DiffusionMercurialCommandEngine.php
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DiffusionMercurialCommandEngine.php
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	<?php

	final class DiffusionMercurialCommandEngine
	extends DiffusionCommandEngine {

	protected function canBuildForRepository(
	PhabricatorRepository $repository) {
	return $repository->isHg();
	}

	protected function newFormattedCommand($pattern, array $argv) {
	$args = array();

	// NOTE: Here, and in Git and Subversion, we override the SSH command even
	// if the repository does not use an SSH remote, since our SSH wrapper
	// defuses an attack against older versions of Mercurial, Git and
	// Subversion (see T12961) and it's possible to execute this attack
	// in indirect ways, like by using an SSH subrepo inside an HTTP repo.

	$pattern = "hg --config ui.ssh=%s {$pattern}";
	$args[] = $this->getSSHWrapper();

	return array($pattern, array_merge($args, $argv));
	}

	protected function newCustomEnvironment() {
	$env = array();

	// NOTE: This overrides certain configuration, extensions, and settings
	// which make Mercurial commands do random unusual things.
	$env['HGPLAIN'] = 1;

	return $env;
	}

	/**
	* Sanitize output of an `hg` command invoked with the `--debug` flag to make
	* it usable.
	*
	* @param string Output from `hg --debug ...`
	* @return string Usable output.
	*/
	public static function filterMercurialDebugOutput($stdout) {
	// When hg commands are run with `--debug` and some config file isn't
	// trusted, Mercurial prints out a warning to stdout, twice, after Feb 2011.
	//
	// http://selenic.com/pipermail/mercurial-devel/2011-February/028541.html
	//
	// After Jan 2015, it may also fail to write to a revision branch cache.

	$ignore = array(
	'ignoring untrusted configuration option',
	"couldn't write revision branch cache:",
	);

	foreach ($ignore as $key => $pattern) {
	$ignore[$key] = preg_quote($pattern, '/');
	}

	$ignore = '('.implode('\|', $ignore).')';

	$lines = preg_split('/(?<=\n)/', $stdout);
	$regex = '/'.$ignore.'.*\n$/';

	foreach ($lines as $key => $line) {
	$lines[$key] = preg_replace($regex, '', $line);
	}

	return implode('', $lines);
	}

	}

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