Merge branch 'lt/case-insensitive'
[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_or_int(const char *name, const char *value, int *is_bool)
307 {
308 *is_bool = 1;
309 if (!value)
310 return 1;
311 if (!*value)
312 return 0;
313 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
314 return 1;
315 if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
316 return 0;
317 *is_bool = 0;
318 return git_config_int(name, value);
319 }
320
321 int git_config_bool(const char *name, const char *value)
322 {
323 int discard;
324 return !!git_config_bool_or_int(name, value, &discard);
325 }
326
327 int git_config_string(const char **dest, const char *var, const char *value)
328 {
329 if (!value)
330 return config_error_nonbool(var);
331 *dest = xstrdup(value);
332 return 0;
333 }
334
335 int git_default_config(const char *var, const char *value)
336 {
337 /* This needs a better name */
338 if (!strcmp(var, "core.filemode")) {
339 trust_executable_bit = git_config_bool(var, value);
340 return 0;
341 }
342
343 if (!strcmp(var, "core.quotepath")) {
344 quote_path_fully = git_config_bool(var, value);
345 return 0;
346 }
347
348 if (!strcmp(var, "core.symlinks")) {
349 has_symlinks = git_config_bool(var, value);
350 return 0;
351 }
352
353 if (!strcmp(var, "core.ignorecase")) {
354 ignore_case = git_config_bool(var, value);
355 return 0;
356 }
357
358 if (!strcmp(var, "core.bare")) {
359 is_bare_repository_cfg = git_config_bool(var, value);
360 return 0;
361 }
362
363 if (!strcmp(var, "core.ignorestat")) {
364 assume_unchanged = git_config_bool(var, value);
365 return 0;
366 }
367
368 if (!strcmp(var, "core.prefersymlinkrefs")) {
369 prefer_symlink_refs = git_config_bool(var, value);
370 return 0;
371 }
372
373 if (!strcmp(var, "core.logallrefupdates")) {
374 log_all_ref_updates = git_config_bool(var, value);
375 return 0;
376 }
377
378 if (!strcmp(var, "core.warnambiguousrefs")) {
379 warn_ambiguous_refs = git_config_bool(var, value);
380 return 0;
381 }
382
383 if (!strcmp(var, "core.loosecompression")) {
384 int level = git_config_int(var, value);
385 if (level == -1)
386 level = Z_DEFAULT_COMPRESSION;
387 else if (level < 0 || level > Z_BEST_COMPRESSION)
388 die("bad zlib compression level %d", level);
389 zlib_compression_level = level;
390 zlib_compression_seen = 1;
391 return 0;
392 }
393
394 if (!strcmp(var, "core.compression")) {
395 int level = git_config_int(var, value);
396 if (level == -1)
397 level = Z_DEFAULT_COMPRESSION;
398 else if (level < 0 || level > Z_BEST_COMPRESSION)
399 die("bad zlib compression level %d", level);
400 core_compression_level = level;
401 core_compression_seen = 1;
402 if (!zlib_compression_seen)
403 zlib_compression_level = level;
404 return 0;
405 }
406
407 if (!strcmp(var, "core.packedgitwindowsize")) {
408 int pgsz_x2 = getpagesize() * 2;
409 packed_git_window_size = git_config_int(var, value);
410
411 /* This value must be multiple of (pagesize * 2) */
412 packed_git_window_size /= pgsz_x2;
413 if (packed_git_window_size < 1)
414 packed_git_window_size = 1;
415 packed_git_window_size *= pgsz_x2;
416 return 0;
417 }
418
419 if (!strcmp(var, "core.packedgitlimit")) {
420 packed_git_limit = git_config_int(var, value);
421 return 0;
422 }
423
424 if (!strcmp(var, "core.deltabasecachelimit")) {
425 delta_base_cache_limit = git_config_int(var, value);
426 return 0;
427 }
428
429 if (!strcmp(var, "core.autocrlf")) {
430 if (value && !strcasecmp(value, "input")) {
431 auto_crlf = -1;
432 return 0;
433 }
434 auto_crlf = git_config_bool(var, value);
435 return 0;
436 }
437
438 if (!strcmp(var, "core.safecrlf")) {
439 if (value && !strcasecmp(value, "warn")) {
440 safe_crlf = SAFE_CRLF_WARN;
441 return 0;
442 }
443 safe_crlf = git_config_bool(var, value);
444 return 0;
445 }
446
447 if (!strcmp(var, "user.name")) {
448 if (!value)
449 return config_error_nonbool(var);
450 strlcpy(git_default_name, value, sizeof(git_default_name));
451 return 0;
452 }
453
454 if (!strcmp(var, "user.email")) {
455 if (!value)
456 return config_error_nonbool(var);
457 strlcpy(git_default_email, value, sizeof(git_default_email));
458 return 0;
459 }
460
461 if (!strcmp(var, "i18n.commitencoding"))
462 return git_config_string(&git_commit_encoding, var, value);
463
464 if (!strcmp(var, "i18n.logoutputencoding"))
465 return git_config_string(&git_log_output_encoding, var, value);
466
467 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
468 pager_use_color = git_config_bool(var,value);
469 return 0;
470 }
471
472 if (!strcmp(var, "core.pager"))
473 return git_config_string(&pager_program, var, value);
474
475 if (!strcmp(var, "core.editor"))
476 return git_config_string(&editor_program, var, value);
477
478 if (!strcmp(var, "core.excludesfile"))
479 return git_config_string(&excludes_file, var, value);
480
481 if (!strcmp(var, "core.whitespace")) {
482 if (!value)
483 return config_error_nonbool(var);
484 whitespace_rule_cfg = parse_whitespace_rule(value);
485 return 0;
486 }
487 if (!strcmp(var, "branch.autosetupmerge")) {
488 if (value && !strcasecmp(value, "always")) {
489 git_branch_track = BRANCH_TRACK_ALWAYS;
490 return 0;
491 }
492 git_branch_track = git_config_bool(var, value);
493 return 0;
494 }
495
496 /* Add other config variables here and to Documentation/config.txt. */
497 return 0;
498 }
499
500 int git_config_from_file(config_fn_t fn, const char *filename)
501 {
502 int ret;
503 FILE *f = fopen(filename, "r");
504
505 ret = -1;
506 if (f) {
507 config_file = f;
508 config_file_name = filename;
509 config_linenr = 1;
510 config_file_eof = 0;
511 ret = git_parse_file(fn);
512 fclose(f);
513 config_file_name = NULL;
514 }
515 return ret;
516 }
517
518 const char *git_etc_gitconfig(void)
519 {
520 static const char *system_wide;
521 if (!system_wide) {
522 system_wide = ETC_GITCONFIG;
523 if (!is_absolute_path(system_wide)) {
524 /* interpret path relative to exec-dir */
525 struct strbuf d = STRBUF_INIT;
526 strbuf_addf(&d, "%s/%s", git_exec_path(), system_wide);
527 system_wide = strbuf_detach(&d, NULL);
528 }
529 }
530 return system_wide;
531 }
532
533 int git_env_bool(const char *k, int def)
534 {
535 const char *v = getenv(k);
536 return v ? git_config_bool(k, v) : def;
537 }
538
539 int git_config_system(void)
540 {
541 return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
542 }
543
544 int git_config_global(void)
545 {
546 return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
547 }
548
549 int git_config(config_fn_t fn)
550 {
551 int ret = 0;
552 char *repo_config = NULL;
553 const char *home = NULL, *filename;
554
555 /* $GIT_CONFIG makes git read _only_ the given config file,
556 * $GIT_CONFIG_LOCAL will make it process it in addition to the
557 * global config file, the same way it would the per-repository
558 * config file otherwise. */
559 filename = getenv(CONFIG_ENVIRONMENT);
560 if (!filename) {
561 if (git_config_system() && !access(git_etc_gitconfig(), R_OK))
562 ret += git_config_from_file(fn, git_etc_gitconfig());
563 home = getenv("HOME");
564 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
565 if (!filename)
566 filename = repo_config = xstrdup(git_path("config"));
567 }
568
569 if (git_config_global() && home) {
570 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
571 if (!access(user_config, R_OK))
572 ret = git_config_from_file(fn, user_config);
573 free(user_config);
574 }
575
576 ret += git_config_from_file(fn, filename);
577 free(repo_config);
578 return ret;
579 }
580
581 /*
582 * Find all the stuff for git_config_set() below.
583 */
584
585 #define MAX_MATCHES 512
586
587 static struct {
588 int baselen;
589 char* key;
590 int do_not_match;
591 regex_t* value_regex;
592 int multi_replace;
593 size_t offset[MAX_MATCHES];
594 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
595 int seen;
596 } store;
597
598 static int matches(const char* key, const char* value)
599 {
600 return !strcmp(key, store.key) &&
601 (store.value_regex == NULL ||
602 (store.do_not_match ^
603 !regexec(store.value_regex, value, 0, NULL, 0)));
604 }
605
606 static int store_aux(const char* key, const char* value)
607 {
608 const char *ep;
609 size_t section_len;
610
611 switch (store.state) {
612 case KEY_SEEN:
613 if (matches(key, value)) {
614 if (store.seen == 1 && store.multi_replace == 0) {
615 fprintf(stderr,
616 "Warning: %s has multiple values\n",
617 key);
618 } else if (store.seen >= MAX_MATCHES) {
619 fprintf(stderr, "Too many matches\n");
620 return 1;
621 }
622
623 store.offset[store.seen] = ftell(config_file);
624 store.seen++;
625 }
626 break;
627 case SECTION_SEEN:
628 /*
629 * What we are looking for is in store.key (both
630 * section and var), and its section part is baselen
631 * long. We found key (again, both section and var).
632 * We would want to know if this key is in the same
633 * section as what we are looking for. We already
634 * know we are in the same section as what should
635 * hold store.key.
636 */
637 ep = strrchr(key, '.');
638 section_len = ep - key;
639
640 if ((section_len != store.baselen) ||
641 memcmp(key, store.key, section_len+1)) {
642 store.state = SECTION_END_SEEN;
643 break;
644 }
645
646 /*
647 * Do not increment matches: this is no match, but we
648 * just made sure we are in the desired section.
649 */
650 store.offset[store.seen] = ftell(config_file);
651 /* fallthru */
652 case SECTION_END_SEEN:
653 case START:
654 if (matches(key, value)) {
655 store.offset[store.seen] = ftell(config_file);
656 store.state = KEY_SEEN;
657 store.seen++;
658 } else {
659 if (strrchr(key, '.') - key == store.baselen &&
660 !strncmp(key, store.key, store.baselen)) {
661 store.state = SECTION_SEEN;
662 store.offset[store.seen] = ftell(config_file);
663 }
664 }
665 }
666 return 0;
667 }
668
669 static int write_error(void)
670 {
671 fprintf(stderr, "Failed to write new configuration file\n");
672
673 /* Same error code as "failed to rename". */
674 return 4;
675 }
676
677 static int store_write_section(int fd, const char* key)
678 {
679 const char *dot;
680 int i, success;
681 struct strbuf sb;
682
683 strbuf_init(&sb, 0);
684 dot = memchr(key, '.', store.baselen);
685 if (dot) {
686 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
687 for (i = dot - key + 1; i < store.baselen; i++) {
688 if (key[i] == '"')
689 strbuf_addch(&sb, '\\');
690 strbuf_addch(&sb, key[i]);
691 }
692 strbuf_addstr(&sb, "\"]\n");
693 } else {
694 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
695 }
696
697 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
698 strbuf_release(&sb);
699
700 return success;
701 }
702
703 static int store_write_pair(int fd, const char* key, const char* value)
704 {
705 int i, success;
706 int length = strlen(key + store.baselen + 1);
707 const char *quote = "";
708 struct strbuf sb;
709
710 /*
711 * Check to see if the value needs to be surrounded with a dq pair.
712 * Note that problematic characters are always backslash-quoted; this
713 * check is about not losing leading or trailing SP and strings that
714 * follow beginning-of-comment characters (i.e. ';' and '#') by the
715 * configuration parser.
716 */
717 if (value[0] == ' ')
718 quote = "\"";
719 for (i = 0; value[i]; i++)
720 if (value[i] == ';' || value[i] == '#')
721 quote = "\"";
722 if (i && value[i - 1] == ' ')
723 quote = "\"";
724
725 strbuf_init(&sb, 0);
726 strbuf_addf(&sb, "\t%.*s = %s",
727 length, key + store.baselen + 1, quote);
728
729 for (i = 0; value[i]; i++)
730 switch (value[i]) {
731 case '\n':
732 strbuf_addstr(&sb, "\\n");
733 break;
734 case '\t':
735 strbuf_addstr(&sb, "\\t");
736 break;
737 case '"':
738 case '\\':
739 strbuf_addch(&sb, '\\');
740 default:
741 strbuf_addch(&sb, value[i]);
742 break;
743 }
744 strbuf_addf(&sb, "%s\n", quote);
745
746 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
747 strbuf_release(&sb);
748
749 return success;
750 }
751
752 static ssize_t find_beginning_of_line(const char* contents, size_t size,
753 size_t offset_, int* found_bracket)
754 {
755 size_t equal_offset = size, bracket_offset = size;
756 ssize_t offset;
757
758 contline:
759 for (offset = offset_-2; offset > 0
760 && contents[offset] != '\n'; offset--)
761 switch (contents[offset]) {
762 case '=': equal_offset = offset; break;
763 case ']': bracket_offset = offset; break;
764 }
765 if (offset > 0 && contents[offset-1] == '\\') {
766 offset_ = offset;
767 goto contline;
768 }
769 if (bracket_offset < equal_offset) {
770 *found_bracket = 1;
771 offset = bracket_offset+1;
772 } else
773 offset++;
774
775 return offset;
776 }
777
778 int git_config_set(const char* key, const char* value)
779 {
780 return git_config_set_multivar(key, value, NULL, 0);
781 }
782
783 /*
784 * If value==NULL, unset in (remove from) config,
785 * if value_regex!=NULL, disregard key/value pairs where value does not match.
786 * if multi_replace==0, nothing, or only one matching key/value is replaced,
787 * else all matching key/values (regardless how many) are removed,
788 * before the new pair is written.
789 *
790 * Returns 0 on success.
791 *
792 * This function does this:
793 *
794 * - it locks the config file by creating ".git/config.lock"
795 *
796 * - it then parses the config using store_aux() as validator to find
797 * the position on the key/value pair to replace. If it is to be unset,
798 * it must be found exactly once.
799 *
800 * - the config file is mmap()ed and the part before the match (if any) is
801 * written to the lock file, then the changed part and the rest.
802 *
803 * - the config file is removed and the lock file rename()d to it.
804 *
805 */
806 int git_config_set_multivar(const char* key, const char* value,
807 const char* value_regex, int multi_replace)
808 {
809 int i, dot;
810 int fd = -1, in_fd;
811 int ret;
812 char* config_filename;
813 struct lock_file *lock = NULL;
814 const char* last_dot = strrchr(key, '.');
815
816 config_filename = getenv(CONFIG_ENVIRONMENT);
817 if (!config_filename) {
818 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
819 if (!config_filename)
820 config_filename = git_path("config");
821 }
822 config_filename = xstrdup(config_filename);
823
824 /*
825 * Since "key" actually contains the section name and the real
826 * key name separated by a dot, we have to know where the dot is.
827 */
828
829 if (last_dot == NULL) {
830 fprintf(stderr, "key does not contain a section: %s\n", key);
831 ret = 2;
832 goto out_free;
833 }
834 store.baselen = last_dot - key;
835
836 store.multi_replace = multi_replace;
837
838 /*
839 * Validate the key and while at it, lower case it for matching.
840 */
841 store.key = xmalloc(strlen(key) + 1);
842 dot = 0;
843 for (i = 0; key[i]; i++) {
844 unsigned char c = key[i];
845 if (c == '.')
846 dot = 1;
847 /* Leave the extended basename untouched.. */
848 if (!dot || i > store.baselen) {
849 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
850 fprintf(stderr, "invalid key: %s\n", key);
851 free(store.key);
852 ret = 1;
853 goto out_free;
854 }
855 c = tolower(c);
856 } else if (c == '\n') {
857 fprintf(stderr, "invalid key (newline): %s\n", key);
858 free(store.key);
859 ret = 1;
860 goto out_free;
861 }
862 store.key[i] = c;
863 }
864 store.key[i] = 0;
865
866 /*
867 * The lock serves a purpose in addition to locking: the new
868 * contents of .git/config will be written into it.
869 */
870 lock = xcalloc(sizeof(struct lock_file), 1);
871 fd = hold_lock_file_for_update(lock, config_filename, 0);
872 if (fd < 0) {
873 fprintf(stderr, "could not lock config file\n");
874 free(store.key);
875 ret = -1;
876 goto out_free;
877 }
878
879 /*
880 * If .git/config does not exist yet, write a minimal version.
881 */
882 in_fd = open(config_filename, O_RDONLY);
883 if ( in_fd < 0 ) {
884 free(store.key);
885
886 if ( ENOENT != errno ) {
887 error("opening %s: %s", config_filename,
888 strerror(errno));
889 ret = 3; /* same as "invalid config file" */
890 goto out_free;
891 }
892 /* if nothing to unset, error out */
893 if (value == NULL) {
894 ret = 5;
895 goto out_free;
896 }
897
898 store.key = (char*)key;
899 if (!store_write_section(fd, key) ||
900 !store_write_pair(fd, key, value))
901 goto write_err_out;
902 } else {
903 struct stat st;
904 char* contents;
905 size_t contents_sz, copy_begin, copy_end;
906 int i, new_line = 0;
907
908 if (value_regex == NULL)
909 store.value_regex = NULL;
910 else {
911 if (value_regex[0] == '!') {
912 store.do_not_match = 1;
913 value_regex++;
914 } else
915 store.do_not_match = 0;
916
917 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
918 if (regcomp(store.value_regex, value_regex,
919 REG_EXTENDED)) {
920 fprintf(stderr, "Invalid pattern: %s\n",
921 value_regex);
922 free(store.value_regex);
923 ret = 6;
924 goto out_free;
925 }
926 }
927
928 store.offset[0] = 0;
929 store.state = START;
930 store.seen = 0;
931
932 /*
933 * After this, store.offset will contain the *end* offset
934 * of the last match, or remain at 0 if no match was found.
935 * As a side effect, we make sure to transform only a valid
936 * existing config file.
937 */
938 if (git_config_from_file(store_aux, config_filename)) {
939 fprintf(stderr, "invalid config file\n");
940 free(store.key);
941 if (store.value_regex != NULL) {
942 regfree(store.value_regex);
943 free(store.value_regex);
944 }
945 ret = 3;
946 goto out_free;
947 }
948
949 free(store.key);
950 if (store.value_regex != NULL) {
951 regfree(store.value_regex);
952 free(store.value_regex);
953 }
954
955 /* if nothing to unset, or too many matches, error out */
956 if ((store.seen == 0 && value == NULL) ||
957 (store.seen > 1 && multi_replace == 0)) {
958 ret = 5;
959 goto out_free;
960 }
961
962 fstat(in_fd, &st);
963 contents_sz = xsize_t(st.st_size);
964 contents = xmmap(NULL, contents_sz, PROT_READ,
965 MAP_PRIVATE, in_fd, 0);
966 close(in_fd);
967
968 if (store.seen == 0)
969 store.seen = 1;
970
971 for (i = 0, copy_begin = 0; i < store.seen; i++) {
972 if (store.offset[i] == 0) {
973 store.offset[i] = copy_end = contents_sz;
974 } else if (store.state != KEY_SEEN) {
975 copy_end = store.offset[i];
976 } else
977 copy_end = find_beginning_of_line(
978 contents, contents_sz,
979 store.offset[i]-2, &new_line);
980
981 if (copy_end > 0 && contents[copy_end-1] != '\n')
982 new_line = 1;
983
984 /* write the first part of the config */
985 if (copy_end > copy_begin) {
986 if (write_in_full(fd, contents + copy_begin,
987 copy_end - copy_begin) <
988 copy_end - copy_begin)
989 goto write_err_out;
990 if (new_line &&
991 write_in_full(fd, "\n", 1) != 1)
992 goto write_err_out;
993 }
994 copy_begin = store.offset[i];
995 }
996
997 /* write the pair (value == NULL means unset) */
998 if (value != NULL) {
999 if (store.state == START) {
1000 if (!store_write_section(fd, key))
1001 goto write_err_out;
1002 }
1003 if (!store_write_pair(fd, key, value))
1004 goto write_err_out;
1005 }
1006
1007 /* write the rest of the config */
1008 if (copy_begin < contents_sz)
1009 if (write_in_full(fd, contents + copy_begin,
1010 contents_sz - copy_begin) <
1011 contents_sz - copy_begin)
1012 goto write_err_out;
1013
1014 munmap(contents, contents_sz);
1015 }
1016
1017 if (commit_lock_file(lock) < 0) {
1018 fprintf(stderr, "Cannot commit config file!\n");
1019 ret = 4;
1020 goto out_free;
1021 }
1022
1023 /*
1024 * lock is committed, so don't try to roll it back below.
1025 * NOTE: Since lockfile.c keeps a linked list of all created
1026 * lock_file structures, it isn't safe to free(lock). It's
1027 * better to just leave it hanging around.
1028 */
1029 lock = NULL;
1030 ret = 0;
1031
1032 out_free:
1033 if (lock)
1034 rollback_lock_file(lock);
1035 free(config_filename);
1036 return ret;
1037
1038 write_err_out:
1039 ret = write_error();
1040 goto out_free;
1041
1042 }
1043
1044 static int section_name_match (const char *buf, const char *name)
1045 {
1046 int i = 0, j = 0, dot = 0;
1047 for (; buf[i] && buf[i] != ']'; i++) {
1048 if (!dot && isspace(buf[i])) {
1049 dot = 1;
1050 if (name[j++] != '.')
1051 break;
1052 for (i++; isspace(buf[i]); i++)
1053 ; /* do nothing */
1054 if (buf[i] != '"')
1055 break;
1056 continue;
1057 }
1058 if (buf[i] == '\\' && dot)
1059 i++;
1060 else if (buf[i] == '"' && dot) {
1061 for (i++; isspace(buf[i]); i++)
1062 ; /* do_nothing */
1063 break;
1064 }
1065 if (buf[i] != name[j++])
1066 break;
1067 }
1068 return (buf[i] == ']' && name[j] == 0);
1069 }
1070
1071 /* if new_name == NULL, the section is removed instead */
1072 int git_config_rename_section(const char *old_name, const char *new_name)
1073 {
1074 int ret = 0, remove = 0;
1075 char *config_filename;
1076 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1077 int out_fd;
1078 char buf[1024];
1079
1080 config_filename = getenv(CONFIG_ENVIRONMENT);
1081 if (!config_filename) {
1082 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
1083 if (!config_filename)
1084 config_filename = git_path("config");
1085 }
1086 config_filename = xstrdup(config_filename);
1087 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1088 if (out_fd < 0) {
1089 ret = error("Could not lock config file!");
1090 goto out;
1091 }
1092
1093 if (!(config_file = fopen(config_filename, "rb"))) {
1094 /* no config file means nothing to rename, no error */
1095 goto unlock_and_out;
1096 }
1097
1098 while (fgets(buf, sizeof(buf), config_file)) {
1099 int i;
1100 int length;
1101 for (i = 0; buf[i] && isspace(buf[i]); i++)
1102 ; /* do nothing */
1103 if (buf[i] == '[') {
1104 /* it's a section */
1105 if (section_name_match (&buf[i+1], old_name)) {
1106 ret++;
1107 if (new_name == NULL) {
1108 remove = 1;
1109 continue;
1110 }
1111 store.baselen = strlen(new_name);
1112 if (!store_write_section(out_fd, new_name)) {
1113 ret = write_error();
1114 goto out;
1115 }
1116 continue;
1117 }
1118 remove = 0;
1119 }
1120 if (remove)
1121 continue;
1122 length = strlen(buf);
1123 if (write_in_full(out_fd, buf, length) != length) {
1124 ret = write_error();
1125 goto out;
1126 }
1127 }
1128 fclose(config_file);
1129 unlock_and_out:
1130 if (commit_lock_file(lock) < 0)
1131 ret = error("Cannot commit config file!");
1132 out:
1133 free(config_filename);
1134 return ret;
1135 }
1136
1137 /*
1138 * Call this to report error for your variable that should not
1139 * get a boolean value (i.e. "[my] var" means "true").
1140 */
1141 int config_error_nonbool(const char *var)
1142 {
1143 return error("Missing value for '%s'", var);
1144 }