init-script.php
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init-script.php
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	<?php

	function __arcanist_init_script__() {
	// Adjust the runtime language configuration to be reasonable and inline with
	// expectations. We do this first, then load libraries.

	// There may be some kind of auto-prepend script configured which starts an
	// output buffer. Discard any such output buffers so messages can be sent to
	// stdout (if a user wants to capture output from a script, there are a large
	// number of ways they can accomplish it legitimately; historically, we ran
	// into this on only one install which had some bizarre configuration, but it
	// was difficult to diagnose because the symptom is "no messages of any
	// kind").
	while (ob_get_level() > 0) {
	ob_end_clean();
	}

	error_reporting(E_ALL \| E_STRICT);

	$config_map = array(
	// Always display script errors. Without this, they may not appear, which is
	// unhelpful when users encounter a problem. On the web this is a security
	// concern because you don't want to expose errors to clients, but in a
	// script context we always want to show errors.
	'display_errors' => true,

	// Send script error messages to the server's `error_log` setting.
	'log_errors' => true,

	// Set the error log to the default, so errors go to stderr. Without this
	// errors may end up in some log, and users may not know where the log is
	// or check it.
	'error_log' => null,

	// XDebug raises a fatal error if the call stack gets too deep, but the
	// default setting is 100, which we may exceed legitimately with module
	// includes (and in other cases, like recursive filesystem operations
	// applied to 100+ levels of directory nesting). Stop it from triggering:
	// we explicitly limit recursive algorithms which should be limited.
	//
	// After Feb 2014, XDebug interprets a value of 0 to mean "do not allow any
	// function calls". Previously, 0 effectively disabled this check. For
	// context, see T5027.
	'xdebug.max_nesting_level' => PHP_INT_MAX,

	// Don't limit memory, doing so just generally just prevents us from
	// processing large inputs without many tangible benefits.
	'memory_limit' => -1,
	);

	foreach ($config_map as $config_key => $config_value) {
	ini_set($config_key, $config_value);
	}

	if (!ini_get('date.timezone')) {
	// If the timezone isn't set, PHP issues a warning whenever you try to parse
	// a date (like those from Git or Mercurial logs), even if the date contains
	// timezone information (like "PST" or "-0700") which makes the
	// environmental timezone setting is completely irrelevant. We never rely on
	// the system timezone setting in any capacity, so prevent PHP from flipping
	// out by setting it to a safe default (UTC) if it isn't set to some other
	// value.
	date_default_timezone_set('UTC');
	}

	// Adjust `include_path`.
	ini_set('include_path', implode(PATH_SEPARATOR, array(
	dirname(dirname(__FILE__)).'/externals/includes',
	ini_get('include_path'),
	)));

	// Disable the insanely dangerous XML entity loader by default.
	if (function_exists('libxml_disable_entity_loader')) {
	libxml_disable_entity_loader(true);
	}

	// Now, load the library.

	$root = dirname(dirname(dirname(__FILE__)));
	require_once $root.'/src/__phutil_library_init__.php';

	PhutilErrorHandler::initialize();

	// If "variables_order" excludes "E", silently repair it so that $_ENV has
	// the values we expect.
	PhutilExecutionEnvironment::repairMissingVariablesOrder();

	$router = PhutilSignalRouter::initialize();

	$handler = new PhutilBacktraceSignalHandler();
	$router->installHandler('phutil.backtrace', $handler);

	$handler = new PhutilConsoleMetricsSignalHandler();
	$router->installHandler('phutil.winch', $handler);
	}

	__arcanist_init_script__();

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