67cc1dcad0b52f0186c0c9564af43853d8994797
[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 const char *config_exclusive_filename = NULL;
20
21 static int get_next_char(void)
22 {
23 int c;
24 FILE *f;
25
26 c = '\n';
27 if ((f = config_file) != NULL) {
28 c = fgetc(f);
29 if (c == '\r') {
30 /* DOS like systems */
31 c = fgetc(f);
32 if (c != '\n') {
33 ungetc(c, f);
34 c = '\r';
35 }
36 }
37 if (c == '\n')
38 config_linenr++;
39 if (c == EOF) {
40 config_file_eof = 1;
41 c = '\n';
42 }
43 }
44 return c;
45 }
46
47 static char *parse_value(void)
48 {
49 static char value[1024];
50 int quote = 0, comment = 0, len = 0, space = 0;
51
52 for (;;) {
53 int c = get_next_char();
54 if (len >= sizeof(value))
55 return NULL;
56 if (c == '\n') {
57 if (quote)
58 return NULL;
59 value[len] = 0;
60 return value;
61 }
62 if (comment)
63 continue;
64 if (isspace(c) && !quote) {
65 space = 1;
66 continue;
67 }
68 if (!quote) {
69 if (c == ';' || c == '#') {
70 comment = 1;
71 continue;
72 }
73 }
74 if (space) {
75 if (len)
76 value[len++] = ' ';
77 space = 0;
78 }
79 if (c == '\\') {
80 c = get_next_char();
81 switch (c) {
82 case '\n':
83 continue;
84 case 't':
85 c = '\t';
86 break;
87 case 'b':
88 c = '\b';
89 break;
90 case 'n':
91 c = '\n';
92 break;
93 /* Some characters escape as themselves */
94 case '\\': case '"':
95 break;
96 /* Reject unknown escape sequences */
97 default:
98 return NULL;
99 }
100 value[len++] = c;
101 continue;
102 }
103 if (c == '"') {
104 quote = 1-quote;
105 continue;
106 }
107 value[len++] = c;
108 }
109 }
110
111 static inline int iskeychar(int c)
112 {
113 return isalnum(c) || c == '-';
114 }
115
116 static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
117 {
118 int c;
119 char *value;
120
121 /* Get the full name */
122 for (;;) {
123 c = get_next_char();
124 if (config_file_eof)
125 break;
126 if (!iskeychar(c))
127 break;
128 name[len++] = tolower(c);
129 if (len >= MAXNAME)
130 return -1;
131 }
132 name[len] = 0;
133 while (c == ' ' || c == '\t')
134 c = get_next_char();
135
136 value = NULL;
137 if (c != '\n') {
138 if (c != '=')
139 return -1;
140 value = parse_value();
141 if (!value)
142 return -1;
143 }
144 return fn(name, value, data);
145 }
146
147 static int get_extended_base_var(char *name, int baselen, int c)
148 {
149 do {
150 if (c == '\n')
151 return -1;
152 c = get_next_char();
153 } while (isspace(c));
154
155 /* We require the format to be '[base "extension"]' */
156 if (c != '"')
157 return -1;
158 name[baselen++] = '.';
159
160 for (;;) {
161 int c = get_next_char();
162 if (c == '\n')
163 return -1;
164 if (c == '"')
165 break;
166 if (c == '\\') {
167 c = get_next_char();
168 if (c == '\n')
169 return -1;
170 }
171 name[baselen++] = c;
172 if (baselen > MAXNAME / 2)
173 return -1;
174 }
175
176 /* Final ']' */
177 if (get_next_char() != ']')
178 return -1;
179 return baselen;
180 }
181
182 static int get_base_var(char *name)
183 {
184 int baselen = 0;
185
186 for (;;) {
187 int c = get_next_char();
188 if (config_file_eof)
189 return -1;
190 if (c == ']')
191 return baselen;
192 if (isspace(c))
193 return get_extended_base_var(name, baselen, c);
194 if (!iskeychar(c) && c != '.')
195 return -1;
196 if (baselen > MAXNAME / 2)
197 return -1;
198 name[baselen++] = tolower(c);
199 }
200 }
201
202 static int git_parse_file(config_fn_t fn, void *data)
203 {
204 int comment = 0;
205 int baselen = 0;
206 static char var[MAXNAME];
207
208 /* U+FEFF Byte Order Mark in UTF8 */
209 static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
210 const unsigned char *bomptr = utf8_bom;
211
212 for (;;) {
213 int c = get_next_char();
214 if (bomptr && *bomptr) {
215 /* We are at the file beginning; skip UTF8-encoded BOM
216 * if present. Sane editors won't put this in on their
217 * own, but e.g. Windows Notepad will do it happily. */
218 if ((unsigned char) c == *bomptr) {
219 bomptr++;
220 continue;
221 } else {
222 /* Do not tolerate partial BOM. */
223 if (bomptr != utf8_bom)
224 break;
225 /* No BOM at file beginning. Cool. */
226 bomptr = NULL;
227 }
228 }
229 if (c == '\n') {
230 if (config_file_eof)
231 return 0;
232 comment = 0;
233 continue;
234 }
235 if (comment || isspace(c))
236 continue;
237 if (c == '#' || c == ';') {
238 comment = 1;
239 continue;
240 }
241 if (c == '[') {
242 baselen = get_base_var(var);
243 if (baselen <= 0)
244 break;
245 var[baselen++] = '.';
246 var[baselen] = 0;
247 continue;
248 }
249 if (!isalpha(c))
250 break;
251 var[baselen] = tolower(c);
252 if (get_value(fn, data, var, baselen+1) < 0)
253 break;
254 }
255 die("bad config file line %d in %s", config_linenr, config_file_name);
256 }
257
258 static int parse_unit_factor(const char *end, unsigned long *val)
259 {
260 if (!*end)
261 return 1;
262 else if (!strcasecmp(end, "k")) {
263 *val *= 1024;
264 return 1;
265 }
266 else if (!strcasecmp(end, "m")) {
267 *val *= 1024 * 1024;
268 return 1;
269 }
270 else if (!strcasecmp(end, "g")) {
271 *val *= 1024 * 1024 * 1024;
272 return 1;
273 }
274 return 0;
275 }
276
277 static int git_parse_long(const char *value, long *ret)
278 {
279 if (value && *value) {
280 char *end;
281 long val = strtol(value, &end, 0);
282 unsigned long factor = 1;
283 if (!parse_unit_factor(end, &factor))
284 return 0;
285 *ret = val * factor;
286 return 1;
287 }
288 return 0;
289 }
290
291 int git_parse_ulong(const char *value, unsigned long *ret)
292 {
293 if (value && *value) {
294 char *end;
295 unsigned long val = strtoul(value, &end, 0);
296 if (!parse_unit_factor(end, &val))
297 return 0;
298 *ret = val;
299 return 1;
300 }
301 return 0;
302 }
303
304 static void die_bad_config(const char *name)
305 {
306 if (config_file_name)
307 die("bad config value for '%s' in %s", name, config_file_name);
308 die("bad config value for '%s'", name);
309 }
310
311 int git_config_int(const char *name, const char *value)
312 {
313 long ret = 0;
314 if (!git_parse_long(value, &ret))
315 die_bad_config(name);
316 return ret;
317 }
318
319 unsigned long git_config_ulong(const char *name, const char *value)
320 {
321 unsigned long ret;
322 if (!git_parse_ulong(value, &ret))
323 die_bad_config(name);
324 return ret;
325 }
326
327 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
328 {
329 *is_bool = 1;
330 if (!value)
331 return 1;
332 if (!*value)
333 return 0;
334 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
335 return 1;
336 if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
337 return 0;
338 *is_bool = 0;
339 return git_config_int(name, value);
340 }
341
342 int git_config_bool(const char *name, const char *value)
343 {
344 int discard;
345 return !!git_config_bool_or_int(name, value, &discard);
346 }
347
348 int git_config_string(const char **dest, const char *var, const char *value)
349 {
350 if (!value)
351 return config_error_nonbool(var);
352 *dest = xstrdup(value);
353 return 0;
354 }
355
356 static int git_default_core_config(const char *var, const char *value)
357 {
358 /* This needs a better name */
359 if (!strcmp(var, "core.filemode")) {
360 trust_executable_bit = git_config_bool(var, value);
361 return 0;
362 }
363 if (!strcmp(var, "core.trustctime")) {
364 trust_ctime = git_config_bool(var, value);
365 return 0;
366 }
367
368 if (!strcmp(var, "core.quotepath")) {
369 quote_path_fully = git_config_bool(var, value);
370 return 0;
371 }
372
373 if (!strcmp(var, "core.symlinks")) {
374 has_symlinks = git_config_bool(var, value);
375 return 0;
376 }
377
378 if (!strcmp(var, "core.ignorecase")) {
379 ignore_case = git_config_bool(var, value);
380 return 0;
381 }
382
383 if (!strcmp(var, "core.bare")) {
384 is_bare_repository_cfg = git_config_bool(var, value);
385 return 0;
386 }
387
388 if (!strcmp(var, "core.ignorestat")) {
389 assume_unchanged = git_config_bool(var, value);
390 return 0;
391 }
392
393 if (!strcmp(var, "core.prefersymlinkrefs")) {
394 prefer_symlink_refs = git_config_bool(var, value);
395 return 0;
396 }
397
398 if (!strcmp(var, "core.logallrefupdates")) {
399 log_all_ref_updates = git_config_bool(var, value);
400 return 0;
401 }
402
403 if (!strcmp(var, "core.warnambiguousrefs")) {
404 warn_ambiguous_refs = git_config_bool(var, value);
405 return 0;
406 }
407
408 if (!strcmp(var, "core.loosecompression")) {
409 int level = git_config_int(var, value);
410 if (level == -1)
411 level = Z_DEFAULT_COMPRESSION;
412 else if (level < 0 || level > Z_BEST_COMPRESSION)
413 die("bad zlib compression level %d", level);
414 zlib_compression_level = level;
415 zlib_compression_seen = 1;
416 return 0;
417 }
418
419 if (!strcmp(var, "core.compression")) {
420 int level = git_config_int(var, value);
421 if (level == -1)
422 level = Z_DEFAULT_COMPRESSION;
423 else if (level < 0 || level > Z_BEST_COMPRESSION)
424 die("bad zlib compression level %d", level);
425 core_compression_level = level;
426 core_compression_seen = 1;
427 if (!zlib_compression_seen)
428 zlib_compression_level = level;
429 return 0;
430 }
431
432 if (!strcmp(var, "core.packedgitwindowsize")) {
433 int pgsz_x2 = getpagesize() * 2;
434 packed_git_window_size = git_config_int(var, value);
435
436 /* This value must be multiple of (pagesize * 2) */
437 packed_git_window_size /= pgsz_x2;
438 if (packed_git_window_size < 1)
439 packed_git_window_size = 1;
440 packed_git_window_size *= pgsz_x2;
441 return 0;
442 }
443
444 if (!strcmp(var, "core.packedgitlimit")) {
445 packed_git_limit = git_config_int(var, value);
446 return 0;
447 }
448
449 if (!strcmp(var, "core.deltabasecachelimit")) {
450 delta_base_cache_limit = git_config_int(var, value);
451 return 0;
452 }
453
454 if (!strcmp(var, "core.autocrlf")) {
455 if (value && !strcasecmp(value, "input")) {
456 auto_crlf = -1;
457 return 0;
458 }
459 auto_crlf = git_config_bool(var, value);
460 return 0;
461 }
462
463 if (!strcmp(var, "core.safecrlf")) {
464 if (value && !strcasecmp(value, "warn")) {
465 safe_crlf = SAFE_CRLF_WARN;
466 return 0;
467 }
468 safe_crlf = 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
488 if (!strcmp(var, "core.fsyncobjectfiles")) {
489 fsync_object_files = git_config_bool(var, value);
490 return 0;
491 }
492
493 /* Add other config variables here and to Documentation/config.txt. */
494 return 0;
495 }
496
497 static int git_default_user_config(const char *var, const char *value)
498 {
499 if (!strcmp(var, "user.name")) {
500 if (!value)
501 return config_error_nonbool(var);
502 strlcpy(git_default_name, value, sizeof(git_default_name));
503 if (git_default_email[0])
504 user_ident_explicitly_given = 1;
505 return 0;
506 }
507
508 if (!strcmp(var, "user.email")) {
509 if (!value)
510 return config_error_nonbool(var);
511 strlcpy(git_default_email, value, sizeof(git_default_email));
512 if (git_default_name[0])
513 user_ident_explicitly_given = 1;
514 return 0;
515 }
516
517 /* Add other config variables here and to Documentation/config.txt. */
518 return 0;
519 }
520
521 static int git_default_i18n_config(const char *var, const char *value)
522 {
523 if (!strcmp(var, "i18n.commitencoding"))
524 return git_config_string(&git_commit_encoding, var, value);
525
526 if (!strcmp(var, "i18n.logoutputencoding"))
527 return git_config_string(&git_log_output_encoding, var, value);
528
529 /* Add other config variables here and to Documentation/config.txt. */
530 return 0;
531 }
532
533 static int git_default_branch_config(const char *var, const char *value)
534 {
535 if (!strcmp(var, "branch.autosetupmerge")) {
536 if (value && !strcasecmp(value, "always")) {
537 git_branch_track = BRANCH_TRACK_ALWAYS;
538 return 0;
539 }
540 git_branch_track = git_config_bool(var, value);
541 return 0;
542 }
543 if (!strcmp(var, "branch.autosetuprebase")) {
544 if (!value)
545 return config_error_nonbool(var);
546 else if (!strcmp(value, "never"))
547 autorebase = AUTOREBASE_NEVER;
548 else if (!strcmp(value, "local"))
549 autorebase = AUTOREBASE_LOCAL;
550 else if (!strcmp(value, "remote"))
551 autorebase = AUTOREBASE_REMOTE;
552 else if (!strcmp(value, "always"))
553 autorebase = AUTOREBASE_ALWAYS;
554 else
555 return error("Malformed value for %s", var);
556 return 0;
557 }
558
559 /* Add other config variables here and to Documentation/config.txt. */
560 return 0;
561 }
562
563 int git_default_config(const char *var, const char *value, void *dummy)
564 {
565 if (!prefixcmp(var, "core."))
566 return git_default_core_config(var, value);
567
568 if (!prefixcmp(var, "user."))
569 return git_default_user_config(var, value);
570
571 if (!prefixcmp(var, "i18n."))
572 return git_default_i18n_config(var, value);
573
574 if (!prefixcmp(var, "branch."))
575 return git_default_branch_config(var, value);
576
577 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
578 pager_use_color = git_config_bool(var,value);
579 return 0;
580 }
581
582 /* Add other config variables here and to Documentation/config.txt. */
583 return 0;
584 }
585
586 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
587 {
588 int ret;
589 FILE *f = fopen(filename, "r");
590
591 ret = -1;
592 if (f) {
593 config_file = f;
594 config_file_name = filename;
595 config_linenr = 1;
596 config_file_eof = 0;
597 ret = git_parse_file(fn, data);
598 fclose(f);
599 config_file_name = NULL;
600 }
601 return ret;
602 }
603
604 const char *git_etc_gitconfig(void)
605 {
606 static const char *system_wide;
607 if (!system_wide)
608 system_wide = system_path(ETC_GITCONFIG);
609 return system_wide;
610 }
611
612 static int git_env_bool(const char *k, int def)
613 {
614 const char *v = getenv(k);
615 return v ? git_config_bool(k, v) : def;
616 }
617
618 int git_config_system(void)
619 {
620 return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
621 }
622
623 int git_config_global(void)
624 {
625 return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
626 }
627
628 int git_config(config_fn_t fn, void *data)
629 {
630 int ret = 0;
631 char *repo_config = NULL;
632 const char *home = NULL;
633
634 /* $GIT_CONFIG makes git read _only_ the given config file,
635 * $GIT_CONFIG_LOCAL will make it process it in addition to the
636 * global config file, the same way it would the per-repository
637 * config file otherwise. */
638 if (config_exclusive_filename)
639 return git_config_from_file(fn, config_exclusive_filename, data);
640 if (git_config_system() && !access(git_etc_gitconfig(), R_OK))
641 ret += git_config_from_file(fn, git_etc_gitconfig(),
642 data);
643
644 home = getenv("HOME");
645 if (git_config_global() && home) {
646 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
647 if (!access(user_config, R_OK))
648 ret += git_config_from_file(fn, user_config, data);
649 free(user_config);
650 }
651
652 repo_config = git_pathdup("config");
653 ret += git_config_from_file(fn, repo_config, data);
654 free(repo_config);
655 return ret;
656 }
657
658 /*
659 * Find all the stuff for git_config_set() below.
660 */
661
662 #define MAX_MATCHES 512
663
664 static struct {
665 int baselen;
666 char* key;
667 int do_not_match;
668 regex_t* value_regex;
669 int multi_replace;
670 size_t offset[MAX_MATCHES];
671 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
672 int seen;
673 } store;
674
675 static int matches(const char* key, const char* value)
676 {
677 return !strcmp(key, store.key) &&
678 (store.value_regex == NULL ||
679 (store.do_not_match ^
680 !regexec(store.value_regex, value, 0, NULL, 0)));
681 }
682
683 static int store_aux(const char* key, const char* value, void *cb)
684 {
685 const char *ep;
686 size_t section_len;
687
688 switch (store.state) {
689 case KEY_SEEN:
690 if (matches(key, value)) {
691 if (store.seen == 1 && store.multi_replace == 0) {
692 warning("%s has multiple values", key);
693 } else if (store.seen >= MAX_MATCHES) {
694 error("too many matches for %s", key);
695 return 1;
696 }
697
698 store.offset[store.seen] = ftell(config_file);
699 store.seen++;
700 }
701 break;
702 case SECTION_SEEN:
703 /*
704 * What we are looking for is in store.key (both
705 * section and var), and its section part is baselen
706 * long. We found key (again, both section and var).
707 * We would want to know if this key is in the same
708 * section as what we are looking for. We already
709 * know we are in the same section as what should
710 * hold store.key.
711 */
712 ep = strrchr(key, '.');
713 section_len = ep - key;
714
715 if ((section_len != store.baselen) ||
716 memcmp(key, store.key, section_len+1)) {
717 store.state = SECTION_END_SEEN;
718 break;
719 }
720
721 /*
722 * Do not increment matches: this is no match, but we
723 * just made sure we are in the desired section.
724 */
725 store.offset[store.seen] = ftell(config_file);
726 /* fallthru */
727 case SECTION_END_SEEN:
728 case START:
729 if (matches(key, value)) {
730 store.offset[store.seen] = ftell(config_file);
731 store.state = KEY_SEEN;
732 store.seen++;
733 } else {
734 if (strrchr(key, '.') - key == store.baselen &&
735 !strncmp(key, store.key, store.baselen)) {
736 store.state = SECTION_SEEN;
737 store.offset[store.seen] = ftell(config_file);
738 }
739 }
740 }
741 return 0;
742 }
743
744 static int write_error(const char *filename)
745 {
746 error("failed to write new configuration file %s", filename);
747
748 /* Same error code as "failed to rename". */
749 return 4;
750 }
751
752 static int store_write_section(int fd, const char* key)
753 {
754 const char *dot;
755 int i, success;
756 struct strbuf sb = STRBUF_INIT;
757
758 dot = memchr(key, '.', store.baselen);
759 if (dot) {
760 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
761 for (i = dot - key + 1; i < store.baselen; i++) {
762 if (key[i] == '"' || key[i] == '\\')
763 strbuf_addch(&sb, '\\');
764 strbuf_addch(&sb, key[i]);
765 }
766 strbuf_addstr(&sb, "\"]\n");
767 } else {
768 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
769 }
770
771 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
772 strbuf_release(&sb);
773
774 return success;
775 }
776
777 static int store_write_pair(int fd, const char* key, const char* value)
778 {
779 int i, success;
780 int length = strlen(key + store.baselen + 1);
781 const char *quote = "";
782 struct strbuf sb = STRBUF_INIT;
783
784 /*
785 * Check to see if the value needs to be surrounded with a dq pair.
786 * Note that problematic characters are always backslash-quoted; this
787 * check is about not losing leading or trailing SP and strings that
788 * follow beginning-of-comment characters (i.e. ';' and '#') by the
789 * configuration parser.
790 */
791 if (value[0] == ' ')
792 quote = "\"";
793 for (i = 0; value[i]; i++)
794 if (value[i] == ';' || value[i] == '#')
795 quote = "\"";
796 if (i && value[i - 1] == ' ')
797 quote = "\"";
798
799 strbuf_addf(&sb, "\t%.*s = %s",
800 length, key + store.baselen + 1, quote);
801
802 for (i = 0; value[i]; i++)
803 switch (value[i]) {
804 case '\n':
805 strbuf_addstr(&sb, "\\n");
806 break;
807 case '\t':
808 strbuf_addstr(&sb, "\\t");
809 break;
810 case '"':
811 case '\\':
812 strbuf_addch(&sb, '\\');
813 default:
814 strbuf_addch(&sb, value[i]);
815 break;
816 }
817 strbuf_addf(&sb, "%s\n", quote);
818
819 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
820 strbuf_release(&sb);
821
822 return success;
823 }
824
825 static ssize_t find_beginning_of_line(const char* contents, size_t size,
826 size_t offset_, int* found_bracket)
827 {
828 size_t equal_offset = size, bracket_offset = size;
829 ssize_t offset;
830
831 contline:
832 for (offset = offset_-2; offset > 0
833 && contents[offset] != '\n'; offset--)
834 switch (contents[offset]) {
835 case '=': equal_offset = offset; break;
836 case ']': bracket_offset = offset; break;
837 }
838 if (offset > 0 && contents[offset-1] == '\\') {
839 offset_ = offset;
840 goto contline;
841 }
842 if (bracket_offset < equal_offset) {
843 *found_bracket = 1;
844 offset = bracket_offset+1;
845 } else
846 offset++;
847
848 return offset;
849 }
850
851 int git_config_set(const char* key, const char* value)
852 {
853 return git_config_set_multivar(key, value, NULL, 0);
854 }
855
856 /*
857 * If value==NULL, unset in (remove from) config,
858 * if value_regex!=NULL, disregard key/value pairs where value does not match.
859 * if multi_replace==0, nothing, or only one matching key/value is replaced,
860 * else all matching key/values (regardless how many) are removed,
861 * before the new pair is written.
862 *
863 * Returns 0 on success.
864 *
865 * This function does this:
866 *
867 * - it locks the config file by creating ".git/config.lock"
868 *
869 * - it then parses the config using store_aux() as validator to find
870 * the position on the key/value pair to replace. If it is to be unset,
871 * it must be found exactly once.
872 *
873 * - the config file is mmap()ed and the part before the match (if any) is
874 * written to the lock file, then the changed part and the rest.
875 *
876 * - the config file is removed and the lock file rename()d to it.
877 *
878 */
879 int git_config_set_multivar(const char* key, const char* value,
880 const char* value_regex, int multi_replace)
881 {
882 int i, dot;
883 int fd = -1, in_fd;
884 int ret;
885 char* config_filename;
886 struct lock_file *lock = NULL;
887 const char* last_dot = strrchr(key, '.');
888
889 if (config_exclusive_filename)
890 config_filename = xstrdup(config_exclusive_filename);
891 else
892 config_filename = git_pathdup("config");
893
894 /*
895 * Since "key" actually contains the section name and the real
896 * key name separated by a dot, we have to know where the dot is.
897 */
898
899 if (last_dot == NULL) {
900 error("key does not contain a section: %s", key);
901 ret = 2;
902 goto out_free;
903 }
904 store.baselen = last_dot - key;
905
906 store.multi_replace = multi_replace;
907
908 /*
909 * Validate the key and while at it, lower case it for matching.
910 */
911 store.key = xmalloc(strlen(key) + 1);
912 dot = 0;
913 for (i = 0; key[i]; i++) {
914 unsigned char c = key[i];
915 if (c == '.')
916 dot = 1;
917 /* Leave the extended basename untouched.. */
918 if (!dot || i > store.baselen) {
919 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
920 error("invalid key: %s", key);
921 free(store.key);
922 ret = 1;
923 goto out_free;
924 }
925 c = tolower(c);
926 } else if (c == '\n') {
927 error("invalid key (newline): %s", key);
928 free(store.key);
929 ret = 1;
930 goto out_free;
931 }
932 store.key[i] = c;
933 }
934 store.key[i] = 0;
935
936 /*
937 * The lock serves a purpose in addition to locking: the new
938 * contents of .git/config will be written into it.
939 */
940 lock = xcalloc(sizeof(struct lock_file), 1);
941 fd = hold_lock_file_for_update(lock, config_filename, 0);
942 if (fd < 0) {
943 error("could not lock config file %s", config_filename);
944 free(store.key);
945 ret = -1;
946 goto out_free;
947 }
948
949 /*
950 * If .git/config does not exist yet, write a minimal version.
951 */
952 in_fd = open(config_filename, O_RDONLY);
953 if ( in_fd < 0 ) {
954 free(store.key);
955
956 if ( ENOENT != errno ) {
957 error("opening %s: %s", config_filename,
958 strerror(errno));
959 ret = 3; /* same as "invalid config file" */
960 goto out_free;
961 }
962 /* if nothing to unset, error out */
963 if (value == NULL) {
964 ret = 5;
965 goto out_free;
966 }
967
968 store.key = (char*)key;
969 if (!store_write_section(fd, key) ||
970 !store_write_pair(fd, key, value))
971 goto write_err_out;
972 } else {
973 struct stat st;
974 char* contents;
975 size_t contents_sz, copy_begin, copy_end;
976 int i, new_line = 0;
977
978 if (value_regex == NULL)
979 store.value_regex = NULL;
980 else {
981 if (value_regex[0] == '!') {
982 store.do_not_match = 1;
983 value_regex++;
984 } else
985 store.do_not_match = 0;
986
987 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
988 if (regcomp(store.value_regex, value_regex,
989 REG_EXTENDED)) {
990 error("invalid pattern: %s", value_regex);
991 free(store.value_regex);
992 ret = 6;
993 goto out_free;
994 }
995 }
996
997 store.offset[0] = 0;
998 store.state = START;
999 store.seen = 0;
1000
1001 /*
1002 * After this, store.offset will contain the *end* offset
1003 * of the last match, or remain at 0 if no match was found.
1004 * As a side effect, we make sure to transform only a valid
1005 * existing config file.
1006 */
1007 if (git_config_from_file(store_aux, config_filename, NULL)) {
1008 error("invalid config file %s", config_filename);
1009 free(store.key);
1010 if (store.value_regex != NULL) {
1011 regfree(store.value_regex);
1012 free(store.value_regex);
1013 }
1014 ret = 3;
1015 goto out_free;
1016 }
1017
1018 free(store.key);
1019 if (store.value_regex != NULL) {
1020 regfree(store.value_regex);
1021 free(store.value_regex);
1022 }
1023
1024 /* if nothing to unset, or too many matches, error out */
1025 if ((store.seen == 0 && value == NULL) ||
1026 (store.seen > 1 && multi_replace == 0)) {
1027 ret = 5;
1028 goto out_free;
1029 }
1030
1031 fstat(in_fd, &st);
1032 contents_sz = xsize_t(st.st_size);
1033 contents = xmmap(NULL, contents_sz, PROT_READ,
1034 MAP_PRIVATE, in_fd, 0);
1035 close(in_fd);
1036
1037 if (store.seen == 0)
1038 store.seen = 1;
1039
1040 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1041 if (store.offset[i] == 0) {
1042 store.offset[i] = copy_end = contents_sz;
1043 } else if (store.state != KEY_SEEN) {
1044 copy_end = store.offset[i];
1045 } else
1046 copy_end = find_beginning_of_line(
1047 contents, contents_sz,
1048 store.offset[i]-2, &new_line);
1049
1050 if (copy_end > 0 && contents[copy_end-1] != '\n')
1051 new_line = 1;
1052
1053 /* write the first part of the config */
1054 if (copy_end > copy_begin) {
1055 if (write_in_full(fd, contents + copy_begin,
1056 copy_end - copy_begin) <
1057 copy_end - copy_begin)
1058 goto write_err_out;
1059 if (new_line &&
1060 write_in_full(fd, "\n", 1) != 1)
1061 goto write_err_out;
1062 }
1063 copy_begin = store.offset[i];
1064 }
1065
1066 /* write the pair (value == NULL means unset) */
1067 if (value != NULL) {
1068 if (store.state == START) {
1069 if (!store_write_section(fd, key))
1070 goto write_err_out;
1071 }
1072 if (!store_write_pair(fd, key, value))
1073 goto write_err_out;
1074 }
1075
1076 /* write the rest of the config */
1077 if (copy_begin < contents_sz)
1078 if (write_in_full(fd, contents + copy_begin,
1079 contents_sz - copy_begin) <
1080 contents_sz - copy_begin)
1081 goto write_err_out;
1082
1083 munmap(contents, contents_sz);
1084 }
1085
1086 if (commit_lock_file(lock) < 0) {
1087 error("could not commit config file %s", config_filename);
1088 ret = 4;
1089 goto out_free;
1090 }
1091
1092 /*
1093 * lock is committed, so don't try to roll it back below.
1094 * NOTE: Since lockfile.c keeps a linked list of all created
1095 * lock_file structures, it isn't safe to free(lock). It's
1096 * better to just leave it hanging around.
1097 */
1098 lock = NULL;
1099 ret = 0;
1100
1101 out_free:
1102 if (lock)
1103 rollback_lock_file(lock);
1104 free(config_filename);
1105 return ret;
1106
1107 write_err_out:
1108 ret = write_error(lock->filename);
1109 goto out_free;
1110
1111 }
1112
1113 static int section_name_match (const char *buf, const char *name)
1114 {
1115 int i = 0, j = 0, dot = 0;
1116 for (; buf[i] && buf[i] != ']'; i++) {
1117 if (!dot && isspace(buf[i])) {
1118 dot = 1;
1119 if (name[j++] != '.')
1120 break;
1121 for (i++; isspace(buf[i]); i++)
1122 ; /* do nothing */
1123 if (buf[i] != '"')
1124 break;
1125 continue;
1126 }
1127 if (buf[i] == '\\' && dot)
1128 i++;
1129 else if (buf[i] == '"' && dot) {
1130 for (i++; isspace(buf[i]); i++)
1131 ; /* do_nothing */
1132 break;
1133 }
1134 if (buf[i] != name[j++])
1135 break;
1136 }
1137 return (buf[i] == ']' && name[j] == 0);
1138 }
1139
1140 /* if new_name == NULL, the section is removed instead */
1141 int git_config_rename_section(const char *old_name, const char *new_name)
1142 {
1143 int ret = 0, remove = 0;
1144 char *config_filename;
1145 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1146 int out_fd;
1147 char buf[1024];
1148
1149 if (config_exclusive_filename)
1150 config_filename = xstrdup(config_exclusive_filename);
1151 else
1152 config_filename = git_pathdup("config");
1153 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1154 if (out_fd < 0) {
1155 ret = error("could not lock config file %s", config_filename);
1156 goto out;
1157 }
1158
1159 if (!(config_file = fopen(config_filename, "rb"))) {
1160 /* no config file means nothing to rename, no error */
1161 goto unlock_and_out;
1162 }
1163
1164 while (fgets(buf, sizeof(buf), config_file)) {
1165 int i;
1166 int length;
1167 for (i = 0; buf[i] && isspace(buf[i]); i++)
1168 ; /* do nothing */
1169 if (buf[i] == '[') {
1170 /* it's a section */
1171 if (section_name_match (&buf[i+1], old_name)) {
1172 ret++;
1173 if (new_name == NULL) {
1174 remove = 1;
1175 continue;
1176 }
1177 store.baselen = strlen(new_name);
1178 if (!store_write_section(out_fd, new_name)) {
1179 ret = write_error(lock->filename);
1180 goto out;
1181 }
1182 continue;
1183 }
1184 remove = 0;
1185 }
1186 if (remove)
1187 continue;
1188 length = strlen(buf);
1189 if (write_in_full(out_fd, buf, length) != length) {
1190 ret = write_error(lock->filename);
1191 goto out;
1192 }
1193 }
1194 fclose(config_file);
1195 unlock_and_out:
1196 if (commit_lock_file(lock) < 0)
1197 ret = error("could not commit config file %s", config_filename);
1198 out:
1199 free(config_filename);
1200 return ret;
1201 }
1202
1203 /*
1204 * Call this to report error for your variable that should not
1205 * get a boolean value (i.e. "[my] var" means "true").
1206 */
1207 int config_error_nonbool(const char *var)
1208 {
1209 return error("Missing value for '%s'", var);
1210 }