testing

20170410.calendar.01.repair.php
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			<?php

			// See T12488. Some events survived "20161004.cal.01.noepoch.php" without
			// having "utcInstanceEpoch" computed, which breaks ICS export. This appears
			// to be the result of some bug which has been fixed in the meantime, so just
			// redo this part of the migration.

			$table = new PhabricatorCalendarEvent();
			$conn = $table->establishConnection('w');
			$table_name = $table->getTableName();

			$viewer = PhabricatorUser::getOmnipotentUser();
			$all_events = id(new PhabricatorCalendarEventQuery())
			->setViewer($viewer)
			->execute();
			foreach ($all_events as $event) {
			$id = $event->getID();

			if (!$event->getInstanceOfEventPHID()) {
			// Not a child event, so no instance epoch.
			continue;
			}

			if ($event->getUTCInstanceEpoch()) {
			// Already has an instance epoch.
			continue;
			}

			try {
			$event->updateUTCEpochs();
			} catch (Exception $ex) {
			phlog($ex);
			continue;
			}

			queryfx(
			$conn,
			'UPDATE %T SET utcInstanceEpoch = %nd WHERE id = %d',
			$table_name,
			$event->getUTCInstanceEpoch(),
			$id);
			}