usage: add configuration option to adjust resources usage

They currently do nothing, but this open the way to actually use them.

mercurial/configitems.toml

@@ -1,2879 +1,2937 b''
 # configitems.toml - centralized declaration of configuration options
 #
 # This file contains declarations of the core Mercurial configuration options.
 #
 # # Structure
 #
 # items: array of config items
 # templates: mapping of template name to template declaration
 # template-applications: array of template applications
 #
 # # Elements
 #
 # ## Item
 #
 # Declares a core Mercurial option.
 #
 # - section: string (required)
 # - name: string (required)
 # - default-type: boolean, changes how `default` is read
 # - default: any
 # - generic: boolean
 # - priority: integer, only if `generic` is true
 # - alias: list of 2-tuples of strings
 # - experimental: boolean
 # - documentation: string
 # - in_core_extension: string
 #
 # ## Template
 #
 # Declares a group of options to be re-used for multiple sections.
 #
 # - all the same fields as `Item`, except `section` and `name`
 # - `suffix` (string, required)
 #
 # ## Template applications
 #
 # Uses a `Template` to instanciate its options in a given section.
 #
 # - template: string (required, must match a `Template` name)
 # - section: string (required)
 
 [[items]]
 section = "alias"
 name = ".*"
 default-type = "dynamic"
 generic = true
 
 [[items]]
 section = "auth"
 name = "cookiefile"
 
 # bookmarks.pushing: internal hack for discovery
 [[items]]
 section = "bookmarks"
 name = "pushing"
 default-type = "list_type"
 
 # bundle.mainreporoot: internal hack for bundlerepo
 [[items]]
 section = "bundle"
 name = "mainreporoot"
 default = ""
 
 [[items]]
 section = "censor"
 name = "policy"
 default = "abort"
 experimental = true
 
 [[items]]
 section = "chgserver"
 name = "idletimeout"
 default = 3600
 
 [[items]]
 section = "chgserver"
 name = "skiphash"
 default = false
 
 [[items]]
 section = "cmdserver"
 name = "log"
 
 [[items]]
 section = "cmdserver"
 name = "max-log-files"
 default = 7
 
 [[items]]
 section = "cmdserver"
 name = "max-log-size"
 default = "1 MB"
 
 [[items]]
 section = "cmdserver"
 name = "max-repo-cache"
 default = 0
 experimental = true
 
 [[items]]
 section = "cmdserver"
 name = "message-encodings"
 default-type = "list_type"
 
 [[items]]
 section = "cmdserver"
 name = "shutdown-on-interrupt"
 default = true
 
 [[items]]
 section = "cmdserver"
 name = "track-log"
 default-type = "lambda"
 default = [ "chgserver", "cmdserver", "repocache",]
 
 [[items]]
 section = "color"
 name = ".*"
 generic = true
 
 [[items]]
 section = "color"
 name = "mode"
 default = "auto"
 
 [[items]]
 section = "color"
 name = "pagermode"
 default-type = "dynamic"
 
 [[items]]
 section = "command-templates"
 name = "graphnode"
 alias = [["ui", "graphnodetemplate"]]
 
 [[items]]
 section = "command-templates"
 name = "log"
 alias = [["ui", "logtemplate"]]
 
 [[items]]
 section = "command-templates"
 name = "mergemarker"
 default = '{node|short} {ifeq(tags, "tip", "", ifeq(tags, "", "", "{tags} "))}{if(bookmarks, "{bookmarks} ")}{ifeq(branch, "default", "", "{branch} ")}- {author|user}: {desc|firstline}'
 alias = [["ui", "mergemarkertemplate"]]
 
 [[items]]
 section = "command-templates"
 name = "oneline-summary"
 
 [[items]]
 section = "command-templates"
 name = "oneline-summary.*"
 default-type = "dynamic"
 generic = true
 
 [[items]]
 section = "command-templates"
 name = "pre-merge-tool-output"
 alias = [["ui", "pre-merge-tool-output-template"]]
 
 [[items]]
 section = "commands"
 name = "commit.post-status"
 default = false
 
 [[items]]
 section = "commands"
 name = "grep.all-files"
 default = false
 experimental = true
 
 [[items]]
 section = "commands"
 name = "merge.require-rev"
 default = false
 
 [[items]]
 section = "commands"
 name = "push.require-revs"
 default = false
 
 # 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.
 [[items]]
 section = "commands"
 name = "rebase.requiredest"
 default = false
 
 [[items]]
 section = "commands"
 name = "resolve.confirm"
 default = false
 
 [[items]]
 section = "commands"
 name = "resolve.explicit-re-merge"
 default = false
 
 [[items]]
 section = "commands"
 name = "resolve.mark-check"
 default = "none"
 
 [[items]]
 section = "commands"
 name = "show.aliasprefix"
 default-type = "list_type"
 
 [[items]]
 section = "commands"
 name = "status.relative"
 default = false
 
 [[items]]
 section = "commands"
 name = "status.skipstates"
 default = []
 experimental = true
 
 [[items]]
 section = "commands"
 name = "status.terse"
 default = ""
 
 [[items]]
 section = "commands"
 name = "status.verbose"
 default = false
 
 [[items]]
 section = "commands"
 name = "update.check"
 
 [[items]]
 section = "commands"
 name = "update.requiredest"
 default = false
 
 [[items]]
 section = "committemplate"
 name = ".*"
 generic = true
 
 [[items]]
 section = "convert"
 name = "bzr.saverev"
 default = true
 
 [[items]]
 section = "convert"
 name = "cvsps.cache"
 default = true
 
 [[items]]
 section = "convert"
 name = "cvsps.fuzz"
 default = 60
 
 [[items]]
 section = "convert"
 name = "cvsps.logencoding"
 
 [[items]]
 section = "convert"
 name = "cvsps.mergefrom"
 
 [[items]]
 section = "convert"
 name = "cvsps.mergeto"
 
 [[items]]
 section = "convert"
 name = "git.committeractions"
 default-type = "lambda"
 default = [ "messagedifferent",]
 
 [[items]]
 section = "convert"
 name = "git.extrakeys"
 default-type = "list_type"
 
 [[items]]
 section = "convert"
 name = "git.findcopiesharder"
 default = false
 
 [[items]]
 section = "convert"
 name = "git.remoteprefix"
 default = "remote"
 
 [[items]]
 section = "convert"
 name = "git.renamelimit"
 default = 400
 
 [[items]]
 section = "convert"
 name = "git.saverev"
 default = true
 
 [[items]]
 section = "convert"
 name = "git.similarity"
 default = 50
 
 [[items]]
 section = "convert"
 name = "git.skipsubmodules"
 default = false
 
 [[items]]
 section = "convert"
 name = "hg.clonebranches"
 default = false
 
 [[items]]
 section = "convert"
 name = "hg.ignoreerrors"
 default = false
 
 [[items]]
 section = "convert"
 name = "hg.preserve-hash"
 default = false
 
 [[items]]
 section = "convert"
 name = "hg.revs"
 
 [[items]]
 section = "convert"
 name = "hg.saverev"
 default = false
 
 [[items]]
 section = "convert"
 name = "hg.sourcename"
 
 [[items]]
 section = "convert"
 name = "hg.startrev"
 
 [[items]]
 section = "convert"
 name = "hg.tagsbranch"
 default = "default"
 
 [[items]]
 section = "convert"
 name = "hg.usebranchnames"
 default = true
 
 [[items]]
 section = "convert"
 name = "ignoreancestorcheck"
 default = false
 experimental = true
 
 [[items]]
 section = "convert"
 name = "localtimezone"
 default = false
 
 [[items]]
 section = "convert"
 name = "p4.encoding"
 default-type = "dynamic"
 
 [[items]]
 section = "convert"
 name = "p4.startrev"
 default = 0
 
 [[items]]
 section = "convert"
 name = "skiptags"
 default = false
 
 [[items]]
 section = "convert"
 name = "svn.branches"
 
 [[items]]
 section = "convert"
 name = "svn.dangerous-set-commit-dates"
 default = false
 
 [[items]]
 section = "convert"
 name = "svn.debugsvnlog"
 default = true
 
 [[items]]
 section = "convert"
 name = "svn.startrev"
 default = 0
 
 [[items]]
 section = "convert"
 name = "svn.tags"
 
 [[items]]
 section = "convert"
 name = "svn.trunk"
 
 [[items]]
 section = "debug"
 name = "bundling-stats"
 default = false
 documentation = "Display extra information about the bundling process."
 
 [[items]]
 section = "debug"
 name = "dirstate.delaywrite"
 default = 0
 
 [[items]]
 section = "debug"
 name = "revlog.debug-delta"
 default = false
 
 [[items]]
 section = "debug"
 name = "revlog.verifyposition.changelog"
 default = ""
 
 [[items]]
 section = "debug"
 name = "unbundling-stats"
 default = false
 documentation = "Display extra information about the unbundling process."
 
 [[items]]
 section = "defaults"
 name = ".*"
 generic = true
 
 [[items]]
 section = "devel"
 name = "all-warnings"
 default = false
 
 [[items]]
 section = "devel"
 name = "bundle.delta"
 default = ""
 
 [[items]]
 section = "devel"
 name = "bundle2.debug"
 default = false
 
 [[items]]
 section = "devel"
 name = "cache-vfs"
 
 [[items]]
 section = "devel"
 name = "check-locks"
 default = false
 
 [[items]]
 section = "devel"
 name = "check-relroot"
 default = false
 
 [[items]]
 section = "devel"
 name = "copy-tracing.multi-thread"
 default = true
 
 # Track copy information for all files, not just "added" ones (very slow)
 [[items]]
 section = "devel"
 name = "copy-tracing.trace-all-files"
 default = false
 
 [[items]]
 section = "devel"
 name = "debug.abort-update"
 default = false
 documentation = """If true, then any merge with the working copy, \
 e.g. [hg update], will be aborted after figuring out what needs to be done, \
 but before spawning the parallel worker."""
 
 [[items]]
 section = "devel"
 name = "debug.copies"
 default = false
 
 [[items]]
 section = "devel"
 name = "debug.extensions"
 default = false
 
 [[items]]
 section = "devel"
 name = "debug.peer-request"
 default = false
 
 [[items]]
 section = "devel"
 name = "debug.repo-filters"
 default = false
 
 [[items]]
 section = "devel"
 name = "default-date"
 
 [[items]]
 section = "devel"
 name = "deprec-warn"
 default = false
 
 # possible values:
 # - auto (the default)
 # - force-append
 # - force-new
 [[items]]
 section = "devel"
 name = "dirstate.v2.data_update_mode"
 default = "auto"
 
 [[items]]
 section = "devel"
 name = "disableloaddefaultcerts"
 default = false
 
 [[items]]
 section = "devel"
 name = "discovery.exchange-heads"
 default = true
 documentation = """If false, the discovery will not start with remote \
 head fetching and local head querying."""
 
 [[items]]
 section = "devel"
 name = "discovery.grow-sample"
 default = true
 documentation = """If false, the sample size used in set discovery \
 will not be increased through the process."""
 
 [[items]]
 section = "devel"
 name = "discovery.grow-sample.dynamic"
 default = true
 documentation = """If 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))`"""
 
 [[items]]
 section = "devel"
 name = "discovery.grow-sample.rate"
 default = 1.05
 documentation = "Controls the rate at which the sample grows."
 
 [[items]]
 section = "devel"
 name = "discovery.randomize"
 default = true
 documentation = """If false, random samplings during discovery are deterministic. \
 It is meant for integration tests."""
 
 [[items]]
 section = "devel"
 name = "discovery.sample-size"
 default = 200
 documentation = "Controls the initial size of the discovery sample."
 
 [[items]]
 section = "devel"
 name = "discovery.sample-size.initial"
 default = 100
 documentation = "Controls the initial size of the discovery for initial change."
 
 [[items]]
 section = "devel"
 name = "legacy.exchange"
 default-type = "list_type"
 
 [[items]]
 section = "devel"
 name = "persistent-nodemap"
 default = false
 documentation = """When true, revlogs use a special reference version of the \
 nodemap, that is not performant but is "known" to behave properly."""
 
 [[items]]
 section = "devel"
 name = "server-insecure-exact-protocol"
 default = ""
 
 [[items]]
 section = "devel"
 name = "servercafile"
 default = ""
 
 [[items]]
 section = "devel"
 name = "serverexactprotocol"
 default = ""
 
 [[items]]
 section = "devel"
 name = "serverrequirecert"
 default = false
 
 [[items]]
 section = "devel"
 name = "strip-obsmarkers"
 default = true
 
 [[items]]
 section = 'devel'
 name = 'sync.status.pre-dirstate-write-file'
 documentation = """
 Makes the status algorithm wait for the existence of this file \
 (or until a timeout of `devel.sync.status.pre-dirstate-write-file-timeout` \
 seconds) before taking the lock and writing the dirstate. \
 Status signals that it's ready to wait by creating a file \
 with the same name + `.waiting`. \
 Useful when testing race conditions."""
 
 [[items]]
 section = 'devel'
 name = 'sync.status.pre-dirstate-write-file-timeout'
 default=2
 
 [[items]]
 section = 'devel'
 name = 'sync.dirstate.post-docket-read-file'
 
 [[items]]
 section = 'devel'
 name = 'sync.dirstate.post-docket-read-file-timeout'
 default=2
 
 [[items]]
 section = 'devel'
 name = 'sync.dirstate.pre-read-file'
 
 [[items]]
 section = 'devel'
 name = 'sync.dirstate.pre-read-file-timeout'
 default=2
 
 [[items]]
 section = "devel"
 name = "user.obsmarker"
 
 [[items]]
 section = "devel"
 name = "warn-config"
 
 [[items]]
 section = "devel"
 name = "warn-config-default"
 
 [[items]]
 section = "devel"
 name = "warn-config-unknown"
 
 [[items]]
 section = "devel"
 name = "warn-empty-changegroup"
 default = false
 
 [[items]]
 section = "diff"
 name = "merge"
 default = false
 experimental = true
 
 [[items]]
 section = "email"
 name = "bcc"
 
 [[items]]
 section = "email"
 name = "cc"
 
 [[items]]
 section = "email"
 name = "charsets"
 default-type = "list_type"
 
 [[items]]
 section = "email"
 name = "from"
 
 [[items]]
 section = "email"
 name = "method"
 default = "smtp"
 
 [[items]]
 section = "email"
 name = "reply-to"
 
 [[items]]
 section = "email"
 name = "to"
 
 [[items]]
 section = "experimental"
 name = "archivemetatemplate"
 default-type = "dynamic"
 
 [[items]]
 section = "experimental"
 name = "auto-publish"
 default = "publish"
 
 [[items]]
 section = "experimental"
 name = "bundle-phases"
 default = false
 
 [[items]]
 section = "experimental"
 name = "bundle2-advertise"
 default = true
 
 [[items]]
 section = "experimental"
 name = "bundle2-output-capture"
 default = false
 
 [[items]]
 section = "experimental"
 name = "bundle2.pushback"
 default = false
 
 [[items]]
 section = "experimental"
 name = "bundle2lazylocking"
 default = false
 
 [[items]]
 section = "experimental"
 name = "bundlecomplevel"
 
 [[items]]
 section = "experimental"
 name = "bundlecomplevel.bzip2"
 
 [[items]]
 section = "experimental"
 name = "bundlecomplevel.gzip"
 
 [[items]]
 section = "experimental"
 name = "bundlecomplevel.none"
 
 [[items]]
 section = "experimental"
 name = "bundlecomplevel.zstd"
 
 [[items]]
 section = "experimental"
 name = "bundlecompthreads"
 
 [[items]]
 section = "experimental"
 name = "bundlecompthreads.bzip2"
 
 [[items]]
 section = "experimental"
 name = "bundlecompthreads.gzip"
 
 [[items]]
 section = "experimental"
 name = "bundlecompthreads.none"
 
 [[items]]
 section = "experimental"
 name = "bundlecompthreads.zstd"
 
 [[items]]
 section = "experimental"
 name = "changegroup3"
 default = true
 
 [[items]]
 section = "experimental"
 name = "changegroup4"
 default = false
 
 # might remove rank configuration once the computation has no impact
 [[items]]
 section = "experimental"
 name = "changelog-v2.compute-rank"
 default = true
 
 [[items]]
 section = "experimental"
 name = "cleanup-as-archived"
 default = false
 
 [[items]]
 section = "experimental"
 name = "clientcompressionengines"
 default-type = "list_type"
 
 [[items]]
 section = "experimental"
 name = "copies.read-from"
 default = "filelog-only"
 
 [[items]]
 section = "experimental"
 name = "copies.write-to"
 default = "filelog-only"
 
 [[items]]
 section = "experimental"
 name = "copytrace"
 default = "on"
 
 [[items]]
 section = "experimental"
 name = "copytrace.movecandidateslimit"
 default = 100
 
 [[items]]
 section = "experimental"
 name = "copytrace.sourcecommitlimit"
 default = 100
 
 [[items]]
 section = "experimental"
 name = "crecordtest"
 
 [[items]]
 section = "experimental"
 name = "directaccess"
 default = false
 
 [[items]]
 section = "experimental"
 name = "directaccess.revnums"
 default = false
 
 [[items]]
 section = "experimental"
 name = "editortmpinhg"
 default = false
 
 [[items]]
 section = "experimental"
 name = "evolution"
 default-type = "list_type"
 
 [[items]]
 section = "experimental"
 name = "evolution.allowdivergence"
 default = false
 alias = [["experimental", "allowdivergence"]]
 
 [[items]]
 section = "experimental"
 name = "evolution.allowunstable"
 
 [[items]]
 section = "experimental"
 name = "evolution.bundle-obsmarker"
 default = false
 
 [[items]]
 section = "experimental"
 name = "evolution.bundle-obsmarker:mandatory"
 default = true
 
 [[items]]
 section = "experimental"
 name = "evolution.createmarkers"
 
 [[items]]
 section = "experimental"
 name = "evolution.effect-flags"
 default = true
 alias = [["experimental", "effect-flags"]]
 
 [[items]]
 section = "experimental"
 name = "evolution.exchange"
 
 [[items]]
 section = "experimental"
 name = "evolution.report-instabilities"
 default = true
 
 [[items]]
 section = "experimental"
 name = "evolution.track-operation"
 default = true
 
 [[items]]
 section = "experimental"
 name = "exportableenviron"
 default-type = "list_type"
 
 [[items]]
 section = "experimental"
 name = "extendedheader.index"
 
 [[items]]
 section = "experimental"
 name = "extendedheader.similarity"
 default = false
 
 [[items]]
 section = "experimental"
 name = "extra-filter-revs"
 documentation = """Repo-level config to prevent a revset from being visible.
 The target use case is to use `share` to expose different subsets of the same \
 repository, especially server side. See also `server.view`."""
 
 [[items]]
 section = "experimental"
 name = "graphshorten"
 default = false
 
 [[items]]
 section = "experimental"
 name = "graphstyle.grandparent"
 default-type = "dynamic"
 
 [[items]]
 section = "experimental"
 name = "graphstyle.missing"
 default-type = "dynamic"
 
 [[items]]
 section = "experimental"
 name = "graphstyle.parent"
 default-type = "dynamic"
 
 [[items]]
 section = "experimental"
 name = "hook-track-tags"
 default = false
 
 [[items]]
 section = "experimental"
 name = "httppostargs"
 default = false
 
 [[items]]
 section = "experimental"
 name = "log.topo"
 default = false
 
 [[items]]
 section = "experimental"
 name = "maxdeltachainspan"
 default = -1
 
 [[items]]
 section = "experimental"
 name = "merge-track-salvaged"
 default = false
 documentation = """Tracks files which were undeleted (merge might delete them \
 but we explicitly kept/undeleted them) and creates new filenodes for them."""
 
 [[items]]
 section = "experimental"
 name = "merge.checkpathconflicts"
 default = false
 
 [[items]]
 section = "experimental"
 name = "mmapindexthreshold"
 
 [[items]]
 section = "experimental"
 name = "narrow"
 default = false
 
 [[items]]
 section = "experimental"
 name = "nointerrupt"
 default = false
 
 [[items]]
 section = "experimental"
 name = "nointerrupt-interactiveonly"
 default = true
 
 [[items]]
 section = "experimental"
 name = "nonnormalparanoidcheck"
 default = false
 
 [[items]]
 section = "experimental"
 name = "obsmarkers-exchange-debug"
 default = false
 
 [[items]]
 section = "experimental"
 name = "rebaseskipobsolete"
 default = true
 
 [[items]]
 section = "experimental"
 name = "remotenames"
 default = false
 
 [[items]]
 section = "experimental"
 name = "removeemptydirs"
 default = true
 
 [[items]]
 section = "experimental"
 name = "revert.interactive.select-to-keep"
 default = false
 
 [[items]]
 section = "experimental"
 name = "revisions.disambiguatewithin"
 
 [[items]]
 section = "experimental"
 name = "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)
 [[items]]
 section = "experimental"
 name = "revlogv2"
 
 [[items]]
 section = "experimental"
 name = "rust.index"
 default = false
 
 [[items]]
 section = "experimental"
 name = "server.allow-hidden-access"
 default-type = "list_type"
 
 [[items]]
 section = "experimental"
 name = "server.filesdata.recommended-batch-size"
 default = 50000
 
 [[items]]
 section = "experimental"
 name = "server.manifestdata.recommended-batch-size"
 default = 100000
 
 [[items]]
 section = "experimental"
 name = "server.stream-narrow-clones"
 default = false
 
 [[items]]
 section = "experimental"
 name = "single-head-per-branch"
 default = false
 
 [[items]]
 section = "experimental"
 name = "single-head-per-branch:account-closed-heads"
 default = false
 
 [[items]]
 section = "experimental"
 name = "single-head-per-branch:public-changes-only"
 default = false
 
 [[items]]
 section = "experimental"
 name = "sparse-read"
 default = false
 
 [[items]]
 section = "experimental"
 name = "sparse-read.density-threshold"
 default = 0.5
 
 [[items]]
 section = "experimental"
 name = "sparse-read.min-gap-size"
 default = "65K"
 
 [[items]]
 section = "experimental"
 name = "revlog.uncompressed-cache.enabled"
 default = true
 experimental = true
 documentation = """Enable some caching of uncompressed chunk, greatly boosting
 performance at the cost of memory usage."""
 
 [[items]]
 section = "experimental"
 name = "revlog.uncompressed-cache.factor"
 default = 4
 experimental = true
 documentation = """The size of the cache compared to the largest revision seen."""
 
 [[items]]
 section = "experimental"
 name = "revlog.uncompressed-cache.count"
 default = 10000
 experimental = true
 documentation = """The number of chunk cached."""
 
 [[items]]
 section = "experimental"
 name = "stream-v3"
 default = false
 
 [[items]]
 section = "experimental"
 name = "treemanifest"
 default = false
 
 [[items]]
 section = "experimental"
 name = "update.atomic-file"
 default = false
 
 [[items]]
 section = "experimental"
 name = "web.full-garbage-collection-rate"
 default = 1  # still forcing a full collection on each request
 
 [[items]]
 section = "experimental"
 name = "worker.repository-upgrade"
 default = false
 
 [[items]]
 section = "experimental"
 name = "worker.wdir-get-thread-safe"
 default = false
 
 [[items]]
 section = "experimental"
 name = "xdiff"
 default = false
 
 [[items]]
 section = "extdata"
 name = ".*"
 generic = true
 
 [[items]]
 section = "extensions"
 name = "[^:]*"
 generic = true
 
 [[items]]
 section = "extensions"
 name = "[^:]*:required"
 default = false
 generic = true
 
 [[items]]
 section = "format"
 name = "bookmarks-in-store"
 default = false
 
 [[items]]
 section = "format"
 name = "chunkcachesize"
 experimental = true
 
 [[items]]
 section = "format"
 name = "dotencode"
 default = true
 
 # The interaction between the archived phase and obsolescence markers needs to
 # be sorted out before wider usage of this are to be considered.
 #
 # At the time this message is written, behavior when archiving obsolete
 # changeset differ significantly from stripping. As part of stripping, we also
 # remove the obsolescence marker associated to the stripped changesets,
 # revealing the precedecessors changesets when applicable. When archiving, we
 # don't touch the obsolescence markers, keeping everything hidden. This can
 # result in quite confusing situation for people combining exchanging draft
 # with the archived phases. As some markers needed by others may be skipped
 # during exchange.
 [[items]]
 section = "format"
 name = "exp-archived-phase"
 default = false
 experimental = true
 
 # Experimental TODOs:
 #
 # * Same as for revlogv2 (but for the reduction of the number of files)
 # * Actually computing the rank of changesets
 # * Improvement to investigate
 #   - storing .hgtags fnode
 #   - storing branch related identifier
 [[items]]
 section = "format"
 name = "exp-use-changelog-v2"
 experimental = true
 
 [[items]]
 section = "format"
 name = "exp-use-copies-side-data-changeset"
 default = false
 experimental = true
 
 [[items]]
 section = "format"
 name = "generaldelta"
 default = false
 experimental = true
 
 [[items]]
 section = "format"
 name = "manifestcachesize"
 experimental = true
 
 [[items]]
 section = "format"
 name = "maxchainlen"
 default-type = "dynamic"
 experimental = true
 
 [[items]]
 section = "format"
 name = "obsstore-version"
 
 [[items]]
 section = "format"
 name = "revlog-compression"
 default-type = "lambda"
 alias = [["experimental", "format.compression"]]
 default = [ "zstd", "zlib",]
 
 [[items]]
 section = "format"
 name = "sparse-revlog"
 default = true
 
 [[items]]
 section = "format"
 name = "use-dirstate-tracked-hint"
 default = false
 experimental = true
 
 [[items]]
 section = "format"
 name = "use-dirstate-tracked-hint.automatic-upgrade-of-mismatching-repositories"
 default = false
 experimental = true
 
 [[items]]
 section = "format"
 name = "use-dirstate-tracked-hint.automatic-upgrade-of-mismatching-repositories:quiet"
 default = false
 experimental = true
 
 [[items]]
 section = "format"
 name = "use-dirstate-tracked-hint.version"
 default = 1
 experimental = true
 
 [[items]]
 section = "format"
 name = "use-dirstate-v2"
 default = false
 alias = [["format", "exp-rc-dirstate-v2"]]
 experimental = true
 documentation = """Enables dirstate-v2 format *when creating a new repository*.
 Which format to use for existing repos is controlled by `.hg/requires`."""
 
 [[items]]
 section = "format"
 name = "use-dirstate-v2.automatic-upgrade-of-mismatching-repositories"
 default = false
 experimental = true
 
 [[items]]
 section = "format"
 name = "use-dirstate-v2.automatic-upgrade-of-mismatching-repositories:quiet"
 default = false
 experimental = true
 
 # Having this on by default means we are confident about the scaling of phases.
 # This is not garanteed to be the case at the time this message is written.
 [[items]]
 section = "format"
 name = "use-internal-phase"
 default = false
 experimental = true
 
 [[items]]
 section = "format"
 name = "use-persistent-nodemap"
 default-type = "dynamic"
 
 [[items]]
 section = "format"
 name = "use-share-safe"
 default = true
 
 [[items]]
 section = "format"
 name = "use-share-safe.automatic-upgrade-of-mismatching-repositories"
 default = false
 experimental = true
 
 [[items]]
 section = "format"
 name = "use-share-safe.automatic-upgrade-of-mismatching-repositories:quiet"
 default = false
 experimental = true
 
 [[items]]
 section = "format"
 name = "usefncache"
 default = true
 
 [[items]]
 section = "format"
 name = "usegeneraldelta"
 default = true
 
 [[items]]
 section = "format"
 name = "usestore"
 default = true
 
 [[items]]
 section = "fsmonitor"
 name = "warn_update_file_count"
 default = 50000
 
 [[items]]
 section = "fsmonitor"
 name = "warn_update_file_count_rust"
 default = 400000
 
 [[items]]
 section = "fsmonitor"
 name = "warn_when_unused"
 default = true
 
 [[items]]
 section = "help"
 name = 'hidden-command\..*'
 default = false
 generic = true
 
 [[items]]
 section = "help"
 name = 'hidden-topic\..*'
 default = false
 generic = true
 
 [[items]]
 section = "hgweb-paths"
 name = ".*"
 default-type = "list_type"
 generic = true
 
 [[items]]
 section = "hooks"
 name = ".*:run-with-plain"
 default = true
 generic = true
 
 [[items]]
 section = "hooks"
 name = "[^:]*"
 default-type = "dynamic"
 generic = true
 
 [[items]]
 section = "hostfingerprints"
 name = ".*"
 default-type = "list_type"
 generic = true
 
 [[items]]
 section = "hostsecurity"
 name = ".*:ciphers$"
 default-type = "dynamic"
 generic = true
 
 [[items]]
 section = "hostsecurity"
 name = ".*:fingerprints$"
 default-type = "list_type"
 generic = true
 
 [[items]]
 section = "hostsecurity"
 name = ".*:minimumprotocol$"
 default-type = "dynamic"
 generic = true
 
 [[items]]
 section = "hostsecurity"
 name = ".*:verifycertsfile$"
 generic = true
 
 [[items]]
 section = "hostsecurity"
 name = "ciphers"
 
 [[items]]
 section = "hostsecurity"
 name = "minimumprotocol"
 default-type = "dynamic"
 
 [[items]]
 section = "http"
 name = "timeout"
 
 [[items]]
 section = "http_proxy"
 name = "always"
 default = false
 
 [[items]]
 section = "http_proxy"
 name = "host"
 
 [[items]]
 section = "http_proxy"
 name = "no"
 default-type = "list_type"
 
 [[items]]
 section = "http_proxy"
 name = "passwd"
 
 [[items]]
 section = "http_proxy"
 name = "user"
 
 [[items]]
 section = "logtoprocess"
 name = "command"
 
 [[items]]
 section = "logtoprocess"
 name = "commandexception"
 
 [[items]]
 section = "logtoprocess"
 name = "commandfinish"
 
 [[items]]
 section = "logtoprocess"
 name = "develwarn"
 
 [[items]]
 section = "logtoprocess"
 name = "uiblocked"
 
 [[items]]
 section = "merge"
 name = "checkignored"
 default = "abort"
 
 [[items]]
 section = "merge"
 name = "checkunknown"
 default = "abort"
 
 [[items]]
 section = "merge"
 name = "disable-partial-tools"
 default = false
 experimental = true
 
 [[items]]
 section = "merge"
 name = "followcopies"
 default = true
 
 [[items]]
 section = "merge"
 name = "on-failure"
 default = "continue"
 
 [[items]]
 section = "merge"
 name = "preferancestor"
 default-type = "lambda"
 default = ["*"]
 experimental = true
 
 [[items]]
 section = "merge"
 name = "strict-capability-check"
 default = false
 
 [[items]]
 section = "merge-tools"
 name = ".*"
 generic = true
 
 [[items]]
 section = "merge-tools"
 name = '.*\.args$'
 default = "$local $base $other"
 generic = true
 priority = -1
 
 [[items]]
 section = "merge-tools"
 name = '.*\.binary$'
 default = false
 generic = true
 priority = -1
 
 [[items]]
 section = "merge-tools"
 name = '.*\.check$'
 default-type = "list_type"
 generic = true
 priority = -1
 
 [[items]]
 section = "merge-tools"
 name = '.*\.checkchanged$'
 default = false
 generic = true
 priority = -1
 
 [[items]]
 section = "merge-tools"
 name = '.*\.executable$'
 default-type = "dynamic"
 generic = true
 priority = -1
 
 [[items]]
 section = "merge-tools"
 name = '.*\.fixeol$'
 default = false
 generic = true
 priority = -1
 
 [[items]]
 section = "merge-tools"
 name = '.*\.gui$'
 default = false
 generic = true
 priority = -1
 
 [[items]]
 section = "merge-tools"
 name = '.*\.mergemarkers$'
 default = "basic"
 generic = true
 priority = -1
 
 [[items]]
 section = "merge-tools"
 name = '.*\.mergemarkertemplate$'  # take from command-templates.mergemarker
 default-type = "dynamic"
 generic = true
 priority = -1
 
 [[items]]
 section = "merge-tools"
 name = '.*\.premerge$'
 default-type = "dynamic"
 generic = true
 priority = -1
 
 [[items]]
 section = "merge-tools"
 name = '.*\.priority$'
 default = 0
 generic = true
 priority = -1
 
 [[items]]
 section = "merge-tools"
 name = '.*\.regappend$'
 default = ""
 generic = true
 priority = -1
 
 [[items]]
 section = "merge-tools"
 name = '.*\.symlink$'
 default = false
 generic = true
 priority = -1
 
 [[items]]
 section = "pager"
 name = "attend-.*"
 default-type = "dynamic"
 generic = true
 
 [[items]]
 section = "pager"
 name = "ignore"
 default-type = "list_type"
 
 [[items]]
 section = "pager"
 name = "pager"
 default-type = "dynamic"
 
 [[items]]
 section = "partial-merge-tools"
 name = ".*"
 generic = true
 experimental = true
 
 [[items]]
 section = "partial-merge-tools"
 name = '.*\.args'
 default = "$local $base $other"
 generic = true
 priority = -1
 experimental = true
 
 [[items]]
 section = "partial-merge-tools"
 name = '.*\.disable'
 default = false
 generic = true
 priority = -1
 experimental = true
 
 [[items]]
 section = "partial-merge-tools"
 name = '.*\.executable$'
 default-type = "dynamic"
 generic = true
 priority = -1
 experimental = true
 
 [[items]]
 section = "partial-merge-tools"
 name = '.*\.order'
 default = 0
 generic = true
 priority = -1
 experimental = true
 
 [[items]]
 section = "partial-merge-tools"
 name = '.*\.patterns'
 default-type = "dynamic"
 generic = true
 priority = -1
 experimental = true
 
 [[items]]
 section = "patch"
 name = "eol"
 default = "strict"
 
 [[items]]
 section = "patch"
 name = "fuzz"
 default = 2
 
 [[items]]
 section = "paths"
 name = "[^:]*"
 generic = true
 
 [[items]]
 section = "paths"
 name = ".*:bookmarks.mode"
 default = "default"
 generic = true
 
 [[items]]
 section = "paths"
 name = ".*:multi-urls"
 default = false
 generic = true
 
 [[items]]
 section = "paths"
 name = ".*:pulled-delta-reuse-policy"
 generic = true
 
 [[items]]
 section = "paths"
 name = ".*:pushrev"
 generic = true
 
 [[items]]
 section = "paths"
 name = ".*:pushurl"
 generic = true
 
 [[items]]
 section = "paths"
 name = "default"
 
 [[items]]
 section = "paths"
 name = "default-push"
 
 [[items]]
 section = "phases"
 name = "checksubrepos"
 default = "follow"
 
 [[items]]
 section = "phases"
 name = "new-commit"
 default = "draft"
 
 [[items]]
 section = "phases"
 name = "publish"
 default = true
 
 [[items]]
 section = "profiling"
 name = "enabled"
 default = false
 
 [[items]]
 section = "profiling"
 name = "format"
 default = "text"
 
 [[items]]
 section = "profiling"
 name = "freq"
 default = 1000
 
 [[items]]
 section = "profiling"
 name = "limit"
 default = 30
 
 [[items]]
 section = "profiling"
 name = "nested"
 default = 0
 
 [[items]]
 section = "profiling"
 name = "output"
 
 [[items]]
 section = "profiling"
 name = "showmax"
 default = 0.999
 
 [[items]]
 section = "profiling"
 name = "showmin"
 default-type = "dynamic"
 
 [[items]]
 section = "profiling"
 name = "showtime"
 default = true
 
 [[items]]
 section = "profiling"
 name = "sort"
 default = "inlinetime"
 
 [[items]]
 section = "profiling"
 name = "statformat"
 default = "hotpath"
 
 [[items]]
 section = "profiling"
 name = "time-track"
 default-type = "dynamic"
 
 [[items]]
 section = "profiling"
 name = "type"
 default = "stat"
 
 [[items]]
 section = "progress"
 name = "assume-tty"
 default = false
 
 [[items]]
 section = "progress"
 name = "changedelay"
 default = 1
 
 [[items]]
 section = "progress"
 name = "clear-complete"
 default = true
 
 [[items]]
 section = "progress"
 name = "debug"
 default = false
 
 [[items]]
 section = "progress"
 name = "delay"
 default = 3
 
 [[items]]
 section = "progress"
 name = "disable"
 default = false
 
 [[items]]
 section = "progress"
 name = "estimateinterval"
 default = 60.0
 
 [[items]]
 section = "progress"
 name = "format"
 default-type = "lambda"
 default = [ "topic", "bar", "number", "estimate",]
 
 [[items]]
 section = "progress"
 name = "refresh"
 default = 0.1
 
 [[items]]
 section = "progress"
 name = "width"
 default-type = "dynamic"
 
 [[items]]
 section = "pull"
 name = "confirm"
 default = false
 
 [[items]]
 section = "push"
 name = "pushvars.server"
 default = false
 
 [[items]]
 section = "rebase"
 name = "experimental.inmemory"
 default = false
 
 [[items]]
 section = "rebase"
 name = "singletransaction"
 default = false
 
 [[items]]
 section = "rebase"
 name = "store-source"
 default = true
 experimental = true
 documentation = """Controls creation of a `rebase_source` extra field during rebase.
 When false, no such field is created. This is useful e.g. for incrementally \
 converting changesets and then rebasing them onto an existing repo.
 WARNING: this is an advanced setting reserved for people who know \
 exactly what they are doing. Misuse of this setting can easily \
 result in obsmarker cycles and a vivid headache."""
 
 [[items]]
 section = "rewrite"
 name = "backup-bundle"
 default = true
 alias = [["ui", "history-editing-backup"]]
 
 [[items]]
 section = "rewrite"
 name = "empty-successor"
 default = "skip"
 experimental = true
 
 [[items]]
 section = "rewrite"
 name = "update-timestamp"
 default = false
 
 [[items]]
 section = "rhg"
 name = "cat"
 default = true
 experimental = true
 documentation = """rhg cat has some quirks that need to be ironed out. \
 In particular, the `-r` argument accepts a partial hash, but does not \
 correctly resolve `abcdef` as a potential bookmark, tag or branch name."""
 
 [[items]]
 section = "rhg"
 name = "fallback-exectutable"
 experimental = true
 
 [[items]]
 section = "rhg"
 name = "fallback-immediately"
 default = false
 experimental = true
 
 [[items]]
 section = "rhg"
 name = "ignored-extensions"
 default-type = "list_type"
 experimental = true
 
 [[items]]
 section = "rhg"
 name = "on-unsupported"
 default = "abort"
 experimental = true
 
 [[items]]
 section = "server"
 name = "bookmarks-pushkey-compat"
 default = true
 
 [[items]]
 section = "server"
 name = "bundle1"
 default = true
 
 [[items]]
 section = "server"
 name = "bundle1.pull"
 
 [[items]]
 section = "server"
 name = "bundle1.push"
 
 [[items]]
 section = "server"
 name = "bundle1gd"
 
 [[items]]
 section = "server"
 name = "bundle1gd.pull"
 
 [[items]]
 section = "server"
 name = "bundle1gd.push"
 
 [[items]]
 section = "server"
 name = "bundle2.stream"
 default = true
 alias = [["experimental", "bundle2.stream"]]
 
 [[items]]
 section = "server"
 name = "compressionengines"
 default-type = "list_type"
 
 [[items]]
 section = "server"
 name = "concurrent-push-mode"
 default = "check-related"
 
 [[items]]
 section = "server"
 name = "disablefullbundle"
 default = false
 
 [[items]]
 section = "server"
 name = "maxhttpheaderlen"
 default = 1024
 
 [[items]]
 section = "server"
 name = "preferuncompressed"
 default = false
 
 [[items]]
 section = "server"
 name = "pullbundle"
 default = true
 
 [[items]]
 section = "server"
 name = "streamunbundle"
 default = false
 
 [[items]]
 section = "server"
 name = "uncompressed"
 default = true
 
 [[items]]
 section = "server"
 name = "uncompressedallowsecret"
 default = false
 
 [[items]]
 section = "server"
 name = "validate"
 default = false
 
 [[items]]
 section = "server"
 name = "view"
 default = "served"
 
 [[items]]
 section = "server"
 name = "zliblevel"
 default = -1
 
 [[items]]
 section = "server"
 name = "zstdlevel"
 default = 3
 
 [[items]]
 section = "share"
 name = "pool"
 
 [[items]]
 section = "share"
 name = "poolnaming"
 default = "identity"
 
 [[items]]
 section = "share"
 name = "safe-mismatch.source-not-safe"
 default = "abort"
 
 [[items]]
 section = "share"
 name = "safe-mismatch.source-not-safe.warn"
 default = true
 
 [[items]]
 section = "share"
 name = "safe-mismatch.source-not-safe:verbose-upgrade"
 default = true
 
 [[items]]
 section = "share"
 name = "safe-mismatch.source-safe"
 default = "abort"
 
 [[items]]
 section = "share"
 name = "safe-mismatch.source-safe.warn"
 default = true
 
 [[items]]
 section = "share"
 name = "safe-mismatch.source-safe:verbose-upgrade"
 default = true
 
 [[items]]
 section = "shelve"
 name = "maxbackups"
 default = 10
 
 [[items]]
 section = "shelve"
 name = "store"
 default = "internal"
 experimental = true
 
 [[items]]
 section = "smtp"
 name = "host"
 
 [[items]]
 section = "smtp"
 name = "local_hostname"
 
 [[items]]
 section = "smtp"
 name = "password"
 
 [[items]]
 section = "smtp"
 name = "port"
 default-type = "dynamic"
 
 [[items]]
 section = "smtp"
 name = "tls"
 default = "none"
 
 [[items]]
 section = "smtp"
 name = "username"
 
 [[items]]
 section = "sparse"
 name = "missingwarning"
 default = true
 experimental = true
 
 [[items]]
 section = "storage"
 name = "dirstate-v2.slow-path"
 default = "abort"
 experimental = true  # experimental as long as format.use-dirstate-v2 is.
 
 [[items]]
 section = "storage"
 name = "new-repo-backend"
 default = "revlogv1"
 experimental = true
 
 [[items]]
 section = "storage"
 name = "revlog.delta-parent-search.candidate-group-chunk-size"
 default = 20
 
 [[items]]
 section = "storage"
 name = "revlog.issue6528.fix-incoming"
 default = true
 
 [[items]]
 section = "storage"
 name = "revlog.optimize-delta-parent-choice"
 default = true
 alias = [["format", "aggressivemergedeltas"]]
 
 [[items]]
 section = "storage"
 name = "revlog.persistent-nodemap.mmap"
 default = true
 
 [[items]]
 section = "storage"
 name = "revlog.persistent-nodemap.slow-path"
 default = "abort"
 
 [[items]]
 section = "storage"
 name = "revlog.reuse-external-delta"
 default = true
 
 [[items]]
 section = "storage"
 name = "revlog.reuse-external-delta-parent"
 documentation = """This option is true unless `format.generaldelta` is set."""
 
 [[items]]
 section = "storage"
 name = "revlog.zlib.level"
 
 [[items]]
 section = "storage"
 name = "revlog.zstd.level"
 
 [[items]]
 section = "subrepos"
 name = "allowed"
 default-type = "dynamic"  # to make backporting simpler
 
 [[items]]
 section = "subrepos"
 name = "git:allowed"
 default-type = "dynamic"
 
 [[items]]
 section = "subrepos"
 name = "hg:allowed"
 default-type = "dynamic"
 
 [[items]]
 section = "subrepos"
 name = "svn:allowed"
 default-type = "dynamic"
 
 [[items]]
 section = "templateconfig"
 name = ".*"
 default-type = "dynamic"
 generic = true
 
 [[items]]
 section = "templates"
 name = ".*"
 generic = true
 
 [[items]]
 section = "trusted"
 name = "groups"
 default-type = "list_type"
 
 [[items]]
 section = "trusted"
 name = "users"
 default-type = "list_type"
 
 [[items]]
 section = "ui"
 name = "_usedassubrepo"
 default = false
 
 [[items]]
 section = "ui"
 name = "allowemptycommit"
 default = false
 
 [[items]]
 section = "ui"
 name = "archivemeta"
 default = true
 
 [[items]]
 section = "ui"
 name = "askusername"
 default = false
 
 [[items]]
 section = "ui"
 name = "available-memory"
 
 [[items]]
 section = "ui"
 name = "clonebundlefallback"
 default = false
 
 [[items]]
 section = "ui"
 name = "clonebundleprefers"
 default-type = "list_type"
 
 [[items]]
 section = "ui"
 name = "clonebundles"
 default = true
 
 [[items]]
 section = "ui"
 name = "color"
 default = "auto"
 
 [[items]]
 section = "ui"
 name = "commitsubrepos"
 default = false
 
 [[items]]
 section = "ui"
 name = "debug"
 default = false
 
 [[items]]
 section = "ui"
 name = "debugger"
 
 [[items]]
 section = "ui"
 name = "detailed-exit-code"
 default = false
 experimental = true
 
 [[items]]
 section = "ui"
 name = "editor"
 default-type = "dynamic"
 
 [[items]]
 section = "ui"
 name = "fallbackencoding"
 
 [[items]]
 section = "ui"
 name = "forcecwd"
 
 [[items]]
 section = "ui"
 name = "forcemerge"
 
 [[items]]
 section = "ui"
 name = "formatdebug"
 default = false
 
 [[items]]
 section = "ui"
 name = "formatjson"
 default = false
 
 [[items]]
 section = "ui"
 name = "formatted"
 
 [[items]]
 section = "ui"
 name = "interactive"
 
 [[items]]
 section = "ui"
 name = "interface"
 
 [[items]]
 section = "ui"
 name = "interface.chunkselector"
 
 [[items]]
 section = "ui"
 name = "large-file-limit"
 default = 10485760
 
 [[items]]
 section = "ui"
 name = "logblockedtimes"
 default = false
 
 [[items]]
 section = "ui"
 name = "merge"
 
 [[items]]
 section = "ui"
 name = "mergemarkers"
 default = "basic"
 
 [[items]]
 section = "ui"
 name = "message-output"
 default = "stdio"
 
 [[items]]
 section = "ui"
 name = "nontty"
 default = false
 
 [[items]]
 section = "ui"
 name = "origbackuppath"
 
 [[items]]
 section = "ui"
 name = "paginate"
 default = true
 
 [[items]]
 section = "ui"
 name = "patch"
 
 [[items]]
 section = "ui"
 name = "portablefilenames"
 default = "warn"
 
 [[items]]
 section = "ui"
 name = "promptecho"
 default = false
 
 [[items]]
 section = "ui"
 name = "quiet"
 default = false
 
 [[items]]
 section = "ui"
 name = "quietbookmarkmove"
 default = false
 
 [[items]]
 section = "ui"
 name = "relative-paths"
 default = "legacy"
 
 [[items]]
 section = "ui"
 name = "remotecmd"
 default = "hg"
 
 [[items]]
 section = "ui"
 name = "report_untrusted"
 default = true
 
 [[items]]
 section = "ui"
 name = "rollback"
 default = true
 
 [[items]]
 section = "ui"
 name = "signal-safe-lock"
 default = true
 
 [[items]]
 section = "ui"
 name = "slash"
 default = false
 
 [[items]]
 section = "ui"
 name = "ssh"
 default = "ssh"
 
 [[items]]
 section = "ui"
 name = "ssherrorhint"
 
 [[items]]
 section = "ui"
 name = "statuscopies"
 default = false
 
 [[items]]
 section = "ui"
 name = "strict"
 default = false
 
 [[items]]
 section = "ui"
 name = "style"
 default = ""
 
 [[items]]
 section = "ui"
 name = "supportcontact"
 
 [[items]]
 section = "ui"
 name = "textwidth"
 default = 78
 
 [[items]]
 section = "ui"
 name = "timeout"
 default = "600"
 
 [[items]]
 section = "ui"
 name = "timeout.warn"
 default = 0
 
 [[items]]
 section = "ui"
 name = "timestamp-output"
 default = false
 
 [[items]]
 section = "ui"
 name = "traceback"
 default = false
 
 [[items]]
 section = "ui"
 name = "tweakdefaults"
 default = false
 
 [[items]]
 section = "ui"
 name = "username"
 alias = [["ui", "user"]]
 
 [[items]]
 section = "ui"
 name = "verbose"
 default = false
 
 [[items]]
 section = "usage"
 name = "repository-role"
 default = "default"
 documentation = """What this repository is used for.
 
 This is used to adjust behavior and performance to best fit the repository purpose.
 
 Currently recognised values are:
 - default: an all purpose repository
 """
 
 [[items]]
+section = "usage"
+name = "resources"
+default = "default"
+documentation = """How aggressive Mercurial can be with resource usage:
+
+Currently recognised values are:
+- default: the default value currently is equivalent to medium,
+- high:    allows for higher cpu, memory and disk-space usage to improve the performance of some operations.
+- medium:  aims at a moderate resource usage,
+- low:     reduces resources usage when possible, decreasing overall performance.
+
+For finer configuration, see also `usage.resources.cpu`,
+`usage.resources.disk` and `usage.resources.memory`.
+"""
+
+[[items]]
+section = "usage"
+name = "resources.cpu"
+default = "default"
+documentation = """How aggressive Mercurial can be in terms of cpu usage:
+
+Currently recognised values are:
+- default: the default value, inherits the value from `usage.resources`,
+- high:    allows for more aggressive cpu usage, improving storage quality and
+           the performance of some operations at the expense of machine load
+- medium:  aims at a moderate cpu usage,
+- low:     reduces cpu usage when possible, potentially at the expense of
+           slower operations, increased storage and exchange payload.
+
+"""
+
+[[items]]
+section = "usage"
+name = "resources.disk"
+default = "default"
+documentation = """How aggressive Mercurial can be in terms of disk usage:
+
+Currently recognised values are:
+- default: the default value, inherits the value from `usage.resources`,
+- high:    allows for more disk space usage where it can improve the performance,
+- medium:  aims at a moderate disk usage,
+- low:     reduces disk usage when possible, decreasing performance in some occasion.
+"""
+
+[[items]]
+section = "usage"
+name = "resources.memory"
+default = "default"
+documentation = """How aggressive Mercurial can be in terms of memory usage:
+
+Currently recognised values are:
+- default: the default value, inherits the value from `usage.resources`,
+- high:    allows for more aggressive memory usage to improve overall performance,
+- medium:  aims at a moderate memory usage,
+- low:     reduces memory usage when possible at the cost of overall performance.
+"""
+
+[[items]]
 section = "verify"
 name = "skipflags"
 default = 0
 
 [[items]]
 section = "web"
 name = "accesslog"
 default = "-"
 
 [[items]]
 section = "web"
 name = "address"
 default = ""
 
 [[items]]
 section = "web"
 name = "allow-archive"
 default-type = "list_type"
 alias = [["web", "allow_archive"]]
 
 [[items]]
 section = "web"
 name = "allow-pull"
 default = true
 alias = [["web", "allowpull"]]
 
 [[items]]
 section = "web"
 name = "allow-push"
 default-type = "list_type"
 alias = [["web", "allow_push"]]
 
 [[items]]
 section = "web"
 name = "allow_read"
 default-type = "list_type"
 
 [[items]]
 section = "web"
 name = "allowbz2"
 default = false
 
 [[items]]
 section = "web"
 name = "allowgz"
 default = false
 
 [[items]]
 section = "web"
 name = "allowzip"
 default = false
 
 [[items]]
 section = "web"
 name = "archivesubrepos"
 default = false
 
 [[items]]
 section = "web"
 name = "baseurl"
 
 [[items]]
 section = "web"
 name = "cacerts"
 
 [[items]]
 section = "web"
 name = "cache"
 default = true
 
 [[items]]
 section = "web"
 name = "certificate"
 
 [[items]]
 section = "web"
 name = "collapse"
 default = false
 
 [[items]]
 section = "web"
 name = "comparisoncontext"
 default = 5
 
 [[items]]
 section = "web"
 name = "contact"
 
 [[items]]
 section = "web"
 name = "csp"
 
 [[items]]
 section = "web"
 name = "deny_push"
 default-type = "list_type"
 
 [[items]]
 section = "web"
 name = "deny_read"
 default-type = "list_type"
 
 [[items]]
 section = "web"
 name = "descend"
 default = true
 
 [[items]]
 section = "web"
 name = "description"
 default = ""
 
 [[items]]
 section = "web"
 name = "encoding"
 default-type = "lazy_module"
 default = "encoding.encoding"
 
 [[items]]
 section = "web"
 name = "errorlog"
 default = "-"
 
 [[items]]
 section = "web"
 name = "guessmime"
 default = false
 
 [[items]]
 section = "web"
 name = "hidden"
 default = false
 
 [[items]]
 section = "web"
 name = "ipv6"
 default = false
 
 [[items]]
 section = "web"
 name = "labels"
 default-type = "list_type"
 
 [[items]]
 section = "web"
 name = "logoimg"
 default = "hglogo.png"
 
 [[items]]
 section = "web"
 name = "logourl"
 default = "https://mercurial-scm.org/"
 
 [[items]]
 section = "web"
 name = "maxchanges"
 default = 10
 
 [[items]]
 section = "web"
 name = "maxfiles"
 default = 10
 
 [[items]]
 section = "web"
 name = "maxshortchanges"
 default = 60
 
 [[items]]
 section = "web"
 name = "motd"
 default = ""
 
 [[items]]
 section = "web"
 name = "name"
 default-type = "dynamic"
 
 [[items]]
 section = "web"
 name = "port"
 default = 8000
 
 [[items]]
 section = "web"
 name = "prefix"
 default = ""
 
 [[items]]
 section = "web"
 name = "push_ssl"
 default = true
 
 [[items]]
 section = "web"
 name = "refreshinterval"
 default = 20
 
 [[items]]
 section = "web"
 name = "server-header"
 
 [[items]]
 section = "web"
 name = "static"
 
 [[items]]
 section = "web"
 name = "staticurl"
 
 [[items]]
 section = "web"
 name = "stripes"
 default = 1
 
 [[items]]
 section = "web"
 name = "style"
 default = "paper"
 
 [[items]]
 section = "web"
 name = "templates"
 
 [[items]]
 section = "web"
 name = "view"
 default = "served"
 experimental = true
 
 [[items]]
 section = "worker"
 name = "backgroundclose"
 default-type = "dynamic"
 
 [[items]]
 section = "worker"
 name = "backgroundclosemaxqueue"
 # Windows defaults to a limit of 512 open files. A buffer of 128
 # should give us enough headway.
 default = 384
 
 [[items]]
 section = "worker"
 name = "backgroundcloseminfilecount"
 default = 2048
 
 [[items]]
 section = "worker"
 name = "backgroundclosethreadcount"
 default = 4
 
 [[items]]
 section = "worker"
 name = "enabled"
 default = true
 
 [[items]]
 section = "worker"
 name = "numcpus"
 
 # Templates and template applications
 
 [[template-applications]]
 template = "diff-options"
 section = "annotate"
 
 [[template-applications]]
 template = "diff-options"
 section = "commands"
 prefix = "commit.interactive"
 
 [[template-applications]]
 template = "diff-options"
 section = "commands"
 prefix = "revert.interactive"
 
 [[template-applications]]
 template = "diff-options"
 section = "diff"
 
 [templates]
 [[templates.diff-options]]
 suffix = "nodates"
 default = false
 
 [[templates.diff-options]]
 suffix = "showfunc"
 default = false
 
 [[templates.diff-options]]
 suffix = "unified"
 
 [[templates.diff-options]]
 suffix = "git"
 default = false
 
 [[templates.diff-options]]
 suffix = "ignorews"
 default = false
 
 [[templates.diff-options]]
 suffix = "ignorewsamount"
 default = false
 
 [[templates.diff-options]]
 suffix = "ignoreblanklines"
 default = false
 
 [[templates.diff-options]]
 suffix = "ignorewseol"
 default = false
 
 [[templates.diff-options]]
 suffix = "nobinary"
 default = false
 
 [[templates.diff-options]]
 suffix = "noprefix"
 default = false
 
 [[templates.diff-options]]
 suffix = "word-diff"
 default = false
 
 # In-core extensions
 
 [[items]]
 section = "blackbox"
 name = "debug.to-stderr"
 default = false
 in_core_extension = "blackbox"
 
 [[items]]
 section = "blackbox"
 name = "dirty"
 default = false
 in_core_extension = "blackbox"
 
 [[items]]
 section = "blackbox"
 name = "maxsize"
 default = "1 MB"
 in_core_extension = "blackbox"
 
 [[items]]
 section = "blackbox"
 name = "logsource"
 default = false
 in_core_extension = "blackbox"
 
 [[items]]
 section = "blackbox"
 name = "maxfiles"
 default = 7
 in_core_extension = "blackbox"
 
 [[items]]
 section = "blackbox"
 name = "track"
 default-type = "lambda"
 default = ["*"]
 in_core_extension = "blackbox"
 
 [[items]]
 section = "blackbox"
 name = "ignore"
 default-type = "lambda"
 default = ["chgserver", "cmdserver", "extension"]
 in_core_extension = "blackbox"
 
 [[items]]
 section = "blackbox"
 name = "date-format"
 default = ""
 in_core_extension = "blackbox"

mercurial/helptext/config.txt

@@ -1,3401 +1,3447 b''
 The Mercurial system uses a set of configuration files to control
 aspects of its behavior.
 
 Troubleshooting
 ===============
 
 If you're having problems with your configuration,
 :hg:`config --source` can help you understand what is introducing
 a setting into your environment.
 
 See :hg:`help config.syntax` and :hg:`help config.files`
 for information about how and where to override things.
 
 Structure
 =========
 
 The configuration files use a simple ini-file format. A configuration
 file consists of sections, led by a ``[section]`` header and followed
 by ``name = value`` entries::
 
   [ui]
   username = Firstname Lastname <[e-mail]>
   verbose = True
 
 The above entries will be referred to as ``ui.username`` and
 ``ui.verbose``, respectively. See :hg:`help config.syntax`.
 
 Files
 =====
 
 Mercurial reads configuration data from several files, if they exist.
 These files do not exist by default and you will have to create the
 appropriate configuration files yourself:
 
 Local configuration is put into the per-repository ``<repo>/.hg/hgrc`` file.
 
 Global configuration like the username setting is typically put into:
 
 .. container:: windows
 
   - ``%USERPROFILE%\mercurial.ini`` (on Windows)
 
 .. container:: unix.plan9
 
   - ``$HOME/.hgrc`` (on Unix, Plan9)
 
 The names of these files depend on the system on which Mercurial is
 installed. ``*.rc`` files from a single directory are read in
 alphabetical order, later ones overriding earlier ones. Where multiple
 paths are given below, settings from earlier paths override later
 ones.
 
 .. container:: verbose.unix
 
   On Unix, the following files are consulted:
 
   - ``<repo>/.hg/hgrc-not-shared`` (per-repository)
   - ``<repo>/.hg/hgrc`` (per-repository)
   - ``$HOME/.hgrc`` (per-user)
   - ``${XDG_CONFIG_HOME:-$HOME/.config}/hg/hgrc`` (per-user)
   - ``<install-root>/etc/mercurial/hgrc`` (per-installation)
   - ``<install-root>/etc/mercurial/hgrc.d/*.rc`` (per-installation)
   - ``/etc/mercurial/hgrc`` (per-system)
   - ``/etc/mercurial/hgrc.d/*.rc`` (per-system)
   - ``<internal>/*.rc`` (defaults)
 
 .. container:: verbose.windows
 
   On Windows, the following files are consulted:
 
   - ``<repo>/.hg/hgrc-not-shared`` (per-repository)
   - ``<repo>/.hg/hgrc`` (per-repository)
   - ``%USERPROFILE%\.hgrc`` (per-user)
   - ``%USERPROFILE%\Mercurial.ini`` (per-user)
   - ``%HOME%\.hgrc`` (per-user)
   - ``%HOME%\Mercurial.ini`` (per-user)
   - ``HKEY_LOCAL_MACHINE\SOFTWARE\Mercurial`` (per-system)
   - ``<install-dir>\hgrc.d\*.rc`` (per-installation)
   - ``<install-dir>\Mercurial.ini`` (per-installation)
   - ``%PROGRAMDATA%\Mercurial\hgrc`` (per-system)
   - ``%PROGRAMDATA%\Mercurial\Mercurial.ini`` (per-system)
   - ``%PROGRAMDATA%\Mercurial\hgrc.d\*.rc`` (per-system)
   - ``<internal>/*.rc`` (defaults)
 
   .. note::
 
    The registry key ``HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Mercurial``
    is used when running 32-bit Python on 64-bit Windows.
 
 .. container:: verbose.plan9
 
   On Plan9, the following files are consulted:
 
   - ``<repo>/.hg/hgrc-not-shared`` (per-repository)
   - ``<repo>/.hg/hgrc`` (per-repository)
   - ``$home/lib/hgrc`` (per-user)
   - ``<install-root>/lib/mercurial/hgrc`` (per-installation)
   - ``<install-root>/lib/mercurial/hgrc.d/*.rc`` (per-installation)
   - ``/lib/mercurial/hgrc`` (per-system)
   - ``/lib/mercurial/hgrc.d/*.rc`` (per-system)
   - ``<internal>/*.rc`` (defaults)
 
 Per-repository configuration options only apply in a
 particular repository. This file is not version-controlled, and
 will not get transferred during a "clone" operation. Options in
 this file override options in all other configuration files.
 
 .. container:: unix.plan9
 
   On Plan 9 and Unix, most of this file will be ignored if it doesn't
   belong to a trusted user or to a trusted group. See
   :hg:`help config.trusted` for more details.
 
 Per-user configuration file(s) are for the user running Mercurial.  Options
 in these files apply to all Mercurial commands executed by this user in any
 directory. Options in these files override per-system and per-installation
 options.
 
 Per-installation configuration files are searched for in the
 directory where Mercurial is installed. ``<install-root>`` is the
 parent directory of the **hg** executable (or symlink) being run.
 
 .. container:: unix.plan9
 
   For example, if installed in ``/shared/tools/bin/hg``, Mercurial
   will look in ``/shared/tools/etc/mercurial/hgrc``. Options in these
   files apply to all Mercurial commands executed by any user in any
   directory.
 
 Per-installation configuration files are for the system on
 which Mercurial is running. Options in these files apply to all
 Mercurial commands executed by any user in any directory. Registry
 keys contain PATH-like strings, every part of which must reference
 a ``Mercurial.ini`` file or be a directory where ``*.rc`` files will
 be read.  Mercurial checks each of these locations in the specified
 order until one or more configuration files are detected.
 
 Per-system configuration files are for the system on which Mercurial
 is running. Options in these files apply to all Mercurial commands
 executed by any user in any directory. Options in these files
 override per-installation options.
 
 Mercurial comes with some default configuration. The default configuration
 files are installed with Mercurial and will be overwritten on upgrades. Default
 configuration files should never be edited by users or administrators but can
 be overridden in other configuration files. So far the directory only contains
 merge tool configuration but packagers can also put other default configuration
 there.
 
 On versions 5.7 and later, if share-safe functionality is enabled,
 shares will read config file of share source too.
 `<share-source/.hg/hgrc>` is read before reading `<repo/.hg/hgrc>`.
 
 For configs which should not be shared, `<repo/.hg/hgrc-not-shared>`
 should be used.
 
 Syntax
 ======
 
 A configuration file consists of sections, led by a ``[section]`` header
 and followed by ``name = value`` entries (sometimes called
 ``configuration keys``)::
 
     [spam]
     eggs=ham
     green=
        eggs
 
 Each line contains one entry. If the lines that follow are indented,
 they are treated as continuations of that entry. Leading whitespace is
 removed from values. Empty lines are skipped. Lines beginning with
 ``#`` or ``;`` are ignored and may be used to provide comments.
 
 Configuration keys can be set multiple times, in which case Mercurial
 will use the value that was configured last. As an example::
 
     [spam]
     eggs=large
     ham=serrano
     eggs=small
 
 This would set the configuration key named ``eggs`` to ``small``.
 
 It is also possible to define a section multiple times. A section can
 be redefined on the same and/or on different configuration files. For
 example::
 
     [foo]
     eggs=large
     ham=serrano
     eggs=small
 
     [bar]
     eggs=ham
     green=
        eggs
 
     [foo]
     ham=prosciutto
     eggs=medium
     bread=toasted
 
 This would set the ``eggs``, ``ham``, and ``bread`` configuration keys
 of the ``foo`` section to ``medium``, ``prosciutto``, and ``toasted``,
 respectively. As you can see there only thing that matters is the last
 value that was set for each of the configuration keys.
 
 If a configuration key is set multiple times in different
 configuration files the final value will depend on the order in which
 the different configuration files are read, with settings from earlier
 paths overriding later ones as described on the ``Files`` section
 above.
 
 A line of the form ``%include file`` will include ``file`` into the
 current configuration file. The inclusion is recursive, which means
 that included files can include other files. Filenames are relative to
 the configuration file in which the ``%include`` directive is found.
 Environment variables and ``~user`` constructs are expanded in
 ``file``. This lets you do something like::
 
   %include ~/.hgrc.d/$HOST.rc
 
 to include a different configuration file on each computer you use.
 
 A line with ``%unset name`` will remove ``name`` from the current
 section, if it has been set previously.
 
 The values are either free-form text strings, lists of text strings,
 or Boolean values. Boolean values can be set to true using any of "1",
 "yes", "true", or "on" and to false using "0", "no", "false", or "off"
 (all case insensitive).
 
 List values are separated by whitespace or comma, except when values are
 placed in double quotation marks::
 
   allow_read = "John Doe, PhD", brian, betty
 
 Quotation marks can be escaped by prefixing them with a backslash. Only
 quotation marks at the beginning of a word is counted as a quotation
 (e.g., ``foo"bar baz`` is the list of ``foo"bar`` and ``baz``).
 
 Sections
 ========
 
 This section describes the different sections that may appear in a
 Mercurial configuration file, the purpose of each section, its possible
 keys, and their possible values.
 
 ``alias``
 ---------
 
 Defines command aliases.
 
 Aliases allow you to define your own commands in terms of other
 commands (or aliases), optionally including arguments. Positional
 arguments in the form of ``$1``, ``$2``, etc. in the alias definition
 are expanded by Mercurial before execution. Positional arguments not
 already used by ``$N`` in the definition are put at the end of the
 command to be executed.
 
 Alias definitions consist of lines of the form::
 
     <alias> = <command> [<argument>]...
 
 For example, this definition::
 
     latest = log --limit 5
 
 creates a new command ``latest`` that shows only the five most recent
 changesets. You can define subsequent aliases using earlier ones::
 
     stable5 = latest -b stable
 
 .. note::
 
    It is possible to create aliases with the same names as
    existing commands, which will then override the original
    definitions. This is almost always a bad idea!
 
 An alias can start with an exclamation point (``!``) to make it a
 shell alias. A shell alias is executed with the shell and will let you
 run arbitrary commands. As an example, ::
 
    echo = !echo $@
 
 will let you do ``hg echo foo`` to have ``foo`` printed in your
 terminal. A better example might be::
 
    purge = !$HG status --no-status --unknown -0 re: | xargs -0 rm -f
 
 which will make ``hg purge`` delete all unknown files in the
 repository in the same manner as the purge extension.
 
 Positional arguments like ``$1``, ``$2``, etc. in the alias definition
 expand to the command arguments. Unmatched arguments are
 removed. ``$0`` expands to the alias name and ``$@`` expands to all
 arguments separated by a space. ``"$@"`` (with quotes) expands to all
 arguments quoted individually and separated by a space. These expansions
 happen before the command is passed to the shell.
 
 Shell aliases are executed in an environment where ``$HG`` expands to
 the path of the Mercurial that was used to execute the alias. This is
 useful when you want to call further Mercurial commands in a shell
 alias, as was done above for the purge alias. In addition,
 ``$HG_ARGS`` expands to the arguments given to Mercurial. In the ``hg
 echo foo`` call above, ``$HG_ARGS`` would expand to ``echo foo``.
 
 .. note::
 
    Some global configuration options such as ``-R`` are
    processed before shell aliases and will thus not be passed to
    aliases.
 
 
 ``annotate``
 ------------
 
 Settings used when displaying file annotations. All values are
 Booleans and default to False. See :hg:`help config.diff` for
 related options for the diff command.
 
 ``ignorews``
     Ignore white space when comparing lines.
 
 ``ignorewseol``
     Ignore white space at the end of a line when comparing lines.
 
 ``ignorewsamount``
     Ignore changes in the amount of white space.
 
 ``ignoreblanklines``
     Ignore changes whose lines are all blank.
 
 
 ``auth``
 --------
 
 Authentication credentials and other authentication-like configuration
 for HTTP connections. This section allows you to store usernames and
 passwords for use when logging *into* HTTP servers. See
 :hg:`help config.web` if you want to configure *who* can login to
 your HTTP server.
 
 The following options apply to all hosts.
 
 ``cookiefile``
     Path to a file containing HTTP cookie lines. Cookies matching a
     host will be sent automatically.
 
     The file format uses the Mozilla cookies.txt format, which defines cookies
     on their own lines. Each line contains 7 fields delimited by the tab
     character (domain, is_domain_cookie, path, is_secure, expires, name,
     value). For more info, do an Internet search for "Netscape cookies.txt
     format."
 
     Note: the cookies parser does not handle port numbers on domains. You
     will need to remove ports from the domain for the cookie to be recognized.
     This could result in a cookie being disclosed to an unwanted server.
 
     The cookies file is read-only.
 
 Other options in this section are grouped by name and have the following
 format::
 
     <name>.<argument> = <value>
 
 where ``<name>`` is used to group arguments into authentication
 entries. Example::
 
     foo.prefix = hg.intevation.de/mercurial
     foo.username = foo
     foo.password = bar
     foo.schemes = http https
 
     bar.prefix = secure.example.org
     bar.key = path/to/file.key
     bar.cert = path/to/file.cert
     bar.schemes = https
 
 Supported arguments:
 
 ``prefix``
     Either ``*`` or a URI prefix with or without the scheme part.
     The authentication entry with the longest matching prefix is used
     (where ``*`` matches everything and counts as a match of length
     1). If the prefix doesn't include a scheme, the match is performed
     against the URI with its scheme stripped as well, and the schemes
     argument, q.v., is then subsequently consulted.
 
 ``username``
     Optional. Username to authenticate with. If not given, and the
     remote site requires basic or digest authentication, the user will
     be prompted for it. Environment variables are expanded in the
     username letting you do ``foo.username = $USER``. If the URI
     includes a username, only ``[auth]`` entries with a matching
     username or without a username will be considered.
 
 ``password``
     Optional. Password to authenticate with. If not given, and the
     remote site requires basic or digest authentication, the user
     will be prompted for it.
 
 ``key``
     Optional. PEM encoded client certificate key file. Environment
     variables are expanded in the filename.
 
 ``cert``
     Optional. PEM encoded client certificate chain file. Environment
     variables are expanded in the filename.
 
 ``schemes``
     Optional. Space separated list of URI schemes to use this
     authentication entry with. Only used if the prefix doesn't include
     a scheme. Supported schemes are http and https. They will match
     static-http and static-https respectively, as well.
     (default: https)
 
 If no suitable authentication entry is found, the user is prompted
 for credentials as usual if required by the remote.
 
 ``cmdserver``
 -------------
 
 Controls command server settings. (ADVANCED)
 
 ``message-encodings``
     List of encodings for the ``m`` (message) channel. The first encoding
     supported by the server will be selected and advertised in the hello
     message. This is useful only when ``ui.message-output`` is set to
     ``channel``. Supported encodings are ``cbor``.
 
 ``shutdown-on-interrupt``
     If set to false, the server's main loop will continue running after
     SIGINT received. ``runcommand`` requests can still be interrupted by
     SIGINT. Close the write end of the pipe to shut down the server
     process gracefully.
     (default: True)
 
 ``color``
 ---------
 
 Configure the Mercurial color mode. For details about how to define your custom
 effect and style see :hg:`help color`.
 
 ``mode``
     String: control the method used to output color. One of ``auto``, ``ansi``,
     ``win32``, ``terminfo`` or ``debug``. In auto mode, Mercurial will
     use ANSI mode by default (or win32 mode prior to Windows 10) if it detects a
     terminal. Any invalid value will disable color.
 
 ``pagermode``
     String: optional override of ``color.mode`` used with pager.
 
     On some systems, terminfo mode may cause problems when using
     color with ``less -R`` as a pager program. less with the -R option
     will only display ECMA-48 color codes, and terminfo mode may sometimes
     emit codes that less doesn't understand. You can work around this by
     either using ansi mode (or auto mode), or by using less -r (which will
     pass through all terminal control codes, not just color control
     codes).
 
     On some systems (such as MSYS in Windows), the terminal may support
     a different color mode than the pager program.
 
 ``commands``
 ------------
 
 ``commit.post-status``
     Show status of files in the working directory after successful commit.
     (default: False)
 
 ``merge.require-rev``
     Require that the revision to merge the current commit with be specified on
     the command line. If this is enabled and a revision is not specified, the
     command aborts.
     (default: False)
 
 ``push.require-revs``
     Require revisions to push be specified using one or more mechanisms such as
     specifying them positionally on the command line, using ``-r``, ``-b``,
     and/or ``-B`` on the command line, or using ``paths.<path>:pushrev`` in the
     configuration. If this is enabled and revisions are not specified, the
     command aborts.
     (default: False)
 
 ``resolve.confirm``
     Confirm before performing action if no filename is passed.
     (default: False)
 
 ``resolve.explicit-re-merge``
     Require uses of ``hg resolve`` to specify which action it should perform,
     instead of re-merging files by default.
     (default: False)
 
 ``resolve.mark-check``
     Determines what level of checking :hg:`resolve --mark` will perform before
     marking files as resolved. Valid values are ``none`, ``warn``, and
     ``abort``. ``warn`` will output a warning listing the file(s) that still
     have conflict markers in them, but will still mark everything resolved.
     ``abort`` will output the same warning but will not mark things as resolved.
     If --all is passed and this is set to ``abort``, only a warning will be
     shown (an error will not be raised).
     (default: ``none``)
 
 ``status.relative``
     Make paths in :hg:`status` output relative to the current directory.
     (default: False)
 
 ``status.terse``
     Default value for the --terse flag, which condenses status output.
     (default: empty)
 
 ``update.check``
     Determines what level of checking :hg:`update` will perform before moving
     to a destination revision. Valid values are ``abort``, ``none``,
     ``linear``, and ``noconflict``.
 
     - ``abort`` always fails if the working directory has uncommitted changes.
 
     - ``none`` performs no checking, and may result in a merge with uncommitted changes.
 
     - ``linear`` allows any update as long as it follows a straight line in the
       revision history, and may trigger a merge with uncommitted changes.
 
     - ``noconflict`` will allow any update which would not trigger a merge with
       uncommitted changes, if any are present.
 
     (default: ``linear``)
 
 ``update.requiredest``
     Require that the user pass a destination when running :hg:`update`.
     For example, :hg:`update .::` will be allowed, but a plain :hg:`update`
     will be disallowed.
     (default: False)
 
 ``committemplate``
 ------------------
 
 ``changeset``
     String: configuration in this section is used as the template to
     customize the text shown in the editor when committing.
 
 In addition to pre-defined template keywords, commit log specific one
 below can be used for customization:
 
 ``extramsg``
     String: Extra message (typically 'Leave message empty to abort
     commit.'). This may be changed by some commands or extensions.
 
 For example, the template configuration below shows as same text as
 one shown by default::
 
     [committemplate]
     changeset = {desc}\n\n
         HG: Enter commit message.  Lines beginning with 'HG:' are removed.
         HG: {extramsg}
         HG: --
         HG: user: {author}\n{ifeq(p2rev, "-1", "",
        "HG: branch merge\n")
        }HG: branch '{branch}'\n{if(activebookmark,
        "HG: bookmark '{activebookmark}'\n")   }{subrepos %
        "HG: subrepo {subrepo}\n"              }{file_adds %
        "HG: added {file}\n"                   }{file_mods %
        "HG: changed {file}\n"                 }{file_dels %
        "HG: removed {file}\n"                 }{if(files, "",
        "HG: no files changed\n")}
 
 ``diff()``
     String: show the diff (see :hg:`help templates` for detail)
 
 Sometimes it is helpful to show the diff of the changeset in the editor without
 having to prefix 'HG: ' to each line so that highlighting works correctly. For
 this, Mercurial provides a special string which will ignore everything below
 it::
 
      HG: ------------------------ >8 ------------------------
 
 For example, the template configuration below will show the diff below the
 extra message::
 
     [committemplate]
     changeset = {desc}\n\n
         HG: Enter commit message.  Lines beginning with 'HG:' are removed.
         HG: {extramsg}
         HG: ------------------------ >8 ------------------------
         HG: Do not touch the line above.
         HG: Everything below will be removed.
         {diff()}
 
 .. note::
 
    For some problematic encodings (see :hg:`help win32mbcs` for
    detail), this customization should be configured carefully, to
    avoid showing broken characters.
 
    For example, if a multibyte character ending with backslash (0x5c) is
    followed by the ASCII character 'n' in the customized template,
    the sequence of backslash and 'n' is treated as line-feed unexpectedly
    (and the multibyte character is broken, too).
 
 Customized template is used for commands below (``--edit`` may be
 required):
 
 - :hg:`backout`
 - :hg:`commit`
 - :hg:`fetch` (for merge commit only)
 - :hg:`graft`
 - :hg:`histedit`
 - :hg:`import`
 - :hg:`qfold`, :hg:`qnew` and :hg:`qrefresh`
 - :hg:`rebase`
 - :hg:`shelve`
 - :hg:`sign`
 - :hg:`tag`
 - :hg:`transplant`
 
 Configuring items below instead of ``changeset`` allows showing
 customized message only for specific actions, or showing different
 messages for each action.
 
 - ``changeset.backout`` for :hg:`backout`
 - ``changeset.commit.amend.merge`` for :hg:`commit --amend` on merges
 - ``changeset.commit.amend.normal`` for :hg:`commit --amend` on other
 - ``changeset.commit.normal.merge`` for :hg:`commit` on merges
 - ``changeset.commit.normal.normal`` for :hg:`commit` on other
 - ``changeset.fetch`` for :hg:`fetch` (impling merge commit)
 - ``changeset.gpg.sign`` for :hg:`sign`
 - ``changeset.graft`` for :hg:`graft`
 - ``changeset.histedit.edit`` for ``edit`` of :hg:`histedit`
 - ``changeset.histedit.fold`` for ``fold`` of :hg:`histedit`
 - ``changeset.histedit.mess`` for ``mess`` of :hg:`histedit`
 - ``changeset.histedit.pick`` for ``pick`` of :hg:`histedit`
 - ``changeset.import.bypass`` for :hg:`import --bypass`
 - ``changeset.import.normal.merge`` for :hg:`import` on merges
 - ``changeset.import.normal.normal`` for :hg:`import` on other
 - ``changeset.mq.qnew`` for :hg:`qnew`
 - ``changeset.mq.qfold`` for :hg:`qfold`
 - ``changeset.mq.qrefresh`` for :hg:`qrefresh`
 - ``changeset.rebase.collapse`` for :hg:`rebase --collapse`
 - ``changeset.rebase.merge`` for :hg:`rebase` on merges
 - ``changeset.rebase.normal`` for :hg:`rebase` on other
 - ``changeset.shelve.shelve`` for :hg:`shelve`
 - ``changeset.tag.add`` for :hg:`tag` without ``--remove``
 - ``changeset.tag.remove`` for :hg:`tag --remove`
 - ``changeset.transplant.merge`` for :hg:`transplant` on merges
 - ``changeset.transplant.normal`` for :hg:`transplant` on other
 
 These dot-separated lists of names are treated as hierarchical ones.
 For example, ``changeset.tag.remove`` customizes the commit message
 only for :hg:`tag --remove`, but ``changeset.tag`` customizes the
 commit message for :hg:`tag` regardless of ``--remove`` option.
 
 When the external editor is invoked for a commit, the corresponding
 dot-separated list of names without the ``changeset.`` prefix
 (e.g. ``commit.normal.normal``) is in the ``HGEDITFORM`` environment
 variable.
 
 In this section, items other than ``changeset`` can be referred from
 others. For example, the configuration to list committed files up
 below can be referred as ``{listupfiles}``::
 
     [committemplate]
     listupfiles = {file_adds %
        "HG: added {file}\n"     }{file_mods %
        "HG: changed {file}\n"   }{file_dels %
        "HG: removed {file}\n"   }{if(files, "",
        "HG: no files changed\n")}
 
 ``decode/encode``
 -----------------
 
 Filters for transforming files on checkout/checkin. This would
 typically be used for newline processing or other
 localization/canonicalization of files.
 
 Filters consist of a filter pattern followed by a filter command.
 Filter patterns are globs by default, rooted at the repository root.
 For example, to match any file ending in ``.txt`` in the root
 directory only, use the pattern ``*.txt``. To match any file ending
 in ``.c`` anywhere in the repository, use the pattern ``**.c``.
 For each file only the first matching filter applies.
 
 The filter command can start with a specifier, either ``pipe:`` or
 ``tempfile:``. If no specifier is given, ``pipe:`` is used by default.
 
 A ``pipe:`` command must accept data on stdin and return the transformed
 data on stdout.
 
 Pipe example::
 
   [encode]
   # uncompress gzip files on checkin to improve delta compression
   # note: not necessarily a good idea, just an example
   *.gz = pipe: gunzip
 
   [decode]
   # recompress gzip files when writing them to the working dir (we
   # can safely omit "pipe:", because it's the default)
   *.gz = gzip
 
 A ``tempfile:`` command is a template. The string ``INFILE`` is replaced
 with the name of a temporary file that contains the data to be
 filtered by the command. The string ``OUTFILE`` is replaced with the name
 of an empty temporary file, where the filtered data must be written by
 the command.
 
 .. container:: windows
 
    .. note::
 
      The tempfile mechanism is recommended for Windows systems,
      where the standard shell I/O redirection operators often have
      strange effects and may corrupt the contents of your files.
 
 This filter mechanism is used internally by the ``eol`` extension to
 translate line ending characters between Windows (CRLF) and Unix (LF)
 format. We suggest you use the ``eol`` extension for convenience.
 
 
 ``defaults``
 ------------
 
 (defaults are deprecated. Don't use them. Use aliases instead.)
 
 Use the ``[defaults]`` section to define command defaults, i.e. the
 default options/arguments to pass to the specified commands.
 
 The following example makes :hg:`log` run in verbose mode, and
 :hg:`status` show only the modified files, by default::
 
   [defaults]
   log = -v
   status = -m
 
 The actual commands, instead of their aliases, must be used when
 defining command defaults. The command defaults will also be applied
 to the aliases of the commands defined.
 
 
 ``diff``
 --------
 
 Settings used when displaying diffs. Everything except for ``unified``
 is a Boolean and defaults to False. See :hg:`help config.annotate`
 for related options for the annotate command.
 
 ``git``
     Use git extended diff format.
 
 ``nobinary``
     Omit git binary patches.
 
 ``nodates``
     Don't include dates in diff headers.
 
 ``noprefix``
     Omit 'a/' and 'b/' prefixes from filenames. Ignored in plain mode.
 
 ``showfunc``
     Show which function each change is in.
 
 ``ignorews``
     Ignore white space when comparing lines.
 
 ``ignorewsamount``
     Ignore changes in the amount of white space.
 
 ``ignoreblanklines``
     Ignore changes whose lines are all blank.
 
 ``unified``
     Number of lines of context to show.
 
 ``word-diff``
     Highlight changed words.
 
 ``email``
 ---------
 
 Settings for extensions that send email messages.
 
 ``from``
     Optional. Email address to use in "From" header and SMTP envelope
     of outgoing messages.
 
 ``to``
     Optional. Comma-separated list of recipients' email addresses.
 
 ``cc``
     Optional. Comma-separated list of carbon copy recipients'
     email addresses.
 
 ``bcc``
     Optional. Comma-separated list of blind carbon copy recipients'
     email addresses.
 
 ``method``
     Optional. Method to use to send email messages. If value is ``smtp``
     (default), use SMTP (see the ``[smtp]`` section for configuration).
     Otherwise, use as name of program to run that acts like sendmail
     (takes ``-f`` option for sender, list of recipients on command line,
     message on stdin). Normally, setting this to ``sendmail`` or
     ``/usr/sbin/sendmail`` is enough to use sendmail to send messages.
 
 ``charsets``
     Optional. Comma-separated list of character sets considered
     convenient for recipients. Addresses, headers, and parts not
     containing patches of outgoing messages will be encoded in the
     first character set to which conversion from local encoding
     (``$HGENCODING``, ``ui.fallbackencoding``) succeeds. If correct
     conversion fails, the text in question is sent as is.
     (default: '')
 
     Order of outgoing email character sets:
 
     1. ``us-ascii``: always first, regardless of settings
     2. ``email.charsets``: in order given by user
     3. ``ui.fallbackencoding``: if not in email.charsets
     4. ``$HGENCODING``: if not in email.charsets
     5. ``utf-8``: always last, regardless of settings
 
 Email example::
 
   [email]
   from = Joseph User <[e-mail]>
   method = /usr/sbin/sendmail
   # charsets for western Europeans
   # us-ascii, utf-8 omitted, as they are tried first and last
   charsets = iso-8859-1, iso-8859-15, windows-1252
 
 
 ``extensions``
 --------------
 
 Mercurial has an extension mechanism for adding new features. To
 enable an extension, create an entry for it in this section.
 
 If you know that the extension is already in Python's search path,
 you can give the name of the module, followed by ``=``, with nothing
 after the ``=``.
 
 Otherwise, give a name that you choose, followed by ``=``, followed by
 the path to the ``.py`` file (including the file name extension) that
 defines the extension.
 
 To explicitly disable an extension that is enabled in an hgrc of
 broader scope, prepend its path with ``!``, as in ``foo = !/ext/path``
 or ``foo = !`` when path is not supplied.
 
 Example for ``~/.hgrc``::
 
   [extensions]
   # (the churn extension will get loaded from Mercurial's path)
   churn =
   # (this extension will get loaded from the file specified)
   myfeature = ~/.hgext/myfeature.py
 
 If an extension fails to load, a warning will be issued, and Mercurial will
 proceed. To enforce that an extension must be loaded, one can set the `required`
 suboption in the config::
 
   [extensions]
   myfeature = ~/.hgext/myfeature.py
   myfeature:required = yes
 
 To debug extension loading issue, one can add `--traceback` to their mercurial
 invocation.
 
 A default setting can we set using the special `*` extension key::
 
   [extensions]
   *:required = yes
   myfeature = ~/.hgext/myfeature.py
   rebase=
 
 
 ``format``
 ----------
 
 Configuration that controls the repository format. Newer format options are more
 powerful, but incompatible with some older versions of Mercurial. Format options
 are considered at repository initialization only. You need to make a new clone
 for config changes to be taken into account.
 
 For more details about repository format and version compatibility, see
 https://www.mercurial-scm.org/wiki/MissingRequirement
 
 ``usegeneraldelta``
     Enable or disable the "generaldelta" repository format which improves
     repository compression by allowing "revlog" to store deltas against
     arbitrary revisions instead of the previously stored one. This provides
     significant improvement for repositories with branches.
 
     Repositories with this on-disk format require Mercurial version 1.9.
 
     Enabled by default.
 
 ``dotencode``
     Enable or disable the "dotencode" repository format which enhances
     the "fncache" repository format (which has to be enabled to use
     dotencode) to avoid issues with filenames starting with "._" on
     Mac OS X and spaces on Windows.
 
     Repositories with this on-disk format require Mercurial version 1.7.
 
     Enabled by default.
 
 ``usefncache``
     Enable or disable the "fncache" repository format which enhances
     the "store" repository format (which has to be enabled to use
     fncache) to allow longer filenames and avoids using Windows
     reserved names, e.g. "nul".
 
     Repositories with this on-disk format require Mercurial version 1.1.
 
     Enabled by default.
 
 ``use-dirstate-v2``
     Enable or disable the experimental "dirstate-v2" feature. The dirstate
     functionality is shared by all commands interacting with the working copy.
     The new version is more robust, faster and stores more information.
 
     The performance-improving version of this feature is currently only
     implemented in Rust (see :hg:`help rust`), so people not using a version of
     Mercurial compiled with the Rust parts might actually suffer some slowdown.
     For this reason, such versions will by default refuse to access repositories
     with "dirstate-v2" enabled.
 
     This behavior can be adjusted via configuration: check
     :hg:`help config.storage.dirstate-v2.slow-path` for details.
 
     Repositories with this on-disk format require Mercurial 6.0 or above.
 
     By default this format variant is disabled if the fast implementation is not
     available, and enabled by default if the fast implementation is available.
 
     To accomodate installations of Mercurial without the fast implementation,
     you can downgrade your repository. To do so run the following command:
 
     $ hg debugupgraderepo \
           --run \
           --config format.use-dirstate-v2=False \
           --config storage.dirstate-v2.slow-path=allow
 
     For a more comprehensive guide, see :hg:`help internals.dirstate-v2`.
 
 ``use-dirstate-v2.automatic-upgrade-of-mismatching-repositories``
    When enabled, an automatic upgrade will be triggered when a repository format
    does not match its `use-dirstate-v2` config.
 
    This is an advanced behavior that most users will not need. We recommend you
    don't use this unless you are a seasoned administrator of a Mercurial install
    base.
 
    Automatic upgrade means that any process accessing the repository will
    upgrade the repository format to use `dirstate-v2`. This only triggers if a
    change is needed. This also applies to operations that would have been
    read-only (like hg status).
 
    If the repository cannot be locked, the automatic-upgrade operation will be
    skipped. The next operation will attempt it again.
 
    This configuration will apply for moves in any direction, either adding the
    `dirstate-v2` format if `format.use-dirstate-v2=yes` or removing the
    `dirstate-v2` requirement if `format.use-dirstate-v2=no`. So we recommend
    setting both this value and `format.use-dirstate-v2` at the same time.
 
 ``use-dirstate-v2.automatic-upgrade-of-mismatching-repositories:quiet``
     Hide message when performing such automatic upgrade.
 
 ``use-dirstate-tracked-hint``
     Enable or disable the writing of "tracked key" file alongside the dirstate.
     (default to disabled)
 
     That "tracked-hint" can help external automations to detect changes to the
     set of tracked files. (i.e the result of `hg files` or `hg status -macd`)
 
     The tracked-hint is written in a new `.hg/dirstate-tracked-hint`. That file
     contains two lines:
     - the first line is the file version (currently: 1),
     - the second line contains the "tracked-hint".
     That file is written right after the dirstate is written.
 
     The tracked-hint changes whenever the set of file tracked in the dirstate
     changes. The general idea is:
     - if the hint is identical, the set of tracked file SHOULD be identical,
     - if the hint is different, the set of tracked file MIGHT be different.
 
     The "hint is identical" case uses `SHOULD` as the dirstate and the hint file
     are two distinct files and therefore that cannot be read or written to in an
     atomic way. If the key is identical, nothing garantees that the dirstate is
     not updated right after the hint file. This is considered a negligible
     limitation for the intended usecase. It is actually possible to prevent this
     race by taking the repository lock during read operations.
 
     They are two "ways" to use this feature:
 
     1) monitoring changes to the `.hg/dirstate-tracked-hint`, if the file
     changes, the tracked set might have changed.
 
     2) storing the value and comparing it to a later value.
 
 
 ``use-dirstate-tracked-hint.automatic-upgrade-of-mismatching-repositories``
    When enabled, an automatic upgrade will be triggered when a repository format
    does not match its `use-dirstate-tracked-hint` config.
 
    This is an advanced behavior that most users will not need. We recommend you
    don't use this unless you are a seasoned administrator of a Mercurial install
    base.
 
    Automatic upgrade means that any process accessing the repository will
    upgrade the repository format to use `dirstate-tracked-hint`. This only
    triggers if a change is needed. This also applies to operations that would
    have been read-only (like hg status).
 
    If the repository cannot be locked, the automatic-upgrade operation will be
    skipped. The next operation will attempt it again.
 
    This configuration will apply for moves in any direction, either adding the
    `dirstate-tracked-hint` format if `format.use-dirstate-tracked-hint=yes` or
    removing the `dirstate-tracked-hint` requirement if
    `format.use-dirstate-tracked-hint=no`. So we recommend setting both this
    value and `format.use-dirstate-tracked-hint` at the same time.
 
 
 ``use-dirstate-tracked-hint.automatic-upgrade-of-mismatching-repositories:quiet``
     Hide message when performing such automatic upgrade.
 
 
 ``use-persistent-nodemap``
     Enable or disable the "persistent-nodemap" feature which improves
     performance if the Rust extensions are available.
 
     The "persistent-nodemap" persist the "node -> rev" on disk removing the
     need to dynamically build that mapping for each Mercurial invocation. This
     significantly reduces the startup cost of various local and server-side
     operation for larger repositories.
 
     The performance-improving version of this feature is currently only
     implemented in Rust (see :hg:`help rust`), so people not using a version of
     Mercurial compiled with the Rust parts might actually suffer some slowdown.
     For this reason, such versions will by default refuse to access repositories
     with "persistent-nodemap".
 
     This behavior can be adjusted via configuration: check
     :hg:`help config.storage.revlog.persistent-nodemap.slow-path` for details.
 
     Repositories with this on-disk format require Mercurial 5.4 or above.
 
     By default this format variant is disabled if the fast implementation is not
     available, and enabled by default if the fast implementation is available.
 
     To accomodate installations of Mercurial without the fast implementation,
     you can downgrade your repository. To do so run the following command:
 
     $ hg debugupgraderepo \
           --run \
           --config format.use-persistent-nodemap=False \
           --config storage.revlog.persistent-nodemap.slow-path=allow
 
 ``use-share-safe``
     Enforce "safe" behaviors for all "shares" that access this repository.
 
     With this feature, "shares" using this repository as a source will:
 
     * read the source repository's configuration (`<source>/.hg/hgrc`).
     * read and use the source repository's "requirements"
       (except the working copy specific one).
 
     Without this feature, "shares" using this repository as a source will:
 
     * keep tracking the repository "requirements" in the share only, ignoring
       the source "requirements", possibly diverging from them.
     * ignore source repository config. This can create problems, like silently
       ignoring important hooks.
 
     Beware that existing shares will not be upgraded/downgraded, and by
     default, Mercurial will refuse to interact with them until the mismatch
     is resolved. See :hg:`help config.share.safe-mismatch.source-safe` and
     :hg:`help config.share.safe-mismatch.source-not-safe` for details.
 
     Introduced in Mercurial 5.7.
 
     Enabled by default in Mercurial 6.1.
 
 ``use-share-safe.automatic-upgrade-of-mismatching-repositories``
    When enabled, an automatic upgrade will be triggered when a repository format
    does not match its `use-share-safe` config.
 
    This is an advanced behavior that most users will not need. We recommend you
    don't use this unless you are a seasoned administrator of a Mercurial install
    base.
 
    Automatic upgrade means that any process accessing the repository will
    upgrade the repository format to use `share-safe`. This only triggers if a
    change is needed. This also applies to operation that would have been
    read-only (like hg status).
 
    If the repository cannot be locked, the automatic-upgrade operation will be
    skipped. The next operation will attempt it again.
 
    This configuration will apply for moves in any direction, either adding the
    `share-safe` format if `format.use-share-safe=yes` or removing the
    `share-safe` requirement if `format.use-share-safe=no`. So we recommend
    setting both this value and `format.use-share-safe` at the same time.
 
 ``use-share-safe.automatic-upgrade-of-mismatching-repositories:quiet``
     Hide message when performing such automatic upgrade.
 
 ``usestore``
     Enable or disable the "store" repository format which improves
     compatibility with systems that fold case or otherwise mangle
     filenames. Disabling this option will allow you to store longer filenames
     in some situations at the expense of compatibility.
 
     Repositories with this on-disk format require Mercurial version 0.9.4.
 
     Enabled by default.
 
 ``sparse-revlog``
     Enable or disable the ``sparse-revlog`` delta strategy. This format improves
     delta re-use inside revlog. For very branchy repositories, it results in a
     smaller store. For repositories with many revisions, it also helps
     performance (by using shortened delta chains.)
 
     Repositories with this on-disk format require Mercurial version 4.7
 
     Enabled by default.
 
 ``revlog-compression``
     Compression algorithm used by revlog. Supported values are `zlib` and
     `zstd`. The `zlib` engine is the historical default of Mercurial. `zstd` is
     a newer format that is usually a net win over `zlib`, operating faster at
     better compression rates. Use `zstd` to reduce CPU usage. Multiple values
     can be specified, the first available one will be used.
 
     On some systems, the Mercurial installation may lack `zstd` support.
 
     Default is `zstd` if available, `zlib` otherwise.
 
 ``bookmarks-in-store``
     Store bookmarks in .hg/store/. This means that bookmarks are shared when
     using `hg share` regardless of the `-B` option.
 
     Repositories with this on-disk format require Mercurial version 5.1.
 
     Disabled by default.
 
 
 ``graph``
 ---------
 
 Web graph view configuration. This section let you change graph
 elements display properties by branches, for instance to make the
 ``default`` branch stand out.
 
 Each line has the following format::
 
     <branch>.<argument> = <value>
 
 where ``<branch>`` is the name of the branch being
 customized. Example::
 
     [graph]
     # 2px width
     default.width = 2
     # red color
     default.color = FF0000
 
 Supported arguments:
 
 ``width``
     Set branch edges width in pixels.
 
 ``color``
     Set branch edges color in hexadecimal RGB notation.
 
 ``hooks``
 ---------
 
 Commands or Python functions that get automatically executed by
 various actions such as starting or finishing a commit. Multiple
 hooks can be run for the same action by appending a suffix to the
 action. Overriding a site-wide hook can be done by changing its
 value or setting it to an empty string.  Hooks can be prioritized
 by adding a prefix of ``priority.`` to the hook name on a new line
 and setting the priority. The default priority is 0.
 
 Example ``.hg/hgrc``::
 
   [hooks]
   # update working directory after adding changesets
   changegroup.update = hg update
   # do not use the site-wide hook
   incoming =
   incoming.email = /my/email/hook
   incoming.autobuild = /my/build/hook
   # force autobuild hook to run before other incoming hooks
   priority.incoming.autobuild = 1
   ###  control HGPLAIN setting when running autobuild hook
   # HGPLAIN always set (default from Mercurial 5.7)
   incoming.autobuild:run-with-plain = yes
   # HGPLAIN never set
   incoming.autobuild:run-with-plain = no
   # HGPLAIN inherited from environment (default before Mercurial 5.7)
   incoming.autobuild:run-with-plain = auto
 
 Most hooks are run with environment variables set that give useful
 additional information. For each hook below, the environment variables
 it is passed are listed with names in the form ``$HG_foo``. The
 ``$HG_HOOKTYPE`` and ``$HG_HOOKNAME`` variables are set for all hooks.
 They contain the type of hook which triggered the run and the full name
 of the hook in the config, respectively. In the example above, this will
 be ``$HG_HOOKTYPE=incoming`` and ``$HG_HOOKNAME=incoming.email``.
 
 .. container:: windows
 
   Some basic Unix syntax can be enabled for portability, including ``$VAR``
   and ``${VAR}`` style variables.  A ``~`` followed by ``\`` or ``/`` will
   be expanded to ``%USERPROFILE%`` to simulate a subset of tilde expansion
   on Unix.  To use a literal ``$`` or ``~``, it must be escaped with a back
   slash or inside of a strong quote.  Strong quotes will be replaced by
   double quotes after processing.
 
   This feature is enabled by adding a prefix of ``tonative.`` to the hook
   name on a new line, and setting it to ``True``.  For example::
 
     [hooks]
     incoming.autobuild = /my/build/hook
     # enable translation to cmd.exe syntax for autobuild hook
     tonative.incoming.autobuild = True
 
 ``changegroup``
   Run after a changegroup has been added via push, pull or unbundle.  The ID of
   the first new changeset is in ``$HG_NODE`` and last is in ``$HG_NODE_LAST``.
   The URL from which changes came is in ``$HG_URL``.
 
 ``commit``
   Run after a changeset has been created in the local repository. The ID
   of the newly created changeset is in ``$HG_NODE``. Parent changeset
   IDs are in ``$HG_PARENT1`` and ``$HG_PARENT2``.
 
 ``incoming``
   Run after a changeset has been pulled, pushed, or unbundled into
   the local repository. The ID of the newly arrived changeset is in
   ``$HG_NODE``. The URL that was source of the changes is in ``$HG_URL``.
 
 ``outgoing``
   Run after sending changes from the local repository to another. The ID of
   first changeset sent is in ``$HG_NODE``. The source of operation is in
   ``$HG_SOURCE``. Also see :hg:`help config.hooks.preoutgoing`.
 
 ``post-<command>``
   Run after successful invocations of the associated command. The
   contents of the command line are passed as ``$HG_ARGS`` and the result
   code in ``$HG_RESULT``. Parsed command line arguments are passed as
   ``$HG_PATS`` and ``$HG_OPTS``. These contain string representations of
   the python data internally passed to <command>. ``$HG_OPTS`` is a
   dictionary of options (with unspecified options set to their defaults).
   ``$HG_PATS`` is a list of arguments. Hook failure is ignored.
 
 ``fail-<command>``
   Run after a failed invocation of an associated command. The contents
   of the command line are passed as ``$HG_ARGS``. Parsed command line
   arguments are passed as ``$HG_PATS`` and ``$HG_OPTS``. These contain
   string representations of the python data internally passed to
   <command>. ``$HG_OPTS`` is a dictionary of options (with unspecified
   options set to their defaults). ``$HG_PATS`` is a list of arguments.
   Hook failure is ignored.
 
 ``pre-<command>``
   Run before executing the associated command. The contents of the
   command line are passed as ``$HG_ARGS``. Parsed command line arguments
   are passed as ``$HG_PATS`` and ``$HG_OPTS``. These contain string
   representations of the data internally passed to <command>. ``$HG_OPTS``
   is a dictionary of options (with unspecified options set to their
   defaults). ``$HG_PATS`` is a list of arguments. If the hook returns
   failure, the command doesn't execute and Mercurial returns the failure
   code.
 
 ``prechangegroup``
   Run before a changegroup is added via push, pull or unbundle. Exit
   status 0 allows the changegroup to proceed. A non-zero status will
   cause the push, pull or unbundle to fail. The URL from which changes
   will come is in ``$HG_URL``.
 
 ``precommit``
   Run before starting a local commit. Exit status 0 allows the
   commit to proceed. A non-zero status will cause the commit to fail.
   Parent changeset IDs are in ``$HG_PARENT1`` and ``$HG_PARENT2``.
 
 ``prelistkeys``
   Run before listing pushkeys (like bookmarks) in the
   repository. A non-zero status will cause failure. The key namespace is
   in ``$HG_NAMESPACE``.
 
 ``preoutgoing``
   Run before collecting changes to send from the local repository to
   another. A non-zero status will cause failure. This lets you prevent
   pull over HTTP or SSH. It can also prevent propagating commits (via
   local pull, push (outbound) or bundle commands), but not completely,
   since you can just copy files instead. The source of operation is in
   ``$HG_SOURCE``. If "serve", the operation is happening on behalf of a remote
   SSH or HTTP repository. If "push", "pull" or "bundle", the operation
   is happening on behalf of a repository on same system.
 
 ``prepushkey``
   Run before a pushkey (like a bookmark) is added to the
   repository. A non-zero status will cause the key to be rejected. The
   key namespace is in ``$HG_NAMESPACE``, the key is in ``$HG_KEY``,
   the old value (if any) is in ``$HG_OLD``, and the new value is in
   ``$HG_NEW``.
 
 ``pretag``
   Run before creating a tag. Exit status 0 allows the tag to be
   created. A non-zero status will cause the tag to fail. The ID of the
   changeset to tag is in ``$HG_NODE``. The name of tag is in ``$HG_TAG``. The
   tag is local if ``$HG_LOCAL=1``, or in the repository if ``$HG_LOCAL=0``.
 
 ``pretransmit-inline-clone-bundle``
   Run before transferring an inline clonebundle to the peer.
   If the exit status is 0, the inline clonebundle will be allowed to be
   transferred. A non-zero status will cause the transfer to fail.
   The path of the inline clonebundle is in ``$HG_CLONEBUNDLEPATH``.
 
 ``pretxnopen``
   Run before any new repository transaction is open. The reason for the
   transaction will be in ``$HG_TXNNAME``, and a unique identifier for the
   transaction will be in ``$HG_TXNID``. A non-zero status will prevent the
   transaction from being opened.
 
 ``pretxnclose``
   Run right before the transaction is actually finalized. Any repository change
   will be visible to the hook program. This lets you validate the transaction
   content or change it. Exit status 0 allows the commit to proceed. A non-zero
   status will cause the transaction to be rolled back. The reason for the
   transaction opening will be in ``$HG_TXNNAME``, and a unique identifier for
   the transaction will be in ``$HG_TXNID``. The rest of the available data will
   vary according the transaction type.  Changes unbundled to the repository will
   add ``$HG_URL`` and ``$HG_SOURCE``.  New changesets will add ``$HG_NODE`` (the
   ID of the first added changeset), ``$HG_NODE_LAST`` (the ID of the last added
   changeset).  Bookmark and phase changes will set ``$HG_BOOKMARK_MOVED`` and
   ``$HG_PHASES_MOVED`` to ``1`` respectively.  The number of new obsmarkers, if
   any, will be in ``$HG_NEW_OBSMARKERS``, etc.
 
 ``pretxnclose-bookmark``
   Run right before a bookmark change is actually finalized. Any repository
   change will be visible to the hook program. This lets you validate the
   transaction content or change it. Exit status 0 allows the commit to
   proceed. A non-zero status will cause the transaction to be rolled back.
   The name of the bookmark will be available in ``$HG_BOOKMARK``, the new
   bookmark location will be available in ``$HG_NODE`` while the previous
   location will be available in ``$HG_OLDNODE``. In case of a bookmark
   creation ``$HG_OLDNODE`` will be empty. In case of deletion ``$HG_NODE``
   will be empty.
   In addition, the reason for the transaction opening will be in
   ``$HG_TXNNAME``, and a unique identifier for the transaction will be in
   ``$HG_TXNID``.
 
 ``pretxnclose-phase``
   Run right before a phase change is actually finalized. Any repository change
   will be visible to the hook program. This lets you validate the transaction
   content or change it. Exit status 0 allows the commit to proceed.  A non-zero
   status will cause the transaction to be rolled back. The hook is called
   multiple times, once for each revision affected by a phase change.
   The affected node is available in ``$HG_NODE``, the phase in ``$HG_PHASE``
   while the previous ``$HG_OLDPHASE``. In case of new node, ``$HG_OLDPHASE``
   will be empty.  In addition, the reason for the transaction opening will be in
   ``$HG_TXNNAME``, and a unique identifier for the transaction will be in
   ``$HG_TXNID``. The hook is also run for newly added revisions. In this case
   the ``$HG_OLDPHASE`` entry will be empty.
 
 ``txnclose``
   Run after any repository transaction has been committed. At this
   point, the transaction can no longer be rolled back. The hook will run
   after the lock is released. See :hg:`help config.hooks.pretxnclose` for
   details about available variables.
 
 ``txnclose-bookmark``
   Run after any bookmark change has been committed. At this point, the
   transaction can no longer be rolled back. The hook will run after the lock
   is released. See :hg:`help config.hooks.pretxnclose-bookmark` for details
   about available variables.
 
 ``txnclose-phase``
   Run after any phase change has been committed. At this point, the
   transaction can no longer be rolled back. The hook will run after the lock
   is released. See :hg:`help config.hooks.pretxnclose-phase` for details about
   available variables.
 
 ``txnabort``
   Run when a transaction is aborted. See :hg:`help config.hooks.pretxnclose`
   for details about available variables.
 
 ``pretxnchangegroup``
   Run after a changegroup has been added via push, pull or unbundle, but before
   the transaction has been committed. The changegroup is visible to the hook
   program. This allows validation of incoming changes before accepting them.
   The ID of the first new changeset is in ``$HG_NODE`` and last is in
   ``$HG_NODE_LAST``. Exit status 0 allows the transaction to commit. A non-zero
   status will cause the transaction to be rolled back, and the push, pull or
   unbundle will fail. The URL that was the source of changes is in ``$HG_URL``.
 
 ``pretxncommit``
   Run after a changeset has been created, but before the transaction is
   committed. The changeset is visible to the hook program. This allows
   validation of the commit message and changes. Exit status 0 allows the
   commit to proceed. A non-zero status will cause the transaction to
   be rolled back. The ID of the new changeset is in ``$HG_NODE``. The parent
   changeset IDs are in ``$HG_PARENT1`` and ``$HG_PARENT2``.
 
 ``preupdate``
   Run before updating the working directory. Exit status 0 allows
   the update to proceed. A non-zero status will prevent the update.
   The changeset ID of first new parent is in ``$HG_PARENT1``. If updating to a
   merge, the ID of second new parent is in ``$HG_PARENT2``.
 
 ``listkeys``
   Run after listing pushkeys (like bookmarks) in the repository. The
   key namespace is in ``$HG_NAMESPACE``. ``$HG_VALUES`` is a
   dictionary containing the keys and values.
 
 ``pushkey``
   Run after a pushkey (like a bookmark) is added to the
   repository. The key namespace is in ``$HG_NAMESPACE``, the key is in
   ``$HG_KEY``, the old value (if any) is in ``$HG_OLD``, and the new
   value is in ``$HG_NEW``.
 
 ``tag``
   Run after a tag is created. The ID of the tagged changeset is in ``$HG_NODE``.
   The name of tag is in ``$HG_TAG``. The tag is local if ``$HG_LOCAL=1``, or in
   the repository if ``$HG_LOCAL=0``.
 
 ``update``
   Run after updating the working directory. The changeset ID of first
   new parent is in ``$HG_PARENT1``. If updating to a merge, the ID of second new
   parent is in ``$HG_PARENT2``. If the update succeeded, ``$HG_ERROR=0``. If the
   update failed (e.g. because conflicts were not resolved), ``$HG_ERROR=1``.
 
 .. note::
 
    It is generally better to use standard hooks rather than the
    generic pre- and post- command hooks, as they are guaranteed to be
    called in the appropriate contexts for influencing transactions.
    Also, hooks like "commit" will be called in all contexts that
    generate a commit (e.g. tag) and not just the commit command.
 
 .. note::
 
    Environment variables with empty values may not be passed to
    hooks on platforms such as Windows. As an example, ``$HG_PARENT2``
    will have an empty value under Unix-like platforms for non-merge
    changesets, while it will not be available at all under Windows.
 
 The syntax for Python hooks is as follows::
 
   hookname = python:modulename.submodule.callable
   hookname = python:/path/to/python/module.py:callable
 
 Python hooks are run within the Mercurial process. Each hook is
 called with at least three keyword arguments: a ui object (keyword
 ``ui``), a repository object (keyword ``repo``), and a ``hooktype``
 keyword that tells what kind of hook is used. Arguments listed as
 environment variables above are passed as keyword arguments, with no
 ``HG_`` prefix, and names in lower case.
 
 If a Python hook returns a "true" value or raises an exception, this
 is treated as a failure.
 
 
 ``hostfingerprints``
 --------------------
 
 (Deprecated. Use ``[hostsecurity]``'s ``fingerprints`` options instead.)
 
 Fingerprints of the certificates of known HTTPS servers.
 
 A HTTPS connection to a server with a fingerprint configured here will
 only succeed if the servers certificate matches the fingerprint.
 This is very similar to how ssh known hosts works.
 
 The fingerprint is the SHA-1 hash value of the DER encoded certificate.
 Multiple values can be specified (separated by spaces or commas). This can
 be used to define both old and new fingerprints while a host transitions
 to a new certificate.
 
 The CA chain and web.cacerts is not used for servers with a fingerprint.
 
 For example::
 
     [hostfingerprints]
     hg.intevation.de = fc:e2:8d:d9:51:cd:cb:c1:4d:18:6b:b7:44:8d:49:72:57:e6:cd:33
     hg.intevation.org = fc:e2:8d:d9:51:cd:cb:c1:4d:18:6b:b7:44:8d:49:72:57:e6:cd:33
 
 ``hostsecurity``
 ----------------
 
 Used to specify global and per-host security settings for connecting to
 other machines.
 
 The following options control default behavior for all hosts.
 
 ``ciphers``
     Defines the cryptographic ciphers to use for connections.
 
     Value must be a valid OpenSSL Cipher List Format as documented at
     https://www.openssl.org/docs/manmaster/apps/ciphers.html#CIPHER-LIST-FORMAT.
 
     This setting is for advanced users only. Setting to incorrect values
     can significantly lower connection security or decrease performance.
     You have been warned.
 
     This option requires Python 2.7.
 
 ``minimumprotocol``
     Defines the minimum channel encryption protocol to use.
 
     By default, the highest version of TLS supported by both client and server
     is used.
 
     Allowed values are: ``tls1.0``, ``tls1.1``, ``tls1.2``.
 
     When running on an old Python version, only ``tls1.0`` is allowed since
     old versions of Python only support up to TLS 1.0.
 
     When running a Python that supports modern TLS versions, the default is
     ``tls1.1``. ``tls1.0`` can still be used to allow TLS 1.0. However, this
     weakens security and should only be used as a feature of last resort if
     a server does not support TLS 1.1+.
 
 Options in the ``[hostsecurity]`` section can have the form
 ``hostname``:``setting``. This allows multiple settings to be defined on a
 per-host basis.
 
 The following per-host settings can be defined.
 
 ``ciphers``
     This behaves like ``ciphers`` as described above except it only applies
     to the host on which it is defined.
 
 ``fingerprints``
     A list of hashes of the DER encoded peer/remote certificate. Values have
     the form ``algorithm``:``fingerprint``. e.g.
     ``sha256:c3ab8ff13720e8ad9047dd39466b3c8974e592c2fa383d4a3960714caef0c4f2``.
     In addition, colons (``:``) can appear in the fingerprint part.
 
     The following algorithms/prefixes are supported: ``sha1``, ``sha256``,
     ``sha512``.
 
     Use of ``sha256`` or ``sha512`` is preferred.
 
     If a fingerprint is specified, the CA chain is not validated for this
     host and Mercurial will require the remote certificate to match one
     of the fingerprints specified. This means if the server updates its
     certificate, Mercurial will abort until a new fingerprint is defined.
     This can provide stronger security than traditional CA-based validation
     at the expense of convenience.
 
     This option takes precedence over ``verifycertsfile``.
 
 ``minimumprotocol``
     This behaves like ``minimumprotocol`` as described above except it
     only applies to the host on which it is defined.
 
 ``verifycertsfile``
     Path to file a containing a list of PEM encoded certificates used to
     verify the server certificate. Environment variables and ``~user``
     constructs are expanded in the filename.
 
     The server certificate or the certificate's certificate authority (CA)
     must match a certificate from this file or certificate verification
     will fail and connections to the server will be refused.
 
     If defined, only certificates provided by this file will be used:
     ``web.cacerts`` and any system/default certificates will not be
     used.
 
     This option has no effect if the per-host ``fingerprints`` option
     is set.
 
     The format of the file is as follows::
 
         -----BEGIN CERTIFICATE-----
         ... (certificate in base64 PEM encoding) ...
         -----END CERTIFICATE-----
         -----BEGIN CERTIFICATE-----
         ... (certificate in base64 PEM encoding) ...
         -----END CERTIFICATE-----
 
 For example::
 
     [hostsecurity]
     hg.example.com:fingerprints = sha256:c3ab8ff13720e8ad9047dd39466b3c8974e592c2fa383d4a3960714caef0c4f2
     hg2.example.com:fingerprints = sha1:914f1aff87249c09b6859b88b1906d30756491ca, sha1:fc:e2:8d:d9:51:cd:cb:c1:4d:18:6b:b7:44:8d:49:72:57:e6:cd:33
     hg3.example.com:fingerprints = sha256:9a:b0:dc:e2:75:ad:8a:b7:84:58:e5:1f:07:32:f1:87:e6:bd:24:22:af:b7:ce:8e:9c:b4:10:cf:b9:f4:0e:d2
     foo.example.com:verifycertsfile = /etc/ssl/trusted-ca-certs.pem
 
 To change the default minimum protocol version to TLS 1.2 but to allow TLS 1.1
 when connecting to ``hg.example.com``::
 
     [hostsecurity]
     minimumprotocol = tls1.2
     hg.example.com:minimumprotocol = tls1.1
 
 ``http_proxy``
 --------------
 
 Used to access web-based Mercurial repositories through a HTTP
 proxy.
 
 ``host``
     Host name and (optional) port of the proxy server, for example
     "myproxy:8000".
 
 ``no``
     Optional. Comma-separated list of host names that should bypass
     the proxy.
 
 ``passwd``
     Optional. Password to authenticate with at the proxy server.
 
 ``user``
     Optional. User name to authenticate with at the proxy server.
 
 ``always``
     Optional. Always use the proxy, even for localhost and any entries
     in ``http_proxy.no``. (default: False)
 
 ``http``
 --------
 
 Used to configure access to Mercurial repositories via HTTP.
 
 ``timeout``
     If set, blocking operations will timeout after that many seconds.
     (default: None)
 
 ``merge``
 ---------
 
 This section specifies behavior during merges and updates.
 
 ``checkignored``
    Controls behavior when an ignored file on disk has the same name as a tracked
    file in the changeset being merged or updated to, and has different
    contents. Options are ``abort``, ``warn`` and ``ignore``. With ``abort``,
    abort on such files. With ``warn``, warn on such files and back them up as
    ``.orig``. With ``ignore``, don't print a warning and back them up as
    ``.orig``. (default: ``abort``)
 
 ``checkunknown``
    Controls behavior when an unknown file that isn't ignored has the same name
    as a tracked file in the changeset being merged or updated to, and has
    different contents. Similar to ``merge.checkignored``, except for files that
    are not ignored. (default: ``abort``)
 
 ``on-failure``
    When set to ``continue`` (the default), the merge process attempts to
    merge all unresolved files using the merge chosen tool, regardless of
    whether previous file merge attempts during the process succeeded or not.
    Setting this to ``prompt`` will prompt after any merge failure continue
    or halt the merge process. Setting this to ``halt`` will automatically
    halt the merge process on any merge tool failure. The merge process
    can be restarted by using the ``resolve`` command. When a merge is
    halted, the repository is left in a normal ``unresolved`` merge state.
    (default: ``continue``)
 
 ``strict-capability-check``
    Whether capabilities of internal merge tools are checked strictly
    or not, while examining rules to decide merge tool to be used.
    (default: False)
 
 ``merge-patterns``
 ------------------
 
 This section specifies merge tools to associate with particular file
 patterns. Tools matched here will take precedence over the default
 merge tool. Patterns are globs by default, rooted at the repository
 root.
 
 Example::
 
   [merge-patterns]
   **.c = kdiff3
   **.jpg = myimgmerge
 
 ``merge-tools``
 ---------------
 
 This section configures external merge tools to use for file-level
 merges. This section has likely been preconfigured at install time.
 Use :hg:`config merge-tools` to check the existing configuration.
 Also see :hg:`help merge-tools` for more details.
 
 Example ``~/.hgrc``::
 
   [merge-tools]
   # Override stock tool location
   kdiff3.executable = ~/bin/kdiff3
   # Specify command line
   kdiff3.args = $base $local $other -o $output
   # Give higher priority
   kdiff3.priority = 1
 
   # Changing the priority of preconfigured tool
   meld.priority = 0
 
   # Disable a preconfigured tool
   vimdiff.disabled = yes
 
   # Define new tool
   myHtmlTool.args = -m $local $other $base $output
   myHtmlTool.regkey = Software\FooSoftware\HtmlMerge
   myHtmlTool.priority = 1
 
 Supported arguments:
 
 ``priority``
   The priority in which to evaluate this tool.
   (default: 0)
 
 ``executable``
   Either just the name of the executable or its pathname.
 
   .. container:: windows
 
     On Windows, the path can use environment variables with ${ProgramFiles}
     syntax.
 
   (default: the tool name)
 
 ``args``
   The arguments to pass to the tool executable. You can refer to the
   files being merged as well as the output file through these
   variables: ``$base``, ``$local``, ``$other``, ``$output``.
 
   The meaning of ``$local`` and ``$other`` can vary depending on which action is
   being performed. During an update or merge, ``$local`` represents the original
   state of the file, while ``$other`` represents the commit you are updating to or
   the commit you are merging with. During a rebase, ``$local`` represents the
   destination of the rebase, and ``$other`` represents the commit being rebased.
 
   Some operations define custom labels to assist with identifying the revisions,
   accessible via ``$labellocal``, ``$labelother``, and ``$labelbase``. If custom
   labels are not available, these will be ``local``, ``other``, and ``base``,
   respectively.
   (default: ``$local $base $other``)
 
 ``premerge``
   Attempt to run internal non-interactive 3-way merge tool before
   launching external tool.  Options are ``true``, ``false``, ``keep``,
   ``keep-merge3``, or ``keep-mergediff`` (experimental). The ``keep`` option
   will leave markers in the file if the premerge fails. The ``keep-merge3``
   will do the same but include information about the base of the merge in the
   marker (see internal :merge3 in :hg:`help merge-tools`). The
   ``keep-mergediff`` option is similar but uses a different marker style
   (see internal :merge3 in :hg:`help merge-tools`). (default: True)
 
 ``binary``
   This tool can merge binary files. (default: False, unless tool
   was selected by file pattern match)
 
 ``symlink``
   This tool can merge symlinks. (default: False)
 
 ``check``
   A list of merge success-checking options:
 
   ``changed``
     Ask whether merge was successful when the merged file shows no changes.
   ``conflicts``
     Check whether there are conflicts even though the tool reported success.
   ``prompt``
     Always prompt for merge success, regardless of success reported by tool.
 
 ``fixeol``
   Attempt to fix up EOL changes caused by the merge tool.
   (default: False)
 
 ``gui``
   This tool requires a graphical interface to run. (default: False)
 
 ``mergemarkers``
   Controls whether the labels passed via ``$labellocal``, ``$labelother``, and
   ``$labelbase`` are ``detailed`` (respecting ``mergemarkertemplate``) or
   ``basic``. If ``premerge`` is ``keep`` or ``keep-merge3``, the conflict
   markers generated during premerge will be ``detailed`` if either this option or
   the corresponding option in the ``[ui]`` section is ``detailed``.
   (default: ``basic``)
 
 ``mergemarkertemplate``
   This setting can be used to override ``mergemarker`` from the
   ``[command-templates]`` section on a per-tool basis; this applies to the
   ``$label``-prefixed variables and to the conflict markers that are generated
   if ``premerge`` is ``keep` or ``keep-merge3``. See the corresponding variable
   in ``[ui]`` for more information.
 
 .. container:: windows
 
   ``regkey``
     Windows registry key which describes install location of this
     tool. Mercurial will search for this key first under
     ``HKEY_CURRENT_USER`` and then under ``HKEY_LOCAL_MACHINE``.
     (default: None)
 
   ``regkeyalt``
     An alternate Windows registry key to try if the first key is not
     found.  The alternate key uses the same ``regname`` and ``regappend``
     semantics of the primary key.  The most common use for this key
     is to search for 32bit applications on 64bit operating systems.
     (default: None)
 
   ``regname``
     Name of value to read from specified registry key.
     (default: the unnamed (default) value)
 
   ``regappend``
     String to append to the value read from the registry, typically
     the executable name of the tool.
     (default: None)
 
 ``pager``
 ---------
 
 Setting used to control when to paginate and with what external tool. See
 :hg:`help pager` for details.
 
 ``pager``
     Define the external tool used as pager.
 
     If no pager is set, Mercurial uses the environment variable $PAGER.
     If neither pager.pager, nor $PAGER is set, a default pager will be
     used, typically `less` on Unix and `more` on Windows. Example::
 
       [pager]
       pager = less -FRX
 
 ``ignore``
     List of commands to disable the pager for. Example::
 
       [pager]
       ignore = version, help, update
 
 ``patch``
 ---------
 
 Settings used when applying patches, for instance through the 'import'
 command or with Mercurial Queues extension.
 
 ``eol``
     When set to 'strict' patch content and patched files end of lines
     are preserved. When set to ``lf`` or ``crlf``, both files end of
     lines are ignored when patching and the result line endings are
     normalized to either LF (Unix) or CRLF (Windows). When set to
     ``auto``, end of lines are again ignored while patching but line
     endings in patched files are normalized to their original setting
     on a per-file basis. If target file does not exist or has no end
     of line, patch line endings are preserved.
     (default: strict)
 
 ``fuzz``
     The number of lines of 'fuzz' to allow when applying patches. This
     controls how much context the patcher is allowed to ignore when
     trying to apply a patch.
     (default: 2)
 
 ``paths``
 ---------
 
 Assigns symbolic names and behavior to repositories.
 
 Options are symbolic names defining the URL or directory that is the
 location of the repository. Example::
 
     [paths]
     my_server = https://example.com/my_repo
     local_path = /home/me/repo
 
 These symbolic names can be used from the command line. To pull
 from ``my_server``: :hg:`pull my_server`. To push to ``local_path``:
 :hg:`push local_path`. You can check :hg:`help urls` for details about
 valid URLs.
 
 Options containing colons (``:``) denote sub-options that can influence
 behavior for that specific path. Example::
 
     [paths]
     my_server = https://example.com/my_path
     my_server:pushurl = ssh://example.com/my_path
 
 Paths using the `path://otherpath` scheme will inherit the sub-options value from
 the path they point to.
 
 The following sub-options can be defined:
 
 ``multi-urls``
    A boolean option. When enabled the value of the `[paths]` entry will be
    parsed as a list and the alias will resolve to multiple destination. If some
    of the list entry use the `path://` syntax, the suboption will be inherited
    individually.
 
 ``pushurl``
    The URL to use for push operations. If not defined, the location
    defined by the path's main entry is used.
 
 ``pushrev``
    A revset defining which revisions to push by default.
 
    When :hg:`push` is executed without a ``-r`` argument, the revset
    defined by this sub-option is evaluated to determine what to push.
 
    For example, a value of ``.`` will push the working directory's
    revision by default.
 
    Revsets specifying bookmarks will not result in the bookmark being
    pushed.
 
 ``bookmarks.mode``
   How bookmark will be dealt during the exchange. It support the following value
 
   - ``default``: the default behavior, local and remote bookmarks are "merged"
     on push/pull.
 
   - ``mirror``: when pulling, replace local bookmarks by remote bookmarks. This
     is useful to replicate a repository, or as an optimization.
 
   - ``ignore``: ignore bookmarks during exchange.
     (This currently only affect pulling)
 
 .. container:: verbose
 
   ``pulled-delta-reuse-policy``
   Control the policy regarding deltas sent by the remote during pulls.
 
   This is an advanced option that non-admin users should not need to understand
   or set. This option can be used to speed up pulls from trusted central
   servers, or to fix-up deltas from older servers.
 
   It supports the following values:
 
   - ``default``: use the policy defined by
     `storage.revlog.reuse-external-delta-parent`,
 
   - ``no-reuse``: start a new optimal delta search for each new revision we add
     to the repository. The deltas from the server will be reused when the base
     it applies to is tested (this can be frequent if that base is the one and
     unique parent of that revision). This can significantly slowdown pulls but
     will result in an optimized storage space if the remote peer is sending poor
     quality deltas.
 
   - ``try-base``: try to reuse the deltas from the remote peer as long as they
     create a valid delta-chain in the local repository. This speeds up the
     unbundling process, but can result in sub-optimal storage space if the
     remote peer is sending poor quality deltas.
 
   - ``forced``: the deltas from the peer will be reused in all cases, even if
     the resulting delta-chain is "invalid". This setting will ensure the bundle
     is applied at minimal CPU cost, but it can result in longer delta chains
     being created on the client, making revisions potentially slower to access
     in the future. If you think you need this option, you should make sure you
     are also talking to the Mercurial developer community to get confirmation.
 
   See `hg help config.storage.revlog.reuse-external-delta-parent` for a similar
   global option. That option defines the behavior of `default`.
 
 The following special named paths exist:
 
 ``default``
    The URL or directory to use when no source or remote is specified.
 
    :hg:`clone` will automatically define this path to the location the
    repository was cloned from.
 
 ``default-push``
    (deprecated) The URL or directory for the default :hg:`push` location.
    ``default:pushurl`` should be used instead.
 
 ``phases``
 ----------
 
 Specifies default handling of phases. See :hg:`help phases` for more
 information about working with phases.
 
 ``publish``
     Controls draft phase behavior when working as a server. When true,
     pushed changesets are set to public in both client and server and
     pulled or cloned changesets are set to public in the client.
     (default: True)
 
 ``new-commit``
     Phase of newly-created commits.
     (default: draft)
 
 ``checksubrepos``
     Check the phase of the current revision of each subrepository. Allowed
     values are "ignore", "follow" and "abort". For settings other than
     "ignore", the phase of the current revision of each subrepository is
     checked before committing the parent repository. If any of those phases is
     greater than the phase of the parent repository (e.g. if a subrepo is in a
     "secret" phase while the parent repo is in "draft" phase), the commit is
     either aborted (if checksubrepos is set to "abort") or the higher phase is
     used for the parent repository commit (if set to "follow").
     (default: follow)
 
 
 ``profiling``
 -------------
 
 Specifies profiling type, format, and file output. Two profilers are
 supported: an instrumenting profiler (named ``ls``), and a sampling
 profiler (named ``stat``).
 
 In this section description, 'profiling data' stands for the raw data
 collected during profiling, while 'profiling report' stands for a
 statistical text report generated from the profiling data.
 
 ``enabled``
     Enable the profiler.
     (default: false)
 
     This is equivalent to passing ``--profile`` on the command line.
 
 ``type``
     The type of profiler to use.
     (default: stat)
 
     ``ls``
       Use Python's built-in instrumenting profiler. This profiler
       works on all platforms, but each line number it reports is the
       first line of a function. This restriction makes it difficult to
       identify the expensive parts of a non-trivial function.
     ``stat``
       Use a statistical profiler, statprof. This profiler is most
       useful for profiling commands that run for longer than about 0.1
       seconds.
 
 ``format``
     Profiling format.  Specific to the ``ls`` instrumenting profiler.
     (default: text)
 
     ``text``
       Generate a profiling report. When saving to a file, it should be
       noted that only the report is saved, and the profiling data is
       not kept.
     ``kcachegrind``
       Format profiling data for kcachegrind use: when saving to a
       file, the generated file can directly be loaded into
       kcachegrind.
 
 ``statformat``
     Profiling format for the ``stat`` profiler.
     (default: hotpath)
 
     ``hotpath``
       Show a tree-based display containing the hot path of execution (where
       most time was spent).
     ``bymethod``
       Show a table of methods ordered by how frequently they are active.
     ``byline``
       Show a table of lines in files ordered by how frequently they are active.
     ``json``
       Render profiling data as JSON.
 
 ``freq``
     Sampling frequency.  Specific to the ``stat`` sampling profiler.
     (default: 1000)
 
 ``output``
     File path where profiling data or report should be saved. If the
     file exists, it is replaced. (default: None, data is printed on
     stderr)
 
 ``sort``
     Sort field.  Specific to the ``ls`` instrumenting profiler.
     One of ``callcount``, ``reccallcount``, ``totaltime`` and
     ``inlinetime``.
     (default: inlinetime)
 
 ``time-track``
     Control if the stat profiler track ``cpu`` or ``real`` time.
     (default: ``cpu`` on Windows, otherwise ``real``)
 
 ``limit``
     Number of lines to show. Specific to the ``ls`` instrumenting profiler.
     (default: 30)
 
 ``nested``
     Show at most this number of lines of drill-down info after each main entry.
     This can help explain the difference between Total and Inline.
     Specific to the ``ls`` instrumenting profiler.
     (default: 0)
 
 ``showmin``
     Minimum fraction of samples an entry must have for it to be displayed.
     Can be specified as a float between ``0.0`` and ``1.0`` or can have a
     ``%`` afterwards to allow values up to ``100``. e.g. ``5%``.
 
     Only used by the ``stat`` profiler.
 
     For the ``hotpath`` format, default is ``0.05``.
     For the ``chrome`` format, default is ``0.005``.
 
     The option is unused on other formats.
 
 ``showmax``
     Maximum fraction of samples an entry can have before it is ignored in
     display. Values format is the same as ``showmin``.
 
     Only used by the ``stat`` profiler.
 
     For the ``chrome`` format, default is ``0.999``.
 
     The option is unused on other formats.
 
 ``showtime``
     Show time taken as absolute durations, in addition to percentages.
     Only used by the ``hotpath`` format.
     (default: true)
 
 ``progress``
 ------------
 
 Mercurial commands can draw progress bars that are as informative as
 possible. Some progress bars only offer indeterminate information, while others
 have a definite end point.
 
 ``debug``
     Whether to print debug info when updating the progress bar. (default: False)
 
 ``delay``
     Number of seconds (float) before showing the progress bar. (default: 3)
 
 ``changedelay``
     Minimum delay before showing a new topic. When set to less than 3 * refresh,
     that value will be used instead. (default: 1)
 
 ``estimateinterval``
     Maximum sampling interval in seconds for speed and estimated time
     calculation. (default: 60)
 
 ``refresh``
     Time in seconds between refreshes of the progress bar. (default: 0.1)
 
 ``format``
     Format of the progress bar.
 
     Valid entries for the format field are ``topic``, ``bar``, ``number``,
     ``unit``, ``estimate``, ``speed``, and ``item``. ``item`` defaults to the
     last 20 characters of the item, but this can be changed by adding either
     ``-<num>`` which would take the last num characters, or ``+<num>`` for the
     first num characters.
 
     (default: topic bar number estimate)
 
 ``width``
     If set, the maximum width of the progress information (that is, min(width,
     term width) will be used).
 
 ``clear-complete``
     Clear the progress bar after it's done. (default: True)
 
 ``disable``
     If true, don't show a progress bar.
 
 ``assume-tty``
     If true, ALWAYS show a progress bar, unless disable is given.
 
 ``rebase``
 ----------
 
 ``evolution.allowdivergence``
     Default to False, when True allow creating divergence when performing
     rebase of obsolete changesets.
 
 ``revsetalias``
 ---------------
 
 Alias definitions for revsets. See :hg:`help revsets` for details.
 
 ``rewrite``
 -----------
 
 ``backup-bundle``
     Whether to save stripped changesets to a bundle file. (default: True)
 
 ``update-timestamp``
     If true, updates the date and time of the changeset to current. It is only
     applicable for `hg amend`, `hg commit --amend` and `hg uncommit` in the
     current version.
 
 ``empty-successor``
 
     Control what happens with empty successors that are the result of rewrite
     operations. If set to ``skip``, the successor is not created. If set to
     ``keep``, the empty successor is created and kept.
 
     Currently, only the rebase and absorb commands consider this configuration.
     (EXPERIMENTAL)
 
 ``rhg``
 -------
 
 The pure Rust fast-path for Mercurial. See `rust/README.rst` in the Mercurial repository.
 
 ``fallback-executable``
     Path to the executable to run in a sub-process when falling back to
     another implementation of Mercurial.
 
 ``fallback-immediately``
     Fall back to ``fallback-executable`` as soon as possible, regardless of
     the `rhg.on-unsupported` configuration. Useful for debugging, for example to
     bypass `rhg` if the deault `hg` points to `rhg`.
 
     Note that because this requires loading the configuration, it is possible
     that `rhg` error out before being able to fall back.
 
 ``ignored-extensions``
     Controls which extensions should be ignored by `rhg`. By default, `rhg`
     triggers the `rhg.on-unsupported` behavior any unsupported extensions.
     Users can disable that behavior when they know that a given extension
     does not need support from `rhg`.
 
     Expects a list of extension names, or ``*`` to ignore all extensions.
 
     Note: ``*:<suboption>`` is also a valid extension name for this
     configuration option.
     As of this writing, the only valid "global" suboption is ``required``.
 
 ``on-unsupported``
     Controls the behavior of `rhg` when detecting unsupported features.
 
     Possible values are `abort` (default), `abort-silent` and `fallback`.
 
     ``abort``
         Print an error message describing what feature is not supported,
         and exit with code 252
 
     ``abort-silent``
         Silently exit with code 252
 
     ``fallback``
         Try running the fallback executable with the same parameters
         (and trace the fallback reason, use `RUST_LOG=trace` to see).
 
 ``share``
 ---------
 
 ``safe-mismatch.source-safe``
     Controls what happens when the shared repository does not use the
     share-safe mechanism but its source repository does.
 
     Possible values are `abort` (default), `allow`, `upgrade-abort` and
     `upgrade-allow`.
 
     ``abort``
         Disallows running any command and aborts
     ``allow``
         Respects the feature presence in the share source
     ``upgrade-abort``
         Tries to upgrade the share to use share-safe; if it fails, aborts
     ``upgrade-allow``
         Tries to upgrade the share; if it fails, continue by
         respecting the share source setting
 
     Check :hg:`help config.format.use-share-safe` for details about the
     share-safe feature.
 
 ``safe-mismatch.source-safe:verbose-upgrade``
     Display a message when upgrading, (default: True)
 
 ``safe-mismatch.source-safe.warn``
     Shows a warning on operations if the shared repository does not use
     share-safe, but the source repository does.
     (default: True)
 
 ``safe-mismatch.source-not-safe``
     Controls what happens when the shared repository uses the share-safe
     mechanism but its source does not.
 
     Possible values are `abort` (default), `allow`, `downgrade-abort` and
     `downgrade-allow`.
 
     ``abort``
         Disallows running any command and aborts
     ``allow``
         Respects the feature presence in the share source
     ``downgrade-abort``
         Tries to downgrade the share to not use share-safe; if it fails, aborts
     ``downgrade-allow``
         Tries to downgrade the share to not use share-safe;
         if it fails, continue by respecting the shared source setting
 
     Check :hg:`help config.format.use-share-safe` for details about the
     share-safe feature.
 
 ``safe-mismatch.source-not-safe:verbose-upgrade``
     Display a message when upgrading, (default: True)
 
 ``safe-mismatch.source-not-safe.warn``
     Shows a warning on operations if the shared repository uses share-safe,
     but the source repository does not.
     (default: True)
 
 ``storage``
 -----------
 
 Control the strategy Mercurial uses internally to store history. Options in this
 category impact performance and repository size.
 
 ``revlog.issue6528.fix-incoming``
     Version 5.8 of Mercurial had a bug leading to altering the parent of file
     revision with copy information (or any other metadata) on exchange. This
     leads to the copy metadata to be overlooked by various internal logic. The
     issue was fixed in Mercurial 5.8.1.
     (See https://bz.mercurial-scm.org/show_bug.cgi?id=6528 for details)
 
     As a result Mercurial is now checking and fixing incoming file revisions to
     make sure there parents are in the right order. This behavior can be
     disabled by setting this option to `no`. This apply to revisions added
     through push, pull, clone and unbundle.
 
     To fix affected revisions that already exist within the repository, one can
     use :hg:`debug-repair-issue-6528`.
 
 .. container:: verbose
 
     ``revlog.delta-parent-search.candidate-group-chunk-size``
         Tune the number of delta bases the storage will consider in the
         same "round" of search. In some very rare cases, using a smaller value
         might result in faster processing at the possible expense of storage
         space, while using larger values might result in slower processing at the
         possible benefit of storage space. A value of "0" means no limitation.
 
         default: no limitation
 
         This is unlikely that you'll have to tune this configuration. If you think
         you do, consider talking with the mercurial developer community about your
         repositories.
 
 ``revlog.optimize-delta-parent-choice``
     When storing a merge revision, both parents will be equally considered as
     a possible delta base. This results in better delta selection and improved
     revlog compression. This option is enabled by default.
 
     Turning this option off can result in large increase of repository size for
     repository with many merges.
 
 ``revlog.persistent-nodemap.mmap``
     Whether to use the Operating System "memory mapping" feature (when
     possible) to access the persistent nodemap data. This improve performance
     and reduce memory pressure.
 
     Default to True.
 
     For details on the "persistent-nodemap" feature, see:
     :hg:`help config.format.use-persistent-nodemap`.
 
 ``revlog.persistent-nodemap.slow-path``
     Control the behavior of Merucrial when using a repository with "persistent"
     nodemap with an installation of Mercurial without a fast implementation for
     the feature:
 
     ``allow``: Silently use the slower implementation to access the repository.
     ``warn``: Warn, but use the slower implementation to access the repository.
     ``abort``: Prevent access to such repositories. (This is the default)
 
     For details on the "persistent-nodemap" feature, see:
     :hg:`help config.format.use-persistent-nodemap`.
 
 ``revlog.reuse-external-delta-parent``
     Control the order in which delta parents are considered when adding new
     revisions from an external source.
     (typically: apply bundle from `hg pull` or `hg push`).
 
     New revisions are usually provided as a delta against other revisions. By
     default, Mercurial will try to reuse this delta first, therefore using the
     same "delta parent" as the source. Directly using delta's from the source
     reduces CPU usage and usually speeds up operation. However, in some case,
     the source might have sub-optimal delta bases and forcing their reevaluation
     is useful. For example, pushes from an old client could have sub-optimal
     delta's parent that the server want to optimize. (lack of general delta, bad
     parents, choice, lack of sparse-revlog, etc).
 
     This option is enabled by default. Turning it off will ensure bad delta
     parent choices from older client do not propagate to this repository, at
     the cost of a small increase in CPU consumption.
 
     Note: this option only control the order in which delta parents are
     considered.  Even when disabled, the existing delta from the source will be
     reused if the same delta parent is selected.
 
 ``revlog.reuse-external-delta``
     Control the reuse of delta from external source.
     (typically: apply bundle from `hg pull` or `hg push`).
 
     New revisions are usually provided as a delta against another revision. By
     default, Mercurial will not recompute the same delta again, trusting
     externally provided deltas. There have been rare cases of small adjustment
     to the diffing algorithm in the past. So in some rare case, recomputing
     delta provided by ancient clients can provides better results. Disabling
     this option means going through a full delta recomputation for all incoming
     revisions. It means a large increase in CPU usage and will slow operations
     down.
 
     This option is enabled by default. When disabled, it also disables the
     related ``storage.revlog.reuse-external-delta-parent`` option.
 
 ``revlog.zlib.level``
     Zlib compression level used when storing data into the repository. Accepted
     Value range from 1 (lowest compression) to 9 (highest compression). Zlib
     default value is 6.
 
 
 ``revlog.zstd.level``
     zstd compression level used when storing data into the repository. Accepted
     Value range from 1 (lowest compression) to 22 (highest compression).
     (default 3)
 
 ``server``
 ----------
 
 Controls generic server settings.
 
 ``bookmarks-pushkey-compat``
     Trigger pushkey hook when being pushed bookmark updates. This config exist
     for compatibility purpose (default to True)
 
     If you use ``pushkey`` and ``pre-pushkey`` hooks to control bookmark
     movement we recommend you migrate them to ``txnclose-bookmark`` and
     ``pretxnclose-bookmark``.
 
 ``compressionengines``
     List of compression engines and their relative priority to advertise
     to clients.
 
     The order of compression engines determines their priority, the first
     having the highest priority. If a compression engine is not listed
     here, it won't be advertised to clients.
 
     If not set (the default), built-in defaults are used. Run
     :hg:`debuginstall` to list available compression engines and their
     default wire protocol priority.
 
     Older Mercurial clients only support zlib compression and this setting
     has no effect for legacy clients.
 
 ``uncompressed``
     Whether to allow clients to clone a repository using the
     uncompressed streaming protocol. This transfers about 40% more
     data than a regular clone, but uses less memory and CPU on both
     server and client. Over a LAN (100 Mbps or better) or a very fast
     WAN, an uncompressed streaming clone is a lot faster (~10x) than a
     regular clone. Over most WAN connections (anything slower than
     about 6 Mbps), uncompressed streaming is slower, because of the
     extra data transfer overhead. This mode will also temporarily hold
     the write lock while determining what data to transfer.
     (default: True)
 
 ``uncompressedallowsecret``
     Whether to allow stream clones when the repository contains secret
     changesets. (default: False)
 
 ``preferuncompressed``
     When set, clients will try to use the uncompressed streaming
     protocol. (default: False)
 
 ``disablefullbundle``
     When set, servers will refuse attempts to do pull-based clones.
     If this option is set, ``preferuncompressed`` and/or clone bundles
     are highly recommended. Partial clones will still be allowed.
     (default: False)
 
 ``streamunbundle``
     When set, servers will apply data sent from the client directly,
     otherwise it will be written to a temporary file first. This option
     effectively prevents concurrent pushes.
 
 ``pullbundle``
     When set, the server will check pullbundles.manifest for bundles
     covering the requested heads and common nodes. The first matching
     entry will be streamed to the client.
 
     For HTTP transport, the stream will still use zlib compression
     for older clients.
 
 ``concurrent-push-mode``
     Level of allowed race condition between two pushing clients.
 
     - 'strict': push is abort if another client touched the repository
       while the push was preparing.
     - 'check-related': push is only aborted if it affects head that got also
       affected while the push was preparing. (default since 5.4)
 
     'check-related' only takes effect for compatible clients (version
     4.3 and later). Older clients will use 'strict'.
 
 ``validate``
     Whether to validate the completeness of pushed changesets by
     checking that all new file revisions specified in manifests are
     present. (default: False)
 
 ``maxhttpheaderlen``
     Instruct HTTP clients not to send request headers longer than this
     many bytes. (default: 1024)
 
 ``bundle1``
     Whether to allow clients to push and pull using the legacy bundle1
     exchange format. (default: True)
 
 ``bundle1gd``
     Like ``bundle1`` but only used if the repository is using the
     *generaldelta* storage format. (default: True)
 
 ``bundle1.push``
     Whether to allow clients to push using the legacy bundle1 exchange
     format. (default: True)
 
 ``bundle1gd.push``
     Like ``bundle1.push`` but only used if the repository is using the
     *generaldelta* storage format. (default: True)
 
 ``bundle1.pull``
     Whether to allow clients to pull using the legacy bundle1 exchange
     format. (default: True)
 
 ``bundle1gd.pull``
     Like ``bundle1.pull`` but only used if the repository is using the
     *generaldelta* storage format. (default: True)
 
     Large repositories using the *generaldelta* storage format should
     consider setting this option because converting *generaldelta*
     repositories to the exchange format required by the bundle1 data
     format can consume a lot of CPU.
 
 ``bundle2.stream``
     Whether to allow clients to pull using the bundle2 streaming protocol.
     (default: True)
 
 ``zliblevel``
     Integer between ``-1`` and ``9`` that controls the zlib compression level
     for wire protocol commands that send zlib compressed output (notably the
     commands that send repository history data).
 
     The default (``-1``) uses the default zlib compression level, which is
     likely equivalent to ``6``. ``0`` means no compression. ``9`` means
     maximum compression.
 
     Setting this option allows server operators to make trade-offs between
     bandwidth and CPU used. Lowering the compression lowers CPU utilization
     but sends more bytes to clients.
 
     This option only impacts the HTTP server.
 
 ``zstdlevel``
     Integer between ``1`` and ``22`` that controls the zstd compression level
     for wire protocol commands. ``1`` is the minimal amount of compression and
     ``22`` is the highest amount of compression.
 
     The default (``3``) should be significantly faster than zlib while likely
     delivering better compression ratios.
 
     This option only impacts the HTTP server.
 
     See also ``server.zliblevel``.
 
 ``view``
     Repository filter used when exchanging revisions with the peer.
 
     The default view (``served``) excludes secret and hidden changesets.
     Another useful value is ``immutable`` (no draft, secret or hidden
     changesets). (EXPERIMENTAL)
 
 ``smtp``
 --------
 
 Configuration for extensions that need to send email messages.
 
 ``host``
     Host name of mail server, e.g. "mail.example.com".
 
 ``port``
     Optional. Port to connect to on mail server. (default: 465 if
     ``tls`` is smtps; 25 otherwise)
 
 ``tls``
     Optional. Method to enable TLS when connecting to mail server: starttls,
     smtps or none. (default: none)
 
 ``username``
     Optional. User name for authenticating with the SMTP server.
     (default: None)
 
 ``password``
     Optional. Password for authenticating with the SMTP server. If not
     specified, interactive sessions will prompt the user for a
     password; non-interactive sessions will fail. (default: None)
 
 ``local_hostname``
     Optional. The hostname that the sender can use to identify
     itself to the MTA.
 
 
 ``subpaths``
 ------------
 
 Subrepository source URLs can go stale if a remote server changes name
 or becomes temporarily unavailable. This section lets you define
 rewrite rules of the form::
 
     <pattern> = <replacement>
 
 where ``pattern`` is a regular expression matching a subrepository
 source URL and ``replacement`` is the replacement string used to
 rewrite it. Groups can be matched in ``pattern`` and referenced in
 ``replacements``. For instance::
 
     http://server/(.*)-hg/ = http://hg.server/\1/
 
 rewrites ``http://server/foo-hg/`` into ``http://hg.server/foo/``.
 
 Relative subrepository paths are first made absolute, and the
 rewrite rules are then applied on the full (absolute) path. If ``pattern``
 doesn't match the full path, an attempt is made to apply it on the
 relative path alone. The rules are applied in definition order.
 
 ``subrepos``
 ------------
 
 This section contains options that control the behavior of the
 subrepositories feature. See also :hg:`help subrepos`.
 
 Security note: auditing in Mercurial is known to be insufficient to
 prevent clone-time code execution with carefully constructed Git
 subrepos. It is unknown if a similar detect is present in Subversion
 subrepos. Both Git and Subversion subrepos are disabled by default
 out of security concerns. These subrepo types can be enabled using
 the respective options below.
 
 ``allowed``
     Whether subrepositories are allowed in the working directory.
 
     When false, commands involving subrepositories (like :hg:`update`)
     will fail for all subrepository types.
     (default: true)
 
 ``hg:allowed``
     Whether Mercurial subrepositories are allowed in the working
     directory. This option only has an effect if ``subrepos.allowed``
     is true.
     (default: true)
 
 ``git:allowed``
     Whether Git subrepositories are allowed in the working directory.
     This option only has an effect if ``subrepos.allowed`` is true.
 
     See the security note above before enabling Git subrepos.
     (default: false)
 
 ``svn:allowed``
     Whether Subversion subrepositories are allowed in the working
     directory. This option only has an effect if ``subrepos.allowed``
     is true.
 
     See the security note above before enabling Subversion subrepos.
     (default: false)
 
 ``templatealias``
 -----------------
 
 Alias definitions for templates. See :hg:`help templates` for details.
 
 ``templates``
 -------------
 
 Use the ``[templates]`` section to define template strings.
 See :hg:`help templates` for details.
 
 ``trusted``
 -----------
 
 Mercurial will not use the settings in the
 ``.hg/hgrc`` file from a repository if it doesn't belong to a trusted
 user or to a trusted group, as various hgrc features allow arbitrary
 commands to be run. This issue is often encountered when configuring
 hooks or extensions for shared repositories or servers. However,
 the web interface will use some safe settings from the ``[web]``
 section.
 
 This section specifies what users and groups are trusted. The
 current user is always trusted. To trust everybody, list a user or a
 group with name ``*``. These settings must be placed in an
 *already-trusted file* to take effect, such as ``$HOME/.hgrc`` of the
 user or service running Mercurial.
 
 ``users``
   Comma-separated list of trusted users.
 
 ``groups``
   Comma-separated list of trusted groups.
 
 
 ``ui``
 ------
 
 User interface controls.
 
 ``archivemeta``
     Whether to include the .hg_archival.txt file containing meta data
     (hashes for the repository base and for tip) in archives created
     by the :hg:`archive` command or downloaded via hgweb.
     (default: True)
 
 ``askusername``
     Whether to prompt for a username when committing. If True, and
     neither ``$HGUSER`` nor ``$EMAIL`` has been specified, then the user will
     be prompted to enter a username. If no username is entered, the
     default ``USER@HOST`` is used instead.
     (default: False)
 
 ``clonebundles``
     Whether the "clone bundles" feature is enabled.
 
     When enabled, :hg:`clone` may download and apply a server-advertised
     bundle file from a URL instead of using the normal exchange mechanism.
 
     This can likely result in faster and more reliable clones.
 
     (default: True)
 
 ``clonebundlefallback``
     Whether failure to apply an advertised "clone bundle" from a server
     should result in fallback to a regular clone.
 
     This is disabled by default because servers advertising "clone
     bundles" often do so to reduce server load. If advertised bundles
     start mass failing and clients automatically fall back to a regular
     clone, this would add significant and unexpected load to the server
     since the server is expecting clone operations to be offloaded to
     pre-generated bundles. Failing fast (the default behavior) ensures
     clients don't overwhelm the server when "clone bundle" application
     fails.
 
     (default: False)
 
 ``clonebundleprefers``
     Defines preferences for which "clone bundles" to use.
 
     Servers advertising "clone bundles" may advertise multiple available
     bundles. Each bundle may have different attributes, such as the bundle
     type and compression format. This option is used to prefer a particular
     bundle over another.
 
     The following keys are defined by Mercurial:
 
     BUNDLESPEC
        A bundle type specifier. These are strings passed to :hg:`bundle -t`.
        e.g. ``gzip-v2`` or ``bzip2-v1``.
 
     COMPRESSION
        The compression format of the bundle. e.g. ``gzip`` and ``bzip2``.
 
     Server operators may define custom keys.
 
     Example values: ``COMPRESSION=bzip2``,
     ``BUNDLESPEC=gzip-v2, COMPRESSION=gzip``.
 
     By default, the first bundle advertised by the server is used.
 
 ``color``
     When to colorize output. Possible value are Boolean ("yes" or "no"), or
     "debug", or "always". (default: "yes"). "yes" will use color whenever it
     seems possible. See :hg:`help color` for details.
 
 ``commitsubrepos``
     Whether to commit modified subrepositories when committing the
     parent repository. If False and one subrepository has uncommitted
     changes, abort the commit.
     (default: False)
 
 ``debug``
     Print debugging information. (default: False)
 
 ``editor``
     The editor to use during a commit. (default: ``$EDITOR`` or ``vi``)
 
 ``fallbackencoding``
     Encoding to try if it's not possible to decode the changelog using
     UTF-8. (default: ISO-8859-1)
 
 ``graphnodetemplate``
     (DEPRECATED) Use ``command-templates.graphnode`` instead.
 
 ``ignore``
     A file to read per-user ignore patterns from. This file should be
     in the same format as a repository-wide .hgignore file. Filenames
     are relative to the repository root. This option supports hook syntax,
     so if you want to specify multiple ignore files, you can do so by
     setting something like ``ignore.other = ~/.hgignore2``. For details
     of the ignore file format, see the ``hgignore(5)`` man page.
 
 ``interactive``
     Allow to prompt the user. (default: True)
 
 ``interface``
     Select the default interface for interactive features (default: text).
     Possible values are 'text' and 'curses'.
 
 ``interface.chunkselector``
     Select the interface for change recording (e.g. :hg:`commit -i`).
     Possible values are 'text' and 'curses'.
     This config overrides the interface specified by ui.interface.
 
 ``large-file-limit``
     Largest file size that gives no memory use warning.
     Possible values are integers or 0 to disable the check.
     Value is expressed in bytes by default, one can use standard units for
     convenience (e.g. 10MB, 0.1GB, etc) (default: 10MB)
 
 ``logtemplate``
     (DEPRECATED) Use ``command-templates.log`` instead.
 
 ``merge``
     The conflict resolution program to use during a manual merge.
     For more information on merge tools see :hg:`help merge-tools`.
     For configuring merge tools see the ``[merge-tools]`` section.
 
 ``mergemarkers``
     Sets the merge conflict marker label styling. The ``detailed`` style
     uses the ``command-templates.mergemarker`` setting to style the labels.
     The ``basic`` style just uses 'local' and 'other' as the marker label.
     One of ``basic`` or ``detailed``.
     (default: ``basic``)
 
 ``mergemarkertemplate``
     (DEPRECATED) Use ``command-templates.mergemarker`` instead.
 
 ``message-output``
     Where to write status and error messages. (default: ``stdio``)
 
     ``channel``
       Use separate channel for structured output. (Command-server only)
     ``stderr``
       Everything to stderr.
     ``stdio``
       Status to stdout, and error to stderr.
 
 ``origbackuppath``
     The path to a directory used to store generated .orig files. If the path is
     not a directory, one will be created.  If set, files stored in this
     directory have the same name as the original file and do not have a .orig
     suffix.
 
 ``paginate``
   Control the pagination of command output (default: True). See :hg:`help pager`
   for details.
 
 ``patch``
     An optional external tool that ``hg import`` and some extensions
     will use for applying patches. By default Mercurial uses an
     internal patch utility. The external tool must work as the common
     Unix ``patch`` program. In particular, it must accept a ``-p``
     argument to strip patch headers, a ``-d`` argument to specify the
     current directory, a file name to patch, and a patch file to take
     from stdin.
 
     It is possible to specify a patch tool together with extra
     arguments. For example, setting this option to ``patch --merge``
     will use the ``patch`` program with its 2-way merge option.
 
 ``portablefilenames``
     Check for portable filenames. Can be ``warn``, ``ignore`` or ``abort``.
     (default: ``warn``)
 
     ``warn``
       Print a warning message on POSIX platforms, if a file with a non-portable
       filename is added (e.g. a file with a name that can't be created on
       Windows because it contains reserved parts like ``AUX``, reserved
       characters like ``:``, or would cause a case collision with an existing
       file).
 
     ``ignore``
       Don't print a warning.
 
     ``abort``
       The command is aborted.
 
     ``true``
       Alias for ``warn``.
 
     ``false``
       Alias for ``ignore``.
 
     .. container:: windows
 
       On Windows, this configuration option is ignored and the command aborted.
 
 ``pre-merge-tool-output-template``
     (DEPRECATED) Use ``command-template.pre-merge-tool-output`` instead.
 
 ``quiet``
     Reduce the amount of output printed.
     (default: False)
 
 ``relative-paths``
     Prefer relative paths in the UI.
 
 ``remotecmd``
     Remote command to use for clone/push/pull operations.
     (default: ``hg``)
 
 ``report_untrusted``
     Warn if a ``.hg/hgrc`` file is ignored due to not being owned by a
     trusted user or group.
     (default: True)
 
 ``slash``
     (Deprecated. Use ``slashpath`` template filter instead.)
 
     Display paths using a slash (``/``) as the path separator. This
     only makes a difference on systems where the default path
     separator is not the slash character (e.g. Windows uses the
     backslash character (``\``)).
     (default: False)
 
 ``statuscopies``
     Display copies in the status command.
 
 ``ssh``
     Command to use for SSH connections. (default: ``ssh``)
 
 ``ssherrorhint``
     A hint shown to the user in the case of SSH error (e.g.
     ``Please see http://company/internalwiki/ssh.html``)
 
 ``strict``
     Require exact command names, instead of allowing unambiguous
     abbreviations. (default: False)
 
 ``style``
     Name of style to use for command output.
 
 ``supportcontact``
     A URL where users should report a Mercurial traceback. Use this if you are a
     large organisation with its own Mercurial deployment process and crash
     reports should be addressed to your internal support.
 
 ``textwidth``
     Maximum width of help text. A longer line generated by ``hg help`` or
     ``hg subcommand --help`` will be broken after white space to get this
     width or the terminal width, whichever comes first.
     A non-positive value will disable this and the terminal width will be
     used. (default: 78)
 
 ``timeout``
     The timeout used when a lock is held (in seconds), a negative value
     means no timeout. (default: 600)
 
 ``timeout.warn``
     Time (in seconds) before a warning is printed about held lock. A negative
     value means no warning. (default: 0)
 
 ``traceback``
     Mercurial always prints a traceback when an unknown exception
     occurs. Setting this to True will make Mercurial print a traceback
     on all exceptions, even those recognized by Mercurial (such as
     IOError or MemoryError). (default: False)
 
 ``tweakdefaults``
 
     By default Mercurial's behavior changes very little from release
     to release, but over time the recommended config settings
     shift. Enable this config to opt in to get automatic tweaks to
     Mercurial's behavior over time. This config setting will have no
     effect if ``HGPLAIN`` is set or ``HGPLAINEXCEPT`` is set and does
     not include ``tweakdefaults``. (default: False)
 
     It currently means::
 
       .. tweakdefaultsmarker
 
 ``username``
     The committer of a changeset created when running "commit".
     Typically a person's name and email address, e.g. ``Fred Widget
     <[e-mail]>``. Environment variables in the
     username are expanded.
 
     (default: ``$EMAIL`` or ``username@hostname``. If the username in
     hgrc is empty, e.g. if the system admin set ``username =`` in the
     system hgrc, it has to be specified manually or in a different
     hgrc file)
 
 ``verbose``
     Increase the amount of output printed. (default: False)
 
 
 ``usage``
 ---------
 
 ``repository-role``
     What this repository is used for.
 
     This is used to adjust behavior and performance to best fit the repository purpose.
 
     Currently recognised values are:
     - default: an all purpose repository
 
+``resources``
+    How aggressive Mercurial can be with resource usage:
+
+    Currently recognised values are:
+    - default: the default value currently is equivalent to medium,
+    - high:    allows for higher cpu, memory and disk-space usage to improve
+               performance of some operations.
+    - medium:  aims at a moderate resource usage,
+    - low:     reduces resources usage when possible, decreasing overall
+      performance.
+
+    For finer configuration, see also `usage.resources.cpu`,
+    `usage.resources.disk` and `usage.resources.memory`.
+
+``resources.cpu``
+    How aggressive Mercurial can be in terms of cpu usage:
+
+    Currently recognised values are:
+    - default: the default value, inherits the value from `usage.resources`,
+    - high:    allows for more aggressive cpu usage, improving storage quality and
+               the performance of some operations at the expense of machine load
+    - medium:  aims at a moderate cpu usage,
+    - low:     reduces cpu usage when possible, potentially at the expense of
+               slower operations, increased storage and exchange payload.
+
+``resources.disk``
+    How aggressive Mercurial can be in terms of disk usage:
+
+    Currently recognised values are:
+    - default: the default value, inherits the value from `usage.resources`,
+    - high:    allows for more disk space usage where it can improve performance,
+    - medium:  aims at a moderate disk usage,
+    - low:     reduces disk usage when possible, decreasing performance in some
+               occasion.
+
+``resources.memory``
+    How aggressive Mercurial can be in terms of memory usage:
+
+    Currently recognised values are:
+    - default: the default value, inherits the value from `usage.resources`,
+    - high:    allows for more aggressive memory usage to improve overall
+               performance,
+    - medium:  aims at a moderate memory usage,
+    - low:     reduces memory usage when possible at the cost of overall
+               performance.
+
 
 ``command-templates``
 ---------------------
 
 Templates used for customizing the output of commands.
 
 ``graphnode``
     The template used to print changeset nodes in an ASCII revision graph.
     (default: ``{graphnode}``)
 
 ``log``
     Template string for commands that print changesets.
 
 ``mergemarker``
     The template used to print the commit description next to each conflict
     marker during merge conflicts. See :hg:`help templates` for the template
     format.
 
     Defaults to showing the hash, tags, branches, bookmarks, author, and
     the first line of the commit description.
 
     If you use non-ASCII characters in names for tags, branches, bookmarks,
     authors, and/or commit descriptions, you must pay attention to encodings of
     managed files. At template expansion, non-ASCII characters use the encoding
     specified by the ``--encoding`` global option, ``HGENCODING`` or other
     environment variables that govern your locale. If the encoding of the merge
     markers is different from the encoding of the merged files,
     serious problems may occur.
 
     Can be overridden per-merge-tool, see the ``[merge-tools]`` section.
 
 ``oneline-summary``
     A template used by `hg rebase` and other commands for showing a one-line
     summary of a commit. If the template configured here is longer than one
     line, then only the first line is used.
 
     The template can be overridden per command by defining a template in
     `oneline-summary.<command>`, where `<command>` can be e.g. "rebase".
 
 ``pre-merge-tool-output``
     A template that is printed before executing an external merge tool. This can
     be used to print out additional context that might be useful to have during
     the conflict resolution, such as the description of the various commits
     involved or bookmarks/tags.
 
     Additional information is available in the ``local`, ``base``, and ``other``
     dicts. For example: ``{local.label}``, ``{base.name}``, or
     ``{other.islink}``.
 
 
 ``web``
 -------
 
 Web interface configuration. The settings in this section apply to
 both the builtin webserver (started by :hg:`serve`) and the script you
 run through a webserver (``hgweb.cgi`` and the derivatives for FastCGI
 and WSGI).
 
 The Mercurial webserver does no authentication (it does not prompt for
 usernames and passwords to validate *who* users are), but it does do
 authorization (it grants or denies access for *authenticated users*
 based on settings in this section). You must either configure your
 webserver to do authentication for you, or disable the authorization
 checks.
 
 For a quick setup in a trusted environment, e.g., a private LAN, where
 you want it to accept pushes from anybody, you can use the following
 command line::
 
     $ hg --config web.allow-push=* --config web.push_ssl=False serve
 
 Note that this will allow anybody to push anything to the server and
 that this should not be used for public servers.
 
 The full set of options is:
 
 ``accesslog``
     Where to output the access log. (default: stdout)
 
 ``address``
     Interface address to bind to. (default: all)
 
 ``allow-archive``
     List of archive format (bz2, gz, zip) allowed for downloading.
     (default: empty)
 
 ``allowbz2``
     (DEPRECATED) Whether to allow .tar.bz2 downloading of repository
     revisions.
     (default: False)
 
 ``allowgz``
     (DEPRECATED) Whether to allow .tar.gz downloading of repository
     revisions.
     (default: False)
 
 ``allow-pull``
     Whether to allow pulling from the repository. (default: True)
 
 ``allow-push``
     Whether to allow pushing to the repository. If empty or not set,
     pushing is not allowed. If the special value ``*``, any remote
     user can push, including unauthenticated users. Otherwise, the
     remote user must have been authenticated, and the authenticated
     user name must be present in this list. The contents of the
     allow-push list are examined after the deny_push list.
 
 ``allow_read``
     If the user has not already been denied repository access due to
     the contents of deny_read, this list determines whether to grant
     repository access to the user. If this list is not empty, and the
     user is unauthenticated or not present in the list, then access is
     denied for the user. If the list is empty or not set, then access
     is permitted to all users by default. Setting allow_read to the
     special value ``*`` is equivalent to it not being set (i.e. access
     is permitted to all users). The contents of the allow_read list are
     examined after the deny_read list.
 
 ``allowzip``
     (DEPRECATED) Whether to allow .zip downloading of repository
     revisions. This feature creates temporary files.
     (default: False)
 
 ``archivesubrepos``
     Whether to recurse into subrepositories when archiving.
     (default: False)
 
 ``baseurl``
     Base URL to use when publishing URLs in other locations, so
     third-party tools like email notification hooks can construct
     URLs. Example: ``http://hgserver/repos/``.
 
 ``cacerts``
     Path to file containing a list of PEM encoded certificate
     authority certificates. Environment variables and ``~user``
     constructs are expanded in the filename. If specified on the
     client, then it will verify the identity of remote HTTPS servers
     with these certificates.
 
     To disable SSL verification temporarily, specify ``--insecure`` from
     command line.
 
     You can use OpenSSL's CA certificate file if your platform has
     one. On most Linux systems this will be
     ``/etc/ssl/certs/ca-certificates.crt``. Otherwise you will have to
     generate this file manually. The form must be as follows::
 
         -----BEGIN CERTIFICATE-----
         ... (certificate in base64 PEM encoding) ...
         -----END CERTIFICATE-----
         -----BEGIN CERTIFICATE-----
         ... (certificate in base64 PEM encoding) ...
         -----END CERTIFICATE-----
 
 ``cache``
     Whether to support caching in hgweb. (default: True)
 
 ``certificate``
     Certificate to use when running :hg:`serve`.
 
 ``collapse``
     With ``descend`` enabled, repositories in subdirectories are shown at
     a single level alongside repositories in the current path. With
     ``collapse`` also enabled, repositories residing at a deeper level than
     the current path are grouped behind navigable directory entries that
     lead to the locations of these repositories. In effect, this setting
     collapses each collection of repositories found within a subdirectory
     into a single entry for that subdirectory. (default: False)
 
 ``comparisoncontext``
     Number of lines of context to show in side-by-side file comparison. If
     negative or the value ``full``, whole files are shown. (default: 5)
 
     This setting can be overridden by a ``context`` request parameter to the
     ``comparison`` command, taking the same values.
 
 ``contact``
     Name or email address of the person in charge of the repository.
     (default: ui.username or ``$EMAIL`` or "unknown" if unset or empty)
 
 ``csp``
     Send a ``Content-Security-Policy`` HTTP header with this value.
 
     The value may contain a special string ``%nonce%``, which will be replaced
     by a randomly-generated one-time use value. If the value contains
     ``%nonce%``, ``web.cache`` will be disabled, as caching undermines the
     one-time property of the nonce. This nonce will also be inserted into
     ``<script>`` elements containing inline JavaScript.
 
     Note: lots of HTML content sent by the server is derived from repository
     data. Please consider the potential for malicious repository data to
     "inject" itself into generated HTML content as part of your security
     threat model.
 
 ``deny_push``
     Whether to deny pushing to the repository. If empty or not set,
     push is not denied. If the special value ``*``, all remote users are
     denied push. Otherwise, unauthenticated users are all denied, and
     any authenticated user name present in this list is also denied. The
     contents of the deny_push list are examined before the allow-push list.
 
 ``deny_read``
     Whether to deny reading/viewing of the repository. If this list is
     not empty, unauthenticated users are all denied, and any
     authenticated user name present in this list is also denied access to
     the repository. If set to the special value ``*``, all remote users
     are denied access (rarely needed ;). If deny_read is empty or not set,
     the determination of repository access depends on the presence and
     content of the allow_read list (see description). If both
     deny_read and allow_read are empty or not set, then access is
     permitted to all users by default. If the repository is being
     served via hgwebdir, denied users will not be able to see it in
     the list of repositories. The contents of the deny_read list have
     priority over (are examined before) the contents of the allow_read
     list.
 
 ``descend``
     hgwebdir indexes will not descend into subdirectories. Only repositories
     directly in the current path will be shown (other repositories are still
     available from the index corresponding to their containing path).
 
 ``description``
     Textual description of the repository's purpose or contents.
     (default: "unknown")
 
 ``encoding``
     Character encoding name. (default: the current locale charset)
     Example: "UTF-8".
 
 ``errorlog``
     Where to output the error log. (default: stderr)
 
 ``guessmime``
     Control MIME types for raw download of file content.
     Set to True to let hgweb guess the content type from the file
     extension. This will serve HTML files as ``text/html`` and might
     allow cross-site scripting attacks when serving untrusted
     repositories. (default: False)
 
 ``hidden``
     Whether to hide the repository in the hgwebdir index.
     (default: False)
 
 ``ipv6``
     Whether to use IPv6. (default: False)
 
 ``labels``
     List of string *labels* associated with the repository.
 
     Labels are exposed as a template keyword and can be used to customize
     output. e.g. the ``index`` template can group or filter repositories
     by labels and the ``summary`` template can display additional content
     if a specific label is present.
 
 ``logoimg``
     File name of the logo image that some templates display on each page.
     The file name is relative to ``staticurl``. That is, the full path to
     the logo image is "staticurl/logoimg".
     If unset, ``hglogo.png`` will be used.
 
 ``logourl``
     Base URL to use for logos. If unset, ``https://mercurial-scm.org/``
     will be used.
 
 ``maxchanges``
     Maximum number of changes to list on the changelog. (default: 10)
 
 ``maxfiles``
     Maximum number of files to list per changeset. (default: 10)
 
 ``maxshortchanges``
     Maximum number of changes to list on the shortlog, graph or filelog
     pages. (default: 60)
 
 ``name``
     Repository name to use in the web interface.
     (default: current working directory)
 
 ``port``
     Port to listen on. (default: 8000)
 
 ``prefix``
     Prefix path to serve from. (default: '' (server root))
 
 ``push_ssl``
     Whether to require that inbound pushes be transported over SSL to
     prevent password sniffing. (default: True)
 
 ``refreshinterval``
     How frequently directory listings re-scan the filesystem for new
     repositories, in seconds. This is relevant when wildcards are used
     to define paths. Depending on how much filesystem traversal is
     required, refreshing may negatively impact performance.
 
     Values less than or equal to 0 always refresh.
     (default: 20)
 
 ``server-header``
     Value for HTTP ``Server`` response header.
 
 ``static``
     Directory where static files are served from.
 
 ``staticurl``
     Base URL to use for static files. If unset, static files (e.g. the
     hgicon.png favicon) will be served by the CGI script itself. Use
     this setting to serve them directly with the HTTP server.
     Example: ``http://hgserver/static/``.
 
 ``stripes``
     How many lines a "zebra stripe" should span in multi-line output.
     Set to 0 to disable. (default: 1)
 
 ``style``
     Which template map style to use. The available options are the names of
     subdirectories in the HTML templates path. (default: ``paper``)
     Example: ``monoblue``.
 
 ``templates``
     Where to find the HTML templates. The default path to the HTML templates
     can be obtained from ``hg debuginstall``.
 
 ``websub``
 ----------
 
 Web substitution filter definition. You can use this section to
 define a set of regular expression substitution patterns which
 let you automatically modify the hgweb server output.
 
 The default hgweb templates only apply these substitution patterns
 on the revision description fields. You can apply them anywhere
 you want when you create your own templates by adding calls to the
 "websub" filter (usually after calling the "escape" filter).
 
 This can be used, for example, to convert issue references to links
 to your issue tracker, or to convert "markdown-like" syntax into
 HTML (see the examples below).
 
 Each entry in this section names a substitution filter.
 The value of each entry defines the substitution expression itself.
 The websub expressions follow the old interhg extension syntax,
 which in turn imitates the Unix sed replacement syntax::
 
     patternname = s/SEARCH_REGEX/REPLACE_EXPRESSION/[i]
 
 You can use any separator other than "/". The final "i" is optional
 and indicates that the search must be case insensitive.
 
 Examples::
 
     [websub]
     issues = s|issue(\d+)|<a href="http://bts.example.org/issue\1">issue\1</a>|i
     italic = s/\b_(\S+)_\b/<i>\1<\/i>/
     bold = s/\*\b(\S+)\b\*/<b>\1<\/b>/
 
 ``worker``
 ----------
 
 Parallel master/worker configuration. We currently perform working
 directory updates in parallel on Unix-like systems, which greatly
 helps performance.
 
 ``enabled``
     Whether to enable workers code to be used.
     (default: true)
 
 ``numcpus``
     Number of CPUs to use for parallel operations. A zero or
     negative value is treated as ``use the default``.
     (default: 4 or the number of CPUs on the system, whichever is larger)
 
 ``backgroundclose``
     Whether to enable closing file handles on background threads during certain
     operations. Some platforms aren't very efficient at closing file
     handles that have been written or appended to. By performing file closing
     on background threads, file write rate can increase substantially.
     (default: true on Windows, false elsewhere)
 
 ``backgroundcloseminfilecount``
     Minimum number of files required to trigger background file closing.
     Operations not writing this many files won't start background close
     threads.
     (default: 2048)
 
 ``backgroundclosemaxqueue``
     The maximum number of opened file handles waiting to be closed in the
     background. This option only has an effect if ``backgroundclose`` is
     enabled.
     (default: 384)
 
 ``backgroundclosethreadcount``
     Number of threads to process background file closes. Only relevant if
     ``backgroundclose`` is enabled.
     (default: 4)

mercurial/scmutil.py

@@ -1,2327 +1,2358 b''
 # scmutil.py - Mercurial core utility functions
 #
 #  Copyright Olivia Mackall <[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.
 
 
 import binascii
 import errno
 import glob
 import os
 import posixpath
 import re
 import subprocess
 import weakref
 
 from .i18n import _
 from .node import (
     bin,
     hex,
     nullrev,
     short,
     wdirrev,
 )
 from .thirdparty import attr
 from . import (
     copies as copiesmod,
     encoding,
     error,
     match as matchmod,
     obsolete,
     obsutil,
     pathutil,
     phases,
     policy,
     pycompat,
     requirements as requirementsmod,
     revsetlang,
     similar,
     smartset,
     url,
     util,
     vfs,
 )
 
 from .utils import (
     hashutil,
     procutil,
     stringutil,
 )
 
 if pycompat.iswindows:
     from . import scmwindows as scmplatform
 else:
     from . import scmposix as scmplatform
 
 parsers = policy.importmod('parsers')
 rustrevlog = policy.importrust('revlog')
 
 termsize = scmplatform.termsize
 
 
 @attr.s(slots=True, repr=False)
 class status:
     """Struct with a list of files per status.
 
     The 'deleted', 'unknown' and 'ignored' properties are only
     relevant to the working copy.
     """
 
     modified = attr.ib(default=attr.Factory(list))
     added = attr.ib(default=attr.Factory(list))
     removed = attr.ib(default=attr.Factory(list))
     deleted = attr.ib(default=attr.Factory(list))
     unknown = attr.ib(default=attr.Factory(list))
     ignored = attr.ib(default=attr.Factory(list))
     clean = attr.ib(default=attr.Factory(list))
 
     def __iter__(self):
         yield self.modified
         yield self.added
         yield self.removed
         yield self.deleted
         yield self.unknown
         yield self.ignored
         yield self.clean
 
     def __repr__(self):
         return (
             r'<status modified=%s, added=%s, removed=%s, deleted=%s, '
             r'unknown=%s, ignored=%s, clean=%s>'
         ) % tuple(pycompat.sysstr(stringutil.pprint(v)) for v in self)
 
 
 def itersubrepos(ctx1, ctx2):
     """find subrepos in ctx1 or ctx2"""
     # Create a (subpath, ctx) mapping where we prefer subpaths from
     # ctx1. The subpaths from ctx2 are important when the .hgsub file
     # has been modified (in ctx2) but not yet committed (in ctx1).
     subpaths = dict.fromkeys(ctx2.substate, ctx2)
     subpaths.update(dict.fromkeys(ctx1.substate, ctx1))
 
     missing = set()
 
     for subpath in ctx2.substate:
         if subpath not in ctx1.substate:
             del subpaths[subpath]
             missing.add(subpath)
 
     for subpath, ctx in sorted(subpaths.items()):
         yield subpath, ctx.sub(subpath)
 
     # Yield an empty subrepo based on ctx1 for anything only in ctx2.  That way,
     # status and diff will have an accurate result when it does
     # 'sub.{status|diff}(rev2)'.  Otherwise, the ctx2 subrepo is compared
     # against itself.
     for subpath in missing:
         yield subpath, ctx2.nullsub(subpath, ctx1)
 
 
 def nochangesfound(ui, repo, excluded=None):
     """Report no changes for push/pull, excluded is None or a list of
     nodes excluded from the push/pull.
     """
     secretlist = []
     if excluded:
         for n in excluded:
             ctx = repo[n]
             if ctx.phase() >= phases.secret and not ctx.extinct():
                 secretlist.append(n)
 
     if secretlist:
         ui.status(
             _(b"no changes found (ignored %d secret changesets)\n")
             % len(secretlist)
         )
     else:
         ui.status(_(b"no changes found\n"))
 
 
 def callcatch(ui, func):
     """call func() with global exception handling
 
     return func() if no exception happens. otherwise do some error handling
     and return an exit code accordingly. does not handle all exceptions.
     """
     coarse_exit_code = -1
     detailed_exit_code = -1
     try:
         try:
             return func()
         except:  # re-raises
             ui.traceback()
             raise
     # Global exception handling, alphabetically
     # Mercurial-specific first, followed by built-in and library exceptions
     except error.LockHeld as inst:
         detailed_exit_code = 20
         if inst.errno == errno.ETIMEDOUT:
             reason = _(b'timed out waiting for lock held by %r') % (
                 pycompat.bytestr(inst.locker)
             )
         else:
             reason = _(b'lock held by %r') % inst.locker
         ui.error(
             _(b"abort: %s: %s\n")
             % (inst.desc or stringutil.forcebytestr(inst.filename), reason)
         )
         if not inst.locker:
             ui.error(_(b"(lock might be very busy)\n"))
     except error.LockUnavailable as inst:
         detailed_exit_code = 20
         ui.error(
             _(b"abort: could not lock %s: %s\n")
             % (
                 inst.desc or stringutil.forcebytestr(inst.filename),
                 encoding.strtolocal(inst.strerror),
             )
         )
     except error.RepoError as inst:
         if isinstance(inst, error.RepoLookupError):
             detailed_exit_code = 10
         ui.error(_(b"abort: %s\n") % inst)
         if inst.hint:
             ui.error(_(b"(%s)\n") % inst.hint)
     except error.ResponseError as inst:
         ui.error(_(b"abort: %s") % inst.args[0])
         msg = inst.args[1]
         if isinstance(msg, type(u'')):
             msg = pycompat.sysbytes(msg)
         if msg is None:
             ui.error(b"\n")
         elif not isinstance(msg, bytes):
             ui.error(b" %r\n" % (msg,))
         elif not msg:
             ui.error(_(b" empty string\n"))
         else:
             ui.error(b"\n%r\n" % pycompat.bytestr(stringutil.ellipsis(msg)))
     except error.CensoredNodeError as inst:
         ui.error(_(b"abort: file censored %s\n") % inst)
     except error.WdirUnsupported:
         ui.error(_(b"abort: working directory revision cannot be specified\n"))
     except error.Error as inst:
         if inst.detailed_exit_code is not None:
             detailed_exit_code = inst.detailed_exit_code
         if inst.coarse_exit_code is not None:
             coarse_exit_code = inst.coarse_exit_code
         ui.error(inst.format())
     except error.WorkerError as inst:
         # Don't print a message -- the worker already should have
         return inst.status_code
     except ImportError as inst:
         ui.error(_(b"abort: %s\n") % stringutil.forcebytestr(inst))
         m = stringutil.forcebytestr(inst).split()[-1]
         if m in b"mpatch bdiff".split():
             ui.error(_(b"(did you forget to compile extensions?)\n"))
         elif m in b"zlib".split():
             ui.error(_(b"(is your Python install correct?)\n"))
     except util.urlerr.httperror as inst:
         detailed_exit_code = 100
         ui.error(_(b"abort: %s\n") % stringutil.forcebytestr(inst))
     except util.urlerr.urlerror as inst:
         detailed_exit_code = 100
         try:  # usually it is in the form (errno, strerror)
             reason = inst.reason.args[1]
         except (AttributeError, IndexError):
             # it might be anything, for example a string
             reason = inst.reason
         if isinstance(reason, str):
             # SSLError of Python 2.7.9 contains a unicode
             reason = encoding.unitolocal(reason)
         ui.error(_(b"abort: error: %s\n") % stringutil.forcebytestr(reason))
     except (IOError, OSError) as inst:
         if hasattr(inst, "args") and inst.args and inst.args[0] == errno.EPIPE:
             pass
         elif getattr(inst, "strerror", None):  # common IOError or OSError
             if getattr(inst, "filename", None) is not None:
                 ui.error(
                     _(b"abort: %s: '%s'\n")
                     % (
                         encoding.strtolocal(inst.strerror),
                         stringutil.forcebytestr(inst.filename),
                     )
                 )
             else:
                 ui.error(_(b"abort: %s\n") % encoding.strtolocal(inst.strerror))
         else:  # suspicious IOError
             raise
     except MemoryError:
         ui.error(_(b"abort: out of memory\n"))
     except SystemExit as inst:
         # Commands shouldn't sys.exit directly, but give a return code.
         # Just in case catch this and and pass exit code to caller.
         detailed_exit_code = 254
         coarse_exit_code = inst.code
 
     if ui.configbool(b'ui', b'detailed-exit-code'):
         return detailed_exit_code
     else:
         return coarse_exit_code
 
 
 def checknewlabel(repo, lbl, kind):
     # Do not use the "kind" parameter in ui output.
     # It makes strings difficult to translate.
     if lbl in [b'tip', b'.', b'null']:
         raise error.InputError(_(b"the name '%s' is reserved") % lbl)
     for c in (b':', b'\0', b'\n', b'\r'):
         if c in lbl:
             raise error.InputError(
                 _(b"%r cannot be used in a name") % pycompat.bytestr(c)
             )
     try:
         int(lbl)
         if b'_' in lbl:
             # If label contains underscores, Python might consider it an
             # integer (with "_" as visual separators), but we do not.
             # See PEP 515 - Underscores in Numeric Literals.
             raise ValueError
         raise error.InputError(_(b"cannot use an integer as a name"))
     except ValueError:
         pass
     if lbl.strip() != lbl:
         raise error.InputError(
             _(b"leading or trailing whitespace in name %r") % lbl
         )
 
 
 def checkfilename(f):
     '''Check that the filename f is an acceptable filename for a tracked file'''
     if b'\r' in f or b'\n' in f:
         raise error.InputError(
             _(b"'\\n' and '\\r' disallowed in filenames: %r")
             % pycompat.bytestr(f)
         )
 
 
 def checkportable(ui, f):
     '''Check if filename f is portable and warn or abort depending on config'''
     checkfilename(f)
     abort, warn = checkportabilityalert(ui)
     if abort or warn:
         msg = util.checkwinfilename(f)
         if msg:
             msg = b"%s: %s" % (msg, procutil.shellquote(f))
             if abort:
                 raise error.InputError(msg)
             ui.warn(_(b"warning: %s\n") % msg)
 
 
 def checkportabilityalert(ui):
     """check if the user's config requests nothing, a warning, or abort for
     non-portable filenames"""
     val = ui.config(b'ui', b'portablefilenames')
     lval = val.lower()
     bval = stringutil.parsebool(val)
     abort = pycompat.iswindows or lval == b'abort'
     warn = bval or lval == b'warn'
     if bval is None and not (warn or abort or lval == b'ignore'):
         raise error.ConfigError(
             _(b"ui.portablefilenames value is invalid ('%s')") % val
         )
     return abort, warn
 
 
 class casecollisionauditor:
     def __init__(self, ui, abort, dirstate):
         self._ui = ui
         self._abort = abort
         allfiles = b'\0'.join(dirstate)
         self._loweredfiles = set(encoding.lower(allfiles).split(b'\0'))
         self._dirstate = dirstate
         # The purpose of _newfiles is so that we don't complain about
         # case collisions if someone were to call this object with the
         # same filename twice.
         self._newfiles = set()
 
     def __call__(self, f):
         if f in self._newfiles:
             return
         fl = encoding.lower(f)
         if fl in self._loweredfiles and f not in self._dirstate:
             msg = _(b'possible case-folding collision for %s') % f
             if self._abort:
                 raise error.StateError(msg)
             self._ui.warn(_(b"warning: %s\n") % msg)
         self._loweredfiles.add(fl)
         self._newfiles.add(f)
 
 
 def filteredhash(repo, maxrev, needobsolete=False):
     """build hash of filtered revisions in the current repoview.
 
     Multiple caches perform up-to-date validation by checking that the
     tiprev and tipnode stored in the cache file match the current repository.
     However, this is not sufficient for validating repoviews because the set
     of revisions in the view may change without the repository tiprev and
     tipnode changing.
 
     This function hashes all the revs filtered from the view (and, optionally,
     all obsolete revs) up to maxrev and returns that SHA-1 digest.
     """
     cl = repo.changelog
     if needobsolete:
         obsrevs = obsolete.getrevs(repo, b'obsolete')
         if not cl.filteredrevs and not obsrevs:
             return None
         key = (maxrev, hash(cl.filteredrevs), hash(obsrevs))
     else:
         if not cl.filteredrevs:
             return None
         key = maxrev
         obsrevs = frozenset()
 
     result = cl._filteredrevs_hashcache.get(key)
     if not result:
         revs = sorted(r for r in cl.filteredrevs | obsrevs if r <= maxrev)
         if revs:
             s = hashutil.sha1()
             for rev in revs:
                 s.update(b'%d;' % rev)
             result = s.digest()
             cl._filteredrevs_hashcache[key] = result
     return result
 
 
 def walkrepos(path, followsym=False, seen_dirs=None, recurse=False):
     """yield every hg repository under path, always recursively.
     The recurse flag will only control recursion into repo working dirs"""
 
     def errhandler(err):
         if err.filename == path:
             raise err
 
     samestat = getattr(os.path, 'samestat', None)
     if followsym and samestat is not None:
 
         def adddir(dirlst, dirname):
             dirstat = os.stat(dirname)
             match = any(samestat(dirstat, lstdirstat) for lstdirstat in dirlst)
             if not match:
                 dirlst.append(dirstat)
             return not match
 
     else:
         followsym = False
 
     if (seen_dirs is None) and followsym:
         seen_dirs = []
         adddir(seen_dirs, path)
     for root, dirs, files in os.walk(path, topdown=True, onerror=errhandler):
         dirs.sort()
         if b'.hg' in dirs:
             yield root  # found a repository
             qroot = os.path.join(root, b'.hg', b'patches')
             if os.path.isdir(os.path.join(qroot, b'.hg')):
                 yield qroot  # we have a patch queue repo here
             if recurse:
                 # avoid recursing inside the .hg directory
                 dirs.remove(b'.hg')
             else:
                 dirs[:] = []  # don't descend further
         elif followsym:
             newdirs = []
             for d in dirs:
                 fname = os.path.join(root, d)
                 if adddir(seen_dirs, fname):
                     if os.path.islink(fname):
                         for hgname in walkrepos(fname, True, seen_dirs):
                             yield hgname
                     else:
                         newdirs.append(d)
             dirs[:] = newdirs
 
 
 def binnode(ctx):
     """Return binary node id for a given basectx"""
     node = ctx.node()
     if node is None:
         return ctx.repo().nodeconstants.wdirid
     return node
 
 
 def intrev(ctx):
     """Return integer for a given basectx that can be used in comparison or
     arithmetic operation"""
     rev = ctx.rev()
     if rev is None:
         return wdirrev
     return rev
 
 
 def formatchangeid(ctx):
     """Format changectx as '{rev}:{node|formatnode}', which is the default
     template provided by logcmdutil.changesettemplater"""
     repo = ctx.repo()
     return formatrevnode(repo.ui, intrev(ctx), binnode(ctx))
 
 
 def formatrevnode(ui, rev, node):
     """Format given revision and node depending on the current verbosity"""
     if ui.debugflag:
         hexfunc = hex
     else:
         hexfunc = short
     return b'%d:%s' % (rev, hexfunc(node))
 
 
 def resolvehexnodeidprefix(repo, prefix):
     if prefix.startswith(b'x'):
         prefix = prefix[1:]
     try:
         # Uses unfiltered repo because it's faster when prefix is ambiguous/
         # This matches the shortesthexnodeidprefix() function below.
         node = repo.unfiltered().changelog._partialmatch(prefix)
     except error.AmbiguousPrefixLookupError:
         revset = repo.ui.config(
             b'experimental', b'revisions.disambiguatewithin'
         )
         if revset:
             # Clear config to avoid infinite recursion
             configoverrides = {
                 (b'experimental', b'revisions.disambiguatewithin'): None
             }
             with repo.ui.configoverride(configoverrides):
                 revs = repo.anyrevs([revset], user=True)
                 matches = []
                 for rev in revs:
                     node = repo.changelog.node(rev)
                     if hex(node).startswith(prefix):
                         matches.append(node)
                 if len(matches) == 1:
                     return matches[0]
         raise
     if node is None:
         return
     repo.changelog.rev(node)  # make sure node isn't filtered
     return node
 
 
 def mayberevnum(repo, prefix):
     """Checks if the given prefix may be mistaken for a revision number"""
     try:
         i = int(prefix)
         # if we are a pure int, then starting with zero will not be
         # confused as a rev; or, obviously, if the int is larger
         # than the value of the tip rev. We still need to disambiguate if
         # prefix == '0', since that *is* a valid revnum.
         if (prefix != b'0' and prefix[0:1] == b'0') or i >= len(repo):
             return False
         return True
     except ValueError:
         return False
 
 
 def shortesthexnodeidprefix(repo, node, minlength=1, cache=None):
     """Find the shortest unambiguous prefix that matches hexnode.
 
     If "cache" is not None, it must be a dictionary that can be used for
     caching between calls to this method.
     """
     # _partialmatch() of filtered changelog could take O(len(repo)) time,
     # which would be unacceptably slow. so we look for hash collision in
     # unfiltered space, which means some hashes may be slightly longer.
 
     minlength = max(minlength, 1)
 
     def disambiguate(prefix):
         """Disambiguate against revnums."""
         if repo.ui.configbool(b'experimental', b'revisions.prefixhexnode'):
             if mayberevnum(repo, prefix):
                 return b'x' + prefix
             else:
                 return prefix
 
         hexnode = hex(node)
         for length in range(len(prefix), len(hexnode) + 1):
             prefix = hexnode[:length]
             if not mayberevnum(repo, prefix):
                 return prefix
 
     cl = repo.unfiltered().changelog
     revset = repo.ui.config(b'experimental', b'revisions.disambiguatewithin')
     if revset:
         revs = None
         if cache is not None:
             revs = cache.get(b'disambiguationrevset')
         if revs is None:
             revs = repo.anyrevs([revset], user=True)
             if cache is not None:
                 cache[b'disambiguationrevset'] = revs
         if cl.rev(node) in revs:
             hexnode = hex(node)
             nodetree = None
             if cache is not None:
                 nodetree = cache.get(b'disambiguationnodetree')
             is_invalidated = getattr(nodetree, 'is_invalidated', lambda: False)
             if is_invalidated():
                 nodetree = None
             if not nodetree:
                 if hasattr(parsers, 'nodetree') and isinstance(
                     cl.index, parsers.index
                 ):
                     index = cl.index
                     nodetree = parsers.nodetree(index, len(revs))
             elif getattr(cl.index, 'is_rust', False):
                 nodetree = rustrevlog.NodeTree(cl.index)
 
             if nodetree is not None:
                 for r in revs:
                     nodetree.insert(r)
                 if cache is not None:
                     cache[b'disambiguationnodetree'] = nodetree
                 length = max(nodetree.shortest(node), minlength)
                 prefix = hexnode[:length]
                 return disambiguate(prefix)
             for length in range(minlength, len(hexnode) + 1):
                 matches = []
                 prefix = hexnode[:length]
                 for rev in revs:
                     otherhexnode = repo[rev].hex()
                     if prefix == otherhexnode[:length]:
                         matches.append(otherhexnode)
                 if len(matches) == 1:
                     return disambiguate(prefix)
 
     try:
         return disambiguate(cl.shortest(node, minlength))
     except error.LookupError:
         raise error.RepoLookupError()
 
 
 def isrevsymbol(repo, symbol):
     """Checks if a symbol exists in the repo.
 
     See revsymbol() for details. Raises error.AmbiguousPrefixLookupError if the
     symbol is an ambiguous nodeid prefix.
     """
     try:
         revsymbol(repo, symbol)
         return True
     except error.RepoLookupError:
         return False
 
 
 def revsymbol(repo, symbol):
     """Returns a context given a single revision symbol (as string).
 
     This is similar to revsingle(), but accepts only a single revision symbol,
     i.e. things like ".", "tip", "1234", "deadbeef", "my-bookmark" work, but
     not "max(public())".
     """
     if not isinstance(symbol, bytes):
         msg = (
             b"symbol (%s of type %s) was not a string, did you mean "
             b"repo[symbol]?" % (symbol, type(symbol))
         )
         raise error.ProgrammingError(msg)
     try:
         if symbol in (b'.', b'tip', b'null'):
             return repo[symbol]
 
         try:
             r = int(symbol)
             if b'%d' % r != symbol:
                 raise ValueError
             l = len(repo.changelog)
             if r < 0:
                 r += l
             if r < 0 or r >= l and r != wdirrev:
                 raise ValueError
             return repo[r]
         except error.FilteredIndexError:
             raise
         except (ValueError, OverflowError, IndexError):
             pass
 
         if len(symbol) == 2 * repo.nodeconstants.nodelen:
             try:
                 node = bin(symbol)
                 rev = repo.changelog.rev(node)
                 return repo[rev]
             except error.FilteredLookupError:
                 raise
             except (binascii.Error, LookupError):
                 pass
 
         # look up bookmarks through the name interface
         try:
             node = repo.names.singlenode(repo, symbol)
             rev = repo.changelog.rev(node)
             return repo[rev]
         except KeyError:
             pass
 
         node = resolvehexnodeidprefix(repo, symbol)
         if node is not None:
             rev = repo.changelog.rev(node)
             return repo[rev]
 
         raise error.RepoLookupError(_(b"unknown revision '%s'") % symbol)
 
     except error.WdirUnsupported:
         return repo[None]
     except (
         error.FilteredIndexError,
         error.FilteredLookupError,
         error.FilteredRepoLookupError,
     ):
         raise _filterederror(repo, symbol)
 
 
 def _filterederror(repo, changeid):
     """build an exception to be raised about a filtered changeid
 
     This is extracted in a function to help extensions (eg: evolve) to
     experiment with various message variants."""
     if repo.filtername.startswith(b'visible'):
 
         # Check if the changeset is obsolete
         unfilteredrepo = repo.unfiltered()
         ctx = revsymbol(unfilteredrepo, changeid)
 
         # If the changeset is obsolete, enrich the message with the reason
         # that made this changeset not visible
         if ctx.obsolete():
             msg = obsutil._getfilteredreason(repo, changeid, ctx)
         else:
             msg = _(b"hidden revision '%s'") % changeid
 
         hint = _(b'use --hidden to access hidden revisions')
 
         return error.FilteredRepoLookupError(msg, hint=hint)
     msg = _(b"filtered revision '%s' (not in '%s' subset)")
     msg %= (changeid, repo.filtername)
     return error.FilteredRepoLookupError(msg)
 
 
 def revsingle(repo, revspec, default=b'.', localalias=None):
     if not revspec and revspec != 0:
         return repo[default]
 
     l = revrange(repo, [revspec], localalias=localalias)
     if not l:
         raise error.InputError(_(b'empty revision set'))
     return repo[l.last()]
 
 
 def _pairspec(revspec):
     tree = revsetlang.parse(revspec)
     return tree and tree[0] in (
         b'range',
         b'rangepre',
         b'rangepost',
         b'rangeall',
     )
 
 
 def revpair(repo, revs):
     if not revs:
         return repo[b'.'], repo[None]
 
     l = revrange(repo, revs)
 
     if not l:
         raise error.InputError(_(b'empty revision range'))
 
     first = l.first()
     second = l.last()
 
     if (
         first == second
         and len(revs) >= 2
         and not all(revrange(repo, [r]) for r in revs)
     ):
         raise error.InputError(_(b'empty revision on one side of range'))
 
     # if top-level is range expression, the result must always be a pair
     if first == second and len(revs) == 1 and not _pairspec(revs[0]):
         return repo[first], repo[None]
 
     return repo[first], repo[second]
 
 
 def revrange(repo, specs, localalias=None):
     """Execute 1 to many revsets and return the union.
 
     This is the preferred mechanism for executing revsets using user-specified
     config options, such as revset aliases.
 
     The revsets specified by ``specs`` will be executed via a chained ``OR``
     expression. If ``specs`` is empty, an empty result is returned.
 
     ``specs`` can contain integers, in which case they are assumed to be
     revision numbers.
 
     It is assumed the revsets are already formatted. If you have arguments
     that need to be expanded in the revset, call ``revsetlang.formatspec()``
     and pass the result as an element of ``specs``.
 
     Specifying a single revset is allowed.
 
     Returns a ``smartset.abstractsmartset`` which is a list-like interface over
     integer revisions.
     """
     allspecs = []
     for spec in specs:
         if isinstance(spec, int):
             spec = revsetlang.formatspec(b'%d', spec)
         allspecs.append(spec)
     return repo.anyrevs(allspecs, user=True, localalias=localalias)
 
 
 def increasingwindows(windowsize=8, sizelimit=512):
     while True:
         yield windowsize
         if windowsize < sizelimit:
             windowsize *= 2
 
 
 def walkchangerevs(repo, revs, makefilematcher, prepare):
     """Iterate over files and the revs in a "windowed" way.
 
     Callers most commonly need to iterate backwards over the history
     in which they are interested. Doing so has awful (quadratic-looking)
     performance, so we use iterators in a "windowed" way.
 
     We walk a window of revisions in the desired order.  Within the
     window, we first walk forwards to gather data, then in the desired
     order (usually backwards) to display it.
 
     This function returns an iterator yielding contexts. Before
     yielding each context, the iterator will first call the prepare
     function on each context in the window in forward order."""
 
     if not revs:
         return []
     change = repo.__getitem__
 
     def iterate():
         it = iter(revs)
         stopiteration = False
         for windowsize in increasingwindows():
             nrevs = []
             for i in range(windowsize):
                 rev = next(it, None)
                 if rev is None:
                     stopiteration = True
                     break
                 nrevs.append(rev)
             for rev in sorted(nrevs):
                 ctx = change(rev)
                 prepare(ctx, makefilematcher(ctx))
             for rev in nrevs:
                 yield change(rev)
 
             if stopiteration:
                 break
 
     return iterate()
 
 
 def meaningfulparents(repo, ctx):
     """Return list of meaningful (or all if debug) parentrevs for rev.
 
     For merges (two non-nullrev revisions) both parents are meaningful.
     Otherwise the first parent revision is considered meaningful if it
     is not the preceding revision.
     """
     parents = ctx.parents()
     if len(parents) > 1:
         return parents
     if repo.ui.debugflag:
         return [parents[0], repo[nullrev]]
     if parents[0].rev() >= intrev(ctx) - 1:
         return []
     return parents
 
 
 def getuipathfn(repo, legacyrelativevalue=False, forcerelativevalue=None):
     """Return a function that produced paths for presenting to the user.
 
     The returned function takes a repo-relative path and produces a path
     that can be presented in the UI.
 
     Depending on the value of ui.relative-paths, either a repo-relative or
     cwd-relative path will be produced.
 
     legacyrelativevalue is the value to use if ui.relative-paths=legacy
 
     If forcerelativevalue is not None, then that value will be used regardless
     of what ui.relative-paths is set to.
     """
     if forcerelativevalue is not None:
         relative = forcerelativevalue
     else:
         config = repo.ui.config(b'ui', b'relative-paths')
         if config == b'legacy':
             relative = legacyrelativevalue
         else:
             relative = stringutil.parsebool(config)
             if relative is None:
                 raise error.ConfigError(
                     _(b"ui.relative-paths is not a boolean ('%s')") % config
                 )
 
     if relative:
         cwd = repo.getcwd()
         if cwd != b'':
             # this branch would work even if cwd == b'' (ie cwd = repo
             # root), but its generality makes the returned function slower
             pathto = repo.pathto
             return lambda f: pathto(f, cwd)
     if repo.ui.configbool(b'ui', b'slash'):
         return lambda f: f
     else:
         return util.localpath
 
 
 def subdiruipathfn(subpath, uipathfn):
     '''Create a new uipathfn that treats the file as relative to subpath.'''
     return lambda f: uipathfn(posixpath.join(subpath, f))
 
 
 def anypats(pats, opts):
     """Checks if any patterns, including --include and --exclude were given.
 
     Some commands (e.g. addremove) use this condition for deciding whether to
     print absolute or relative paths.
     """
     return bool(pats or opts.get(b'include') or opts.get(b'exclude'))
 
 
 def expandpats(pats):
     """Expand bare globs when running on windows.
     On posix we assume it already has already been done by sh."""
     if not util.expandglobs:
         return list(pats)
     ret = []
     for kindpat in pats:
         kind, pat = matchmod._patsplit(kindpat, None)
         if kind is None:
             try:
                 globbed = glob.glob(pat)
             except re.error:
                 globbed = [pat]
             if globbed:
                 ret.extend(globbed)
                 continue
         ret.append(kindpat)
     return ret
 
 
 def matchandpats(
     ctx, pats=(), opts=None, globbed=False, default=b'relpath', badfn=None
 ):
     """Return a matcher and the patterns that were used.
     The matcher will warn about bad matches, unless an alternate badfn callback
     is provided."""
     if opts is None:
         opts = {}
     if not globbed and default == b'relpath':
         pats = expandpats(pats or [])
 
     uipathfn = getuipathfn(ctx.repo(), legacyrelativevalue=True)
 
     def bad(f, msg):
         ctx.repo().ui.warn(b"%s: %s\n" % (uipathfn(f), msg))
 
     if badfn is None:
         badfn = bad
 
     m = ctx.match(
         pats,
         opts.get(b'include'),
         opts.get(b'exclude'),
         default,
         listsubrepos=opts.get(b'subrepos'),
         badfn=badfn,
     )
 
     if m.always():
         pats = []
     return m, pats
 
 
 def match(
     ctx, pats=(), opts=None, globbed=False, default=b'relpath', badfn=None
 ):
     '''Return a matcher that will warn about bad matches.'''
     return matchandpats(ctx, pats, opts, globbed, default, badfn=badfn)[0]
 
 
 def matchall(repo):
     '''Return a matcher that will efficiently match everything.'''
     return matchmod.always()
 
 
 def matchfiles(repo, files, badfn=None):
     '''Return a matcher that will efficiently match exactly these files.'''
     return matchmod.exact(files, badfn=badfn)
 
 
 def parsefollowlinespattern(repo, rev, pat, msg):
     """Return a file name from `pat` pattern suitable for usage in followlines
     logic.
     """
     if not matchmod.patkind(pat):
         return pathutil.canonpath(repo.root, repo.getcwd(), pat)
     else:
         ctx = repo[rev]
         m = matchmod.match(repo.root, repo.getcwd(), [pat], ctx=ctx)
         files = [f for f in ctx if m(f)]
         if len(files) != 1:
             raise error.ParseError(msg)
         return files[0]
 
 
 def getorigvfs(ui, repo):
     """return a vfs suitable to save 'orig' file
 
     return None if no special directory is configured"""
     origbackuppath = ui.config(b'ui', b'origbackuppath')
     if not origbackuppath:
         return None
     return vfs.vfs(repo.wvfs.join(origbackuppath))
 
 
 def backuppath(ui, repo, filepath):
     """customize where working copy backup files (.orig files) are created
 
     Fetch user defined path from config file: [ui] origbackuppath = <path>
     Fall back to default (filepath with .orig suffix) if not specified
 
     filepath is repo-relative
 
     Returns an absolute path
     """
     origvfs = getorigvfs(ui, repo)
     if origvfs is None:
         return repo.wjoin(filepath + b".orig")
 
     origbackupdir = origvfs.dirname(filepath)
     if not origvfs.isdir(origbackupdir) or origvfs.islink(origbackupdir):
         ui.note(_(b'creating directory: %s\n') % origvfs.join(origbackupdir))
 
         # Remove any files that conflict with the backup file's path
         for f in reversed(list(pathutil.finddirs(filepath))):
             if origvfs.isfileorlink(f):
                 ui.note(_(b'removing conflicting file: %s\n') % origvfs.join(f))
                 origvfs.unlink(f)
                 break
 
         origvfs.makedirs(origbackupdir)
 
     if origvfs.isdir(filepath) and not origvfs.islink(filepath):
         ui.note(
             _(b'removing conflicting directory: %s\n') % origvfs.join(filepath)
         )
         origvfs.rmtree(filepath, forcibly=True)
 
     return origvfs.join(filepath)
 
 
 class _containsnode:
     """proxy __contains__(node) to container.__contains__ which accepts revs"""
 
     def __init__(self, repo, revcontainer):
         self._torev = repo.changelog.rev
         self._revcontains = revcontainer.__contains__
 
     def __contains__(self, node):
         return self._revcontains(self._torev(node))
 
 
 def cleanupnodes(
     repo,
     replacements,
     operation,
     moves=None,
     metadata=None,
     fixphase=False,
     targetphase=None,
     backup=True,
 ):
     """do common cleanups when old nodes are replaced by new nodes
 
     That includes writing obsmarkers or stripping nodes, and moving bookmarks.
     (we might also want to move working directory parent in the future)
 
     By default, bookmark moves are calculated automatically from 'replacements',
     but 'moves' can be used to override that. Also, 'moves' may include
     additional bookmark moves that should not have associated obsmarkers.
 
     replacements is {oldnode: [newnode]} or a iterable of nodes if they do not
     have replacements. operation is a string, like "rebase".
 
     metadata is dictionary containing metadata to be stored in obsmarker if
     obsolescence is enabled.
     """
     assert fixphase or targetphase is None
     if not replacements and not moves:
         return
 
     # translate mapping's other forms
     if not hasattr(replacements, 'items'):
         replacements = {(n,): () for n in replacements}
     else:
         # upgrading non tuple "source" to tuple ones for BC
         repls = {}
         for key, value in replacements.items():
             if not isinstance(key, tuple):
                 key = (key,)
             repls[key] = value
         replacements = repls
 
     # Unfiltered repo is needed since nodes in replacements might be hidden.
     unfi = repo.unfiltered()
 
     # Calculate bookmark movements
     if moves is None:
         moves = {}
         for oldnodes, newnodes in replacements.items():
             for oldnode in oldnodes:
                 if oldnode in moves:
                     continue
                 if len(newnodes) > 1:
                     # usually a split, take the one with biggest rev number
                     newnode = next(unfi.set(b'max(%ln)', newnodes)).node()
                 elif len(newnodes) == 0:
                     # move bookmark backwards
                     allreplaced = []
                     for rep in replacements:
                         allreplaced.extend(rep)
                     roots = list(
                         unfi.set(b'max((::%n) - %ln)', oldnode, allreplaced)
                     )
                     if roots:
                         newnode = roots[0].node()
                     else:
                         newnode = repo.nullid
                 else:
                     newnode = newnodes[0]
                 moves[oldnode] = newnode
 
     allnewnodes = [n for ns in replacements.values() for n in ns]
     toretract = {}
     toadvance = {}
     if fixphase:
         precursors = {}
         for oldnodes, newnodes in replacements.items():
             for oldnode in oldnodes:
                 for newnode in newnodes:
                     precursors.setdefault(newnode, []).append(oldnode)
 
         allnewnodes.sort(key=lambda n: unfi[n].rev())
         newphases = {}
 
         def phase(ctx):
             return newphases.get(ctx.node(), ctx.phase())
 
         for newnode in allnewnodes:
             ctx = unfi[newnode]
             parentphase = max(phase(p) for p in ctx.parents())
             if targetphase is None:
                 oldphase = max(
                     unfi[oldnode].phase() for oldnode in precursors[newnode]
                 )
                 newphase = max(oldphase, parentphase)
             else:
                 newphase = max(targetphase, parentphase)
             newphases[newnode] = newphase
             if newphase > ctx.phase():
                 toretract.setdefault(newphase, []).append(newnode)
             elif newphase < ctx.phase():
                 toadvance.setdefault(newphase, []).append(newnode)
 
     with repo.transaction(b'cleanup') as tr:
         # Move bookmarks
         bmarks = repo._bookmarks
         bmarkchanges = []
         for oldnode, newnode in moves.items():
             oldbmarks = repo.nodebookmarks(oldnode)
             if not oldbmarks:
                 continue
             from . import bookmarks  # avoid import cycle
 
             repo.ui.debug(
                 b'moving bookmarks %r from %s to %s\n'
                 % (
                     pycompat.rapply(pycompat.maybebytestr, oldbmarks),
                     hex(oldnode),
                     hex(newnode),
                 )
             )
             # Delete divergent bookmarks being parents of related newnodes
             deleterevs = repo.revs(
                 b'parents(roots(%ln & (::%n))) - parents(%n)',
                 allnewnodes,
                 newnode,
                 oldnode,
             )
             deletenodes = _containsnode(repo, deleterevs)
             for name in oldbmarks:
                 bmarkchanges.append((name, newnode))
                 for b in bookmarks.divergent2delete(repo, deletenodes, name):
                     bmarkchanges.append((b, None))
 
         if bmarkchanges:
             bmarks.applychanges(repo, tr, bmarkchanges)
 
         for phase, nodes in toretract.items():
             phases.retractboundary(repo, tr, phase, nodes)
         for phase, nodes in toadvance.items():
             phases.advanceboundary(repo, tr, phase, nodes)
 
         mayusearchived = repo.ui.config(b'experimental', b'cleanup-as-archived')
         # Obsolete or strip nodes
         if obsolete.isenabled(repo, obsolete.createmarkersopt):
             # If a node is already obsoleted, and we want to obsolete it
             # without a successor, skip that obssolete request since it's
             # unnecessary. That's the "if s or not isobs(n)" check below.
             # Also sort the node in topology order, that might be useful for
             # some obsstore logic.
             # NOTE: the sorting might belong to createmarkers.
             torev = unfi.changelog.rev
             sortfunc = lambda ns: torev(ns[0][0])
             rels = []
             for ns, s in sorted(replacements.items(), key=sortfunc):
                 rel = (tuple(unfi[n] for n in ns), tuple(unfi[m] for m in s))
                 rels.append(rel)
             if rels:
                 obsolete.createmarkers(
                     repo, rels, operation=operation, metadata=metadata
                 )
         elif phases.supportarchived(repo) and mayusearchived:
             # this assume we do not have "unstable" nodes above the cleaned ones
             allreplaced = set()
             for ns in replacements.keys():
                 allreplaced.update(ns)
             if backup:
                 from . import repair  # avoid import cycle
 
                 node = min(allreplaced, key=repo.changelog.rev)
                 repair.backupbundle(
                     repo, allreplaced, allreplaced, node, operation
                 )
             phases.retractboundary(repo, tr, phases.archived, allreplaced)
         else:
             from . import repair  # avoid import cycle
 
             tostrip = list(n for ns in replacements for n in ns)
             if tostrip:
                 repair.delayedstrip(
                     repo.ui, repo, tostrip, operation, backup=backup
                 )
 
 
 def addremove(repo, matcher, prefix, uipathfn, opts=None, open_tr=None):
     if opts is None:
         opts = {}
     m = matcher
     dry_run = opts.get(b'dry_run')
     try:
         similarity = float(opts.get(b'similarity') or 0)
     except ValueError:
         raise error.InputError(_(b'similarity must be a number'))
     if similarity < 0 or similarity > 100:
         raise error.InputError(_(b'similarity must be between 0 and 100'))
     similarity /= 100.0
 
     ret = 0
 
     wctx = repo[None]
     for subpath in sorted(wctx.substate):
         submatch = matchmod.subdirmatcher(subpath, m)
         if opts.get(b'subrepos') or m.exact(subpath) or any(submatch.files()):
             sub = wctx.sub(subpath)
             subprefix = repo.wvfs.reljoin(prefix, subpath)
             subuipathfn = subdiruipathfn(subpath, uipathfn)
             try:
                 if sub.addremove(submatch, subprefix, subuipathfn, opts):
                     ret = 1
             except error.LookupError:
                 repo.ui.status(
                     _(b"skipping missing subrepository: %s\n")
                     % uipathfn(subpath)
                 )
 
     rejected = []
 
     def badfn(f, msg):
         if f in m.files():
             m.bad(f, msg)
         rejected.append(f)
 
     badmatch = matchmod.badmatch(m, badfn)
     added, unknown, deleted, removed, forgotten = _interestingfiles(
         repo, badmatch
     )
 
     unknownset = set(unknown + forgotten)
     toprint = unknownset.copy()
     toprint.update(deleted)
     for abs in sorted(toprint):
         if repo.ui.verbose or not m.exact(abs):
             if abs in unknownset:
                 status = _(b'adding %s\n') % uipathfn(abs)
                 label = b'ui.addremove.added'
             else:
                 status = _(b'removing %s\n') % uipathfn(abs)
                 label = b'ui.addremove.removed'
             repo.ui.status(status, label=label)
 
     renames = _findrenames(
         repo, m, added + unknown, removed + deleted, similarity, uipathfn
     )
 
     if not dry_run and (unknown or forgotten or deleted or renames):
         if open_tr is not None:
             open_tr()
         _markchanges(repo, unknown + forgotten, deleted, renames)
 
     for f in rejected:
         if f in m.files():
             return 1
     return ret
 
 
 def marktouched(repo, files, similarity=0.0):
     """Assert that files have somehow been operated upon. files are relative to
     the repo root."""
     m = matchfiles(repo, files, badfn=lambda x, y: rejected.append(x))
     rejected = []
 
     added, unknown, deleted, removed, forgotten = _interestingfiles(repo, m)
 
     if repo.ui.verbose:
         unknownset = set(unknown + forgotten)
         toprint = unknownset.copy()
         toprint.update(deleted)
         for abs in sorted(toprint):
             if abs in unknownset:
                 status = _(b'adding %s\n') % abs
             else:
                 status = _(b'removing %s\n') % abs
             repo.ui.status(status)
 
     # TODO: We should probably have the caller pass in uipathfn and apply it to
     # the messages above too. legacyrelativevalue=True is consistent with how
     # it used to work.
     uipathfn = getuipathfn(repo, legacyrelativevalue=True)
     renames = _findrenames(
         repo, m, added + unknown, removed + deleted, similarity, uipathfn
     )
 
     _markchanges(repo, unknown + forgotten, deleted, renames)
 
     for f in rejected:
         if f in m.files():
             return 1
     return 0
 
 
 def _interestingfiles(repo, matcher):
     """Walk dirstate with matcher, looking for files that addremove would care
     about.
 
     This is different from dirstate.status because it doesn't care about
     whether files are modified or clean."""
     added, unknown, deleted, removed, forgotten = [], [], [], [], []
     audit_path = pathutil.pathauditor(repo.root, cached=True)
 
     ctx = repo[None]
     dirstate = repo.dirstate
     matcher = repo.narrowmatch(matcher, includeexact=True)
     walkresults = dirstate.walk(
         matcher,
         subrepos=sorted(ctx.substate),
         unknown=True,
         ignored=False,
         full=False,
     )
     for abs, st in walkresults.items():
         entry = dirstate.get_entry(abs)
         if (not entry.any_tracked) and audit_path.check(abs):
             unknown.append(abs)
         elif (not entry.removed) and not st:
             deleted.append(abs)
         elif entry.removed and st:
             forgotten.append(abs)
         # for finding renames
         elif entry.removed and not st:
             removed.append(abs)
         elif entry.added:
             added.append(abs)
 
     return added, unknown, deleted, removed, forgotten
 
 
 def _findrenames(repo, matcher, added, removed, similarity, uipathfn):
     '''Find renames from removed files to added ones.'''
     renames = {}
     if similarity > 0:
         for old, new, score in similar.findrenames(
             repo, added, removed, similarity
         ):
             if (
                 repo.ui.verbose
                 or not matcher.exact(old)
                 or not matcher.exact(new)
             ):
                 repo.ui.status(
                     _(
                         b'recording removal of %s as rename to %s '
                         b'(%d%% similar)\n'
                     )
                     % (uipathfn(old), uipathfn(new), score * 100)
                 )
             renames[new] = old
     return renames
 
 
 def _markchanges(repo, unknown, deleted, renames):
     """Marks the files in unknown as added, the files in deleted as removed,
     and the files in renames as copied."""
     wctx = repo[None]
     with repo.wlock():
         wctx.forget(deleted)
         wctx.add(unknown)
         for new, old in renames.items():
             wctx.copy(old, new)
 
 
 def getrenamedfn(repo, endrev=None):
     if copiesmod.usechangesetcentricalgo(repo):
 
         def getrenamed(fn, rev):
             ctx = repo[rev]
             p1copies = ctx.p1copies()
             if fn in p1copies:
                 return p1copies[fn]
             p2copies = ctx.p2copies()
             if fn in p2copies:
                 return p2copies[fn]
             return None
 
         return getrenamed
 
     rcache = {}
     if endrev is None:
         endrev = len(repo)
 
     def getrenamed(fn, rev):
         """looks up all renames for a file (up to endrev) the first
         time the file is given. It indexes on the changerev and only
         parses the manifest if linkrev != changerev.
         Returns rename info for fn at changerev rev."""
         if fn not in rcache:
             rcache[fn] = {}
             fl = repo.file(fn)
             for i in fl:
                 lr = fl.linkrev(i)
                 renamed = fl.renamed(fl.node(i))
                 rcache[fn][lr] = renamed and renamed[0]
                 if lr >= endrev:
                     break
         if rev in rcache[fn]:
             return rcache[fn][rev]
 
         # If linkrev != rev (i.e. rev not found in rcache) fallback to
         # filectx logic.
         try:
             return repo[rev][fn].copysource()
         except error.LookupError:
             return None
 
     return getrenamed
 
 
 def getcopiesfn(repo, endrev=None):
     if copiesmod.usechangesetcentricalgo(repo):
 
         def copiesfn(ctx):
             if ctx.p2copies():
                 allcopies = ctx.p1copies().copy()
                 # There should be no overlap
                 allcopies.update(ctx.p2copies())
                 return sorted(allcopies.items())
             else:
                 return sorted(ctx.p1copies().items())
 
     else:
         getrenamed = getrenamedfn(repo, endrev)
 
         def copiesfn(ctx):
             copies = []
             for fn in ctx.files():
                 rename = getrenamed(fn, ctx.rev())
                 if rename:
                     copies.append((fn, rename))
             return copies
 
     return copiesfn
 
 
 def dirstatecopy(ui, repo, wctx, src, dst, dryrun=False, cwd=None):
     """Update the dirstate to reflect the intent of copying src to dst. For
     different reasons it might not end with dst being marked as copied from src.
     """
     origsrc = repo.dirstate.copied(src) or src
     if dst == origsrc:  # copying back a copy?
         entry = repo.dirstate.get_entry(dst)
         if (entry.added or not entry.tracked) and not dryrun:
             repo.dirstate.set_tracked(dst)
     else:
         if repo.dirstate.get_entry(origsrc).added and origsrc == src:
             if not ui.quiet:
                 ui.warn(
                     _(
                         b"%s has not been committed yet, so no copy "
                         b"data will be stored for %s.\n"
                     )
                     % (repo.pathto(origsrc, cwd), repo.pathto(dst, cwd))
                 )
             if not repo.dirstate.get_entry(dst).tracked and not dryrun:
                 wctx.add([dst])
         elif not dryrun:
             wctx.copy(origsrc, dst)
 
 
 def movedirstate(repo, newctx, match=None):
     """Move the dirstate to newctx and adjust it as necessary.
 
     A matcher can be provided as an optimization. It is probably a bug to pass
     a matcher that doesn't match all the differences between the parent of the
     working copy and newctx.
     """
     oldctx = repo[b'.']
     ds = repo.dirstate
     copies = dict(ds.copies())
     ds.setparents(newctx.node(), repo.nullid)
     s = newctx.status(oldctx, match=match)
 
     for f in s.modified:
         ds.update_file_p1(f, p1_tracked=True)
 
     for f in s.added:
         ds.update_file_p1(f, p1_tracked=False)
 
     for f in s.removed:
         ds.update_file_p1(f, p1_tracked=True)
 
     # Merge old parent and old working dir copies
     oldcopies = copiesmod.pathcopies(newctx, oldctx, match)
     oldcopies.update(copies)
     copies = {dst: oldcopies.get(src, src) for dst, src in oldcopies.items()}
     # Adjust the dirstate copies
     for dst, src in copies.items():
         if src not in newctx or dst in newctx or not ds.get_entry(dst).added:
             src = None
         ds.copy(src, dst)
     repo._quick_access_changeid_invalidate()
 
 
 def filterrequirements(requirements):
     """filters the requirements into two sets:
 
     wcreq: requirements which should be written in .hg/requires
     storereq: which should be written in .hg/store/requires
 
     Returns (wcreq, storereq)
     """
     if requirementsmod.SHARESAFE_REQUIREMENT in requirements:
         wc, store = set(), set()
         for r in requirements:
             if r in requirementsmod.WORKING_DIR_REQUIREMENTS:
                 wc.add(r)
             else:
                 store.add(r)
         return wc, store
     return requirements, None
 
 
 def istreemanifest(repo):
     """returns whether the repository is using treemanifest or not"""
     return requirementsmod.TREEMANIFEST_REQUIREMENT in repo.requirements
 
 
 def writereporequirements(repo, requirements=None):
     """writes requirements for the repo
 
     Requirements are written to .hg/requires and .hg/store/requires based
     on whether share-safe mode is enabled and which requirements are wdir
     requirements and which are store requirements
     """
     if requirements:
         repo.requirements = requirements
     wcreq, storereq = filterrequirements(repo.requirements)
     if wcreq is not None:
         writerequires(repo.vfs, wcreq)
     if storereq is not None:
         writerequires(repo.svfs, storereq)
     elif repo.ui.configbool(b'format', b'usestore'):
         # only remove store requires if we are using store
         repo.svfs.tryunlink(b'requires')
 
 
 def writerequires(opener, requirements):
     with opener(b'requires', b'w', atomictemp=True) as fp:
         for r in sorted(requirements):
             fp.write(b"%s\n" % r)
 
 
 class filecachesubentry:
     def __init__(self, path, stat):
         self.path = path
         self.cachestat = None
         self._cacheable = None
 
         if stat:
             self.cachestat = filecachesubentry.stat(self.path)
 
             if self.cachestat:
                 self._cacheable = self.cachestat.cacheable()
             else:
                 # None means we don't know yet
                 self._cacheable = None
 
     def refresh(self):
         if self.cacheable():
             self.cachestat = filecachesubentry.stat(self.path)
 
     def cacheable(self):
         if self._cacheable is not None:
             return self._cacheable
 
         # we don't know yet, assume it is for now
         return True
 
     def changed(self):
         # no point in going further if we can't cache it
         if not self.cacheable():
             return True
 
         newstat = filecachesubentry.stat(self.path)
 
         # we may not know if it's cacheable yet, check again now
         if newstat and self._cacheable is None:
             self._cacheable = newstat.cacheable()
 
             # check again
             if not self._cacheable:
                 return True
 
         if self.cachestat != newstat:
             self.cachestat = newstat
             return True
         else:
             return False
 
     @staticmethod
     def stat(path):
         try:
             return util.cachestat(path)
         except FileNotFoundError:
             pass
 
 
 class filecacheentry:
     def __init__(self, paths, stat=True):
         self._entries = []
         for path in paths:
             self._entries.append(filecachesubentry(path, stat))
 
     def changed(self):
         '''true if any entry has changed'''
         for entry in self._entries:
             if entry.changed():
                 return True
         return False
 
     def refresh(self):
         for entry in self._entries:
             entry.refresh()
 
 
 class filecache:
     """A property like decorator that tracks files under .hg/ for updates.
 
     On first access, the files defined as arguments are stat()ed and the
     results cached. The decorated function is called. The results are stashed
     away in a ``_filecache`` dict on the object whose method is decorated.
 
     On subsequent access, the cached result is used as it is set to the
     instance dictionary.
 
     On external property set/delete operations, the caller must update the
     corresponding _filecache entry appropriately. Use __class__.<attr>.set()
     instead of directly setting <attr>.
 
     When using the property API, the cached data is always used if available.
     No stat() is performed to check if the file has changed.
 
     Others can muck about with the state of the ``_filecache`` dict. e.g. they
     can populate an entry before the property's getter is called. In this case,
     entries in ``_filecache`` will be used during property operations,
     if available. If the underlying file changes, it is up to external callers
     to reflect this by e.g. calling ``delattr(obj, attr)`` to remove the cached
     method result as well as possibly calling ``del obj._filecache[attr]`` to
     remove the ``filecacheentry``.
     """
 
     def __init__(self, *paths):
         self.paths = paths
 
     def tracked_paths(self, obj):
         return [self.join(obj, path) for path in self.paths]
 
     def join(self, obj, fname):
         """Used to compute the runtime path of a cached file.
 
         Users should subclass filecache and provide their own version of this
         function to call the appropriate join function on 'obj' (an instance
         of the class that its member function was decorated).
         """
         raise NotImplementedError
 
     def __call__(self, func):
         self.func = func
         self.sname = func.__name__
         # XXX We should be using a unicode string instead of bytes for the main
         # name (and the _filecache key). The fact we use bytes is a remains
         # from Python2, since the name is derived from an attribute name a
         # `str` is a better fit now that we support Python3 only
         self.name = pycompat.sysbytes(self.sname)
         return self
 
     def __get__(self, obj, type=None):
         # if accessed on the class, return the descriptor itself.
         if obj is None:
             return self
 
         assert self.sname not in obj.__dict__
 
         entry = obj._filecache.get(self.name)
 
         if entry:
             if entry.changed():
                 entry.obj = self.func(obj)
         else:
             paths = self.tracked_paths(obj)
 
             # We stat -before- creating the object so our cache doesn't lie if
             # a writer modified between the time we read and stat
             entry = filecacheentry(paths, True)
             entry.obj = self.func(obj)
 
             obj._filecache[self.name] = entry
 
         obj.__dict__[self.sname] = entry.obj
         return entry.obj
 
     # don't implement __set__(), which would make __dict__ lookup as slow as
     # function call.
 
     def set(self, obj, value):
         if self.name not in obj._filecache:
             # we add an entry for the missing value because X in __dict__
             # implies X in _filecache
             paths = self.tracked_paths(obj)
             ce = filecacheentry(paths, False)
             obj._filecache[self.name] = ce
         else:
             ce = obj._filecache[self.name]
 
         ce.obj = value  # update cached copy
         obj.__dict__[self.sname] = value  # update copy returned by obj.x
 
 
 def extdatasource(repo, source):
     """Gather a map of rev -> value dict from the specified source
 
     A source spec is treated as a URL, with a special case shell: type
     for parsing the output from a shell command.
 
     The data is parsed as a series of newline-separated records where
     each record is a revision specifier optionally followed by a space
     and a freeform string value. If the revision is known locally, it
     is converted to a rev, otherwise the record is skipped.
 
     Note that both key and value are treated as UTF-8 and converted to
     the local encoding. This allows uniformity between local and
     remote data sources.
     """
 
     spec = repo.ui.config(b"extdata", source)
     if not spec:
         raise error.Abort(_(b"unknown extdata source '%s'") % source)
 
     data = {}
     src = proc = None
     try:
         if spec.startswith(b"shell:"):
             # external commands should be run relative to the repo root
             cmd = spec[6:]
             proc = subprocess.Popen(
                 procutil.tonativestr(cmd),
                 shell=True,
                 bufsize=-1,
                 close_fds=procutil.closefds,
                 stdout=subprocess.PIPE,
                 cwd=procutil.tonativestr(repo.root),
             )
             src = proc.stdout
         else:
             # treat as a URL or file
             src = url.open(repo.ui, spec)
         for l in src:
             if b" " in l:
                 k, v = l.strip().split(b" ", 1)
             else:
                 k, v = l.strip(), b""
 
             k = encoding.tolocal(k)
             try:
                 data[revsingle(repo, k).rev()] = encoding.tolocal(v)
             except (error.LookupError, error.RepoLookupError, error.InputError):
                 pass  # we ignore data for nodes that don't exist locally
     finally:
         if proc:
             try:
                 proc.communicate()
             except ValueError:
                 # This happens if we started iterating src and then
                 # get a parse error on a line. It should be safe to ignore.
                 pass
         if src:
             src.close()
     if proc and proc.returncode != 0:
         raise error.Abort(
             _(b"extdata command '%s' failed: %s")
             % (cmd, procutil.explainexit(proc.returncode))
         )
 
     return data
 
 
 class progress:
     def __init__(self, ui, updatebar, topic, unit=b"", total=None):
         self.ui = ui
         self.pos = 0
         self.topic = topic
         self.unit = unit
         self.total = total
         self.debug = ui.configbool(b'progress', b'debug')
         self._updatebar = updatebar
 
     def __enter__(self):
         return self
 
     def __exit__(self, exc_type, exc_value, exc_tb):
         self.complete()
 
     def update(self, pos, item=b"", total=None):
         assert pos is not None
         if total:
             self.total = total
         self.pos = pos
         self._updatebar(self.topic, self.pos, item, self.unit, self.total)
         if self.debug:
             self._printdebug(item)
 
     def increment(self, step=1, item=b"", total=None):
         self.update(self.pos + step, item, total)
 
     def complete(self):
         self.pos = None
         self.unit = b""
         self.total = None
         self._updatebar(self.topic, self.pos, b"", self.unit, self.total)
 
     def _printdebug(self, item):
         unit = b''
         if self.unit:
             unit = b' ' + self.unit
         if item:
             item = b' ' + item
 
         if self.total:
             pct = 100.0 * self.pos / self.total
             self.ui.debug(
                 b'%s:%s %d/%d%s (%4.2f%%)\n'
                 % (self.topic, item, self.pos, self.total, unit, pct)
             )
         else:
             self.ui.debug(b'%s:%s %d%s\n' % (self.topic, item, self.pos, unit))
 
 
 def gdinitconfig(ui):
     """helper function to know if a repo should be created as general delta"""
     # experimental config: format.generaldelta
     return ui.configbool(b'format', b'generaldelta') or ui.configbool(
         b'format', b'usegeneraldelta'
     )
 
 
 def gddeltaconfig(ui):
     """helper function to know if incoming deltas should be optimized
 
     The `format.generaldelta` config is an old form of the config that also
     implies that incoming delta-bases should be never be trusted. This function
     exists for this purpose.
     """
     # experimental config: format.generaldelta
     return ui.configbool(b'format', b'generaldelta')
 
 
 class simplekeyvaluefile:
     """A simple file with key=value lines
 
     Keys must be alphanumerics and start with a letter, values must not
     contain '\n' characters"""
 
     firstlinekey = b'__firstline'
 
     def __init__(self, vfs, path, keys=None):
         self.vfs = vfs
         self.path = path
 
     def read(self, firstlinenonkeyval=False):
         """Read the contents of a simple key-value file
 
         'firstlinenonkeyval' indicates whether the first line of file should
         be treated as a key-value pair or reuturned fully under the
         __firstline key."""
         lines = self.vfs.readlines(self.path)
         d = {}
         if firstlinenonkeyval:
             if not lines:
                 e = _(b"empty simplekeyvalue file")
                 raise error.CorruptedState(e)
             # we don't want to include '\n' in the __firstline
             d[self.firstlinekey] = lines[0][:-1]
             del lines[0]
 
         try:
             # the 'if line.strip()' part prevents us from failing on empty
             # lines which only contain '\n' therefore are not skipped
             # by 'if line'
             updatedict = dict(
                 line[:-1].split(b'=', 1) for line in lines if line.strip()
             )
             if self.firstlinekey in updatedict:
                 e = _(b"%r can't be used as a key")
                 raise error.CorruptedState(e % self.firstlinekey)
             d.update(updatedict)
         except ValueError as e:
             raise error.CorruptedState(stringutil.forcebytestr(e))
         return d
 
     def write(self, data, firstline=None):
         """Write key=>value mapping to a file
         data is a dict. Keys must be alphanumerical and start with a letter.
         Values must not contain newline characters.
 
         If 'firstline' is not None, it is written to file before
         everything else, as it is, not in a key=value form"""
         lines = []
         if firstline is not None:
             lines.append(b'%s\n' % firstline)
 
         for k, v in data.items():
             if k == self.firstlinekey:
                 e = b"key name '%s' is reserved" % self.firstlinekey
                 raise error.ProgrammingError(e)
             if not k[0:1].isalpha():
                 e = b"keys must start with a letter in a key-value file"
                 raise error.ProgrammingError(e)
             if not k.isalnum():
                 e = b"invalid key name in a simple key-value file"
                 raise error.ProgrammingError(e)
             if b'\n' in v:
                 e = b"invalid value in a simple key-value file"
                 raise error.ProgrammingError(e)
             lines.append(b"%s=%s\n" % (k, v))
         with self.vfs(self.path, mode=b'wb', atomictemp=True) as fp:
             fp.write(b''.join(lines))
 
 
 _reportobsoletedsource = [
     b'debugobsolete',
     b'pull',
     b'push',
     b'serve',
     b'unbundle',
 ]
 
 _reportnewcssource = [
     b'pull',
     b'unbundle',
 ]
 
 
 def prefetchfiles(repo, revmatches):
     """Invokes the registered file prefetch functions, allowing extensions to
     ensure the corresponding files are available locally, before the command
     uses them.
 
     Args:
       revmatches: a list of (revision, match) tuples to indicate the files to
       fetch at each revision. If any of the match elements is None, it matches
       all files.
     """
 
     def _matcher(m):
         if m:
             assert isinstance(m, matchmod.basematcher)
             # The command itself will complain about files that don't exist, so
             # don't duplicate the message.
             return matchmod.badmatch(m, lambda fn, msg: None)
         else:
             return matchall(repo)
 
     revbadmatches = [(rev, _matcher(match)) for (rev, match) in revmatches]
 
     fileprefetchhooks(repo, revbadmatches)
 
 
 # a list of (repo, revs, match) prefetch functions
 fileprefetchhooks = util.hooks()
 
 # A marker that tells the evolve extension to suppress its own reporting
 _reportstroubledchangesets = True
 
 
 def registersummarycallback(repo, otr, txnname=b'', as_validator=False):
     """register a callback to issue a summary after the transaction is closed
 
     If as_validator is true, then the callbacks are registered as transaction
     validators instead
     """
 
     def txmatch(sources):
         return any(txnname.startswith(source) for source in sources)
 
     categories = []
 
     def reportsummary(func):
         """decorator for report callbacks."""
         # The repoview life cycle is shorter than the one of the actual
         # underlying repository. So the filtered object can die before the
         # weakref is used leading to troubles. We keep a reference to the
         # unfiltered object and restore the filtering when retrieving the
         # repository through the weakref.
         filtername = repo.filtername
         reporef = weakref.ref(repo.unfiltered())
 
         def wrapped(tr):
             repo = reporef()
             if filtername:
                 assert repo is not None  # help pytype
                 repo = repo.filtered(filtername)
             func(repo, tr)
 
         newcat = b'%02i-txnreport' % len(categories)
         if as_validator:
             otr.addvalidator(newcat, wrapped)
         else:
             otr.addpostclose(newcat, wrapped)
         categories.append(newcat)
         return wrapped
 
     @reportsummary
     def reportchangegroup(repo, tr):
         cgchangesets = tr.changes.get(b'changegroup-count-changesets', 0)
         cgrevisions = tr.changes.get(b'changegroup-count-revisions', 0)
         cgfiles = tr.changes.get(b'changegroup-count-files', 0)
         cgheads = tr.changes.get(b'changegroup-count-heads', 0)
         if cgchangesets or cgrevisions or cgfiles:
             htext = b""
             if cgheads:
                 htext = _(b" (%+d heads)") % cgheads
             msg = _(b"added %d changesets with %d changes to %d files%s\n")
             if as_validator:
                 msg = _(b"adding %d changesets with %d changes to %d files%s\n")
             assert repo is not None  # help pytype
             repo.ui.status(msg % (cgchangesets, cgrevisions, cgfiles, htext))
 
     if txmatch(_reportobsoletedsource):
 
         @reportsummary
         def reportobsoleted(repo, tr):
             obsoleted = obsutil.getobsoleted(repo, tr)
             newmarkers = len(tr.changes.get(b'obsmarkers', ()))
             if newmarkers:
                 repo.ui.status(_(b'%i new obsolescence markers\n') % newmarkers)
             if obsoleted:
                 msg = _(b'obsoleted %i changesets\n')
                 if as_validator:
                     msg = _(b'obsoleting %i changesets\n')
                 repo.ui.status(msg % len(obsoleted))
 
     if obsolete.isenabled(
         repo, obsolete.createmarkersopt
     ) and repo.ui.configbool(
         b'experimental', b'evolution.report-instabilities'
     ):
         instabilitytypes = [
             (b'orphan', b'orphan'),
             (b'phase-divergent', b'phasedivergent'),
             (b'content-divergent', b'contentdivergent'),
         ]
 
         def getinstabilitycounts(repo):
             filtered = repo.changelog.filteredrevs
             counts = {}
             for instability, revset in instabilitytypes:
                 counts[instability] = len(
                     set(obsolete.getrevs(repo, revset)) - filtered
                 )
             return counts
 
         oldinstabilitycounts = getinstabilitycounts(repo)
 
         @reportsummary
         def reportnewinstabilities(repo, tr):
             newinstabilitycounts = getinstabilitycounts(repo)
             for instability, revset in instabilitytypes:
                 delta = (
                     newinstabilitycounts[instability]
                     - oldinstabilitycounts[instability]
                 )
                 msg = getinstabilitymessage(delta, instability)
                 if msg:
                     repo.ui.warn(msg)
 
     if txmatch(_reportnewcssource):
 
         @reportsummary
         def reportnewcs(repo, tr):
             """Report the range of new revisions pulled/unbundled."""
             origrepolen = tr.changes.get(b'origrepolen', len(repo))
             unfi = repo.unfiltered()
             if origrepolen >= len(unfi):
                 return
 
             # Compute the bounds of new visible revisions' range.
             revs = smartset.spanset(repo, start=origrepolen)
             if revs:
                 minrev, maxrev = repo[revs.min()], repo[revs.max()]
 
                 if minrev == maxrev:
                     revrange = minrev
                 else:
                     revrange = b'%s:%s' % (minrev, maxrev)
                 draft = len(repo.revs(b'%ld and draft()', revs))
                 secret = len(repo.revs(b'%ld and secret()', revs))
                 if not (draft or secret):
                     msg = _(b'new changesets %s\n') % revrange
                 elif draft and secret:
                     msg = _(b'new changesets %s (%d drafts, %d secrets)\n')
                     msg %= (revrange, draft, secret)
                 elif draft:
                     msg = _(b'new changesets %s (%d drafts)\n')
                     msg %= (revrange, draft)
                 elif secret:
                     msg = _(b'new changesets %s (%d secrets)\n')
                     msg %= (revrange, secret)
                 else:
                     errormsg = b'entered unreachable condition'
                     raise error.ProgrammingError(errormsg)
                 repo.ui.status(msg)
 
             # search new changesets directly pulled as obsolete
             duplicates = tr.changes.get(b'revduplicates', ())
             obsadded = unfi.revs(
                 b'(%d: + %ld) and obsolete()', origrepolen, duplicates
             )
             cl = repo.changelog
             extinctadded = [r for r in obsadded if r not in cl]
             if extinctadded:
                 # They are not just obsolete, but obsolete and invisible
                 # we call them "extinct" internally but the terms have not been
                 # exposed to users.
                 msg = b'(%d other changesets obsolete on arrival)\n'
                 repo.ui.status(msg % len(extinctadded))
 
         @reportsummary
         def reportphasechanges(repo, tr):
             """Report statistics of phase changes for changesets pre-existing
             pull/unbundle.
             """
             origrepolen = tr.changes.get(b'origrepolen', len(repo))
             published = []
             for revs, (old, new) in tr.changes.get(b'phases', []):
                 if new != phases.public:
                     continue
                 published.extend(rev for rev in revs if rev < origrepolen)
             if not published:
                 return
             msg = _(b'%d local changesets published\n')
             if as_validator:
                 msg = _(b'%d local changesets will be published\n')
             repo.ui.status(msg % len(published))
 
 
 def getinstabilitymessage(delta, instability):
     """function to return the message to show warning about new instabilities
 
     exists as a separate function so that extension can wrap to show more
     information like how to fix instabilities"""
     if delta > 0:
         return _(b'%i new %s changesets\n') % (delta, instability)
 
 
 def nodesummaries(repo, nodes, maxnumnodes=4):
     if len(nodes) <= maxnumnodes or repo.ui.verbose:
         return b' '.join(short(h) for h in nodes)
     first = b' '.join(short(h) for h in nodes[:maxnumnodes])
     return _(b"%s and %d others") % (first, len(nodes) - maxnumnodes)
 
 
 def enforcesinglehead(repo, tr, desc, accountclosed, filtername):
     """check that no named branch has multiple heads"""
     if desc in (b'strip', b'repair'):
         # skip the logic during strip
         return
     visible = repo.filtered(filtername)
     # possible improvement: we could restrict the check to affected branch
     bm = visible.branchmap()
     for name in bm:
         heads = bm.branchheads(name, closed=accountclosed)
         if len(heads) > 1:
             msg = _(b'rejecting multiple heads on branch "%s"')
             msg %= name
             hint = _(b'%d heads: %s')
             hint %= (len(heads), nodesummaries(repo, heads))
             raise error.Abort(msg, hint=hint)
 
 
 def wrapconvertsink(sink):
     """Allow extensions to wrap the sink returned by convcmd.convertsink()
     before it is used, whether or not the convert extension was formally loaded.
     """
     return sink
 
 
 def unhidehashlikerevs(repo, specs, hiddentype):
     """parse the user specs and unhide changesets whose hash or revision number
     is passed.
 
     hiddentype can be: 1) 'warn': warn while unhiding changesets
                        2) 'nowarn': don't warn while unhiding changesets
 
     returns a repo object with the required changesets unhidden
     """
     if not specs:
         return repo
 
     if not repo.filtername or not repo.ui.configbool(
         b'experimental', b'directaccess'
     ):
         return repo
 
     if repo.filtername not in (b'visible', b'visible-hidden'):
         return repo
 
     symbols = set()
     for spec in specs:
         try:
             tree = revsetlang.parse(spec)
         except error.ParseError:  # will be reported by scmutil.revrange()
             continue
 
         symbols.update(revsetlang.gethashlikesymbols(tree))
 
     if not symbols:
         return repo
 
     revs = _getrevsfromsymbols(repo, symbols)
 
     if not revs:
         return repo
 
     if hiddentype == b'warn':
         unfi = repo.unfiltered()
         revstr = b", ".join([pycompat.bytestr(unfi[l]) for l in revs])
         repo.ui.warn(
             _(
                 b"warning: accessing hidden changesets for write "
                 b"operation: %s\n"
             )
             % revstr
         )
 
     # we have to use new filtername to separate branch/tags cache until we can
     # disbale these cache when revisions are dynamically pinned.
     return repo.filtered(b'visible-hidden', revs)
 
 
 def _getrevsfromsymbols(repo, symbols):
     """parse the list of symbols and returns a set of revision numbers of hidden
     changesets present in symbols"""
     revs = set()
     unfi = repo.unfiltered()
     unficl = unfi.changelog
     cl = repo.changelog
     tiprev = len(unficl)
     allowrevnums = repo.ui.configbool(b'experimental', b'directaccess.revnums')
     for s in symbols:
         try:
             n = int(s)
             if n <= tiprev:
                 if not allowrevnums:
                     continue
                 else:
                     if n not in cl:
                         revs.add(n)
                     continue
         except ValueError:
             pass
 
         try:
             s = resolvehexnodeidprefix(unfi, s)
         except (error.LookupError, error.WdirUnsupported):
             s = None
 
         if s is not None:
             rev = unficl.rev(s)
             if rev not in cl:
                 revs.add(rev)
 
     return revs
 
 
 def bookmarkrevs(repo, mark):
     """Select revisions reachable by a given bookmark
 
     If the bookmarked revision isn't a head, an empty set will be returned.
     """
     return repo.revs(format_bookmark_revspec(mark))
 
 
 def format_bookmark_revspec(mark):
     """Build a revset expression to select revisions reachable by a given
     bookmark"""
     mark = b'literal:' + mark
     return revsetlang.formatspec(
         b"ancestors(bookmark(%s)) - "
         b"ancestors(head() and not bookmark(%s)) - "
         b"ancestors(bookmark() and not bookmark(%s))",
         mark,
         mark,
         mark,
     )
 
 
 def ismember(ui, username, userlist):
     """Check if username is a member of userlist.
 
     If userlist has a single '*' member, all users are considered members.
     Can be overridden by extensions to provide more complex authorization
     schemes.
     """
     return userlist == [b'*'] or username in userlist
+
+
+RESOURCE_HIGH = 3
+RESOURCE_MEDIUM = 2
+RESOURCE_LOW = 1
+RESOURCE_DEFAULT = 0
+
+RESOURCE_MAPPING = {
+    b'default': RESOURCE_DEFAULT,
+    b'low': RESOURCE_LOW,
+    b'medium': RESOURCE_MEDIUM,
+    b'high': RESOURCE_HIGH,
+}
+
+DEFAULT_RESOURCE = RESOURCE_MEDIUM
+
+
+def get_resource_profile(ui, dimension=None):
+    """return the resource profile for a dimension
+
+    If no dimension is specified, the generic value is returned"""
+    generic_name = ui.config(b'usage', b'resources')
+    value = RESOURCE_MAPPING.get(generic_name, RESOURCE_DEFAULT)
+    if value == RESOURCE_DEFAULT:
+        value = DEFAULT_RESOURCE
+    if dimension is not None:
+        sub_name = ui.config(b'usage', b'resources.%s' % dimension)
+        sub_value = RESOURCE_MAPPING.get(sub_name, RESOURCE_DEFAULT)
+        if sub_value != RESOURCE_DEFAULT:
+            value = sub_value
+    return value