mercurial/configitems.py

wireproto: implement basic frame reading and processing

We just implemented support for writing frames. Now let's implement
support for reading them.

The bulk of the new code is for a class that maintains the state of
a server. Essentially, you construct an instance, feed frames to it,
and it tells you what you should do next. The design is inspired by
the "sans I/O" movement and the reactor pattern. We don't want to
perform I/O or any major blocking event during frame ingestion because
this arbitrarily limits ways that server pieces can be implemented.
For example, it makes it much harder to swap in an alternate
implementation based on asyncio or do crazy things like have requests
dispatch to other processes.

We do still implement readframe() which does I/O. But it is decoupled
from the server reactor. And important parsing of frame headers is
a standalone function. So I/O is only needed to obtain frame data.

Because testing server-side ingest is useful and difficult on running
servers, we create a new "debugreflect" endpoint that will echo back
to the client what was received and how it was interpreted. This could
be useful for a server admin, someone implementing a client. But
immediately, it is useful for testing: we're able to demonstrate that
frames are parsed correctly and turned into requests to run commands
without having to implement command dispatch on the server!

In addition, we implement Python level unit tests for the reactor.
This is vastly more efficient than sending requests to the
"debugreflect" endpoint and vastly more powerful for advanced
testing.

Differential Revision: https://phab.mercurial-scm.org/D2852

# configitems.py - centralized declaration of configuration option
#
#  Copyright 2017 Pierre-Yves David <[e-mail]>
#
# 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 functools
import re

from . import (
    encoding,
    error,
)

def loadconfigtable(ui, extname, configtable):
    """update config item known to the ui with the extension ones"""
    for section, items in sorted(configtable.items()):
        knownitems = ui._knownconfig.setdefault(section, itemregister())
        knownkeys = set(knownitems)
        newkeys = set(items)
        for key in sorted(knownkeys & newkeys):
            msg = "extension '%s' overwrite config item '%s.%s'"
            msg %= (extname, section, key)
            ui.develwarn(msg, config='warn-config')

        knownitems.update(items)

class configitem(object):
    """represent a known config item

    :section: the official config section where to find this item,
       :name: the official name within the section,
    :default: default value for this item,
    :alias: optional list of tuples as alternatives,
    :generic: this is a generic definition, match name using regular expression.
    """

    def __init__(self, section, name, default=None, alias=(),
                 generic=False, priority=0):
        self.section = section
        self.name = name
        self.default = default
        self.alias = list(alias)
        self.generic = generic
        self.priority = priority
        self._re = None
        if generic:
            self._re = re.compile(self.name)

class itemregister(dict):
    """A specialized dictionary that can handle wild-card selection"""

    def __init__(self):
        super(itemregister, self).__init__()
        self._generics = set()

    def update(self, other):
        super(itemregister, self).update(other)
        self._generics.update(other._generics)

    def __setitem__(self, key, item):
        super(itemregister, self).__setitem__(key, item)
        if item.generic:
            self._generics.add(item)

    def get(self, key):
        baseitem = super(itemregister, self).get(key)
        if baseitem is not None and not baseitem.generic:
            return baseitem

        # search for a matching generic item
        generics = sorted(self._generics, key=(lambda x: (x.priority, x.name)))
        for item in generics:
            # we use 'match' instead of 'search' to make the matching simpler
            # for people unfamiliar with regular expression. Having the match
            # rooted to the start of the string will produce less surprising
            # result for user writing simple regex for sub-attribute.
            #
            # For example using "color\..*" match produces an unsurprising
            # result, while using search could suddenly match apparently
            # unrelated configuration that happens to contains "color."
            # anywhere. This is a tradeoff where we favor requiring ".*" on
            # some match to avoid the need to prefix most pattern with "^".
            # The "^" seems more error prone.
            if item._re.match(key):
                return item

        return None

coreitems = {}

def _register(configtable, *args, **kwargs):
    item = configitem(*args, **kwargs)
    section = configtable.setdefault(item.section, itemregister())
    if item.name in section:
        msg = "duplicated config item registration for '%s.%s'"
        raise error.ProgrammingError(msg % (item.section, item.name))
    section[item.name] = item

# special value for case where the default is derived from other values
dynamicdefault = object()

# Registering actual config items

def getitemregister(configtable):
    f = functools.partial(_register, configtable)
    # export pseudo enum as configitem.*
    f.dynamicdefault = dynamicdefault
    return f

coreconfigitem = getitemregister(coreitems)

coreconfigitem('alias', '.*',
    default=None,
    generic=True,
)
coreconfigitem('annotate', 'nodates',
    default=False,
)
coreconfigitem('annotate', 'showfunc',
    default=False,
)
coreconfigitem('annotate', 'unified',
    default=None,
)
coreconfigitem('annotate', 'git',
    default=False,
)
coreconfigitem('annotate', 'ignorews',
    default=False,
)
coreconfigitem('annotate', 'ignorewsamount',
    default=False,
)
coreconfigitem('annotate', 'ignoreblanklines',
    default=False,
)
coreconfigitem('annotate', 'ignorewseol',
    default=False,
)
coreconfigitem('annotate', 'nobinary',
    default=False,
)
coreconfigitem('annotate', 'noprefix',
    default=False,
)
coreconfigitem('auth', 'cookiefile',
    default=None,
)
# bookmarks.pushing: internal hack for discovery
coreconfigitem('bookmarks', 'pushing',
    default=list,
)
# bundle.mainreporoot: internal hack for bundlerepo
coreconfigitem('bundle', 'mainreporoot',
    default='',
)
# bundle.reorder: experimental config
coreconfigitem('bundle', 'reorder',
    default='auto',
)
coreconfigitem('censor', 'policy',
    default='abort',
)
coreconfigitem('chgserver', 'idletimeout',
    default=3600,
)
coreconfigitem('chgserver', 'skiphash',
    default=False,
)
coreconfigitem('cmdserver', 'log',
    default=None,
)
coreconfigitem('color', '.*',
    default=None,
    generic=True,
)
coreconfigitem('color', 'mode',
    default='auto',
)
coreconfigitem('color', 'pagermode',
    default=dynamicdefault,
)
coreconfigitem('commands', 'show.aliasprefix',
    default=list,
)
coreconfigitem('commands', 'status.relative',
    default=False,
)
coreconfigitem('commands', 'status.skipstates',
    default=[],
)
coreconfigitem('commands', 'status.verbose',
    default=False,
)
coreconfigitem('commands', 'update.check',
    default=None,
    # Deprecated, remove after 4.4 release
    alias=[('experimental', 'updatecheck')]
)
coreconfigitem('commands', 'update.requiredest',
    default=False,
)
coreconfigitem('committemplate', '.*',
    default=None,
    generic=True,
)
coreconfigitem('convert', 'cvsps.cache',
    default=True,
)
coreconfigitem('convert', 'cvsps.fuzz',
    default=60,
)
coreconfigitem('convert', 'cvsps.logencoding',
    default=None,
)
coreconfigitem('convert', 'cvsps.mergefrom',
    default=None,
)
coreconfigitem('convert', 'cvsps.mergeto',
    default=None,
)
coreconfigitem('convert', 'git.committeractions',
    default=lambda: ['messagedifferent'],
)
coreconfigitem('convert', 'git.extrakeys',
    default=list,
)
coreconfigitem('convert', 'git.findcopiesharder',
    default=False,
)
coreconfigitem('convert', 'git.remoteprefix',
    default='remote',
)
coreconfigitem('convert', 'git.renamelimit',
    default=400,
)
coreconfigitem('convert', 'git.saverev',
    default=True,
)
coreconfigitem('convert', 'git.similarity',
    default=50,
)
coreconfigitem('convert', 'git.skipsubmodules',
    default=False,
)
coreconfigitem('convert', 'hg.clonebranches',
    default=False,
)
coreconfigitem('convert', 'hg.ignoreerrors',
    default=False,
)
coreconfigitem('convert', 'hg.revs',
    default=None,
)
coreconfigitem('convert', 'hg.saverev',
    default=False,
)
coreconfigitem('convert', 'hg.sourcename',
    default=None,
)
coreconfigitem('convert', 'hg.startrev',
    default=None,
)
coreconfigitem('convert', 'hg.tagsbranch',
    default='default',
)
coreconfigitem('convert', 'hg.usebranchnames',
    default=True,
)
coreconfigitem('convert', 'ignoreancestorcheck',
    default=False,
)
coreconfigitem('convert', 'localtimezone',
    default=False,
)
coreconfigitem('convert', 'p4.encoding',
    default=dynamicdefault,
)
coreconfigitem('convert', 'p4.startrev',
    default=0,
)
coreconfigitem('convert', 'skiptags',
    default=False,
)
coreconfigitem('convert', 'svn.debugsvnlog',
    default=True,
)
coreconfigitem('convert', 'svn.trunk',
    default=None,
)
coreconfigitem('convert', 'svn.tags',
    default=None,
)
coreconfigitem('convert', 'svn.branches',
    default=None,
)
coreconfigitem('convert', 'svn.startrev',
    default=0,
)
coreconfigitem('debug', 'dirstate.delaywrite',
    default=0,
)
coreconfigitem('defaults', '.*',
    default=None,
    generic=True,
)
coreconfigitem('devel', 'all-warnings',
    default=False,
)
coreconfigitem('devel', 'bundle2.debug',
    default=False,
)
coreconfigitem('devel', 'cache-vfs',
    default=None,
)
coreconfigitem('devel', 'check-locks',
    default=False,
)
coreconfigitem('devel', 'check-relroot',
    default=False,
)
coreconfigitem('devel', 'default-date',
    default=None,
)
coreconfigitem('devel', 'deprec-warn',
    default=False,
)
coreconfigitem('devel', 'disableloaddefaultcerts',
    default=False,
)
coreconfigitem('devel', 'warn-empty-changegroup',
    default=False,
)
coreconfigitem('devel', 'legacy.exchange',
    default=list,
)
coreconfigitem('devel', 'servercafile',
    default='',
)
coreconfigitem('devel', 'serverexactprotocol',
    default='',
)
coreconfigitem('devel', 'serverrequirecert',
    default=False,
)
coreconfigitem('devel', 'strip-obsmarkers',
    default=True,
)
coreconfigitem('devel', 'warn-config',
    default=None,
)
coreconfigitem('devel', 'warn-config-default',
    default=None,
)
coreconfigitem('devel', 'user.obsmarker',
    default=None,
)
coreconfigitem('devel', 'warn-config-unknown',
    default=None,
)
coreconfigitem('devel', 'debug.peer-request',
    default=False,
)
coreconfigitem('diff', 'nodates',
    default=False,
)
coreconfigitem('diff', 'showfunc',
    default=False,
)
coreconfigitem('diff', 'unified',
    default=None,
)
coreconfigitem('diff', 'git',
    default=False,
)
coreconfigitem('diff', 'ignorews',
    default=False,
)
coreconfigitem('diff', 'ignorewsamount',
    default=False,
)
coreconfigitem('diff', 'ignoreblanklines',
    default=False,
)
coreconfigitem('diff', 'ignorewseol',
    default=False,
)
coreconfigitem('diff', 'nobinary',
    default=False,
)
coreconfigitem('diff', 'noprefix',
    default=False,
)
coreconfigitem('email', 'bcc',
    default=None,
)
coreconfigitem('email', 'cc',
    default=None,
)
coreconfigitem('email', 'charsets',
    default=list,
)
coreconfigitem('email', 'from',
    default=None,
)
coreconfigitem('email', 'method',
    default='smtp',
)
coreconfigitem('email', 'reply-to',
    default=None,
)
coreconfigitem('email', 'to',
    default=None,
)
coreconfigitem('experimental', 'archivemetatemplate',
    default=dynamicdefault,
)
coreconfigitem('experimental', 'bundle-phases',
    default=False,
)
coreconfigitem('experimental', 'bundle2-advertise',
    default=True,
)
coreconfigitem('experimental', 'bundle2-output-capture',
    default=False,
)
coreconfigitem('experimental', 'bundle2.pushback',
    default=False,
)
coreconfigitem('experimental', 'bundle2.stream',
    default=False,
)
coreconfigitem('experimental', 'bundle2lazylocking',
    default=False,
)
coreconfigitem('experimental', 'bundlecomplevel',
    default=None,
)
coreconfigitem('experimental', 'changegroup3',
    default=False,
)
coreconfigitem('experimental', 'clientcompressionengines',
    default=list,
)
coreconfigitem('experimental', 'copytrace',
    default='on',
)
coreconfigitem('experimental', 'copytrace.movecandidateslimit',
    default=100,
)
coreconfigitem('experimental', 'copytrace.sourcecommitlimit',
    default=100,
)
coreconfigitem('experimental', 'crecordtest',
    default=None,
)
coreconfigitem('experimental', 'directaccess',
    default=False,
)
coreconfigitem('experimental', 'directaccess.revnums',
    default=False,
)
coreconfigitem('experimental', 'editortmpinhg',
    default=False,
)
coreconfigitem('experimental', 'evolution',
    default=list,
)
coreconfigitem('experimental', 'evolution.allowdivergence',
    default=False,
    alias=[('experimental', 'allowdivergence')]
)
coreconfigitem('experimental', 'evolution.allowunstable',
    default=None,
)
coreconfigitem('experimental', 'evolution.createmarkers',
    default=None,
)
coreconfigitem('experimental', 'evolution.effect-flags',
    default=True,
    alias=[('experimental', 'effect-flags')]
)
coreconfigitem('experimental', 'evolution.exchange',
    default=None,
)
coreconfigitem('experimental', 'evolution.bundle-obsmarker',
    default=False,
)
coreconfigitem('experimental', 'evolution.report-instabilities',
    default=True,
)
coreconfigitem('experimental', 'evolution.track-operation',
    default=True,
)
coreconfigitem('experimental', 'worddiff',
    default=False,
)
coreconfigitem('experimental', 'maxdeltachainspan',
    default=-1,
)
coreconfigitem('experimental', 'mergetempdirprefix',
    default=None,
)
coreconfigitem('experimental', 'mmapindexthreshold',
    default=None,
)
coreconfigitem('experimental', 'nonnormalparanoidcheck',
    default=False,
)
coreconfigitem('experimental', 'exportableenviron',
    default=list,
)
coreconfigitem('experimental', 'extendedheader.index',
    default=None,
)
coreconfigitem('experimental', 'extendedheader.similarity',
    default=False,
)
coreconfigitem('experimental', 'format.compression',
    default='zlib',
)
coreconfigitem('experimental', 'graphshorten',
    default=False,
)
coreconfigitem('experimental', 'graphstyle.parent',
    default=dynamicdefault,
)
coreconfigitem('experimental', 'graphstyle.missing',
    default=dynamicdefault,
)
coreconfigitem('experimental', 'graphstyle.grandparent',
    default=dynamicdefault,
)
coreconfigitem('experimental', 'hook-track-tags',
    default=False,
)
coreconfigitem('experimental', 'httppostargs',
    default=False,
)
coreconfigitem('experimental', 'mergedriver',
    default=None,
)
coreconfigitem('experimental', 'obsmarkers-exchange-debug',
    default=False,
)
coreconfigitem('experimental', 'remotenames',
    default=False,
)
coreconfigitem('experimental', 'revlogv2',
    default=None,
)
coreconfigitem('experimental', 'single-head-per-branch',
    default=False,
)
coreconfigitem('experimental', 'sshserver.support-v2',
    default=False,
)
coreconfigitem('experimental', 'spacemovesdown',
    default=False,
)
coreconfigitem('experimental', 'sparse-read',
    default=False,
)
coreconfigitem('experimental', 'sparse-read.density-threshold',
    default=0.25,
)
coreconfigitem('experimental', 'sparse-read.min-gap-size',
    default='256K',
)
coreconfigitem('experimental', 'treemanifest',
    default=False,
)
coreconfigitem('experimental', 'update.atomic-file',
    default=False,
)
coreconfigitem('experimental', 'sshpeer.advertise-v2',
    default=False,
)
coreconfigitem('experimental', 'web.apiserver',
    default=False,
)
coreconfigitem('experimental', 'web.api.http-v2',
    default=False,
)
coreconfigitem('experimental', 'web.api.debugreflect',
    default=False,
)
coreconfigitem('experimental', 'xdiff',
    default=False,
)
coreconfigitem('extensions', '.*',
    default=None,
    generic=True,
)
coreconfigitem('extdata', '.*',
    default=None,
    generic=True,
)
coreconfigitem('format', 'aggressivemergedeltas',
    default=False,
)
coreconfigitem('format', 'chunkcachesize',
    default=None,
)
coreconfigitem('format', 'dotencode',
    default=True,
)
coreconfigitem('format', 'generaldelta',
    default=False,
)
coreconfigitem('format', 'manifestcachesize',
    default=None,
)
coreconfigitem('format', 'maxchainlen',
    default=None,
)
coreconfigitem('format', 'obsstore-version',
    default=None,
)
coreconfigitem('format', 'usefncache',
    default=True,
)
coreconfigitem('format', 'usegeneraldelta',
    default=True,
)
coreconfigitem('format', 'usestore',
    default=True,
)
coreconfigitem('fsmonitor', 'warn_when_unused',
    default=True,
)
coreconfigitem('fsmonitor', 'warn_update_file_count',
    default=50000,
)
coreconfigitem('hooks', '.*',
    default=dynamicdefault,
    generic=True,
)
coreconfigitem('hgweb-paths', '.*',
    default=list,
    generic=True,
)
coreconfigitem('hostfingerprints', '.*',
    default=list,
    generic=True,
)
coreconfigitem('hostsecurity', 'ciphers',
    default=None,
)
coreconfigitem('hostsecurity', 'disabletls10warning',
    default=False,
)
coreconfigitem('hostsecurity', 'minimumprotocol',
    default=dynamicdefault,
)
coreconfigitem('hostsecurity', '.*:minimumprotocol$',
    default=dynamicdefault,
    generic=True,
)
coreconfigitem('hostsecurity', '.*:ciphers$',
    default=dynamicdefault,
    generic=True,
)
coreconfigitem('hostsecurity', '.*:fingerprints$',
    default=list,
    generic=True,
)
coreconfigitem('hostsecurity', '.*:verifycertsfile$',
    default=None,
    generic=True,
)

coreconfigitem('http_proxy', 'always',
    default=False,
)
coreconfigitem('http_proxy', 'host',
    default=None,
)
coreconfigitem('http_proxy', 'no',
    default=list,
)
coreconfigitem('http_proxy', 'passwd',
    default=None,
)
coreconfigitem('http_proxy', 'user',
    default=None,
)
coreconfigitem('logtoprocess', 'commandexception',
    default=None,
)
coreconfigitem('logtoprocess', 'commandfinish',
    default=None,
)
coreconfigitem('logtoprocess', 'command',
    default=None,
)
coreconfigitem('logtoprocess', 'develwarn',
    default=None,
)
coreconfigitem('logtoprocess', 'uiblocked',
    default=None,
)
coreconfigitem('merge', 'checkunknown',
    default='abort',
)
coreconfigitem('merge', 'checkignored',
    default='abort',
)
coreconfigitem('experimental', 'merge.checkpathconflicts',
    default=False,
)
coreconfigitem('merge', 'followcopies',
    default=True,
)
coreconfigitem('merge', 'on-failure',
    default='continue',
)
coreconfigitem('merge', 'preferancestor',
        default=lambda: ['*'],
)
coreconfigitem('merge-tools', '.*',
    default=None,
    generic=True,
)
coreconfigitem('merge-tools', br'.*\.args$',
    default="$local $base $other",
    generic=True,
    priority=-1,
)
coreconfigitem('merge-tools', br'.*\.binary$',
    default=False,
    generic=True,
    priority=-1,
)
coreconfigitem('merge-tools', br'.*\.check$',
    default=list,
    generic=True,
    priority=-1,
)
coreconfigitem('merge-tools', br'.*\.checkchanged$',
    default=False,
    generic=True,
    priority=-1,
)
coreconfigitem('merge-tools', br'.*\.executable$',
    default=dynamicdefault,
    generic=True,
    priority=-1,
)
coreconfigitem('merge-tools', br'.*\.fixeol$',
    default=False,
    generic=True,
    priority=-1,
)
coreconfigitem('merge-tools', br'.*\.gui$',
    default=False,
    generic=True,
    priority=-1,
)
coreconfigitem('merge-tools', br'.*\.mergemarkers$',
    default='basic',
    generic=True,
    priority=-1,
)
coreconfigitem('merge-tools', br'.*\.mergemarkertemplate$',
    default=dynamicdefault,  # take from ui.mergemarkertemplate
    generic=True,
    priority=-1,
)
coreconfigitem('merge-tools', br'.*\.priority$',
    default=0,
    generic=True,
    priority=-1,
)
coreconfigitem('merge-tools', br'.*\.premerge$',
    default=dynamicdefault,
    generic=True,
    priority=-1,
)
coreconfigitem('merge-tools', br'.*\.symlink$',
    default=False,
    generic=True,
    priority=-1,
)
coreconfigitem('pager', 'attend-.*',
    default=dynamicdefault,
    generic=True,
)
coreconfigitem('pager', 'ignore',
    default=list,
)
coreconfigitem('pager', 'pager',
    default=dynamicdefault,
)
coreconfigitem('patch', 'eol',
    default='strict',
)
coreconfigitem('patch', 'fuzz',
    default=2,
)
coreconfigitem('paths', 'default',
    default=None,
)
coreconfigitem('paths', 'default-push',
    default=None,
)
coreconfigitem('paths', '.*',
    default=None,
    generic=True,
)
coreconfigitem('phases', 'checksubrepos',
    default='follow',
)
coreconfigitem('phases', 'new-commit',
    default='draft',
)
coreconfigitem('phases', 'publish',
    default=True,
)
coreconfigitem('profiling', 'enabled',
    default=False,
)
coreconfigitem('profiling', 'format',
    default='text',
)
coreconfigitem('profiling', 'freq',
    default=1000,
)
coreconfigitem('profiling', 'limit',
    default=30,
)
coreconfigitem('profiling', 'nested',
    default=0,
)
coreconfigitem('profiling', 'output',
    default=None,
)
coreconfigitem('profiling', 'showmax',
    default=0.999,
)
coreconfigitem('profiling', 'showmin',
    default=dynamicdefault,
)
coreconfigitem('profiling', 'sort',
    default='inlinetime',
)
coreconfigitem('profiling', 'statformat',
    default='hotpath',
)
coreconfigitem('profiling', 'type',
    default='stat',
)
coreconfigitem('progress', 'assume-tty',
    default=False,
)
coreconfigitem('progress', 'changedelay',
    default=1,
)
coreconfigitem('progress', 'clear-complete',
    default=True,
)
coreconfigitem('progress', 'debug',
    default=False,
)
coreconfigitem('progress', 'delay',
    default=3,
)
coreconfigitem('progress', 'disable',
    default=False,
)
coreconfigitem('progress', 'estimateinterval',
    default=60.0,
)
coreconfigitem('progress', 'format',
    default=lambda: ['topic', 'bar', 'number', 'estimate'],
)
coreconfigitem('progress', 'refresh',
    default=0.1,
)
coreconfigitem('progress', 'width',
    default=dynamicdefault,
)
coreconfigitem('push', 'pushvars.server',
    default=False,
)
coreconfigitem('server', 'bookmarks-pushkey-compat',
    default=True,
)
coreconfigitem('server', 'bundle1',
    default=True,
)
coreconfigitem('server', 'bundle1gd',
    default=None,
)
coreconfigitem('server', 'bundle1.pull',
    default=None,
)
coreconfigitem('server', 'bundle1gd.pull',
    default=None,
)
coreconfigitem('server', 'bundle1.push',
    default=None,
)
coreconfigitem('server', 'bundle1gd.push',
    default=None,
)
coreconfigitem('server', 'compressionengines',
    default=list,
)
coreconfigitem('server', 'concurrent-push-mode',
    default='strict',
)
coreconfigitem('server', 'disablefullbundle',
    default=False,
)
coreconfigitem('server', 'maxhttpheaderlen',
    default=1024,
)
coreconfigitem('server', 'preferuncompressed',
    default=False,
)
coreconfigitem('server', 'uncompressed',
    default=True,
)
coreconfigitem('server', 'uncompressedallowsecret',
    default=False,
)
coreconfigitem('server', 'validate',
    default=False,
)
coreconfigitem('server', 'zliblevel',
    default=-1,
)
coreconfigitem('share', 'pool',
    default=None,
)
coreconfigitem('share', 'poolnaming',
    default='identity',
)
coreconfigitem('smtp', 'host',
    default=None,
)
coreconfigitem('smtp', 'local_hostname',
    default=None,
)
coreconfigitem('smtp', 'password',
    default=None,
)
coreconfigitem('smtp', 'port',
    default=dynamicdefault,
)
coreconfigitem('smtp', 'tls',
    default='none',
)
coreconfigitem('smtp', 'username',
    default=None,
)
coreconfigitem('sparse', 'missingwarning',
    default=True,
)
coreconfigitem('subrepos', 'allowed',
    default=dynamicdefault,  # to make backporting simpler
)
coreconfigitem('subrepos', 'hg:allowed',
    default=dynamicdefault,
)
coreconfigitem('subrepos', 'git:allowed',
    default=dynamicdefault,
)
coreconfigitem('subrepos', 'svn:allowed',
    default=dynamicdefault,
)
coreconfigitem('templates', '.*',
    default=None,
    generic=True,
)
coreconfigitem('trusted', 'groups',
    default=list,
)
coreconfigitem('trusted', 'users',
    default=list,
)
coreconfigitem('ui', '_usedassubrepo',
    default=False,
)
coreconfigitem('ui', 'allowemptycommit',
    default=False,
)
coreconfigitem('ui', 'archivemeta',
    default=True,
)
coreconfigitem('ui', 'askusername',
    default=False,
)
coreconfigitem('ui', 'clonebundlefallback',
    default=False,
)
coreconfigitem('ui', 'clonebundleprefers',
    default=list,
)
coreconfigitem('ui', 'clonebundles',
    default=True,
)
coreconfigitem('ui', 'color',
    default='auto',
)
coreconfigitem('ui', 'commitsubrepos',
    default=False,
)
coreconfigitem('ui', 'debug',
    default=False,
)
coreconfigitem('ui', 'debugger',
    default=None,
)
coreconfigitem('ui', 'editor',
    default=dynamicdefault,
)
coreconfigitem('ui', 'fallbackencoding',
    default=None,
)
coreconfigitem('ui', 'forcecwd',
    default=None,
)
coreconfigitem('ui', 'forcemerge',
    default=None,
)
coreconfigitem('ui', 'formatdebug',
    default=False,
)
coreconfigitem('ui', 'formatjson',
    default=False,
)
coreconfigitem('ui', 'formatted',
    default=None,
)
coreconfigitem('ui', 'graphnodetemplate',
    default=None,
)
coreconfigitem('ui', 'interactive',
    default=None,
)
coreconfigitem('ui', 'interface',
    default=None,
)
coreconfigitem('ui', 'interface.chunkselector',
    default=None,
)
coreconfigitem('ui', 'logblockedtimes',
    default=False,
)
coreconfigitem('ui', 'logtemplate',
    default=None,
)
coreconfigitem('ui', 'merge',
    default=None,
)
coreconfigitem('ui', 'mergemarkers',
    default='basic',
)
coreconfigitem('ui', 'mergemarkertemplate',
    default=('{node|short} '
            '{ifeq(tags, "tip", "", '
            'ifeq(tags, "", "", "{tags} "))}'
            '{if(bookmarks, "{bookmarks} ")}'
            '{ifeq(branch, "default", "", "{branch} ")}'
            '- {author|user}: {desc|firstline}')
)
coreconfigitem('ui', 'nontty',
    default=False,
)
coreconfigitem('ui', 'origbackuppath',
    default=None,
)
coreconfigitem('ui', 'paginate',
    default=True,
)
coreconfigitem('ui', 'patch',
    default=None,
)
coreconfigitem('ui', 'portablefilenames',
    default='warn',
)
coreconfigitem('ui', 'promptecho',
    default=False,
)
coreconfigitem('ui', 'quiet',
    default=False,
)
coreconfigitem('ui', 'quietbookmarkmove',
    default=False,
)
coreconfigitem('ui', 'remotecmd',
    default='hg',
)
coreconfigitem('ui', 'report_untrusted',
    default=True,
)
coreconfigitem('ui', 'rollback',
    default=True,
)
coreconfigitem('ui', 'slash',
    default=False,
)
coreconfigitem('ui', 'ssh',
    default='ssh',
)
coreconfigitem('ui', 'ssherrorhint',
    default=None,
)
coreconfigitem('ui', 'statuscopies',
    default=False,
)
coreconfigitem('ui', 'strict',
    default=False,
)
coreconfigitem('ui', 'style',
    default='',
)
coreconfigitem('ui', 'supportcontact',
    default=None,
)
coreconfigitem('ui', 'textwidth',
    default=78,
)
coreconfigitem('ui', 'timeout',
    default='600',
)
coreconfigitem('ui', 'timeout.warn',
    default=0,
)
coreconfigitem('ui', 'traceback',
    default=False,
)
coreconfigitem('ui', 'tweakdefaults',
    default=False,
)
coreconfigitem('ui', 'username',
    alias=[('ui', 'user')]
)
coreconfigitem('ui', 'verbose',
    default=False,
)
coreconfigitem('verify', 'skipflags',
    default=None,
)
coreconfigitem('web', 'allowbz2',
    default=False,
)
coreconfigitem('web', 'allowgz',
    default=False,
)
coreconfigitem('web', 'allow-pull',
    alias=[('web', 'allowpull')],
    default=True,
)
coreconfigitem('web', 'allow-push',
    alias=[('web', 'allow_push')],
    default=list,
)
coreconfigitem('web', 'allowzip',
    default=False,
)
coreconfigitem('web', 'archivesubrepos',
    default=False,
)
coreconfigitem('web', 'cache',
    default=True,
)
coreconfigitem('web', 'contact',
    default=None,
)
coreconfigitem('web', 'deny_push',
    default=list,
)
coreconfigitem('web', 'guessmime',
    default=False,
)
coreconfigitem('web', 'hidden',
    default=False,
)
coreconfigitem('web', 'labels',
    default=list,
)
coreconfigitem('web', 'logoimg',
    default='hglogo.png',
)
coreconfigitem('web', 'logourl',
    default='https://mercurial-scm.org/',
)
coreconfigitem('web', 'accesslog',
    default='-',
)
coreconfigitem('web', 'address',
    default='',
)
coreconfigitem('web', 'allow_archive',
    default=list,
)
coreconfigitem('web', 'allow_read',
    default=list,
)
coreconfigitem('web', 'baseurl',
    default=None,
)
coreconfigitem('web', 'cacerts',
    default=None,
)
coreconfigitem('web', 'certificate',
    default=None,
)
coreconfigitem('web', 'collapse',
    default=False,
)
coreconfigitem('web', 'csp',
    default=None,
)
coreconfigitem('web', 'deny_read',
    default=list,
)
coreconfigitem('web', 'descend',
    default=True,
)
coreconfigitem('web', 'description',
    default="",
)
coreconfigitem('web', 'encoding',
    default=lambda: encoding.encoding,
)
coreconfigitem('web', 'errorlog',
    default='-',
)
coreconfigitem('web', 'ipv6',
    default=False,
)
coreconfigitem('web', 'maxchanges',
    default=10,
)
coreconfigitem('web', 'maxfiles',
    default=10,
)
coreconfigitem('web', 'maxshortchanges',
    default=60,
)
coreconfigitem('web', 'motd',
    default='',
)
coreconfigitem('web', 'name',
    default=dynamicdefault,
)
coreconfigitem('web', 'port',
    default=8000,
)
coreconfigitem('web', 'prefix',
    default='',
)
coreconfigitem('web', 'push_ssl',
    default=True,
)
coreconfigitem('web', 'refreshinterval',
    default=20,
)
coreconfigitem('web', 'server-header',
    default=None,
)
coreconfigitem('web', 'staticurl',
    default=None,
)
coreconfigitem('web', 'stripes',
    default=1,
)
coreconfigitem('web', 'style',
    default='paper',
)
coreconfigitem('web', 'templates',
    default=None,
)
coreconfigitem('web', 'view',
    default='served',
)
coreconfigitem('worker', 'backgroundclose',
    default=dynamicdefault,
)
# Windows defaults to a limit of 512 open files. A buffer of 128
# should give us enough headway.
coreconfigitem('worker', 'backgroundclosemaxqueue',
    default=384,
)
coreconfigitem('worker', 'backgroundcloseminfilecount',
    default=2048,
)
coreconfigitem('worker', 'backgroundclosethreadcount',
    default=4,
)
coreconfigitem('worker', 'enabled',
    default=True,
)
coreconfigitem('worker', 'numcpus',
    default=None,
)

# Rebase related configuration moved to core because other extension are doing
# strange things. For example, shelve import the extensions to reuse some bit
# without formally loading it.
coreconfigitem('commands', 'rebase.requiredest',
            default=False,
)
coreconfigitem('experimental', 'rebaseskipobsolete',
    default=True,
)
coreconfigitem('rebase', 'singletransaction',
    default=False,
)
coreconfigitem('rebase', 'experimental.inmemory',
    default=False,
)