diff options
Diffstat (limited to 'config.h')
| -rw-r--r-- | config.h | 565 |
1 files changed, 503 insertions, 62 deletions
@@ -3,6 +3,23 @@ #include "hashmap.h" #include "string-list.h" +#include "repository.h" +#include "parse.h" + +/** + * The config API gives callers a way to access Git configuration files + * (and files which have the same syntax). + * + * General Usage + * ------------- + * + * 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. + */ struct object_id; @@ -19,13 +36,26 @@ struct object_id; #define CONFIG_REGEX_NONE ((void *)1) +enum config_scope { + CONFIG_SCOPE_UNKNOWN = 0, + CONFIG_SCOPE_SYSTEM, + CONFIG_SCOPE_GLOBAL, + CONFIG_SCOPE_LOCAL, + CONFIG_SCOPE_WORKTREE, + CONFIG_SCOPE_COMMAND, + CONFIG_SCOPE_SUBMODULE, +}; +const char *config_scope_name(enum config_scope scope); + struct git_config_source { unsigned int use_stdin:1; const char *file; const char *blob; + enum config_scope scope; }; enum config_origin_type { + CONFIG_ORIGIN_UNKNOWN = 0, CONFIG_ORIGIN_BLOB, CONFIG_ORIGIN_FILE, CONFIG_ORIGIN_STDIN, @@ -42,6 +72,7 @@ enum config_event_t { CONFIG_EVENT_ERROR }; +struct config_source; /* * The parser event function (if not NULL) is called with the event type and * the begin/end offsets of the parsed elements. @@ -51,6 +82,7 @@ enum config_event_t { */ typedef int (*config_parser_event_fn_t)(enum config_event_t type, size_t begin_offset, size_t end_offset, + struct config_source *cs, void *event_fn_data); struct config_options { @@ -59,8 +91,21 @@ struct config_options { unsigned int ignore_worktree : 1; unsigned int ignore_cmdline : 1; unsigned int system_gently : 1; + + /* + * For internal use. Include all includeif.hasremoteurl paths without + * checking if the repo has that remote URL, and when doing so, verify + * that files included in this way do not configure any remote URLs + * themselves. + */ + unsigned int unconditional_remote_url : 1; + const char *commondir; const char *git_dir; + /* + * event_fn and event_fn_data are for internal use only. Handles events + * emitted by the config parser. + */ config_parser_event_fn_t event_fn; void *event_fn_data; enum config_error_action { @@ -71,85 +116,281 @@ struct config_options { } error_action; }; -typedef int (*config_fn_t)(const char *, const char *, void *); -int git_default_config(const char *, const char *, void *); +/* Config source metadata for a given config key-value pair */ +struct key_value_info { + const char *filename; + int linenr; + enum config_origin_type origin_type; + enum config_scope scope; + const char *path; +}; +#define KVI_INIT { \ + .filename = NULL, \ + .linenr = -1, \ + .origin_type = CONFIG_ORIGIN_UNKNOWN, \ + .scope = CONFIG_SCOPE_UNKNOWN, \ + .path = NULL, \ +} + +/* Captures additional information that a config callback can use. */ +struct config_context { + /* Config source metadata for key and value. */ + const struct key_value_info *kvi; +}; +#define CONFIG_CONTEXT_INIT { 0 } + +/** + * A config callback function takes four parameters: + * + * - 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., + * `core.ignorecase`, `diff.SomeType.textconv`. + * + * - 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). + * + * - the 'config context', that is, additional information about the config + * iteration operation provided by the config machinery. For example, this + * includes information about the config source being parsed (e.g. the + * filename). + * + * - a void pointer passed in by the caller of the config API; this can + * contain callback-specific data + * + * A config callback should return 0 for success, or -1 if the variable + * could not be parsed properly. + */ +typedef int (*config_fn_t)(const char *, const char *, + const struct config_context *, void *); + +int git_default_config(const char *, const char *, + const struct config_context *, void *); + +/** + * Read a specific file in git-config format. + * This function takes the same callback and data parameters as `git_config`. + * + * Unlike git_config(), this function does not respect includes. + */ int git_config_from_file(config_fn_t fn, const char *, void *); + int git_config_from_file_with_options(config_fn_t fn, const char *, - void *, + void *, enum config_scope, const struct config_options *); int git_config_from_mem(config_fn_t fn, const enum config_origin_type, const char *name, const char *buf, size_t len, - void *data, const struct config_options *opts); + void *data, enum config_scope scope, + const struct config_options *opts); int git_config_from_blob_oid(config_fn_t fn, const char *name, - const struct object_id *oid, void *data); + struct repository *repo, + const struct object_id *oid, void *data, + enum config_scope scope); void git_config_push_parameter(const char *text); +void git_config_push_env(const char *spec); int git_config_from_parameters(config_fn_t fn, void *data); void read_early_config(config_fn_t cb, void *data); void read_very_early_config(config_fn_t cb, void *data); + +/** + * 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 `git_config` with a callback function and void data pointer. + * + * `git_config` 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 `~/.gitconfig` and + * repo-specific `.git/config` contain `color.ui`, 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). + * + * Unlike git_config_from_file(), this function respects includes. + */ void git_config(config_fn_t fn, void *); + +/** + * Lets the caller examine config while adjusting some of the default + * behavior of `git_config`. It should almost never be used by "regular" + * Git code that is looking up configuration variables. + * It is intended for advanced callers like `git-config`, which are + * intentionally tweaking the normal config-lookup process. + * It takes two extra parameters: + * + * - `config_source` + * If this parameter is non-NULL, it specifies the source to parse for + * configuration, rather than looking in the usual files. See `struct + * git_config_source` in `config.h` for details. Regular `git_config` defaults + * to `NULL`. + * + * - `opts` + * Specify options to adjust the behavior of parsing config files. See `struct + * config_options` in `config.h` for details. As an example: regular `git_config` + * sets `opts.respect_includes` to `1` by default. + */ int config_with_options(config_fn_t fn, void *, struct git_config_source *config_source, + struct repository *repo, const struct config_options *opts); -int git_parse_ssize_t(const char *, ssize_t *); -int git_parse_ulong(const char *, unsigned long *); -int git_parse_maybe_bool(const char *); -int git_config_int(const char *, const char *); -int64_t git_config_int64(const char *, const char *); -unsigned long git_config_ulong(const char *, const char *); -ssize_t git_config_ssize_t(const char *, const char *); -int git_config_bool_or_int(const char *, const char *, int *); + +/** + * Value Parsing Helpers + * --------------------- + * + * The following helper functions aid in parsing string values + */ + +/** + * Parse the string to an integer, including unit factors. Dies on error; + * otherwise, returns the parsed result. + */ +int git_config_int(const char *, const char *, const struct key_value_info *); + +int64_t git_config_int64(const char *, const char *, + const struct key_value_info *); + +/** + * Identical to `git_config_int`, but for unsigned longs. + */ +unsigned long git_config_ulong(const char *, const char *, + const struct key_value_info *); + +ssize_t git_config_ssize_t(const char *, const char *, + const struct key_value_info *); + +/** + * Same as `git_config_bool`, except that integers are returned as-is, and + * an `is_bool` flag is unset. + */ +int git_config_bool_or_int(const char *, const char *, + const struct key_value_info *, int *); + +/** + * 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. + */ int git_config_bool(const char *, const char *); + +/** + * Allocates and copies the value string into the `dest` parameter; if no + * string is given, prints an error message and returns -1. + */ int git_config_string(const char **, const char *, const char *); + +/** + * Similar to `git_config_string`, but expands `~` or `~user` into the + * user's home directory when found at the beginning of the path. + */ int git_config_pathname(const char **, const char *, const char *); + int git_config_expiry_date(timestamp_t *, const char *, const char *); int git_config_color(char *, const char *, const char *); -int git_config_set_in_file_gently(const char *, const char *, const char *); +int git_config_set_in_file_gently(const char *, const char *, const char *, const char *); + +/** + * write config values to a specific config file, takes a key/value pair as + * parameter. + */ void git_config_set_in_file(const char *, const char *, const char *); + int git_config_set_gently(const char *, const char *); + +/** + * Write a config value that should apply to the current worktree. If + * extensions.worktreeConfig is enabled, then the write will happen in the + * current worktree's config. Otherwise, write to the common config file. + */ +int repo_config_set_worktree_gently(struct repository *, const char *, const char *); + +/** + * write config values to `.git/config`, takes a key/value pair as parameter. + */ void git_config_set(const char *, const char *); -int git_config_parse_key(const char *, char **, int *); -int git_config_key_is_valid(const char *key); -int git_config_set_multivar_gently(const char *, const char *, const char *, int); -void git_config_set_multivar(const char *, const char *, const char *, int); -int git_config_set_multivar_in_file_gently(const char *, const char *, const char *, const char *, int); -void git_config_set_multivar_in_file(const char *, const char *, const char *, const char *, int); + +int git_config_parse_key(const char *, char **, size_t *); + +/* + * The following macros specify flag bits that alter the behavior + * of the git_config_set_multivar*() methods. + */ + +/* + * When CONFIG_FLAGS_MULTI_REPLACE is specified, all matching key/values + * are removed before a single new pair is written. If the flag is not + * present, then set operations replace only the first match. + */ +#define CONFIG_FLAGS_MULTI_REPLACE (1 << 0) + +/* + * When CONFIG_FLAGS_FIXED_VALUE is specified, match key/value pairs + * by string comparison (not regex match) to the provided value_pattern + * parameter. + */ +#define CONFIG_FLAGS_FIXED_VALUE (1 << 1) + +int git_config_set_multivar_gently(const char *, const char *, const char *, unsigned); +void git_config_set_multivar(const char *, const char *, const char *, unsigned); +int repo_config_set_multivar_gently(struct repository *, const char *, const char *, const char *, unsigned); +int git_config_set_multivar_in_file_gently(const char *, const char *, const char *, const char *, const char *, unsigned); + +const char *git_config_prepare_comment_string(const char *); + +/** + * 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 flags value with bits corresponding to the CONFIG_FLAG_* macros. + * + * It returns 0 on success. + */ +void git_config_set_multivar_in_file(const char *config_filename, + const char *key, + const char *value, + const char *value_pattern, + unsigned flags); + +/** + * rename or remove sections in the config file + * parameters `old_name` and `new_name` + * If NULL is passed through `new_name` parameter, + * the section will be removed from the config file. + */ int git_config_rename_section(const char *, const char *); + int git_config_rename_section_in_file(const char *, const char *, const char *); int git_config_copy_section(const char *, const char *); int git_config_copy_section_in_file(const char *, const char *, const char *); -const char *git_etc_gitconfig(void); -int git_env_bool(const char *, int); -unsigned long git_env_ulong(const char *, unsigned long); int git_config_system(void); int config_error_nonbool(const char *); #if defined(__GNUC__) #define config_error_nonbool(s) (config_error_nonbool(s), const_error()) #endif -int git_config_parse_parameter(const char *, config_fn_t fn, void *data); +char *git_system_config(void); +char *git_global_config(void); +void git_global_config_paths(char **user, char **xdg); -enum config_scope { - CONFIG_SCOPE_UNKNOWN = 0, - CONFIG_SCOPE_SYSTEM, - CONFIG_SCOPE_GLOBAL, - CONFIG_SCOPE_REPO, - CONFIG_SCOPE_CMDLINE, -}; +int git_config_parse_parameter(const char *, config_fn_t fn, void *data); -enum config_scope current_config_scope(void); -const char *current_config_origin_type(void); -const char *current_config_name(void); - -struct config_include_data { - int depth; - config_fn_t fn; - void *data; - const struct config_options *opts; -}; -#define CONFIG_INCLUDE_INIT { 0 } -int git_config_include(const char *name, const char *value, void *data); +const char *config_origin_type_name(enum config_origin_type type); +void kvi_from_param(struct key_value_info *out); /* * Match and parse a config key of the form: @@ -166,9 +407,36 @@ int git_config_include(const char *name, const char *value, void *data); */ int parse_config_key(const char *var, const char *section, - const char **subsection, int *subsection_len, + const char **subsection, size_t *subsection_len, const char **key); +/** + * Custom Configsets + * ----------------- + * + * A `config_set` can be used to construct an in-memory cache for + * config-like files that the caller specifies (i.e., files like `.gitmodules`, + * `~/.gitconfig` etc.). For example, + * + * ---------------------------------------- + * 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 + */ + struct config_set_element { struct hashmap_entry ent; char *key; @@ -197,17 +465,76 @@ struct config_set { struct configset_list list; }; +/** + * Initializes the config_set `cs`. + */ void git_configset_init(struct config_set *cs); + +/** + * 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 caller decides + * whether to free the incomplete configset or continue using it when + * the function returns -1. + */ int git_configset_add_file(struct config_set *cs, const char *filename); -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 1 without touching + * `value`. + * + * The key will be parsed for validity with git_config_parse_key(), on + * error a negative value will be returned. + * + * The caller should not free or modify the returned pointer, as it is + * owned by the cache. + */ +RESULT_MUST_BE_USED +int git_configset_get_value_multi(struct config_set *cs, const char *key, + const struct string_list **dest); + +/** + * A validation wrapper for git_configset_get_value_multi() which does + * for it what git_configset_get_string() does for + * git_configset_get_value(). + * + * The configuration syntax allows for "[section] key", which will + * give us a NULL entry in the "struct string_list", as opposed to + * "[section] key =" which is the empty string. Most users of the API + * are not prepared to handle NULL in a "struct string_list". + */ +int git_configset_get_string_multi(struct config_set *cs, const char *key, + const struct string_list **dest); + +/** + * Clears `config_set` structure, removes all saved variable-value pairs. + */ void git_configset_clear(struct config_set *cs); /* * These functions return 1 if not found, and 0 if found, leaving the found * value in the 'dest' pointer. */ -int git_configset_get_value(struct config_set *cs, const char *key, const char **dest); -int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest); + +/** + * git_configset_get() returns negative values on error, see + * repo_config_get() below. + */ +RESULT_MUST_BE_USED +int git_configset_get(struct config_set *cs, const char *key); + +/* + * 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. + */ +int git_configset_get_value(struct config_set *cs, const char *key, + const char **dest, struct key_value_info *kvi); + int git_configset_get_string(struct config_set *cs, const char *key, char **dest); int git_configset_get_int(struct config_set *cs, const char *key, int *dest); int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest); @@ -219,14 +546,26 @@ int git_configset_get_pathname(struct config_set *cs, const char *key, const cha /* Functions for reading a repository's config */ struct repository; void repo_config(struct repository *repo, config_fn_t fn, void *data); + +/** + * Run only the discover part of the repo_config_get_*() functions + * below, in addition to 1 if not found, returns negative values on + * error (e.g. if the key itself is invalid). + */ +RESULT_MUST_BE_USED +int repo_config_get(struct repository *repo, const char *key); int repo_config_get_value(struct repository *repo, const char *key, const char **value); -const struct string_list *repo_config_get_value_multi(struct repository *repo, - const char *key); -int repo_config_get_string_const(struct repository *repo, - const char *key, const char **dest); +RESULT_MUST_BE_USED +int repo_config_get_value_multi(struct repository *repo, const char *key, + const struct string_list **dest); +RESULT_MUST_BE_USED +int repo_config_get_string_multi(struct repository *repo, const char *key, + const struct string_list **dest); int repo_config_get_string(struct repository *repo, const char *key, char **dest); +int repo_config_get_string_tmp(struct repository *repo, + const char *key, const char **dest); int repo_config_get_int(struct repository *repo, const char *key, int *dest); int repo_config_get_ulong(struct repository *repo, @@ -240,22 +579,119 @@ int repo_config_get_maybe_bool(struct repository *repo, int repo_config_get_pathname(struct repository *repo, const char *key, const char **dest); +/* + * Functions for reading protected config. By definition, protected + * config ignores repository config, so these do not take a `struct + * repository` parameter. + */ +void git_protected_config(config_fn_t fn, void *data); + +/** + * Querying For Specific Variables + * ------------------------------- + * + * For programs wanting to query for specific variables in a non-callback + * manner, the config API provides two functions `git_config_get_value` + * and `git_config_get_value_multi`. They both read values from an internal + * cache generated previously from reading the config files. + * + * For those git_config_get*() functions that aren't documented, + * consult the corresponding repo_config_get*() function's + * documentation. + */ + +RESULT_MUST_BE_USED +int git_config_get(const char *key); + +/** + * Finds the highest-priority value for the configuration variable `key`, + * 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. + */ int git_config_get_value(const char *key, const char **value); -const struct string_list *git_config_get_value_multi(const char *key); + +/** + * Finds and returns the value list, sorted in order of increasing priority + * for the configuration variable `key`. When the configuration variable + * `key` is not found, returns 1 without touching `value`. + * + * The caller should not free or modify the returned pointer, as it is + * owned by the cache. + */ +RESULT_MUST_BE_USED +int git_config_get_value_multi(const char *key, + const struct string_list **dest); +RESULT_MUST_BE_USED +int git_config_get_string_multi(const char *key, + const struct string_list **dest); + +/** + * Resets and invalidates the config cache. + */ void git_config_clear(void); -int git_config_get_string_const(const char *key, const char **dest); + +/** + * Allocates and copies the retrieved string into the `dest` parameter for + * the configuration variable `key`; if NULL string is given, prints an + * error message and returns -1. When the configuration variable `key` is + * not found, returns 1 without touching `dest`. + */ int git_config_get_string(const char *key, char **dest); + +/** + * Similar to `git_config_get_string`, but does not allocate any new + * memory; on success `dest` will point to memory owned by the config + * machinery, which could be invalidated if it is discarded and reloaded. + */ +int git_config_get_string_tmp(const char *key, const char **dest); + +/** + * Finds and parses the value to an integer for the configuration variable + * `key`. Dies on error; otherwise, stores the value of the parsed integer in + * `dest` and returns 0. When the configuration variable `key` is not found, + * returns 1 without touching `dest`. + */ int git_config_get_int(const char *key, int *dest); + +/** + * Similar to `git_config_get_int` but for unsigned longs. + */ int git_config_get_ulong(const char *key, unsigned long *dest); + +/** + * Finds and parses the value into a boolean value, for the configuration + * variable `key` 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 `dest` and returns 0. When the + * configuration variable `key` is not found, returns 1 without touching + * `dest`. + */ int git_config_get_bool(const char *key, int *dest); + +/** + * Similar to `git_config_get_bool`, except that integers are copied as-is, + * and `is_bool` flag is unset. + */ int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest); + +/** + * Similar to `git_config_get_bool`, except that it returns -1 on error + * rather than dying. + */ int git_config_get_maybe_bool(const char *key, int *dest); + +/** + * Similar to `git_config_get_string`, but expands `~` or `~user` into + * the user's home directory when found at the beginning of the path. + */ int git_config_get_pathname(const char *key, const char **dest); + int git_config_get_index_threads(int *dest); -int git_config_get_untracked_cache(void); int git_config_get_split_index(void); int git_config_get_max_percent_split_change(void); -int git_config_get_fsmonitor(void); /* This dies if the configured or default date is in the future */ int git_config_get_expiry(const char *key, const char **output); @@ -263,14 +699,19 @@ int git_config_get_expiry(const char *key, const char **output); /* parse either "this many days" integer, or "5.days.ago" approxidate */ int git_config_get_expiry_in_days(const char *key, timestamp_t *, timestamp_t now); -struct key_value_info { - const char *filename; - int linenr; - enum config_origin_type origin_type; - enum config_scope scope; -}; - +/** + * First prints the error message specified by the caller in `err` and then + * dies printing the line number and the file name of the highest priority + * value for the configuration variable `key`. + */ NORETURN void git_die_config(const char *key, const char *err, ...) __attribute__((format(printf, 2, 3))); + +/** + * Helper function which formats the die error message according to the + * parameters entered. Used by `git_die_config()`. It can be used by callers + * handling `git_config_get_value_multi()` to print the correct error message + * for the desired value. + */ NORETURN void git_die_config_linenr(const char *key, const char *filename, int linenr); #define LOOKUP_CONFIG(mapping, var) \ |