Merge branch 'maint'
[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 }
242 die("bad config value for '%s' in %s", name, config_file_name);
243 }
244
245 int git_config_bool(const char *name, const char *value)
246 {
247 if (!value)
248 return 1;
249 if (!*value)
250 return 0;
251 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
252 return 1;
253 if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
254 return 0;
255 return git_config_int(name, value) != 0;
256 }
257
258 int git_default_config(const char *var, const char *value)
259 {
260 /* This needs a better name */
261 if (!strcmp(var, "core.filemode")) {
262 trust_executable_bit = git_config_bool(var, value);
263 return 0;
264 }
265
266 if (!strcmp(var, "core.ignorestat")) {
267 assume_unchanged = git_config_bool(var, value);
268 return 0;
269 }
270
271 if (!strcmp(var, "core.prefersymlinkrefs")) {
272 prefer_symlink_refs = git_config_bool(var, value);
273 return 0;
274 }
275
276 if (!strcmp(var, "core.logallrefupdates")) {
277 log_all_ref_updates = git_config_bool(var, value);
278 return 0;
279 }
280
281 if (!strcmp(var, "core.warnambiguousrefs")) {
282 warn_ambiguous_refs = git_config_bool(var, value);
283 return 0;
284 }
285
286 if (!strcmp(var, "core.legacyheaders")) {
287 use_legacy_headers = git_config_bool(var, value);
288 return 0;
289 }
290
291 if (!strcmp(var, "core.compression")) {
292 int level = git_config_int(var, value);
293 if (level == -1)
294 level = Z_DEFAULT_COMPRESSION;
295 else if (level < 0 || level > Z_BEST_COMPRESSION)
296 die("bad zlib compression level %d", level);
297 zlib_compression_level = level;
298 return 0;
299 }
300
301 if (!strcmp(var, "user.name")) {
302 strlcpy(git_default_name, value, sizeof(git_default_name));
303 return 0;
304 }
305
306 if (!strcmp(var, "user.email")) {
307 strlcpy(git_default_email, value, sizeof(git_default_email));
308 return 0;
309 }
310
311 if (!strcmp(var, "i18n.commitencoding")) {
312 strlcpy(git_commit_encoding, value, sizeof(git_commit_encoding));
313 return 0;
314 }
315
316 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
317 pager_use_color = git_config_bool(var,value);
318 return 0;
319 }
320
321 /* Add other config variables here and to Documentation/config.txt. */
322 return 0;
323 }
324
325 int git_config_from_file(config_fn_t fn, const char *filename)
326 {
327 int ret;
328 FILE *f = fopen(filename, "r");
329
330 ret = -1;
331 if (f) {
332 config_file = f;
333 config_file_name = filename;
334 config_linenr = 1;
335 ret = git_parse_file(fn);
336 fclose(f);
337 config_file_name = NULL;
338 }
339 return ret;
340 }
341
342 int git_config(config_fn_t fn)
343 {
344 int ret = 0;
345 char *repo_config = NULL;
346 const char *home = NULL, *filename;
347
348 /* $GIT_CONFIG makes git read _only_ the given config file,
349 * $GIT_CONFIG_LOCAL will make it process it in addition to the
350 * global config file, the same way it would the per-repository
351 * config file otherwise. */
352 filename = getenv("GIT_CONFIG");
353 if (!filename) {
354 home = getenv("HOME");
355 filename = getenv("GIT_CONFIG_LOCAL");
356 if (!filename)
357 filename = repo_config = xstrdup(git_path("config"));
358 }
359
360 if (home) {
361 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
362 if (!access(user_config, R_OK))
363 ret = git_config_from_file(fn, user_config);
364 free(user_config);
365 }
366
367 ret += git_config_from_file(fn, filename);
368 free(repo_config);
369 return ret;
370 }
371
372 /*
373 * Find all the stuff for git_config_set() below.
374 */
375
376 #define MAX_MATCHES 512
377
378 static struct {
379 int baselen;
380 char* key;
381 int do_not_match;
382 regex_t* value_regex;
383 int multi_replace;
384 off_t offset[MAX_MATCHES];
385 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
386 int seen;
387 } store;
388
389 static int matches(const char* key, const char* value)
390 {
391 return !strcmp(key, store.key) &&
392 (store.value_regex == NULL ||
393 (store.do_not_match ^
394 !regexec(store.value_regex, value, 0, NULL, 0)));
395 }
396
397 static int store_aux(const char* key, const char* value)
398 {
399 switch (store.state) {
400 case KEY_SEEN:
401 if (matches(key, value)) {
402 if (store.seen == 1 && store.multi_replace == 0) {
403 fprintf(stderr,
404 "Warning: %s has multiple values\n",
405 key);
406 } else if (store.seen >= MAX_MATCHES) {
407 fprintf(stderr, "Too many matches\n");
408 return 1;
409 }
410
411 store.offset[store.seen] = ftell(config_file);
412 store.seen++;
413 }
414 break;
415 case SECTION_SEEN:
416 if (strncmp(key, store.key, store.baselen+1)) {
417 store.state = SECTION_END_SEEN;
418 break;
419 } else
420 /* do not increment matches: this is no match */
421 store.offset[store.seen] = ftell(config_file);
422 /* fallthru */
423 case SECTION_END_SEEN:
424 case START:
425 if (matches(key, value)) {
426 store.offset[store.seen] = ftell(config_file);
427 store.state = KEY_SEEN;
428 store.seen++;
429 } else {
430 if (strrchr(key, '.') - key == store.baselen &&
431 !strncmp(key, store.key, store.baselen)) {
432 store.state = SECTION_SEEN;
433 store.offset[store.seen] = ftell(config_file);
434 }
435 }
436 }
437 return 0;
438 }
439
440 static void store_write_section(int fd, const char* key)
441 {
442 const char *dot = strchr(key, '.');
443 int len1 = store.baselen, len2 = -1;
444
445 dot = strchr(key, '.');
446 if (dot) {
447 int dotlen = dot - key;
448 if (dotlen < len1) {
449 len2 = len1 - dotlen - 1;
450 len1 = dotlen;
451 }
452 }
453
454 write(fd, "[", 1);
455 write(fd, key, len1);
456 if (len2 >= 0) {
457 write(fd, " \"", 2);
458 while (--len2 >= 0) {
459 unsigned char c = *++dot;
460 if (c == '"')
461 write(fd, "\\", 1);
462 write(fd, &c, 1);
463 }
464 write(fd, "\"", 1);
465 }
466 write(fd, "]\n", 2);
467 }
468
469 static void store_write_pair(int fd, const char* key, const char* value)
470 {
471 int i;
472
473 write(fd, "\t", 1);
474 write(fd, key+store.baselen+1,
475 strlen(key+store.baselen+1));
476 write(fd, " = ", 3);
477 for (i = 0; value[i]; i++)
478 switch (value[i]) {
479 case '\n': write(fd, "\\n", 2); break;
480 case '\t': write(fd, "\\t", 2); break;
481 case '"': case '\\': write(fd, "\\", 1);
482 default: write(fd, value+i, 1);
483 }
484 write(fd, "\n", 1);
485 }
486
487 static int find_beginning_of_line(const char* contents, int size,
488 int offset_, int* found_bracket)
489 {
490 int equal_offset = size, bracket_offset = size;
491 int offset;
492
493 for (offset = offset_-2; offset > 0
494 && contents[offset] != '\n'; offset--)
495 switch (contents[offset]) {
496 case '=': equal_offset = offset; break;
497 case ']': bracket_offset = offset; break;
498 }
499 if (bracket_offset < equal_offset) {
500 *found_bracket = 1;
501 offset = bracket_offset+1;
502 } else
503 offset++;
504
505 return offset;
506 }
507
508 int git_config_set(const char* key, const char* value)
509 {
510 return git_config_set_multivar(key, value, NULL, 0);
511 }
512
513 /*
514 * If value==NULL, unset in (remove from) config,
515 * if value_regex!=NULL, disregard key/value pairs where value does not match.
516 * if multi_replace==0, nothing, or only one matching key/value is replaced,
517 * else all matching key/values (regardless how many) are removed,
518 * before the new pair is written.
519 *
520 * Returns 0 on success.
521 *
522 * This function does this:
523 *
524 * - it locks the config file by creating ".git/config.lock"
525 *
526 * - it then parses the config using store_aux() as validator to find
527 * the position on the key/value pair to replace. If it is to be unset,
528 * it must be found exactly once.
529 *
530 * - the config file is mmap()ed and the part before the match (if any) is
531 * written to the lock file, then the changed part and the rest.
532 *
533 * - the config file is removed and the lock file rename()d to it.
534 *
535 */
536 int git_config_set_multivar(const char* key, const char* value,
537 const char* value_regex, int multi_replace)
538 {
539 int i, dot;
540 int fd = -1, in_fd;
541 int ret;
542 char* config_filename;
543 char* lock_file;
544 const char* last_dot = strrchr(key, '.');
545
546 config_filename = getenv("GIT_CONFIG");
547 if (!config_filename) {
548 config_filename = getenv("GIT_CONFIG_LOCAL");
549 if (!config_filename)
550 config_filename = git_path("config");
551 }
552 config_filename = xstrdup(config_filename);
553 lock_file = xstrdup(mkpath("%s.lock", config_filename));
554
555 /*
556 * Since "key" actually contains the section name and the real
557 * key name separated by a dot, we have to know where the dot is.
558 */
559
560 if (last_dot == NULL) {
561 fprintf(stderr, "key does not contain a section: %s\n", key);
562 ret = 2;
563 goto out_free;
564 }
565 store.baselen = last_dot - key;
566
567 store.multi_replace = multi_replace;
568
569 /*
570 * Validate the key and while at it, lower case it for matching.
571 */
572 store.key = xmalloc(strlen(key) + 1);
573 dot = 0;
574 for (i = 0; key[i]; i++) {
575 unsigned char c = key[i];
576 if (c == '.')
577 dot = 1;
578 /* Leave the extended basename untouched.. */
579 if (!dot || i > store.baselen) {
580 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
581 fprintf(stderr, "invalid key: %s\n", key);
582 free(store.key);
583 ret = 1;
584 goto out_free;
585 }
586 c = tolower(c);
587 }
588 store.key[i] = c;
589 }
590 store.key[i] = 0;
591
592 /*
593 * The lock_file serves a purpose in addition to locking: the new
594 * contents of .git/config will be written into it.
595 */
596 fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
597 if (fd < 0 || adjust_shared_perm(lock_file)) {
598 fprintf(stderr, "could not lock config file\n");
599 free(store.key);
600 ret = -1;
601 goto out_free;
602 }
603
604 /*
605 * If .git/config does not exist yet, write a minimal version.
606 */
607 in_fd = open(config_filename, O_RDONLY);
608 if ( in_fd < 0 ) {
609 free(store.key);
610
611 if ( ENOENT != errno ) {
612 error("opening %s: %s", config_filename,
613 strerror(errno));
614 ret = 3; /* same as "invalid config file" */
615 goto out_free;
616 }
617 /* if nothing to unset, error out */
618 if (value == NULL) {
619 ret = 5;
620 goto out_free;
621 }
622
623 store.key = (char*)key;
624 store_write_section(fd, key);
625 store_write_pair(fd, key, value);
626 } else{
627 struct stat st;
628 char* contents;
629 int i, copy_begin, copy_end, new_line = 0;
630
631 if (value_regex == NULL)
632 store.value_regex = NULL;
633 else {
634 if (value_regex[0] == '!') {
635 store.do_not_match = 1;
636 value_regex++;
637 } else
638 store.do_not_match = 0;
639
640 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
641 if (regcomp(store.value_regex, value_regex,
642 REG_EXTENDED)) {
643 fprintf(stderr, "Invalid pattern: %s\n",
644 value_regex);
645 free(store.value_regex);
646 ret = 6;
647 goto out_free;
648 }
649 }
650
651 store.offset[0] = 0;
652 store.state = START;
653 store.seen = 0;
654
655 /*
656 * After this, store.offset will contain the *end* offset
657 * of the last match, or remain at 0 if no match was found.
658 * As a side effect, we make sure to transform only a valid
659 * existing config file.
660 */
661 if (git_config_from_file(store_aux, config_filename)) {
662 fprintf(stderr, "invalid config file\n");
663 free(store.key);
664 if (store.value_regex != NULL) {
665 regfree(store.value_regex);
666 free(store.value_regex);
667 }
668 ret = 3;
669 goto out_free;
670 }
671
672 free(store.key);
673 if (store.value_regex != NULL) {
674 regfree(store.value_regex);
675 free(store.value_regex);
676 }
677
678 /* if nothing to unset, or too many matches, error out */
679 if ((store.seen == 0 && value == NULL) ||
680 (store.seen > 1 && multi_replace == 0)) {
681 ret = 5;
682 goto out_free;
683 }
684
685 fstat(in_fd, &st);
686 contents = mmap(NULL, st.st_size, PROT_READ,
687 MAP_PRIVATE, in_fd, 0);
688 close(in_fd);
689
690 if (store.seen == 0)
691 store.seen = 1;
692
693 for (i = 0, copy_begin = 0; i < store.seen; i++) {
694 if (store.offset[i] == 0) {
695 store.offset[i] = copy_end = st.st_size;
696 } else if (store.state != KEY_SEEN) {
697 copy_end = store.offset[i];
698 } else
699 copy_end = find_beginning_of_line(
700 contents, st.st_size,
701 store.offset[i]-2, &new_line);
702
703 /* write the first part of the config */
704 if (copy_end > copy_begin) {
705 write(fd, contents + copy_begin,
706 copy_end - copy_begin);
707 if (new_line)
708 write(fd, "\n", 1);
709 }
710 copy_begin = store.offset[i];
711 }
712
713 /* write the pair (value == NULL means unset) */
714 if (value != NULL) {
715 if (store.state == START)
716 store_write_section(fd, key);
717 store_write_pair(fd, key, value);
718 }
719
720 /* write the rest of the config */
721 if (copy_begin < st.st_size)
722 write(fd, contents + copy_begin,
723 st.st_size - copy_begin);
724
725 munmap(contents, st.st_size);
726 unlink(config_filename);
727 }
728
729 if (rename(lock_file, config_filename) < 0) {
730 fprintf(stderr, "Could not rename the lock file?\n");
731 ret = 4;
732 goto out_free;
733 }
734
735 ret = 0;
736
737 out_free:
738 if (0 <= fd)
739 close(fd);
740 free(config_filename);
741 if (lock_file) {
742 unlink(lock_file);
743 free(lock_file);
744 }
745 return ret;
746 }
747
748 int git_config_rename_section(const char *old_name, const char *new_name)
749 {
750 int ret = 0;
751 char *config_filename;
752 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
753 int out_fd;
754 char buf[1024];
755
756 config_filename = getenv("GIT_CONFIG");
757 if (!config_filename) {
758 config_filename = getenv("GIT_CONFIG_LOCAL");
759 if (!config_filename)
760 config_filename = git_path("config");
761 }
762 config_filename = xstrdup(config_filename);
763 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
764 if (out_fd < 0) {
765 ret = error("Could not lock config file!");
766 goto out;
767 }
768
769 if (!(config_file = fopen(config_filename, "rb"))) {
770 ret = error("Could not open config file!");
771 goto out;
772 }
773
774 while (fgets(buf, sizeof(buf), config_file)) {
775 int i;
776 for (i = 0; buf[i] && isspace(buf[i]); i++)
777 ; /* do nothing */
778 if (buf[i] == '[') {
779 /* it's a section */
780 int j = 0, dot = 0;
781 for (i++; buf[i] && buf[i] != ']'; i++) {
782 if (!dot && isspace(buf[i])) {
783 dot = 1;
784 if (old_name[j++] != '.')
785 break;
786 for (i++; isspace(buf[i]); i++)
787 ; /* do nothing */
788 if (buf[i] != '"')
789 break;
790 continue;
791 }
792 if (buf[i] == '\\' && dot)
793 i++;
794 else if (buf[i] == '"' && dot) {
795 for (i++; isspace(buf[i]); i++)
796 ; /* do_nothing */
797 break;
798 }
799 if (buf[i] != old_name[j++])
800 break;
801 }
802 if (buf[i] == ']') {
803 /* old_name matches */
804 ret++;
805 store.baselen = strlen(new_name);
806 store_write_section(out_fd, new_name);
807 continue;
808 }
809 }
810 write(out_fd, buf, strlen(buf));
811 }
812 fclose(config_file);
813 if (close(out_fd) || commit_lock_file(lock) < 0)
814 ret = error("Cannot commit config file!");
815 out:
816 free(config_filename);
817 return ret;
818 }
819