testing

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.
			}
			}