Comment 3 for bug 589532

We think this is due to this code:

        proc = subprocess.Popen("import_package.py %s" % self.package,
            shell=True, stdout=subprocess.PIPE,
            stderr=subprocess.STDOUT, stdin=subprocess.PIPE,
            preexec_fn=subprocess_setup)
        proc.stdin.close()
        while proc.poll() is None:
            if self.should_stop.isSet():
                os.kill(proc.pid, signal.SIGTERM)
            time.sleep(1)
        output = proc.stdout.read()

if the subprocess writes lots of output then it will buffer and hang, and we won't consume
until it ends, causing a deadlock.

We can't simply read() within the loop, as we don't want to block, so using select() is
probably the quick fix for this.

It's another plus for using LP's job system/ampoule/celery/something though.

Thanks,

James