lock.php
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lock.php
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	#!/usr/bin/env php
	<?php

	$arcanist_root = dirname(dirname(dirname(__FILE__)));
	require_once $arcanist_root.'/support/init/init-script.php';

	$args = new PhutilArgumentParser($argv);
	$args->setTagline(pht('acquire and hold a lockfile'));
	$args->setSynopsis(<<<EOHELP
	lock.php __file__ [__options__]
	Acquire a lockfile and hold it until told to unlock it.

	EOHELP
	);

	$args->parseStandardArguments();
	$args->parse(array(
	array(
	'name' => 'test',
	'help' => pht('Instead of holding the lock, release it and exit.'),
	),
	array(
	'name' => 'hold',
	'help' => pht('Hold indefinitely without prompting.'),
	),
	array(
	'name' => 'wait',
	'param' => 'n',
	'help' => pht('Block for up to __n__ seconds waiting for the lock.'),
	'default' => 0,
	),
	array(
	'name' => 'file',
	'wildcard' => true,
	),
	));


	$file = $args->getArg('file');
	if (count($file) !== 1) {
	$args->printHelpAndExit();
	}
	$file = head($file);

	$console = PhutilConsole::getConsole();
	$console->writeOut(
	"%s\n",
	pht('This process has PID %d. Acquiring lock...', getmypid()));

	$lock = PhutilFileLock::newForPath($file);

	try {
	$lock->lock($args->getArg('wait'));
	} catch (PhutilFileLockException $ex) {
	$console->writeOut(
	"%s %s\n",
	pht('UNABLE TO ACQUIRE LOCK:'),
	pht('Lock is already held.'));
	exit(1);
	}

	// NOTE: This string is magic, the unit tests look for it.
	$console->writeOut("%s\n", pht('LOCK ACQUIRED'));
	if ($args->getArg('test')) {
	$lock->unlock();
	exit(0);
	}

	if ($args->getArg('hold')) {
	while (true) {
	sleep(1);
	}
	}

	while (!$console->confirm(pht('Release lock?'))) {
	// Keep asking until they say yes.
	}

	$console->writeOut("%s\n", pht('Unlocking...'));
	$lock->unlock();

	$console->writeOut("%s\n", pht('Done.'));
	exit(0);

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