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phorge-arcanist/support/init/init-script.php
epriestley e95afd1d00 Apply "pcre.*_limit" config options at startup in CLI environments
Summary:
Ref T13100. Ref T13586. These options have been in production for a while and seem to consistently improve behavior, downgrading segfaults to runtime errors.

Make them global options for all CLI environments. See next change for web enviornments.

Test Plan: Ran `arc`.

Maniphest Tasks: T13586, T13100

Differential Revision: https://secure.phabricator.com/D21566
2021-02-19 11:16:09 -08:00

131 lines
5.1 KiB
PHP

<?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,
// See T13296. On macOS under PHP 7.3.x, PCRE currently segfaults after
// "fork()" if "pcre.jit" is enabled.
'pcre.jit' => 0,
// See PHI1894. This option was introduced in PHP 7.4, and removes the
// "args" value from exception backtraces. We have some unit tests which
// inspect "args", and this option generally obscures useful debugging
// information without any benefit in the context of Phabricator.
'zend.exception_ignore_args' => 0,
// See T13100. We'd like the regex engine to fail, rather than segfault,
// if handed a pathological regular expression.
'pcre.backtrack_limit' => 10000,
'pcre.recusion_limit' => 10000,
// NOTE: Phabricator applies a similar set of startup options for Web
// environments in "PhabricatorStartup". Changes here may also be
// appropriate to apply there.
);
foreach ($config_map as $config_key => $config_value) {
ini_set($config_key, $config_value);
}
$php_version = phpversion();
$min_version = '5.5.0';
if (version_compare($php_version, $min_version, '<')) {
echo sprintf(
'UPGRADE PHP: '.
'The installed version of PHP ("%s") is too old to run Arcanist. '.
'Update PHP to at least the minimum required version ("%s").',
$php_version,
$min_version);
echo "\n";
exit(1);
}
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.
// PHP 8 deprecates this function and disables this by default; remove once
// PHP 7 is no longer supported or a future version has removed the function
// entirely.
if (function_exists('libxml_disable_entity_loader')) {
@libxml_disable_entity_loader(true);
}
$root = dirname(dirname(dirname(__FILE__)));
require_once $root.'/src/init/init-library.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__();