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Help: config

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Configuration Files

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 --debug' 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 <firstname.lastname@example.net>
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:

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.

On Unix, the following files are consulted:

  • "<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>/default.d/*.rc" (defaults)

On Windows, the following files are consulted:

  • "<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-installation)
  • "<install-dir>\hgrc.d\*.rc" (per-installation)
  • "<install-dir>\Mercurial.ini" (per-installation)
  • "<internal>/default.d/*.rc" (defaults)

Note:

The registry key "HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Mercurial" is used when running 32-bit Python on 64-bit Windows.

On Plan9, the following files are consulted:

  • "<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>/default.d/*.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.

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.

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.

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.

"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"

"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 condenes 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.

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 <joe.user@example.com>
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

"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 change 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 delta against arbitrary revision instead of the previous 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.

"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.

"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

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".

"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 "$HG_LOCAL=0".
"pretxnopen"
Run before any new repository transaction is open. The reason for the transaction will be in "$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 "$HG_TXNNAME", and a unique identifier for the transaction will be in "HG_TXNID". The rest of the available data will vary according the transaction type. New changesets will add "$HG_NODE" (the ID of the first added changeset), "$HG_NODE_LAST" (the ID of the last added changeset), "$HG_URL" and "$HG_SOURCE" variables. Bookmark and phase changes will set "HG_BOOKMARK_MOVED" and "HG_PHASES_MOVED" to "1" respectively, etc.
"pretxnclose-bookmark"
Run right before a bookmark change is actually finalized. Any repository change will be visible to the hook program. This lets you validate the transaction content or change it. Exit status 0 allows the commit to proceed. A non-zero status will cause the transaction to be rolled back. The name of the bookmark will be available in "$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.

(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" or "keep-merge3". 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'). (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 "$labelbase" are "detailed" (respecting "mergemarkertemplate") or "basic". If "premerge" is "keep" or "keep-merge3", the conflict markers generated during premerge will be "detailed" if either this option or the corresponding option in the "[ui]" section is "detailed". (default: "basic")
"mergemarkertemplate"
This setting can be used to override "mergemarkertemplate" from the "[ui]" section on a per-tool basis; this applies to the "$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.

"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 w