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) {
64 if (c == ';' || c == '#') {
88 /* Some characters escape as themselves */
91 /* Reject unknown escape sequences */
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_extended_base_var(char *name, int baselen, int c)
143 } while (isspace(c));
145 /* We require the format to be '[base "extension"]' */
148 name[baselen++] = '.';
151 int c = get_next_char();
162 if (baselen > MAXNAME / 2)
167 if (get_next_char() != ']')
172 static int get_base_var(char *name)
177 int c = get_next_char();
183 return get_extended_base_var(name, baselen, c);
184 if (!isalnum(c) && c != '.')
186 if (baselen > MAXNAME / 2)
188 name[baselen++] = tolower(c);
192 static int git_parse_file(config_fn_t fn)
196 static char var[MAXNAME];
199 int c = get_next_char();
207 if (comment || isspace(c))
209 if (c == '#' || c == ';') {
214 baselen = get_base_var(var);
217 var[baselen++] = '.';
223 var[baselen] = tolower(c);
224 if (get_value(fn, var, baselen+1) < 0)
227 die("bad config file line %d in %s", config_linenr, config_file_name);
230 int git_config_int(const char *name, const char *value)
232 if (value && *value) {
234 int val = strtol(value, &end, 0);
238 die("bad config value for '%s' in %s", name, config_file_name);
241 int git_config_bool(const char *name, const char *value)
247 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
249 if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
251 return git_config_int(name, value) != 0;
254 int git_default_config(const char *var, const char *value)
256 /* This needs a better name */
257 if (!strcmp(var, "core.filemode")) {
258 trust_executable_bit = git_config_bool(var, value);
262 if (!strcmp(var, "core.ignorestat")) {
263 assume_unchanged = git_config_bool(var, value);
267 if (!strcmp(var, "core.prefersymlinkrefs")) {
268 prefer_symlink_refs = git_config_bool(var, value);
272 if (!strcmp(var, "core.logallrefupdates")) {
273 log_all_ref_updates = git_config_bool(var, value);
277 if (!strcmp(var, "core.warnambiguousrefs")) {
278 warn_ambiguous_refs = git_config_bool(var, value);
282 if (!strcmp(var, "core.legacyheaders")) {
283 use_legacy_headers = git_config_bool(var, value);
287 if (!strcmp(var, "core.compression")) {
288 int level = git_config_int(var, value);
290 level = Z_DEFAULT_COMPRESSION;
291 else if (level < 0 || level > Z_BEST_COMPRESSION)
292 die("bad zlib compression level %d", level);
293 zlib_compression_level = level;
297 if (!strcmp(var, "user.name")) {
298 strlcpy(git_default_name, value, sizeof(git_default_name));
302 if (!strcmp(var, "user.email")) {
303 strlcpy(git_default_email, value, sizeof(git_default_email));
307 if (!strcmp(var, "i18n.commitencoding")) {
308 strlcpy(git_commit_encoding, value, sizeof(git_commit_encoding));
312 /* Add other config variables here and to Documentation/config.txt. */
316 int git_config_from_file(config_fn_t fn, const char *filename)
319 FILE *f = fopen(filename, "r");
324 config_file_name = filename;
326 ret = git_parse_file(fn);
328 config_file_name = NULL;
333 int git_config(config_fn_t fn)
336 char *repo_config = NULL;
337 const char *home = NULL, *filename;
339 /* $GIT_CONFIG makes git read _only_ the given config file,
340 * $GIT_CONFIG_LOCAL will make it process it in addition to the
341 * global config file, the same way it would the per-repository
342 * config file otherwise. */
343 filename = getenv("GIT_CONFIG");
345 home = getenv("HOME");
346 filename = getenv("GIT_CONFIG_LOCAL");
348 filename = repo_config = strdup(git_path("config"));
352 char *user_config = strdup(mkpath("%s/.gitconfig", home));
353 if (!access(user_config, R_OK))
354 ret = git_config_from_file(fn, user_config);
358 ret += git_config_from_file(fn, filename);
365 * Find all the stuff for git_config_set() below.
368 #define MAX_MATCHES 512
374 regex_t* value_regex;
376 off_t offset[MAX_MATCHES];
377 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
381 static int matches(const char* key, const char* value)
383 return !strcmp(key, store.key) &&
384 (store.value_regex == NULL ||
385 (store.do_not_match ^
386 !regexec(store.value_regex, value, 0, NULL, 0)));
389 static int store_aux(const char* key, const char* value)
391 switch (store.state) {
393 if (matches(key, value)) {
394 if (store.seen == 1 && store.multi_replace == 0) {
396 "Warning: %s has multiple values\n",
398 } else if (store.seen >= MAX_MATCHES) {
399 fprintf(stderr, "Too many matches\n");
403 store.offset[store.seen] = ftell(config_file);
408 if (strncmp(key, store.key, store.baselen+1)) {
409 store.state = SECTION_END_SEEN;
412 /* do not increment matches: this is no match */
413 store.offset[store.seen] = ftell(config_file);
415 case SECTION_END_SEEN:
417 if (matches(key, value)) {
418 store.offset[store.seen] = ftell(config_file);
419 store.state = KEY_SEEN;
422 if (strrchr(key, '.') - key == store.baselen &&
423 !strncmp(key, store.key, store.baselen)) {
424 store.state = SECTION_SEEN;
425 store.offset[store.seen] = ftell(config_file);
432 static void store_write_section(int fd, const char* key)
434 const char *dot = strchr(key, '.');
435 int len1 = store.baselen, len2 = -1;
437 dot = strchr(key, '.');
439 int dotlen = dot - key;
441 len2 = len1 - dotlen - 1;
447 write(fd, key, len1);
450 while (--len2 >= 0) {
451 unsigned char c = *++dot;
461 static void store_write_pair(int fd, const char* key, const char* value)
466 write(fd, key+store.baselen+1,
467 strlen(key+store.baselen+1));
469 for (i = 0; value[i]; i++)
471 case '\n': write(fd, "\\n", 2); break;
472 case '\t': write(fd, "\\t", 2); break;
473 case '"': case '\\': write(fd, "\\", 1);
474 default: write(fd, value+i, 1);
479 static int find_beginning_of_line(const char* contents, int size,
480 int offset_, int* found_bracket)
482 int equal_offset = size, bracket_offset = size;
485 for (offset = offset_-2; offset > 0
486 && contents[offset] != '\n'; offset--)
487 switch (contents[offset]) {
488 case '=': equal_offset = offset; break;
489 case ']': bracket_offset = offset; break;
491 if (bracket_offset < equal_offset) {
493 offset = bracket_offset+1;
500 int git_config_set(const char* key, const char* value)
502 return git_config_set_multivar(key, value, NULL, 0);
506 * If value==NULL, unset in (remove from) config,
507 * if value_regex!=NULL, disregard key/value pairs where value does not match.
508 * if multi_replace==0, nothing, or only one matching key/value is replaced,
509 * else all matching key/values (regardless how many) are removed,
510 * before the new pair is written.
512 * Returns 0 on success.
514 * This function does this:
516 * - it locks the config file by creating ".git/config.lock"
518 * - it then parses the config using store_aux() as validator to find
519 * the position on the key/value pair to replace. If it is to be unset,
520 * it must be found exactly once.
522 * - the config file is mmap()ed and the part before the match (if any) is
523 * written to the lock file, then the changed part and the rest.
525 * - the config file is removed and the lock file rename()d to it.
528 int git_config_set_multivar(const char* key, const char* value,
529 const char* value_regex, int multi_replace)
534 char* config_filename;
536 const char* last_dot = strrchr(key, '.');
538 config_filename = getenv("GIT_CONFIG");
539 if (!config_filename) {
540 config_filename = getenv("GIT_CONFIG_LOCAL");
541 if (!config_filename)
542 config_filename = git_path("config");
544 config_filename = strdup(config_filename);
545 lock_file = strdup(mkpath("%s.lock", config_filename));
548 * Since "key" actually contains the section name and the real
549 * key name separated by a dot, we have to know where the dot is.
552 if (last_dot == NULL) {
553 fprintf(stderr, "key does not contain a section: %s\n", key);
557 store.baselen = last_dot - key;
559 store.multi_replace = multi_replace;
562 * Validate the key and while at it, lower case it for matching.
564 store.key = (char*)malloc(strlen(key)+1);
566 for (i = 0; key[i]; i++) {
567 unsigned char c = key[i];
570 /* Leave the extended basename untouched.. */
571 if (!dot || i > store.baselen) {
572 if (!isalnum(c) || (i == store.baselen+1 && !isalpha(c))) {
573 fprintf(stderr, "invalid key: %s\n", key);
585 * The lock_file serves a purpose in addition to locking: the new
586 * contents of .git/config will be written into it.
588 fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
589 if (fd < 0 || adjust_shared_perm(lock_file)) {
590 fprintf(stderr, "could not lock config file\n");
597 * If .git/config does not exist yet, write a minimal version.
599 in_fd = open(config_filename, O_RDONLY);
603 if ( ENOENT != errno ) {
604 error("opening %s: %s", config_filename,
606 ret = 3; /* same as "invalid config file" */
609 /* if nothing to unset, error out */
615 store.key = (char*)key;
616 store_write_section(fd, key);
617 store_write_pair(fd, key, value);
621 int i, copy_begin, copy_end, new_line = 0;
623 if (value_regex == NULL)
624 store.value_regex = NULL;
626 if (value_regex[0] == '!') {
627 store.do_not_match = 1;
630 store.do_not_match = 0;
632 store.value_regex = (regex_t*)malloc(sizeof(regex_t));
633 if (regcomp(store.value_regex, value_regex,
635 fprintf(stderr, "Invalid pattern: %s\n",
637 free(store.value_regex);
648 * After this, store.offset will contain the *end* offset
649 * of the last match, or remain at 0 if no match was found.
650 * As a side effect, we make sure to transform only a valid
651 * existing config file.
653 if (git_config_from_file(store_aux, config_filename)) {
654 fprintf(stderr, "invalid config file\n");
656 if (store.value_regex != NULL) {
657 regfree(store.value_regex);
658 free(store.value_regex);
665 if (store.value_regex != NULL) {
666 regfree(store.value_regex);
667 free(store.value_regex);
670 /* if nothing to unset, or too many matches, error out */
671 if ((store.seen == 0 && value == NULL) ||
672 (store.seen > 1 && multi_replace == 0)) {
678 contents = mmap(NULL, st.st_size, PROT_READ,
679 MAP_PRIVATE, in_fd, 0);
685 for (i = 0, copy_begin = 0; i < store.seen; i++) {
686 if (store.offset[i] == 0) {
687 store.offset[i] = copy_end = st.st_size;
688 } else if (store.state != KEY_SEEN) {
689 copy_end = store.offset[i];
691 copy_end = find_beginning_of_line(
692 contents, st.st_size,
693 store.offset[i]-2, &new_line);
695 /* write the first part of the config */
696 if (copy_end > copy_begin) {
697 write(fd, contents + copy_begin,
698 copy_end - copy_begin);
702 copy_begin = store.offset[i];
705 /* write the pair (value == NULL means unset) */
707 if (store.state == START)
708 store_write_section(fd, key);
709 store_write_pair(fd, key, value);
712 /* write the rest of the config */
713 if (copy_begin < st.st_size)
714 write(fd, contents + copy_begin,
715 st.st_size - copy_begin);
717 munmap(contents, st.st_size);
718 unlink(config_filename);
721 if (rename(lock_file, config_filename) < 0) {
722 fprintf(stderr, "Could not rename the lock file?\n");
733 free(config_filename);