public function backup_migrate_schedule::smart_delete_backups in Backup and Migrate 7.3

Same name and namespace in other branches

1. 8.3 includes/schedules.inc \backup_migrate_schedule::smart_delete_backups()
2. 6.3 includes/schedules.inc \backup_migrate_schedule::smart_delete_backups()

Delete files keeping the specified number of hourly, daily, weekly and monthly backups.

1 call to backup_migrate_schedule::smart_delete_backups()

backup_migrate_schedule::remove_expired_backups in includes/schedules.inc

Remove older backups keeping only the number specified by the aministrator.

File

includes/schedules.inc, line 783

All of the schedule handling code needed for Backup and Migrate.

Class

backup_migrate_schedule

A schedule class for crud operations.

Code

public function smart_delete_backups($destination, $files, $keep_subhourly = 3600, $keep_hourly = 24, $keep_daily = 14, $keep_weekly = PHP_INT_MAX, $keep_monthly = PHP_INT_MAX) {

  // Each period must be an exact multiple of the next smallest period.
  $now = time();
  $periods = array(
    'subhourly' => array(
      'delta' => 1,
      'keep' => $keep_subhourly,
      'last_time' => 0,
      'files' => array(),
    ),
    'hourly' => array(
      'delta' => 60 * 60,
      'keep' => $keep_hourly,
      'last_time' => 0,
      'files' => array(),
    ),
    'daily' => array(
      'delta' => 60 * 60 * 24,
      'keep' => $keep_daily,
      'last_time' => 0,
      'files' => array(),
    ),
    'weekly' => array(
      'delta' => 60 * 60 * 24 * 7,
      'keep' => $keep_weekly,
      'last_time' => 0,
      'files' => array(),
    ),
  );
  $keep_files = $filetimes = $times = $groups = $sorted = $saved = array();
  foreach ($files as $id => $file) {
    if ($file
      ->is_recognized_type()) {
      $time = $file
        ->info('filetime');
      $sorted[$id] = $time;
    }
  }

  // Sort files, oldest first.
  asort($sorted);

  // Reset internal pointer and get the oldest file time.
  $oldest_file_time = reset($sorted);

  // Save the oldest file.
  $keep_files[key($sorted)] = key($sorted);
  foreach ($periods as $i => $period) {
    $period_keep_files = array();
    $time = $oldest_file_time;

    // Set time from which we start saving files.
    $period_start_time = $now - ($period['keep'] + 1) * $period['delta'];

    // Increase time to within one period time span of the period start
    // time. This keeps all the different period starts aligned.
    if ($time < $period_start_time) {
      $time += (int) ceil(($period_start_time - $time) / $period['delta']) * $period['delta'];
    }
    $file_id = $this
      ->find_nearest_file($sorted, $time);
    do {
      $period_keep_files[$file_id] = $file_id;
      $last_file_id = $file_id;
      $time += $period['delta'];
      $file_id = $this
        ->find_nearest_file($sorted, $time);
    } while ($time < $now);
    $keep_files = array_merge($keep_files, $period_keep_files);
  }

  // Do the delete.
  foreach ($files as $id => $file) {
    if (!isset($keep_files[$id])) {
      $destination
        ->delete_file($file
        ->file_id());
    }
  }
}