Merge branch 'nd/sparse'
[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) - 1)
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 if (len)
66 space++;
67 continue;
68 }
69 if (!quote) {
70 if (c == ';' || c == '#') {
71 comment = 1;
72 continue;
73 }
74 }
75 for (; space; space--)
76 value[len++] = ' ';
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, void *data, 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, data);
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, void *data)
201 {
202 int comment = 0;
203 int baselen = 0;
204 static char var[MAXNAME];
205
206 /* U+FEFF Byte Order Mark in UTF8 */
207 static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
208 const unsigned char *bomptr = utf8_bom;
209
210 for (;;) {
211 int c = get_next_char();
212 if (bomptr && *bomptr) {
213 /* We are at the file beginning; skip UTF8-encoded BOM
214 * if present. Sane editors won't put this in on their
215 * own, but e.g. Windows Notepad will do it happily. */
216 if ((unsigned char) c == *bomptr) {
217 bomptr++;
218 continue;
219 } else {
220 /* Do not tolerate partial BOM. */
221 if (bomptr != utf8_bom)
222 break;
223 /* No BOM at file beginning. Cool. */
224 bomptr = NULL;
225 }
226 }
227 if (c == '\n') {
228 if (config_file_eof)
229 return 0;
230 comment = 0;
231 continue;
232 }
233 if (comment || isspace(c))
234 continue;
235 if (c == '#' || c == ';') {
236 comment = 1;
237 continue;
238 }
239 if (c == '[') {
240 baselen = get_base_var(var);
241 if (baselen <= 0)
242 break;
243 var[baselen++] = '.';
244 var[baselen] = 0;
245 continue;
246 }
247 if (!isalpha(c))
248 break;
249 var[baselen] = tolower(c);
250 if (get_value(fn, data, var, baselen+1) < 0)
251 break;
252 }
253 die("bad config file line %d in %s", config_linenr, config_file_name);
254 }
255
256 static int parse_unit_factor(const char *end, unsigned long *val)
257 {
258 if (!*end)
259 return 1;
260 else if (!strcasecmp(end, "k")) {
261 *val *= 1024;
262 return 1;
263 }
264 else if (!strcasecmp(end, "m")) {
265 *val *= 1024 * 1024;
266 return 1;
267 }
268 else if (!strcasecmp(end, "g")) {
269 *val *= 1024 * 1024 * 1024;
270 return 1;
271 }
272 return 0;
273 }
274
275 static int git_parse_long(const char *value, long *ret)
276 {
277 if (value && *value) {
278 char *end;
279 long val = strtol(value, &end, 0);
280 unsigned long factor = 1;
281 if (!parse_unit_factor(end, &factor))
282 return 0;
283 *ret = val * factor;
284 return 1;
285 }
286 return 0;
287 }
288
289 int git_parse_ulong(const char *value, unsigned long *ret)
290 {
291 if (value && *value) {
292 char *end;
293 unsigned long val = strtoul(value, &end, 0);
294 if (!parse_unit_factor(end, &val))
295 return 0;
296 *ret = val;
297 return 1;
298 }
299 return 0;
300 }
301
302 static void die_bad_config(const char *name)
303 {
304 if (config_file_name)
305 die("bad config value for '%s' in %s", name, config_file_name);
306 die("bad config value for '%s'", name);
307 }
308
309 int git_config_int(const char *name, const char *value)
310 {
311 long ret = 0;
312 if (!git_parse_long(value, &ret))
313 die_bad_config(name);
314 return ret;
315 }
316
317 unsigned long git_config_ulong(const char *name, const char *value)
318 {
319 unsigned long ret;
320 if (!git_parse_ulong(value, &ret))
321 die_bad_config(name);
322 return ret;
323 }
324
325 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
326 {
327 *is_bool = 1;
328 if (!value)
329 return 1;
330 if (!*value)
331 return 0;
332 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on"))
333 return 1;
334 if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off"))
335 return 0;
336 *is_bool = 0;
337 return git_config_int(name, value);
338 }
339
340 int git_config_bool(const char *name, const char *value)
341 {
342 int discard;
343 return !!git_config_bool_or_int(name, value, &discard);
344 }
345
346 int git_config_string(const char **dest, const char *var, const char *value)
347 {
348 if (!value)
349 return config_error_nonbool(var);
350 *dest = xstrdup(value);
351 return 0;
352 }
353
354 int git_config_pathname(const char **dest, const char *var, const char *value)
355 {
356 if (!value)
357 return config_error_nonbool(var);
358 *dest = expand_user_path(value);
359 if (!*dest)
360 die("Failed to expand user dir in: '%s'", value);
361 return 0;
362 }
363
364 static int git_default_core_config(const char *var, const char *value)
365 {
366 /* This needs a better name */
367 if (!strcmp(var, "core.filemode")) {
368 trust_executable_bit = git_config_bool(var, value);
369 return 0;
370 }
371 if (!strcmp(var, "core.trustctime")) {
372 trust_ctime = git_config_bool(var, value);
373 return 0;
374 }
375
376 if (!strcmp(var, "core.quotepath")) {
377 quote_path_fully = git_config_bool(var, value);
378 return 0;
379 }
380
381 if (!strcmp(var, "core.symlinks")) {
382 has_symlinks = git_config_bool(var, value);
383 return 0;
384 }
385
386 if (!strcmp(var, "core.ignorecase")) {
387 ignore_case = git_config_bool(var, value);
388 return 0;
389 }
390
391 if (!strcmp(var, "core.bare")) {
392 is_bare_repository_cfg = git_config_bool(var, value);
393 return 0;
394 }
395
396 if (!strcmp(var, "core.ignorestat")) {
397 assume_unchanged = git_config_bool(var, value);
398 return 0;
399 }
400
401 if (!strcmp(var, "core.prefersymlinkrefs")) {
402 prefer_symlink_refs = git_config_bool(var, value);
403 return 0;
404 }
405
406 if (!strcmp(var, "core.logallrefupdates")) {
407 log_all_ref_updates = git_config_bool(var, value);
408 return 0;
409 }
410
411 if (!strcmp(var, "core.warnambiguousrefs")) {
412 warn_ambiguous_refs = git_config_bool(var, value);
413 return 0;
414 }
415
416 if (!strcmp(var, "core.loosecompression")) {
417 int level = git_config_int(var, value);
418 if (level == -1)
419 level = Z_DEFAULT_COMPRESSION;
420 else if (level < 0 || level > Z_BEST_COMPRESSION)
421 die("bad zlib compression level %d", level);
422 zlib_compression_level = level;
423 zlib_compression_seen = 1;
424 return 0;
425 }
426
427 if (!strcmp(var, "core.compression")) {
428 int level = git_config_int(var, value);
429 if (level == -1)
430 level = Z_DEFAULT_COMPRESSION;
431 else if (level < 0 || level > Z_BEST_COMPRESSION)
432 die("bad zlib compression level %d", level);
433 core_compression_level = level;
434 core_compression_seen = 1;
435 if (!zlib_compression_seen)
436 zlib_compression_level = level;
437 return 0;
438 }
439
440 if (!strcmp(var, "core.packedgitwindowsize")) {
441 int pgsz_x2 = getpagesize() * 2;
442 packed_git_window_size = git_config_int(var, value);
443
444 /* This value must be multiple of (pagesize * 2) */
445 packed_git_window_size /= pgsz_x2;
446 if (packed_git_window_size < 1)
447 packed_git_window_size = 1;
448 packed_git_window_size *= pgsz_x2;
449 return 0;
450 }
451
452 if (!strcmp(var, "core.packedgitlimit")) {
453 packed_git_limit = git_config_int(var, value);
454 return 0;
455 }
456
457 if (!strcmp(var, "core.deltabasecachelimit")) {
458 delta_base_cache_limit = git_config_int(var, value);
459 return 0;
460 }
461
462 if (!strcmp(var, "core.autocrlf")) {
463 if (value && !strcasecmp(value, "input")) {
464 auto_crlf = -1;
465 return 0;
466 }
467 auto_crlf = git_config_bool(var, value);
468 return 0;
469 }
470
471 if (!strcmp(var, "core.safecrlf")) {
472 if (value && !strcasecmp(value, "warn")) {
473 safe_crlf = SAFE_CRLF_WARN;
474 return 0;
475 }
476 safe_crlf = git_config_bool(var, value);
477 return 0;
478 }
479
480 if (!strcmp(var, "core.notesref")) {
481 notes_ref_name = xstrdup(value);
482 return 0;
483 }
484
485 if (!strcmp(var, "core.pager"))
486 return git_config_string(&pager_program, var, value);
487
488 if (!strcmp(var, "core.editor"))
489 return git_config_string(&editor_program, var, value);
490
491 if (!strcmp(var, "core.excludesfile"))
492 return git_config_pathname(&excludes_file, var, value);
493
494 if (!strcmp(var, "core.whitespace")) {
495 if (!value)
496 return config_error_nonbool(var);
497 whitespace_rule_cfg = parse_whitespace_rule(value);
498 return 0;
499 }
500
501 if (!strcmp(var, "core.fsyncobjectfiles")) {
502 fsync_object_files = git_config_bool(var, value);
503 return 0;
504 }
505
506 if (!strcmp(var, "core.preloadindex")) {
507 core_preload_index = git_config_bool(var, value);
508 return 0;
509 }
510
511 if (!strcmp(var, "core.createobject")) {
512 if (!strcmp(value, "rename"))
513 object_creation_mode = OBJECT_CREATION_USES_RENAMES;
514 else if (!strcmp(value, "link"))
515 object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
516 else
517 die("Invalid mode for object creation: %s", value);
518 return 0;
519 }
520
521 if (!strcmp(var, "core.sparsecheckout")) {
522 core_apply_sparse_checkout = git_config_bool(var, value);
523 return 0;
524 }
525
526 /* Add other config variables here and to Documentation/config.txt. */
527 return 0;
528 }
529
530 static int git_default_user_config(const char *var, const char *value)
531 {
532 if (!strcmp(var, "user.name")) {
533 if (!value)
534 return config_error_nonbool(var);
535 strlcpy(git_default_name, value, sizeof(git_default_name));
536 if (git_default_email[0])
537 user_ident_explicitly_given = 1;
538 return 0;
539 }
540
541 if (!strcmp(var, "user.email")) {
542 if (!value)
543 return config_error_nonbool(var);
544 strlcpy(git_default_email, value, sizeof(git_default_email));
545 if (git_default_name[0])
546 user_ident_explicitly_given = 1;
547 return 0;
548 }
549
550 /* Add other config variables here and to Documentation/config.txt. */
551 return 0;
552 }
553
554 static int git_default_i18n_config(const char *var, const char *value)
555 {
556 if (!strcmp(var, "i18n.commitencoding"))
557 return git_config_string(&git_commit_encoding, var, value);
558
559 if (!strcmp(var, "i18n.logoutputencoding"))
560 return git_config_string(&git_log_output_encoding, var, value);
561
562 /* Add other config variables here and to Documentation/config.txt. */
563 return 0;
564 }
565
566 static int git_default_branch_config(const char *var, const char *value)
567 {
568 if (!strcmp(var, "branch.autosetupmerge")) {
569 if (value && !strcasecmp(value, "always")) {
570 git_branch_track = BRANCH_TRACK_ALWAYS;
571 return 0;
572 }
573 git_branch_track = git_config_bool(var, value);
574 return 0;
575 }
576 if (!strcmp(var, "branch.autosetuprebase")) {
577 if (!value)
578 return config_error_nonbool(var);
579 else if (!strcmp(value, "never"))
580 autorebase = AUTOREBASE_NEVER;
581 else if (!strcmp(value, "local"))
582 autorebase = AUTOREBASE_LOCAL;
583 else if (!strcmp(value, "remote"))
584 autorebase = AUTOREBASE_REMOTE;
585 else if (!strcmp(value, "always"))
586 autorebase = AUTOREBASE_ALWAYS;
587 else
588 return error("Malformed value for %s", var);
589 return 0;
590 }
591
592 /* Add other config variables here and to Documentation/config.txt. */
593 return 0;
594 }
595
596 static int git_default_push_config(const char *var, const char *value)
597 {
598 if (!strcmp(var, "push.default")) {
599 if (!value)
600 return config_error_nonbool(var);
601 else if (!strcmp(value, "nothing"))
602 push_default = PUSH_DEFAULT_NOTHING;
603 else if (!strcmp(value, "matching"))
604 push_default = PUSH_DEFAULT_MATCHING;
605 else if (!strcmp(value, "tracking"))
606 push_default = PUSH_DEFAULT_TRACKING;
607 else if (!strcmp(value, "current"))
608 push_default = PUSH_DEFAULT_CURRENT;
609 else {
610 error("Malformed value for %s: %s", var, value);
611 return error("Must be one of nothing, matching, "
612 "tracking or current.");
613 }
614 return 0;
615 }
616
617 /* Add other config variables here and to Documentation/config.txt. */
618 return 0;
619 }
620
621 static int git_default_mailmap_config(const char *var, const char *value)
622 {
623 if (!strcmp(var, "mailmap.file"))
624 return git_config_string(&git_mailmap_file, var, value);
625
626 /* Add other config variables here and to Documentation/config.txt. */
627 return 0;
628 }
629
630 int git_default_config(const char *var, const char *value, void *dummy)
631 {
632 if (!prefixcmp(var, "core."))
633 return git_default_core_config(var, value);
634
635 if (!prefixcmp(var, "user."))
636 return git_default_user_config(var, value);
637
638 if (!prefixcmp(var, "i18n."))
639 return git_default_i18n_config(var, value);
640
641 if (!prefixcmp(var, "branch."))
642 return git_default_branch_config(var, value);
643
644 if (!prefixcmp(var, "push."))
645 return git_default_push_config(var, value);
646
647 if (!prefixcmp(var, "mailmap."))
648 return git_default_mailmap_config(var, value);
649
650 if (!prefixcmp(var, "advice."))
651 return git_default_advice_config(var, value);
652
653 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
654 pager_use_color = git_config_bool(var,value);
655 return 0;
656 }
657
658 /* Add other config variables here and to Documentation/config.txt. */
659 return 0;
660 }
661
662 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
663 {
664 int ret;
665 FILE *f = fopen(filename, "r");
666
667 ret = -1;
668 if (f) {
669 config_file = f;
670 config_file_name = filename;
671 config_linenr = 1;
672 config_file_eof = 0;
673 ret = git_parse_file(fn, data);
674 fclose(f);
675 config_file_name = NULL;
676 }
677 return ret;
678 }
679
680 const char *git_etc_gitconfig(void)
681 {
682 static const char *system_wide;
683 if (!system_wide)
684 system_wide = system_path(ETC_GITCONFIG);
685 return system_wide;
686 }
687
688 static int git_env_bool(const char *k, int def)
689 {
690 const char *v = getenv(k);
691 return v ? git_config_bool(k, v) : def;
692 }
693
694 int git_config_system(void)
695 {
696 return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
697 }
698
699 int git_config_global(void)
700 {
701 return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
702 }
703
704 int git_config(config_fn_t fn, void *data)
705 {
706 int ret = 0, found = 0;
707 char *repo_config = NULL;
708 const char *home = NULL;
709
710 /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
711 if (config_exclusive_filename)
712 return git_config_from_file(fn, config_exclusive_filename, data);
713 if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
714 ret += git_config_from_file(fn, git_etc_gitconfig(),
715 data);
716 found += 1;
717 }
718
719 home = getenv("HOME");
720 if (git_config_global() && home) {
721 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
722 if (!access(user_config, R_OK)) {
723 ret += git_config_from_file(fn, user_config, data);
724 found += 1;
725 }
726 free(user_config);
727 }
728
729 repo_config = git_pathdup("config");
730 if (!access(repo_config, R_OK)) {
731 ret += git_config_from_file(fn, repo_config, data);
732 found += 1;
733 }
734 free(repo_config);
735 if (found == 0)
736 return -1;
737 return ret;
738 }
739
740 /*
741 * Find all the stuff for git_config_set() below.
742 */
743
744 #define MAX_MATCHES 512
745
746 static struct {
747 int baselen;
748 char *key;
749 int do_not_match;
750 regex_t *value_regex;
751 int multi_replace;
752 size_t offset[MAX_MATCHES];
753 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
754 int seen;
755 } store;
756
757 static int matches(const char *key, const char *value)
758 {
759 return !strcmp(key, store.key) &&
760 (store.value_regex == NULL ||
761 (store.do_not_match ^
762 !regexec(store.value_regex, value, 0, NULL, 0)));
763 }
764
765 static int store_aux(const char *key, const char *value, void *cb)
766 {
767 const char *ep;
768 size_t section_len;
769
770 switch (store.state) {
771 case KEY_SEEN:
772 if (matches(key, value)) {
773 if (store.seen == 1 && store.multi_replace == 0) {
774 warning("%s has multiple values", key);
775 } else if (store.seen >= MAX_MATCHES) {
776 error("too many matches for %s", key);
777 return 1;
778 }
779
780 store.offset[store.seen] = ftell(config_file);
781 store.seen++;
782 }
783 break;
784 case SECTION_SEEN:
785 /*
786 * What we are looking for is in store.key (both
787 * section and var), and its section part is baselen
788 * long. We found key (again, both section and var).
789 * We would want to know if this key is in the same
790 * section as what we are looking for. We already
791 * know we are in the same section as what should
792 * hold store.key.
793 */
794 ep = strrchr(key, '.');
795 section_len = ep - key;
796
797 if ((section_len != store.baselen) ||
798 memcmp(key, store.key, section_len+1)) {
799 store.state = SECTION_END_SEEN;
800 break;
801 }
802
803 /*
804 * Do not increment matches: this is no match, but we
805 * just made sure we are in the desired section.
806 */
807 store.offset[store.seen] = ftell(config_file);
808 /* fallthru */
809 case SECTION_END_SEEN:
810 case START:
811 if (matches(key, value)) {
812 store.offset[store.seen] = ftell(config_file);
813 store.state = KEY_SEEN;
814 store.seen++;
815 } else {
816 if (strrchr(key, '.') - key == store.baselen &&
817 !strncmp(key, store.key, store.baselen)) {
818 store.state = SECTION_SEEN;
819 store.offset[store.seen] = ftell(config_file);
820 }
821 }
822 }
823 return 0;
824 }
825
826 static int write_error(const char *filename)
827 {
828 error("failed to write new configuration file %s", filename);
829
830 /* Same error code as "failed to rename". */
831 return 4;
832 }
833
834 static int store_write_section(int fd, const char *key)
835 {
836 const char *dot;
837 int i, success;
838 struct strbuf sb = STRBUF_INIT;
839
840 dot = memchr(key, '.', store.baselen);
841 if (dot) {
842 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
843 for (i = dot - key + 1; i < store.baselen; i++) {
844 if (key[i] == '"' || key[i] == '\\')
845 strbuf_addch(&sb, '\\');
846 strbuf_addch(&sb, key[i]);
847 }
848 strbuf_addstr(&sb, "\"]\n");
849 } else {
850 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
851 }
852
853 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
854 strbuf_release(&sb);
855
856 return success;
857 }
858
859 static int store_write_pair(int fd, const char *key, const char *value)
860 {
861 int i, success;
862 int length = strlen(key + store.baselen + 1);
863 const char *quote = "";
864 struct strbuf sb = STRBUF_INIT;
865
866 /*
867 * Check to see if the value needs to be surrounded with a dq pair.
868 * Note that problematic characters are always backslash-quoted; this
869 * check is about not losing leading or trailing SP and strings that
870 * follow beginning-of-comment characters (i.e. ';' and '#') by the
871 * configuration parser.
872 */
873 if (value[0] == ' ')
874 quote = "\"";
875 for (i = 0; value[i]; i++)
876 if (value[i] == ';' || value[i] == '#')
877 quote = "\"";
878 if (i && value[i - 1] == ' ')
879 quote = "\"";
880
881 strbuf_addf(&sb, "\t%.*s = %s",
882 length, key + store.baselen + 1, quote);
883
884 for (i = 0; value[i]; i++)
885 switch (value[i]) {
886 case '\n':
887 strbuf_addstr(&sb, "\\n");
888 break;
889 case '\t':
890 strbuf_addstr(&sb, "\\t");
891 break;
892 case '"':
893 case '\\':
894 strbuf_addch(&sb, '\\');
895 default:
896 strbuf_addch(&sb, value[i]);
897 break;
898 }
899 strbuf_addf(&sb, "%s\n", quote);
900
901 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
902 strbuf_release(&sb);
903
904 return success;
905 }
906
907 static ssize_t find_beginning_of_line(const char *contents, size_t size,
908 size_t offset_, int *found_bracket)
909 {
910 size_t equal_offset = size, bracket_offset = size;
911 ssize_t offset;
912
913 contline:
914 for (offset = offset_-2; offset > 0
915 && contents[offset] != '\n'; offset--)
916 switch (contents[offset]) {
917 case '=': equal_offset = offset; break;
918 case ']': bracket_offset = offset; break;
919 }
920 if (offset > 0 && contents[offset-1] == '\\') {
921 offset_ = offset;
922 goto contline;
923 }
924 if (bracket_offset < equal_offset) {
925 *found_bracket = 1;
926 offset = bracket_offset+1;
927 } else
928 offset++;
929
930 return offset;
931 }
932
933 int git_config_set(const char *key, const char *value)
934 {
935 return git_config_set_multivar(key, value, NULL, 0);
936 }
937
938 /*
939 * If value==NULL, unset in (remove from) config,
940 * if value_regex!=NULL, disregard key/value pairs where value does not match.
941 * if multi_replace==0, nothing, or only one matching key/value is replaced,
942 * else all matching key/values (regardless how many) are removed,
943 * before the new pair is written.
944 *
945 * Returns 0 on success.
946 *
947 * This function does this:
948 *
949 * - it locks the config file by creating ".git/config.lock"
950 *
951 * - it then parses the config using store_aux() as validator to find
952 * the position on the key/value pair to replace. If it is to be unset,
953 * it must be found exactly once.
954 *
955 * - the config file is mmap()ed and the part before the match (if any) is
956 * written to the lock file, then the changed part and the rest.
957 *
958 * - the config file is removed and the lock file rename()d to it.
959 *
960 */
961 int git_config_set_multivar(const char *key, const char *value,
962 const char *value_regex, int multi_replace)
963 {
964 int i, dot;
965 int fd = -1, in_fd;
966 int ret;
967 char *config_filename;
968 struct lock_file *lock = NULL;
969 const char *last_dot = strrchr(key, '.');
970
971 if (config_exclusive_filename)
972 config_filename = xstrdup(config_exclusive_filename);
973 else
974 config_filename = git_pathdup("config");
975
976 /*
977 * Since "key" actually contains the section name and the real
978 * key name separated by a dot, we have to know where the dot is.
979 */
980
981 if (last_dot == NULL) {
982 error("key does not contain a section: %s", key);
983 ret = 2;
984 goto out_free;
985 }
986 store.baselen = last_dot - key;
987
988 store.multi_replace = multi_replace;
989
990 /*
991 * Validate the key and while at it, lower case it for matching.
992 */
993 store.key = xmalloc(strlen(key) + 1);
994 dot = 0;
995 for (i = 0; key[i]; i++) {
996 unsigned char c = key[i];
997 if (c == '.')
998 dot = 1;
999 /* Leave the extended basename untouched.. */
1000 if (!dot || i > store.baselen) {
1001 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1002 error("invalid key: %s", key);
1003 free(store.key);
1004 ret = 1;
1005 goto out_free;
1006 }
1007 c = tolower(c);
1008 } else if (c == '\n') {
1009 error("invalid key (newline): %s", key);
1010 free(store.key);
1011 ret = 1;
1012 goto out_free;
1013 }
1014 store.key[i] = c;
1015 }
1016 store.key[i] = 0;
1017
1018 /*
1019 * The lock serves a purpose in addition to locking: the new
1020 * contents of .git/config will be written into it.
1021 */
1022 lock = xcalloc(sizeof(struct lock_file), 1);
1023 fd = hold_lock_file_for_update(lock, config_filename, 0);
1024 if (fd < 0) {
1025 error("could not lock config file %s: %s", config_filename, strerror(errno));
1026 free(store.key);
1027 ret = -1;
1028 goto out_free;
1029 }
1030
1031 /*
1032 * If .git/config does not exist yet, write a minimal version.
1033 */
1034 in_fd = open(config_filename, O_RDONLY);
1035 if ( in_fd < 0 ) {
1036 free(store.key);
1037
1038 if ( ENOENT != errno ) {
1039 error("opening %s: %s", config_filename,
1040 strerror(errno));
1041 ret = 3; /* same as "invalid config file" */
1042 goto out_free;
1043 }
1044 /* if nothing to unset, error out */
1045 if (value == NULL) {
1046 ret = 5;
1047 goto out_free;
1048 }
1049
1050 store.key = (char *)key;
1051 if (!store_write_section(fd, key) ||
1052 !store_write_pair(fd, key, value))
1053 goto write_err_out;
1054 } else {
1055 struct stat st;
1056 char *contents;
1057 size_t contents_sz, copy_begin, copy_end;
1058 int i, new_line = 0;
1059
1060 if (value_regex == NULL)
1061 store.value_regex = NULL;
1062 else {
1063 if (value_regex[0] == '!') {
1064 store.do_not_match = 1;
1065 value_regex++;
1066 } else
1067 store.do_not_match = 0;
1068
1069 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1070 if (regcomp(store.value_regex, value_regex,
1071 REG_EXTENDED)) {
1072 error("invalid pattern: %s", value_regex);
1073 free(store.value_regex);
1074 ret = 6;
1075 goto out_free;
1076 }
1077 }
1078
1079 store.offset[0] = 0;
1080 store.state = START;
1081 store.seen = 0;
1082
1083 /*
1084 * After this, store.offset will contain the *end* offset
1085 * of the last match, or remain at 0 if no match was found.
1086 * As a side effect, we make sure to transform only a valid
1087 * existing config file.
1088 */
1089 if (git_config_from_file(store_aux, config_filename, NULL)) {
1090 error("invalid config file %s", config_filename);
1091 free(store.key);
1092 if (store.value_regex != NULL) {
1093 regfree(store.value_regex);
1094 free(store.value_regex);
1095 }
1096 ret = 3;
1097 goto out_free;
1098 }
1099
1100 free(store.key);
1101 if (store.value_regex != NULL) {
1102 regfree(store.value_regex);
1103 free(store.value_regex);
1104 }
1105
1106 /* if nothing to unset, or too many matches, error out */
1107 if ((store.seen == 0 && value == NULL) ||
1108 (store.seen > 1 && multi_replace == 0)) {
1109 ret = 5;
1110 goto out_free;
1111 }
1112
1113 fstat(in_fd, &st);
1114 contents_sz = xsize_t(st.st_size);
1115 contents = xmmap(NULL, contents_sz, PROT_READ,
1116 MAP_PRIVATE, in_fd, 0);
1117 close(in_fd);
1118
1119 if (store.seen == 0)
1120 store.seen = 1;
1121
1122 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1123 if (store.offset[i] == 0) {
1124 store.offset[i] = copy_end = contents_sz;
1125 } else if (store.state != KEY_SEEN) {
1126 copy_end = store.offset[i];
1127 } else
1128 copy_end = find_beginning_of_line(
1129 contents, contents_sz,
1130 store.offset[i]-2, &new_line);
1131
1132 if (copy_end > 0 && contents[copy_end-1] != '\n')
1133 new_line = 1;
1134
1135 /* write the first part of the config */
1136 if (copy_end > copy_begin) {
1137 if (write_in_full(fd, contents + copy_begin,
1138 copy_end - copy_begin) <
1139 copy_end - copy_begin)
1140 goto write_err_out;
1141 if (new_line &&
1142 write_str_in_full(fd, "\n") != 1)
1143 goto write_err_out;
1144 }
1145 copy_begin = store.offset[i];
1146 }
1147
1148 /* write the pair (value == NULL means unset) */
1149 if (value != NULL) {
1150 if (store.state == START) {
1151 if (!store_write_section(fd, key))
1152 goto write_err_out;
1153 }
1154 if (!store_write_pair(fd, key, value))
1155 goto write_err_out;
1156 }
1157
1158 /* write the rest of the config */
1159 if (copy_begin < contents_sz)
1160 if (write_in_full(fd, contents + copy_begin,
1161 contents_sz - copy_begin) <
1162 contents_sz - copy_begin)
1163 goto write_err_out;
1164
1165 munmap(contents, contents_sz);
1166 }
1167
1168 if (commit_lock_file(lock) < 0) {
1169 error("could not commit config file %s", config_filename);
1170 ret = 4;
1171 goto out_free;
1172 }
1173
1174 /*
1175 * lock is committed, so don't try to roll it back below.
1176 * NOTE: Since lockfile.c keeps a linked list of all created
1177 * lock_file structures, it isn't safe to free(lock). It's
1178 * better to just leave it hanging around.
1179 */
1180 lock = NULL;
1181 ret = 0;
1182
1183 out_free:
1184 if (lock)
1185 rollback_lock_file(lock);
1186 free(config_filename);
1187 return ret;
1188
1189 write_err_out:
1190 ret = write_error(lock->filename);
1191 goto out_free;
1192
1193 }
1194
1195 static int section_name_match (const char *buf, const char *name)
1196 {
1197 int i = 0, j = 0, dot = 0;
1198 if (buf[i] != '[')
1199 return 0;
1200 for (i = 1; buf[i] && buf[i] != ']'; i++) {
1201 if (!dot && isspace(buf[i])) {
1202 dot = 1;
1203 if (name[j++] != '.')
1204 break;
1205 for (i++; isspace(buf[i]); i++)
1206 ; /* do nothing */
1207 if (buf[i] != '"')
1208 break;
1209 continue;
1210 }
1211 if (buf[i] == '\\' && dot)
1212 i++;
1213 else if (buf[i] == '"' && dot) {
1214 for (i++; isspace(buf[i]); i++)
1215 ; /* do_nothing */
1216 break;
1217 }
1218 if (buf[i] != name[j++])
1219 break;
1220 }
1221 if (buf[i] == ']' && name[j] == 0) {
1222 /*
1223 * We match, now just find the right length offset by
1224 * gobbling up any whitespace after it, as well
1225 */
1226 i++;
1227 for (; buf[i] && isspace(buf[i]); i++)
1228 ; /* do nothing */
1229 return i;
1230 }
1231 return 0;
1232 }
1233
1234 /* if new_name == NULL, the section is removed instead */
1235 int git_config_rename_section(const char *old_name, const char *new_name)
1236 {
1237 int ret = 0, remove = 0;
1238 char *config_filename;
1239 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1240 int out_fd;
1241 char buf[1024];
1242
1243 if (config_exclusive_filename)
1244 config_filename = xstrdup(config_exclusive_filename);
1245 else
1246 config_filename = git_pathdup("config");
1247 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1248 if (out_fd < 0) {
1249 ret = error("could not lock config file %s", config_filename);
1250 goto out;
1251 }
1252
1253 if (!(config_file = fopen(config_filename, "rb"))) {
1254 /* no config file means nothing to rename, no error */
1255 goto unlock_and_out;
1256 }
1257
1258 while (fgets(buf, sizeof(buf), config_file)) {
1259 int i;
1260 int length;
1261 char *output = buf;
1262 for (i = 0; buf[i] && isspace(buf[i]); i++)
1263 ; /* do nothing */
1264 if (buf[i] == '[') {
1265 /* it's a section */
1266 int offset = section_name_match(&buf[i], old_name);
1267 if (offset > 0) {
1268 ret++;
1269 if (new_name == NULL) {
1270 remove = 1;
1271 continue;
1272 }
1273 store.baselen = strlen(new_name);
1274 if (!store_write_section(out_fd, new_name)) {
1275 ret = write_error(lock->filename);
1276 goto out;
1277 }
1278 /*
1279 * We wrote out the new section, with
1280 * a newline, now skip the old
1281 * section's length
1282 */
1283 output += offset + i;
1284 if (strlen(output) > 0) {
1285 /*
1286 * More content means there's
1287 * a declaration to put on the
1288 * next line; indent with a
1289 * tab
1290 */
1291 output -= 1;
1292 output[0] = '\t';
1293 }
1294 }
1295 remove = 0;
1296 }
1297 if (remove)
1298 continue;
1299 length = strlen(output);
1300 if (write_in_full(out_fd, output, length) != length) {
1301 ret = write_error(lock->filename);
1302 goto out;
1303 }
1304 }
1305 fclose(config_file);
1306 unlock_and_out:
1307 if (commit_lock_file(lock) < 0)
1308 ret = error("could not commit config file %s", config_filename);
1309 out:
1310 free(config_filename);
1311 return ret;
1312 }
1313
1314 /*
1315 * Call this to report error for your variable that should not
1316 * get a boolean value (i.e. "[my] var" means "true").
1317 */
1318 int config_error_nonbool(const char *var)
1319 {
1320 return error("Missing value for '%s'", var);
1321 }