mercurial/configitems.py

dirstate: Remove the flat Rust DirstateMap implementation

Before this changeset we had two Rust implementations of `DirstateMap`.
This removes the "flat" DirstateMap so that the "tree" DirstateMap is always
used when Rust enabled. This simplifies the code a lot, and will enable
(in the next changeset) further removal of a trait abstraction.

This is a performance regression when:

* Rust is enabled, and
* The repository uses the legacy dirstate-v1 file format, and
* For `hg status`, unknown files are not listed (such as with `-mard`)

The regression is about 100 milliseconds for `hg status -mard` on a
semi-large repository (mozilla-central), from ~320ms to ~420ms.
We deem this to be small enough to be worth it.

The new dirstate-v2 is still experimental at this point, but we aim to
stabilize it (though not yet enable it by default for new repositories)
in Mercurial 6.0. Eventually, upgrating repositories to dirsate-v2 will
eliminate this regression (and enable other performance improvements).


# Background

The flat DirstateMap was introduced with the first Rust implementation of the
status algorithm. It works similarly to the previous Python + C one, with a
single `HashMap` that associates file paths to a `DirstateEntry` (where Python
has a dict).

We later added the tree DirstateMap where the root of the tree contains nodes
for files and directories that are directly at the root of the repository,
and nodes for directories can contain child nodes representing the files and
directly that *they* contain directly. The shape of this tree mirrors that of
the working directory in the filesystem. This enables the status algorithm to
traverse this tree in tandem with traversing the filesystem tree, which in
turns enables a more efficient algorithm.

Furthermore, the new dirstate-v2 file format is also based on a tree of the
same shape. The tree DirstateMap can access a dirstate-v2 file without parsing
it: binary data in a single large (possibly memory-mapped) bytes buffer is
traversed on demand. This allows `DirstateMap` creation to take `O(1)` time.
(Mutation works by creating new in-memory nodes with copy-on-write semantics,
and serialization is append-mostly.)

The tradeoff is that for "legacy" repositories that use the dirstate-v1 file
format, parsing that file into a tree DirstateMap takes more time. Profiling
shows that this time is dominated by `HashMap`. For a dirstate containing `F`
files with an average `D` directory depth, the flat DirstateMap does parsing
in `O(F)` number of HashMap operations but the tree DirstateMap in `O(F × D)`
operations, since each node has its own HashMap containing its child nodes.
This slower costs ~140ms on an old snapshot of mozilla-central, and ~80ms
on an old snapshot of the Netbeans repository.

The status algorithm is faster, but with `-mard` (when not listing unknown
files) it is typically not faster *enough* to compensate the slower parsing.

Both Rust implementations are always faster than the Python + C implementation


# Benchmark results

All benchmarks are run on changeset 98c0408324e6, with repositories that use
the dirstate-v1 file format, on a server with 4 CPU cores and 4 CPU threads
(no HyperThreading).

`hg status` benchmarks show wall clock times of the entire command as the
average and standard deviation of serveral runs, collected by
https://github.com/sharkdp/hyperfine and reformated.

Parsing benchmarks are wall clock time of the Rust function that converts a
bytes buffer of the dirstate file into the `DirstateMap` data structure as
used by the status algorithm. A single run each, collected by running
`hg status` this environment variable:

    RUST_LOG=hg::dirstate::dirstate_map=trace,hg::dirstate_tree::dirstate_map=trace


Benchmark 1: Rust flat DirstateMap → Rust tree DirstateMap

    hg status

    mozilla-clean    	562.3 ms ± 2.0 ms	→	462.5 ms ± 0.6 ms	 1.22 ± 0.00 times faster
    mozilla-dirty    	859.6 ms ± 2.2 ms	→	719.5 ms ± 3.2 ms	 1.19 ± 0.01 times faster
    mozilla-ignored  	558.2 ms ± 3.0 ms	→	457.9 ms ± 2.9 ms	 1.22 ± 0.01 times faster
    mozilla-unknowns 	859.4 ms ± 5.7 ms	→	716.0 ms ± 4.7 ms	 1.20 ± 0.01 times faster
    netbeans-clean   	336.5 ms ± 0.9 ms	→	339.5 ms ± 0.4 ms	 0.99 ± 0.00 times faster
    netbeans-dirty   	491.4 ms ± 1.6 ms	→	475.1 ms ± 1.2 ms	 1.03 ± 0.00 times faster
    netbeans-ignored 	343.7 ms ± 1.0 ms	→	347.8 ms ± 0.4 ms	 0.99 ± 0.00 times faster
    netbeans-unknowns	484.3 ms ± 1.0 ms	→	466.0 ms ± 1.2 ms	 1.04 ± 0.00 times faster

    hg status -mard

    mozilla-clean    	317.3 ms ± 0.6 ms	→	422.5 ms ± 1.2 ms	 0.75 ± 0.00 times faster
    mozilla-dirty    	315.4 ms ± 0.6 ms	→	417.7 ms ± 1.1 ms	 0.76 ± 0.00 times faster
    mozilla-ignored  	314.6 ms ± 0.6 ms	→	417.4 ms ± 1.0 ms	 0.75 ± 0.00 times faster
    mozilla-unknowns 	312.9 ms ± 0.9 ms	→	417.3 ms ± 1.6 ms	 0.75 ± 0.00 times faster
    netbeans-clean   	212.0 ms ± 0.6 ms	→	283.6 ms ± 0.8 ms	 0.75 ± 0.00 times faster
    netbeans-dirty   	211.4 ms ± 1.0 ms	→	283.4 ms ± 1.6 ms	 0.75 ± 0.01 times faster
    netbeans-ignored 	211.4 ms ± 0.9 ms	→	283.9 ms ± 0.8 ms	 0.74 ± 0.01 times faster
    netbeans-unknowns	211.1 ms ± 0.6 ms	→	283.4 ms ± 1.0 ms	 0.74 ± 0.00 times faster

    Parsing

    mozilla-clean       38.4ms → 177.6ms
    mozilla-dirty       38.8ms → 177.0ms
    mozilla-ignored     38.8ms → 178.0ms
    mozilla-unknowns    38.7ms → 176.9ms
    netbeans-clean      16.5ms → 97.3ms
    netbeans-dirty      16.5ms → 98.4ms
    netbeans-ignored    16.9ms → 97.4ms
    netbeans-unknowns   16.9ms → 96.3ms


Benchmark 2: Python + C dirstatemap → Rust tree DirstateMap

    hg status

    mozilla-clean    	1261.0 ms ± 3.6 ms	→	461.1 ms ± 0.5 ms	 2.73 ± 0.00 times faster
    mozilla-dirty    	2293.4 ms ± 9.1 ms	→	719.6 ms ± 3.6 ms	 3.19 ± 0.01 times faster
    mozilla-ignored  	1240.4 ms ± 2.3 ms	→	457.7 ms ± 1.9 ms	 2.71 ± 0.00 times faster
    mozilla-unknowns 	2283.3 ms ± 9.0 ms	→	719.7 ms ± 3.8 ms	 3.17 ± 0.01 times faster
    netbeans-clean   	879.7 ms ± 3.5 ms	→	339.9 ms ± 0.5 ms	 2.59 ± 0.00 times faster
    netbeans-dirty   	1257.3 ms ± 4.7 ms	→	474.6 ms ± 1.6 ms	 2.65 ± 0.01 times faster
    netbeans-ignored 	943.9 ms ± 1.9 ms	→	347.3 ms ± 1.1 ms	 2.72 ± 0.00 times faster
    netbeans-unknowns	1188.1 ms ± 5.0 ms	→	465.2 ms ± 2.3 ms	 2.55 ± 0.01 times faster

    hg status -mard

    mozilla-clean    	903.2 ms ± 3.6 ms	→	423.4 ms ± 2.2 ms	 2.13 ± 0.01 times faster
    mozilla-dirty    	884.6 ms ± 4.5 ms	→	417.3 ms ± 1.4 ms	 2.12 ± 0.01 times faster
    mozilla-ignored  	881.9 ms ± 1.3 ms	→	417.3 ms ± 0.8 ms	 2.11 ± 0.00 times faster
    mozilla-unknowns 	878.5 ms ± 1.9 ms	→	416.4 ms ± 0.9 ms	 2.11 ± 0.00 times faster
    netbeans-clean   	434.9 ms ± 1.8 ms	→	284.0 ms ± 0.8 ms	 1.53 ± 0.01 times faster
    netbeans-dirty   	434.1 ms ± 0.8 ms	→	283.1 ms ± 0.8 ms	 1.53 ± 0.00 times faster
    netbeans-ignored 	431.7 ms ± 1.1 ms	→	283.6 ms ± 1.8 ms	 1.52 ± 0.01 times faster
    netbeans-unknowns	433.0 ms ± 1.3 ms	→	283.5 ms ± 0.7 ms	 1.53 ± 0.00 times faster

Differential Revision: https://phab.mercurial-scm.org/D11516

# 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 = b"extension '%s' overwrite config item '%s.%s'"
            msg %= (extname, section, key)
            ui.develwarn(msg, config=b'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,
        experimental=False,
    ):
        self.section = section
        self.name = name
        self.default = default
        self.alias = list(alias)
        self.generic = generic
        self.priority = priority
        self.experimental = experimental
        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 = b"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)


def _registerdiffopts(section, configprefix=b''):
    coreconfigitem(
        section,
        configprefix + b'nodates',
        default=False,
    )
    coreconfigitem(
        section,
        configprefix + b'showfunc',
        default=False,
    )
    coreconfigitem(
        section,
        configprefix + b'unified',
        default=None,
    )
    coreconfigitem(
        section,
        configprefix + b'git',
        default=False,
    )
    coreconfigitem(
        section,
        configprefix + b'ignorews',
        default=False,
    )
    coreconfigitem(
        section,
        configprefix + b'ignorewsamount',
        default=False,
    )
    coreconfigitem(
        section,
        configprefix + b'ignoreblanklines',
        default=False,
    )
    coreconfigitem(
        section,
        configprefix + b'ignorewseol',
        default=False,
    )
    coreconfigitem(
        section,
        configprefix + b'nobinary',
        default=False,
    )
    coreconfigitem(
        section,
        configprefix + b'noprefix',
        default=False,
    )
    coreconfigitem(
        section,
        configprefix + b'word-diff',
        default=False,
    )


coreconfigitem(
    b'alias',
    b'.*',
    default=dynamicdefault,
    generic=True,
)
coreconfigitem(
    b'auth',
    b'cookiefile',
    default=None,
)
_registerdiffopts(section=b'annotate')
# bookmarks.pushing: internal hack for discovery
coreconfigitem(
    b'bookmarks',
    b'pushing',
    default=list,
)
coreconfigitem(
    b'bookmarks',
    b'mirror',
    default=False,
)
# bundle.mainreporoot: internal hack for bundlerepo
coreconfigitem(
    b'bundle',
    b'mainreporoot',
    default=b'',
)
coreconfigitem(
    b'censor',
    b'policy',
    default=b'abort',
    experimental=True,
)
coreconfigitem(
    b'chgserver',
    b'idletimeout',
    default=3600,
)
coreconfigitem(
    b'chgserver',
    b'skiphash',
    default=False,
)
coreconfigitem(
    b'cmdserver',
    b'log',
    default=None,
)
coreconfigitem(
    b'cmdserver',
    b'max-log-files',
    default=7,
)
coreconfigitem(
    b'cmdserver',
    b'max-log-size',
    default=b'1 MB',
)
coreconfigitem(
    b'cmdserver',
    b'max-repo-cache',
    default=0,
    experimental=True,
)
coreconfigitem(
    b'cmdserver',
    b'message-encodings',
    default=list,
)
coreconfigitem(
    b'cmdserver',
    b'track-log',
    default=lambda: [b'chgserver', b'cmdserver', b'repocache'],
)
coreconfigitem(
    b'cmdserver',
    b'shutdown-on-interrupt',
    default=True,
)
coreconfigitem(
    b'color',
    b'.*',
    default=None,
    generic=True,
)
coreconfigitem(
    b'color',
    b'mode',
    default=b'auto',
)
coreconfigitem(
    b'color',
    b'pagermode',
    default=dynamicdefault,
)
coreconfigitem(
    b'command-templates',
    b'graphnode',
    default=None,
    alias=[(b'ui', b'graphnodetemplate')],
)
coreconfigitem(
    b'command-templates',
    b'log',
    default=None,
    alias=[(b'ui', b'logtemplate')],
)
coreconfigitem(
    b'command-templates',
    b'mergemarker',
    default=(
        b'{node|short} '
        b'{ifeq(tags, "tip", "", '
        b'ifeq(tags, "", "", "{tags} "))}'
        b'{if(bookmarks, "{bookmarks} ")}'
        b'{ifeq(branch, "default", "", "{branch} ")}'
        b'- {author|user}: {desc|firstline}'
    ),
    alias=[(b'ui', b'mergemarkertemplate')],
)
coreconfigitem(
    b'command-templates',
    b'pre-merge-tool-output',
    default=None,
    alias=[(b'ui', b'pre-merge-tool-output-template')],
)
coreconfigitem(
    b'command-templates',
    b'oneline-summary',
    default=None,
)
coreconfigitem(
    b'command-templates',
    b'oneline-summary.*',
    default=dynamicdefault,
    generic=True,
)
_registerdiffopts(section=b'commands', configprefix=b'commit.interactive.')
coreconfigitem(
    b'commands',
    b'commit.post-status',
    default=False,
)
coreconfigitem(
    b'commands',
    b'grep.all-files',
    default=False,
    experimental=True,
)
coreconfigitem(
    b'commands',
    b'merge.require-rev',
    default=False,
)
coreconfigitem(
    b'commands',
    b'push.require-revs',
    default=False,
)
coreconfigitem(
    b'commands',
    b'resolve.confirm',
    default=False,
)
coreconfigitem(
    b'commands',
    b'resolve.explicit-re-merge',
    default=False,
)
coreconfigitem(
    b'commands',
    b'resolve.mark-check',
    default=b'none',
)
_registerdiffopts(section=b'commands', configprefix=b'revert.interactive.')
coreconfigitem(
    b'commands',
    b'show.aliasprefix',
    default=list,
)
coreconfigitem(
    b'commands',
    b'status.relative',
    default=False,
)
coreconfigitem(
    b'commands',
    b'status.skipstates',
    default=[],
    experimental=True,
)
coreconfigitem(
    b'commands',
    b'status.terse',
    default=b'',
)
coreconfigitem(
    b'commands',
    b'status.verbose',
    default=False,
)
coreconfigitem(
    b'commands',
    b'update.check',
    default=None,
)
coreconfigitem(
    b'commands',
    b'update.requiredest',
    default=False,
)
coreconfigitem(
    b'committemplate',
    b'.*',
    default=None,
    generic=True,
)
coreconfigitem(
    b'convert',
    b'bzr.saverev',
    default=True,
)
coreconfigitem(
    b'convert',
    b'cvsps.cache',
    default=True,
)
coreconfigitem(
    b'convert',
    b'cvsps.fuzz',
    default=60,
)
coreconfigitem(
    b'convert',
    b'cvsps.logencoding',
    default=None,
)
coreconfigitem(
    b'convert',
    b'cvsps.mergefrom',
    default=None,
)
coreconfigitem(
    b'convert',
    b'cvsps.mergeto',
    default=None,
)
coreconfigitem(
    b'convert',
    b'git.committeractions',
    default=lambda: [b'messagedifferent'],
)
coreconfigitem(
    b'convert',
    b'git.extrakeys',
    default=list,
)
coreconfigitem(
    b'convert',
    b'git.findcopiesharder',
    default=False,
)
coreconfigitem(
    b'convert',
    b'git.remoteprefix',
    default=b'remote',
)
coreconfigitem(
    b'convert',
    b'git.renamelimit',
    default=400,
)
coreconfigitem(
    b'convert',
    b'git.saverev',
    default=True,
)
coreconfigitem(
    b'convert',
    b'git.similarity',
    default=50,
)
coreconfigitem(
    b'convert',
    b'git.skipsubmodules',
    default=False,
)
coreconfigitem(
    b'convert',
    b'hg.clonebranches',
    default=False,
)
coreconfigitem(
    b'convert',
    b'hg.ignoreerrors',
    default=False,
)
coreconfigitem(
    b'convert',
    b'hg.preserve-hash',
    default=False,
)
coreconfigitem(
    b'convert',
    b'hg.revs',
    default=None,
)
coreconfigitem(
    b'convert',
    b'hg.saverev',
    default=False,
)
coreconfigitem(
    b'convert',
    b'hg.sourcename',
    default=None,
)
coreconfigitem(
    b'convert',
    b'hg.startrev',
    default=None,
)
coreconfigitem(
    b'convert',
    b'hg.tagsbranch',
    default=b'default',
)
coreconfigitem(
    b'convert',
    b'hg.usebranchnames',
    default=True,
)
coreconfigitem(
    b'convert',
    b'ignoreancestorcheck',
    default=False,
    experimental=True,
)
coreconfigitem(
    b'convert',
    b'localtimezone',
    default=False,
)
coreconfigitem(
    b'convert',
    b'p4.encoding',
    default=dynamicdefault,
)
coreconfigitem(
    b'convert',
    b'p4.startrev',
    default=0,
)
coreconfigitem(
    b'convert',
    b'skiptags',
    default=False,
)
coreconfigitem(
    b'convert',
    b'svn.debugsvnlog',
    default=True,
)
coreconfigitem(
    b'convert',
    b'svn.trunk',
    default=None,
)
coreconfigitem(
    b'convert',
    b'svn.tags',
    default=None,
)
coreconfigitem(
    b'convert',
    b'svn.branches',
    default=None,
)
coreconfigitem(
    b'convert',
    b'svn.startrev',
    default=0,
)
coreconfigitem(
    b'convert',
    b'svn.dangerous-set-commit-dates',
    default=False,
)
coreconfigitem(
    b'debug',
    b'dirstate.delaywrite',
    default=0,
)
coreconfigitem(
    b'debug',
    b'revlog.verifyposition.changelog',
    default=b'',
)
coreconfigitem(
    b'defaults',
    b'.*',
    default=None,
    generic=True,
)
coreconfigitem(
    b'devel',
    b'all-warnings',
    default=False,
)
coreconfigitem(
    b'devel',
    b'bundle2.debug',
    default=False,
)
coreconfigitem(
    b'devel',
    b'bundle.delta',
    default=b'',
)
coreconfigitem(
    b'devel',
    b'cache-vfs',
    default=None,
)
coreconfigitem(
    b'devel',
    b'check-locks',
    default=False,
)
coreconfigitem(
    b'devel',
    b'check-relroot',
    default=False,
)
# Track copy information for all file, not just "added" one (very slow)
coreconfigitem(
    b'devel',
    b'copy-tracing.trace-all-files',
    default=False,
)
coreconfigitem(
    b'devel',
    b'default-date',
    default=None,
)
coreconfigitem(
    b'devel',
    b'deprec-warn',
    default=False,
)
coreconfigitem(
    b'devel',
    b'disableloaddefaultcerts',
    default=False,
)
coreconfigitem(
    b'devel',
    b'warn-empty-changegroup',
    default=False,
)
coreconfigitem(
    b'devel',
    b'legacy.exchange',
    default=list,
)
# When True, revlogs use a special reference version of the nodemap, that is not
# performant but is "known" to behave properly.
coreconfigitem(
    b'devel',
    b'persistent-nodemap',
    default=False,
)
coreconfigitem(
    b'devel',
    b'servercafile',
    default=b'',
)
coreconfigitem(
    b'devel',
    b'serverexactprotocol',
    default=b'',
)
coreconfigitem(
    b'devel',
    b'serverrequirecert',
    default=False,
)
coreconfigitem(
    b'devel',
    b'strip-obsmarkers',
    default=True,
)
coreconfigitem(
    b'devel',
    b'warn-config',
    default=None,
)
coreconfigitem(
    b'devel',
    b'warn-config-default',
    default=None,
)
coreconfigitem(
    b'devel',
    b'user.obsmarker',
    default=None,
)
coreconfigitem(
    b'devel',
    b'warn-config-unknown',
    default=None,
)
coreconfigitem(
    b'devel',
    b'debug.copies',
    default=False,
)
coreconfigitem(
    b'devel',
    b'copy-tracing.multi-thread',
    default=True,
)
coreconfigitem(
    b'devel',
    b'debug.extensions',
    default=False,
)
coreconfigitem(
    b'devel',
    b'debug.repo-filters',
    default=False,
)
coreconfigitem(
    b'devel',
    b'debug.peer-request',
    default=False,
)
# If discovery.exchange-heads is False, the discovery will not start with
# remote head fetching and local head querying.
coreconfigitem(
    b'devel',
    b'discovery.exchange-heads',
    default=True,
)
# If discovery.grow-sample is False, the sample size used in set discovery will
# not be increased through the process
coreconfigitem(
    b'devel',
    b'discovery.grow-sample',
    default=True,
)
# When discovery.grow-sample.dynamic is True, the default, the sample size is
# adapted to the shape of the undecided set (it is set to the max of:
# <target-size>, len(roots(undecided)), len(heads(undecided)
coreconfigitem(
    b'devel',
    b'discovery.grow-sample.dynamic',
    default=True,
)
# discovery.grow-sample.rate control the rate at which the sample grow
coreconfigitem(
    b'devel',
    b'discovery.grow-sample.rate',
    default=1.05,
)
# If discovery.randomize is False, random sampling during discovery are
# deterministic. It is meant for integration tests.
coreconfigitem(
    b'devel',
    b'discovery.randomize',
    default=True,
)
# Control the initial size of the discovery sample
coreconfigitem(
    b'devel',
    b'discovery.sample-size',
    default=200,
)
# Control the initial size of the discovery for initial change
coreconfigitem(
    b'devel',
    b'discovery.sample-size.initial',
    default=100,
)
_registerdiffopts(section=b'diff')
coreconfigitem(
    b'diff',
    b'merge',
    default=False,
    experimental=True,
)
coreconfigitem(
    b'email',
    b'bcc',
    default=None,
)
coreconfigitem(
    b'email',
    b'cc',
    default=None,
)
coreconfigitem(
    b'email',
    b'charsets',
    default=list,
)
coreconfigitem(
    b'email',
    b'from',
    default=None,
)
coreconfigitem(
    b'email',
    b'method',
    default=b'smtp',
)
coreconfigitem(
    b'email',
    b'reply-to',
    default=None,
)
coreconfigitem(
    b'email',
    b'to',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'archivemetatemplate',
    default=dynamicdefault,
)
coreconfigitem(
    b'experimental',
    b'auto-publish',
    default=b'publish',
)
coreconfigitem(
    b'experimental',
    b'bundle-phases',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'bundle2-advertise',
    default=True,
)
coreconfigitem(
    b'experimental',
    b'bundle2-output-capture',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'bundle2.pushback',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'bundle2lazylocking',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'bundlecomplevel',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'bundlecomplevel.bzip2',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'bundlecomplevel.gzip',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'bundlecomplevel.none',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'bundlecomplevel.zstd',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'bundlecompthreads',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'bundlecompthreads.bzip2',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'bundlecompthreads.gzip',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'bundlecompthreads.none',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'bundlecompthreads.zstd',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'changegroup3',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'changegroup4',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'cleanup-as-archived',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'clientcompressionengines',
    default=list,
)
coreconfigitem(
    b'experimental',
    b'copytrace',
    default=b'on',
)
coreconfigitem(
    b'experimental',
    b'copytrace.movecandidateslimit',
    default=100,
)
coreconfigitem(
    b'experimental',
    b'copytrace.sourcecommitlimit',
    default=100,
)
coreconfigitem(
    b'experimental',
    b'copies.read-from',
    default=b"filelog-only",
)
coreconfigitem(
    b'experimental',
    b'copies.write-to',
    default=b'filelog-only',
)
coreconfigitem(
    b'experimental',
    b'crecordtest',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'directaccess',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'directaccess.revnums',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'editortmpinhg',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'evolution',
    default=list,
)
coreconfigitem(
    b'experimental',
    b'evolution.allowdivergence',
    default=False,
    alias=[(b'experimental', b'allowdivergence')],
)
coreconfigitem(
    b'experimental',
    b'evolution.allowunstable',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'evolution.createmarkers',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'evolution.effect-flags',
    default=True,
    alias=[(b'experimental', b'effect-flags')],
)
coreconfigitem(
    b'experimental',
    b'evolution.exchange',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'evolution.bundle-obsmarker',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'evolution.bundle-obsmarker:mandatory',
    default=True,
)
coreconfigitem(
    b'experimental',
    b'log.topo',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'evolution.report-instabilities',
    default=True,
)
coreconfigitem(
    b'experimental',
    b'evolution.track-operation',
    default=True,
)
# repo-level config to exclude a revset visibility
#
# The target use case is to use `share` to expose different subset of the same
# repository, especially server side. See also `server.view`.
coreconfigitem(
    b'experimental',
    b'extra-filter-revs',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'maxdeltachainspan',
    default=-1,
)
# tracks files which were undeleted (merge might delete them but we explicitly
# kept/undeleted them) and creates new filenodes for them
coreconfigitem(
    b'experimental',
    b'merge-track-salvaged',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'mergetempdirprefix',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'mmapindexthreshold',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'narrow',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'nonnormalparanoidcheck',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'exportableenviron',
    default=list,
)
coreconfigitem(
    b'experimental',
    b'extendedheader.index',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'extendedheader.similarity',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'graphshorten',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'graphstyle.parent',
    default=dynamicdefault,
)
coreconfigitem(
    b'experimental',
    b'graphstyle.missing',
    default=dynamicdefault,
)
coreconfigitem(
    b'experimental',
    b'graphstyle.grandparent',
    default=dynamicdefault,
)
coreconfigitem(
    b'experimental',
    b'hook-track-tags',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'httppeer.advertise-v2',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'httppeer.v2-encoder-order',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'httppostargs',
    default=False,
)
coreconfigitem(b'experimental', b'nointerrupt', default=False)
coreconfigitem(b'experimental', b'nointerrupt-interactiveonly', default=True)

coreconfigitem(
    b'experimental',
    b'obsmarkers-exchange-debug',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'remotenames',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'removeemptydirs',
    default=True,
)
coreconfigitem(
    b'experimental',
    b'revert.interactive.select-to-keep',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'revisions.prefixhexnode',
    default=False,
)
# "out of experimental" todo list.
#
# * include management of a persistent nodemap in the main docket
# * enforce a "no-truncate" policy for mmap safety
#      - for censoring operation
#      - for stripping operation
#      - for rollback operation
# * proper streaming (race free) of the docket file
# * track garbage data to evemtually allow rewriting -existing- sidedata.
# * Exchange-wise, we will also need to do something more efficient than
#   keeping references to the affected revlogs, especially memory-wise when
#   rewriting sidedata.
# * introduce a proper solution to reduce the number of filelog related files.
# * use caching for reading sidedata (similar to what we do for data).
# * no longer set offset=0 if sidedata_size=0 (simplify cutoff computation).
# * Improvement to consider
#   - avoid compression header in chunk using the default compression?
#   - forbid "inline" compression mode entirely?
#   - split the data offset and flag field (the 2 bytes save are mostly trouble)
#   - keep track of uncompressed -chunk- size (to preallocate memory better)
#   - keep track of chain base or size (probably not that useful anymore)
coreconfigitem(
    b'experimental',
    b'revlogv2',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'revisions.disambiguatewithin',
    default=None,
)
coreconfigitem(
    b'experimental',
    b'rust.index',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'server.filesdata.recommended-batch-size',
    default=50000,
)
coreconfigitem(
    b'experimental',
    b'server.manifestdata.recommended-batch-size',
    default=100000,
)
coreconfigitem(
    b'experimental',
    b'server.stream-narrow-clones',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'single-head-per-branch',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'single-head-per-branch:account-closed-heads',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'single-head-per-branch:public-changes-only',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'sshserver.support-v2',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'sparse-read',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'sparse-read.density-threshold',
    default=0.50,
)
coreconfigitem(
    b'experimental',
    b'sparse-read.min-gap-size',
    default=b'65K',
)
coreconfigitem(
    b'experimental',
    b'treemanifest',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'update.atomic-file',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'sshpeer.advertise-v2',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'web.apiserver',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'web.api.http-v2',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'web.api.debugreflect',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'web.full-garbage-collection-rate',
    default=1,  # still forcing a full collection on each request
)
coreconfigitem(
    b'experimental',
    b'worker.wdir-get-thread-safe',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'worker.repository-upgrade',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'xdiff',
    default=False,
)
coreconfigitem(
    b'extensions',
    b'.*',
    default=None,
    generic=True,
)
coreconfigitem(
    b'extdata',
    b'.*',
    default=None,
    generic=True,
)
coreconfigitem(
    b'format',
    b'bookmarks-in-store',
    default=False,
)
coreconfigitem(
    b'format',
    b'chunkcachesize',
    default=None,
    experimental=True,
)
coreconfigitem(
    # Enable this dirstate format *when creating a new repository*.
    # Which format to use for existing repos is controlled by .hg/requires
    b'format',
    b'exp-dirstate-v2',
    default=False,
    experimental=True,
)
coreconfigitem(
    b'format',
    b'dotencode',
    default=True,
)
coreconfigitem(
    b'format',
    b'generaldelta',
    default=False,
    experimental=True,
)
coreconfigitem(
    b'format',
    b'manifestcachesize',
    default=None,
    experimental=True,
)
coreconfigitem(
    b'format',
    b'maxchainlen',
    default=dynamicdefault,
    experimental=True,
)
coreconfigitem(
    b'format',
    b'obsstore-version',
    default=None,
)
coreconfigitem(
    b'format',
    b'sparse-revlog',
    default=True,
)
coreconfigitem(
    b'format',
    b'revlog-compression',
    default=lambda: [b'zstd', b'zlib'],
    alias=[(b'experimental', b'format.compression')],
)
# Experimental TODOs:
#
# * Same as for evlogv2 (but for the reduction of the number of files)
# * Improvement to investigate
#   - storing .hgtags fnode
#   - storing `rank` of changesets
#   - storing branch related identifier

coreconfigitem(
    b'format',
    b'exp-use-changelog-v2',
    default=None,
    experimental=True,
)
coreconfigitem(
    b'format',
    b'usefncache',
    default=True,
)
coreconfigitem(
    b'format',
    b'usegeneraldelta',
    default=True,
)
coreconfigitem(
    b'format',
    b'usestore',
    default=True,
)


def _persistent_nodemap_default():
    """compute `use-persistent-nodemap` default value

    The feature is disabled unless a fast implementation is available.
    """
    from . import policy

    return policy.importrust('revlog') is not None


coreconfigitem(
    b'format',
    b'use-persistent-nodemap',
    default=_persistent_nodemap_default,
)
coreconfigitem(
    b'format',
    b'exp-use-copies-side-data-changeset',
    default=False,
    experimental=True,
)
coreconfigitem(
    b'format',
    b'use-share-safe',
    default=False,
)
coreconfigitem(
    b'format',
    b'internal-phase',
    default=False,
    experimental=True,
)
coreconfigitem(
    b'fsmonitor',
    b'warn_when_unused',
    default=True,
)
coreconfigitem(
    b'fsmonitor',
    b'warn_update_file_count',
    default=50000,
)
coreconfigitem(
    b'fsmonitor',
    b'warn_update_file_count_rust',
    default=400000,
)
coreconfigitem(
    b'help',
    br'hidden-command\..*',
    default=False,
    generic=True,
)
coreconfigitem(
    b'help',
    br'hidden-topic\..*',
    default=False,
    generic=True,
)
coreconfigitem(
    b'hooks',
    b'[^:]*',
    default=dynamicdefault,
    generic=True,
)
coreconfigitem(
    b'hooks',
    b'.*:run-with-plain',
    default=True,
    generic=True,
)
coreconfigitem(
    b'hgweb-paths',
    b'.*',
    default=list,
    generic=True,
)
coreconfigitem(
    b'hostfingerprints',
    b'.*',
    default=list,
    generic=True,
)
coreconfigitem(
    b'hostsecurity',
    b'ciphers',
    default=None,
)
coreconfigitem(
    b'hostsecurity',
    b'minimumprotocol',
    default=dynamicdefault,
)
coreconfigitem(
    b'hostsecurity',
    b'.*:minimumprotocol$',
    default=dynamicdefault,
    generic=True,
)
coreconfigitem(
    b'hostsecurity',
    b'.*:ciphers$',
    default=dynamicdefault,
    generic=True,
)
coreconfigitem(
    b'hostsecurity',
    b'.*:fingerprints$',
    default=list,
    generic=True,
)
coreconfigitem(
    b'hostsecurity',
    b'.*:verifycertsfile$',
    default=None,
    generic=True,
)

coreconfigitem(
    b'http_proxy',
    b'always',
    default=False,
)
coreconfigitem(
    b'http_proxy',
    b'host',
    default=None,
)
coreconfigitem(
    b'http_proxy',
    b'no',
    default=list,
)
coreconfigitem(
    b'http_proxy',
    b'passwd',
    default=None,
)
coreconfigitem(
    b'http_proxy',
    b'user',
    default=None,
)

coreconfigitem(
    b'http',
    b'timeout',
    default=None,
)

coreconfigitem(
    b'logtoprocess',
    b'commandexception',
    default=None,
)
coreconfigitem(
    b'logtoprocess',
    b'commandfinish',
    default=None,
)
coreconfigitem(
    b'logtoprocess',
    b'command',
    default=None,
)
coreconfigitem(
    b'logtoprocess',
    b'develwarn',
    default=None,
)
coreconfigitem(
    b'logtoprocess',
    b'uiblocked',
    default=None,
)
coreconfigitem(
    b'merge',
    b'checkunknown',
    default=b'abort',
)
coreconfigitem(
    b'merge',
    b'checkignored',
    default=b'abort',
)
coreconfigitem(
    b'experimental',
    b'merge.checkpathconflicts',
    default=False,
)
coreconfigitem(
    b'merge',
    b'followcopies',
    default=True,
)
coreconfigitem(
    b'merge',
    b'on-failure',
    default=b'continue',
)
coreconfigitem(
    b'merge',
    b'preferancestor',
    default=lambda: [b'*'],
    experimental=True,
)
coreconfigitem(
    b'merge',
    b'strict-capability-check',
    default=False,
)
coreconfigitem(
    b'merge-tools',
    b'.*',
    default=None,
    generic=True,
)
coreconfigitem(
    b'merge-tools',
    br'.*\.args$',
    default=b"$local $base $other",
    generic=True,
    priority=-1,
)
coreconfigitem(
    b'merge-tools',
    br'.*\.binary$',
    default=False,
    generic=True,
    priority=-1,
)
coreconfigitem(
    b'merge-tools',
    br'.*\.check$',
    default=list,
    generic=True,
    priority=-1,
)
coreconfigitem(
    b'merge-tools',
    br'.*\.checkchanged$',
    default=False,
    generic=True,
    priority=-1,
)
coreconfigitem(
    b'merge-tools',
    br'.*\.executable$',
    default=dynamicdefault,
    generic=True,
    priority=-1,
)
coreconfigitem(
    b'merge-tools',
    br'.*\.fixeol$',
    default=False,
    generic=True,
    priority=-1,
)
coreconfigitem(
    b'merge-tools',
    br'.*\.gui$',
    default=False,
    generic=True,
    priority=-1,
)
coreconfigitem(
    b'merge-tools',
    br'.*\.mergemarkers$',
    default=b'basic',
    generic=True,
    priority=-1,
)
coreconfigitem(
    b'merge-tools',
    br'.*\.mergemarkertemplate$',
    default=dynamicdefault,  # take from command-templates.mergemarker
    generic=True,
    priority=-1,
)
coreconfigitem(
    b'merge-tools',
    br'.*\.priority$',
    default=0,
    generic=True,
    priority=-1,
)
coreconfigitem(
    b'merge-tools',
    br'.*\.premerge$',
    default=dynamicdefault,
    generic=True,
    priority=-1,
)
coreconfigitem(
    b'merge-tools',
    br'.*\.symlink$',
    default=False,
    generic=True,
    priority=-1,
)
coreconfigitem(
    b'pager',
    b'attend-.*',
    default=dynamicdefault,
    generic=True,
)
coreconfigitem(
    b'pager',
    b'ignore',
    default=list,
)
coreconfigitem(
    b'pager',
    b'pager',
    default=dynamicdefault,
)
coreconfigitem(
    b'patch',
    b'eol',
    default=b'strict',
)
coreconfigitem(
    b'patch',
    b'fuzz',
    default=2,
)
coreconfigitem(
    b'paths',
    b'default',
    default=None,
)
coreconfigitem(
    b'paths',
    b'default-push',
    default=None,
)
coreconfigitem(
    b'paths',
    b'.*',
    default=None,
    generic=True,
)
coreconfigitem(
    b'phases',
    b'checksubrepos',
    default=b'follow',
)
coreconfigitem(
    b'phases',
    b'new-commit',
    default=b'draft',
)
coreconfigitem(
    b'phases',
    b'publish',
    default=True,
)
coreconfigitem(
    b'profiling',
    b'enabled',
    default=False,
)
coreconfigitem(
    b'profiling',
    b'format',
    default=b'text',
)
coreconfigitem(
    b'profiling',
    b'freq',
    default=1000,
)
coreconfigitem(
    b'profiling',
    b'limit',
    default=30,
)
coreconfigitem(
    b'profiling',
    b'nested',
    default=0,
)
coreconfigitem(
    b'profiling',
    b'output',
    default=None,
)
coreconfigitem(
    b'profiling',
    b'showmax',
    default=0.999,
)
coreconfigitem(
    b'profiling',
    b'showmin',
    default=dynamicdefault,
)
coreconfigitem(
    b'profiling',
    b'showtime',
    default=True,
)
coreconfigitem(
    b'profiling',
    b'sort',
    default=b'inlinetime',
)
coreconfigitem(
    b'profiling',
    b'statformat',
    default=b'hotpath',
)
coreconfigitem(
    b'profiling',
    b'time-track',
    default=dynamicdefault,
)
coreconfigitem(
    b'profiling',
    b'type',
    default=b'stat',
)
coreconfigitem(
    b'progress',
    b'assume-tty',
    default=False,
)
coreconfigitem(
    b'progress',
    b'changedelay',
    default=1,
)
coreconfigitem(
    b'progress',
    b'clear-complete',
    default=True,
)
coreconfigitem(
    b'progress',
    b'debug',
    default=False,
)
coreconfigitem(
    b'progress',
    b'delay',
    default=3,
)
coreconfigitem(
    b'progress',
    b'disable',
    default=False,
)
coreconfigitem(
    b'progress',
    b'estimateinterval',
    default=60.0,
)
coreconfigitem(
    b'progress',
    b'format',
    default=lambda: [b'topic', b'bar', b'number', b'estimate'],
)
coreconfigitem(
    b'progress',
    b'refresh',
    default=0.1,
)
coreconfigitem(
    b'progress',
    b'width',
    default=dynamicdefault,
)
coreconfigitem(
    b'pull',
    b'confirm',
    default=False,
)
coreconfigitem(
    b'push',
    b'pushvars.server',
    default=False,
)
coreconfigitem(
    b'rewrite',
    b'backup-bundle',
    default=True,
    alias=[(b'ui', b'history-editing-backup')],
)
coreconfigitem(
    b'rewrite',
    b'update-timestamp',
    default=False,
)
coreconfigitem(
    b'rewrite',
    b'empty-successor',
    default=b'skip',
    experimental=True,
)
coreconfigitem(
    b'storage',
    b'new-repo-backend',
    default=b'revlogv1',
    experimental=True,
)
coreconfigitem(
    b'storage',
    b'revlog.optimize-delta-parent-choice',
    default=True,
    alias=[(b'format', b'aggressivemergedeltas')],
)
coreconfigitem(
    b'storage',
    b'revlog.issue6528.fix-incoming',
    default=True,
)
# experimental as long as rust is experimental (or a C version is implemented)
coreconfigitem(
    b'storage',
    b'revlog.persistent-nodemap.mmap',
    default=True,
)
# experimental as long as format.use-persistent-nodemap is.
coreconfigitem(
    b'storage',
    b'revlog.persistent-nodemap.slow-path',
    default=b"abort",
)

coreconfigitem(
    b'storage',
    b'revlog.reuse-external-delta',
    default=True,
)
coreconfigitem(
    b'storage',
    b'revlog.reuse-external-delta-parent',
    default=None,
)
coreconfigitem(
    b'storage',
    b'revlog.zlib.level',
    default=None,
)
coreconfigitem(
    b'storage',
    b'revlog.zstd.level',
    default=None,
)
coreconfigitem(
    b'server',
    b'bookmarks-pushkey-compat',
    default=True,
)
coreconfigitem(
    b'server',
    b'bundle1',
    default=True,
)
coreconfigitem(
    b'server',
    b'bundle1gd',
    default=None,
)
coreconfigitem(
    b'server',
    b'bundle1.pull',
    default=None,
)
coreconfigitem(
    b'server',
    b'bundle1gd.pull',
    default=None,
)
coreconfigitem(
    b'server',
    b'bundle1.push',
    default=None,
)
coreconfigitem(
    b'server',
    b'bundle1gd.push',
    default=None,
)
coreconfigitem(
    b'server',
    b'bundle2.stream',
    default=True,
    alias=[(b'experimental', b'bundle2.stream')],
)
coreconfigitem(
    b'server',
    b'compressionengines',
    default=list,
)
coreconfigitem(
    b'server',
    b'concurrent-push-mode',
    default=b'check-related',
)
coreconfigitem(
    b'server',
    b'disablefullbundle',
    default=False,
)
coreconfigitem(
    b'server',
    b'maxhttpheaderlen',
    default=1024,
)
coreconfigitem(
    b'server',
    b'pullbundle',
    default=False,
)
coreconfigitem(
    b'server',
    b'preferuncompressed',
    default=False,
)
coreconfigitem(
    b'server',
    b'streamunbundle',
    default=False,
)
coreconfigitem(
    b'server',
    b'uncompressed',
    default=True,
)
coreconfigitem(
    b'server',
    b'uncompressedallowsecret',
    default=False,
)
coreconfigitem(
    b'server',
    b'view',
    default=b'served',
)
coreconfigitem(
    b'server',
    b'validate',
    default=False,
)
coreconfigitem(
    b'server',
    b'zliblevel',
    default=-1,
)
coreconfigitem(
    b'server',
    b'zstdlevel',
    default=3,
)
coreconfigitem(
    b'share',
    b'pool',
    default=None,
)
coreconfigitem(
    b'share',
    b'poolnaming',
    default=b'identity',
)
coreconfigitem(
    b'share',
    b'safe-mismatch.source-not-safe',
    default=b'abort',
)
coreconfigitem(
    b'share',
    b'safe-mismatch.source-safe',
    default=b'abort',
)
coreconfigitem(
    b'share',
    b'safe-mismatch.source-not-safe.warn',
    default=True,
)
coreconfigitem(
    b'share',
    b'safe-mismatch.source-safe.warn',
    default=True,
)
coreconfigitem(
    b'shelve',
    b'maxbackups',
    default=10,
)
coreconfigitem(
    b'smtp',
    b'host',
    default=None,
)
coreconfigitem(
    b'smtp',
    b'local_hostname',
    default=None,
)
coreconfigitem(
    b'smtp',
    b'password',
    default=None,
)
coreconfigitem(
    b'smtp',
    b'port',
    default=dynamicdefault,
)
coreconfigitem(
    b'smtp',
    b'tls',
    default=b'none',
)
coreconfigitem(
    b'smtp',
    b'username',
    default=None,
)
coreconfigitem(
    b'sparse',
    b'missingwarning',
    default=True,
    experimental=True,
)
coreconfigitem(
    b'subrepos',
    b'allowed',
    default=dynamicdefault,  # to make backporting simpler
)
coreconfigitem(
    b'subrepos',
    b'hg:allowed',
    default=dynamicdefault,
)
coreconfigitem(
    b'subrepos',
    b'git:allowed',
    default=dynamicdefault,
)
coreconfigitem(
    b'subrepos',
    b'svn:allowed',
    default=dynamicdefault,
)
coreconfigitem(
    b'templates',
    b'.*',
    default=None,
    generic=True,
)
coreconfigitem(
    b'templateconfig',
    b'.*',
    default=dynamicdefault,
    generic=True,
)
coreconfigitem(
    b'trusted',
    b'groups',
    default=list,
)
coreconfigitem(
    b'trusted',
    b'users',
    default=list,
)
coreconfigitem(
    b'ui',
    b'_usedassubrepo',
    default=False,
)
coreconfigitem(
    b'ui',
    b'allowemptycommit',
    default=False,
)
coreconfigitem(
    b'ui',
    b'archivemeta',
    default=True,
)
coreconfigitem(
    b'ui',
    b'askusername',
    default=False,
)
coreconfigitem(
    b'ui',
    b'available-memory',
    default=None,
)

coreconfigitem(
    b'ui',
    b'clonebundlefallback',
    default=False,
)
coreconfigitem(
    b'ui',
    b'clonebundleprefers',
    default=list,
)
coreconfigitem(
    b'ui',
    b'clonebundles',
    default=True,
)
coreconfigitem(
    b'ui',
    b'color',
    default=b'auto',
)
coreconfigitem(
    b'ui',
    b'commitsubrepos',
    default=False,
)
coreconfigitem(
    b'ui',
    b'debug',
    default=False,
)
coreconfigitem(
    b'ui',
    b'debugger',
    default=None,
)
coreconfigitem(
    b'ui',
    b'editor',
    default=dynamicdefault,
)
coreconfigitem(
    b'ui',
    b'detailed-exit-code',
    default=False,
    experimental=True,
)
coreconfigitem(
    b'ui',
    b'fallbackencoding',
    default=None,
)
coreconfigitem(
    b'ui',
    b'forcecwd',
    default=None,
)
coreconfigitem(
    b'ui',
    b'forcemerge',
    default=None,
)
coreconfigitem(
    b'ui',
    b'formatdebug',
    default=False,
)
coreconfigitem(
    b'ui',
    b'formatjson',
    default=False,
)
coreconfigitem(
    b'ui',
    b'formatted',
    default=None,
)
coreconfigitem(
    b'ui',
    b'interactive',
    default=None,
)
coreconfigitem(
    b'ui',
    b'interface',
    default=None,
)
coreconfigitem(
    b'ui',
    b'interface.chunkselector',
    default=None,
)
coreconfigitem(
    b'ui',
    b'large-file-limit',
    default=10000000,
)
coreconfigitem(
    b'ui',
    b'logblockedtimes',
    default=False,
)
coreconfigitem(
    b'ui',
    b'merge',
    default=None,
)
coreconfigitem(
    b'ui',
    b'mergemarkers',
    default=b'basic',
)
coreconfigitem(
    b'ui',
    b'message-output',
    default=b'stdio',
)
coreconfigitem(
    b'ui',
    b'nontty',
    default=False,
)
coreconfigitem(
    b'ui',
    b'origbackuppath',
    default=None,
)
coreconfigitem(
    b'ui',
    b'paginate',
    default=True,
)
coreconfigitem(
    b'ui',
    b'patch',
    default=None,
)
coreconfigitem(
    b'ui',
    b'portablefilenames',
    default=b'warn',
)
coreconfigitem(
    b'ui',
    b'promptecho',
    default=False,
)
coreconfigitem(
    b'ui',
    b'quiet',
    default=False,
)
coreconfigitem(
    b'ui',
    b'quietbookmarkmove',
    default=False,
)
coreconfigitem(
    b'ui',
    b'relative-paths',
    default=b'legacy',
)
coreconfigitem(
    b'ui',
    b'remotecmd',
    default=b'hg',
)
coreconfigitem(
    b'ui',
    b'report_untrusted',
    default=True,
)
coreconfigitem(
    b'ui',
    b'rollback',
    default=True,
)
coreconfigitem(
    b'ui',
    b'signal-safe-lock',
    default=True,
)
coreconfigitem(
    b'ui',
    b'slash',
    default=False,
)
coreconfigitem(
    b'ui',
    b'ssh',
    default=b'ssh',
)
coreconfigitem(
    b'ui',
    b'ssherrorhint',
    default=None,
)
coreconfigitem(
    b'ui',
    b'statuscopies',
    default=False,
)
coreconfigitem(
    b'ui',
    b'strict',
    default=False,
)
coreconfigitem(
    b'ui',
    b'style',
    default=b'',
)
coreconfigitem(
    b'ui',
    b'supportcontact',
    default=None,
)
coreconfigitem(
    b'ui',
    b'textwidth',
    default=78,
)
coreconfigitem(
    b'ui',
    b'timeout',
    default=b'600',
)
coreconfigitem(
    b'ui',
    b'timeout.warn',
    default=0,
)
coreconfigitem(
    b'ui',
    b'timestamp-output',
    default=False,
)
coreconfigitem(
    b'ui',
    b'traceback',
    default=False,
)
coreconfigitem(
    b'ui',
    b'tweakdefaults',
    default=False,
)
coreconfigitem(b'ui', b'username', alias=[(b'ui', b'user')])
coreconfigitem(
    b'ui',
    b'verbose',
    default=False,
)
coreconfigitem(
    b'verify',
    b'skipflags',
    default=None,
)
coreconfigitem(
    b'web',
    b'allowbz2',
    default=False,
)
coreconfigitem(
    b'web',
    b'allowgz',
    default=False,
)
coreconfigitem(
    b'web',
    b'allow-pull',
    alias=[(b'web', b'allowpull')],
    default=True,
)
coreconfigitem(
    b'web',
    b'allow-push',
    alias=[(b'web', b'allow_push')],
    default=list,
)
coreconfigitem(
    b'web',
    b'allowzip',
    default=False,
)
coreconfigitem(
    b'web',
    b'archivesubrepos',
    default=False,
)
coreconfigitem(
    b'web',
    b'cache',
    default=True,
)
coreconfigitem(
    b'web',
    b'comparisoncontext',
    default=5,
)
coreconfigitem(
    b'web',
    b'contact',
    default=None,
)
coreconfigitem(
    b'web',
    b'deny_push',
    default=list,
)
coreconfigitem(
    b'web',
    b'guessmime',
    default=False,
)
coreconfigitem(
    b'web',
    b'hidden',
    default=False,
)
coreconfigitem(
    b'web',
    b'labels',
    default=list,
)
coreconfigitem(
    b'web',
    b'logoimg',
    default=b'hglogo.png',
)
coreconfigitem(
    b'web',
    b'logourl',
    default=b'https://mercurial-scm.org/',
)
coreconfigitem(
    b'web',
    b'accesslog',
    default=b'-',
)
coreconfigitem(
    b'web',
    b'address',
    default=b'',
)
coreconfigitem(
    b'web',
    b'allow-archive',
    alias=[(b'web', b'allow_archive')],
    default=list,
)
coreconfigitem(
    b'web',
    b'allow_read',
    default=list,
)
coreconfigitem(
    b'web',
    b'baseurl',
    default=None,
)
coreconfigitem(
    b'web',
    b'cacerts',
    default=None,
)
coreconfigitem(
    b'web',
    b'certificate',
    default=None,
)
coreconfigitem(
    b'web',
    b'collapse',
    default=False,
)
coreconfigitem(
    b'web',
    b'csp',
    default=None,
)
coreconfigitem(
    b'web',
    b'deny_read',
    default=list,
)
coreconfigitem(
    b'web',
    b'descend',
    default=True,
)
coreconfigitem(
    b'web',
    b'description',
    default=b"",
)
coreconfigitem(
    b'web',
    b'encoding',
    default=lambda: encoding.encoding,
)
coreconfigitem(
    b'web',
    b'errorlog',
    default=b'-',
)
coreconfigitem(
    b'web',
    b'ipv6',
    default=False,
)
coreconfigitem(
    b'web',
    b'maxchanges',
    default=10,
)
coreconfigitem(
    b'web',
    b'maxfiles',
    default=10,
)
coreconfigitem(
    b'web',
    b'maxshortchanges',
    default=60,
)
coreconfigitem(
    b'web',
    b'motd',
    default=b'',
)
coreconfigitem(
    b'web',
    b'name',
    default=dynamicdefault,
)
coreconfigitem(
    b'web',
    b'port',
    default=8000,
)
coreconfigitem(
    b'web',
    b'prefix',
    default=b'',
)
coreconfigitem(
    b'web',
    b'push_ssl',
    default=True,
)
coreconfigitem(
    b'web',
    b'refreshinterval',
    default=20,
)
coreconfigitem(
    b'web',
    b'server-header',
    default=None,
)
coreconfigitem(
    b'web',
    b'static',
    default=None,
)
coreconfigitem(
    b'web',
    b'staticurl',
    default=None,
)
coreconfigitem(
    b'web',
    b'stripes',
    default=1,
)
coreconfigitem(
    b'web',
    b'style',
    default=b'paper',
)
coreconfigitem(
    b'web',
    b'templates',
    default=None,
)
coreconfigitem(
    b'web',
    b'view',
    default=b'served',
    experimental=True,
)
coreconfigitem(
    b'worker',
    b'backgroundclose',
    default=dynamicdefault,
)
# Windows defaults to a limit of 512 open files. A buffer of 128
# should give us enough headway.
coreconfigitem(
    b'worker',
    b'backgroundclosemaxqueue',
    default=384,
)
coreconfigitem(
    b'worker',
    b'backgroundcloseminfilecount',
    default=2048,
)
coreconfigitem(
    b'worker',
    b'backgroundclosethreadcount',
    default=4,
)
coreconfigitem(
    b'worker',
    b'enabled',
    default=True,
)
coreconfigitem(
    b'worker',
    b'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(
    b'commands',
    b'rebase.requiredest',
    default=False,
)
coreconfigitem(
    b'experimental',
    b'rebaseskipobsolete',
    default=True,
)
coreconfigitem(
    b'rebase',
    b'singletransaction',
    default=False,
)
coreconfigitem(
    b'rebase',
    b'experimental.inmemory',
    default=False,
)