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 const char *config_file_name;
15 static int config_linenr;
16 static int get_next_char(void)
22 if ((f = config_file) != NULL) {
25 /* DOS like systems */
42 static char *parse_value(void)
44 static char value[1024];
45 int quote = 0, comment = 0, len = 0, space = 0;
48 int c = get_next_char();
49 if (len >= sizeof(value))
59 if (isspace(c) && !quote) {
82 /* Some characters escape as themselves */
85 /* Reject unknown escape sequences */
97 if (c == ';' || c == '#') {
106 static int get_value(config_fn_t fn, char *name, unsigned int len)
111 /* Get the full name */
118 name[len++] = tolower(c);
123 while (c == ' ' || c == '\t')
130 value = parse_value();
134 return fn(name, value);
137 static int get_base_var(char *name)
142 int c = get_next_char();
147 if (!isalnum(c) && c != '.')
149 if (baselen > MAXNAME / 2)
151 name[baselen++] = tolower(c);
155 static int git_parse_file(config_fn_t fn)
159 static char var[MAXNAME];
162 int c = get_next_char();
170 if (comment || isspace(c))
172 if (c == '#' || c == ';') {
177 baselen = get_base_var(var);
180 var[baselen++] = '.';
186 var[baselen] = tolower(c);
187 if (get_value(fn, var, baselen+1) < 0)
190 die("bad config file line %d in %s", config_linenr, config_file_name);
193 int git_config_int(const char *name, const char *value)
195 if (value && *value) {
197 int val = strtol(value, &end, 0);
201 die("bad config value for '%s' in %s", name, config_file_name);
204 int git_config_bool(const char *name, const char *value)
210 if (!strcasecmp(value, "true"))
212 if (!strcasecmp(value, "false"))
214 return git_config_int(name, value) != 0;
217 int git_default_config(const char *var, const char *value)
219 /* This needs a better name */
220 if (!strcmp(var, "core.filemode")) {
221 trust_executable_bit = git_config_bool(var, value);
225 if (!strcmp(var, "core.symrefsonly")) {
226 only_use_symrefs = git_config_bool(var, value);
230 if (!strcmp(var, "user.name")) {
231 strncpy(git_default_name, value, sizeof(git_default_name));
235 if (!strcmp(var, "user.email")) {
236 strncpy(git_default_email, value, sizeof(git_default_email));
240 if (!strcmp(var, "i18n.commitencoding")) {
241 strncpy(git_commit_encoding, value, sizeof(git_commit_encoding));
245 /* Add other config variables here.. */
249 int git_config_from_file(config_fn_t fn, const char *filename)
252 FILE *f = fopen(filename, "r");
257 config_file_name = filename;
259 ret = git_parse_file(fn);
261 config_file_name = NULL;
266 int git_config(config_fn_t fn)
268 return git_config_from_file(fn, git_path("config"));
272 * Find all the stuff for git_config_set() below.
275 #define MAX_MATCHES 512
281 regex_t* value_regex;
283 off_t offset[MAX_MATCHES];
284 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
288 static int matches(const char* key, const char* value)
290 return !strcmp(key, store.key) &&
291 (store.value_regex == NULL ||
292 (store.do_not_match ^
293 !regexec(store.value_regex, value, 0, NULL, 0)));
296 static int store_aux(const char* key, const char* value)
298 switch (store.state) {
300 if (matches(key, value)) {
301 if (store.seen == 1 && store.multi_replace == 0) {
303 "Warning: %s has multiple values\n",
305 } else if (store.seen >= MAX_MATCHES) {
306 fprintf(stderr, "Too many matches\n");
310 store.offset[store.seen] = ftell(config_file);
315 if (strncmp(key, store.key, store.baselen+1)) {
316 store.state = SECTION_END_SEEN;
319 /* do not increment matches: this is no match */
320 store.offset[store.seen] = ftell(config_file);
322 case SECTION_END_SEEN:
324 if (matches(key, value)) {
325 store.offset[store.seen] = ftell(config_file);
326 store.state = KEY_SEEN;
328 } else if(!strncmp(key, store.key, store.baselen))
329 store.state = SECTION_SEEN;
334 static void store_write_section(int fd, const char* key)
337 write(fd, key, store.baselen);
341 static void store_write_pair(int fd, const char* key, const char* value)
346 write(fd, key+store.baselen+1,
347 strlen(key+store.baselen+1));
349 for (i = 0; value[i]; i++)
351 case '\n': write(fd, "\\n", 2); break;
352 case '\t': write(fd, "\\t", 2); break;
353 case '"': case '\\': write(fd, "\\", 1);
354 default: write(fd, value+i, 1);
359 static int find_beginning_of_line(const char* contents, int size,
360 int offset_, int* found_bracket)
362 int equal_offset = size, bracket_offset = size;
365 for (offset = offset_-2; offset > 0
366 && contents[offset] != '\n'; offset--)
367 switch (contents[offset]) {
368 case '=': equal_offset = offset; break;
369 case ']': bracket_offset = offset; break;
371 if (bracket_offset < equal_offset) {
373 offset = bracket_offset+1;
380 int git_config_set(const char* key, const char* value)
382 return git_config_set_multivar(key, value, NULL, 0);
386 * If value==NULL, unset in (remove from) config,
387 * if value_regex!=NULL, disregard key/value pairs where value does not match.
388 * if multi_replace==0, nothing, or only one matching key/value is replaced,
389 * else all matching key/values (regardless how many) are removed,
390 * before the new pair is written.
392 * Returns 0 on success.
394 * This function does this:
396 * - it locks the config file by creating ".git/config.lock"
398 * - it then parses the config using store_aux() as validator to find
399 * the position on the key/value pair to replace. If it is to be unset,
400 * it must be found exactly once.
402 * - the config file is mmap()ed and the part before the match (if any) is
403 * written to the lock file, then the changed part and the rest.
405 * - the config file is removed and the lock file rename()d to it.
408 int git_config_set_multivar(const char* key, const char* value,
409 const char* value_regex, int multi_replace)
414 char* config_filename = strdup(git_path("config"));
415 char* lock_file = strdup(git_path("config.lock"));
416 const char* last_dot = strrchr(key, '.');
419 * Since "key" actually contains the section name and the real
420 * key name separated by a dot, we have to know where the dot is.
423 if (last_dot == NULL) {
424 fprintf(stderr, "key does not contain a section: %s\n", key);
427 store.baselen = last_dot - key;
429 store.multi_replace = multi_replace;
432 * Validate the key and while at it, lower case it for matching.
434 store.key = (char*)malloc(strlen(key)+1);
435 for (i = 0; key[i]; i++)
436 if (i != store.baselen &&
437 ((!isalnum(key[i]) && key[i] != '.') ||
438 (i == store.baselen+1 && !isalpha(key[i])))) {
439 fprintf(stderr, "invalid key: %s\n", key);
443 store.key[i] = tolower(key[i]);
447 * The lock_file serves a purpose in addition to locking: the new
448 * contents of .git/config will be written into it.
450 fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
452 fprintf(stderr, "could not lock config file\n");
458 * If .git/config does not exist yet, write a minimal version.
460 if (stat(config_filename, &st)) {
463 /* if nothing to unset, error out */
470 store.key = (char*)key;
471 store_write_section(fd, key);
472 store_write_pair(fd, key, value);
476 int i, copy_begin, copy_end, new_line = 0;
478 if (value_regex == NULL)
479 store.value_regex = NULL;
481 if (value_regex[0] == '!') {
482 store.do_not_match = 1;
485 store.do_not_match = 0;
487 store.value_regex = (regex_t*)malloc(sizeof(regex_t));
488 if (regcomp(store.value_regex, value_regex,
490 fprintf(stderr, "Invalid pattern: %s\n",
492 free(store.value_regex);
502 * After this, store.offset will contain the *end* offset
503 * of the last match, or remain at 0 if no match was found.
504 * As a side effect, we make sure to transform only a valid
505 * existing config file.
507 if (git_config(store_aux)) {
508 fprintf(stderr, "invalid config file\n");
510 if (store.value_regex != NULL) {
511 regfree(store.value_regex);
512 free(store.value_regex);
518 if (store.value_regex != NULL) {
519 regfree(store.value_regex);
520 free(store.value_regex);
523 /* if nothing to unset, or too many matches, error out */
524 if ((store.seen == 0 && value == NULL) ||
525 (store.seen > 1 && multi_replace == 0)) {
531 in_fd = open(config_filename, O_RDONLY, 0666);
532 contents = mmap(NULL, st.st_size, PROT_READ,
533 MAP_PRIVATE, in_fd, 0);
539 for (i = 0, copy_begin = 0; i < store.seen; i++) {
540 if (store.offset[i] == 0) {
541 store.offset[i] = copy_end = st.st_size;
542 } else if (store.state != KEY_SEEN) {
543 copy_end = store.offset[i];
545 copy_end = find_beginning_of_line(
546 contents, st.st_size,
547 store.offset[i]-2, &new_line);
549 /* write the first part of the config */
550 if (copy_end > copy_begin) {
551 write(fd, contents + copy_begin,
552 copy_end - copy_begin);
556 copy_begin = store.offset[i];
559 /* write the pair (value == NULL means unset) */
561 if (store.state == START)
562 store_write_section(fd, key);
563 store_write_pair(fd, key, value);
566 /* write the rest of the config */
567 if (copy_begin < st.st_size)
568 write(fd, contents + copy_begin,
569 st.st_size - copy_begin);
571 munmap(contents, st.st_size);
572 unlink(config_filename);
577 if (rename(lock_file, config_filename) < 0) {
578 fprintf(stderr, "Could not rename the lock file?\n");