d537311ae1d4321c3f5f90930f7451262caf2ae5
[git/git.git] / config.c
1 /*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 * Copyright (C) Johannes Schindelin, 2005
6 *
7 */
8 #include "cache.h"
9
10 #define MAXNAME (256)
11
12 static FILE *config_file;
13 static const char *config_file_name;
14 static int config_linenr;
15 static int get_next_char(void)
16 {
17 int c;
18 FILE *f;
19
20 c = '\n';
21 if ((f = config_file) != NULL) {
22 c = fgetc(f);
23 if (c == '\r') {
24 /* DOS like systems */
25 c = fgetc(f);
26 if (c != '\n') {
27 ungetc(c, f);
28 c = '\r';
29 }
30 }
31 if (c == '\n')
32 config_linenr++;
33 if (c == EOF) {
34 config_file = NULL;
35 c = '\n';
36 }
37 }
38 return c;
39 }
40
41 static char *parse_value(void)
42 {
43 static char value[1024];
44 int quote = 0, comment = 0, len = 0, space = 0;
45
46 for (;;) {
47 int c = get_next_char();
48 if (len >= sizeof(value))
49 return NULL;
50 if (c == '\n') {
51 if (quote)
52 return NULL;
53 value[len] = 0;
54 return value;
55 }
56 if (comment)
57 continue;
58 if (isspace(c) && !quote) {
59 space = 1;
60 continue;
61 }
62 if (!quote) {
63 if (c == ';' || c == '#') {
64 comment = 1;
65 continue;
66 }
67 }
68 if (space) {
69 if (len)
70 value[len++] = ' ';
71 space = 0;
72 }
73 if (c == '\\') {
74 c = get_next_char();
75 switch (c) {
76 case '\n':
77 continue;
78 case 't':
79 c = '\t';
80 break;
81 case 'b':
82 c = '\b';
83 break;
84 case 'n':
85 c = '\n';
86 break;
87 /* Some characters escape as themselves */
88 case '\\': case '"':
89 break;
90 /* Reject unknown escape sequences */
91 default:
92 return NULL;
93 }
94 value[len++] = c;
95 continue;
96 }
97 if (c == '"') {
98 quote = 1-quote;
99 continue;
100 }
101 value[len++] = c;
102 }
103 }
104
105 static inline int iskeychar(int c)
106 {
107 return isalnum(c) || c == '-';
108 }
109
110 static int get_value(config_fn_t fn, char *name, unsigned int len)
111 {
112 int c;
113 char *value;
114
115 /* Get the full name */
116 for (;;) {
117 c = get_next_char();
118 if (c == EOF)
119 break;
120 if (!iskeychar(c))
121 break;
122 name[len++] = tolower(c);
123 if (len >= MAXNAME)
124 return -1;
125 }
126 name[len] = 0;
127 while (c == ' ' || c == '\t')
128 c = get_next_char();
129
130 value = NULL;
131 if (c != '\n') {
132 if (c != '=')
133 return -1;
134 value = parse_value();
135 if (!value)
136 return -1;
137 }
138 return fn(name, value);
139 }
140
141 static int get_extended_base_var(char *name, int baselen, int c)
142 {
143 do {
144 if (c == '\n')
145 return -1;
146 c = get_next_char();
147 } while (isspace(c));
148
149 /* We require the format to be '[base "extension"]' */
150 if (c != '"')
151 return -1;
152 name[baselen++] = '.';
153
154 for (;;) {
155 int c = get_next_char();
156 if (c == '\n')
157 return -1;
158 if (c == '"')
159 break;
160 if (c == '\\') {
161 c = get_next_char();
162 if (c == '\n')
163 return -1;
164 }
165 name[baselen++] = c;
166 if (baselen > MAXNAME / 2)
167 return -1;
168 }
169
170 /* Final ']' */
171 if (get_next_char() != ']')
172 return -1;
173 return baselen;
174 }
175
176 static int get_base_var(char *name)
177 {
178 int baselen = 0;
179
180 for (;;) {
181 int c = get_next_char();
182 if (c == EOF)
183 return -1;
184 if (c == ']')
185 return baselen;
186 if (isspace(c))
187 return get_extended_base_var(name, baselen, c);
188 if (!iskeychar(c) && c != '.')
189 return -1;
190 if (baselen > MAXNAME / 2)
191 return -1;
192 name[baselen++] = tolower(c);
193 }
194 }
195
196 static int git_parse_file(config_fn_t fn)
197 {
198 int comment = 0;
199 int baselen = 0;
200 static char var[MAXNAME];
201
202 for (;;) {
203 int c = get_next_char();
204 if (c == '\n') {
205 /* EOF? */
206 if (!config_file)
207 return 0;
208 comment = 0;
209 continue;
210 }
211 if (comment || isspace(c))
212 continue;
213 if (c == '#' || c == ';') {
214 comment = 1;
215 continue;
216 }
217 if (c == '[') {
218 baselen = get_base_var(var);
219 if (baselen <= 0)
220 break;
221 var[baselen++] = '.';
222 var[baselen] = 0;
223 continue;
224 }
225 if (!isalpha(c))
226 break;
227 var[baselen] = tolower(c);
228 if (get_value(fn, var, baselen+1) < 0)
229 break;
230 }
231 die("bad config file line %d in %s", config_linenr, config_file_name);
232 }
233
234 int git_config_int(const char *name, const char *value)
235 {
236 if (value && *value) {
237 char *end;
238 int val = strtol(value, &end, 0);
239 if (!*end)
240 return val;
241 if (!strcasecmp(end, "k"))
242 return val * 1024;
243 if (!strcasecmp(end, "m"))
244 return val * 1024 * 1024;
245 if (!strcasecmp(end, "g"))
246 return val * 1024 * 1024 * 1024;
247 }
248 die("bad config value for '%s' in %s", name, config_file_name);
249 }
250
251 int git_config_bool(const char *name, const char *value)
252 {
253 if (!value)
254 return 1;
255 if (!*value)
256 return 0;
257 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
258 return 1;
259 if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
260 return 0;
261 return git_config_int(name, value) != 0;
262 }
263
264 int git_default_config(const char *var, const char *value)
265 {
266 /* This needs a better name */
267 if (!strcmp(var, "core.filemode")) {
268 trust_executable_bit = git_config_bool(var, value);
269 return 0;
270 }
271
272 if (!strcmp(var, "core.symlinks")) {
273 has_symlinks = git_config_bool(var, value);
274 return 0;
275 }
276
277 if (!strcmp(var, "core.bare")) {
278 is_bare_repository_cfg = git_config_bool(var, value);
279 return 0;
280 }
281
282 if (!strcmp(var, "core.ignorestat")) {
283 assume_unchanged = git_config_bool(var, value);
284 return 0;
285 }
286
287 if (!strcmp(var, "core.prefersymlinkrefs")) {
288 prefer_symlink_refs = git_config_bool(var, value);
289 return 0;
290 }
291
292 if (!strcmp(var, "core.logallrefupdates")) {
293 log_all_ref_updates = git_config_bool(var, value);
294 return 0;
295 }
296
297 if (!strcmp(var, "core.warnambiguousrefs")) {
298 warn_ambiguous_refs = git_config_bool(var, value);
299 return 0;
300 }
301
302 if (!strcmp(var, "core.legacyheaders")) {
303 use_legacy_headers = git_config_bool(var, value);
304 return 0;
305 }
306
307 if (!strcmp(var, "core.compression")) {
308 int level = git_config_int(var, value);
309 if (level == -1)
310 level = Z_DEFAULT_COMPRESSION;
311 else if (level < 0 || level > Z_BEST_COMPRESSION)
312 die("bad zlib compression level %d", level);
313 zlib_compression_level = level;
314 return 0;
315 }
316
317 if (!strcmp(var, "core.packedgitwindowsize")) {
318 int pgsz_x2 = getpagesize() * 2;
319 packed_git_window_size = git_config_int(var, value);
320
321 /* This value must be multiple of (pagesize * 2) */
322 packed_git_window_size /= pgsz_x2;
323 if (packed_git_window_size < 1)
324 packed_git_window_size = 1;
325 packed_git_window_size *= pgsz_x2;
326 return 0;
327 }
328
329 if (!strcmp(var, "core.packedgitlimit")) {
330 packed_git_limit = git_config_int(var, value);
331 return 0;
332 }
333
334 if (!strcmp(var, "core.autocrlf")) {
335 if (value && !strcasecmp(value, "input")) {
336 auto_crlf = -1;
337 return 0;
338 }
339 auto_crlf = git_config_bool(var, value);
340 return 0;
341 }
342
343 if (!strcmp(var, "user.name")) {
344 strlcpy(git_default_name, value, sizeof(git_default_name));
345 return 0;
346 }
347
348 if (!strcmp(var, "user.email")) {
349 strlcpy(git_default_email, value, sizeof(git_default_email));
350 return 0;
351 }
352
353 if (!strcmp(var, "i18n.commitencoding")) {
354 git_commit_encoding = xstrdup(value);
355 return 0;
356 }
357
358 if (!strcmp(var, "i18n.logoutputencoding")) {
359 git_log_output_encoding = xstrdup(value);
360 return 0;
361 }
362
363
364 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
365 pager_use_color = git_config_bool(var,value);
366 return 0;
367 }
368
369 /* Add other config variables here and to Documentation/config.txt. */
370 return 0;
371 }
372
373 int git_config_from_file(config_fn_t fn, const char *filename)
374 {
375 int ret;
376 FILE *f = fopen(filename, "r");
377
378 ret = -1;
379 if (f) {
380 config_file = f;
381 config_file_name = filename;
382 config_linenr = 1;
383 ret = git_parse_file(fn);
384 fclose(f);
385 config_file_name = NULL;
386 }
387 return ret;
388 }
389
390 int git_config(config_fn_t fn)
391 {
392 int ret = 0;
393 char *repo_config = NULL;
394 const char *home = NULL, *filename;
395
396 /* $GIT_CONFIG makes git read _only_ the given config file,
397 * $GIT_CONFIG_LOCAL will make it process it in addition to the
398 * global config file, the same way it would the per-repository
399 * config file otherwise. */
400 filename = getenv(CONFIG_ENVIRONMENT);
401 if (!filename) {
402 if (!access(ETC_GITCONFIG, R_OK))
403 ret += git_config_from_file(fn, ETC_GITCONFIG);
404 home = getenv("HOME");
405 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
406 if (!filename)
407 filename = repo_config = xstrdup(git_path("config"));
408 }
409
410 if (home) {
411 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
412 if (!access(user_config, R_OK))
413 ret = git_config_from_file(fn, user_config);
414 free(user_config);
415 }
416
417 ret += git_config_from_file(fn, filename);
418 free(repo_config);
419 return ret;
420 }
421
422 /*
423 * Find all the stuff for git_config_set() below.
424 */
425
426 #define MAX_MATCHES 512
427
428 static struct {
429 int baselen;
430 char* key;
431 int do_not_match;
432 regex_t* value_regex;
433 int multi_replace;
434 size_t offset[MAX_MATCHES];
435 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
436 int seen;
437 } store;
438
439 static int matches(const char* key, const char* value)
440 {
441 return !strcmp(key, store.key) &&
442 (store.value_regex == NULL ||
443 (store.do_not_match ^
444 !regexec(store.value_regex, value, 0, NULL, 0)));
445 }
446
447 static int store_aux(const char* key, const char* value)
448 {
449 switch (store.state) {
450 case KEY_SEEN:
451 if (matches(key, value)) {
452 if (store.seen == 1 && store.multi_replace == 0) {
453 fprintf(stderr,
454 "Warning: %s has multiple values\n",
455 key);
456 } else if (store.seen >= MAX_MATCHES) {
457 fprintf(stderr, "Too many matches\n");
458 return 1;
459 }
460
461 store.offset[store.seen] = ftell(config_file);
462 store.seen++;
463 }
464 break;
465 case SECTION_SEEN:
466 if (strncmp(key, store.key, store.baselen+1)) {
467 store.state = SECTION_END_SEEN;
468 break;
469 } else
470 /* do not increment matches: this is no match */
471 store.offset[store.seen] = ftell(config_file);
472 /* fallthru */
473 case SECTION_END_SEEN:
474 case START:
475 if (matches(key, value)) {
476 store.offset[store.seen] = ftell(config_file);
477 store.state = KEY_SEEN;
478 store.seen++;
479 } else {
480 if (strrchr(key, '.') - key == store.baselen &&
481 !strncmp(key, store.key, store.baselen)) {
482 store.state = SECTION_SEEN;
483 store.offset[store.seen] = ftell(config_file);
484 }
485 }
486 }
487 return 0;
488 }
489
490 static int write_error()
491 {
492 fprintf(stderr, "Failed to write new configuration file\n");
493
494 /* Same error code as "failed to rename". */
495 return 4;
496 }
497
498 static int store_write_section(int fd, const char* key)
499 {
500 const char *dot = strchr(key, '.');
501 int len1 = store.baselen, len2 = -1;
502
503 dot = strchr(key, '.');
504 if (dot) {
505 int dotlen = dot - key;
506 if (dotlen < len1) {
507 len2 = len1 - dotlen - 1;
508 len1 = dotlen;
509 }
510 }
511
512 if (write_in_full(fd, "[", 1) != 1 ||
513 write_in_full(fd, key, len1) != len1)
514 return 0;
515 if (len2 >= 0) {
516 if (write_in_full(fd, " \"", 2) != 2)
517 return 0;
518 while (--len2 >= 0) {
519 unsigned char c = *++dot;
520 if (c == '"')
521 if (write_in_full(fd, "\\", 1) != 1)
522 return 0;
523 if (write_in_full(fd, &c, 1) != 1)
524 return 0;
525 }
526 if (write_in_full(fd, "\"", 1) != 1)
527 return 0;
528 }
529 if (write_in_full(fd, "]\n", 2) != 2)
530 return 0;
531
532 return 1;
533 }
534
535 static int store_write_pair(int fd, const char* key, const char* value)
536 {
537 int i;
538 int length = strlen(key+store.baselen+1);
539 int quote = 0;
540
541 /* Check to see if the value needs to be quoted. */
542 if (value[0] == ' ')
543 quote = 1;
544 for (i = 0; value[i]; i++)
545 if (value[i] == ';' || value[i] == '#')
546 quote = 1;
547 if (value[i-1] == ' ')
548 quote = 1;
549
550 if (write_in_full(fd, "\t", 1) != 1 ||
551 write_in_full(fd, key+store.baselen+1, length) != length ||
552 write_in_full(fd, " = ", 3) != 3)
553 return 0;
554 if (quote && write_in_full(fd, "\"", 1) != 1)
555 return 0;
556 for (i = 0; value[i]; i++)
557 switch (value[i]) {
558 case '\n':
559 if (write_in_full(fd, "\\n", 2) != 2)
560 return 0;
561 break;
562 case '\t':
563 if (write_in_full(fd, "\\t", 2) != 2)
564 return 0;
565 break;
566 case '"':
567 case '\\':
568 if (write_in_full(fd, "\\", 1) != 1)
569 return 0;
570 default:
571 if (write_in_full(fd, value+i, 1) != 1)
572 return 0;
573 break;
574 }
575 if (quote && write_in_full(fd, "\"", 1) != 1)
576 return 0;
577 if (write_in_full(fd, "\n", 1) != 1)
578 return 0;
579 return 1;
580 }
581
582 static ssize_t find_beginning_of_line(const char* contents, size_t size,
583 size_t offset_, int* found_bracket)
584 {
585 size_t equal_offset = size, bracket_offset = size;
586 ssize_t offset;
587
588 for (offset = offset_-2; offset > 0
589 && contents[offset] != '\n'; offset--)
590 switch (contents[offset]) {
591 case '=': equal_offset = offset; break;
592 case ']': bracket_offset = offset; break;
593 }
594 if (bracket_offset < equal_offset) {
595 *found_bracket = 1;
596 offset = bracket_offset+1;
597 } else
598 offset++;
599
600 return offset;
601 }
602
603 int git_config_set(const char* key, const char* value)
604 {
605 return git_config_set_multivar(key, value, NULL, 0);
606 }
607
608 /*
609 * If value==NULL, unset in (remove from) config,
610 * if value_regex!=NULL, disregard key/value pairs where value does not match.
611 * if multi_replace==0, nothing, or only one matching key/value is replaced,
612 * else all matching key/values (regardless how many) are removed,
613 * before the new pair is written.
614 *
615 * Returns 0 on success.
616 *
617 * This function does this:
618 *
619 * - it locks the config file by creating ".git/config.lock"
620 *
621 * - it then parses the config using store_aux() as validator to find
622 * the position on the key/value pair to replace. If it is to be unset,
623 * it must be found exactly once.
624 *
625 * - the config file is mmap()ed and the part before the match (if any) is
626 * written to the lock file, then the changed part and the rest.
627 *
628 * - the config file is removed and the lock file rename()d to it.
629 *
630 */
631 int git_config_set_multivar(const char* key, const char* value,
632 const char* value_regex, int multi_replace)
633 {
634 int i, dot;
635 int fd = -1, in_fd;
636 int ret;
637 char* config_filename;
638 char* lock_file;
639 const char* last_dot = strrchr(key, '.');
640
641 config_filename = getenv(CONFIG_ENVIRONMENT);
642 if (!config_filename) {
643 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
644 if (!config_filename)
645 config_filename = git_path("config");
646 }
647 config_filename = xstrdup(config_filename);
648 lock_file = xstrdup(mkpath("%s.lock", config_filename));
649
650 /*
651 * Since "key" actually contains the section name and the real
652 * key name separated by a dot, we have to know where the dot is.
653 */
654
655 if (last_dot == NULL) {
656 fprintf(stderr, "key does not contain a section: %s\n", key);
657 ret = 2;
658 goto out_free;
659 }
660 store.baselen = last_dot - key;
661
662 store.multi_replace = multi_replace;
663
664 /*
665 * Validate the key and while at it, lower case it for matching.
666 */
667 store.key = xmalloc(strlen(key) + 1);
668 dot = 0;
669 for (i = 0; key[i]; i++) {
670 unsigned char c = key[i];
671 if (c == '.')
672 dot = 1;
673 /* Leave the extended basename untouched.. */
674 if (!dot || i > store.baselen) {
675 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
676 fprintf(stderr, "invalid key: %s\n", key);
677 free(store.key);
678 ret = 1;
679 goto out_free;
680 }
681 c = tolower(c);
682 } else if (c == '\n') {
683 fprintf(stderr, "invalid key (newline): %s\n", key);
684 free(store.key);
685 ret = 1;
686 goto out_free;
687 }
688 store.key[i] = c;
689 }
690 store.key[i] = 0;
691
692 /*
693 * The lock_file serves a purpose in addition to locking: the new
694 * contents of .git/config will be written into it.
695 */
696 fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
697 if (fd < 0 || adjust_shared_perm(lock_file)) {
698 fprintf(stderr, "could not lock config file\n");
699 free(store.key);
700 ret = -1;
701 goto out_free;
702 }
703
704 /*
705 * If .git/config does not exist yet, write a minimal version.
706 */
707 in_fd = open(config_filename, O_RDONLY);
708 if ( in_fd < 0 ) {
709 free(store.key);
710
711 if ( ENOENT != errno ) {
712 error("opening %s: %s", config_filename,
713 strerror(errno));
714 ret = 3; /* same as "invalid config file" */
715 goto out_free;
716 }
717 /* if nothing to unset, error out */
718 if (value == NULL) {
719 ret = 5;
720 goto out_free;
721 }
722
723 store.key = (char*)key;
724 if (!store_write_section(fd, key) ||
725 !store_write_pair(fd, key, value))
726 goto write_err_out;
727 } else {
728 struct stat st;
729 char* contents;
730 size_t contents_sz, copy_begin, copy_end;
731 int i, new_line = 0;
732
733 if (value_regex == NULL)
734 store.value_regex = NULL;
735 else {
736 if (value_regex[0] == '!') {
737 store.do_not_match = 1;
738 value_regex++;
739 } else
740 store.do_not_match = 0;
741
742 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
743 if (regcomp(store.value_regex, value_regex,
744 REG_EXTENDED)) {
745 fprintf(stderr, "Invalid pattern: %s\n",
746 value_regex);
747 free(store.value_regex);
748 ret = 6;
749 goto out_free;
750 }
751 }
752
753 store.offset[0] = 0;
754 store.state = START;
755 store.seen = 0;
756
757 /*
758 * After this, store.offset will contain the *end* offset
759 * of the last match, or remain at 0 if no match was found.
760 * As a side effect, we make sure to transform only a valid
761 * existing config file.
762 */
763 if (git_config_from_file(store_aux, config_filename)) {
764 fprintf(stderr, "invalid config file\n");
765 free(store.key);
766 if (store.value_regex != NULL) {
767 regfree(store.value_regex);
768 free(store.value_regex);
769 }
770 ret = 3;
771 goto out_free;
772 }
773
774 free(store.key);
775 if (store.value_regex != NULL) {
776 regfree(store.value_regex);
777 free(store.value_regex);
778 }
779
780 /* if nothing to unset, or too many matches, error out */
781 if ((store.seen == 0 && value == NULL) ||
782 (store.seen > 1 && multi_replace == 0)) {
783 ret = 5;
784 goto out_free;
785 }
786
787 fstat(in_fd, &st);
788 contents_sz = xsize_t(st.st_size);
789 contents = xmmap(NULL, contents_sz, PROT_READ,
790 MAP_PRIVATE, in_fd, 0);
791 close(in_fd);
792
793 if (store.seen == 0)
794 store.seen = 1;
795
796 for (i = 0, copy_begin = 0; i < store.seen; i++) {
797 if (store.offset[i] == 0) {
798 store.offset[i] = copy_end = contents_sz;
799 } else if (store.state != KEY_SEEN) {
800 copy_end = store.offset[i];
801 } else
802 copy_end = find_beginning_of_line(
803 contents, contents_sz,
804 store.offset[i]-2, &new_line);
805
806 /* write the first part of the config */
807 if (copy_end > copy_begin) {
808 if (write_in_full(fd, contents + copy_begin,
809 copy_end - copy_begin) <
810 copy_end - copy_begin)
811 goto write_err_out;
812 if (new_line &&
813 write_in_full(fd, "\n", 1) != 1)
814 goto write_err_out;
815 }
816 copy_begin = store.offset[i];
817 }
818
819 /* write the pair (value == NULL means unset) */
820 if (value != NULL) {
821 if (store.state == START) {
822 if (!store_write_section(fd, key))
823 goto write_err_out;
824 }
825 if (!store_write_pair(fd, key, value))
826 goto write_err_out;
827 }
828
829 /* write the rest of the config */
830 if (copy_begin < contents_sz)
831 if (write_in_full(fd, contents + copy_begin,
832 contents_sz - copy_begin) <
833 contents_sz - copy_begin)
834 goto write_err_out;
835
836 munmap(contents, contents_sz);
837 unlink(config_filename);
838 }
839
840 if (rename(lock_file, config_filename) < 0) {
841 fprintf(stderr, "Could not rename the lock file?\n");
842 ret = 4;
843 goto out_free;
844 }
845
846 ret = 0;
847
848 out_free:
849 if (0 <= fd)
850 close(fd);
851 free(config_filename);
852 if (lock_file) {
853 unlink(lock_file);
854 free(lock_file);
855 }
856 return ret;
857
858 write_err_out:
859 ret = write_error();
860 goto out_free;
861
862 }
863
864 static int section_name_match (const char *buf, const char *name)
865 {
866 int i = 0, j = 0, dot = 0;
867 for (; buf[i] && buf[i] != ']'; i++) {
868 if (!dot && isspace(buf[i])) {
869 dot = 1;
870 if (name[j++] != '.')
871 break;
872 for (i++; isspace(buf[i]); i++)
873 ; /* do nothing */
874 if (buf[i] != '"')
875 break;
876 continue;
877 }
878 if (buf[i] == '\\' && dot)
879 i++;
880 else if (buf[i] == '"' && dot) {
881 for (i++; isspace(buf[i]); i++)
882 ; /* do_nothing */
883 break;
884 }
885 if (buf[i] != name[j++])
886 break;
887 }
888 return (buf[i] == ']' && name[j] == 0);
889 }
890
891 /* if new_name == NULL, the section is removed instead */
892 int git_config_rename_section(const char *old_name, const char *new_name)
893 {
894 int ret = 0, remove = 0;
895 char *config_filename;
896 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
897 int out_fd;
898 char buf[1024];
899
900 config_filename = getenv(CONFIG_ENVIRONMENT);
901 if (!config_filename) {
902 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
903 if (!config_filename)
904 config_filename = git_path("config");
905 }
906 config_filename = xstrdup(config_filename);
907 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
908 if (out_fd < 0) {
909 ret = error("Could not lock config file!");
910 goto out;
911 }
912
913 if (!(config_file = fopen(config_filename, "rb"))) {
914 ret = error("Could not open config file!");
915 goto out;
916 }
917
918 while (fgets(buf, sizeof(buf), config_file)) {
919 int i;
920 int length;
921 for (i = 0; buf[i] && isspace(buf[i]); i++)
922 ; /* do nothing */
923 if (buf[i] == '[') {
924 /* it's a section */
925 if (section_name_match (&buf[i+1], old_name)) {
926 ret++;
927 if (new_name == NULL) {
928 remove = 1;
929 continue;
930 }
931 store.baselen = strlen(new_name);
932 if (!store_write_section(out_fd, new_name)) {
933 ret = write_error();
934 goto out;
935 }
936 continue;
937 }
938 remove = 0;
939 }
940 if (remove)
941 continue;
942 length = strlen(buf);
943 if (write_in_full(out_fd, buf, length) != length) {
944 ret = write_error();
945 goto out;
946 }
947 }
948 fclose(config_file);
949 if (close(out_fd) || commit_lock_file(lock) < 0)
950 ret = error("Cannot commit config file!");
951 out:
952 free(config_filename);
953 return ret;
954 }
955