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phorge-arcanist/scripts/utils/lock.php
epriestley 8e0e07664a [Wilds] Remove libphutil
Summary:
Ref T13098. Historically, Phabricator was split into three parts:

  - Phabricator, the server.
  - Arcanist, the client.
  - libphutil, libraries shared between the client and server.

One imagined use case for this was that `libphutil` might become a general-purpose library that other projects would use.

However, this didn't really happen, and it seems unlikely to at this point: Phabricator has become a relatively more sophisticated application platform; we didn't end up seeing or encouraging much custom development; what custom development there is basically embraces all of Phabricator since there are huge advantages to doing so; and a general "open source is awful" sort of factor here in the sense that open source users often don't have goals well aligned to our goals.

Turning "arc" into a client platform and building package management solidify us in this direction of being a standalone platform, not a standalone utility library.

Phabricator also depends on `arcanist/`. If it didn't, there would be a small advantage to saying "shared code + client for client, shared code + server for server", but there's no such distinction and it seems unlikely that one will ever exist. Even if it did, I think this has little value.

Nowadays, I think this separation has no advantages for us and one significant cost: it makes installing `arcanist` more difficult for end-users.

This will need some more finesssing (Phabricator will need some changes for compatibility, and a lot of stuff that still says "libphutil" or "phutil" may eventually want to say "arcanist"), and some stuff (like xhpast) is probably straight-up broken right now and needs some tweaking, but I don't anticipate any major issues here. There was never anything particularly magical about libphutil as a separate standalone library.

Test Plan: Ran `arc`, it gets about as far as it did before.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13098

Differential Revision: https://secure.phabricator.com/D19688
2018-09-21 16:38:53 -07:00

82 lines
1.7 KiB
PHP
Executable file

#!/usr/bin/env php
<?php
require_once dirname(__FILE__).'/../__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);