Adding upstream version 1.7.2+ds.upstream/1.7.2+ds

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 782 insertions, 0 deletions

diff --git a/include/git2/config.h b/include/git2/config.h
new file mode 100644
index 0000000..cfab0c7
--- /dev/null
+++ b/include/git2/config.h
@@ -0,0 +1,782 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+#ifndef INCLUDE_git_config_h__
+#define INCLUDE_git_config_h__
+
+#include "common.h"
+#include "types.h"
+#include "buffer.h"
+
+/**
+ * @file git2/config.h
+ * @brief Git config management routines
+ * @defgroup git_config Git config management routines
+ * @ingroup Git
+ * @{
+ */
+GIT_BEGIN_DECL
+
+/**
+ * Priority level of a config file.
+ * These priority levels correspond to the natural escalation logic
+ * (from higher to lower) when searching for config entries in git.git.
+ *
+ * git_config_open_default() and git_repository_config() honor those
+ * priority levels as well.
+ */
+typedef enum {
+	/** System-wide on Windows, for compatibility with portable git */
+	GIT_CONFIG_LEVEL_PROGRAMDATA = 1,
+
+	/** System-wide configuration file; /etc/gitconfig on Linux systems */
+	GIT_CONFIG_LEVEL_SYSTEM = 2,
+
+	/** XDG compatible configuration file; typically ~/.config/git/config */
+	GIT_CONFIG_LEVEL_XDG = 3,
+
+	/** User-specific configuration file (also called Global configuration
+	 * file); typically ~/.gitconfig
+	 */
+	GIT_CONFIG_LEVEL_GLOBAL = 4,
+
+	/** Repository specific configuration file; $WORK_DIR/.git/config on
+	 * non-bare repos
+	 */
+	GIT_CONFIG_LEVEL_LOCAL = 5,
+
+	/** Application specific configuration file; freely defined by applications
+	 */
+	GIT_CONFIG_LEVEL_APP = 6,
+
+	/** Represents the highest level available config file (i.e. the most
+	 * specific config file available that actually is loaded)
+	 */
+	GIT_CONFIG_HIGHEST_LEVEL = -1
+} git_config_level_t;
+
+/**
+ * An entry in a configuration file
+ */
+typedef struct git_config_entry {
+	const char *name; /**< Name of the entry (normalised) */
+	const char *value; /**< String value of the entry */
+	unsigned int include_depth; /**< Depth of includes where this variable was found */
+	git_config_level_t level; /**< Which config file this was found in */
+	void GIT_CALLBACK(free)(struct git_config_entry *entry); /**< Free function for this entry */
+	void *payload; /**< Opaque value for the free function. Do not read or write */
+} git_config_entry;
+
+/**
+ * Free a config entry
+ *
+ * @param entry The entry to free.
+ */
+GIT_EXTERN(void) git_config_entry_free(git_config_entry *entry);
+
+/**
+ * A config enumeration callback
+ *
+ * @param entry the entry currently being enumerated
+ * @param payload a user-specified pointer
+ * @return non-zero to terminate the iteration.
+ */
+typedef int GIT_CALLBACK(git_config_foreach_cb)(const git_config_entry *entry, void *payload);
+
+/**
+ * An opaque structure for a configuration iterator
+ */
+typedef struct git_config_iterator git_config_iterator;
+
+/**
+ * Config var type
+ */
+typedef enum {
+	GIT_CONFIGMAP_FALSE = 0,
+	GIT_CONFIGMAP_TRUE = 1,
+	GIT_CONFIGMAP_INT32,
+	GIT_CONFIGMAP_STRING
+} git_configmap_t;
+
+/**
+ * Mapping from config variables to values.
+ */
+typedef struct {
+	git_configmap_t type;
+	const char *str_match;
+	int map_value;
+} git_configmap;
+
+/**
+ * Locate the path to the global configuration file
+ *
+ * The user or global configuration file is usually
+ * located in `$HOME/.gitconfig`.
+ *
+ * This method will try to guess the full path to that
+ * file, if the file exists. The returned path
+ * may be used on any `git_config` call to load the
+ * global configuration file.
+ *
+ * This method will not guess the path to the xdg compatible
+ * config file (`.config/git/config`).
+ *
+ * @param out Pointer to a user-allocated git_buf in which to store the path
+ * @return 0 if a global configuration file has been found. Its path will be stored in `out`.
+ */
+GIT_EXTERN(int) git_config_find_global(git_buf *out);
+
+/**
+ * Locate the path to the global xdg compatible configuration file
+ *
+ * The xdg compatible configuration file is usually
+ * located in `$HOME/.config/git/config`.
+ *
+ * This method will try to guess the full path to that
+ * file, if the file exists. The returned path
+ * may be used on any `git_config` call to load the
+ * xdg compatible configuration file.
+ *
+ * @param out Pointer to a user-allocated git_buf in which to store the path
+ * @return 0 if a xdg compatible configuration file has been
+ *	found. Its path will be stored in `out`.
+ */
+GIT_EXTERN(int) git_config_find_xdg(git_buf *out);
+
+/**
+ * Locate the path to the system configuration file
+ *
+ * If `/etc/gitconfig` doesn't exist, it will look for
+ * `%PROGRAMFILES%\Git\etc\gitconfig`.
+ *
+ * @param out Pointer to a user-allocated git_buf in which to store the path
+ * @return 0 if a system configuration file has been
+ *	found. Its path will be stored in `out`.
+ */
+GIT_EXTERN(int) git_config_find_system(git_buf *out);
+
+/**
+ * Locate the path to the configuration file in ProgramData
+ *
+ * Look for the file in `%PROGRAMDATA%\Git\config` used by portable git.
+ *
+ * @param out Pointer to a user-allocated git_buf in which to store the path
+ * @return 0 if a ProgramData configuration file has been
+ *	found. Its path will be stored in `out`.
+ */
+GIT_EXTERN(int) git_config_find_programdata(git_buf *out);
+
+/**
+ * Open the global, XDG and system configuration files
+ *
+ * Utility wrapper that finds the global, XDG and system configuration files
+ * and opens them into a single prioritized config object that can be
+ * used when accessing default config data outside a repository.
+ *
+ * @param out Pointer to store the config instance
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_config_open_default(git_config **out);
+
+/**
+ * Allocate a new configuration object
+ *
+ * This object is empty, so you have to add a file to it before you
+ * can do anything with it.
+ *
+ * @param out pointer to the new configuration
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_config_new(git_config **out);
+
+/**
+ * Add an on-disk config file instance to an existing config
+ *
+ * The on-disk file pointed at by `path` will be opened and
+ * parsed; it's expected to be a native Git config file following
+ * the default Git config syntax (see man git-config).
+ *
+ * If the file does not exist, the file will still be added and it
+ * will be created the first time we write to it.
+ *
+ * Note that the configuration object will free the file
+ * automatically.
+ *
+ * Further queries on this config object will access each
+ * of the config file instances in order (instances with
+ * a higher priority level will be accessed first).
+ *
+ * @param cfg the configuration to add the file to
+ * @param path path to the configuration file to add
+ * @param level the priority level of the backend
+ * @param force replace config file at the given priority level
+ * @param repo optional repository to allow parsing of
+ *  conditional includes
+ * @return 0 on success, GIT_EEXISTS when adding more than one file
+ *  for a given priority level (and force_replace set to 0),
+ *  GIT_ENOTFOUND when the file doesn't exist or error code
+ */
+GIT_EXTERN(int) git_config_add_file_ondisk(
+	git_config *cfg,
+	const char *path,
+	git_config_level_t level,
+	const git_repository *repo,
+	int force);
+
+/**
+ * Create a new config instance containing a single on-disk file
+ *
+ * This method is a simple utility wrapper for the following sequence
+ * of calls:
+ *	- git_config_new
+ *	- git_config_add_file_ondisk
+ *
+ * @param out The configuration instance to create
+ * @param path Path to the on-disk file to open
+ * @return 0 on success, or an error code
+ */
+GIT_EXTERN(int) git_config_open_ondisk(git_config **out, const char *path);
+
+/**
+ * Build a single-level focused config object from a multi-level one.
+ *
+ * The returned config object can be used to perform get/set/delete operations
+ * on a single specific level.
+ *
+ * Getting several times the same level from the same parent multi-level config
+ * will return different config instances, but containing the same config_file
+ * instance.
+ *
+ * @param out The configuration instance to create
+ * @param parent Multi-level config to search for the given level
+ * @param level Configuration level to search for
+ * @return 0, GIT_ENOTFOUND if the passed level cannot be found in the
+ * multi-level parent config, or an error code
+ */
+GIT_EXTERN(int) git_config_open_level(
+	git_config **out,
+	const git_config *parent,
+	git_config_level_t level);
+
+/**
+ * Open the global/XDG configuration file according to git's rules
+ *
+ * Git allows you to store your global configuration at
+ * `$HOME/.gitconfig` or `$XDG_CONFIG_HOME/git/config`. For backwards
+ * compatibility, the XDG file shouldn't be used unless the use has
+ * created it explicitly. With this function you'll open the correct
+ * one to write to.
+ *
+ * @param out pointer in which to store the config object
+ * @param config the config object in which to look
+ * @return 0 or an error code.
+ */
+GIT_EXTERN(int) git_config_open_global(git_config **out, git_config *config);
+
+/**
+ * Create a snapshot of the configuration
+ *
+ * Create a snapshot of the current state of a configuration, which
+ * allows you to look into a consistent view of the configuration for
+ * looking up complex values (e.g. a remote, submodule).
+ *
+ * The string returned when querying such a config object is valid
+ * until it is freed.
+ *
+ * @param out pointer in which to store the snapshot config object
+ * @param config configuration to snapshot
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_config_snapshot(git_config **out, git_config *config);
+
+/**
+ * Free the configuration and its associated memory and files
+ *
+ * @param cfg the configuration to free
+ */
+GIT_EXTERN(void) git_config_free(git_config *cfg);
+
+/**
+ * Get the git_config_entry of a config variable.
+ *
+ * Free the git_config_entry after use with `git_config_entry_free()`.
+ *
+ * @param out pointer to the variable git_config_entry
+ * @param cfg where to look for the variable
+ * @param name the variable's name
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_config_get_entry(
+	git_config_entry **out,
+	const git_config *cfg,
+	const char *name);
+
+/**
+ * Get the value of an integer config variable.
+ *
+ * All config files will be looked into, in the order of their
+ * defined level. A higher level means a higher priority. The
+ * first occurrence of the variable will be returned here.
+ *
+ * @param out pointer to the variable where the value should be stored
+ * @param cfg where to look for the variable
+ * @param name the variable's name
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_config_get_int32(int32_t *out, const git_config *cfg, const char *name);
+
+/**
+ * Get the value of a long integer config variable.
+ *
+ * All config files will be looked into, in the order of their
+ * defined level. A higher level means a higher priority. The
+ * first occurrence of the variable will be returned here.
+ *
+ * @param out pointer to the variable where the value should be stored
+ * @param cfg where to look for the variable
+ * @param name the variable's name
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_config_get_int64(int64_t *out, const git_config *cfg, const char *name);
+
+/**
+ * Get the value of a boolean config variable.
+ *
+ * This function uses the usual C convention of 0 being false and
+ * anything else true.
+ *
+ * All config files will be looked into, in the order of their
+ * defined level. A higher level means a higher priority. The
+ * first occurrence of the variable will be returned here.
+ *
+ * @param out pointer to the variable where the value should be stored
+ * @param cfg where to look for the variable
+ * @param name the variable's name
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_config_get_bool(int *out, const git_config *cfg, const char *name);
+
+/**
+ * Get the value of a path config variable.
+ *
+ * A leading '~' will be expanded to the global search path (which
+ * defaults to the user's home directory but can be overridden via
+ * `git_libgit2_opts()`.
+ *
+ * All config files will be looked into, in the order of their
+ * defined level. A higher level means a higher priority. The
+ * first occurrence of the variable will be returned here.
+ *
+ * @param out the buffer in which to store the result
+ * @param cfg where to look for the variable
+ * @param name the variable's name
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_config_get_path(git_buf *out, const git_config *cfg, const char *name);
+
+/**
+ * Get the value of a string config variable.
+ *
+ * This function can only be used on snapshot config objects. The
+ * string is owned by the config and should not be freed by the
+ * user. The pointer will be valid until the config is freed.
+ *
+ * All config files will be looked into, in the order of their
+ * defined level. A higher level means a higher priority. The
+ * first occurrence of the variable will be returned here.
+ *
+ * @param out pointer to the string
+ * @param cfg where to look for the variable
+ * @param name the variable's name
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_config_get_string(const char **out, const git_config *cfg, const char *name);
+
+/**
+ * Get the value of a string config variable.
+ *
+ * The value of the config will be copied into the buffer.
+ *
+ * All config files will be looked into, in the order of their
+ * defined level. A higher level means a higher priority. The
+ * first occurrence of the variable will be returned here.
+ *
+ * @param out buffer in which to store the string
+ * @param cfg where to look for the variable
+ * @param name the variable's name
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_config_get_string_buf(git_buf *out, const git_config *cfg, const char *name);
+
+/**
+ * Get each value of a multivar in a foreach callback
+ *
+ * The callback will be called on each variable found
+ *
+ * The regular expression is applied case-sensitively on the normalized form of
+ * the variable name: the section and variable parts are lower-cased. The
+ * subsection is left unchanged.
+ *
+ * @param cfg where to look for the variable
+ * @param name the variable's name
+ * @param regexp regular expression to filter which variables we're
+ * interested in. Use NULL to indicate all
+ * @param callback the function to be called on each value of the variable
+ * @param payload opaque pointer to pass to the callback
+ * @return 0 or an error code.
+ */
+GIT_EXTERN(int) git_config_get_multivar_foreach(const git_config *cfg, const char *name, const char *regexp, git_config_foreach_cb callback, void *payload);
+
+/**
+ * Get each value of a multivar
+ *
+ * The regular expression is applied case-sensitively on the normalized form of
+ * the variable name: the section and variable parts are lower-cased. The
+ * subsection is left unchanged.
+ *
+ * @param out pointer to store the iterator
+ * @param cfg where to look for the variable
+ * @param name the variable's name
+ * @param regexp regular expression to filter which variables we're
+ * interested in. Use NULL to indicate all
+ * @return 0 or an error code.
+ */
+GIT_EXTERN(int) git_config_multivar_iterator_new(git_config_iterator **out, const git_config *cfg, const char *name, const char *regexp);
+
+/**
+ * Return the current entry and advance the iterator
+ *
+ * The pointers returned by this function are valid until the next call
+ * to `git_config_next` or until the iterator is freed.
+ *
+ * @param entry pointer to store the entry
+ * @param iter the iterator
+ * @return 0 or an error code. GIT_ITEROVER if the iteration has completed
+ */
+GIT_EXTERN(int) git_config_next(git_config_entry **entry, git_config_iterator *iter);
+
+/**
+ * Free a config iterator
+ *
+ * @param iter the iterator to free
+ */
+GIT_EXTERN(void) git_config_iterator_free(git_config_iterator *iter);
+
+/**
+ * Set the value of an integer config variable in the config file
+ * with the highest level (usually the local one).
+ *
+ * @param cfg where to look for the variable
+ * @param name the variable's name
+ * @param value Integer value for the variable
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_config_set_int32(git_config *cfg, const char *name, int32_t value);
+
+/**
+ * Set the value of a long integer config variable in the config file
+ * with the highest level (usually the local one).
+ *
+ * @param cfg where to look for the variable
+ * @param name the variable's name
+ * @param value Long integer value for the variable
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_config_set_int64(git_config *cfg, const char *name, int64_t value);
+
+/**
+ * Set the value of a boolean config variable in the config file
+ * with the highest level (usually the local one).
+ *
+ * @param cfg where to look for the variable
+ * @param name the variable's name
+ * @param value the value to store
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_config_set_bool(git_config *cfg, const char *name, int value);
+
+/**
+ * Set the value of a string config variable in the config file
+ * with the highest level (usually the local one).
+ *
+ * A copy of the string is made and the user is free to use it
+ * afterwards.
+ *
+ * @param cfg where to look for the variable
+ * @param name the variable's name
+ * @param value the string to store.
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_config_set_string(git_config *cfg, const char *name, const char *value);
+
+/**
+ * Set a multivar in the local config file.
+ *
+ * The regular expression is applied case-sensitively on the value.
+ *
+ * @param cfg where to look for the variable
+ * @param name the variable's name
+ * @param regexp a regular expression to indicate which values to replace
+ * @param value the new value.
+ * @return 0 or an error code.
+ */
+GIT_EXTERN(int) git_config_set_multivar(git_config *cfg, const char *name, const char *regexp, const char *value);
+
+/**
+ * Delete a config variable from the config file
+ * with the highest level (usually the local one).
+ *
+ * @param cfg the configuration
+ * @param name the variable to delete
+ * @return 0 or an error code.
+ */
+GIT_EXTERN(int) git_config_delete_entry(git_config *cfg, const char *name);
+
+/**
+ * Deletes one or several entries from a multivar in the local config file.
+ *
+ * The regular expression is applied case-sensitively on the value.
+ *
+ * @param cfg where to look for the variables
+ * @param name the variable's name
+ * @param regexp a regular expression to indicate which values to delete
+ *
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_config_delete_multivar(git_config *cfg, const char *name, const char *regexp);
+
+/**
+ * Perform an operation on each config variable.
+ *
+ * The callback receives the normalized name and value of each variable
+ * in the config backend, and the data pointer passed to this function.
+ * If the callback returns a non-zero value, the function stops iterating
+ * and returns that value to the caller.
+ *
+ * The pointers passed to the callback are only valid as long as the
+ * iteration is ongoing.
+ *
+ * @param cfg where to get the variables from
+ * @param callback the function to call on each variable
+ * @param payload the data to pass to the callback
+ * @return 0 on success, non-zero callback return value, or error code
+ */
+GIT_EXTERN(int) git_config_foreach(
+	const git_config *cfg,
+	git_config_foreach_cb callback,
+	void *payload);
+
+/**
+ * Iterate over all the config variables
+ *
+ * Use `git_config_next` to advance the iteration and
+ * `git_config_iterator_free` when done.
+ *
+ * @param out pointer to store the iterator
+ * @param cfg where to get the variables from
+ * @return 0 or an error code.
+ */
+GIT_EXTERN(int) git_config_iterator_new(git_config_iterator **out, const git_config *cfg);
+
+/**
+ * Iterate over all the config variables whose name matches a pattern
+ *
+ * Use `git_config_next` to advance the iteration and
+ * `git_config_iterator_free` when done.
+ *
+ * The regular expression is applied case-sensitively on the normalized form of
+ * the variable name: the section and variable parts are lower-cased. The
+ * subsection is left unchanged.
+ *
+ * @param out pointer to store the iterator
+ * @param cfg where to ge the variables from
+ * @param regexp regular expression to match the names
+ * @return 0 or an error code.
+ */
+GIT_EXTERN(int) git_config_iterator_glob_new(git_config_iterator **out, const git_config *cfg, const char *regexp);
+
+/**
+ * Perform an operation on each config variable matching a regular expression.
+ *
+ * This behaves like `git_config_foreach` with an additional filter of a
+ * regular expression that filters which config keys are passed to the
+ * callback.
+ *
+ * The regular expression is applied case-sensitively on the normalized form of
+ * the variable name: the section and variable parts are lower-cased. The
+ * subsection is left unchanged.
+ *
+ * The regular expression is applied case-sensitively on the normalized form of
+ * the variable name: the case-insensitive parts are lower-case.
+ *
+ * @param cfg where to get the variables from
+ * @param regexp regular expression to match against config names
+ * @param callback the function to call on each variable
+ * @param payload the data to pass to the callback
+ * @return 0 or the return value of the callback which didn't return 0
+ */
+GIT_EXTERN(int) git_config_foreach_match(
+	const git_config *cfg,
+	const char *regexp,
+	git_config_foreach_cb callback,
+	void *payload);
+
+/**
+ * Query the value of a config variable and return it mapped to
+ * an integer constant.
+ *
+ * This is a helper method to easily map different possible values
+ * to a variable to integer constants that easily identify them.
+ *
+ * A mapping array looks as follows:
+ *
+ *	git_configmap autocrlf_mapping[] = {
+ *		{GIT_CVAR_FALSE, NULL, GIT_AUTO_CRLF_FALSE},
+ *		{GIT_CVAR_TRUE, NULL, GIT_AUTO_CRLF_TRUE},
+ *		{GIT_CVAR_STRING, "input", GIT_AUTO_CRLF_INPUT},
+ *		{GIT_CVAR_STRING, "default", GIT_AUTO_CRLF_DEFAULT}};
+ *
+ * On any "false" value for the variable (e.g. "false", "FALSE", "no"), the
+ * mapping will store `GIT_AUTO_CRLF_FALSE` in the `out` parameter.
+ *
+ * The same thing applies for any "true" value such as "true", "yes" or "1", storing
+ * the `GIT_AUTO_CRLF_TRUE` variable.
+ *
+ * Otherwise, if the value matches the string "input" (with case insensitive comparison),
+ * the given constant will be stored in `out`, and likewise for "default".
+ *
+ * If not a single match can be made to store in `out`, an error code will be
+ * returned.
+ *
+ * @param out place to store the result of the mapping
+ * @param cfg config file to get the variables from
+ * @param name name of the config variable to lookup
+ * @param maps array of `git_configmap` objects specifying the possible mappings
+ * @param map_n number of mapping objects in `maps`
+ * @return 0 on success, error code otherwise
+ */
+GIT_EXTERN(int) git_config_get_mapped(
+	int *out,
+	const git_config *cfg,
+	const char *name,
+	const git_configmap *maps,
+	size_t map_n);
+
+/**
+ * Maps a string value to an integer constant
+ *
+ * @param out place to store the result of the parsing
+ * @param maps array of `git_configmap` objects specifying the possible mappings
+ * @param map_n number of mapping objects in `maps`
+ * @param value value to parse
+ * @return 0 or an error code.
+ */
+GIT_EXTERN(int) git_config_lookup_map_value(
+	int *out,
+	const git_configmap *maps,
+	size_t map_n,
+	const char *value);
+
+/**
+ * Parse a string value as a bool.
+ *
+ * Valid values for true are: 'true', 'yes', 'on', 1 or any
+ *  number different from 0
+ * Valid values for false are: 'false', 'no', 'off', 0
+ *
+ * @param out place to store the result of the parsing
+ * @param value value to parse
+ * @return 0 or an error code.
+ */
+GIT_EXTERN(int) git_config_parse_bool(int *out, const char *value);
+
+/**
+ * Parse a string value as an int32.
+ *
+ * An optional value suffix of 'k', 'm', or 'g' will
+ * cause the value to be multiplied by 1024, 1048576,
+ * or 1073741824 prior to output.
+ *
+ * @param out place to store the result of the parsing
+ * @param value value to parse
+ * @return 0 or an error code.
+ */
+GIT_EXTERN(int) git_config_parse_int32(int32_t *out, const char *value);
+
+/**
+ * Parse a string value as an int64.
+ *
+ * An optional value suffix of 'k', 'm', or 'g' will
+ * cause the value to be multiplied by 1024, 1048576,
+ * or 1073741824 prior to output.
+ *
+ * @param out place to store the result of the parsing
+ * @param value value to parse
+ * @return 0 or an error code.
+ */
+GIT_EXTERN(int) git_config_parse_int64(int64_t *out, const char *value);
+
+/**
+ * Parse a string value as a path.
+ *
+ * A leading '~' will be expanded to the global search path (which
+ * defaults to the user's home directory but can be overridden via
+ * `git_libgit2_opts()`.
+ *
+ * If the value does not begin with a tilde, the input will be
+ * returned.
+ *
+ * @param out placae to store the result of parsing
+ * @param value the path to evaluate
+ * @return 0 or an error code.
+ */
+GIT_EXTERN(int) git_config_parse_path(git_buf *out, const char *value);
+
+/**
+ * Perform an operation on each config variable in a given config backend,
+ * matching a regular expression.
+ *
+ * This behaves like `git_config_foreach_match` except that only config
+ * entries from the given backend entry are enumerated.
+ *
+ * The regular expression is applied case-sensitively on the normalized form of
+ * the variable name: the section and variable parts are lower-cased. The
+ * subsection is left unchanged.
+ *
+ * @param backend where to get the variables from
+ * @param regexp regular expression to match against config names (can be NULL)
+ * @param callback the function to call on each variable
+ * @param payload the data to pass to the callback
+ * @return 0 or an error code.
+ */
+GIT_EXTERN(int) git_config_backend_foreach_match(
+	git_config_backend *backend,
+	const char *regexp,
+	git_config_foreach_cb callback,
+	void *payload);
+
+
+/**
+ * Lock the backend with the highest priority
+ *
+ * Locking disallows anybody else from writing to that backend. Any
+ * updates made after locking will not be visible to a reader until
+ * the file is unlocked.
+ *
+ * You can apply the changes by calling `git_transaction_commit()`
+ * before freeing the transaction. Either of these actions will unlock
+ * the config.
+ *
+ * @param tx the resulting transaction, use this to commit or undo the
+ * changes
+ * @param cfg the configuration in which to lock
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_config_lock(git_transaction **tx, git_config *cfg);
+
+/** @} */
+GIT_END_DECL
+#endif