2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
5 * Copyright (C) Johannes Schindelin, 2005
13 static FILE *config_file;
14 static int config_linenr;
15 static int get_next_char(void)
21 if ((f = config_file) != NULL) {
24 /* DOS like systems */
41 static char *parse_value(void)
43 static char value[1024];
44 int quote = 0, comment = 0, len = 0, space = 0;
47 int c = get_next_char();
48 if (len >= sizeof(value))
58 if (isspace(c) && !quote) {
81 /* Some characters escape as themselves */
84 /* Reject unknown escape sequences */
96 if (c == ';' || c == '#') {
105 static int get_value(config_fn_t fn, char *name, unsigned int len)
110 /* Get the full name */
117 name[len++] = tolower(c);
122 while (c == ' ' || c == '\t')
129 value = parse_value();
133 return fn(name, value);
136 static int get_base_var(char *name)
141 int c = get_next_char();
146 if (!isalnum(c) && c != '.')
148 if (baselen > MAXNAME / 2)
150 name[baselen++] = tolower(c);
154 static int git_parse_file(config_fn_t fn)
158 static char var[MAXNAME];
161 int c = get_next_char();
169 if (comment || isspace(c))
171 if (c == '#' || c == ';') {
176 baselen = get_base_var(var);
179 var[baselen++] = '.';
185 var[baselen] = tolower(c);
186 if (get_value(fn, var, baselen+1) < 0)
189 die("bad config file line %d", config_linenr);
192 int git_config_int(const char *name, const char *value)
194 if (value && *value) {
196 int val = strtol(value, &end, 0);
200 die("bad config value for '%s'", name);
203 int git_config_bool(const char *name, const char *value)
209 if (!strcasecmp(value, "true"))
211 if (!strcasecmp(value, "false"))
213 return git_config_int(name, value) != 0;
216 int git_default_config(const char *var, const char *value)
218 /* This needs a better name */
219 if (!strcmp(var, "core.filemode")) {
220 trust_executable_bit = git_config_bool(var, value);
224 if (!strcmp(var, "core.symrefsonly")) {
225 only_use_symrefs = git_config_bool(var, value);
229 if (!strcmp(var, "user.name")) {
230 strncpy(git_default_name, value, sizeof(git_default_name));
234 if (!strcmp(var, "user.email")) {
235 strncpy(git_default_email, value, sizeof(git_default_email));
239 /* Add other config variables here.. */
243 int git_config(config_fn_t fn)
246 FILE *f = fopen(git_path("config"), "r");
252 ret = git_parse_file(fn);
259 * Find all the stuff for git_config_set() below.
262 #define MAX_MATCHES 512
268 regex_t* value_regex;
270 off_t offset[MAX_MATCHES];
271 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
275 static int matches(const char* key, const char* value)
277 return !strcmp(key, store.key) &&
278 (store.value_regex == NULL ||
279 (store.do_not_match ^
280 !regexec(store.value_regex, value, 0, NULL, 0)));
283 static int store_aux(const char* key, const char* value)
285 switch (store.state) {
287 if (matches(key, value)) {
288 if (store.seen == 1 && store.multi_replace == 0) {
290 "Warning: %s has multiple values\n",
292 } else if (store.seen >= MAX_MATCHES) {
293 fprintf(stderr, "Too many matches\n");
297 store.offset[store.seen] = ftell(config_file);
302 if (strncmp(key, store.key, store.baselen+1)) {
303 store.state = SECTION_END_SEEN;
306 /* do not increment matches: this is no match */
307 store.offset[store.seen] = ftell(config_file);
309 case SECTION_END_SEEN:
311 if (matches(key, value)) {
312 store.offset[store.seen] = ftell(config_file);
313 store.state = KEY_SEEN;
315 } else if(!strncmp(key, store.key, store.baselen))
316 store.state = SECTION_SEEN;
321 static void store_write_section(int fd, const char* key)
324 write(fd, key, store.baselen);
328 static void store_write_pair(int fd, const char* key, const char* value)
333 write(fd, key+store.baselen+1,
334 strlen(key+store.baselen+1));
336 for (i = 0; value[i]; i++)
338 case '\n': write(fd, "\\n", 2); break;
339 case '\t': write(fd, "\\t", 2); break;
340 case '"': case '\\': write(fd, "\\", 1);
341 default: write(fd, value+i, 1);
346 static int find_beginning_of_line(const char* contents, int size,
347 int offset_, int* found_bracket)
349 int equal_offset = size, bracket_offset = size;
352 for (offset = offset_-2; offset > 0
353 && contents[offset] != '\n'; offset--)
354 switch (contents[offset]) {
355 case '=': equal_offset = offset; break;
356 case ']': bracket_offset = offset; break;
358 if (bracket_offset < equal_offset) {
360 offset = bracket_offset+1;
367 int git_config_set(const char* key, const char* value)
369 return git_config_set_multivar(key, value, NULL, 0);
373 * If value==NULL, unset in (remove from) config,
374 * if value_regex!=NULL, disregard key/value pairs where value does not match.
375 * if multi_replace==0, nothing, or only one matching key/value is replaced,
376 * else all matching key/values (regardless how many) are removed,
377 * before the new pair is written.
379 * Returns 0 on success.
381 * This function does this:
383 * - it locks the config file by creating ".git/config.lock"
385 * - it then parses the config using store_aux() as validator to find
386 * the position on the key/value pair to replace. If it is to be unset,
387 * it must be found exactly once.
389 * - the config file is mmap()ed and the part before the match (if any) is
390 * written to the lock file, then the changed part and the rest.
392 * - the config file is removed and the lock file rename()d to it.
395 int git_config_set_multivar(const char* key, const char* value,
396 const char* value_regex, int multi_replace)
401 char* config_filename = strdup(git_path("config"));
402 char* lock_file = strdup(git_path("config.lock"));
403 const char* last_dot = strrchr(key, '.');
406 * Since "key" actually contains the section name and the real
407 * key name separated by a dot, we have to know where the dot is.
410 if (last_dot == NULL) {
411 fprintf(stderr, "key does not contain a section: %s\n", key);
414 store.baselen = last_dot - key;
416 store.multi_replace = multi_replace;
419 * Validate the key and while at it, lower case it for matching.
421 store.key = (char*)malloc(strlen(key)+1);
422 for (i = 0; key[i]; i++)
423 if (i != store.baselen &&
424 ((!isalnum(key[i]) && key[i] != '.') ||
425 (i == store.baselen+1 && !isalpha(key[i])))) {
426 fprintf(stderr, "invalid key: %s\n", key);
430 store.key[i] = tolower(key[i]);
434 * The lock_file serves a purpose in addition to locking: the new
435 * contents of .git/config will be written into it.
437 fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
439 fprintf(stderr, "could not lock config file\n");
445 * If .git/config does not exist yet, write a minimal version.
447 if (stat(config_filename, &st)) {
448 static const char contents[] =
450 "# This is the config file\n"
456 /* if nothing to unset, error out */
463 store.key = (char*)key;
465 write(fd, contents, sizeof(contents)-1);
466 store_write_section(fd, key);
467 store_write_pair(fd, key, value);
471 int i, copy_begin, copy_end, new_line = 0;
473 if (value_regex == NULL)
474 store.value_regex = NULL;
476 if (value_regex[0] == '!') {
477 store.do_not_match = 1;
480 store.do_not_match = 0;
482 store.value_regex = (regex_t*)malloc(sizeof(regex_t));
483 if (regcomp(store.value_regex, value_regex,
485 fprintf(stderr, "Invalid pattern: %s",
487 free(store.value_regex);
497 * After this, store.offset will contain the *end* offset
498 * of the last match, or remain at 0 if no match was found.
499 * As a side effect, we make sure to transform only a valid
500 * existing config file.
502 if (git_config(store_aux)) {
503 fprintf(stderr, "invalid config file\n");
505 if (store.value_regex != NULL) {
506 regfree(store.value_regex);
507 free(store.value_regex);
513 if (store.value_regex != NULL) {
514 regfree(store.value_regex);
515 free(store.value_regex);
518 /* if nothing to unset, or too many matches, error out */
519 if ((store.seen == 0 && value == NULL) ||
520 (store.seen > 1 && multi_replace == 0)) {
526 in_fd = open(config_filename, O_RDONLY, 0666);
527 contents = mmap(NULL, st.st_size, PROT_READ,
528 MAP_PRIVATE, in_fd, 0);
534 for (i = 0, copy_begin = 0; i < store.seen; i++) {
535 if (store.offset[i] == 0) {
536 store.offset[i] = copy_end = st.st_size;
537 } else if (store.state != KEY_SEEN) {
538 copy_end = store.offset[i];
540 copy_end = find_beginning_of_line(
541 contents, st.st_size,
542 store.offset[i]-2, &new_line);
544 /* write the first part of the config */
545 if (copy_end > copy_begin) {
546 write(fd, contents + copy_begin,
547 copy_end - copy_begin);
551 copy_begin = store.offset[i];
554 /* write the pair (value == NULL means unset) */
556 if (store.state == START)
557 store_write_section(fd, key);
558 store_write_pair(fd, key, value);
561 /* write the rest of the config */
562 if (copy_begin < st.st_size)
563 write(fd, contents + copy_begin,
564 st.st_size - copy_begin);
566 munmap(contents, st.st_size);
567 unlink(config_filename);
572 if (rename(lock_file, config_filename) < 0) {
573 fprintf(stderr, "Could not rename the lock file?\n");