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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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