view hgext/fsmonitor/watchmanclient.py @ 41557:3a01ce246ece

commit: ignore diff whitespace settings when doing `commit -i` (issue5839)

Previously, we respected options like `diff.ignoreblanklines` and
`diff.ignorews`.  This can cause problems when the user is attempting to
actually commit the blank line change. Specifically, the split extension can get
into an infinite loop because it detects that the working copy is not clean, but
when we get the diff we don't see the changes, so it just skips popping up the
chunk selection flow, saying there's no changes to record.

These options are primarily meant for viewing diffs; it is highly unlikely that
someone is actually intending to add extraneous whitespace and have it ignored
if they attempt to interactively commit (but *not* ignored if they
non-interactively commit).

Differential Revision: https://phab.mercurial-scm.org/D5744

# watchmanclient.py - Watchman client for the fsmonitor extension
#
# Copyright 2013-2016 Facebook, 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

import getpass

from mercurial import util

from . import pywatchman

class Unavailable(Exception):
    def __init__(self, msg, warn=True, invalidate=False):
        self.msg = msg
        self.warn = warn
        if self.msg == 'timed out waiting for response':
            self.warn = False
        self.invalidate = invalidate

    def __str__(self):
        if self.warn:
            return 'warning: Watchman unavailable: %s' % self.msg
        else:
            return 'Watchman unavailable: %s' % self.msg

class WatchmanNoRoot(Unavailable):
    def __init__(self, root, msg):
        self.root = root
        super(WatchmanNoRoot, self).__init__(msg)

class client(object):
    def __init__(self, repo, timeout=1.0):
        err = None
        if not self._user:
            err = "couldn't get user"
            warn = True
        if self._user in repo.ui.configlist('fsmonitor', 'blacklistusers'):
            err = 'user %s in blacklist' % self._user
            warn = False

        if err:
            raise Unavailable(err, warn)

        self._timeout = timeout
        self._watchmanclient = None
        self._root = repo.root
        self._ui = repo.ui
        self._firsttime = True

    def settimeout(self, timeout):
        self._timeout = timeout
        if self._watchmanclient is not None:
            self._watchmanclient.setTimeout(timeout)

    def getcurrentclock(self):
        result = self.command('clock')
        if not util.safehasattr(result, 'clock'):
            raise Unavailable('clock result is missing clock value',
                              invalidate=True)
        return result.clock

    def clearconnection(self):
        self._watchmanclient = None

    def available(self):
        return self._watchmanclient is not None or self._firsttime

    @util.propertycache
    def _user(self):
        try:
            return getpass.getuser()
        except KeyError:
            # couldn't figure out our user
            return None

    def _command(self, *args):
        watchmanargs = (args[0], self._root) + args[1:]
        try:
            if self._watchmanclient is None:
                self._firsttime = False
                self._watchmanclient = pywatchman.client(
                    timeout=self._timeout,
                    useImmutableBser=True)
            return self._watchmanclient.query(*watchmanargs)
        except pywatchman.CommandError as ex:
            if 'unable to resolve root' in ex.msg:
                raise WatchmanNoRoot(self._root, ex.msg)
            raise Unavailable(ex.msg)
        except pywatchman.WatchmanError as ex:
            raise Unavailable(str(ex))

    def command(self, *args):
        try:
            try:
                return self._command(*args)
            except WatchmanNoRoot:
                # this 'watch' command can also raise a WatchmanNoRoot if
                # watchman refuses to accept this root
                self._command('watch')
                return self._command(*args)
        except Unavailable:
            # this is in an outer scope to catch Unavailable form any of the
            # above _command calls
            self._watchmanclient = None
            raise