Ergonomic, hermetic, user-friendly software build system for Python, Go, Java, Kotlin, Protobuf, Scala, Shell. Pants lets you fearlessly scale up your codebase!

Pants

Only the blocking will be a context manager

```@contextmanager
def owner_printing_file_lock(path):
  lock = InterProcessLock(path)

  lock.acquire(blocking=False)

  if not lock.acquired:
    with open(lock.path, 'rb') as f:
      lockfile_contents = f.read().decode('utf-8', 'replace')
      print('Waiting on pants process to complete: {}'.format(lockfile_contents), file=sys.stderr)
    lock.acquire()

  with open(lock.path, 'wb') as f:
    current_process = psutil.Process()
    message = '{} ({})'.format(current_process.pid, ' '.join(current_process.cmdline()))
    f.write(message.encode('utf-8'))
  yield lock
  with open(lock.path, 'w'):
    pass

  lock.release()
```

If that's the case we need to propagate an exception, really

In which case the user can just use `InterProcessLock` themselves

None of our internal uses use timeouts anyway

qq for everyone.  I’m trying to write an integ test that creates a BUILD.tools file and then runs some scala compile etc.  Anyone have any ideas on how to generate the BUILD.tools file on the fly for the integ test?

<https://rbcommons.com/s/twitter/r/3600/> might have an example shortly.

I assume I can create something like BUILD.IntegTest so I don’t mess with BUILD.tools

sidenote: no need for it to be named `*.tools`

that answers my second question then :simple_smile:

er, so if that's the reason why you thought you needed to rename it, that's probably not necessary.

not for bootstrapped tools… they need to point at the root

`//:blah` is a target named blah at the root

could point at `testprojects:blah` instead

might be interesting to have a "default prefix" for bootstrap tools

I see there are places in scala_platform that I currently have // as part of the spec, I suppose I could change that… it would make it much easier to test.

...right after saying that, i realized that probably runs into the bootstrap problem of "can't use an option to set the default value of an option"