Merge branch 'jk/noetcconfig'
[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 int git_config_int(const char *name, const char *value)
284 {
285 long ret;
286 if (!git_parse_long(value, &ret))
287 die("bad config value for '%s' in %s", name, config_file_name);
288 return ret;
289 }
290
291 unsigned long git_config_ulong(const char *name, const char *value)
292 {
293 unsigned long ret;
294 if (!git_parse_ulong(value, &ret))
295 die("bad config value for '%s' in %s", name, config_file_name);
296 return ret;
297 }
298
299 int git_config_bool(const char *name, const char *value)
300 {
301 if (!value)
302 return 1;
303 if (!*value)
304 return 0;
305 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
306 return 1;
307 if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
308 return 0;
309 return git_config_int(name, value) != 0;
310 }
311
312 int git_config_string(const char **dest, const char *var, const char *value)
313 {
314 if (!value)
315 return config_error_nonbool(var);
316 *dest = xstrdup(value);
317 return 0;
318 }
319
320 int git_default_config(const char *var, const char *value)
321 {
322 /* This needs a better name */
323 if (!strcmp(var, "core.filemode")) {
324 trust_executable_bit = git_config_bool(var, value);
325 return 0;
326 }
327
328 if (!strcmp(var, "core.quotepath")) {
329 quote_path_fully = git_config_bool(var, value);
330 return 0;
331 }
332
333 if (!strcmp(var, "core.symlinks")) {
334 has_symlinks = git_config_bool(var, value);
335 return 0;
336 }
337
338 if (!strcmp(var, "core.bare")) {
339 is_bare_repository_cfg = git_config_bool(var, value);
340 return 0;
341 }
342
343 if (!strcmp(var, "core.ignorestat")) {
344 assume_unchanged = git_config_bool(var, value);
345 return 0;
346 }
347
348 if (!strcmp(var, "core.prefersymlinkrefs")) {
349 prefer_symlink_refs = git_config_bool(var, value);
350 return 0;
351 }
352
353 if (!strcmp(var, "core.logallrefupdates")) {
354 log_all_ref_updates = git_config_bool(var, value);
355 return 0;
356 }
357
358 if (!strcmp(var, "core.warnambiguousrefs")) {
359 warn_ambiguous_refs = git_config_bool(var, value);
360 return 0;
361 }
362
363 if (!strcmp(var, "core.loosecompression")) {
364 int level = git_config_int(var, value);
365 if (level == -1)
366 level = Z_DEFAULT_COMPRESSION;
367 else if (level < 0 || level > Z_BEST_COMPRESSION)
368 die("bad zlib compression level %d", level);
369 zlib_compression_level = level;
370 zlib_compression_seen = 1;
371 return 0;
372 }
373
374 if (!strcmp(var, "core.compression")) {
375 int level = git_config_int(var, value);
376 if (level == -1)
377 level = Z_DEFAULT_COMPRESSION;
378 else if (level < 0 || level > Z_BEST_COMPRESSION)
379 die("bad zlib compression level %d", level);
380 core_compression_level = level;
381 core_compression_seen = 1;
382 if (!zlib_compression_seen)
383 zlib_compression_level = level;
384 return 0;
385 }
386
387 if (!strcmp(var, "core.packedgitwindowsize")) {
388 int pgsz_x2 = getpagesize() * 2;
389 packed_git_window_size = git_config_int(var, value);
390
391 /* This value must be multiple of (pagesize * 2) */
392 packed_git_window_size /= pgsz_x2;
393 if (packed_git_window_size < 1)
394 packed_git_window_size = 1;
395 packed_git_window_size *= pgsz_x2;
396 return 0;
397 }
398
399 if (!strcmp(var, "core.packedgitlimit")) {
400 packed_git_limit = git_config_int(var, value);
401 return 0;
402 }
403
404 if (!strcmp(var, "core.deltabasecachelimit")) {
405 delta_base_cache_limit = git_config_int(var, value);
406 return 0;
407 }
408
409 if (!strcmp(var, "core.autocrlf")) {
410 if (value && !strcasecmp(value, "input")) {
411 auto_crlf = -1;
412 return 0;
413 }
414 auto_crlf = git_config_bool(var, value);
415 return 0;
416 }
417
418 if (!strcmp(var, "user.name")) {
419 if (!value)
420 return config_error_nonbool(var);
421 strlcpy(git_default_name, value, sizeof(git_default_name));
422 return 0;
423 }
424
425 if (!strcmp(var, "user.email")) {
426 if (!value)
427 return config_error_nonbool(var);
428 strlcpy(git_default_email, value, sizeof(git_default_email));
429 return 0;
430 }
431
432 if (!strcmp(var, "i18n.commitencoding"))
433 return git_config_string(&git_commit_encoding, var, value);
434
435 if (!strcmp(var, "i18n.logoutputencoding"))
436 return git_config_string(&git_log_output_encoding, var, value);
437
438 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
439 pager_use_color = git_config_bool(var,value);
440 return 0;
441 }
442
443 if (!strcmp(var, "core.pager"))
444 return git_config_string(&pager_program, var, value);
445
446 if (!strcmp(var, "core.editor"))
447 return git_config_string(&editor_program, var, value);
448
449 if (!strcmp(var, "core.excludesfile"))
450 return git_config_string(&excludes_file, var, value);
451
452 if (!strcmp(var, "core.whitespace")) {
453 if (!value)
454 return config_error_nonbool(var);
455 whitespace_rule_cfg = parse_whitespace_rule(value);
456 return 0;
457 }
458
459 /* Add other config variables here and to Documentation/config.txt. */
460 return 0;
461 }
462
463 int git_config_from_file(config_fn_t fn, const char *filename)
464 {
465 int ret;
466 FILE *f = fopen(filename, "r");
467
468 ret = -1;
469 if (f) {
470 config_file = f;
471 config_file_name = filename;
472 config_linenr = 1;
473 config_file_eof = 0;
474 ret = git_parse_file(fn);
475 fclose(f);
476 config_file_name = NULL;
477 }
478 return ret;
479 }
480
481 const char *git_etc_gitconfig(void)
482 {
483 static const char *system_wide;
484 if (!system_wide) {
485 system_wide = ETC_GITCONFIG;
486 if (!is_absolute_path(system_wide)) {
487 /* interpret path relative to exec-dir */
488 struct strbuf d = STRBUF_INIT;
489 strbuf_addf(&d, "%s/%s", git_exec_path(), system_wide);
490 system_wide = strbuf_detach(&d, NULL);
491 }
492 }
493 return system_wide;
494 }
495
496 int git_env_bool(const char *k, int def)
497 {
498 const char *v = getenv(k);
499 return v ? git_config_bool(k, v) : def;
500 }
501
502 int git_config_system(void)
503 {
504 return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
505 }
506
507 int git_config_global(void)
508 {
509 return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
510 }
511
512 int git_config(config_fn_t fn)
513 {
514 int ret = 0;
515 char *repo_config = NULL;
516 const char *home = NULL, *filename;
517
518 /* $GIT_CONFIG makes git read _only_ the given config file,
519 * $GIT_CONFIG_LOCAL will make it process it in addition to the
520 * global config file, the same way it would the per-repository
521 * config file otherwise. */
522 filename = getenv(CONFIG_ENVIRONMENT);
523 if (!filename) {
524 if (git_config_system() && !access(git_etc_gitconfig(), R_OK))
525 ret += git_config_from_file(fn, git_etc_gitconfig());
526 home = getenv("HOME");
527 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
528 if (!filename)
529 filename = repo_config = xstrdup(git_path("config"));
530 }
531
532 if (git_config_global() && home) {
533 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
534 if (!access(user_config, R_OK))
535 ret = git_config_from_file(fn, user_config);
536 free(user_config);
537 }
538
539 ret += git_config_from_file(fn, filename);
540 free(repo_config);
541 return ret;
542 }
543
544 /*
545 * Find all the stuff for git_config_set() below.
546 */
547
548 #define MAX_MATCHES 512
549
550 static struct {
551 int baselen;
552 char* key;
553 int do_not_match;
554 regex_t* value_regex;
555 int multi_replace;
556 size_t offset[MAX_MATCHES];
557 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
558 int seen;
559 } store;
560
561 static int matches(const char* key, const char* value)
562 {
563 return !strcmp(key, store.key) &&
564 (store.value_regex == NULL ||
565 (store.do_not_match ^
566 !regexec(store.value_regex, value, 0, NULL, 0)));
567 }
568
569 static int store_aux(const char* key, const char* value)
570 {
571 const char *ep;
572 size_t section_len;
573
574 switch (store.state) {
575 case KEY_SEEN:
576 if (matches(key, value)) {
577 if (store.seen == 1 && store.multi_replace == 0) {
578 fprintf(stderr,
579 "Warning: %s has multiple values\n",
580 key);
581 } else if (store.seen >= MAX_MATCHES) {
582 fprintf(stderr, "Too many matches\n");
583 return 1;
584 }
585
586 store.offset[store.seen] = ftell(config_file);
587 store.seen++;
588 }
589 break;
590 case SECTION_SEEN:
591 /*
592 * What we are looking for is in store.key (both
593 * section and var), and its section part is baselen
594 * long. We found key (again, both section and var).
595 * We would want to know if this key is in the same
596 * section as what we are looking for. We already
597 * know we are in the same section as what should
598 * hold store.key.
599 */
600 ep = strrchr(key, '.');
601 section_len = ep - key;
602
603 if ((section_len != store.baselen) ||
604 memcmp(key, store.key, section_len+1)) {
605 store.state = SECTION_END_SEEN;
606 break;
607 }
608
609 /*
610 * Do not increment matches: this is no match, but we
611 * just made sure we are in the desired section.
612 */
613 store.offset[store.seen] = ftell(config_file);
614 /* fallthru */
615 case SECTION_END_SEEN:
616 case START:
617 if (matches(key, value)) {
618 store.offset[store.seen] = ftell(config_file);
619 store.state = KEY_SEEN;
620 store.seen++;
621 } else {
622 if (strrchr(key, '.') - key == store.baselen &&
623 !strncmp(key, store.key, store.baselen)) {
624 store.state = SECTION_SEEN;
625 store.offset[store.seen] = ftell(config_file);
626 }
627 }
628 }
629 return 0;
630 }
631
632 static int write_error(void)
633 {
634 fprintf(stderr, "Failed to write new configuration file\n");
635
636 /* Same error code as "failed to rename". */
637 return 4;
638 }
639
640 static int store_write_section(int fd, const char* key)
641 {
642 const char *dot;
643 int i, success;
644 struct strbuf sb;
645
646 strbuf_init(&sb, 0);
647 dot = memchr(key, '.', store.baselen);
648 if (dot) {
649 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
650 for (i = dot - key + 1; i < store.baselen; i++) {
651 if (key[i] == '"')
652 strbuf_addch(&sb, '\\');
653 strbuf_addch(&sb, key[i]);
654 }
655 strbuf_addstr(&sb, "\"]\n");
656 } else {
657 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
658 }
659
660 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
661 strbuf_release(&sb);
662
663 return success;
664 }
665
666 static int store_write_pair(int fd, const char* key, const char* value)
667 {
668 int i, success;
669 int length = strlen(key + store.baselen + 1);
670 const char *quote = "";
671 struct strbuf sb;
672
673 /*
674 * Check to see if the value needs to be surrounded with a dq pair.
675 * Note that problematic characters are always backslash-quoted; this
676 * check is about not losing leading or trailing SP and strings that
677 * follow beginning-of-comment characters (i.e. ';' and '#') by the
678 * configuration parser.
679 */
680 if (value[0] == ' ')
681 quote = "\"";
682 for (i = 0; value[i]; i++)
683 if (value[i] == ';' || value[i] == '#')
684 quote = "\"";
685 if (i && value[i - 1] == ' ')
686 quote = "\"";
687
688 strbuf_init(&sb, 0);
689 strbuf_addf(&sb, "\t%.*s = %s",
690 length, key + store.baselen + 1, quote);
691
692 for (i = 0; value[i]; i++)
693 switch (value[i]) {
694 case '\n':
695 strbuf_addstr(&sb, "\\n");
696 break;
697 case '\t':
698 strbuf_addstr(&sb, "\\t");
699 break;
700 case '"':
701 case '\\':
702 strbuf_addch(&sb, '\\');
703 default:
704 strbuf_addch(&sb, value[i]);
705 break;
706 }
707 strbuf_addf(&sb, "%s\n", quote);
708
709 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
710 strbuf_release(&sb);
711
712 return success;
713 }
714
715 static ssize_t find_beginning_of_line(const char* contents, size_t size,
716 size_t offset_, int* found_bracket)
717 {
718 size_t equal_offset = size, bracket_offset = size;
719 ssize_t offset;
720
721 contline:
722 for (offset = offset_-2; offset > 0
723 && contents[offset] != '\n'; offset--)
724 switch (contents[offset]) {
725 case '=': equal_offset = offset; break;
726 case ']': bracket_offset = offset; break;
727 }
728 if (offset > 0 && contents[offset-1] == '\\') {
729 offset_ = offset;
730 goto contline;
731 }
732 if (bracket_offset < equal_offset) {
733 *found_bracket = 1;
734 offset = bracket_offset+1;
735 } else
736 offset++;
737
738 return offset;
739 }
740
741 int git_config_set(const char* key, const char* value)
742 {
743 return git_config_set_multivar(key, value, NULL, 0);
744 }
745
746 /*
747 * If value==NULL, unset in (remove from) config,
748 * if value_regex!=NULL, disregard key/value pairs where value does not match.
749 * if multi_replace==0, nothing, or only one matching key/value is replaced,
750 * else all matching key/values (regardless how many) are removed,
751 * before the new pair is written.
752 *
753 * Returns 0 on success.
754 *
755 * This function does this:
756 *
757 * - it locks the config file by creating ".git/config.lock"
758 *
759 * - it then parses the config using store_aux() as validator to find
760 * the position on the key/value pair to replace. If it is to be unset,
761 * it must be found exactly once.
762 *
763 * - the config file is mmap()ed and the part before the match (if any) is
764 * written to the lock file, then the changed part and the rest.
765 *
766 * - the config file is removed and the lock file rename()d to it.
767 *
768 */
769 int git_config_set_multivar(const char* key, const char* value,
770 const char* value_regex, int multi_replace)
771 {
772 int i, dot;
773 int fd = -1, in_fd;
774 int ret;
775 char* config_filename;
776 struct lock_file *lock = NULL;
777 const char* last_dot = strrchr(key, '.');
778
779 config_filename = getenv(CONFIG_ENVIRONMENT);
780 if (!config_filename) {
781 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
782 if (!config_filename)
783 config_filename = git_path("config");
784 }
785 config_filename = xstrdup(config_filename);
786
787 /*
788 * Since "key" actually contains the section name and the real
789 * key name separated by a dot, we have to know where the dot is.
790 */
791
792 if (last_dot == NULL) {
793 fprintf(stderr, "key does not contain a section: %s\n", key);
794 ret = 2;
795 goto out_free;
796 }
797 store.baselen = last_dot - key;
798
799 store.multi_replace = multi_replace;
800
801 /*
802 * Validate the key and while at it, lower case it for matching.
803 */
804 store.key = xmalloc(strlen(key) + 1);
805 dot = 0;
806 for (i = 0; key[i]; i++) {
807 unsigned char c = key[i];
808 if (c == '.')
809 dot = 1;
810 /* Leave the extended basename untouched.. */
811 if (!dot || i > store.baselen) {
812 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
813 fprintf(stderr, "invalid key: %s\n", key);
814 free(store.key);
815 ret = 1;
816 goto out_free;
817 }
818 c = tolower(c);
819 } else if (c == '\n') {
820 fprintf(stderr, "invalid key (newline): %s\n", key);
821 free(store.key);
822 ret = 1;
823 goto out_free;
824 }
825 store.key[i] = c;
826 }
827 store.key[i] = 0;
828
829 /*
830 * The lock serves a purpose in addition to locking: the new
831 * contents of .git/config will be written into it.
832 */
833 lock = xcalloc(sizeof(struct lock_file), 1);
834 fd = hold_lock_file_for_update(lock, config_filename, 0);
835 if (fd < 0) {
836 fprintf(stderr, "could not lock config file\n");
837 free(store.key);
838 ret = -1;
839 goto out_free;
840 }
841
842 /*
843 * If .git/config does not exist yet, write a minimal version.
844 */
845 in_fd = open(config_filename, O_RDONLY);
846 if ( in_fd < 0 ) {
847 free(store.key);
848
849 if ( ENOENT != errno ) {
850 error("opening %s: %s", config_filename,
851 strerror(errno));
852 ret = 3; /* same as "invalid config file" */
853 goto out_free;
854 }
855 /* if nothing to unset, error out */
856 if (value == NULL) {
857 ret = 5;
858 goto out_free;
859 }
860
861 store.key = (char*)key;
862 if (!store_write_section(fd, key) ||
863 !store_write_pair(fd, key, value))
864 goto write_err_out;
865 } else {
866 struct stat st;
867 char* contents;
868 size_t contents_sz, copy_begin, copy_end;
869 int i, new_line = 0;
870
871 if (value_regex == NULL)
872 store.value_regex = NULL;
873 else {
874 if (value_regex[0] == '!') {
875 store.do_not_match = 1;
876 value_regex++;
877 } else
878 store.do_not_match = 0;
879
880 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
881 if (regcomp(store.value_regex, value_regex,
882 REG_EXTENDED)) {
883 fprintf(stderr, "Invalid pattern: %s\n",
884 value_regex);
885 free(store.value_regex);
886 ret = 6;
887 goto out_free;
888 }
889 }
890
891 store.offset[0] = 0;
892 store.state = START;
893 store.seen = 0;
894
895 /*
896 * After this, store.offset will contain the *end* offset
897 * of the last match, or remain at 0 if no match was found.
898 * As a side effect, we make sure to transform only a valid
899 * existing config file.
900 */
901 if (git_config_from_file(store_aux, config_filename)) {
902 fprintf(stderr, "invalid config file\n");
903 free(store.key);
904 if (store.value_regex != NULL) {
905 regfree(store.value_regex);
906 free(store.value_regex);
907 }
908 ret = 3;
909 goto out_free;
910 }
911
912 free(store.key);
913 if (store.value_regex != NULL) {
914 regfree(store.value_regex);
915 free(store.value_regex);
916 }
917
918 /* if nothing to unset, or too many matches, error out */
919 if ((store.seen == 0 && value == NULL) ||
920 (store.seen > 1 && multi_replace == 0)) {
921 ret = 5;
922 goto out_free;
923 }
924
925 fstat(in_fd, &st);
926 contents_sz = xsize_t(st.st_size);
927 contents = xmmap(NULL, contents_sz, PROT_READ,
928 MAP_PRIVATE, in_fd, 0);
929 close(in_fd);
930
931 if (store.seen == 0)
932 store.seen = 1;
933
934 for (i = 0, copy_begin = 0; i < store.seen; i++) {
935 if (store.offset[i] == 0) {
936 store.offset[i] = copy_end = contents_sz;
937 } else if (store.state != KEY_SEEN) {
938 copy_end = store.offset[i];
939 } else
940 copy_end = find_beginning_of_line(
941 contents, contents_sz,
942 store.offset[i]-2, &new_line);
943
944 if (copy_end > 0 && contents[copy_end-1] != '\n')
945 new_line = 1;
946
947 /* write the first part of the config */
948 if (copy_end > copy_begin) {
949 if (write_in_full(fd, contents + copy_begin,
950 copy_end - copy_begin) <
951 copy_end - copy_begin)
952 goto write_err_out;
953 if (new_line &&
954 write_in_full(fd, "\n", 1) != 1)
955 goto write_err_out;
956 }
957 copy_begin = store.offset[i];
958 }
959
960 /* write the pair (value == NULL means unset) */
961 if (value != NULL) {
962 if (store.state == START) {
963 if (!store_write_section(fd, key))
964 goto write_err_out;
965 }
966 if (!store_write_pair(fd, key, value))
967 goto write_err_out;
968 }
969
970 /* write the rest of the config */
971 if (copy_begin < contents_sz)
972 if (write_in_full(fd, contents + copy_begin,
973 contents_sz - copy_begin) <
974 contents_sz - copy_begin)
975 goto write_err_out;
976
977 munmap(contents, contents_sz);
978 }
979
980 if (commit_lock_file(lock) < 0) {
981 fprintf(stderr, "Cannot commit config file!\n");
982 ret = 4;
983 goto out_free;
984 }
985
986 /*
987 * lock is committed, so don't try to roll it back below.
988 * NOTE: Since lockfile.c keeps a linked list of all created
989 * lock_file structures, it isn't safe to free(lock). It's
990 * better to just leave it hanging around.
991 */
992 lock = NULL;
993 ret = 0;
994
995 out_free:
996 if (lock)
997 rollback_lock_file(lock);
998 free(config_filename);
999 return ret;
1000
1001 write_err_out:
1002 ret = write_error();
1003 goto out_free;
1004
1005 }
1006
1007 static int section_name_match (const char *buf, const char *name)
1008 {
1009 int i = 0, j = 0, dot = 0;
1010 for (; buf[i] && buf[i] != ']'; i++) {
1011 if (!dot && isspace(buf[i])) {
1012 dot = 1;
1013 if (name[j++] != '.')
1014 break;
1015 for (i++; isspace(buf[i]); i++)
1016 ; /* do nothing */
1017 if (buf[i] != '"')
1018 break;
1019 continue;
1020 }
1021 if (buf[i] == '\\' && dot)
1022 i++;
1023 else if (buf[i] == '"' && dot) {
1024 for (i++; isspace(buf[i]); i++)
1025 ; /* do_nothing */
1026 break;
1027 }
1028 if (buf[i] != name[j++])
1029 break;
1030 }
1031 return (buf[i] == ']' && name[j] == 0);
1032 }
1033
1034 /* if new_name == NULL, the section is removed instead */
1035 int git_config_rename_section(const char *old_name, const char *new_name)
1036 {
1037 int ret = 0, remove = 0;
1038 char *config_filename;
1039 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1040 int out_fd;
1041 char buf[1024];
1042
1043 config_filename = getenv(CONFIG_ENVIRONMENT);
1044 if (!config_filename) {
1045 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
1046 if (!config_filename)
1047 config_filename = git_path("config");
1048 }
1049 config_filename = xstrdup(config_filename);
1050 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1051 if (out_fd < 0) {
1052 ret = error("Could not lock config file!");
1053 goto out;
1054 }
1055
1056 if (!(config_file = fopen(config_filename, "rb"))) {
1057 /* no config file means nothing to rename, no error */
1058 goto unlock_and_out;
1059 }
1060
1061 while (fgets(buf, sizeof(buf), config_file)) {
1062 int i;
1063 int length;
1064 for (i = 0; buf[i] && isspace(buf[i]); i++)
1065 ; /* do nothing */
1066 if (buf[i] == '[') {
1067 /* it's a section */
1068 if (section_name_match (&buf[i+1], old_name)) {
1069 ret++;
1070 if (new_name == NULL) {
1071 remove = 1;
1072 continue;
1073 }
1074 store.baselen = strlen(new_name);
1075 if (!store_write_section(out_fd, new_name)) {
1076 ret = write_error();
1077 goto out;
1078 }
1079 continue;
1080 }
1081 remove = 0;
1082 }
1083 if (remove)
1084 continue;
1085 length = strlen(buf);
1086 if (write_in_full(out_fd, buf, length) != length) {
1087 ret = write_error();
1088 goto out;
1089 }
1090 }
1091 fclose(config_file);
1092 unlock_and_out:
1093 if (commit_lock_file(lock) < 0)
1094 ret = error("Cannot commit config file!");
1095 out:
1096 free(config_filename);
1097 return ret;
1098 }
1099
1100 /*
1101 * Call this to report error for your variable that should not
1102 * get a boolean value (i.e. "[my] var" means "true").
1103 */
1104 int config_error_nonbool(const char *var)
1105 {
1106 return error("Missing value for '%s'", var);
1107 }