830 lines
46 KiB
HTML
830 lines
46 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta name="generator" content="Asciidoctor 1.5.8">
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<title>config API</title>
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic%7CNoto+Serif:400,400italic,700,700italic%7CDroid+Sans+Mono:400,700">
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<style>
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/* Asciidoctor default stylesheet | MIT License | http://asciidoctor.org */
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@media amzn-kf8{#header,#content,#footnotes,#footer{padding:0}}
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</style>
|
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</head>
|
|
<body class="article">
|
|
<div id="header">
|
|
<h1>config API</h1>
|
|
</div>
|
|
<div id="content">
|
|
<div id="preamble">
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>The config API gives callers a way to access Git configuration files
|
|
(and files which have the same syntax). See <a href="git-config.html">git-config</a>(1) for a
|
|
discussion of the config file syntax.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_general_usage">General Usage</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>Config files are parsed linearly, and each variable found is passed to a
|
|
caller-provided callback function. The callback function is responsible
|
|
for any actions to be taken on the config option, and is free to ignore
|
|
some options. It is not uncommon for the configuration to be parsed
|
|
several times during the run of a Git program, with different callbacks
|
|
picking out different variables useful to themselves.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>A config callback function takes three parameters:</p>
|
|
</div>
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p>the name of the parsed variable. This is in canonical "flat" form: the
|
|
section, subsection, and variable segments will be separated by dots,
|
|
and the section and variable segments will be all lowercase. E.g.,
|
|
<code>core.ignorecase</code>, <code>diff.SomeType.textconv</code>.</p>
|
|
</li>
|
|
<li>
|
|
<p>the value of the found variable, as a string. If the variable had no
|
|
value specified, the value will be NULL (typically this means it
|
|
should be interpreted as boolean true).</p>
|
|
</li>
|
|
<li>
|
|
<p>a void pointer passed in by the caller of the config API; this can
|
|
contain callback-specific data</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>A config callback should return 0 for success, or -1 if the variable
|
|
could not be parsed properly.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_basic_config_querying">Basic Config Querying</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>Most programs will simply want to look up variables in all config files
|
|
that Git knows about, using the normal precedence rules. To do this,
|
|
call <code>git_config</code> with a callback function and void data pointer.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p><code>git_config</code> will read all config sources in order of increasing
|
|
priority. Thus a callback should typically overwrite previously-seen
|
|
entries with new ones (e.g., if both the user-wide <code>~/.gitconfig</code> and
|
|
repo-specific <code>.git/config</code> contain <code>color.ui</code>, the config machinery
|
|
will first feed the user-wide one to the callback, and then the
|
|
repo-specific one; by overwriting, the higher-priority repo-specific
|
|
value is left at the end).</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The <code>config_with_options</code> function lets the caller examine config
|
|
while adjusting some of the default behavior of <code>git_config</code>. It should
|
|
almost never be used by "regular" Git code that is looking up
|
|
configuration variables. It is intended for advanced callers like
|
|
<code>git-config</code>, which are intentionally tweaking the normal config-lookup
|
|
process. It takes two extra parameters:</p>
|
|
</div>
|
|
<div class="dlist">
|
|
<dl>
|
|
<dt class="hdlist1"><code>config_source</code></dt>
|
|
<dd>
|
|
<p>If this parameter is non-NULL, it specifies the source to parse for
|
|
configuration, rather than looking in the usual files. See <code>struct
|
|
git_config_source</code> in <code>config.h</code> for details. Regular <code>git_config</code> defaults
|
|
to <code>NULL</code>.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>opts</code></dt>
|
|
<dd>
|
|
<p>Specify options to adjust the behavior of parsing config files. See <code>struct
|
|
config_options</code> in <code>config.h</code> for details. As an example: regular <code>git_config</code>
|
|
sets <code>opts.respect_includes</code> to <code>1</code> by default.</p>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_reading_specific_files">Reading Specific Files</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>To read a specific file in git-config format, use
|
|
<code>git_config_from_file</code>. This takes the same callback and data parameters
|
|
as <code>git_config</code>.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_querying_for_specific_variables">Querying For Specific Variables</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>For programs wanting to query for specific variables in a non-callback
|
|
manner, the config API provides two functions <code>git_config_get_value</code>
|
|
and <code>git_config_get_value_multi</code>. They both read values from an internal
|
|
cache generated previously from reading the config files.</p>
|
|
</div>
|
|
<div class="dlist">
|
|
<dl>
|
|
<dt class="hdlist1"><code>int git_config_get_value(const char *key, const char **value)</code></dt>
|
|
<dd>
|
|
<p>Finds the highest-priority value for the configuration variable <code>key</code>,
|
|
stores the pointer to it in <code>value</code> and returns 0. When the
|
|
configuration variable <code>key</code> is not found, returns 1 without touching
|
|
<code>value</code>. The caller should not free or modify <code>value</code>, as it is owned
|
|
by the cache.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>const struct string_list *git_config_get_value_multi(const char *key)</code></dt>
|
|
<dd>
|
|
<p>Finds and returns the value list, sorted in order of increasing priority
|
|
for the configuration variable <code>key</code>. When the configuration variable
|
|
<code>key</code> is not found, returns NULL. The caller should not free or modify
|
|
the returned pointer, as it is owned by the cache.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>void git_config_clear(void)</code></dt>
|
|
<dd>
|
|
<p>Resets and invalidates the config cache.</p>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>The config API also provides type specific API functions which do conversion
|
|
as well as retrieval for the queried variable, including:</p>
|
|
</div>
|
|
<div class="dlist">
|
|
<dl>
|
|
<dt class="hdlist1"><code>int git_config_get_int(const char *key, int *dest)</code></dt>
|
|
<dd>
|
|
<p>Finds and parses the value to an integer for the configuration variable
|
|
<code>key</code>. Dies on error; otherwise, stores the value of the parsed integer in
|
|
<code>dest</code> and returns 0. When the configuration variable <code>key</code> is not found,
|
|
returns 1 without touching <code>dest</code>.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>int git_config_get_ulong(const char *key, unsigned long *dest)</code></dt>
|
|
<dd>
|
|
<p>Similar to <code>git_config_get_int</code> but for unsigned longs.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>int git_config_get_bool(const char *key, int *dest)</code></dt>
|
|
<dd>
|
|
<p>Finds and parses the value into a boolean value, for the configuration
|
|
variable <code>key</code> respecting keywords like "true" and "false". Integer
|
|
values are converted into true/false values (when they are non-zero or
|
|
zero, respectively). Other values cause a die(). If parsing is successful,
|
|
stores the value of the parsed result in <code>dest</code> and returns 0. When the
|
|
configuration variable <code>key</code> is not found, returns 1 without touching
|
|
<code>dest</code>.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)</code></dt>
|
|
<dd>
|
|
<p>Similar to <code>git_config_get_bool</code>, except that integers are copied as-is,
|
|
and <code>is_bool</code> flag is unset.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>int git_config_get_maybe_bool(const char *key, int *dest)</code></dt>
|
|
<dd>
|
|
<p>Similar to <code>git_config_get_bool</code>, except that it returns -1 on error
|
|
rather than dying.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>int git_config_get_string_const(const char *key, const char **dest)</code></dt>
|
|
<dd>
|
|
<p>Allocates and copies the retrieved string into the <code>dest</code> parameter for
|
|
the configuration variable <code>key</code>; if NULL string is given, prints an
|
|
error message and returns -1. When the configuration variable <code>key</code> is
|
|
not found, returns 1 without touching <code>dest</code>.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>int git_config_get_string(const char *key, char **dest)</code></dt>
|
|
<dd>
|
|
<p>Similar to <code>git_config_get_string_const</code>, except that retrieved value
|
|
copied into the <code>dest</code> parameter is a mutable string.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>int git_config_get_pathname(const char *key, const char **dest)</code></dt>
|
|
<dd>
|
|
<p>Similar to <code>git_config_get_string</code>, but expands <code>~</code> or <code>~user</code> into
|
|
the user’s home directory when found at the beginning of the path.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>git_die_config(const char *key, const char *err, ...)</code></dt>
|
|
<dd>
|
|
<p>First prints the error message specified by the caller in <code>err</code> and then
|
|
dies printing the line number and the file name of the highest priority
|
|
value for the configuration variable <code>key</code>.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>void git_die_config_linenr(const char *key, const char *filename, int linenr)</code></dt>
|
|
<dd>
|
|
<p>Helper function which formats the die error message according to the
|
|
parameters entered. Used by <code>git_die_config()</code>. It can be used by callers
|
|
handling <code>git_config_get_value_multi()</code> to print the correct error message
|
|
for the desired value.</p>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>See test-config.c for usage examples.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_value_parsing_helpers">Value Parsing Helpers</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>To aid in parsing string values, the config API provides callbacks with
|
|
a number of helper functions, including:</p>
|
|
</div>
|
|
<div class="dlist">
|
|
<dl>
|
|
<dt class="hdlist1"><code>git_config_int</code></dt>
|
|
<dd>
|
|
<p>Parse the string to an integer, including unit factors. Dies on error;
|
|
otherwise, returns the parsed result.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>git_config_ulong</code></dt>
|
|
<dd>
|
|
<p>Identical to <code>git_config_int</code>, but for unsigned longs.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>git_config_bool</code></dt>
|
|
<dd>
|
|
<p>Parse a string into a boolean value, respecting keywords like "true" and
|
|
"false". Integer values are converted into true/false values (when they
|
|
are non-zero or zero, respectively). Other values cause a die(). If
|
|
parsing is successful, the return value is the result.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>git_config_bool_or_int</code></dt>
|
|
<dd>
|
|
<p>Same as <code>git_config_bool</code>, except that integers are returned as-is, and
|
|
an <code>is_bool</code> flag is unset.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>git_parse_maybe_bool</code></dt>
|
|
<dd>
|
|
<p>Same as <code>git_config_bool</code>, except that it returns -1 on error rather
|
|
than dying.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>git_config_string</code></dt>
|
|
<dd>
|
|
<p>Allocates and copies the value string into the <code>dest</code> parameter; if no
|
|
string is given, prints an error message and returns -1.</p>
|
|
</dd>
|
|
<dt class="hdlist1"><code>git_config_pathname</code></dt>
|
|
<dd>
|
|
<p>Similar to <code>git_config_string</code>, but expands <code>~</code> or <code>~user</code> into the
|
|
user’s home directory when found at the beginning of the path.</p>
|
|
</dd>
|
|
</dl>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_include_directives">Include Directives</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>By default, the config parser does not respect include directives.
|
|
However, a caller can use the special <code>git_config_include</code> wrapper
|
|
callback to support them. To do so, you simply wrap your "real" callback
|
|
function and data pointer in a <code>struct config_include_data</code>, and pass
|
|
the wrapper to the regular config-reading functions. For example:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>int read_file_with_include(const char *file, config_fn_t fn, void *data)
|
|
{
|
|
struct config_include_data inc = CONFIG_INCLUDE_INIT;
|
|
inc.fn = fn;
|
|
inc.data = data;
|
|
return git_config_from_file(git_config_include, file, &inc);
|
|
}</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p><code>git_config</code> respects includes automatically. The lower-level
|
|
<code>git_config_from_file</code> does not.</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_custom_configsets">Custom Configsets</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>A <code>config_set</code> can be used to construct an in-memory cache for
|
|
config-like files that the caller specifies (i.e., files like <code>.gitmodules</code>,
|
|
<code>~/.gitconfig</code> etc.). For example,</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre>struct config_set gm_config;
|
|
git_configset_init(&gm_config);
|
|
int b;
|
|
/* we add config files to the config_set */
|
|
git_configset_add_file(&gm_config, ".gitmodules");
|
|
git_configset_add_file(&gm_config, ".gitmodules_alt");
|
|
|
|
if (!git_configset_get_bool(gm_config, "submodule.frotz.ignore", &b)) {
|
|
/* hack hack hack */
|
|
}
|
|
|
|
/* when we are done with the configset */
|
|
git_configset_clear(&gm_config);
|
|
----------------------------------------
|
|
|
|
Configset API provides functions for the above mentioned work flow, including:
|
|
|
|
`void git_configset_init(struct config_set *cs)`::
|
|
|
|
Initializes the config_set `cs`.
|
|
|
|
`int git_configset_add_file(struct config_set *cs, const char *filename)`::
|
|
|
|
Parses the file and adds the variable-value pairs to the `config_set`,
|
|
dies if there is an error in parsing the file. Returns 0 on success, or
|
|
-1 if the file does not exist or is inaccessible. The user has to decide
|
|
if he wants to free the incomplete configset or continue using it when
|
|
the function returns -1.
|
|
|
|
`int git_configset_get_value(struct config_set *cs, const char *key, const char **value)`::
|
|
|
|
Finds the highest-priority value for the configuration variable `key`
|
|
and config set `cs`, stores the pointer to it in `value` and returns 0.
|
|
When the configuration variable `key` is not found, returns 1 without
|
|
touching `value`. The caller should not free or modify `value`, as it
|
|
is owned by the cache.
|
|
|
|
`const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)`::
|
|
|
|
Finds and returns the value list, sorted in order of increasing priority
|
|
for the configuration variable `key` and config set `cs`. When the
|
|
configuration variable `key` is not found, returns NULL. The caller
|
|
should not free or modify the returned pointer, as it is owned by the cache.
|
|
|
|
`void git_configset_clear(struct config_set *cs)`::
|
|
|
|
Clears `config_set` structure, removes all saved variable-value pairs.
|
|
|
|
In addition to above functions, the `config_set` API provides type specific
|
|
functions in the vein of `git_config_get_int` and family but with an extra
|
|
parameter, pointer to struct `config_set`.
|
|
They all behave similarly to the `git_config_get*()` family described in
|
|
"Querying For Specific Variables" above.
|
|
|
|
Writing Config Files
|
|
--------------------
|
|
|
|
Git gives multiple entry points in the Config API to write config values to
|
|
files namely `git_config_set_in_file` and `git_config_set`, which write to
|
|
a specific config file or to `.git/config` respectively. They both take a
|
|
key/value pair as parameter.
|
|
In the end they both call `git_config_set_multivar_in_file` which takes four
|
|
parameters:
|
|
|
|
- the name of the file, as a string, to which key/value pairs will be written.
|
|
|
|
- the name of key, as a string. This is in canonical "flat" form: the section,
|
|
subsection, and variable segments will be separated by dots, and the section
|
|
and variable segments will be all lowercase.
|
|
E.g., `core.ignorecase`, `diff.SomeType.textconv`.
|
|
|
|
- the value of the variable, as a string. If value is equal to NULL, it will
|
|
remove the matching key from the config file.
|
|
|
|
- the value regex, as a string. It will disregard key/value pairs where value
|
|
does not match.
|
|
|
|
- a multi_replace value, as an int. If value is equal to zero, nothing or only
|
|
one matching key/value is replaced, else all matching key/values (regardless
|
|
how many) are removed, before the new pair is written.
|
|
|
|
It returns 0 on success.
|
|
|
|
Also, there are functions `git_config_rename_section` and
|
|
`git_config_rename_section_in_file` with parameters `old_name` and `new_name`
|
|
for renaming or removing sections in the config files. If NULL is passed
|
|
through `new_name` parameter, the section will be removed from the config file.</pre>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div id="footer">
|
|
<div id="footer-text">
|
|
Last updated 2019-02-26 19:31:11 UTC
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html> |