config.h

   1 #ifndef CONFIG_H
   2 #define CONFIG_H
   3
   4 #include "hashmap.h"
   5 #include "string-list.h"
   6
   7
   8 /**
   9  * The config API gives callers a way to access Git configuration files
  10  * (and files which have the same syntax).
  11  *
  12  * General Usage
  13  * -------------
  14  *
  15  * Config files are parsed linearly, and each variable found is passed to a
  16  * caller-provided callback function. The callback function is responsible
  17  * for any actions to be taken on the config option, and is free to ignore
  18  * some options. It is not uncommon for the configuration to be parsed
  19  * several times during the run of a Git program, with different callbacks
  20  * picking out different variables useful to themselves.
  21  */
  22
  23 struct object_id;
  24
  25 /* git_config_parse_key() returns these negated: */
  26 #define CONFIG_INVALID_KEY 1
  27 #define CONFIG_NO_SECTION_OR_NAME 2
  28 /* git_config_set_gently(), git_config_set_multivar_gently() return the above or these: */
  29 #define CONFIG_NO_LOCK -1
  30 #define CONFIG_INVALID_FILE 3
  31 #define CONFIG_NO_WRITE 4
  32 #define CONFIG_NOTHING_SET 5
  33 #define CONFIG_INVALID_PATTERN 6
  34 #define CONFIG_GENERIC_ERROR 7
  35
  36 #define CONFIG_REGEX_NONE ((void *)1)
  37
  38 struct git_config_source {
  39         unsigned int use_stdin:1;
  40         const char *file;
  41         const char *blob;
  42 };
  43
  44 enum config_origin_type {
  45         CONFIG_ORIGIN_BLOB,
  46         CONFIG_ORIGIN_FILE,
  47         CONFIG_ORIGIN_STDIN,
  48         CONFIG_ORIGIN_SUBMODULE_BLOB,
  49         CONFIG_ORIGIN_CMDLINE
  50 };
  51
  52 enum config_event_t {
  53         CONFIG_EVENT_SECTION,
  54         CONFIG_EVENT_ENTRY,
  55         CONFIG_EVENT_WHITESPACE,
  56         CONFIG_EVENT_COMMENT,
  57         CONFIG_EVENT_EOF,
  58         CONFIG_EVENT_ERROR
  59 };
  60
  61 /*
  62  * The parser event function (if not NULL) is called with the event type and
  63  * the begin/end offsets of the parsed elements.
  64  *
  65  * Note: for CONFIG_EVENT_ENTRY (i.e. config variables), the trailing newline
  66  * character is considered part of the element.
  67  */
  68 typedef int (*config_parser_event_fn_t)(enum config_event_t type,
  69                                         size_t begin_offset, size_t end_offset,
  70                                         void *event_fn_data);
  71
  72 struct config_options {
  73         unsigned int respect_includes : 1;
  74         unsigned int ignore_repo : 1;
  75         unsigned int ignore_worktree : 1;
  76         unsigned int ignore_cmdline : 1;
  77         unsigned int system_gently : 1;
  78         const char *commondir;
  79         const char *git_dir;
  80         config_parser_event_fn_t event_fn;
  81         void *event_fn_data;
  82         enum config_error_action {
  83                 CONFIG_ERROR_UNSET = 0, /* use source-specific default */
  84                 CONFIG_ERROR_DIE, /* die() on error */
  85                 CONFIG_ERROR_ERROR, /* error() on error, return -1 */
  86                 CONFIG_ERROR_SILENT, /* return -1 */
  87         } error_action;
  88 };
  89
  90 /**
  91  * A config callback function takes three parameters:
  92  *
  93  * - the name of the parsed variable. This is in canonical "flat" form: the
  94  *   section, subsection, and variable segments will be separated by dots,
  95  *   and the section and variable segments will be all lowercase. E.g.,
  96  *   `core.ignorecase`, `diff.SomeType.textconv`.
  97  *
  98  * - the value of the found variable, as a string. If the variable had no
  99  *   value specified, the value will be NULL (typically this means it
 100  *   should be interpreted as boolean true).
 101  *
 102  * - a void pointer passed in by the caller of the config API; this can
 103  *   contain callback-specific data
 104  *
 105  * A config callback should return 0 for success, or -1 if the variable
 106  * could not be parsed properly.
 107  */
 108 typedef int (*config_fn_t)(const char *, const char *, void *);
 109
 110 int git_default_config(const char *, const char *, void *);
 111
 112 /**
 113  * Read a specific file in git-config format.
 114  * This function takes the same callback and data parameters as `git_config`.
 115  */
 116 int git_config_from_file(config_fn_t fn, const char *, void *);
 117
 118 int git_config_from_file_with_options(config_fn_t fn, const char *,
 119                                       void *,
 120                                       const struct config_options *);
 121 int git_config_from_mem(config_fn_t fn,
 122                         const enum config_origin_type,
 123                         const char *name,
 124                         const char *buf, size_t len,
 125                         void *data, const struct config_options *opts);
 126 int git_config_from_blob_oid(config_fn_t fn, const char *name,
 127                              const struct object_id *oid, void *data);
 128 void git_config_push_parameter(const char *text);
 129 int git_config_from_parameters(config_fn_t fn, void *data);
 130 void read_early_config(config_fn_t cb, void *data);
 131 void read_very_early_config(config_fn_t cb, void *data);
 132
 133 /**
 134  * Most programs will simply want to look up variables in all config files
 135  * that Git knows about, using the normal precedence rules. To do this,
 136  * call `git_config` with a callback function and void data pointer.
 137  *
 138  * `git_config` will read all config sources in order of increasing
 139  * priority. Thus a callback should typically overwrite previously-seen
 140  * entries with new ones (e.g., if both the user-wide `~/.gitconfig` and
 141  * repo-specific `.git/config` contain `color.ui`, the config machinery
 142  * will first feed the user-wide one to the callback, and then the
 143  * repo-specific one; by overwriting, the higher-priority repo-specific
 144  * value is left at the end).
 145  */
 146 void git_config(config_fn_t fn, void *);
 147
 148 /**
 149  * Lets the caller examine config while adjusting some of the default
 150  * behavior of `git_config`. It should almost never be used by "regular"
 151  * Git code that is looking up configuration variables.
 152  * It is intended for advanced callers like `git-config`, which are
 153  * intentionally tweaking the normal config-lookup process.
 154  * It takes two extra parameters:
 155  *
 156  * - `config_source`
 157  * If this parameter is non-NULL, it specifies the source to parse for
 158  * configuration, rather than looking in the usual files. See `struct
 159  * git_config_source` in `config.h` for details. Regular `git_config` defaults
 160  * to `NULL`.
 161  *
 162  * - `opts`
 163  * Specify options to adjust the behavior of parsing config files. See `struct
 164  * config_options` in `config.h` for details. As an example: regular `git_config`
 165  * sets `opts.respect_includes` to `1` by default.
 166  */
 167 int config_with_options(config_fn_t fn, void *,
 168                         struct git_config_source *config_source,
 169                         const struct config_options *opts);
 170
 171 /**
 172  * Value Parsing Helpers
 173  * ---------------------
 174  *
 175  * The following helper functions aid in parsing string values
 176  */
 177
 178 int git_parse_ssize_t(const char *, ssize_t *);
 179 int git_parse_ulong(const char *, unsigned long *);
 180
 181 /**
 182  * Same as `git_config_bool`, except that it returns -1 on error rather
 183  * than dying.
 184  */
 185 int git_parse_maybe_bool(const char *);
 186
 187 /**
 188  * Parse the string to an integer, including unit factors. Dies on error;
 189  * otherwise, returns the parsed result.
 190  */
 191 int git_config_int(const char *, const char *);
 192
 193 int64_t git_config_int64(const char *, const char *);
 194
 195 /**
 196  * Identical to `git_config_int`, but for unsigned longs.
 197  */
 198 unsigned long git_config_ulong(const char *, const char *);
 199
 200 ssize_t git_config_ssize_t(const char *, const char *);
 201
 202 /**
 203  * Same as `git_config_bool`, except that integers are returned as-is, and
 204  * an `is_bool` flag is unset.
 205  */
 206 int git_config_bool_or_int(const char *, const char *, int *);
 207
 208 /**
 209  * Parse a string into a boolean value, respecting keywords like "true" and
 210  * "false". Integer values are converted into true/false values (when they
 211  * are non-zero or zero, respectively). Other values cause a die(). If
 212  * parsing is successful, the return value is the result.
 213  */
 214 int git_config_bool(const char *, const char *);
 215
 216 /**
 217  * Allocates and copies the value string into the `dest` parameter; if no
 218  * string is given, prints an error message and returns -1.
 219  */
 220 int git_config_string(const char **, const char *, const char *);
 221
 222 /**
 223  * Similar to `git_config_string`, but expands `~` or `~user` into the
 224  * user's home directory when found at the beginning of the path.
 225  */
 226 int git_config_pathname(const char **, const char *, const char *);
 227
 228 int git_config_expiry_date(timestamp_t *, const char *, const char *);
 229 int git_config_color(char *, const char *, const char *);
 230 int git_config_set_in_file_gently(const char *, const char *, const char *);
 231
 232 /**
 233  * write config values to a specific config file, takes a key/value pair as
 234  * parameter.
 235  */
 236 void git_config_set_in_file(const char *, const char *, const char *);
 237
 238 int git_config_set_gently(const char *, const char *);
 239
 240 /**
 241  * write config values to `.git/config`, takes a key/value pair as parameter.
 242  */
 243 void git_config_set(const char *, const char *);
 244
 245 int git_config_parse_key(const char *, char **, int *);
 246 int git_config_key_is_valid(const char *key);
 247 int git_config_set_multivar_gently(const char *, const char *, const char *, int);
 248 void git_config_set_multivar(const char *, const char *, const char *, int);
 249 int git_config_set_multivar_in_file_gently(const char *, const char *, const char *, const char *, int);
 250
 251 /**
 252  * takes four parameters:
 253  *
 254  * - the name of the file, as a string, to which key/value pairs will be written.
 255  *
 256  * - the name of key, as a string. This is in canonical "flat" form: the section,
 257  *   subsection, and variable segments will be separated by dots, and the section
 258  *   and variable segments will be all lowercase.
 259  *   E.g., `core.ignorecase`, `diff.SomeType.textconv`.
 260  *
 261  * - the value of the variable, as a string. If value is equal to NULL, it will
 262  *   remove the matching key from the config file.
 263  *
 264  * - the value regex, as a string. It will disregard key/value pairs where value
 265  *   does not match.
 266  *
 267  * - a multi_replace value, as an int. If value is equal to zero, nothing or only
 268  *   one matching key/value is replaced, else all matching key/values (regardless
 269  *   how many) are removed, before the new pair is written.
 270  *
 271  * It returns 0 on success.
 272  */
 273 void git_config_set_multivar_in_file(const char *, const char *, const char *, const char *, int);
 274
 275 /**
 276  * rename or remove sections in the config file
 277  * parameters `old_name` and `new_name`
 278  * If NULL is passed through `new_name` parameter,
 279  * the section will be removed from the config file.
 280  */
 281 int git_config_rename_section(const char *, const char *);
 282
 283 int git_config_rename_section_in_file(const char *, const char *, const char *);
 284 int git_config_copy_section(const char *, const char *);
 285 int git_config_copy_section_in_file(const char *, const char *, const char *);
 286 const char *git_etc_gitconfig(void);
 287 int git_env_bool(const char *, int);
 288 unsigned long git_env_ulong(const char *, unsigned long);
 289 int git_config_system(void);
 290 int config_error_nonbool(const char *);
 291 #if defined(__GNUC__)
 292 #define config_error_nonbool(s) (config_error_nonbool(s), const_error())
 293 #endif
 294
 295 int git_config_parse_parameter(const char *, config_fn_t fn, void *data);
 296
 297 enum config_scope {
 298         CONFIG_SCOPE_UNKNOWN = 0,
 299         CONFIG_SCOPE_SYSTEM,
 300         CONFIG_SCOPE_GLOBAL,
 301         CONFIG_SCOPE_REPO,
 302         CONFIG_SCOPE_CMDLINE,
 303 };
 304
 305 enum config_scope current_config_scope(void);
 306 const char *current_config_origin_type(void);
 307 const char *current_config_name(void);
 308
 309 /**
 310  * Include Directives
 311  * ------------------
 312  *
 313  * By default, the config parser does not respect include directives.
 314  * However, a caller can use the special `git_config_include` wrapper
 315  * callback to support them. To do so, you simply wrap your "real" callback
 316  * function and data pointer in a `struct config_include_data`, and pass
 317  * the wrapper to the regular config-reading functions. For example:
 318  *
 319  * -------------------------------------------
 320  * int read_file_with_include(const char *file, config_fn_t fn, void *data)
 321  * {
 322  * struct config_include_data inc = CONFIG_INCLUDE_INIT;
 323  * inc.fn = fn;
 324  * inc.data = data;
 325  * return git_config_from_file(git_config_include, file, &inc);
 326  * }
 327  * -------------------------------------------
 328  *
 329  * `git_config` respects includes automatically. The lower-level
 330  * `git_config_from_file` does not.
 331  *
 332  */
 333 struct config_include_data {
 334         int depth;
 335         config_fn_t fn;
 336         void *data;
 337         const struct config_options *opts;
 338 };
 339 #define CONFIG_INCLUDE_INIT { 0 }
 340 int git_config_include(const char *name, const char *value, void *data);
 341
 342 /*
 343  * Match and parse a config key of the form:
 344  *
 345  *   section.(subsection.)?key
 346  *
 347  * (i.e., what gets handed to a config_fn_t). The caller provides the section;
 348  * we return -1 if it does not match, 0 otherwise. The subsection and key
 349  * out-parameters are filled by the function (and *subsection is NULL if it is
 350  * missing).
 351  *
 352  * If the subsection pointer-to-pointer passed in is NULL, returns 0 only if
 353  * there is no subsection at all.
 354  */
 355 int parse_config_key(const char *var,
 356                      const char *section,
 357                      const char **subsection, int *subsection_len,
 358                      const char **key);
 359
 360 /**
 361  * Custom Configsets
 362  * -----------------
 363  *
 364  * A `config_set` can be used to construct an in-memory cache for
 365  * config-like files that the caller specifies (i.e., files like `.gitmodules`,
 366  * `~/.gitconfig` etc.). For example,
 367  *
 368  * ----------------------------------------
 369  * struct config_set gm_config;
 370  * git_configset_init(&gm_config);
 371  * int b;
 372  * //we add config files to the config_set
 373  * git_configset_add_file(&gm_config, ".gitmodules");
 374  * git_configset_add_file(&gm_config, ".gitmodules_alt");
 375  *
 376  * if (!git_configset_get_bool(gm_config, "submodule.frotz.ignore", &b)) {
 377  * //hack hack hack
 378  * }
 379  *
 380  * when we are done with the configset:
 381  * git_configset_clear(&gm_config);
 382  * ----------------------------------------
 383  *
 384  * Configset API provides functions for the above mentioned work flow
 385  */
 386
 387 struct config_set_element {
 388         struct hashmap_entry ent;
 389         char *key;
 390         struct string_list value_list;
 391 };
 392
 393 struct configset_list_item {
 394         struct config_set_element *e;
 395         int value_index;
 396 };
 397
 398 /*
 399  * the contents of the list are ordered according to their
 400  * position in the config files and order of parsing the files.
 401  * (i.e. key-value pair at the last position of .git/config will
 402  * be at the last item of the list)
 403  */
 404 struct configset_list {
 405         struct configset_list_item *items;
 406         unsigned int nr, alloc;
 407 };
 408
 409 struct config_set {
 410         struct hashmap config_hash;
 411         int hash_initialized;
 412         struct configset_list list;
 413 };
 414
 415 /**
 416  * Initializes the config_set `cs`.
 417  */
 418 void git_configset_init(struct config_set *cs);
 419
 420 /**
 421  * Parses the file and adds the variable-value pairs to the `config_set`,
 422  * dies if there is an error in parsing the file. Returns 0 on success, or
 423  * -1 if the file does not exist or is inaccessible. The user has to decide
 424  * if he wants to free the incomplete configset or continue using it when
 425  * the function returns -1.
 426  */
 427 int git_configset_add_file(struct config_set *cs, const char *filename);
 428
 429 /**
 430  * Finds and returns the value list, sorted in order of increasing priority
 431  * for the configuration variable `key` and config set `cs`. When the
 432  * configuration variable `key` is not found, returns NULL. The caller
 433  * should not free or modify the returned pointer, as it is owned by the cache.
 434  */
 435 const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key);
 436
 437 /**
 438  * Clears `config_set` structure, removes all saved variable-value pairs.
 439  */
 440 void git_configset_clear(struct config_set *cs);
 441
 442 /*
 443  * These functions return 1 if not found, and 0 if found, leaving the found
 444  * value in the 'dest' pointer.
 445  */
 446
 447 /*
 448  * Finds the highest-priority value for the configuration variable `key`
 449  * and config set `cs`, stores the pointer to it in `value` and returns 0.
 450  * When the configuration variable `key` is not found, returns 1 without
 451  * touching `value`. The caller should not free or modify `value`, as it
 452  * is owned by the cache.
 453  */
 454 int git_configset_get_value(struct config_set *cs, const char *key, const char **dest);
 455
 456 int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest);
 457 int git_configset_get_string(struct config_set *cs, const char *key, char **dest);
 458 int git_configset_get_int(struct config_set *cs, const char *key, int *dest);
 459 int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest);
 460 int git_configset_get_bool(struct config_set *cs, const char *key, int *dest);
 461 int git_configset_get_bool_or_int(struct config_set *cs, const char *key, int *is_bool, int *dest);
 462 int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest);
 463 int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest);
 464
 465 /* Functions for reading a repository's config */
 466 struct repository;
 467 void repo_config(struct repository *repo, config_fn_t fn, void *data);
 468 int repo_config_get_value(struct repository *repo,
 469                           const char *key, const char **value);
 470 const struct string_list *repo_config_get_value_multi(struct repository *repo,
 471                                                       const char *key);
 472 int repo_config_get_string_const(struct repository *repo,
 473                                  const char *key, const char **dest);
 474 int repo_config_get_string(struct repository *repo,
 475                            const char *key, char **dest);
 476 int repo_config_get_int(struct repository *repo,
 477                         const char *key, int *dest);
 478 int repo_config_get_ulong(struct repository *repo,
 479                           const char *key, unsigned long *dest);
 480 int repo_config_get_bool(struct repository *repo,
 481                          const char *key, int *dest);
 482 int repo_config_get_bool_or_int(struct repository *repo,
 483                                 const char *key, int *is_bool, int *dest);
 484 int repo_config_get_maybe_bool(struct repository *repo,
 485                                const char *key, int *dest);
 486 int repo_config_get_pathname(struct repository *repo,
 487                              const char *key, const char **dest);
 488
 489 /**
 490  * Querying For Specific Variables
 491  * -------------------------------
 492  *
 493  * For programs wanting to query for specific variables in a non-callback
 494  * manner, the config API provides two functions `git_config_get_value`
 495  * and `git_config_get_value_multi`. They both read values from an internal
 496  * cache generated previously from reading the config files.
 497  */
 498
 499 /**
 500  * Finds the highest-priority value for the configuration variable `key`,
 501  * stores the pointer to it in `value` and returns 0. When the
 502  * configuration variable `key` is not found, returns 1 without touching
 503  * `value`. The caller should not free or modify `value`, as it is owned
 504  * by the cache.
 505  */
 506 int git_config_get_value(const char *key, const char **value);
 507
 508 /**
 509  * Finds and returns the value list, sorted in order of increasing priority
 510  * for the configuration variable `key`. When the configuration variable
 511  * `key` is not found, returns NULL. The caller should not free or modify
 512  * the returned pointer, as it is owned by the cache.
 513  */
 514 const struct string_list *git_config_get_value_multi(const char *key);
 515
 516 /**
 517  * Resets and invalidates the config cache.
 518  */
 519 void git_config_clear(void);
 520
 521 /**
 522  * Allocates and copies the retrieved string into the `dest` parameter for
 523  * the configuration variable `key`; if NULL string is given, prints an
 524  * error message and returns -1. When the configuration variable `key` is
 525  * not found, returns 1 without touching `dest`.
 526  */
 527 int git_config_get_string_const(const char *key, const char **dest);
 528
 529 /**
 530  * Similar to `git_config_get_string_const`, except that retrieved value
 531  * copied into the `dest` parameter is a mutable string.
 532  */
 533 int git_config_get_string(const char *key, char **dest);
 534
 535 /**
 536  * Finds and parses the value to an integer for the configuration variable
 537  * `key`. Dies on error; otherwise, stores the value of the parsed integer in
 538  * `dest` and returns 0. When the configuration variable `key` is not found,
 539  * returns 1 without touching `dest`.
 540  */
 541 int git_config_get_int(const char *key, int *dest);
 542
 543 /**
 544  * Similar to `git_config_get_int` but for unsigned longs.
 545  */
 546 int git_config_get_ulong(const char *key, unsigned long *dest);
 547
 548 /**
 549  * Finds and parses the value into a boolean value, for the configuration
 550  * variable `key` respecting keywords like "true" and "false". Integer
 551  * values are converted into true/false values (when they are non-zero or
 552  * zero, respectively). Other values cause a die(). If parsing is successful,
 553  * stores the value of the parsed result in `dest` and returns 0. When the
 554  * configuration variable `key` is not found, returns 1 without touching
 555  * `dest`.
 556  */
 557 int git_config_get_bool(const char *key, int *dest);
 558
 559 /**
 560  * Similar to `git_config_get_bool`, except that integers are copied as-is,
 561  * and `is_bool` flag is unset.
 562  */
 563 int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest);
 564
 565 /**
 566  * Similar to `git_config_get_bool`, except that it returns -1 on error
 567  * rather than dying.
 568  */
 569 int git_config_get_maybe_bool(const char *key, int *dest);
 570
 571 /**
 572  * Similar to `git_config_get_string`, but expands `~` or `~user` into
 573  * the user's home directory when found at the beginning of the path.
 574  */
 575 int git_config_get_pathname(const char *key, const char **dest);
 576
 577 int git_config_get_index_threads(int *dest);
 578 int git_config_get_untracked_cache(void);
 579 int git_config_get_split_index(void);
 580 int git_config_get_max_percent_split_change(void);
 581 int git_config_get_fsmonitor(void);
 582
 583 /* This dies if the configured or default date is in the future */
 584 int git_config_get_expiry(const char *key, const char **output);
 585
 586 /* parse either "this many days" integer, or "5.days.ago" approxidate */
 587 int git_config_get_expiry_in_days(const char *key, timestamp_t *, timestamp_t now);
 588
 589 struct key_value_info {
 590         const char *filename;
 591         int linenr;
 592         enum config_origin_type origin_type;
 593         enum config_scope scope;
 594 };
 595
 596 /**
 597  * First prints the error message specified by the caller in `err` and then
 598  * dies printing the line number and the file name of the highest priority
 599  * value for the configuration variable `key`.
 600  */
 601 NORETURN void git_die_config(const char *key, const char *err, ...) __attribute__((format(printf, 2, 3)));
 602
 603 /**
 604  * Helper function which formats the die error message according to the
 605  * parameters entered. Used by `git_die_config()`. It can be used by callers
 606  * handling `git_config_get_value_multi()` to print the correct error message
 607  * for the desired value.
 608  */
 609 NORETURN void git_die_config_linenr(const char *key, const char *filename, int linenr);
 610
 611 #define LOOKUP_CONFIG(mapping, var) \
 612         lookup_config(mapping, ARRAY_SIZE(mapping), var)
 613 int lookup_config(const char **mapping, int nr_mapping, const char *var);
 614
 615 #endif /* CONFIG_H */