Merge branch 'lt/core-optim'
[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 if (!strcmp(var, "branch.autosetuprebase")) {
496 if (!value)
497 return config_error_nonbool(var);
498 else if (!strcmp(value, "never"))
499 autorebase = AUTOREBASE_NEVER;
500 else if (!strcmp(value, "local"))
501 autorebase = AUTOREBASE_LOCAL;
502 else if (!strcmp(value, "remote"))
503 autorebase = AUTOREBASE_REMOTE;
504 else if (!strcmp(value, "always"))
505 autorebase = AUTOREBASE_ALWAYS;
506 else
507 return error("Malformed value for %s", var);
508 return 0;
509 }
510
511 /* Add other config variables here and to Documentation/config.txt. */
512 return 0;
513 }
514
515 int git_config_from_file(config_fn_t fn, const char *filename)
516 {
517 int ret;
518 FILE *f = fopen(filename, "r");
519
520 ret = -1;
521 if (f) {
522 config_file = f;
523 config_file_name = filename;
524 config_linenr = 1;
525 config_file_eof = 0;
526 ret = git_parse_file(fn);
527 fclose(f);
528 config_file_name = NULL;
529 }
530 return ret;
531 }
532
533 const char *git_etc_gitconfig(void)
534 {
535 static const char *system_wide;
536 if (!system_wide) {
537 system_wide = ETC_GITCONFIG;
538 if (!is_absolute_path(system_wide)) {
539 /* interpret path relative to exec-dir */
540 struct strbuf d = STRBUF_INIT;
541 strbuf_addf(&d, "%s/%s", git_exec_path(), system_wide);
542 system_wide = strbuf_detach(&d, NULL);
543 }
544 }
545 return system_wide;
546 }
547
548 int git_env_bool(const char *k, int def)
549 {
550 const char *v = getenv(k);
551 return v ? git_config_bool(k, v) : def;
552 }
553
554 int git_config_system(void)
555 {
556 return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
557 }
558
559 int git_config_global(void)
560 {
561 return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
562 }
563
564 int git_config(config_fn_t fn)
565 {
566 int ret = 0;
567 char *repo_config = NULL;
568 const char *home = NULL, *filename;
569
570 /* $GIT_CONFIG makes git read _only_ the given config file,
571 * $GIT_CONFIG_LOCAL will make it process it in addition to the
572 * global config file, the same way it would the per-repository
573 * config file otherwise. */
574 filename = getenv(CONFIG_ENVIRONMENT);
575 if (!filename) {
576 if (git_config_system() && !access(git_etc_gitconfig(), R_OK))
577 ret += git_config_from_file(fn, git_etc_gitconfig());
578 home = getenv("HOME");
579 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
580 if (!filename)
581 filename = repo_config = xstrdup(git_path("config"));
582 }
583
584 if (git_config_global() && home) {
585 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
586 if (!access(user_config, R_OK))
587 ret = git_config_from_file(fn, user_config);
588 free(user_config);
589 }
590
591 ret += git_config_from_file(fn, filename);
592 free(repo_config);
593 return ret;
594 }
595
596 /*
597 * Find all the stuff for git_config_set() below.
598 */
599
600 #define MAX_MATCHES 512
601
602 static struct {
603 int baselen;
604 char* key;
605 int do_not_match;
606 regex_t* value_regex;
607 int multi_replace;
608 size_t offset[MAX_MATCHES];
609 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
610 int seen;
611 } store;
612
613 static int matches(const char* key, const char* value)
614 {
615 return !strcmp(key, store.key) &&
616 (store.value_regex == NULL ||
617 (store.do_not_match ^
618 !regexec(store.value_regex, value, 0, NULL, 0)));
619 }
620
621 static int store_aux(const char* key, const char* value)
622 {
623 const char *ep;
624 size_t section_len;
625
626 switch (store.state) {
627 case KEY_SEEN:
628 if (matches(key, value)) {
629 if (store.seen == 1 && store.multi_replace == 0) {
630 fprintf(stderr,
631 "Warning: %s has multiple values\n",
632 key);
633 } else if (store.seen >= MAX_MATCHES) {
634 fprintf(stderr, "Too many matches\n");
635 return 1;
636 }
637
638 store.offset[store.seen] = ftell(config_file);
639 store.seen++;
640 }
641 break;
642 case SECTION_SEEN:
643 /*
644 * What we are looking for is in store.key (both
645 * section and var), and its section part is baselen
646 * long. We found key (again, both section and var).
647 * We would want to know if this key is in the same
648 * section as what we are looking for. We already
649 * know we are in the same section as what should
650 * hold store.key.
651 */
652 ep = strrchr(key, '.');
653 section_len = ep - key;
654
655 if ((section_len != store.baselen) ||
656 memcmp(key, store.key, section_len+1)) {
657 store.state = SECTION_END_SEEN;
658 break;
659 }
660
661 /*
662 * Do not increment matches: this is no match, but we
663 * just made sure we are in the desired section.
664 */
665 store.offset[store.seen] = ftell(config_file);
666 /* fallthru */
667 case SECTION_END_SEEN:
668 case START:
669 if (matches(key, value)) {
670 store.offset[store.seen] = ftell(config_file);
671 store.state = KEY_SEEN;
672 store.seen++;
673 } else {
674 if (strrchr(key, '.') - key == store.baselen &&
675 !strncmp(key, store.key, store.baselen)) {
676 store.state = SECTION_SEEN;
677 store.offset[store.seen] = ftell(config_file);
678 }
679 }
680 }
681 return 0;
682 }
683
684 static int write_error(void)
685 {
686 fprintf(stderr, "Failed to write new configuration file\n");
687
688 /* Same error code as "failed to rename". */
689 return 4;
690 }
691
692 static int store_write_section(int fd, const char* key)
693 {
694 const char *dot;
695 int i, success;
696 struct strbuf sb;
697
698 strbuf_init(&sb, 0);
699 dot = memchr(key, '.', store.baselen);
700 if (dot) {
701 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
702 for (i = dot - key + 1; i < store.baselen; i++) {
703 if (key[i] == '"')
704 strbuf_addch(&sb, '\\');
705 strbuf_addch(&sb, key[i]);
706 }
707 strbuf_addstr(&sb, "\"]\n");
708 } else {
709 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
710 }
711
712 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
713 strbuf_release(&sb);
714
715 return success;
716 }
717
718 static int store_write_pair(int fd, const char* key, const char* value)
719 {
720 int i, success;
721 int length = strlen(key + store.baselen + 1);
722 const char *quote = "";
723 struct strbuf sb;
724
725 /*
726 * Check to see if the value needs to be surrounded with a dq pair.
727 * Note that problematic characters are always backslash-quoted; this
728 * check is about not losing leading or trailing SP and strings that
729 * follow beginning-of-comment characters (i.e. ';' and '#') by the
730 * configuration parser.
731 */
732 if (value[0] == ' ')
733 quote = "\"";
734 for (i = 0; value[i]; i++)
735 if (value[i] == ';' || value[i] == '#')
736 quote = "\"";
737 if (i && value[i - 1] == ' ')
738 quote = "\"";
739
740 strbuf_init(&sb, 0);
741 strbuf_addf(&sb, "\t%.*s = %s",
742 length, key + store.baselen + 1, quote);
743
744 for (i = 0; value[i]; i++)
745 switch (value[i]) {
746 case '\n':
747 strbuf_addstr(&sb, "\\n");
748 break;
749 case '\t':
750 strbuf_addstr(&sb, "\\t");
751 break;
752 case '"':
753 case '\\':
754 strbuf_addch(&sb, '\\');
755 default:
756 strbuf_addch(&sb, value[i]);
757 break;
758 }
759 strbuf_addf(&sb, "%s\n", quote);
760
761 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
762 strbuf_release(&sb);
763
764 return success;
765 }
766
767 static ssize_t find_beginning_of_line(const char* contents, size_t size,
768 size_t offset_, int* found_bracket)
769 {
770 size_t equal_offset = size, bracket_offset = size;
771 ssize_t offset;
772
773 contline:
774 for (offset = offset_-2; offset > 0
775 && contents[offset] != '\n'; offset--)
776 switch (contents[offset]) {
777 case '=': equal_offset = offset; break;
778 case ']': bracket_offset = offset; break;
779 }
780 if (offset > 0 && contents[offset-1] == '\\') {
781 offset_ = offset;
782 goto contline;
783 }
784 if (bracket_offset < equal_offset) {
785 *found_bracket = 1;
786 offset = bracket_offset+1;
787 } else
788 offset++;
789
790 return offset;
791 }
792
793 int git_config_set(const char* key, const char* value)
794 {
795 return git_config_set_multivar(key, value, NULL, 0);
796 }
797
798 /*
799 * If value==NULL, unset in (remove from) config,
800 * if value_regex!=NULL, disregard key/value pairs where value does not match.
801 * if multi_replace==0, nothing, or only one matching key/value is replaced,
802 * else all matching key/values (regardless how many) are removed,
803 * before the new pair is written.
804 *
805 * Returns 0 on success.
806 *
807 * This function does this:
808 *
809 * - it locks the config file by creating ".git/config.lock"
810 *
811 * - it then parses the config using store_aux() as validator to find
812 * the position on the key/value pair to replace. If it is to be unset,
813 * it must be found exactly once.
814 *
815 * - the config file is mmap()ed and the part before the match (if any) is
816 * written to the lock file, then the changed part and the rest.
817 *
818 * - the config file is removed and the lock file rename()d to it.
819 *
820 */
821 int git_config_set_multivar(const char* key, const char* value,
822 const char* value_regex, int multi_replace)
823 {
824 int i, dot;
825 int fd = -1, in_fd;
826 int ret;
827 char* config_filename;
828 struct lock_file *lock = NULL;
829 const char* last_dot = strrchr(key, '.');
830
831 config_filename = getenv(CONFIG_ENVIRONMENT);
832 if (!config_filename) {
833 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
834 if (!config_filename)
835 config_filename = git_path("config");
836 }
837 config_filename = xstrdup(config_filename);
838
839 /*
840 * Since "key" actually contains the section name and the real
841 * key name separated by a dot, we have to know where the dot is.
842 */
843
844 if (last_dot == NULL) {
845 fprintf(stderr, "key does not contain a section: %s\n", key);
846 ret = 2;
847 goto out_free;
848 }
849 store.baselen = last_dot - key;
850
851 store.multi_replace = multi_replace;
852
853 /*
854 * Validate the key and while at it, lower case it for matching.
855 */
856 store.key = xmalloc(strlen(key) + 1);
857 dot = 0;
858 for (i = 0; key[i]; i++) {
859 unsigned char c = key[i];
860 if (c == '.')
861 dot = 1;
862 /* Leave the extended basename untouched.. */
863 if (!dot || i > store.baselen) {
864 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
865 fprintf(stderr, "invalid key: %s\n", key);
866 free(store.key);
867 ret = 1;
868 goto out_free;
869 }
870 c = tolower(c);
871 } else if (c == '\n') {
872 fprintf(stderr, "invalid key (newline): %s\n", key);
873 free(store.key);
874 ret = 1;
875 goto out_free;
876 }
877 store.key[i] = c;
878 }
879 store.key[i] = 0;
880
881 /*
882 * The lock serves a purpose in addition to locking: the new
883 * contents of .git/config will be written into it.
884 */
885 lock = xcalloc(sizeof(struct lock_file), 1);
886 fd = hold_lock_file_for_update(lock, config_filename, 0);
887 if (fd < 0) {
888 fprintf(stderr, "could not lock config file\n");
889 free(store.key);
890 ret = -1;
891 goto out_free;
892 }
893
894 /*
895 * If .git/config does not exist yet, write a minimal version.
896 */
897 in_fd = open(config_filename, O_RDONLY);
898 if ( in_fd < 0 ) {
899 free(store.key);
900
901 if ( ENOENT != errno ) {
902 error("opening %s: %s", config_filename,
903 strerror(errno));
904 ret = 3; /* same as "invalid config file" */
905 goto out_free;
906 }
907 /* if nothing to unset, error out */
908 if (value == NULL) {
909 ret = 5;
910 goto out_free;
911 }
912
913 store.key = (char*)key;
914 if (!store_write_section(fd, key) ||
915 !store_write_pair(fd, key, value))
916 goto write_err_out;
917 } else {
918 struct stat st;
919 char* contents;
920 size_t contents_sz, copy_begin, copy_end;
921 int i, new_line = 0;
922
923 if (value_regex == NULL)
924 store.value_regex = NULL;
925 else {
926 if (value_regex[0] == '!') {
927 store.do_not_match = 1;
928 value_regex++;
929 } else
930 store.do_not_match = 0;
931
932 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
933 if (regcomp(store.value_regex, value_regex,
934 REG_EXTENDED)) {
935 fprintf(stderr, "Invalid pattern: %s\n",
936 value_regex);
937 free(store.value_regex);
938 ret = 6;
939 goto out_free;
940 }
941 }
942
943 store.offset[0] = 0;
944 store.state = START;
945 store.seen = 0;
946
947 /*
948 * After this, store.offset will contain the *end* offset
949 * of the last match, or remain at 0 if no match was found.
950 * As a side effect, we make sure to transform only a valid
951 * existing config file.
952 */
953 if (git_config_from_file(store_aux, config_filename)) {
954 fprintf(stderr, "invalid config file\n");
955 free(store.key);
956 if (store.value_regex != NULL) {
957 regfree(store.value_regex);
958 free(store.value_regex);
959 }
960 ret = 3;
961 goto out_free;
962 }
963
964 free(store.key);
965 if (store.value_regex != NULL) {
966 regfree(store.value_regex);
967 free(store.value_regex);
968 }
969
970 /* if nothing to unset, or too many matches, error out */
971 if ((store.seen == 0 && value == NULL) ||
972 (store.seen > 1 && multi_replace == 0)) {
973 ret = 5;
974 goto out_free;
975 }
976
977 fstat(in_fd, &st);
978 contents_sz = xsize_t(st.st_size);
979 contents = xmmap(NULL, contents_sz, PROT_READ,
980 MAP_PRIVATE, in_fd, 0);
981 close(in_fd);
982
983 if (store.seen == 0)
984 store.seen = 1;
985
986 for (i = 0, copy_begin = 0; i < store.seen; i++) {
987 if (store.offset[i] == 0) {
988 store.offset[i] = copy_end = contents_sz;
989 } else if (store.state != KEY_SEEN) {
990 copy_end = store.offset[i];
991 } else
992 copy_end = find_beginning_of_line(
993 contents, contents_sz,
994 store.offset[i]-2, &new_line);
995
996 if (copy_end > 0 && contents[copy_end-1] != '\n')
997 new_line = 1;
998
999 /* write the first part of the config */
1000 if (copy_end > copy_begin) {
1001 if (write_in_full(fd, contents + copy_begin,
1002 copy_end - copy_begin) <
1003 copy_end - copy_begin)
1004 goto write_err_out;
1005 if (new_line &&
1006 write_in_full(fd, "\n", 1) != 1)
1007 goto write_err_out;
1008 }
1009 copy_begin = store.offset[i];
1010 }
1011
1012 /* write the pair (value == NULL means unset) */
1013 if (value != NULL) {
1014 if (store.state == START) {
1015 if (!store_write_section(fd, key))
1016 goto write_err_out;
1017 }
1018 if (!store_write_pair(fd, key, value))
1019 goto write_err_out;
1020 }
1021
1022 /* write the rest of the config */
1023 if (copy_begin < contents_sz)
1024 if (write_in_full(fd, contents + copy_begin,
1025 contents_sz - copy_begin) <
1026 contents_sz - copy_begin)
1027 goto write_err_out;
1028
1029 munmap(contents, contents_sz);
1030 }
1031
1032 if (commit_lock_file(lock) < 0) {
1033 fprintf(stderr, "Cannot commit config file!\n");
1034 ret = 4;
1035 goto out_free;
1036 }
1037
1038 /*
1039 * lock is committed, so don't try to roll it back below.
1040 * NOTE: Since lockfile.c keeps a linked list of all created
1041 * lock_file structures, it isn't safe to free(lock). It's
1042 * better to just leave it hanging around.
1043 */
1044 lock = NULL;
1045 ret = 0;
1046
1047 out_free:
1048 if (lock)
1049 rollback_lock_file(lock);
1050 free(config_filename);
1051 return ret;
1052
1053 write_err_out:
1054 ret = write_error();
1055 goto out_free;
1056
1057 }
1058
1059 static int section_name_match (const char *buf, const char *name)
1060 {
1061 int i = 0, j = 0, dot = 0;
1062 for (; buf[i] && buf[i] != ']'; i++) {
1063 if (!dot && isspace(buf[i])) {
1064 dot = 1;
1065 if (name[j++] != '.')
1066 break;
1067 for (i++; isspace(buf[i]); i++)
1068 ; /* do nothing */
1069 if (buf[i] != '"')
1070 break;
1071 continue;
1072 }
1073 if (buf[i] == '\\' && dot)
1074 i++;
1075 else if (buf[i] == '"' && dot) {
1076 for (i++; isspace(buf[i]); i++)
1077 ; /* do_nothing */
1078 break;
1079 }
1080 if (buf[i] != name[j++])
1081 break;
1082 }
1083 return (buf[i] == ']' && name[j] == 0);
1084 }
1085
1086 /* if new_name == NULL, the section is removed instead */
1087 int git_config_rename_section(const char *old_name, const char *new_name)
1088 {
1089 int ret = 0, remove = 0;
1090 char *config_filename;
1091 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1092 int out_fd;
1093 char buf[1024];
1094
1095 config_filename = getenv(CONFIG_ENVIRONMENT);
1096 if (!config_filename) {
1097 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
1098 if (!config_filename)
1099 config_filename = git_path("config");
1100 }
1101 config_filename = xstrdup(config_filename);
1102 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1103 if (out_fd < 0) {
1104 ret = error("Could not lock config file!");
1105 goto out;
1106 }
1107
1108 if (!(config_file = fopen(config_filename, "rb"))) {
1109 /* no config file means nothing to rename, no error */
1110 goto unlock_and_out;
1111 }
1112
1113 while (fgets(buf, sizeof(buf), config_file)) {
1114 int i;
1115 int length;
1116 for (i = 0; buf[i] && isspace(buf[i]); i++)
1117 ; /* do nothing */
1118 if (buf[i] == '[') {
1119 /* it's a section */
1120 if (section_name_match (&buf[i+1], old_name)) {
1121 ret++;
1122 if (new_name == NULL) {
1123 remove = 1;
1124 continue;
1125 }
1126 store.baselen = strlen(new_name);
1127 if (!store_write_section(out_fd, new_name)) {
1128 ret = write_error();
1129 goto out;
1130 }
1131 continue;
1132 }
1133 remove = 0;
1134 }
1135 if (remove)
1136 continue;
1137 length = strlen(buf);
1138 if (write_in_full(out_fd, buf, length) != length) {
1139 ret = write_error();
1140 goto out;
1141 }
1142 }
1143 fclose(config_file);
1144 unlock_and_out:
1145 if (commit_lock_file(lock) < 0)
1146 ret = error("Cannot commit config file!");
1147 out:
1148 free(config_filename);
1149 return ret;
1150 }
1151
1152 /*
1153 * Call this to report error for your variable that should not
1154 * get a boolean value (i.e. "[my] var" means "true").
1155 */
1156 int config_error_nonbool(const char *var)
1157 {
1158 return error("Missing value for '%s'", var);
1159 }