backup/backup_scheduled.php

   1 <?php //$Id$
   2     //This file contains all the code needed to execute scheduled backups
   3
   4 //This function is executed via moodle cron
   5 //It prepares all the info and execute backups as necessary
   6 function schedule_backup_cron() {
   7
   8     global $CFG;
   9
  10     $status = true;
  11
  12     $emailpending = false;
  13
  14     //Check for required functions...
  15     if(!function_exists('utf8_encode')) {
  16         mtrace("        ERROR: You need to add XML support to your PHP installation!");
  17         return true;
  18     }
  19
  20     //Get now
  21     $now = time();
  22
  23     //First of all, we have to see if the scheduled is active and detect
  24     //that there isn't another cron running
  25     mtrace("    Checking backup status",'...');
  26     $backup_config = backup_get_config();
  27     if(!isset($backup_config->backup_sche_active) || !$backup_config->backup_sche_active) {
  28         mtrace("INACTIVE");
  29         return true;
  30     } else if (isset($backup_config->backup_sche_running) && $backup_config->backup_sche_running) {
  31         mtrace("RUNNING");
  32         //Now check if it's a really running task or something very old looking
  33         //for info in backup_logs to unlock status as necessary
  34         $timetosee = 1800;   //Half an hour looking for activity
  35         $timeafter = time() - $timetosee;
  36         $numofrec = count_records_select ("backup_log","time > $timeafter");
  37         if (!$numofrec) {
  38             $timetoseemin = $timetosee/60;
  39             mtrace("    No activity in last ".$timetoseemin." minutes. Unlocking status");
  40         } else {
  41             mtrace("    Scheduled backup seems to be running. Execution delayed");
  42             return true;
  43         }
  44     } else {
  45         mtrace("OK");
  46         //Mark backup_sche_running
  47         backup_set_config("backup_sche_running","1");
  48     }
  49
  50     //Now we get the main admin user (we'll use his timezone, mail...)
  51     mtrace("    Getting admin info");
  52     $admin = get_admin();
  53     if (!$admin) {
  54         $status = false;
  55     }
  56
  57     //Delete old_entries from backup tables
  58     if ($status) {
  59         mtrace("    Deleting old data");
  60         $status = backup_delete_old_data();
  61     }
  62
  63     //Now we get a list of courses in the server
  64     if ($status) {
  65         mtrace("    Checking courses");
  66         //First of all, we delete everything from backup tables related to deleted courses
  67         mtrace("        Skipping deleted courses");
  68         $skipped = 0;
  69         if ($bckcourses = get_records('backup_courses')) {
  70             foreach($bckcourses as $bckcourse) {
  71                 //Search if it exists
  72                 if (!$exists = get_record('course', 'id', "$bckcourse->courseid")) {
  73                     //Doesn't exist, so delete from backup tables
  74                     delete_records('backup_courses', 'courseid', "$bckcourse->courseid");
  75                     delete_records('backup_log', 'courseid', "$bckcourse->courseid");
  76                     $skipped++;
  77                 }
  78             }
  79         }
  80         mtrace("            $skipped courses");
  81         //Now process existing courses
  82         $courses = get_records("course");
  83         //For each course, we check (insert, update) the backup_course table
  84         //with needed data
  85         foreach ($courses as $course) {
  86             if ($status) {
  87                 mtrace("        $course->fullname");
  88                 //We check if the course exists in backup_course
  89                 $backup_course = get_record("backup_courses","courseid",$course->id);
  90                 //If it doesn't exist, create
  91                 if (!$backup_course) {
  92                     $temp_backup_course->courseid = $course->id;
  93                     $newid = insert_record("backup_courses",$temp_backup_course);
  94                     //And get it from db
  95                     $backup_course = get_record("backup_courses","id",$newid);
  96                 }
  97                 //If it doesn't exist now, error
  98                 if (!$backup_course) {
  99                     mtrace("            ERROR (in backup_courses detection)");
 100                     $status = false;
 101                     continue;
 102                 }
 103                 // Skip backup of unavailable courses that have remained unmodified in a month
 104                 $skipped = false;
 105                 if (!$course->visible && ($now - $course->timemodified) > 31*24*60*60) {  //Hidden + unmodified last month
 106                     mtrace("            SKIPPING - hidden+unmodified");
 107                     set_field("backup_courses","laststatus","3","courseid",$backup_course->courseid);
 108                     $skipped = true;
 109                 }
 110                 //Now we backup every non skipped course with nextstarttime < now
 111                 if (!$skipped  && $backup_course->nextstarttime > 0 && $backup_course->nextstarttime < $now) {
 112                     //We have to send a email because we have included at least one backup
 113                     $emailpending = true;
 114                     //Only make the backup if laststatus isn't 2-UNFINISHED (uncontrolled error)
 115                     if ($backup_course->laststatus != 2) {
 116                         //Set laststarttime
 117                         $starttime = time();
 118                         set_field("backup_courses","laststarttime",$starttime,"courseid",$backup_course->courseid);
 119                         //Set course status to unfinished, the process will reset it
 120                         set_field("backup_courses","laststatus","2","courseid",$backup_course->courseid);
 121                         //Launch backup
 122                         $course_status = schedule_backup_launch_backup($course,$starttime);
 123                         //Set lastendtime
 124                         set_field("backup_courses","lastendtime",time(),"courseid",$backup_course->courseid);
 125                         //Set laststatus
 126                         if ($course_status) {
 127                             set_field("backup_courses","laststatus","1","courseid",$backup_course->courseid);
 128                         } else {
 129                             set_field("backup_courses","laststatus","0","courseid",$backup_course->courseid);
 130                         }
 131                     }
 132                 }
 133
 134                 //Now, calculate next execution of the course
 135                 $nextstarttime = schedule_backup_next_execution ($backup_course,$backup_config,$now,$admin->timezone);
 136                 //Save it to db
 137                 set_field("backup_courses","nextstarttime",$nextstarttime,"courseid",$backup_course->courseid);
 138                 //Print it to screen as necessary
 139                 $showtime = "undefined";
 140                 if ($nextstarttime > 0) {
 141                     $showtime = userdate($nextstarttime,"",$admin->timezone);
 142                 }
 143                 mtrace("            Next execution: $showtime");
 144             }
 145         }
 146     }
 147
 148     //Delete old logs
 149     if (!empty($CFG->loglifetime)) {
 150         mtrace("    Deleting old logs");
 151         $loglifetime = $now - ($CFG->loglifetime * 86400);
 152         delete_records_select("backup_log", "laststarttime < '$loglifetime'");
 153     }
 154
 155     //Send email to admin if necessary
 156     if ($emailpending) {
 157         mtrace("    Sending email to admin");
 158         $message = "";
 159
 160         //Get info about the status of courses
 161         $count_all = count_records('backup_courses');
 162         $count_ok = count_records('backup_courses','laststatus','1');
 163         $count_error = count_records('backup_courses','laststatus','0');
 164         $count_unfinished = count_records('backup_courses','laststatus','2');
 165         $count_skipped = count_records('backup_courses','laststatus','3');
 166
 167         //Build the message text
 168         //Summary
 169         $message .= get_string('summary')."\n";
 170         $message .= "==================================================\n";
 171         $message .= "  ".get_string('courses').": ".$count_all."\n";
 172         $message .= "  ".get_string('ok').": ".$count_ok."\n";
 173         $message .= "  ".get_string('skipped').": ".$count_skipped."\n";
 174         $message .= "  ".get_string('error').": ".$count_error."\n";
 175         $message .= "  ".get_string('unfinished').": ".$count_unfinished."\n\n";
 176
 177         //Reference
 178         if ($count_error != 0 || $count_unfinished != 0) {
 179             $message .= "  ".get_string('backupfailed')."\n\n";
 180             $dest_url = $CFG->wwwroot.'/admin/report/backups/index.php';
 181             $message .= "  ".get_string('backuptakealook','',$dest_url)."\n\n";
 182             //Set message priority
 183             $admin->priority = 1;
 184             //Reset unfinished to error
 185             set_field('backup_courses','laststatus','0','laststatus','2');
 186         } else {
 187             $message .= "  ".get_string('backupfinished')."\n";
 188         }
 189
 190         //Build the message subject
 191         $site = get_site();
 192         $prefix = $site->shortname.": ";
 193         if ($count_error != 0 || $count_unfinished != 0) {
 194             $prefix .= "[".strtoupper(get_string('error'))."] ";
 195         }
 196         $subject = $prefix.get_string("scheduledbackupstatus");
 197
 198         //Send the message
 199         email_to_user($admin,$admin,$subject,$message);
 200     }
 201
 202
 203     //Everything is finished stop backup_sche_running
 204     backup_set_config("backup_sche_running","0");
 205
 206     return $status;
 207 }
 208
 209 //This function executes the ENTIRE backup of a course (passed as parameter)
 210 //using all the scheduled backup preferences
 211 function schedule_backup_launch_backup($course,$starttime = 0) {
 212
 213     $preferences = false;
 214     $status = false;
 215
 216     mtrace("            Executing backup");
 217     schedule_backup_log($starttime,$course->id,"Start backup course $course->fullname");
 218     schedule_backup_log($starttime,$course->id,"  Phase 1: Checking and counting:");
 219     $preferences = schedule_backup_course_configure($course,$starttime);
 220
 221     if ($preferences) {
 222         schedule_backup_log($starttime,$course->id,"  Phase 2: Executing and copying:");
 223         $status = schedule_backup_course_execute($preferences,$starttime);
 224     }
 225
 226     if ($status && $preferences) {
 227         //Only if the backup_sche_keep is set
 228         if ($preferences->backup_keep) {
 229             schedule_backup_log($starttime,$course->id,"  Phase 3: Deleting old backup files:");
 230             $status = schedule_backup_course_delete_old_files($preferences,$starttime);
 231         }
 232     }
 233
 234     if ($status && $preferences) {
 235         mtrace("            End backup OK");
 236         schedule_backup_log($starttime,$course->id,"End backup course $course->fullname - OK");
 237     } else {
 238         mtrace("            End backup with ERROR");
 239         schedule_backup_log($starttime,$course->id,"End backup course $course->fullname - ERROR!!");
 240     }
 241
 242     return $status && $preferences;
 243 }
 244
 245 //This function saves to backup_log all the needed process info
 246 //to use it later.  NOTE: If $starttime = 0 no info in saved
 247 function schedule_backup_log($starttime,$courseid,$message) {
 248
 249     if ($starttime) {
 250         $log->courseid = $courseid;
 251         $log->time = time();
 252         $log->laststarttime = $starttime;
 253         $log->info = addslashes($message);
 254
 255         insert_record ("backup_log",$log);
 256     }
 257
 258 }
 259
 260 //This function returns the next future GMT time to execute the course based in the
 261 //configuration of the scheduled backups
 262 function schedule_backup_next_execution ($backup_course,$backup_config,$now,$timezone) {
 263
 264     $result = -1;
 265
 266     //Get today's midnight GMT
 267     $midnight = usergetmidnight($now,$timezone);
 268
 269     //Get today's day of week (0=Sunday...6=Saturday)
 270     $date = usergetdate($now,$timezone);
 271     $dayofweek = $date['wday'];
 272
 273     //Get number of days (from today) to execute backups
 274     $scheduled_days = substr($backup_config->backup_sche_weekdays,$dayofweek).
 275                       $backup_config->backup_sche_weekdays;
 276     $daysfromtoday = strpos($scheduled_days, "1");
 277
 278     //If some day has been found
 279     if ($daysfromtoday !== false) {
 280         //Calculate distance
 281         $dist = ($daysfromtoday * 86400) +                     //Days distance
 282                 ($backup_config->backup_sche_hour*3600) +      //Hours distance
 283                 ($backup_config->backup_sche_minute*60);       //Minutes distance
 284         $result = $midnight + $dist;
 285     }
 286
 287     //If that time is past, call the function recursively to obtain the next valid day
 288     if ($result > 0 && $result < time()) {
 289         $result = schedule_backup_next_execution ($backup_course,$backup_config,$now + 86400,$timezone);
 290     }
 291
 292     return $result;
 293 }
 294
 295
 296
 297 //This function implements all the needed code to prepare a course
 298 //to be in backup (insert temp info into backup temp tables).
 299 function schedule_backup_course_configure($course,$starttime = 0) {
 300
 301     global $CFG;
 302
 303     $status = true;
 304
 305     schedule_backup_log($starttime,$course->id,"    checking parameters");
 306
 307     //Check the required variable
 308     if (empty($course->id)) {
 309         $status = false;
 310     }
 311     //Get scheduled backup preferences
 312     $backup_config =  backup_get_config();
 313
 314     //Checks backup_config pairs exist
 315     if ($status) {
 316         if (!isset($backup_config->backup_sche_modules)) {
 317             $backup_config->backup_sche_modules = 1;
 318         }
 319         if (!isset($backup_config->backup_sche_withuserdata)) {
 320             $backup_config->backup_sche_withuserdata = 1;
 321         }
 322         if (!isset($backup_config->backup_sche_metacourse)) {
 323             $backup_config->backup_sche_metacourse = 1;
 324         }
 325         if (!isset($backup_config->backup_sche_users)) {
 326             $backup_config->backup_sche_users = 1;
 327         }
 328         if (!isset($backup_config->backup_sche_logs)) {
 329             $backup_config->backup_sche_logs = 0;
 330         }
 331         if (!isset($backup_config->backup_sche_userfiles)) {
 332             $backup_config->backup_sche_userfiles = 1;
 333         }
 334         if (!isset($backup_config->backup_sche_coursefiles)) {
 335             $backup_config->backup_sche_coursefiles = 1;
 336         }
 337         if (!isset($backup_config->backup_sche_sitefiles)) {
 338             $backup_config->backup_sche_sitefiles = 1;
 339         }
 340         if (!isset($backup_config->backup_sche_messages)) {
 341             $backup_config->backup_sche_messages = 0;
 342         }
 343         if (!isset($backup_config->backup_sche_active)) {
 344             $backup_config->backup_sche_active = 0;
 345         }
 346         if (!isset($backup_config->backup_sche_weekdays)) {
 347             $backup_config->backup_sche_weekdays = "0000000";
 348         }
 349         if (!isset($backup_config->backup_sche_hour)) {
 350             $backup_config->backup_sche_hour = 00;
 351         }
 352         if (!isset($backup_config->backup_sche_minute)) {
 353             $backup_config->backup_sche_minute = 00;
 354         }
 355         if (!isset($backup_config->backup_sche_destination)) {
 356             $backup_config->backup_sche_destination = "";
 357         }
 358         if (!isset($backup_config->backup_sche_keep)) {
 359             $backup_config->backup_sche_keep = 1;
 360         }
 361     }
 362
 363     if ($status) {
 364        //Checks for the required files/functions to backup every mod
 365         //And check if there is data about it
 366         $count = 0;
 367         if ($allmods = get_records("modules") ) {
 368             foreach ($allmods as $mod) {
 369                 $modname = $mod->name;
 370                 $modfile = "$CFG->dirroot/mod/$modname/backuplib.php";
 371                 $modbackup = $modname."_backup_mods";
 372                 $modcheckbackup = $modname."_check_backup_mods";
 373                 if (file_exists($modfile)) {
 374                    include_once($modfile);
 375                    if (function_exists($modbackup) and function_exists($modcheckbackup)) {
 376                        $var = "exists_".$modname;
 377                        $$var = true;
 378                        $count++;
 379
 380                        // PENNY NOTES: I have moved from here to the closing brace inside
 381                        // by two sets of ifs()
 382                        // to avoid the backup failing on a non existant backup.
 383                        // If the file/function/whatever doesn't exist, we don't want to set this
 384                        // this module in backup preferences at all.
 385                        //Check data
 386                        //Check module info
 387                        $var = "backup_".$modname;
 388                        if (!isset($$var)) {
 389                            $$var = $backup_config->backup_sche_modules;
 390                        }
 391                        //Now stores all the mods preferences into an array into preferences
 392                        $preferences->mods[$modname]->backup = $$var;
 393
 394                        //Check include user info
 395                        $var = "backup_user_info_".$modname;
 396                        if (!isset($$var)) {
 397                            $$var = $backup_config->backup_sche_withuserdata;
 398                        }
 399                        //Now stores all the mods preferences into an array into preferences
 400                        $preferences->mods[$modname]->userinfo = $$var;
 401                        //And the name of the mod
 402                        $preferences->mods[$modname]->name = $modname;
 403                    }
 404                 }
 405             }
 406         }
 407         // now set instances
 408         if ($coursemods = get_course_mods($course->id)) {
 409             foreach ($coursemods as $mod) {
 410                 if (array_key_exists($mod->modname,$preferences->mods)) { // we are to backup this module
 411                     if (empty($preferences->mods[$mod->modname]->instances)) {
 412                         $preferences->mods[$mod->modname]->instances = array(); // avoid warnings
 413                     }
 414                     $preferences->mods[$mod->modname]->instances[$mod->instance]->backup = $preferences->mods[$mod->modname]->backup;
 415                     $preferences->mods[$mod->modname]->instances[$mod->instance]->userinfo = $preferences->mods[$mod->modname]->userinfo;
 416                     // there isn't really a nice way to do this...
 417                     $preferences->mods[$mod->modname]->instances[$mod->instance]->name = get_field($mod->modname,'name','id',$mod->instance);
 418                 }
 419             }
 420         }
 421     }
 422
 423     //Convert other parameters
 424     if ($status) {
 425         $preferences->backup_metacourse = $backup_config->backup_sche_metacourse;
 426         $preferences->backup_users = $backup_config->backup_sche_users;
 427         $preferences->backup_logs = $backup_config->backup_sche_logs;
 428         $preferences->backup_user_files = $backup_config->backup_sche_userfiles;
 429         $preferences->backup_course_files = $backup_config->backup_sche_coursefiles;
 430         $preferences->backup_site_files = $backup_config->backup_sche_sitefiles;
 431         $preferences->backup_messages = $backup_config->backup_sche_messages;
 432         $preferences->backup_course = $course->id;
 433         $preferences->backup_destination = $backup_config->backup_sche_destination;
 434         $preferences->backup_keep = $backup_config->backup_sche_keep;
 435     }
 436
 437     //Calculate the backup string
 438     if ($status) {
 439         schedule_backup_log($starttime,$course->id,"    calculating backup name");
 440
 441         //Calculate the backup word
 442         //Take off some characters in the filename !!
 443         $takeoff = array(" ", ":", "/", "\\", "|");
 444         $backup_word = str_replace($takeoff,"_",moodle_strtolower(get_string("backupfilename")));
 445         //If non-translated, use "backup"
 446         if (substr($backup_word,0,1) == "[") {
 447             $backup_word= "backup";
 448         }
 449
 450         //Calculate the date format string
 451         $backup_date_format = str_replace(" ","_",get_string("backupnameformat"));
 452         //If non-translated, use "%Y%m%d-%H%M"
 453         if (substr($backup_date_format,0,1) == "[") {
 454             $backup_date_format = "%%Y%%m%%d-%%H%%M";
 455         }
 456
 457         //Calculate the shortname
 458         $backup_shortname = clean_filename($course->shortname);
 459         if (empty($backup_shortname) or $backup_shortname == '_' ) {
 460             $backup_shortname = $course->id;
 461         }
 462
 463         //Calculate the final backup filename
 464         //The backup word
 465         $backup_name = $backup_word."-";
 466         //The shortname
 467         $backup_name .= moodle_strtolower($backup_shortname)."-";
 468         //The date format
 469         $backup_name .= userdate(time(),$backup_date_format,99,false);
 470         //The extension
 471         $backup_name .= ".zip";
 472         //And finally, clean everything
 473         $backup_name = clean_filename($backup_name);
 474
 475         //Calculate the string to match the keep preference
 476         $keep_name = $backup_word."-";
 477         //The shortname
 478         $keep_name .= moodle_strtolower($backup_shortname)."-";
 479         //And finally, clean everything
 480         $keep_name = clean_filename($keep_name);
 481
 482         $preferences->backup_name = $backup_name;
 483         $preferences->keep_name = $keep_name;
 484     }
 485
 486     //Calculate the backup unique code to allow simultaneus backups (to define
 487     //the temp-directory name and records in backup temp tables
 488     if ($status) {
 489         $backup_unique_code = time();
 490         $preferences->backup_unique_code = $backup_unique_code;
 491     }
 492
 493     //Calculate necesary info to backup modules
 494     if ($status) {
 495         schedule_backup_log($starttime,$course->id,"    calculating modules data");
 496         if ($allmods = get_records("modules") ) {
 497             foreach ($allmods as $mod) {
 498                 $modname = $mod->name;
 499                 $modbackup = $modname."_backup_mods";
 500                 //If exists the lib & function
 501                 $var = "exists_".$modname;
 502                 if (isset($$var) && $$var) {
 503                     //Add hidden fields
 504                     $var = "backup_".$modname;
 505                     //Only if selected
 506                     if ($$var == 1) {
 507                         $var = "backup_user_info_".$modname;
 508                         //Call the check function to show more info
 509                         $modcheckbackup = $modname."_check_backup_mods";
 510                         schedule_backup_log($starttime,$course->id,"      $modname");
 511                         $modcheckbackup($course->id,$$var,$backup_unique_code);
 512                     }
 513                 }
 514             }
 515         }
 516     }
 517
 518     //Now calculate the users
 519     if ($status) {
 520         schedule_backup_log($starttime,$course->id,"    calculating users");
 521         //Decide about include users with messages, based on SITEID
 522         if ($preferences->backup_messages && $preferences->backup_course == SITEID) {
 523             $include_message_users = true;
 524         } else {
 525             $include_message_users = false;
 526         }
 527         user_check_backup($course->id,$backup_unique_code,$preferences->backup_users,$include_message_users);
 528     }
 529
 530     //Now calculate the logs
 531     if ($status) {
 532         if ($preferences->backup_logs) {
 533             schedule_backup_log($starttime,$course->id,"    calculating logs");
 534             log_check_backup($course->id);
 535         }
 536     }
 537
 538     //Now calculate the userfiles
 539     if ($status) {
 540         if ($preferences->backup_user_files) {
 541             schedule_backup_log($starttime,$course->id,"    calculating user files");
 542             user_files_check_backup($course->id,$preferences->backup_unique_code);
 543         }
 544     }
 545
 546     //Now calculate the coursefiles
 547     if ($status) {
 548        if ($preferences->backup_course_files) {
 549             schedule_backup_log($starttime,$course->id,"    calculating course files");
 550             course_files_check_backup($course->id,$preferences->backup_unique_code);
 551         }
 552     }
 553
 554     //Now calculate the sitefiles
 555     if ($status) {
 556        if ($preferences->backup_site_files) {
 557             schedule_backup_log($starttime,$course->id,"    calculating site files");
 558             site_files_check_backup($course->id,$preferences->backup_unique_code);
 559         }
 560     }
 561
 562     //If everything is ok, return calculated preferences
 563     if ($status) {
 564         $status = $preferences;
 565     }
 566
 567     return $status;
 568 }
 569
 570 //This function implements all the needed code to backup a course
 571 //copying it to the desired destination (default if not specified)
 572 function schedule_backup_course_execute($preferences,$starttime = 0) {
 573
 574     global $CFG;
 575
 576     $status = true;
 577
 578     //Another Info to add
 579     $preferences->moodle_version = $CFG->version;
 580     $preferences->moodle_release = $CFG->release;
 581     $preferences->backup_version = $CFG->backup_version;
 582     $preferences->backup_release = $CFG->backup_release;
 583
 584     //Some parts of the backup doesn't know about $preferences, so we
 585     //put a copy of it inside that CFG (always global) to be able to
 586     //use it. Then, when needed I search for preferences inside CFG
 587     //Used to avoid some problems in full_tag() when preferences isn't
 588     //set globally (i.e. in scheduled backups)
 589     $CFG->backup_preferences = $preferences;
 590
 591     //Check for temp and backup and backup_unique_code directory
 592     //Create them as needed
 593     schedule_backup_log($starttime,$preferences->backup_course,"    checking temp structures");
 594     $status = check_and_create_backup_dir($preferences->backup_unique_code);
 595     //Empty backup dir
 596     if ($status) {
 597         schedule_backup_log($starttime,$preferences->backup_course,"    cleaning current dir");
 598         $status = clear_backup_dir($preferences->backup_unique_code);
 599     }
 600
 601     //Create the moodle.xml file
 602     if ($status) {
 603         schedule_backup_log($starttime,$preferences->backup_course,"    creating backup file");
 604         //Obtain the xml file (create and open) and print prolog information
 605         $backup_file = backup_open_xml($preferences->backup_unique_code);
 606         //Prints general info about backup to file
 607         if ($backup_file) {
 608             schedule_backup_log($starttime,$preferences->backup_course,"      general info");
 609             $status = backup_general_info($backup_file,$preferences);
 610         } else {
 611             $status = false;
 612         }
 613
 614         //Prints course start (tag and general info)
 615         if ($status) {
 616             $status = backup_course_start($backup_file,$preferences);
 617         }
 618
 619         //Metacourse information
 620         if ($status && $preferences->backup_metacourse) {
 621             schedule_backup_log($starttime,$preferences->backup_course,"      metacourse info");
 622             $status = backup_course_metacourse($backup_file,$preferences);
 623         }
 624
 625         //Block info
 626         if ($status) {
 627             schedule_backup_log($starttime,$preferences->backup_course,"      blocks info");
 628             $status = backup_course_blocks($backup_file,$preferences);
 629         }
 630
 631         //Section info
 632         if ($status) {
 633             schedule_backup_log($starttime,$preferences->backup_course,"      sections info");
 634             $status = backup_course_sections($backup_file,$preferences);
 635         }
 636
 637         //User info
 638         if ($status) {
 639             schedule_backup_log($starttime,$preferences->backup_course,"      user info");
 640             $status = backup_user_info($backup_file,$preferences);
 641         }
 642
 643         //If we have selected to backup messages and we are
 644         //doing a SITE backup, let's do it
 645         if ($status && $preferences->backup_messages && $preferences->backup_course == SITEID) {
 646             schedule_backup_log($starttime,$preferences->backup_course,"      messages");
 647             if (!$status = backup_messages($backup_file,$preferences)) {
 648                 notify("An error occurred while backing up messages");
 649             }
 650         }
 651
 652         //If we have selected to backup quizzes, backup categories and
 653         //questions structure (step 1). See notes on mod/quiz/backuplib.php
 654         if ($status and $preferences->mods['quiz']->backup) {
 655             schedule_backup_log($starttime,$preferences->backup_course,"      categories & questions");
 656             $status = backup_question_categories($backup_file,$preferences);
 657         }
 658
 659         //Print logs if selected
 660         if ($status) {
 661             if ($preferences->backup_logs) {
 662                 schedule_backup_log($starttime,$preferences->backup_course,"      logs");
 663                 $status = backup_log_info($backup_file,$preferences);
 664             }
 665         }
 666
 667         //Print scales info
 668         if ($status) {
 669             schedule_backup_log($starttime,$preferences->backup_course,"      scales");
 670             $status = backup_scales_info($backup_file,$preferences);
 671         }
 672
 673         //Print groups info
 674         if ($status) {
 675             schedule_backup_log($starttime,$preferences->backup_course,"      groups");
 676             $status = backup_groups_info($backup_file,$preferences);
 677         }
 678
 679         //Print events info
 680         if ($status) {
 681             schedule_backup_log($starttime,$preferences->backup_course,"      events");
 682             $status = backup_events_info($backup_file,$preferences);
 683         }
 684
 685         //Print gradebook info
 686         if ($status) {
 687             schedule_backup_log($starttime,$preferences->backup_course,"      gradebook");
 688             $status = backup_gradebook_info($backup_file,$preferences);
 689         }
 690
 691         //Module info, this unique function makes all the work!!
 692         //db export and module fileis copy
 693         if ($status) {
 694             $mods_to_backup = false;
 695             //Check if we have any mod to backup
 696             foreach ($preferences->mods as $module) {
 697                 if ($module->backup) {
 698                     $mods_to_backup = true;
 699                 }
 700             }
 701             //If we have to backup some module
 702             if ($mods_to_backup) {
 703                 schedule_backup_log($starttime,$preferences->backup_course,"      modules");
 704                 //Start modules tag
 705                 $status = backup_modules_start ($backup_file,$preferences);
 706                 //Iterate over modules and call backup
 707                 foreach ($preferences->mods as $module) {
 708                     if ($module->backup and $status) {
 709                         schedule_backup_log($starttime,$preferences->backup_course,"        $module->name");
 710                         $status = backup_module($backup_file,$preferences,$module->name);
 711                     }
 712                 }
 713                 //Close modules tag
 714                 $status = backup_modules_end ($backup_file,$preferences);
 715             }
 716         }
 717
 718         //Prints course end
 719         if ($status) {
 720             $status = backup_course_end($backup_file,$preferences);
 721         }
 722
 723         //Close the xml file and xml data
 724         if ($backup_file) {
 725             backup_close_xml($backup_file);
 726         }
 727     }
 728
 729     //Now, if selected, copy user files
 730     if ($status) {
 731         if ($preferences->backup_user_files) {
 732             schedule_backup_log($starttime,$preferences->backup_course,"    copying user files");
 733             $status = backup_copy_user_files ($preferences);
 734         }
 735     }
 736
 737     //Now, if selected, copy course files
 738     if ($status) {
 739         if ($preferences->backup_course_files) {
 740             schedule_backup_log($starttime,$preferences->backup_course,"    copying course files");
 741             $status = backup_copy_course_files ($preferences);
 742         }
 743     }
 744
 745     //Now, if selected, copy site files
 746     if ($status) {
 747         if ($preferences->backup_site_files) {
 748             schedule_backup_log($starttime,$preferences->backup_course,"    copying site files");
 749             $status = backup_copy_site_files ($preferences);
 750         }
 751     }
 752
 753     //Now, zip all the backup directory contents
 754     if ($status) {
 755         schedule_backup_log($starttime,$preferences->backup_course,"    zipping files");
 756         $status = backup_zip ($preferences);
 757     }
 758
 759     //Now, copy the zip file to course directory
 760     if ($status) {
 761         schedule_backup_log($starttime,$preferences->backup_course,"    copying backup");
 762         $status = copy_zip_to_course_dir ($preferences);
 763     }
 764
 765     //Now, clean temporary data (db and filesystem)
 766     if ($status) {
 767         schedule_backup_log($starttime,$preferences->backup_course,"    cleaning temp data");
 768         $status = clean_temp_data ($preferences);
 769     }
 770
 771     //Unset CFG->backup_preferences only needed in scheduled backups
 772     unset ($CFG->backup_preferences);
 773
 774     return $status;
 775 }
 776
 777 //This function deletes old backup files when the "keep" limit has been reached
 778 //in the destination directory.
 779 function schedule_backup_course_delete_old_files($preferences,$starttime=0) {
 780
 781     global $CFG;
 782
 783     $status = true;
 784
 785     //Calculate the directory to check
 786     $dirtocheck = "";
 787     //if $preferences->backup_destination isn't empty, then check that directory
 788     if (!empty($preferences->backup_destination)) {
 789         $dirtocheck = $preferences->backup_destination;
 790     //else calculate standard backup directory location
 791     } else {
 792         $dirtocheck = $CFG->dataroot."/".$preferences->backup_course."/backupdata";
 793     }
 794     schedule_backup_log($starttime,$preferences->backup_course,"    checking $dirtocheck");
 795     if ($CFG->debug > 7) {
 796         mtrace("            Keeping backup files in $dirtocheck");
 797     }
 798
 799     //Get all the files in $dirtocheck
 800     $files = get_directory_list($dirtocheck,"",false);
 801     //Get all matching files ($preferences->keep_name) from $files
 802     $matchingfiles = array();
 803     foreach ($files as $file) {
 804         if (substr($file, 0, strlen($preferences->keep_name)) == $preferences->keep_name) {
 805             $modifieddate = filemtime($dirtocheck."/".$file);
 806             $matchingfiles[$modifieddate] = $file;
 807         }
 808     }
 809     //Sort by key (modified date) to get the oldest first (instead of doing that by name
 810     //because it could give us problems in some languages with different format names).
 811     ksort($matchingfiles);
 812
 813     //Count matching files
 814     $countmatching = count($matchingfiles);
 815     schedule_backup_log($starttime,$preferences->backup_course,"        found $countmatching backup files");
 816     mtrace("                found $countmatching backup files");
 817     if ($preferences->backup_keep < $countmatching) {
 818         schedule_backup_log($starttime,$preferences->backup_course,"        keep limit ($preferences->backup_keep) reached. Deleting old files");
 819         mtrace("                keep limit ($preferences->backup_keep) reached. Deleting old files");
 820         $filestodelete = $countmatching - $preferences->backup_keep;
 821         $filesdeleted = 0;
 822         foreach ($matchingfiles as $matchfile) {
 823             if ($filesdeleted < $filestodelete) {
 824                 schedule_backup_log($starttime,$preferences->backup_course,"        $matchfile deleted");
 825                 mtrace("                $matchfile deleted");
 826                 $filetodelete = $dirtocheck."/".$matchfile;
 827                 unlink($filetodelete);
 828                 $filesdeleted++;
 829             }
 830         }
 831     }
 832     return $status;
 833 }
 834
 835 ?>