDB_TYPE_CHAR, '255', null, XMLDB_NOTNULL, null, null, null, 'shortname', 'id');

        /// Launch add field shortname
        $result = $result && add_field($table, $field);

        /// Changing type of field name on table user_info_field to text
        $table = new XMLDBTable('user_info_field');
        $field = new XMLDBField('name');
        $field->setAttributes(XMLDB_TYPE_TEXT, 'big', null, XMLDB_NOTNULL, null, null, null, null, 'shortname');

        /// Launch change of type for field name
        $result = $result && change_field_type($table, $field);

        /// For existing fields use 'name' as the 'shortname' entry
        if ($fields = get_records_select('user_info_field', '', '', 'id, name')) {
            foreach ($fields as $field) {
                $field->shortname = clean_param($field->name, PARAM_ALPHANUM);
                $result && update_record('user_info_field', $field);
            }
        }
    }

    if ($result && $oldversion < 2007011200) {

    /// Define table context_rel to be created
        $table = new XMLDBTable('context_rel');

    /// Adding fields to table context_rel
        $table->addFieldInfo('id', XMLDB_TYPE_INTEGER, '10', null, XMLDB_NOTNULL, XMLDB_SEQUENCE, null, null, null);
        $table->addFieldInfo('c1', XMLDB_TYPE_INTEGER, '10', null, null, null, null, null, null);
        $table->addFieldInfo('c2', XMLDB_TYPE_INTEGER, '10', null, null, null, null, null, null);

    /// Adding keys to table context_rel
        $table->addKeyInfo('primary', XMLDB_KEY_PRIMARY, array('id'));
        $table->addKeyInfo('c1', XMLDB_KEY_FOREIGN, array('c1'), 'context', array('id'));
        $table->addKeyInfo('c2', XMLDB_KEY_FOREIGN, array('c2'), 'context', array('id'));
        $table->addKeyInfo('c1c2', XMLDB_KEY_UNIQUE, array('c1', 'c2'));

    /// Launch create table for context_rel
        $result = $result && create_table($table);
        
        /// code here to fill the context_rel table
        /// use get record set to iterate slower
        build_context_rel();
    }

    if ($result && $oldversion < 2007011501) {
        if (!empty($CFG->enablerecordcache) && empty($CFG->rcache) && 
            // Note: won't force-load these settings into CFG
            // we don't need or want cache during the upgrade itself
            empty($CFG->cachetype) && empty($CFG->intcachemax)) {
            set_config('cachetype',   'internal');
            set_config('rcache',      true);
            set_config('intcachemax', $CFG->enablerecordcache);
            unset_config('enablerecordcache');
            unset($CFG->enablerecordcache);
        }
    }

    if ($result && $oldversion < 2007012100) {
    /// Some old PG servers have user->firstname & user->lastname with 30cc. They must be 100cc.
    /// Fixing that conditionally. MDL-7110
        if ($CFG->dbfamily == 'postgres') {
        /// Get Metadata from user table
            $cols = array_change_key_case($db->MetaColumns($CFG->prefix . 'user'), CASE_LOWER);

        /// Process user->firstname if needed
            if ($col = $cols['firstname']) {
                if ($col->max_length < 100) {
                /// Changing precision of field firstname on table user to (100)
                    $table = new XMLDBTable('user');
                    $field = new XMLDBField('firstname');
                    $field->setAttributes(XMLDB_TYPE_CHAR, '100', null, XMLDB_NOTNULL, null, null, null, null, 'idnumber');

                /// Launch change of precision for field firstname
                    $result = $result && change_field_precision($table, $field);
                }
            }

        /// Process user->lastname if needed
            if ($col = $cols['lastname']) {
                if ($col->max_length < 100) {
                /// Changing precision of field lastname on table user to (100)
                    $table = new XMLDBTable('user');
                    $field = new XMLDBField('lastname');
                    $field->setAttributes(XMLDB_TYPE_CHAR, '100', null, XMLDB_NOTNULL, null, null, null, null, 'firstname');

                /// Launch change of precision for field lastname
                    $result = $result && change_field_precision($table, $field);
                }
            }
        }
    }

    if ($result && $oldversion < 2007012101) {

    /// Changing precision of field lang on table course to (30)
        $table = new XMLDBTable('course');
        $field = new XMLDBField('lang');
        $field->setAttributes(XMLDB_TYPE_CHAR, '30', null, XMLDB_NOTNULL, null, null, null, null, 'groupmodeforce');

    /// Launch change of precision for field course->lang
        $result = $result && change_field_precision($table, $field);

    /// Changing precision of field lang on table user to (30)
        $table = new XMLDBTable('user');
        $field = new XMLDBField('lang');
        $field->setAttributes(XMLDB_TYPE_CHAR, '30', null, XMLDB_NOTNULL, null, null, null, 'en', 'country');

    /// Launch change of precision for field user->lang
        $result = $result && change_field_precision($table, $field);
    }

    if ($result && $oldversion < 2007012400) {

    /// Rename field access on table mnet_sso_access_control to accessctrl
        $table = new XMLDBTable('mnet_sso_access_control');
        $field = new XMLDBField('access');
        $field->setAttributes(XMLDB_TYPE_CHAR, '20', null, XMLDB_NOTNULL, null, null, null, 'allow', 'mnet_host_id');

    /// Launch rename field accessctrl
        $result = $result && rename_field($table, $field, 'accessctrl');
    }

    if ($result && $oldversion < 2007012500) {
        execute_sql("DELETE FROM {$CFG->prefix}user WHERE username='changeme'", true);
    }

    if ($result && $oldversion < 2007020400) {
    /// Only for MySQL and PG, declare the user->ajax field as not null. MDL-8421.
        if ($CFG->dbfamily == 'mysql' || $CFG->dbfamily == 'postgres') {
        /// Changing nullability of field ajax on table user to not null
            $table = new XMLDBTable('user');
            $field = new XMLDBField('ajax');
            $field->setAttributes(XMLDB_TYPE_INTEGER, '1', XMLDB_UNSIGNED, XMLDB_NOTNULL, null, null, null, '1', 'htmleditor');

        /// Launch change of nullability for field ajax
            $result = $result && change_field_notnull($table, $field);
        }
    }

    if (!empty($CFG->rolesactive) && $result && $oldversion < 2007021401) {
    /// create default logged in user role if not present - upgrade rom 1.7.x
        if (empty($CFG->defaultuserroleid) or empty($CFG->guestroleid) or $CFG->defaultuserroleid == $CFG->guestroleid) {
            if (!get_records('role', 'shortname', 'user')) {
                $userroleid = create_role(addslashes(get_string('authenticateduser')), 'user',
                                          addslashes(get_string('authenticateduserdescription')), 'moodle/legacy:user');
                if ($userroleid) {
                    reset_role_capabilities($userroleid);
                    set_config('defaultuserroleid', $userroleid);
                }
            }
        }
    }

    if ($result && $oldversion < 2007021501) {
    /// delete removed setting from config
        unset_config('tabselectedtofront');
    }

    /* Changes to the custom profile menu type - store values rather than indices.
       We could do all this with one tricky SQL statement but it's a one-off so no
       harm in using PHP loops */
    if ($result && $oldversion < 2007021503) {

    /// Get the menu fields
        if ($fields = get_records('user_info_field', 'datatype', 'menu')) {
            foreach ($fields as $field) {

            /// Get user data for the menu field
                if ($data = get_records('user_info_data', 'fieldid', $field->id)) {

                /// Get the menu options
                    $options = explode("\n", $field->param1);
                    foreach ($data as $d) {
                        $key = array_search($d->data, $options);

                    /// If the data is an integer and is not one of the options,
                    /// set the respective option value
                        if (is_int($d->data) and (($key === NULL) or ($key === false)) and isset($options[$d->data])) {
                                $d->data = $options[$d->data];
                                $result = $result && update_record('user_info_data', $d);
                        }
                    }
                }
            }
        }

    }

    if ($result && $oldversion < 2007021504) {
        if (empty($CFG->enablegroupings) and !empty($CFG->group_version)) {
            // delete all groupings - they do not work yet :-(
            // while keeping all existing groups
            require_once("$CFG->dirroot/group/db/upgrade.php");
            undo_groupings();
        }
    }

    if ($result && $oldversion < 2007021505) {
        //  Get the role id of the "Auth. User" role and check if the default role id is different
        $userrole = get_record( 'role', 'shortname', 'user' );
        $defaultroleid = $CFG->defaultuserroleid;

        if( $defaultroleid != $userrole->id ) {
            //  Add in the new moodle/my:manageblocks capibility to the default user role
            $context = get_context_instance(CONTEXT_SYSTEM, SITEID);
            assign_capability('moodle/my:manageblocks',CAP_ALLOW,$defaultroleid,$context->id);
        }
    }

    if ($result && $oldversion < 2007021511) {
        // Small update of guest user to be 100% sure it has the correct mnethostid (MDL-10375)
        set_field('user', 'mnethostid', $CFG->mnet_localhost_id, 'username', 'guest');
    }

    if ($result && $oldversion < 2007021532) {
        // Get list of users by browsing moodledata/user
        $oldusersdir = $CFG->dataroot . '/users';
        $folders = get_directory_list($oldusersdir, '', false, true, false);

        foreach ($folders as $userid) {
            $olddir = $oldusersdir . '/' . $userid;
            $files = get_directory_list($olddir);

            if (empty($files)) {
                continue;
            }

            // Create new user directory
            if (!$newdir = make_user_directory($userid)) {
                $result = false;
                break;
            }

            // Move contents of old directory to new one
            if (file_exists($olddir) && file_exists($newdir)) {
                foreach ($files as $file) {
                    copy($olddir . '/' . $file, $newdir . '/' . $file);
                }
            } else {
                notify("Could not move the contents of $olddir into $newdir!");
                $result = false;
                break;
            }
        }

        // Leave a README in old users directory
        $readmefilename = $oldusersdir . '/README.txt';
        if ($handle = fopen($readmefilename, 'w+b')) {
            if (!fwrite($handle, get_string('olduserdirectory'))) {
                // Could not write to the readme file. No cause for huge concern
                notify("Could not write to the README.txt file in $readmefilename.");
            }
            fclose($handle);
        } else {
            // Could not create the readme file. No cause for huge concern
            notify("Could not create the README.txt file in $readmefilename.");
        }
    }

    if ($result && $oldversion < 2007021534) {

    /// Changing precision of field dst_time on table timezone to (6)
        $table = new XMLDBTable('timezone');
        $field = new XMLDBField('dst_time');
        $field->setAttributes(XMLDB_TYPE_CHAR, '6', null, XMLDB_NOTNULL, null, null, null, '00:00', 'dst_skipweeks');

    /// Launch change of precision for field dst_time
        $result = $result && change_field_precision($table, $field);

    /// Changing precision of field std_time on table timezone to (6)
        $table = new XMLDBTable('timezone');
        $field = new XMLDBField('std_time');
        $field->setAttributes(XMLDB_TYPE_CHAR, '6', null, XMLDB_NOTNULL, null, null, null, '00:00', 'std_skipweeks');

    /// Launch change of precision for field std_time
        $result = $result && change_field_precision($table, $field);
    }

    if ($result && $oldversion < 2007021541) {
        $db->debug = false;
        notify('Updating country list according to recent official ISO listing...', 'notifysuccess');
        // re-assign users to valid countries
        set_field('user', 'country', 'CD', 'country', 'ZR'); // Zaire is now Congo Democratique
        set_field('user', 'country', 'TL', 'country', 'TP'); // Timor has changed
        set_field('user', 'country', 'FR', 'country', 'FX'); // France metropolitaine doesn't exist
        set_field('user', 'country', 'RS', 'country', 'KO'); // Kosovo is part of Serbia, "under the auspices of the United Nations, pursuant to UN Security Council Resolution 1244 of 10 June 1999."
        set_field('user', 'country', 'GB', 'country', 'WA'); // Wales is part of UK (ie Great Britain)
        set_field('user', 'country', 'RS', 'country', 'CS'); // Re-assign Serbia-Montenegro to Serbia.  This is arbitrary, but there is no way to make an automatic decision on this.
        notify('...update complete. Remember to update your language packs to get the most recent country names definitions and codes.  This is especially important for sites with users from Congo (now CD), Timor (now TL), Kosovo (now RS), Wales (now GB), Serbia (RS) and Montenegro (ME).  Users based in Montenegro (ME) will need to manually update their profile.', 'notifysuccess');
        $db->debug = true;
    }

    return $result;

}
?>
