PhagePHPAgentBootloader.php
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	<?php

	final class PhagePHPAgentBootloader extends PhageAgentBootloader {

	private $bootSequence;
	private $bootLength;
	private $mainLength;

	public function getName() {
	return 'php';
	}

	public function getBootCommand() {
	$this->buildBootSequence();
	$len = $this->bootLength;

	// We need to run a command which will bootload a full agent by reading
	// and evaluating source code from stdin. This is the smallest bootstrap
	// I was able to construct:
	//
	// - Using `fread(STDIN, ...)` is only good up to 8192 bytes.
	// - Using `fread(STDIN, ...)` or various other constructs prevents us
	// from opening STDIN later.
	//
	// Instead, we `fread()` a second-stage bootstrap which has enough code
	// to do arbitrary-length reads from stdin. The second-stage bootstrap
	// reads and evaluates the main agent program.

	return csprintf(
	'php -r %s',
	"eval(fread(\$I=fopen('php://stdin', 'r'), {$len})); /* phage! */");
	}

	public function getBootSequence() {
	$boot = $this->buildBootSequence();
	return $boot->toString();
	}

	private function buildBootSequence() {
	if (!$this->bootSequence) {
	$files = array(
	'utils/utils.php',
	'object/Phobject.php',
	'utils/PhutilRope.php',
	'xsprintf/xsprintf.php',
	'xsprintf/csprintf.php',
	'xsprintf/PhutilCommandString.php',
	'future/Future.php',
	'future/FutureIterator.php',
	'future/FuturePool.php',
	'future/exec/PhutilExecutableFuture.php',
	'future/exec/ExecFuture.php',
	'future/exec/CommandException.php',
	'channel/PhutilChannel.php',
	'channel/PhutilSocketChannel.php',
	'channel/PhutilChannelChannel.php',
	'channel/PhutilProtocolChannel.php',
	'channel/PhutilJSONProtocolChannel.php',
	'phage/agent/PhagePHPAgent.php',
	);

	$main_sequence = new PhutilBallOfPHP();
	$root = phutil_get_library_root('arcanist');
	foreach ($files as $file) {
	$main_sequence->addFile($root.'/'.$file);
	}

	// NOTE: If we use id() here, we don't get a stack trace out of it when
	// we call a nonexistent method from inside "execute()"? Not exactly sure
	// what's going on here, but just sweep it under the rug for now.

	$main_sequence->addText('$A = new PhagePHPAgent($I); $A->execute();');
	$main_length = strlen($main_sequence->toString());

	$boot_sequence = new PhutilBallOfPHP();
	$boot = '
	$length = '.$main_length.';
	$buffer = "";
	while (strlen($buffer) < $length) {
	$data = fread($I, $length - strlen($buffer));
	if (!strlen($data)) {
	exit(1);
	}
	$buffer .= $data;
	}

	eval($buffer);';
	$boot_sequence->addText($boot);
	$boot_length = strlen($boot_sequence->toString());
	$boot_sequence->addText($main_sequence->toString());

	if (strlen($boot_length) > 8192) {
	throw new Exception(pht('Stage 1 bootloader is too large!'));
	}

	$this->bootSequence = $boot_sequence;
	$this->bootLength = $boot_length;
	$this->mainLength = $main_length;
	}

	return $this->bootSequence;
	}

	}

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