builtin/config: refactor collect_config()

[thirdparty/git.git] / Documentation / git-config.txt

git-config(1)
=============

NAME
----
git-config - Get and set repository or global options


SYNOPSIS
--------
[verse]
'git config' [<file-option>] [type] [-z|--null] name [value [value_regex]]
'git config' [<file-option>] [type] --add name value
'git config' [<file-option>] [type] --replace-all name value [value_regex]
'git config' [<file-option>] [type] [-z|--null] --get name [value_regex]
'git config' [<file-option>] [type] [-z|--null] --get-all name [value_regex]
'git config' [<file-option>] [type] [-z|--null] --get-regexp name_regex [value_regex]
'git config' [<file-option>] --unset name [value_regex]
'git config' [<file-option>] --unset-all name [value_regex]
'git config' [<file-option>] --rename-section old_name new_name
'git config' [<file-option>] --remove-section name
'git config' [<file-option>] [-z|--null] -l | --list
'git config' [<file-option>] --get-color name [default]
'git config' [<file-option>] --get-colorbool name [stdout-is-tty]
'git config' [<file-option>] -e | --edit

DESCRIPTION
-----------
You can query/set/replace/unset options with this command. The name is
actually the section and the key separated by a dot, and the value will be
escaped.

Multiple lines can be added to an option by using the '--add' option.
If you want to update or unset an option which can occur on multiple
lines, a POSIX regexp `value_regex` needs to be given.  Only the
existing values that match the regexp are updated or unset.  If
you want to handle the lines that do *not* match the regex, just
prepend a single exclamation mark in front (see also <<EXAMPLES>>).

The type specifier can be either '--int' or '--bool', to make
'git config' ensure that the variable(s) are of the given type and
convert the value to the canonical form (simple decimal number for int,
a "true" or "false" string for bool), or '--path', which does some
path expansion (see '--path' below).  If no type specifier is passed, no
checks or transformations are performed on the value.

When reading, the values are read from the system, global and
repository local configuration files by default, and options
'--system', '--global', '--local' and '--file <filename>' can be
used to tell the command to read from only that location (see <<FILES>>).

When writing, the new value is written to the repository local
configuration file by default, and options '--system', '--global',
'--file <filename>' can be used to tell the command to write to
that location (you can say '--local' but that is the default).

This command will fail with non-zero status upon error.  Some exit
codes are:

. The config file is invalid (ret=3),
. can not write to the config file (ret=4),
. no section or name was provided (ret=2),
. the section or key is invalid (ret=1),
. you try to unset an option which does not exist (ret=5),
. you try to unset/set an option for which multiple lines match (ret=5), or
. you try to use an invalid regexp (ret=6).

On success, the command returns the exit code 0.

OPTIONS
-------

--replace-all::
	Default behavior is to replace at most one line. This replaces
	all lines matching the key (and optionally the value_regex).

--add::
	Adds a new line to the option without altering any existing
	values.  This is the same as providing '^$' as the value_regex
	in `--replace-all`.

--get::
	Get the value for a given key (optionally filtered by a regex
	matching the value). Returns error code 1 if the key was not
	found and error code 2 if multiple key values were found.

--get-all::
	Like get, but does not fail if the number of values for the key
	is not exactly one.

--get-regexp::
	Like --get-all, but interprets the name as a regular expression and
	writes out the key names.  Regular expression matching is currently
	case-sensitive and done against a canonicalized version of the key
	in which section and variable names are lowercased, but subsection
	names are not.

--global::
	For writing options: write to global ~/.gitconfig file rather than
	the repository .git/config, write to $XDG_CONFIG_HOME/git/config file
	if this file exists and the ~/.gitconfig file doesn't.
+
For reading options: read only from global ~/.gitconfig and from
$XDG_CONFIG_HOME/git/config rather than from all available files.
+
See also <<FILES>>.

--system::
	For writing options: write to system-wide $(prefix)/etc/gitconfig
	rather than the repository .git/config.
+
For reading options: read only from system-wide $(prefix)/etc/gitconfig
rather than from all available files.
+
See also <<FILES>>.

-f config-file::
--file config-file::
	Use the given config file instead of the one specified by GIT_CONFIG.

--remove-section::
	Remove the given section from the configuration file.

--rename-section::
	Rename the given section to a new name.

--unset::
	Remove the line matching the key from config file.

--unset-all::
	Remove all lines matching the key from config file.

-l::
--list::
	List all variables set in config file.

--bool::
	'git config' will ensure that the output is "true" or "false"

--int::
	'git config' will ensure that the output is a simple
	decimal number.  An optional value suffix of 'k', 'm', or 'g'
	in the config file will cause the value to be multiplied
	by 1024, 1048576, or 1073741824 prior to output.

--bool-or-int::
	'git config' will ensure that the output matches the format of
	either --bool or --int, as described above.

--path::
	'git-config' will expand leading '{tilde}' to the value of
	'$HOME', and '{tilde}user' to the home directory for the
	specified user.  This option has no effect when setting the
	value (but you can use 'git config bla {tilde}/' from the
	command line to let your shell do the expansion).

-z::
--null::
	For all options that output values and/or keys, always
	end values with the null character (instead of a
	newline). Use newline instead as a delimiter between
	key and value. This allows for secure parsing of the
	output without getting confused e.g. by values that
	contain line breaks.

--get-colorbool name [stdout-is-tty]::

	Find the color setting for `name` (e.g. `color.diff`) and output
	"true" or "false".  `stdout-is-tty` should be either "true" or
	"false", and is taken into account when configuration says
	"auto".  If `stdout-is-tty` is missing, then checks the standard
	output of the command itself, and exits with status 0 if color
	is to be used, or exits with status 1 otherwise.
	When the color setting for `name` is undefined, the command uses
	`color.ui` as fallback.

--get-color name [default]::

	Find the color configured for `name` (e.g. `color.diff.new`) and
	output it as the ANSI color escape sequence to the standard
	output.  The optional `default` parameter is used instead, if
	there is no color configured for `name`.

-e::
--edit::
	Opens an editor to modify the specified config file; either
	'--system', '--global', or repository (default).

--[no-]includes::
	Respect `include.*` directives in config files when looking up
	values. Defaults to on.

[[FILES]]
FILES
-----

If not set explicitly with '--file', there are four files where
'git config' will search for configuration options:

$GIT_DIR/config::
	Repository specific configuration file.

~/.gitconfig::
	User-specific configuration file. Also called "global"
	configuration file.

$XDG_CONFIG_HOME/git/config::
	Second user-specific configuration file. If $XDG_CONFIG_HOME is not set
	or empty, $HOME/.config/git/config will be used. Any single-valued
	variable set in this file will be overwritten by whatever is in
	~/.gitconfig.  It is a good idea not to create this file if
	you sometimes use older versions of Git, as support for this
	file was added fairly recently.

$(prefix)/etc/gitconfig::
	System-wide configuration file.

If no further options are given, all reading options will read all of these
files that are available. If the global or the system-wide configuration
file are not available they will be ignored. If the repository configuration
file is not available or readable, 'git config' will exit with a non-zero
error code. However, in neither case will an error message be issued.

All writing options will per default write to the repository specific
configuration file. Note that this also affects options like '--replace-all'
and '--unset'. *'git config' will only ever change one file at a time*.

You can override these rules either by command line options or by environment
variables. The '--global' and the '--system' options will limit the file used
to the global or system-wide file respectively. The GIT_CONFIG environment
variable has a similar effect, but you can specify any filename you want.


ENVIRONMENT
-----------

GIT_CONFIG::
	Take the configuration from the given file instead of .git/config.
	Using the "--global" option forces this to ~/.gitconfig. Using the
	"--system" option forces this to $(prefix)/etc/gitconfig.

GIT_CONFIG_NOSYSTEM::
	Whether to skip reading settings from the system-wide
	$(prefix)/etc/gitconfig file. See linkgit:git[1] for details.

See also <<FILES>>.


[[EXAMPLES]]
EXAMPLES
--------

Given a .git/config like this:

	#
	# This is the config file, and
	# a '#' or ';' character indicates
	# a comment
	#

	; core variables
	[core]
		; Don't trust file modes
		filemode = false

	; Our diff algorithm
	[diff]
		external = /usr/local/bin/diff-wrapper
		renames = true

	; Proxy settings
	[core]
		gitproxy=proxy-command for kernel.org
		gitproxy=default-proxy ; for all the rest

you can set the filemode to true with

------------
% git config core.filemode true
------------

The hypothetical proxy command entries actually have a postfix to discern
what URL they apply to. Here is how to change the entry for kernel.org
to "ssh".

------------
% git config core.gitproxy '"ssh" for kernel.org' 'for kernel.org$'
------------

This makes sure that only the key/value pair for kernel.org is replaced.

To delete the entry for renames, do

------------
% git config --unset diff.renames
------------

If you want to delete an entry for a multivar (like core.gitproxy above),
you have to provide a regex matching the value of exactly one line.

To query the value for a given key, do

------------
% git config --get core.filemode
------------

or

------------
% git config core.filemode
------------

or, to query a multivar:

------------
% git config --get core.gitproxy "for kernel.org$"
------------

If you want to know all the values for a multivar, do:

------------
% git config --get-all core.gitproxy
------------

If you like to live dangerously, you can replace *all* core.gitproxy by a
new one with

------------
% git config --replace-all core.gitproxy ssh
------------

However, if you really only want to replace the line for the default proxy,
i.e. the one without a "for ..." postfix, do something like this:

------------
% git config core.gitproxy ssh '! for '
------------

To actually match only values with an exclamation mark, you have to

------------
% git config section.key value '[!]'
------------

To add a new proxy, without altering any of the existing ones, use

------------
% git config --add core.gitproxy '"proxy-command" for example.com'
------------

An example to use customized color from the configuration in your
script:

------------
#!/bin/sh
WS=$(git config --get-color color.diff.whitespace "blue reverse")
RESET=$(git config --get-color "" "reset")
echo "${WS}your whitespace color or blue reverse${RESET}"
------------

include::config.txt[]

GIT
---
Part of the linkgit:git[1] suite