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);
	}