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

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narrowpatch.py
41 lines | 1.5 KiB | text/x-python | PythonLexer
# narrowpatch.py - extensions to mercurial patch module to support narrow clones
#
# Copyright 2017 Google, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from __future__ import absolute_import
from mercurial import (
extensions,
patch,
)
def setup(repo):
def _filepairs(orig, *args):
"""Only includes files within the narrow spec in the diff."""
narrowmatch = repo.narrowmatch()
if not narrowmatch.always():
for x in orig(*args):
f1, f2, copyop = x
if ((not f1 or narrowmatch(f1)) and
(not f2 or narrowmatch(f2))):
yield x
else:
for x in orig(*args):
yield x
def trydiff(orig, repo, revs, ctx1, ctx2, modified, added, removed,
copy, getfilectx, *args, **kwargs):
narrowmatch = repo.narrowmatch()
if not narrowmatch.always():
modified = [f for f in modified if narrowmatch(f)]
added = [f for f in added if narrowmatch(f)]
removed = [f for f in removed if narrowmatch(f)]
copy = {k: v for k, v in copy.iteritems() if narrowmatch(k)}
return orig(repo, revs, ctx1, ctx2, modified, added, removed, copy,
getfilectx, *args, **kwargs)
extensions.wrapfunction(patch, '_filepairs', _filepairs)
extensions.wrapfunction(patch, 'trydiff', trydiff)