Make git-add behave more sensibly in a case-insensitive environment
[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 #include "exec_cmd.h"
10
11 #define MAXNAME (256)
12
13 static FILE *config_file;
14 static const char *config_file_name;
15 static int config_linenr;
16 static int config_file_eof;
17 static int zlib_compression_seen;
18
19 static int get_next_char(void)
20 {
21 int c;
22 FILE *f;
23
24 c = '\n';
25 if ((f = config_file) != NULL) {
26 c = fgetc(f);
27 if (c == '\r') {
28 /* DOS like systems */
29 c = fgetc(f);
30 if (c != '\n') {
31 ungetc(c, f);
32 c = '\r';
33 }
34 }
35 if (c == '\n')
36 config_linenr++;
37 if (c == EOF) {
38 config_file_eof = 1;
39 c = '\n';
40 }
41 }
42 return c;
43 }
44
45 static char *parse_value(void)
46 {
47 static char value[1024];
48 int quote = 0, comment = 0, len = 0, space = 0;
49
50 for (;;) {
51 int c = get_next_char();
52 if (len >= sizeof(value))
53 return NULL;
54 if (c == '\n') {
55 if (quote)
56 return NULL;
57 value[len] = 0;
58 return value;
59 }
60 if (comment)
61 continue;
62 if (isspace(c) && !quote) {
63 space = 1;
64 continue;
65 }
66 if (!quote) {
67 if (c == ';' || c == '#') {
68 comment = 1;
69 continue;
70 }
71 }
72 if (space) {
73 if (len)
74 value[len++] = ' ';
75 space = 0;
76 }
77 if (c == '\\') {
78 c = get_next_char();
79 switch (c) {
80 case '\n':
81 continue;
82 case 't':
83 c = '\t';
84 break;
85 case 'b':
86 c = '\b';
87 break;
88 case 'n':
89 c = '\n';
90 break;
91 /* Some characters escape as themselves */
92 case '\\': case '"':
93 break;
94 /* Reject unknown escape sequences */
95 default:
96 return NULL;
97 }
98 value[len++] = c;
99 continue;
100 }
101 if (c == '"') {
102 quote = 1-quote;
103 continue;
104 }
105 value[len++] = c;
106 }
107 }
108
109 static inline int iskeychar(int c)
110 {
111 return isalnum(c) || c == '-';
112 }
113
114 static int get_value(config_fn_t fn, char *name, unsigned int len)
115 {
116 int c;
117 char *value;
118
119 /* Get the full name */
120 for (;;) {
121 c = get_next_char();
122 if (config_file_eof)
123 break;
124 if (!iskeychar(c))
125 break;
126 name[len++] = tolower(c);
127 if (len >= MAXNAME)
128 return -1;
129 }
130 name[len] = 0;
131 while (c == ' ' || c == '\t')
132 c = get_next_char();
133
134 value = NULL;
135 if (c != '\n') {
136 if (c != '=')
137 return -1;
138 value = parse_value();
139 if (!value)
140 return -1;
141 }
142 return fn(name, value);
143 }
144
145 static int get_extended_base_var(char *name, int baselen, int c)
146 {
147 do {
148 if (c == '\n')
149 return -1;
150 c = get_next_char();
151 } while (isspace(c));
152
153 /* We require the format to be '[base "extension"]' */
154 if (c != '"')
155 return -1;
156 name[baselen++] = '.';
157
158 for (;;) {
159 int c = get_next_char();
160 if (c == '\n')
161 return -1;
162 if (c == '"')
163 break;
164 if (c == '\\') {
165 c = get_next_char();
166 if (c == '\n')
167 return -1;
168 }
169 name[baselen++] = c;
170 if (baselen > MAXNAME / 2)
171 return -1;
172 }
173
174 /* Final ']' */
175 if (get_next_char() != ']')
176 return -1;
177 return baselen;
178 }
179
180 static int get_base_var(char *name)
181 {
182 int baselen = 0;
183
184 for (;;) {
185 int c = get_next_char();
186 if (config_file_eof)
187 return -1;
188 if (c == ']')
189 return baselen;
190 if (isspace(c))
191 return get_extended_base_var(name, baselen, c);
192 if (!iskeychar(c) && c != '.')
193 return -1;
194 if (baselen > MAXNAME / 2)
195 return -1;
196 name[baselen++] = tolower(c);
197 }
198 }
199
200 static int git_parse_file(config_fn_t fn)
201 {
202 int comment = 0;
203 int baselen = 0;
204 static char var[MAXNAME];
205
206 for (;;) {
207 int c = get_next_char();
208 if (c == '\n') {
209 if (config_file_eof)
210 return 0;
211 comment = 0;
212 continue;
213 }
214 if (comment || isspace(c))
215 continue;
216 if (c == '#' || c == ';') {
217 comment = 1;
218 continue;
219 }
220 if (c == '[') {
221 baselen = get_base_var(var);
222 if (baselen <= 0)
223 break;
224 var[baselen++] = '.';
225 var[baselen] = 0;
226 continue;
227 }
228 if (!isalpha(c))
229 break;
230 var[baselen] = tolower(c);
231 if (get_value(fn, var, baselen+1) < 0)
232 break;
233 }
234 die("bad config file line %d in %s", config_linenr, config_file_name);
235 }
236
237 static int parse_unit_factor(const char *end, unsigned long *val)
238 {
239 if (!*end)
240 return 1;
241 else if (!strcasecmp(end, "k")) {
242 *val *= 1024;
243 return 1;
244 }
245 else if (!strcasecmp(end, "m")) {
246 *val *= 1024 * 1024;
247 return 1;
248 }
249 else if (!strcasecmp(end, "g")) {
250 *val *= 1024 * 1024 * 1024;
251 return 1;
252 }
253 return 0;
254 }
255
256 int git_parse_long(const char *value, long *ret)
257 {
258 if (value && *value) {
259 char *end;
260 long val = strtol(value, &end, 0);
261 unsigned long factor = 1;
262 if (!parse_unit_factor(end, &factor))
263 return 0;
264 *ret = val * factor;
265 return 1;
266 }
267 return 0;
268 }
269
270 int git_parse_ulong(const char *value, unsigned long *ret)
271 {
272 if (value && *value) {
273 char *end;
274 unsigned long val = strtoul(value, &end, 0);
275 if (!parse_unit_factor(end, &val))
276 return 0;
277 *ret = val;
278 return 1;
279 }
280 return 0;
281 }
282
283 static void die_bad_config(const char *name)
284 {
285 if (config_file_name)
286 die("bad config value for '%s' in %s", name, config_file_name);
287 die("bad config value for '%s'", name);
288 }
289
290 int git_config_int(const char *name, const char *value)
291 {
292 long ret;
293 if (!git_parse_long(value, &ret))
294 die_bad_config(name);
295 return ret;
296 }
297
298 unsigned long git_config_ulong(const char *name, const char *value)
299 {
300 unsigned long ret;
301 if (!git_parse_ulong(value, &ret))
302 die_bad_config(name);
303 return ret;
304 }
305
306 int git_config_bool(const char *name, const char *value)
307 {
308 if (!value)
309 return 1;
310 if (!*value)
311 return 0;
312 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
313 return 1;
314 if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
315 return 0;
316 return git_config_int(name, value) != 0;
317 }
318
319 int git_config_string(const char **dest, const char *var, const char *value)
320 {
321 if (!value)
322 return config_error_nonbool(var);
323 *dest = xstrdup(value);
324 return 0;
325 }
326
327 int git_default_config(const char *var, const char *value)
328 {
329 /* This needs a better name */
330 if (!strcmp(var, "core.filemode")) {
331 trust_executable_bit = git_config_bool(var, value);
332 return 0;
333 }
334
335 if (!strcmp(var, "core.quotepath")) {
336 quote_path_fully = git_config_bool(var, value);
337 return 0;
338 }
339
340 if (!strcmp(var, "core.symlinks")) {
341 has_symlinks = git_config_bool(var, value);
342 return 0;
343 }
344
345 if (!strcmp(var, "core.ignorecase")) {
346 ignore_case = git_config_bool(var, value);
347 return 0;
348 }
349
350 if (!strcmp(var, "core.bare")) {
351 is_bare_repository_cfg = git_config_bool(var, value);
352 return 0;
353 }
354
355 if (!strcmp(var, "core.ignorestat")) {
356 assume_unchanged = git_config_bool(var, value);
357 return 0;
358 }
359
360 if (!strcmp(var, "core.prefersymlinkrefs")) {
361 prefer_symlink_refs = git_config_bool(var, value);
362 return 0;
363 }
364
365 if (!strcmp(var, "core.logallrefupdates")) {
366 log_all_ref_updates = git_config_bool(var, value);
367 return 0;
368 }
369
370 if (!strcmp(var, "core.warnambiguousrefs")) {
371 warn_ambiguous_refs = git_config_bool(var, value);
372 return 0;
373 }
374
375 if (!strcmp(var, "core.loosecompression")) {
376 int level = git_config_int(var, value);
377 if (level == -1)
378 level = Z_DEFAULT_COMPRESSION;
379 else if (level < 0 || level > Z_BEST_COMPRESSION)
380 die("bad zlib compression level %d", level);
381 zlib_compression_level = level;
382 zlib_compression_seen = 1;
383 return 0;
384 }
385
386 if (!strcmp(var, "core.compression")) {
387 int level = git_config_int(var, value);
388 if (level == -1)
389 level = Z_DEFAULT_COMPRESSION;
390 else if (level < 0 || level > Z_BEST_COMPRESSION)
391 die("bad zlib compression level %d", level);
392 core_compression_level = level;
393 core_compression_seen = 1;
394 if (!zlib_compression_seen)
395 zlib_compression_level = level;
396 return 0;
397 }
398
399 if (!strcmp(var, "core.packedgitwindowsize")) {
400 int pgsz_x2 = getpagesize() * 2;
401 packed_git_window_size = git_config_int(var, value);
402
403 /* This value must be multiple of (pagesize * 2) */
404 packed_git_window_size /= pgsz_x2;
405 if (packed_git_window_size < 1)
406 packed_git_window_size = 1;
407 packed_git_window_size *= pgsz_x2;
408 return 0;
409 }
410
411 if (!strcmp(var, "core.packedgitlimit")) {
412 packed_git_limit = git_config_int(var, value);
413 return 0;
414 }
415
416 if (!strcmp(var, "core.deltabasecachelimit")) {
417 delta_base_cache_limit = git_config_int(var, value);
418 return 0;
419 }
420
421 if (!strcmp(var, "core.autocrlf")) {
422 if (value && !strcasecmp(value, "input")) {
423 auto_crlf = -1;
424 return 0;
425 }
426 auto_crlf = git_config_bool(var, value);
427 return 0;
428 }
429
430 if (!strcmp(var, "core.safecrlf")) {
431 if (value && !strcasecmp(value, "warn")) {
432 safe_crlf = SAFE_CRLF_WARN;
433 return 0;
434 }
435 safe_crlf = git_config_bool(var, value);
436 return 0;
437 }
438
439 if (!strcmp(var, "user.name")) {
440 if (!value)
441 return config_error_nonbool(var);
442 strlcpy(git_default_name, value, sizeof(git_default_name));
443 return 0;
444 }
445
446 if (!strcmp(var, "user.email")) {
447 if (!value)
448 return config_error_nonbool(var);
449 strlcpy(git_default_email, value, sizeof(git_default_email));
450 return 0;
451 }
452
453 if (!strcmp(var, "i18n.commitencoding"))
454 return git_config_string(&git_commit_encoding, var, value);
455
456 if (!strcmp(var, "i18n.logoutputencoding"))
457 return git_config_string(&git_log_output_encoding, var, value);
458
459 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
460 pager_use_color = git_config_bool(var,value);
461 return 0;
462 }
463
464 if (!strcmp(var, "core.pager"))
465 return git_config_string(&pager_program, var, value);
466
467 if (!strcmp(var, "core.editor"))
468 return git_config_string(&editor_program, var, value);
469
470 if (!strcmp(var, "core.excludesfile"))
471 return git_config_string(&excludes_file, var, value);
472
473 if (!strcmp(var, "core.whitespace")) {
474 if (!value)
475 return config_error_nonbool(var);
476 whitespace_rule_cfg = parse_whitespace_rule(value);
477 return 0;
478 }
479 if (!strcmp(var, "branch.autosetupmerge")) {
480 if (value && !strcasecmp(value, "always")) {
481 git_branch_track = BRANCH_TRACK_ALWAYS;
482 return 0;
483 }
484 git_branch_track = git_config_bool(var, value);
485 return 0;
486 }
487
488 /* Add other config variables here and to Documentation/config.txt. */
489 return 0;
490 }
491
492 int git_config_from_file(config_fn_t fn, const char *filename)
493 {
494 int ret;
495 FILE *f = fopen(filename, "r");
496
497 ret = -1;
498 if (f) {
499 config_file = f;
500 config_file_name = filename;
501 config_linenr = 1;
502 config_file_eof = 0;
503 ret = git_parse_file(fn);
504 fclose(f);
505 config_file_name = NULL;
506 }
507 return ret;
508 }
509
510 const char *git_etc_gitconfig(void)
511 {
512 static const char *system_wide;
513 if (!system_wide) {
514 system_wide = ETC_GITCONFIG;
515 if (!is_absolute_path(system_wide)) {
516 /* interpret path relative to exec-dir */
517 struct strbuf d = STRBUF_INIT;
518 strbuf_addf(&d, "%s/%s", git_exec_path(), system_wide);
519 system_wide = strbuf_detach(&d, NULL);
520 }
521 }
522 return system_wide;
523 }
524
525 int git_env_bool(const char *k, int def)
526 {
527 const char *v = getenv(k);
528 return v ? git_config_bool(k, v) : def;
529 }
530
531 int git_config_system(void)
532 {
533 return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
534 }
535
536 int git_config_global(void)
537 {
538 return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
539 }
540
541 int git_config(config_fn_t fn)
542 {
543 int ret = 0;
544 char *repo_config = NULL;
545 const char *home = NULL, *filename;
546
547 /* $GIT_CONFIG makes git read _only_ the given config file,
548 * $GIT_CONFIG_LOCAL will make it process it in addition to the
549 * global config file, the same way it would the per-repository
550 * config file otherwise. */
551 filename = getenv(CONFIG_ENVIRONMENT);
552 if (!filename) {
553 if (git_config_system() && !access(git_etc_gitconfig(), R_OK))
554 ret += git_config_from_file(fn, git_etc_gitconfig());
555 home = getenv("HOME");
556 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
557 if (!filename)
558 filename = repo_config = xstrdup(git_path("config"));
559 }
560
561 if (git_config_global() && home) {
562 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
563 if (!access(user_config, R_OK))
564 ret = git_config_from_file(fn, user_config);
565 free(user_config);
566 }
567
568 ret += git_config_from_file(fn, filename);
569 free(repo_config);
570 return ret;
571 }
572
573 /*
574 * Find all the stuff for git_config_set() below.
575 */
576
577 #define MAX_MATCHES 512
578
579 static struct {
580 int baselen;
581 char* key;
582 int do_not_match;
583 regex_t* value_regex;
584 int multi_replace;
585 size_t offset[MAX_MATCHES];
586 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
587 int seen;
588 } store;
589
590 static int matches(const char* key, const char* value)
591 {
592 return !strcmp(key, store.key) &&
593 (store.value_regex == NULL ||
594 (store.do_not_match ^
595 !regexec(store.value_regex, value, 0, NULL, 0)));
596 }
597
598 static int store_aux(const char* key, const char* value)
599 {
600 const char *ep;
601 size_t section_len;
602
603 switch (store.state) {
604 case KEY_SEEN:
605 if (matches(key, value)) {
606 if (store.seen == 1 && store.multi_replace == 0) {
607 fprintf(stderr,
608 "Warning: %s has multiple values\n",
609 key);
610 } else if (store.seen >= MAX_MATCHES) {
611 fprintf(stderr, "Too many matches\n");
612 return 1;
613 }
614
615 store.offset[store.seen] = ftell(config_file);
616 store.seen++;
617 }
618 break;
619 case SECTION_SEEN:
620 /*
621 * What we are looking for is in store.key (both
622 * section and var), and its section part is baselen
623 * long. We found key (again, both section and var).
624 * We would want to know if this key is in the same
625 * section as what we are looking for. We already
626 * know we are in the same section as what should
627 * hold store.key.
628 */
629 ep = strrchr(key, '.');
630 section_len = ep - key;
631
632 if ((section_len != store.baselen) ||
633 memcmp(key, store.key, section_len+1)) {
634 store.state = SECTION_END_SEEN;
635 break;
636 }
637
638 /*
639 * Do not increment matches: this is no match, but we
640 * just made sure we are in the desired section.
641 */
642 store.offset[store.seen] = ftell(config_file);
643 /* fallthru */
644 case SECTION_END_SEEN:
645 case START:
646 if (matches(key, value)) {
647 store.offset[store.seen] = ftell(config_file);
648 store.state = KEY_SEEN;
649 store.seen++;
650 } else {
651 if (strrchr(key, '.') - key == store.baselen &&
652 !strncmp(key, store.key, store.baselen)) {
653 store.state = SECTION_SEEN;
654 store.offset[store.seen] = ftell(config_file);
655 }
656 }
657 }
658 return 0;
659 }
660
661 static int write_error(void)
662 {
663 fprintf(stderr, "Failed to write new configuration file\n");
664
665 /* Same error code as "failed to rename". */
666 return 4;
667 }
668
669 static int store_write_section(int fd, const char* key)
670 {
671 const char *dot;
672 int i, success;
673 struct strbuf sb;
674
675 strbuf_init(&sb, 0);
676 dot = memchr(key, '.', store.baselen);
677 if (dot) {
678 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
679 for (i = dot - key + 1; i < store.baselen; i++) {
680 if (key[i] == '"')
681 strbuf_addch(&sb, '\\');
682 strbuf_addch(&sb, key[i]);
683 }
684 strbuf_addstr(&sb, "\"]\n");
685 } else {
686 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
687 }
688
689 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
690 strbuf_release(&sb);
691
692 return success;
693 }
694
695 static int store_write_pair(int fd, const char* key, const char* value)
696 {
697 int i, success;
698 int length = strlen(key + store.baselen + 1);
699 const char *quote = "";
700 struct strbuf sb;
701
702 /*
703 * Check to see if the value needs to be surrounded with a dq pair.
704 * Note that problematic characters are always backslash-quoted; this
705 * check is about not losing leading or trailing SP and strings that
706 * follow beginning-of-comment characters (i.e. ';' and '#') by the
707 * configuration parser.
708 */
709 if (value[0] == ' ')
710 quote = "\"";
711 for (i = 0; value[i]; i++)
712 if (value[i] == ';' || value[i] == '#')
713 quote = "\"";
714 if (i && value[i - 1] == ' ')
715 quote = "\"";
716
717 strbuf_init(&sb, 0);
718 strbuf_addf(&sb, "\t%.*s = %s",
719 length, key + store.baselen + 1, quote);
720
721 for (i = 0; value[i]; i++)
722 switch (value[i]) {
723 case '\n':
724 strbuf_addstr(&sb, "\\n");
725 break;
726 case '\t':
727 strbuf_addstr(&sb, "\\t");
728 break;
729 case '"':
730 case '\\':
731 strbuf_addch(&sb, '\\');
732 default:
733 strbuf_addch(&sb, value[i]);
734 break;
735 }
736 strbuf_addf(&sb, "%s\n", quote);
737
738 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
739 strbuf_release(&sb);
740
741 return success;
742 }
743
744 static ssize_t find_beginning_of_line(const char* contents, size_t size,
745 size_t offset_, int* found_bracket)
746 {
747 size_t equal_offset = size, bracket_offset = size;
748 ssize_t offset;
749
750 contline:
751 for (offset = offset_-2; offset > 0
752 && contents[offset] != '\n'; offset--)
753 switch (contents[offset]) {
754 case '=': equal_offset = offset; break;
755 case ']': bracket_offset = offset; break;
756 }
757 if (offset > 0 && contents[offset-1] == '\\') {
758 offset_ = offset;
759 goto contline;
760 }
761 if (bracket_offset < equal_offset) {
762 *found_bracket = 1;
763 offset = bracket_offset+1;
764 } else
765 offset++;
766
767 return offset;
768 }
769
770 int git_config_set(const char* key, const char* value)
771 {
772 return git_config_set_multivar(key, value, NULL, 0);
773 }
774
775 /*
776 * If value==NULL, unset in (remove from) config,
777 * if value_regex!=NULL, disregard key/value pairs where value does not match.
778 * if multi_replace==0, nothing, or only one matching key/value is replaced,
779 * else all matching key/values (regardless how many) are removed,
780 * before the new pair is written.
781 *
782 * Returns 0 on success.
783 *
784 * This function does this:
785 *
786 * - it locks the config file by creating ".git/config.lock"
787 *
788 * - it then parses the config using store_aux() as validator to find
789 * the position on the key/value pair to replace. If it is to be unset,
790 * it must be found exactly once.
791 *
792 * - the config file is mmap()ed and the part before the match (if any) is
793 * written to the lock file, then the changed part and the rest.
794 *
795 * - the config file is removed and the lock file rename()d to it.
796 *
797 */
798 int git_config_set_multivar(const char* key, const char* value,
799 const char* value_regex, int multi_replace)
800 {
801 int i, dot;
802 int fd = -1, in_fd;
803 int ret;
804 char* config_filename;
805 struct lock_file *lock = NULL;
806 const char* last_dot = strrchr(key, '.');
807
808 config_filename = getenv(CONFIG_ENVIRONMENT);
809 if (!config_filename) {
810 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
811 if (!config_filename)
812 config_filename = git_path("config");
813 }
814 config_filename = xstrdup(config_filename);
815
816 /*
817 * Since "key" actually contains the section name and the real
818 * key name separated by a dot, we have to know where the dot is.
819 */
820
821 if (last_dot == NULL) {
822 fprintf(stderr, "key does not contain a section: %s\n", key);
823 ret = 2;
824 goto out_free;
825 }
826 store.baselen = last_dot - key;
827
828 store.multi_replace = multi_replace;
829
830 /*
831 * Validate the key and while at it, lower case it for matching.
832 */
833 store.key = xmalloc(strlen(key) + 1);
834 dot = 0;
835 for (i = 0; key[i]; i++) {
836 unsigned char c = key[i];
837 if (c == '.')
838 dot = 1;
839 /* Leave the extended basename untouched.. */
840 if (!dot || i > store.baselen) {
841 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
842 fprintf(stderr, "invalid key: %s\n", key);
843 free(store.key);
844 ret = 1;
845 goto out_free;
846 }
847 c = tolower(c);
848 } else if (c == '\n') {
849 fprintf(stderr, "invalid key (newline): %s\n", key);
850 free(store.key);
851 ret = 1;
852 goto out_free;
853 }
854 store.key[i] = c;
855 }
856 store.key[i] = 0;
857
858 /*
859 * The lock serves a purpose in addition to locking: the new
860 * contents of .git/config will be written into it.
861 */
862 lock = xcalloc(sizeof(struct lock_file), 1);
863 fd = hold_lock_file_for_update(lock, config_filename, 0);
864 if (fd < 0) {
865 fprintf(stderr, "could not lock config file\n");
866 free(store.key);
867 ret = -1;
868 goto out_free;
869 }
870
871 /*
872 * If .git/config does not exist yet, write a minimal version.
873 */
874 in_fd = open(config_filename, O_RDONLY);
875 if ( in_fd < 0 ) {
876 free(store.key);
877
878 if ( ENOENT != errno ) {
879 error("opening %s: %s", config_filename,
880 strerror(errno));
881 ret = 3; /* same as "invalid config file" */
882 goto out_free;
883 }
884 /* if nothing to unset, error out */
885 if (value == NULL) {
886 ret = 5;
887 goto out_free;
888 }
889
890 store.key = (char*)key;
891 if (!store_write_section(fd, key) ||
892 !store_write_pair(fd, key, value))
893 goto write_err_out;
894 } else {
895 struct stat st;
896 char* contents;
897 size_t contents_sz, copy_begin, copy_end;
898 int i, new_line = 0;
899
900 if (value_regex == NULL)
901 store.value_regex = NULL;
902 else {
903 if (value_regex[0] == '!') {
904 store.do_not_match = 1;
905 value_regex++;
906 } else
907 store.do_not_match = 0;
908
909 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
910 if (regcomp(store.value_regex, value_regex,
911 REG_EXTENDED)) {
912 fprintf(stderr, "Invalid pattern: %s\n",
913 value_regex);
914 free(store.value_regex);
915 ret = 6;
916 goto out_free;
917 }
918 }
919
920 store.offset[0] = 0;
921 store.state = START;
922 store.seen = 0;
923
924 /*
925 * After this, store.offset will contain the *end* offset
926 * of the last match, or remain at 0 if no match was found.
927 * As a side effect, we make sure to transform only a valid
928 * existing config file.
929 */
930 if (git_config_from_file(store_aux, config_filename)) {
931 fprintf(stderr, "invalid config file\n");
932 free(store.key);
933 if (store.value_regex != NULL) {
934 regfree(store.value_regex);
935 free(store.value_regex);
936 }
937 ret = 3;
938 goto out_free;
939 }
940
941 free(store.key);
942 if (store.value_regex != NULL) {
943 regfree(store.value_regex);
944 free(store.value_regex);
945 }
946
947 /* if nothing to unset, or too many matches, error out */
948 if ((store.seen == 0 && value == NULL) ||
949 (store.seen > 1 && multi_replace == 0)) {
950 ret = 5;
951 goto out_free;
952 }
953
954 fstat(in_fd, &st);
955 contents_sz = xsize_t(st.st_size);
956 contents = xmmap(NULL, contents_sz, PROT_READ,
957 MAP_PRIVATE, in_fd, 0);
958 close(in_fd);
959
960 if (store.seen == 0)
961 store.seen = 1;
962
963 for (i = 0, copy_begin = 0; i < store.seen; i++) {
964 if (store.offset[i] == 0) {
965 store.offset[i] = copy_end = contents_sz;
966 } else if (store.state != KEY_SEEN) {
967 copy_end = store.offset[i];
968 } else
969 copy_end = find_beginning_of_line(
970 contents, contents_sz,
971 store.offset[i]-2, &new_line);
972
973 if (copy_end > 0 && contents[copy_end-1] != '\n')
974 new_line = 1;
975
976 /* write the first part of the config */
977 if (copy_end > copy_begin) {
978 if (write_in_full(fd, contents + copy_begin,
979 copy_end - copy_begin) <
980 copy_end - copy_begin)
981 goto write_err_out;
982 if (new_line &&
983 write_in_full(fd, "\n", 1) != 1)
984 goto write_err_out;
985 }
986 copy_begin = store.offset[i];
987 }
988
989 /* write the pair (value == NULL means unset) */
990 if (value != NULL) {
991 if (store.state == START) {
992 if (!store_write_section(fd, key))
993 goto write_err_out;
994 }
995 if (!store_write_pair(fd, key, value))
996 goto write_err_out;
997 }
998
999 /* write the rest of the config */
1000 if (copy_begin < contents_sz)
1001 if (write_in_full(fd, contents + copy_begin,
1002 contents_sz - copy_begin) <
1003 contents_sz - copy_begin)
1004 goto write_err_out;
1005
1006 munmap(contents, contents_sz);
1007 }
1008
1009 if (commit_lock_file(lock) < 0) {
1010 fprintf(stderr, "Cannot commit config file!\n");
1011 ret = 4;
1012 goto out_free;
1013 }
1014
1015 /*
1016 * lock is committed, so don't try to roll it back below.
1017 * NOTE: Since lockfile.c keeps a linked list of all created
1018 * lock_file structures, it isn't safe to free(lock). It's
1019 * better to just leave it hanging around.
1020 */
1021 lock = NULL;
1022 ret = 0;
1023
1024 out_free:
1025 if (lock)
1026 rollback_lock_file(lock);
1027 free(config_filename);
1028 return ret;
1029
1030 write_err_out:
1031 ret = write_error();
1032 goto out_free;
1033
1034 }
1035
1036 static int section_name_match (const char *buf, const char *name)
1037 {
1038 int i = 0, j = 0, dot = 0;
1039 for (; buf[i] && buf[i] != ']'; i++) {
1040 if (!dot && isspace(buf[i])) {
1041 dot = 1;
1042 if (name[j++] != '.')
1043 break;
1044 for (i++; isspace(buf[i]); i++)
1045 ; /* do nothing */
1046 if (buf[i] != '"')
1047 break;
1048 continue;
1049 }
1050 if (buf[i] == '\\' && dot)
1051 i++;
1052 else if (buf[i] == '"' && dot) {
1053 for (i++; isspace(buf[i]); i++)
1054 ; /* do_nothing */
1055 break;
1056 }
1057 if (buf[i] != name[j++])
1058 break;
1059 }
1060 return (buf[i] == ']' && name[j] == 0);
1061 }
1062
1063 /* if new_name == NULL, the section is removed instead */
1064 int git_config_rename_section(const char *old_name, const char *new_name)
1065 {
1066 int ret = 0, remove = 0;
1067 char *config_filename;
1068 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1069 int out_fd;
1070 char buf[1024];
1071
1072 config_filename = getenv(CONFIG_ENVIRONMENT);
1073 if (!config_filename) {
1074 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
1075 if (!config_filename)
1076 config_filename = git_path("config");
1077 }
1078 config_filename = xstrdup(config_filename);
1079 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1080 if (out_fd < 0) {
1081 ret = error("Could not lock config file!");
1082 goto out;
1083 }
1084
1085 if (!(config_file = fopen(config_filename, "rb"))) {
1086 /* no config file means nothing to rename, no error */
1087 goto unlock_and_out;
1088 }
1089
1090 while (fgets(buf, sizeof(buf), config_file)) {
1091 int i;
1092 int length;
1093 for (i = 0; buf[i] && isspace(buf[i]); i++)
1094 ; /* do nothing */
1095 if (buf[i] == '[') {
1096 /* it's a section */
1097 if (section_name_match (&buf[i+1], old_name)) {
1098 ret++;
1099 if (new_name == NULL) {
1100 remove = 1;
1101 continue;
1102 }
1103 store.baselen = strlen(new_name);
1104 if (!store_write_section(out_fd, new_name)) {
1105 ret = write_error();
1106 goto out;
1107 }
1108 continue;
1109 }
1110 remove = 0;
1111 }
1112 if (remove)
1113 continue;
1114 length = strlen(buf);
1115 if (write_in_full(out_fd, buf, length) != length) {
1116 ret = write_error();
1117 goto out;
1118 }
1119 }
1120 fclose(config_file);
1121 unlock_and_out:
1122 if (commit_lock_file(lock) < 0)
1123 ret = error("Cannot commit config file!");
1124 out:
1125 free(config_filename);
1126 return ret;
1127 }
1128
1129 /*
1130 * Call this to report error for your variable that should not
1131 * get a boolean value (i.e. "[my] var" means "true").
1132 */
1133 int config_error_nonbool(const char *var)
1134 {
1135 return error("Missing value for '%s'", var);
1136 }