repo MDL-21443 fix phpdocs to match method signatures
[moodle.git] / lib / upgradelib.php
CommitLineData
96db14f9 1<?php
2
3// This file is part of Moodle - http://moodle.org/
4//
5// Moodle is free software: you can redistribute it and/or modify
6// it under the terms of the GNU General Public License as published by
7// the Free Software Foundation, either version 3 of the License, or
8// (at your option) any later version.
9//
10// Moodle is distributed in the hope that it will be useful,
11// but WITHOUT ANY WARRANTY; without even the implied warranty of
12// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13// GNU General Public License for more details.
14//
15// You should have received a copy of the GNU General Public License
16// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
db9d4a3d 17
18/**
8580535b 19 * Various upgrade/install related functions and classes.
db9d4a3d 20 *
96db14f9 21 * @package moodlecore
22 * @subpackage upgrade
23 * @copyright 1999 onwards Martin Dougiamas (http://dougiamas.com)
24 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
db9d4a3d 25 */
26
72fb21b6 27/** UPGRADE_LOG_NORMAL = 0 */
db9d4a3d 28define('UPGRADE_LOG_NORMAL', 0);
72fb21b6 29/** UPGRADE_LOG_NOTICE = 1 */
db9d4a3d 30define('UPGRADE_LOG_NOTICE', 1);
72fb21b6 31/** UPGRADE_LOG_ERROR = 2 */
795a08ad 32define('UPGRADE_LOG_ERROR', 2);
33
34/**
35 * Exception indicating unknown error during upgrade.
72fb21b6 36 *
37 * @package moodlecore
38 * @subpackage upgrade
39 * @copyright 1999 onwards Martin Dougiamas (http://dougiamas.com)
40 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
795a08ad 41 */
42class upgrade_exception extends moodle_exception {
43 function __construct($plugin, $version) {
44 global $CFG;
45 $a = (object)array('plugin'=>$plugin, 'version'=>$version);
45440ceb 46 parent::__construct('upgradeerror', 'admin', "$CFG->wwwroot/$CFG->admin/index.php", $a);
795a08ad 47 }
48}
49
50/**
51 * Exception indicating downgrade error during upgrade.
72fb21b6 52 *
53 * @package moodlecore
54 * @subpackage upgrade
55 * @copyright 1999 onwards Martin Dougiamas (http://dougiamas.com)
56 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
795a08ad 57 */
58class downgrade_exception extends moodle_exception {
59 function __construct($plugin, $oldversion, $newversion) {
60 global $CFG;
61 $plugin = is_null($plugin) ? 'moodle' : $plugin;
62 $a = (object)array('plugin'=>$plugin, 'oldversion'=>$oldversion, 'newversion'=>$newversion);
63 parent::__construct('cannotdowngrade', 'debug', "$CFG->wwwroot/$CFG->admin/index.php", $a);
64 }
65}
66
72fb21b6 67/**
68 * @package moodlecore
69 * @subpackage upgrade
70 * @copyright 1999 onwards Martin Dougiamas (http://dougiamas.com)
71 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
72 */
795a08ad 73class upgrade_requires_exception extends moodle_exception {
74 function __construct($plugin, $pluginversion, $currentmoodle, $requiremoodle) {
75 global $CFG;
76 $a = new object();
77 $a->pluginname = $plugin;
78 $a->pluginversion = $pluginversion;
79 $a->currentmoodle = $currentmoodle;
17da2e6f 80 $a->requiremoodle = $requiremoodle;
795a08ad 81 parent::__construct('pluginrequirementsnotmet', 'error', "$CFG->wwwroot/$CFG->admin/index.php", $a);
82 }
83}
84
72fb21b6 85/**
86 * @package moodlecore
87 * @subpackage upgrade
88 * @copyright 1999 onwards Martin Dougiamas (http://dougiamas.com)
89 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
90 */
795a08ad 91class plugin_defective_exception extends moodle_exception {
92 function __construct($plugin, $details) {
93 global $CFG;
94 parent::__construct('detectedbrokenplugin', 'error', "$CFG->wwwroot/$CFG->admin/index.php", $plugin, $details);
95 }
96}
db9d4a3d 97
98/**
99 * Insert or update log display entry. Entry may already exist.
100 * $module, $action must be unique
101 *
72fb21b6 102 * @global object
db9d4a3d 103 * @param string $module
104 * @param string $action
105 * @param string $mtable
106 * @param string $field
107 * @return void
108 *
109 */
110function update_log_display_entry($module, $action, $mtable, $field) {
111 global $DB;
112
113 if ($type = $DB->get_record('log_display', array('module'=>$module, 'action'=>$action))) {
114 $type->mtable = $mtable;
115 $type->field = $field;
116 $DB->update_record('log_display', $type);
117
118 } else {
119 $type = new object();
120 $type->module = $module;
121 $type->action = $action;
122 $type->mtable = $mtable;
123 $type->field = $field;
124
125 $DB->insert_record('log_display', $type, false);
126 }
127}
128
129/**
130 * Upgrade savepoint, marks end of each upgrade block.
131 * It stores new main version, resets upgrade timeout
132 * and abort upgrade if user cancels page loading.
133 *
134 * Please do not make large upgrade blocks with lots of operations,
135 * for example when adding tables keep only one table operation per block.
136 *
72fb21b6 137 * @global object
db9d4a3d 138 * @param bool $result false if upgrade step failed, true if completed
139 * @param string or float $version main version
140 * @param bool $allowabort allow user to abort script execution here
141 * @return void
142 */
143function upgrade_main_savepoint($result, $version, $allowabort=true) {
144 global $CFG;
145
795a08ad 146 if (!$result) {
520cea92 147 throw new upgrade_exception(null, $version);
795a08ad 148 }
149
150 if ($CFG->version >= $version) {
151 // something really wrong is going on in main upgrade script
152 throw new downgrade_exception(null, $CFG->version, $version);
db9d4a3d 153 }
154
795a08ad 155 set_config('version', $version);
156 upgrade_log(UPGRADE_LOG_NORMAL, null, 'Upgrade savepoint reached');
157
db9d4a3d 158 // reset upgrade timeout to default
159 upgrade_set_timeout();
160
161 // this is a safe place to stop upgrades if user aborts page loading
162 if ($allowabort and connection_aborted()) {
163 die;
164 }
165}
166
167/**
168 * Module upgrade savepoint, marks end of module upgrade blocks
169 * It stores module version, resets upgrade timeout
170 * and abort upgrade if user cancels page loading.
171 *
72fb21b6 172 * @global object
db9d4a3d 173 * @param bool $result false if upgrade step failed, true if completed
174 * @param string or float $version main version
175 * @param string $modname name of module
176 * @param bool $allowabort allow user to abort script execution here
177 * @return void
178 */
179function upgrade_mod_savepoint($result, $version, $modname, $allowabort=true) {
180 global $DB;
181
795a08ad 182 if (!$result) {
520cea92 183 throw new upgrade_exception("mod_$modname", $version);
795a08ad 184 }
185
db9d4a3d 186 if (!$module = $DB->get_record('modules', array('name'=>$modname))) {
187 print_error('modulenotexist', 'debug', '', $modname);
188 }
189
795a08ad 190 if ($module->version >= $version) {
191 // something really wrong is going on in upgrade script
520cea92 192 throw new downgrade_exception("mod_$modname", $module->version, $version);
db9d4a3d 193 }
795a08ad 194 $module->version = $version;
195 $DB->update_record('modules', $module);
520cea92 196 upgrade_log(UPGRADE_LOG_NORMAL, "mod_$modname", 'Upgrade savepoint reached');
db9d4a3d 197
198 // reset upgrade timeout to default
199 upgrade_set_timeout();
200
201 // this is a safe place to stop upgrades if user aborts page loading
202 if ($allowabort and connection_aborted()) {
203 die;
204 }
205}
206
207/**
208 * Blocks upgrade savepoint, marks end of blocks upgrade blocks
209 * It stores block version, resets upgrade timeout
210 * and abort upgrade if user cancels page loading.
211 *
72fb21b6 212 * @global object
db9d4a3d 213 * @param bool $result false if upgrade step failed, true if completed
214 * @param string or float $version main version
215 * @param string $blockname name of block
216 * @param bool $allowabort allow user to abort script execution here
217 * @return void
218 */
795a08ad 219function upgrade_block_savepoint($result, $version, $blockname, $allowabort=true) {
db9d4a3d 220 global $DB;
221
795a08ad 222 if (!$result) {
520cea92 223 throw new upgrade_exception("block_$blockname", $version);
795a08ad 224 }
225
db9d4a3d 226 if (!$block = $DB->get_record('block', array('name'=>$blockname))) {
227 print_error('blocknotexist', 'debug', '', $blockname);
228 }
229
795a08ad 230 if ($block->version >= $version) {
231 // something really wrong is going on in upgrade script
520cea92 232 throw new downgrade_exception("block_$blockname", $block->version, $version);
db9d4a3d 233 }
795a08ad 234 $block->version = $version;
235 $DB->update_record('block', $block);
520cea92 236 upgrade_log(UPGRADE_LOG_NORMAL, "block_$blockname", 'Upgrade savepoint reached');
db9d4a3d 237
238 // reset upgrade timeout to default
239 upgrade_set_timeout();
240
241 // this is a safe place to stop upgrades if user aborts page loading
242 if ($allowabort and connection_aborted()) {
243 die;
244 }
245}
246
247/**
248 * Plugins upgrade savepoint, marks end of blocks upgrade blocks
249 * It stores plugin version, resets upgrade timeout
250 * and abort upgrade if user cancels page loading.
251 *
252 * @param bool $result false if upgrade step failed, true if completed
253 * @param string or float $version main version
254 * @param string $type name of plugin
255 * @param string $dir location of plugin
256 * @param bool $allowabort allow user to abort script execution here
257 * @return void
258 */
17da2e6f 259function upgrade_plugin_savepoint($result, $version, $type, $plugin, $allowabort=true) {
260 $component = $type.'_'.$plugin;
261
795a08ad 262 if (!$result) {
17da2e6f 263 throw new upgrade_exception($component, $version);
db9d4a3d 264 }
265
17da2e6f 266 $installedversion = get_config($component, 'version');
795a08ad 267 if ($installedversion >= $version) {
268 // Something really wrong is going on in the upgrade script
269 throw new downgrade_exception($component, $installedversion, $version);
270 }
17da2e6f 271 set_config('version', $version, $component);
795a08ad 272 upgrade_log(UPGRADE_LOG_NORMAL, $component, 'Upgrade savepoint reached');
273
db9d4a3d 274 // Reset upgrade timeout to default
275 upgrade_set_timeout();
276
277 // This is a safe place to stop upgrades if user aborts page loading
278 if ($allowabort and connection_aborted()) {
279 die;
280 }
281}
282
283
284/**
285 * Upgrade plugins
db9d4a3d 286 * @param string $type The type of plugins that should be updated (e.g. 'enrol', 'qtype')
17da2e6f 287 * return void
db9d4a3d 288 */
17da2e6f 289function upgrade_plugins($type, $startcallback, $endcallback, $verbose) {
db9d4a3d 290 global $CFG, $DB;
291
292/// special cases
293 if ($type === 'mod') {
194cdca8 294 return upgrade_plugins_modules($startcallback, $endcallback, $verbose);
795a08ad 295 } else if ($type === 'block') {
194cdca8 296 return upgrade_plugins_blocks($startcallback, $endcallback, $verbose);
db9d4a3d 297 }
298
17da2e6f 299 $plugs = get_plugin_list($type);
db9d4a3d 300
17da2e6f 301 foreach ($plugs as $plug=>$fullplug) {
302 $component = $type.'_'.$plug; // standardised plugin name
db9d4a3d 303
795a08ad 304 if (!is_readable($fullplug.'/version.php')) {
305 continue;
db9d4a3d 306 }
307
795a08ad 308 $plugin = new object();
309 require($fullplug.'/version.php'); // defines $plugin with version etc
db9d4a3d 310
795a08ad 311 if (empty($plugin->version)) {
312 throw new plugin_defective_exception($component, 'Missing version value in version.php');
db9d4a3d 313 }
314
17da2e6f 315 $plugin->name = $plug;
316 $plugin->fullname = $component;
795a08ad 317
318
db9d4a3d 319 if (!empty($plugin->requires)) {
320 if ($plugin->requires > $CFG->version) {
795a08ad 321 throw new upgrade_requires_exception($component, $plugin->version, $CFG->version, $plugin->requires);
db9d4a3d 322 }
323 }
324
9b683d13 325 // try to recover from interrupted install.php if needed
326 if (file_exists($fullplug.'/db/install.php')) {
327 if (get_config($plugin->fullname, 'installrunning')) {
328 require_once($fullplug.'/db/install.php');
329 $recover_install_function = 'xmldb_'.$plugin->fullname.'_install_recovery';
330 if (function_exists($recover_install_function)) {
331 $startcallback($component, true, $verbose);
332 $recover_install_function();
333 unset_config('installrunning', 'block_'.$plugin->fullname);
334 update_capabilities($component);
c976e271 335 external_update_descriptions($component);
9b683d13 336 events_update_definition($component);
337 message_update_providers($component);
338 $endcallback($component, true, $verbose);
339 }
340 }
341 }
db9d4a3d 342
9b683d13 343 $installedversion = get_config($plugin->fullname, 'version');
795a08ad 344 if (empty($installedversion)) { // new installation
194cdca8 345 $startcallback($component, true, $verbose);
db9d4a3d 346
795a08ad 347 /// Install tables if defined
348 if (file_exists($fullplug.'/db/install.xml')) {
349 $DB->get_manager()->install_from_xmldb_file($fullplug.'/db/install.xml');
db9d4a3d 350 }
9b683d13 351
352 /// store version
353 upgrade_plugin_savepoint(true, $plugin->version, $type, $plug, false);
354
795a08ad 355 /// execute post install file
356 if (file_exists($fullplug.'/db/install.php')) {
357 require_once($fullplug.'/db/install.php');
9b683d13 358 set_config('installrunning', 1, 'block_'.$plugin->fullname);
795a08ad 359 $post_install_function = 'xmldb_'.$plugin->fullname.'_install';;
360 $post_install_function();
9b683d13 361 unset_config('installrunning', 'block_'.$plugin->fullname);
795a08ad 362 }
363
795a08ad 364 /// Install various components
365 update_capabilities($component);
c976e271 366 external_update_descriptions($component);
795a08ad 367 events_update_definition($component);
368 message_update_providers($component);
369
db4e1a3c 370 theme_reset_all_caches();
194cdca8 371 $endcallback($component, true, $verbose);
795a08ad 372
373 } else if ($installedversion < $plugin->version) { // upgrade
374 /// Run the upgrade function for the plugin.
194cdca8 375 $startcallback($component, false, $verbose);
795a08ad 376
377 if (is_readable($fullplug.'/db/upgrade.php')) {
378 require_once($fullplug.'/db/upgrade.php'); // defines upgrading function
379
380 $newupgrade_function = 'xmldb_'.$plugin->fullname.'_upgrade';
381 $result = $newupgrade_function($installedversion);
382 } else {
383 $result = true;
384 }
385
386 $installedversion = get_config($plugin->fullname, 'version');
387 if ($installedversion < $plugin->version) {
388 // store version if not already there
389 upgrade_plugin_savepoint($result, $plugin->version, $type, $plug, false);
390 }
391
392 /// Upgrade various components
393 update_capabilities($component);
c976e271 394 external_update_descriptions($component);
795a08ad 395 events_update_definition($component);
396 message_update_providers($component);
397
db4e1a3c 398 theme_reset_all_caches();
194cdca8 399 $endcallback($component, false, $verbose);
795a08ad 400
401 } else if ($installedversion > $plugin->version) {
402 throw new downgrade_exception($component, $installedversion, $plugin->version);
db9d4a3d 403 }
404 }
db9d4a3d 405}
406
407/**
408 * Find and check all modules and load them up or upgrade them if necessary
72fb21b6 409 *
410 * @global object
411 * @global object
db9d4a3d 412 */
194cdca8 413function upgrade_plugins_modules($startcallback, $endcallback, $verbose) {
db9d4a3d 414 global $CFG, $DB;
415
17da2e6f 416 $mods = get_plugin_list('mod');
db9d4a3d 417
17da2e6f 418 foreach ($mods as $mod=>$fullmod) {
db9d4a3d 419
420 if ($mod == 'NEWMODULE') { // Someone has unzipped the template, ignore it
421 continue;
422 }
423
17da2e6f 424 $component = 'mod_'.$mod;
db9d4a3d 425
795a08ad 426 if (!is_readable($fullmod.'/version.php')) {
427 throw new plugin_defective_exception($component, 'Missing version.php');
db9d4a3d 428 }
429
795a08ad 430 $module = new object();
431 require($fullmod .'/version.php'); // defines $module with version etc
db9d4a3d 432
795a08ad 433 if (empty($module->version)) {
c1fe2368 434 if (isset($module->version)) {
435 // Version is empty but is set - it means its value is 0 or ''. Let us skip such module.
436 // This is inteded for developers so they can work on the early stages of the module.
437 continue;
438 }
795a08ad 439 throw new plugin_defective_exception($component, 'Missing version value in version.php');
db9d4a3d 440 }
441
442 if (!empty($module->requires)) {
443 if ($module->requires > $CFG->version) {
795a08ad 444 throw new upgrade_requires_exception($component, $module->version, $CFG->version, $module->requires);
db9d4a3d 445 }
446 }
447
448 $module->name = $mod; // The name MUST match the directory
449
795a08ad 450 $currmodule = $DB->get_record('modules', array('name'=>$module->name));
db9d4a3d 451
9b683d13 452 if (file_exists($fullmod.'/db/install.php')) {
453 if (get_config($module->name, 'installrunning')) {
454 require_once($fullmod.'/db/install.php');
455 $recover_install_function = 'xmldb_'.$module->name.'_install_recovery';
456 if (function_exists($recover_install_function)) {
457 $startcallback($component, true, $verbose);
458 $recover_install_function();
459 unset_config('installrunning', $module->name);
460 // Install various components too
461 update_capabilities($component);
c976e271 462 external_update_descriptions($component);
9b683d13 463 events_update_definition($component);
464 message_update_providers($component);
465 $endcallback($component, true, $verbose);
466 }
467 }
468 }
469
795a08ad 470 if (empty($currmodule->version)) {
194cdca8 471 $startcallback($component, true, $verbose);
db9d4a3d 472
795a08ad 473 /// Execute install.xml (XMLDB) - must be present in all modules
474 $DB->get_manager()->install_from_xmldb_file($fullmod.'/db/install.xml');
db9d4a3d 475
2e3da297 476 /// Add record into modules table - may be needed in install.php already
477 $module->id = $DB->insert_record('modules', $module);
478
db9d4a3d 479 /// Post installation hook - optional
480 if (file_exists("$fullmod/db/install.php")) {
481 require_once("$fullmod/db/install.php");
9b683d13 482 // Set installation running flag, we need to recover after exception or error
483 set_config('installrunning', 1, $module->name);
db9d4a3d 484 $post_install_function = 'xmldb_'.$module->name.'_install';;
485 $post_install_function();
9b683d13 486 unset_config('installrunning', $module->name);
db9d4a3d 487 }
488
795a08ad 489 /// Install various components
490 update_capabilities($component);
c976e271 491 external_update_descriptions($component);
795a08ad 492 events_update_definition($component);
493 message_update_providers($component);
494
23fd6f83 495 theme_reset_all_caches();
194cdca8 496 $endcallback($component, true, $verbose);
db9d4a3d 497
795a08ad 498 } else if ($currmodule->version < $module->version) {
499 /// If versions say that we need to upgrade but no upgrade files are available, notify and continue
194cdca8 500 $startcallback($component, false, $verbose);
795a08ad 501
502 if (is_readable($fullmod.'/db/upgrade.php')) {
503 require_once($fullmod.'/db/upgrade.php'); // defines new upgrading function
504 $newupgrade_function = 'xmldb_'.$module->name.'_upgrade';
505 $result = $newupgrade_function($currmodule->version, $module);
506 } else {
507 $result = true;
508 }
509
510 $currmodule = $DB->get_record('modules', array('name'=>$module->name));
511 if ($currmodule->version < $module->version) {
512 // store version if not already there
513 upgrade_mod_savepoint($result, $module->version, $mod, false);
514 }
515
516 /// Upgrade various components
517 update_capabilities($component);
c976e271 518 external_update_descriptions($component);
795a08ad 519 events_update_definition($component);
520 message_update_providers($component);
521
23fd6f83 522 theme_reset_all_caches();
795a08ad 523 remove_dir($CFG->dataroot.'/cache', true); // flush cache
524
194cdca8 525 $endcallback($component, false, $verbose);
795a08ad 526
527 } else if ($currmodule->version > $module->version) {
528 throw new downgrade_exception($component, $currmodule->version, $module->version);
529 }
530 }
531}
db9d4a3d 532
db9d4a3d 533
795a08ad 534/**
535 * This function finds all available blocks and install them
536 * into blocks table or do all the upgrade process if newer.
72fb21b6 537 *
538 * @global object
539 * @global object
795a08ad 540 */
194cdca8 541function upgrade_plugins_blocks($startcallback, $endcallback, $verbose) {
795a08ad 542 global $CFG, $DB;
543
795a08ad 544 require_once($CFG->dirroot.'/blocks/moodleblock.class.php');
545
546 $blocktitles = array(); // we do not want duplicate titles
547
548 //Is this a first install
549 $first_install = null;
550
17da2e6f 551 $blocks = get_plugin_list('block');
795a08ad 552
17da2e6f 553 foreach ($blocks as $blockname=>$fullblock) {
795a08ad 554
555 if (is_null($first_install)) {
556 $first_install = ($DB->count_records('block') == 0);
557 }
558
559 if ($blockname == 'NEWBLOCK') { // Someone has unzipped the template, ignore it
560 continue;
db9d4a3d 561 }
562
17da2e6f 563 $component = 'block_'.$blockname;
db9d4a3d 564
795a08ad 565 if (!is_readable($fullblock.'/block_'.$blockname.'.php')) {
566 throw new plugin_defective_exception('block/'.$blockname, 'Missing main block class file.');
db9d4a3d 567 }
795a08ad 568 require_once($fullblock.'/block_'.$blockname.'.php');
db9d4a3d 569
795a08ad 570 $classname = 'block_'.$blockname;
571
572 if (!class_exists($classname)) {
573 throw new plugin_defective_exception($component, 'Can not load main class.');
574 }
575
576 $blockobj = new $classname; // This is what we 'll be testing
577 $blocktitle = $blockobj->get_title();
578
579 // OK, it's as we all hoped. For further tests, the object will do them itself.
580 if (!$blockobj->_self_test()) {
581 throw new plugin_defective_exception($component, 'Self test failed.');
582 }
583
584 $block = new object(); // This may be used to update the db below
585 $block->name = $blockname; // The name MUST match the directory
586 $block->version = $blockobj->get_version();
587 $block->cron = !empty($blockobj->cron) ? $blockobj->cron : 0;
588 $block->multiple = $blockobj->instance_allow_multiple() ? 1 : 0;
589
590 if (empty($block->version)) {
591 throw new plugin_defective_exception($component, 'Missing block version.');
592 }
593
594 $currblock = $DB->get_record('block', array('name'=>$block->name));
595
9b683d13 596 if (file_exists($fullblock.'/db/install.php')) {
597 if (get_config('block_'.$blockname, 'installrunning')) {
598 require_once($fullblock.'/db/install.php');
599 $recover_install_function = 'xmldb_block_'.$blockname.'_install_recovery';
600 if (function_exists($recover_install_function)) {
601 $startcallback($component, true, $verbose);
602 $recover_install_function();
603 unset_config('installrunning', 'block_'.$blockname);
604 // Install various components
605 update_capabilities($component);
c976e271 606 external_update_descriptions($component);
9b683d13 607 events_update_definition($component);
608 message_update_providers($component);
609 $endcallback($component, true, $verbose);
610 }
611 }
612 }
613
795a08ad 614 if (empty($currblock->version)) { // block not installed yet, so install it
615 // If it allows multiples, start with it enabled
616
617 $conflictblock = array_search($blocktitle, $blocktitles);
618 if ($conflictblock !== false) {
619 // Duplicate block titles are not allowed, they confuse people
620 // AND PHP's associative arrays ;)
621 throw new plugin_defective_exception($component, get_string('blocknameconflict', '', (object)array('name'=>$block->name, 'conflict'=>$conflictblock)));
622 }
194cdca8 623 $startcallback($component, true, $verbose);
795a08ad 624
625 if (file_exists($fullblock.'/db/install.xml')) {
626 $DB->get_manager()->install_from_xmldb_file($fullblock.'/db/install.xml');
627 }
628 $block->id = $DB->insert_record('block', $block);
629
630 if (file_exists($fullblock.'/db/install.php')) {
631 require_once($fullblock.'/db/install.php');
9b683d13 632 // Set installation running flag, we need to recover after exception or error
633 set_config('installrunning', 1, 'block_'.$blockname);
795a08ad 634 $post_install_function = 'xmldb_block_'.$blockname.'_install';;
635 $post_install_function();
9b683d13 636 unset_config('installrunning', 'block_'.$blockname);
795a08ad 637 }
638
639 $blocktitles[$block->name] = $blocktitle;
640
641 // Install various components
642 update_capabilities($component);
c976e271 643 external_update_descriptions($component);
795a08ad 644 events_update_definition($component);
645 message_update_providers($component);
646
23fd6f83 647 theme_reset_all_caches();
194cdca8 648 $endcallback($component, true, $verbose);
795a08ad 649
650 } else if ($currblock->version < $block->version) {
194cdca8 651 $startcallback($component, false, $verbose);
795a08ad 652
653 if (is_readable($fullblock.'/db/upgrade.php')) {
654 require_once($fullblock.'/db/upgrade.php'); // defines new upgrading function
655 $newupgrade_function = 'xmldb_block_'.$blockname.'_upgrade';
656 $result = $newupgrade_function($currblock->version, $block);
657 } else {
658 $result = true;
659 }
660
661 $currblock = $DB->get_record('block', array('name'=>$block->name));
662 if ($currblock->version < $block->version) {
663 // store version if not already there
664 upgrade_block_savepoint($result, $block->version, $block->name, false);
665 }
666
667 if ($currblock->cron != $block->cron) {
668 // update cron flag if needed
669 $currblock->cron = $block->cron;
670 $DB->update_record('block', $currblock);
671 }
672
673 // Upgrade various componebts
795a08ad 674 update_capabilities($component);
c976e271 675 external_update_descriptions($component);
17da2e6f 676 events_update_definition($component);
795a08ad 677 message_update_providers($component);
678
23fd6f83 679 theme_reset_all_caches();
194cdca8 680 $endcallback($component, false, $verbose);
795a08ad 681
682 } else if ($currblock->version > $block->version) {
683 throw new downgrade_exception($component, $currblock->version, $block->version);
684 }
685 }
686
687
688 // Finally, if we are in the first_install of BLOCKS setup frontpage and admin page blocks
689 if ($first_install) {
795a08ad 690 //Iterate over each course - there should be only site course here now
691 if ($courses = $DB->get_records('course')) {
692 foreach ($courses as $course) {
9d1d606e 693 blocks_add_default_course_blocks($course);
db9d4a3d 694 }
695 }
795a08ad 696
9d1d606e 697 blocks_add_default_system_blocks();
795a08ad 698 }
699}
700
c976e271 701/**
702 * Web service discovery function used during install and upgrade.
703 * @param string $component name of component (moodle, mod_assignment, etc.)
704 * @return void
705 */
706function external_update_descriptions($component) {
707 global $DB;
708
709 $defpath = get_component_directory($component).'/db/services.php';
710
711 if (!file_exists($defpath)) {
712 external_delete_descriptions($component);
713 return;
714 }
715
716 // load new info
717 $functions = array();
718 $services = array();
719 include($defpath);
720
721 // update all function fist
722 $dbfunctions = $DB->get_records('external_functions', array('component'=>$component));
723 foreach ($dbfunctions as $dbfunction) {
724 if (empty($functions[$dbfunction->name])) {
725 $DB->delete_records('external_functions', array('id'=>$dbfunction->id));
726 // do not delete functions from external_services_functions, beacuse
727 // we want to notify admins when functions used in custom services disappear
728 continue;
729 }
730
731 $function = $functions[$dbfunction->name];
732 unset($functions[$dbfunction->name]);
733 $function['classpath'] = empty($function['classpath']) ? null : $function['classpath'];
734
735 $update = false;
736 if ($dbfunction->classname != $function['classname']) {
737 $dbfunction->classname = $function['classname'];
738 $update = true;
739 }
740 if ($dbfunction->methodname != $function['methodname']) {
741 $dbfunction->methodname = $function['methodname'];
742 $update = true;
743 }
744 if ($dbfunction->classpath != $function['classpath']) {
745 $dbfunction->classpath = $function['classpath'];
746 $update = true;
747 }
748 if ($update) {
749 $DB->update_record('external_functions', $dbfunction);
750 }
751 }
752 foreach ($functions as $fname => $function) {
753 $dbfunction = new object();
754 $dbfunction->name = $fname;
755 $dbfunction->classname = $function['classname'];
756 $dbfunction->methodname = $function['methodname'];
757 $dbfunction->classpath = empty($function['classpath']) ? null : $function['classpath'];
758 $dbfunction->component = $component;
759 $dbfunction->id = $DB->insert_record('external_functions', $dbfunction);
760 }
761 unset($functions);
762
763 // now deal with services
764 $dbservices = $DB->get_records('external_services', array('component'=>$component));
765 foreach ($dbservices as $dbservice) {
766 if (empty($services[$dbservice->name])) {
767 $DB->delete_records('external_services_functions', array('externalserviceid'=>$dbservice->id));
768 $DB->delete_records('external_services_users', array('externalserviceid'=>$dbservice->id));
769 $DB->delete_records('external_services', array('id'=>$dbservice->id));
770 continue;
771 }
772 $service = $services[$dbservice->name];
773 unset($services[$dbservice->name]);
774 $service['enabled'] = empty($service['enabled']) ? 0 : $service['enabled'];
775 $service['requiredcapability'] = empty($service['requiredcapability']) ? null : $service['requiredcapability'];
776 $service['restrictedusers'] = !isset($service['restrictedusers']) ? 1 : $service['restrictedusers'];
777
778 $update = false;
779 if ($dbservice->enabled != $service['enabled']) {
780 $dbservice->enabled = $service['enabled'];
781 $update = true;
782 }
783 if ($dbservice->requiredcapability != $service['requiredcapability']) {
784 $dbservice->requiredcapability = $service['requiredcapability'];
785 $update = true;
786 }
787 if ($dbservice->restrictedusers != $service['restrictedusers']) {
788 $dbservice->restrictedusers = $service['restrictedusers'];
789 $update = true;
790 }
791 if ($update) {
792 $DB->update_record('external_services', $dbservice);
793 }
794
795 $functions = $DB->get_records('external_services_functions', array('externalserviceid'=>$dbservice->id));
796 foreach ($functions as $function) {
797 $key = array_search($function->functionname, $service['functions']);
798 if ($key === false) {
799 $DB->delete_records('external_services_functions', array('id'=>$function->id));
800 } else {
801 unset($service['functions'][$key]);
802 }
803 }
804 foreach ($service['functions'] as $fname) {
805 $newf = new object();
806 $newf->externalserviceid = $dbservice->id;
807 $newf->functionname = $fname;
808 $DB->insert_record('external_services_functions', $newf);
809 }
810 unset($functions);
811 }
812 foreach ($services as $name => $service) {
813 $dbservice = new object();
814 $dbservice->name = $name;
815 $dbservice->enabled = empty($service['enabled']) ? 0 : $service['enabled'];
816 $dbservice->requiredcapability = empty($service['requiredcapability']) ? null : $service['requiredcapability'];
817 $dbservice->restrictedusers = !isset($service['restrictedusers']) ? 1 : $service['restrictedusers'];
818 $dbservice->component = $component;
e5180580 819 $dbservice->timecreated = time();
c976e271 820 $dbservice->id = $DB->insert_record('external_services', $dbservice);
821 foreach ($service['functions'] as $fname) {
822 $newf = new object();
823 $newf->externalserviceid = $dbservice->id;
824 $newf->functionname = $fname;
825 $DB->insert_record('external_services_functions', $newf);
826 }
827 }
828}
829
830/**
831 * Delete all service and external functions information defined in the specified compoment.
832 * @param string $component name of component (moodle, mod_assignment, etc.)
833 * @return void
834 */
835function external_delete_descriptions($component) {
836 global $DB;
837
838 $params = array($component);
839
840 $DB->delete_records_select('external_services_users', "externalserviceid IN (SELECT id FROM {external_services} WHERE component = ?)", $params);
841 $DB->delete_records_select('external_services_functions', "externalserviceid IN (SELECT id FROM {external_services} WHERE component = ?)", $params);
842 $DB->delete_records('external_services', array('component'=>$component));
843 $DB->delete_records('external_functions', array('component'=>$component));
844}
845
72fb21b6 846/**
847 * upgrade logging functions
72fb21b6 848 */
fd1a792e 849function upgrade_handle_exception($ex, $plugin = null) {
a56c457e
PS
850 // rollback everything, we need to log all upgrade problems
851 abort_all_db_transactions();
852
c19bc39c
PS
853 $info = get_exception_info($ex);
854
855 // First log upgrade error
856 upgrade_log(UPGRADE_LOG_ERROR, $plugin, 'Exception: ' . get_class($ex), $info->message, $info->backtrace);
857
858 // Always turn on debugging - admins need to know what is going on
859 $CFG->debug = DEBUG_DEVELOPER;
860
fd1a792e 861 default_exception_handler($ex, true, $plugin);
db9d4a3d 862}
863
864/**
865 * Adds log entry into upgrade_log table
866 *
72fb21b6 867 * @global object
868 * @global object
869 * @global object
db9d4a3d 870 * @param int $type UPGRADE_LOG_NORMAL, UPGRADE_LOG_NOTICE or UPGRADE_LOG_ERROR
871 * @param string $plugin plugin or null if main
872 * @param string $info short description text of log entry
873 * @param string $details long problem description
874 * @param string $backtrace string used for errors only
875 * @return void
876 */
877function upgrade_log($type, $plugin, $info, $details=null, $backtrace=null) {
878 global $DB, $USER, $CFG;
879
795a08ad 880 $plugin = ($plugin==='moodle') ? null : $plugin;
881
34a2777c 882 $backtrace = format_backtrace($backtrace, true);
db9d4a3d 883
884 $version = null;
885
886 //first try to find out current version number
795a08ad 887 if (empty($plugin) or $plugin === 'moodle') {
db9d4a3d 888 //main
889 $version = $CFG->version;
890
795a08ad 891 } else if ($plugin === 'local') {
892 //customisation
893 $version = $CFG->local_version;
894
895 } else if (strpos($plugin, 'mod/') === 0) {
db9d4a3d 896 try {
897 $modname = substr($plugin, strlen('mod/'));
898 $version = $DB->get_field('modules', 'version', array('name'=>$modname));
795a08ad 899 $version = ($version === false) ? null : $version;
db9d4a3d 900 } catch (Exception $ignored) {
901 }
902
795a08ad 903 } else if (strpos($plugin, 'block/') === 0) {
db9d4a3d 904 try {
795a08ad 905 $blockname = substr($plugin, strlen('block/'));
db9d4a3d 906 if ($block = $DB->get_record('block', array('name'=>$blockname))) {
907 $version = $block->version;
908 }
909 } catch (Exception $ignored) {
910 }
795a08ad 911
912 } else {
913 $pluginversion = get_config(str_replace('/', '_', $plugin), 'version');
914 if (!empty($pluginversion)) {
915 $version = $pluginversion;
916 }
db9d4a3d 917 }
918
919 $log = new object();
920 $log->type = $type;
921 $log->plugin = $plugin;
922 $log->version = $version;
923 $log->info = $info;
924 $log->details = $details;
925 $log->backtrace = $backtrace;
926 $log->userid = $USER->id;
927 $log->timemodified = time();
db9d4a3d 928 try {
929 $DB->insert_record('upgrade_log', $log);
930 } catch (Exception $ignored) {
795a08ad 931 // possible during install or 2.0 upgrade
db9d4a3d 932 }
933}
934
935/**
936 * Marks start of upgrade, blocks any other access to site.
937 * The upgrade is finished at the end of script or after timeout.
72fb21b6 938 *
939 * @global object
940 * @global object
941 * @global object
db9d4a3d 942 */
943function upgrade_started($preinstall=false) {
de6d81e6 944 global $CFG, $DB, $PAGE, $OUTPUT;
db9d4a3d 945
946 static $started = false;
947
948 if ($preinstall) {
949 ignore_user_abort(true);
950 upgrade_setup_debug(true);
951
952 } else if ($started) {
953 upgrade_set_timeout(120);
954
955 } else {
c13a5e71 956 if (!CLI_SCRIPT and !$PAGE->headerprinted) {
db9d4a3d 957 $strupgrade = get_string('upgradingversion', 'admin');
78946b9b 958 $PAGE->set_pagelayout('maintenance');
543f54d3 959 upgrade_init_javascript();
de6d81e6 960 $PAGE->set_title($strupgrade.' - Moodle '.$CFG->target_release);
961 $PAGE->set_heading($strupgrade);
962 $PAGE->navbar->add($strupgrade);
963 $PAGE->set_cacheable(false);
964 echo $OUTPUT->header();
db9d4a3d 965 }
966
967 ignore_user_abort(true);
968 register_shutdown_function('upgrade_finished_handler');
969 upgrade_setup_debug(true);
970 set_config('upgraderunning', time()+300);
971 $started = true;
972 }
973}
974
975/**
976 * Internal function - executed if upgrade interruped.
977 */
978function upgrade_finished_handler() {
979 upgrade_finished();
980}
981
982/**
983 * Indicates upgrade is finished.
984 *
985 * This function may be called repeatedly.
72fb21b6 986 *
987 * @global object
988 * @global object
db9d4a3d 989 */
990function upgrade_finished($continueurl=null) {
7e0d6675 991 global $CFG, $DB, $OUTPUT;
db9d4a3d 992
993 if (!empty($CFG->upgraderunning)) {
994 unset_config('upgraderunning');
995 upgrade_setup_debug(false);
996 ignore_user_abort(false);
997 if ($continueurl) {
aa9a6867 998 echo $OUTPUT->continue_button($continueurl);
7e0d6675 999 echo $OUTPUT->footer();
db9d4a3d 1000 die;
1001 }
1002 }
1003}
1004
72fb21b6 1005/**
1006 * @global object
1007 * @global object
1008 */
db9d4a3d 1009function upgrade_setup_debug($starting) {
1010 global $CFG, $DB;
1011
1012 static $originaldebug = null;
1013
1014 if ($starting) {
1015 if ($originaldebug === null) {
1016 $originaldebug = $DB->get_debug();
1017 }
1018 if (!empty($CFG->upgradeshowsql)) {
1019 $DB->set_debug(true);
1020 }
1021 } else {
1022 $DB->set_debug($originaldebug);
1023 }
1024}
1025
72fb21b6 1026/**
1027 * @global object
1028 */
90509582 1029function print_upgrade_reload($url) {
f2a1963c 1030 global $OUTPUT;
90509582 1031
1032 echo "<br />";
1033 echo '<div class="continuebutton">';
b5d0cafc 1034 echo '<a href="'.$url.'" title="'.get_string('reload').'" ><img src="'.$OUTPUT->pix_url('i/reload') . '" alt="" /> '.get_string('reload').'</a>';
90509582 1035 echo '</div><br />';
1036}
1037
db9d4a3d 1038function print_upgrade_separator() {
1039 if (!CLI_SCRIPT) {
1040 echo '<hr />';
1041 }
1042}
1043
795a08ad 1044/**
1045 * Default start upgrade callback
1046 * @param string $plugin
1047 * @param bool $installation true if installation, false menas upgrade
1048 */
194cdca8 1049function print_upgrade_part_start($plugin, $installation, $verbose) {
3c159385 1050 global $OUTPUT;
795a08ad 1051 if (empty($plugin) or $plugin == 'moodle') {
1052 upgrade_started($installation); // does not store upgrade running flag yet
194cdca8 1053 if ($verbose) {
3c159385 1054 echo $OUTPUT->heading(get_string('coresystem'));
194cdca8 1055 }
795a08ad 1056 } else {
1057 upgrade_started();
194cdca8 1058 if ($verbose) {
3c159385 1059 echo $OUTPUT->heading($plugin);
194cdca8 1060 }
795a08ad 1061 }
1062 if ($installation) {
1063 if (empty($plugin) or $plugin == 'moodle') {
1064 // no need to log - log table not yet there ;-)
1065 } else {
1066 upgrade_log(UPGRADE_LOG_NORMAL, $plugin, 'Starting plugin installation');
1067 }
1068 } else {
1069 if (empty($plugin) or $plugin == 'moodle') {
1070 upgrade_log(UPGRADE_LOG_NORMAL, $plugin, 'Starting core upgrade');
1071 } else {
1072 upgrade_log(UPGRADE_LOG_NORMAL, $plugin, 'Starting plugin upgrade');
1073 }
1074 }
1075}
1076
1077/**
1078 * Default end upgrade callback
1079 * @param string $plugin
1080 * @param bool $installation true if installation, false menas upgrade
1081 */
194cdca8 1082function print_upgrade_part_end($plugin, $installation, $verbose) {
aa9a6867 1083 global $OUTPUT;
795a08ad 1084 upgrade_started();
1085 if ($installation) {
1086 if (empty($plugin) or $plugin == 'moodle') {
1087 upgrade_log(UPGRADE_LOG_NORMAL, $plugin, 'Core installed');
1088 } else {
1089 upgrade_log(UPGRADE_LOG_NORMAL, $plugin, 'Plugin installed');
1090 }
1091 } else {
1092 if (empty($plugin) or $plugin == 'moodle') {
1093 upgrade_log(UPGRADE_LOG_NORMAL, $plugin, 'Core upgraded');
1094 } else {
1095 upgrade_log(UPGRADE_LOG_NORMAL, $plugin, 'Plugin upgraded');
1096 }
1097 }
194cdca8 1098 if ($verbose) {
aa9a6867 1099 echo $OUTPUT->notification(get_string('success'), 'notifysuccess');
194cdca8 1100 print_upgrade_separator();
96db14f9 1101 }
1102}
1103
72fb21b6 1104/**
543f54d3 1105 * Sets up JS code required for all ugprade scripts.
72fb21b6 1106 * @global object
1107 */
543f54d3 1108function upgrade_init_javascript() {
e29380f3 1109 global $PAGE;
543f54d3
PS
1110 // scroll to the end of each upgrade page so that ppl see either error or continue button,
1111 // no need to scroll continuously any more, it is enough to jump to end once the footer is printed ;-)
1112 $js = "window.scrollTo(0, 5000000);";
1113 $PAGE->requires->js_init_code($js);
db9d4a3d 1114}
1115
1116
1117/**
1118 * Try to upgrade the given language pack (or current language)
72fb21b6 1119 * @global object
db9d4a3d 1120 */
1121function upgrade_language_pack($lang='') {
3c159385 1122 global $CFG, $OUTPUT;
db9d4a3d 1123
1124 if (empty($lang)) {
1125 $lang = current_language();
1126 }
1127
1128 if ($lang == 'en_utf8') {
1129 return true; // Nothing to do
1130 }
1131
551fe0e5 1132 upgrade_started(false);
3c159385 1133 echo $OUTPUT->heading(get_string('langimport', 'admin').': '.$lang);
db9d4a3d 1134
1135 @mkdir ($CFG->dataroot.'/temp/'); //make it in case it's a fresh install, it might not be there
1136 @mkdir ($CFG->dataroot.'/lang/');
1137
1138 require_once($CFG->libdir.'/componentlib.class.php');
1139
1140 if ($cd = new component_installer('http://download.moodle.org', 'lang16', $lang.'.zip', 'languages.md5', 'lang')) {
1141 $status = $cd->install(); //returns COMPONENT_(ERROR | UPTODATE | INSTALLED)
1142
1143 if ($status == COMPONENT_INSTALLED) {
db9d4a3d 1144 @unlink($CFG->dataroot.'/cache/languages');
551fe0e5 1145 if ($parentlang = get_parent_language($lang)) {
1146 if ($cd = new component_installer('http://download.moodle.org', 'lang16', $parentlang.'.zip', 'languages.md5', 'lang')) {
1147 $cd->install();
1148 }
1149 }
aa9a6867 1150 echo $OUTPUT->notification(get_string('success'), 'notifysuccess');
db9d4a3d 1151 }
1152 }
1153
551fe0e5 1154 print_upgrade_separator();
db9d4a3d 1155}
8580535b 1156
1157/**
1158 * Install core moodle tables and initialize
1159 * @param float $version target version
1160 * @param bool $verbose
1161 * @return void, may throw exception
1162 */
1163function install_core($version, $verbose) {
1164 global $CFG, $DB;
1165
1166 try {
c3d0e149 1167 set_time_limit(600);
194cdca8 1168 print_upgrade_part_start('moodle', true, $verbose); // does not store upgrade running flag
8580535b 1169
1170 $DB->get_manager()->install_from_xmldb_file("$CFG->libdir/db/install.xml");
1171 upgrade_started(); // we want the flag to be stored in config table ;-)
1172
1173 // set all core default records and default settings
1174 require_once("$CFG->libdir/db/install.php");
1175 xmldb_main_install();
1176
1177 // store version
1178 upgrade_main_savepoint(true, $version, false);
1179
1180 // Continue with the instalation
1181 events_update_definition('moodle');
1182 message_update_providers('moodle');
8580535b 1183
1184 // Write default settings unconditionlly
1185 admin_apply_default_settings(NULL, true);
1186
194cdca8 1187 print_upgrade_part_end(null, true, $verbose);
8580535b 1188 } catch (exception $ex) {
1189 upgrade_handle_exception($ex);
1190 }
1191}
1192
1193/**
1194 * Upgrade moodle core
1195 * @param float $version target version
1196 * @param bool $verbose
1197 * @return void, may throw exception
1198 */
1199function upgrade_core($version, $verbose) {
1200 global $CFG;
1201
3316fe24 1202 require_once($CFG->libdir.'/db/upgrade.php'); // Defines upgrades
3316fe24 1203
8580535b 1204 try {
1205 // Upgrade current language pack if we can
1206 if (empty($CFG->skiplangupgrade)) {
1207 upgrade_language_pack(false);
1208 }
1209
194cdca8 1210 print_upgrade_part_start('moodle', false, $verbose);
8580535b 1211
17da2e6f 1212 // one time special local migration pre 2.0 upgrade script
1213 if ($version < 2007101600) {
1214 $pre20upgradefile = "$CFG->dirrot/local/upgrade_pre20.php";
1215 if (file_exists($pre20upgradefile)) {
1216 set_time_limit(0);
1217 require($pre20upgradefile);
1218 // reset upgrade timeout to default
1219 upgrade_set_timeout();
1220 }
1221 }
1222
8580535b 1223 $result = xmldb_main_upgrade($CFG->version);
1224 if ($version > $CFG->version) {
1225 // store version if not already there
1226 upgrade_main_savepoint($result, $version, false);
1227 }
1228
1229 // perform all other component upgrade routines
1230 update_capabilities('moodle');
c976e271 1231 external_update_descriptions('moodle');
8580535b 1232 events_update_definition('moodle');
1233 message_update_providers('moodle');
8580535b 1234
db4e1a3c 1235 theme_reset_all_caches();
8580535b 1236 remove_dir($CFG->dataroot . '/cache', true); // flush cache
1237
194cdca8 1238 print_upgrade_part_end('moodle', false, $verbose);
8580535b 1239 } catch (Exception $ex) {
1240 upgrade_handle_exception($ex);
1241 }
1242}
1243
1244/**
1245 * Upgrade/install other parts of moodle
1246 * @param bool $verbose
1247 * @return void, may throw exception
1248 */
1249function upgrade_noncore($verbose) {
1250 global $CFG;
1251
8580535b 1252 // upgrade all plugins types
1253 try {
1254 $plugintypes = get_plugin_types();
1255 foreach ($plugintypes as $type=>$location) {
17da2e6f 1256 upgrade_plugins($type, 'print_upgrade_part_start', 'print_upgrade_part_end', $verbose);
8580535b 1257 }
1258 } catch (Exception $ex) {
1259 upgrade_handle_exception($ex);
1260 }
1261
1262 // Check for changes to RPC functions
1263 if ($CFG->mnet_dispatcher_mode != 'off') {
1264 try {
1265 // this needs a full rewrite, sorry to mention that :-(
1266 // we have to make it part of standard WS framework
1267 require_once("$CFG->dirroot/$CFG->admin/mnet/adminlib.php");
1268 upgrade_RPC_functions(); // Return here afterwards
1269 } catch (Exception $ex) {
1270 upgrade_handle_exception($ex);
1271 }
1272 }
8580535b 1273}
3316fe24 1274
1275/**
1276 * Checks if the main tables have been installed yet or not.
1277 * @return bool
1278 */
1279function core_tables_exist() {
1280 global $DB;
1281
1282 if (!$tables = $DB->get_tables() ) { // No tables yet at all.
1283 return false;
9b683d13 1284
3316fe24 1285 } else { // Check for missing main tables
1286 $mtables = array('config', 'course', 'groupings'); // some tables used in 1.9 and 2.0, preferable something from the start and end of install.xml
1287 foreach ($mtables as $mtable) {
1288 if (!in_array($mtable, $tables)) {
1289 return false;
1290 }
1291 }
1292 return true;
9b683d13 1293 }
ba04999c 1294}