20170316.rawfiles.01.php
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	<?php

	// Previously, files generated by "View Raw File" were written as permanent
	// files with excessively wide view permissions. This destroys these files
	// so they are recreated as temporary files with correct permissions when
	// next accessed.

	$table = new DifferentialChangeset();
	$conn = $table->establishConnection('w');
	$viewer = PhabricatorUser::getOmnipotentUser();

	$iterator = new LiskRawMigrationIterator(
	$conn,
	$table->getTableName());

	echo tsprintf(
	"%s\n",
	pht('Purging old raw changeset file caches...'));

	$keys = array(
	'raw:new:phid',
	'raw:old:phid',
	);

	foreach ($iterator as $changeset) {
	try {
	$metadata = phutil_json_decode($changeset['metadata']);

	$phids = array();
	foreach ($keys as $key) {
	if (isset($metadata[$key])) {
	$phids[] = $metadata[$key];
	}
	}

	foreach ($phids as $phid) {
	$file = id(new PhabricatorFileQuery())
	->setViewer($viewer)
	->withPHIDs(array($phid))
	->executeOne();
	if ($file) {
	id(new PhabricatorDestructionEngine())
	->destroyObject($file);
	}
	}

	// NOTE: We don't bother updating the changeset record itself: we already
	// regenerate the cache properly if the stored value isn't valid.

	} catch (Exception $ex) {
	// Just move on if we run into trouble.
	}
	}