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