view tests/test-minifileset.py @ 37212:f09a2eab11cf

server: add an error feedback mechanism for when the daemon fails to launch

There's a recurring problem on Windows where `hg serve -d` will randomly fail to
spawn a detached process.  The reason for the failure is completely hidden, and
it takes hours to get a single failure on my laptop.  All this does is redirect
stdout/stderr of the child to a file until the lock file is freed, and then the
parent dumps it out if it fails to spawn.

I chose to put the output into the lock file because that is always cleaned up.
There's no way to report errors after that anyway.  On Windows, killdaemons.py
is roughly `kill -9`, so this ensures that junk won't pile up.

This may end up being a case of EADDRINUSE.  At least that's what I saw spit out
a few times (among other odd errors and missing output on Windows).  But I also
managed to get the same thing on Fedora 26 by running test-hgwebdir.t with
--loop -j10 for several hours.  Running `netstat` immediately after killing that
run printed a wall of sockets in the TIME_WAIT state, which were gone a couple
seconds later.  I couldn't match up ports that failed, because --loop doesn't
print out the message about the port that was used.  So maybe the fix is to
rotate the use of HGPORT[12] in the tests.  But, let's collect some more data
first.

from __future__ import absolute_import
from __future__ import print_function

import os
import sys

# make it runnable directly without run-tests.py
sys.path[0:0] = [os.path.join(os.path.dirname(__file__), '..')]

from mercurial import minifileset

def check(text, truecases, falsecases):
    f = minifileset.compile(text)
    for args in truecases:
        if not f(*args):
            print('unexpected: %r should include %r' % (text, args))
    for args in falsecases:
        if f(*args):
            print('unexpected: %r should exclude %r' % (text, args))

check('all()', [('a.php', 123), ('b.txt', 0)], [])
check('none()', [], [('a.php', 123), ('b.txt', 0)])
check('!!!!((!(!!all())))', [], [('a.php', 123), ('b.txt', 0)])

check('"path:a" & (**.b | **.c)', [('a/b.b', 0), ('a/c.c', 0)], [('b/c.c', 0)])
check('(path:a & **.b) | **.c',
      [('a/b.b', 0), ('a/c.c', 0), ('b/c.c', 0)], [])

check('**.bin - size("<20B")', [('b.bin', 21)], [('a.bin', 11), ('b.txt', 21)])

check('!!**.bin or size(">20B") + "path:bin" or !size(">10")',
      [('a.bin', 11), ('b.txt', 21), ('bin/abc', 11)],
      [('a.notbin', 11), ('b.txt', 11), ('bin2/abc', 11)])

check('(**.php and size(">10KB")) | **.zip | ("path:bin" & !"path:bin/README") '
      ' | size(">1M")',
      [('a.php', 15000), ('a.zip', 0), ('bin/a', 0), ('bin/README', 1e7)],
      [('a.php', 5000), ('b.zip2', 0), ('t/bin/a', 0), ('bin/README', 1)])