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
13static FILE *config_file;
14static const char *config_file_name;
15static int config_linenr;
16static int config_file_eof;
17static int zlib_compression_seen;
18
19const char *config_exclusive_filename = NULL;
20
21static 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
47static 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 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
111static inline int iskeychar(int c)
112{
113 return isalnum(c) || c == '-';
114}
115
116static 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
147static 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
182static 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
202static 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
258static 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
277static 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
291int 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
304static 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
311int 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
319unsigned 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
327int 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") || !strcasecmp(value, "on"))
335 return 1;
336 if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off"))
337 return 0;
338 *is_bool = 0;
339 return git_config_int(name, value);
340}
341
342int 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
348int 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
356static 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 if (!strcmp(var, "core.preloadindex")) {
494 core_preload_index = git_config_bool(var, value);
495 return 0;
496 }
497
498 /* Add other config variables here and to Documentation/config.txt. */
499 return 0;
500}
501
502static int git_default_user_config(const char *var, const char *value)
503{
504 if (!strcmp(var, "user.name")) {
505 if (!value)
506 return config_error_nonbool(var);
507 strlcpy(git_default_name, value, sizeof(git_default_name));
508 if (git_default_email[0])
509 user_ident_explicitly_given = 1;
510 return 0;
511 }
512
513 if (!strcmp(var, "user.email")) {
514 if (!value)
515 return config_error_nonbool(var);
516 strlcpy(git_default_email, value, sizeof(git_default_email));
517 if (git_default_name[0])
518 user_ident_explicitly_given = 1;
519 return 0;
520 }
521
522 /* Add other config variables here and to Documentation/config.txt. */
523 return 0;
524}
525
526static int git_default_i18n_config(const char *var, const char *value)
527{
528 if (!strcmp(var, "i18n.commitencoding"))
529 return git_config_string(&git_commit_encoding, var, value);
530
531 if (!strcmp(var, "i18n.logoutputencoding"))
532 return git_config_string(&git_log_output_encoding, var, value);
533
534 /* Add other config variables here and to Documentation/config.txt. */
535 return 0;
536}
537
538static int git_default_branch_config(const char *var, const char *value)
539{
540 if (!strcmp(var, "branch.autosetupmerge")) {
541 if (value && !strcasecmp(value, "always")) {
542 git_branch_track = BRANCH_TRACK_ALWAYS;
543 return 0;
544 }
545 git_branch_track = git_config_bool(var, value);
546 return 0;
547 }
548 if (!strcmp(var, "branch.autosetuprebase")) {
549 if (!value)
550 return config_error_nonbool(var);
551 else if (!strcmp(value, "never"))
552 autorebase = AUTOREBASE_NEVER;
553 else if (!strcmp(value, "local"))
554 autorebase = AUTOREBASE_LOCAL;
555 else if (!strcmp(value, "remote"))
556 autorebase = AUTOREBASE_REMOTE;
557 else if (!strcmp(value, "always"))
558 autorebase = AUTOREBASE_ALWAYS;
559 else
560 return error("Malformed value for %s", var);
561 return 0;
562 }
563
564 /* Add other config variables here and to Documentation/config.txt. */
565 return 0;
566}
567
568static int git_default_push_config(const char *var, const char *value)
569{
570 if (!strcmp(var, "push.default")) {
571 if (!value)
572 return config_error_nonbool(var);
573 else if (!strcmp(value, "nothing"))
574 push_default = PUSH_DEFAULT_NOTHING;
575 else if (!strcmp(value, "matching"))
576 push_default = PUSH_DEFAULT_MATCHING;
577 else if (!strcmp(value, "tracking"))
578 push_default = PUSH_DEFAULT_TRACKING;
579 else if (!strcmp(value, "current"))
580 push_default = PUSH_DEFAULT_CURRENT;
581 else {
582 error("Malformed value for %s: %s", var, value);
583 return error("Must be one of nothing, matching, "
584 "tracking or current.");
585 }
586 return 0;
587 }
588
589 /* Add other config variables here and to Documentation/config.txt. */
590 return 0;
591}
592
593static int git_default_mailmap_config(const char *var, const char *value)
594{
595 if (!strcmp(var, "mailmap.file"))
596 return git_config_string(&git_mailmap_file, var, value);
597
598 /* Add other config variables here and to Documentation/config.txt. */
599 return 0;
600}
601
602int git_default_config(const char *var, const char *value, void *dummy)
603{
604 if (!prefixcmp(var, "core."))
605 return git_default_core_config(var, value);
606
607 if (!prefixcmp(var, "user."))
608 return git_default_user_config(var, value);
609
610 if (!prefixcmp(var, "i18n."))
611 return git_default_i18n_config(var, value);
612
613 if (!prefixcmp(var, "branch."))
614 return git_default_branch_config(var, value);
615
616 if (!prefixcmp(var, "push."))
617 return git_default_push_config(var, value);
618
619 if (!prefixcmp(var, "mailmap."))
620 return git_default_mailmap_config(var, value);
621
622 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
623 pager_use_color = git_config_bool(var,value);
624 return 0;
625 }
626
627 /* Add other config variables here and to Documentation/config.txt. */
628 return 0;
629}
630
631int git_config_from_file(config_fn_t fn, const char *filename, void *data)
632{
633 int ret;
634 FILE *f = fopen(filename, "r");
635
636 ret = -1;
637 if (f) {
638 config_file = f;
639 config_file_name = filename;
640 config_linenr = 1;
641 config_file_eof = 0;
642 ret = git_parse_file(fn, data);
643 fclose(f);
644 config_file_name = NULL;
645 }
646 return ret;
647}
648
649const char *git_etc_gitconfig(void)
650{
651 static const char *system_wide;
652 if (!system_wide)
653 system_wide = system_path(ETC_GITCONFIG);
654 return system_wide;
655}
656
657static int git_env_bool(const char *k, int def)
658{
659 const char *v = getenv(k);
660 return v ? git_config_bool(k, v) : def;
661}
662
663int git_config_system(void)
664{
665 return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
666}
667
668int git_config_global(void)
669{
670 return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
671}
672
673int git_config(config_fn_t fn, void *data)
674{
675 int ret = 0, found = 0;
676 char *repo_config = NULL;
677 const char *home = NULL;
678
679 /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
680 if (config_exclusive_filename)
681 return git_config_from_file(fn, config_exclusive_filename, data);
682 if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
683 ret += git_config_from_file(fn, git_etc_gitconfig(),
684 data);
685 found += 1;
686 }
687
688 home = getenv("HOME");
689 if (git_config_global() && home) {
690 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
691 if (!access(user_config, R_OK)) {
692 ret += git_config_from_file(fn, user_config, data);
693 found += 1;
694 }
695 free(user_config);
696 }
697
698 repo_config = git_pathdup("config");
699 if (!access(repo_config, R_OK)) {
700 ret += git_config_from_file(fn, repo_config, data);
701 found += 1;
702 }
703 free(repo_config);
704 if (found == 0)
705 return -1;
706 return ret;
707}
708
709/*
710 * Find all the stuff for git_config_set() below.
711 */
712
713#define MAX_MATCHES 512
714
715static struct {
716 int baselen;
717 char* key;
718 int do_not_match;
719 regex_t* value_regex;
720 int multi_replace;
721 size_t offset[MAX_MATCHES];
722 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
723 int seen;
724} store;
725
726static int matches(const char* key, const char* value)
727{
728 return !strcmp(key, store.key) &&
729 (store.value_regex == NULL ||
730 (store.do_not_match ^
731 !regexec(store.value_regex, value, 0, NULL, 0)));
732}
733
734static int store_aux(const char* key, const char* value, void *cb)
735{
736 const char *ep;
737 size_t section_len;
738
739 switch (store.state) {
740 case KEY_SEEN:
741 if (matches(key, value)) {
742 if (store.seen == 1 && store.multi_replace == 0) {
743 warning("%s has multiple values", key);
744 } else if (store.seen >= MAX_MATCHES) {
745 error("too many matches for %s", key);
746 return 1;
747 }
748
749 store.offset[store.seen] = ftell(config_file);
750 store.seen++;
751 }
752 break;
753 case SECTION_SEEN:
754 /*
755 * What we are looking for is in store.key (both
756 * section and var), and its section part is baselen
757 * long. We found key (again, both section and var).
758 * We would want to know if this key is in the same
759 * section as what we are looking for. We already
760 * know we are in the same section as what should
761 * hold store.key.
762 */
763 ep = strrchr(key, '.');
764 section_len = ep - key;
765
766 if ((section_len != store.baselen) ||
767 memcmp(key, store.key, section_len+1)) {
768 store.state = SECTION_END_SEEN;
769 break;
770 }
771
772 /*
773 * Do not increment matches: this is no match, but we
774 * just made sure we are in the desired section.
775 */
776 store.offset[store.seen] = ftell(config_file);
777 /* fallthru */
778 case SECTION_END_SEEN:
779 case START:
780 if (matches(key, value)) {
781 store.offset[store.seen] = ftell(config_file);
782 store.state = KEY_SEEN;
783 store.seen++;
784 } else {
785 if (strrchr(key, '.') - key == store.baselen &&
786 !strncmp(key, store.key, store.baselen)) {
787 store.state = SECTION_SEEN;
788 store.offset[store.seen] = ftell(config_file);
789 }
790 }
791 }
792 return 0;
793}
794
795static int write_error(const char *filename)
796{
797 error("failed to write new configuration file %s", filename);
798
799 /* Same error code as "failed to rename". */
800 return 4;
801}
802
803static int store_write_section(int fd, const char* key)
804{
805 const char *dot;
806 int i, success;
807 struct strbuf sb = STRBUF_INIT;
808
809 dot = memchr(key, '.', store.baselen);
810 if (dot) {
811 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
812 for (i = dot - key + 1; i < store.baselen; i++) {
813 if (key[i] == '"' || key[i] == '\\')
814 strbuf_addch(&sb, '\\');
815 strbuf_addch(&sb, key[i]);
816 }
817 strbuf_addstr(&sb, "\"]\n");
818 } else {
819 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
820 }
821
822 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
823 strbuf_release(&sb);
824
825 return success;
826}
827
828static int store_write_pair(int fd, const char* key, const char* value)
829{
830 int i, success;
831 int length = strlen(key + store.baselen + 1);
832 const char *quote = "";
833 struct strbuf sb = STRBUF_INIT;
834
835 /*
836 * Check to see if the value needs to be surrounded with a dq pair.
837 * Note that problematic characters are always backslash-quoted; this
838 * check is about not losing leading or trailing SP and strings that
839 * follow beginning-of-comment characters (i.e. ';' and '#') by the
840 * configuration parser.
841 */
842 if (value[0] == ' ')
843 quote = "\"";
844 for (i = 0; value[i]; i++)
845 if (value[i] == ';' || value[i] == '#')
846 quote = "\"";
847 if (i && value[i - 1] == ' ')
848 quote = "\"";
849
850 strbuf_addf(&sb, "\t%.*s = %s",
851 length, key + store.baselen + 1, quote);
852
853 for (i = 0; value[i]; i++)
854 switch (value[i]) {
855 case '\n':
856 strbuf_addstr(&sb, "\\n");
857 break;
858 case '\t':
859 strbuf_addstr(&sb, "\\t");
860 break;
861 case '"':
862 case '\\':
863 strbuf_addch(&sb, '\\');
864 default:
865 strbuf_addch(&sb, value[i]);
866 break;
867 }
868 strbuf_addf(&sb, "%s\n", quote);
869
870 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
871 strbuf_release(&sb);
872
873 return success;
874}
875
876static ssize_t find_beginning_of_line(const char* contents, size_t size,
877 size_t offset_, int* found_bracket)
878{
879 size_t equal_offset = size, bracket_offset = size;
880 ssize_t offset;
881
882contline:
883 for (offset = offset_-2; offset > 0
884 && contents[offset] != '\n'; offset--)
885 switch (contents[offset]) {
886 case '=': equal_offset = offset; break;
887 case ']': bracket_offset = offset; break;
888 }
889 if (offset > 0 && contents[offset-1] == '\\') {
890 offset_ = offset;
891 goto contline;
892 }
893 if (bracket_offset < equal_offset) {
894 *found_bracket = 1;
895 offset = bracket_offset+1;
896 } else
897 offset++;
898
899 return offset;
900}
901
902int git_config_set(const char* key, const char* value)
903{
904 return git_config_set_multivar(key, value, NULL, 0);
905}
906
907/*
908 * If value==NULL, unset in (remove from) config,
909 * if value_regex!=NULL, disregard key/value pairs where value does not match.
910 * if multi_replace==0, nothing, or only one matching key/value is replaced,
911 * else all matching key/values (regardless how many) are removed,
912 * before the new pair is written.
913 *
914 * Returns 0 on success.
915 *
916 * This function does this:
917 *
918 * - it locks the config file by creating ".git/config.lock"
919 *
920 * - it then parses the config using store_aux() as validator to find
921 * the position on the key/value pair to replace. If it is to be unset,
922 * it must be found exactly once.
923 *
924 * - the config file is mmap()ed and the part before the match (if any) is
925 * written to the lock file, then the changed part and the rest.
926 *
927 * - the config file is removed and the lock file rename()d to it.
928 *
929 */
930int git_config_set_multivar(const char* key, const char* value,
931 const char* value_regex, int multi_replace)
932{
933 int i, dot;
934 int fd = -1, in_fd;
935 int ret;
936 char* config_filename;
937 struct lock_file *lock = NULL;
938 const char* last_dot = strrchr(key, '.');
939
940 if (config_exclusive_filename)
941 config_filename = xstrdup(config_exclusive_filename);
942 else
943 config_filename = git_pathdup("config");
944
945 /*
946 * Since "key" actually contains the section name and the real
947 * key name separated by a dot, we have to know where the dot is.
948 */
949
950 if (last_dot == NULL) {
951 error("key does not contain a section: %s", key);
952 ret = 2;
953 goto out_free;
954 }
955 store.baselen = last_dot - key;
956
957 store.multi_replace = multi_replace;
958
959 /*
960 * Validate the key and while at it, lower case it for matching.
961 */
962 store.key = xmalloc(strlen(key) + 1);
963 dot = 0;
964 for (i = 0; key[i]; i++) {
965 unsigned char c = key[i];
966 if (c == '.')
967 dot = 1;
968 /* Leave the extended basename untouched.. */
969 if (!dot || i > store.baselen) {
970 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
971 error("invalid key: %s", key);
972 free(store.key);
973 ret = 1;
974 goto out_free;
975 }
976 c = tolower(c);
977 } else if (c == '\n') {
978 error("invalid key (newline): %s", key);
979 free(store.key);
980 ret = 1;
981 goto out_free;
982 }
983 store.key[i] = c;
984 }
985 store.key[i] = 0;
986
987 /*
988 * The lock serves a purpose in addition to locking: the new
989 * contents of .git/config will be written into it.
990 */
991 lock = xcalloc(sizeof(struct lock_file), 1);
992 fd = hold_lock_file_for_update(lock, config_filename, 0);
993 if (fd < 0) {
994 error("could not lock config file %s", config_filename);
995 free(store.key);
996 ret = -1;
997 goto out_free;
998 }
999
1000 /*
1001 * If .git/config does not exist yet, write a minimal version.
1002 */
1003 in_fd = open(config_filename, O_RDONLY);
1004 if ( in_fd < 0 ) {
1005 free(store.key);
1006
1007 if ( ENOENT != errno ) {
1008 error("opening %s: %s", config_filename,
1009 strerror(errno));
1010 ret = 3; /* same as "invalid config file" */
1011 goto out_free;
1012 }
1013 /* if nothing to unset, error out */
1014 if (value == NULL) {
1015 ret = 5;
1016 goto out_free;
1017 }
1018
1019 store.key = (char*)key;
1020 if (!store_write_section(fd, key) ||
1021 !store_write_pair(fd, key, value))
1022 goto write_err_out;
1023 } else {
1024 struct stat st;
1025 char* contents;
1026 size_t contents_sz, copy_begin, copy_end;
1027 int i, new_line = 0;
1028
1029 if (value_regex == NULL)
1030 store.value_regex = NULL;
1031 else {
1032 if (value_regex[0] == '!') {
1033 store.do_not_match = 1;
1034 value_regex++;
1035 } else
1036 store.do_not_match = 0;
1037
1038 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1039 if (regcomp(store.value_regex, value_regex,
1040 REG_EXTENDED)) {
1041 error("invalid pattern: %s", value_regex);
1042 free(store.value_regex);
1043 ret = 6;
1044 goto out_free;
1045 }
1046 }
1047
1048 store.offset[0] = 0;
1049 store.state = START;
1050 store.seen = 0;
1051
1052 /*
1053 * After this, store.offset will contain the *end* offset
1054 * of the last match, or remain at 0 if no match was found.
1055 * As a side effect, we make sure to transform only a valid
1056 * existing config file.
1057 */
1058 if (git_config_from_file(store_aux, config_filename, NULL)) {
1059 error("invalid config file %s", config_filename);
1060 free(store.key);
1061 if (store.value_regex != NULL) {
1062 regfree(store.value_regex);
1063 free(store.value_regex);
1064 }
1065 ret = 3;
1066 goto out_free;
1067 }
1068
1069 free(store.key);
1070 if (store.value_regex != NULL) {
1071 regfree(store.value_regex);
1072 free(store.value_regex);
1073 }
1074
1075 /* if nothing to unset, or too many matches, error out */
1076 if ((store.seen == 0 && value == NULL) ||
1077 (store.seen > 1 && multi_replace == 0)) {
1078 ret = 5;
1079 goto out_free;
1080 }
1081
1082 fstat(in_fd, &st);
1083 contents_sz = xsize_t(st.st_size);
1084 contents = xmmap(NULL, contents_sz, PROT_READ,
1085 MAP_PRIVATE, in_fd, 0);
1086 close(in_fd);
1087
1088 if (store.seen == 0)
1089 store.seen = 1;
1090
1091 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1092 if (store.offset[i] == 0) {
1093 store.offset[i] = copy_end = contents_sz;
1094 } else if (store.state != KEY_SEEN) {
1095 copy_end = store.offset[i];
1096 } else
1097 copy_end = find_beginning_of_line(
1098 contents, contents_sz,
1099 store.offset[i]-2, &new_line);
1100
1101 if (copy_end > 0 && contents[copy_end-1] != '\n')
1102 new_line = 1;
1103
1104 /* write the first part of the config */
1105 if (copy_end > copy_begin) {
1106 if (write_in_full(fd, contents + copy_begin,
1107 copy_end - copy_begin) <
1108 copy_end - copy_begin)
1109 goto write_err_out;
1110 if (new_line &&
1111 write_in_full(fd, "\n", 1) != 1)
1112 goto write_err_out;
1113 }
1114 copy_begin = store.offset[i];
1115 }
1116
1117 /* write the pair (value == NULL means unset) */
1118 if (value != NULL) {
1119 if (store.state == START) {
1120 if (!store_write_section(fd, key))
1121 goto write_err_out;
1122 }
1123 if (!store_write_pair(fd, key, value))
1124 goto write_err_out;
1125 }
1126
1127 /* write the rest of the config */
1128 if (copy_begin < contents_sz)
1129 if (write_in_full(fd, contents + copy_begin,
1130 contents_sz - copy_begin) <
1131 contents_sz - copy_begin)
1132 goto write_err_out;
1133
1134 munmap(contents, contents_sz);
1135 }
1136
1137 if (commit_lock_file(lock) < 0) {
1138 error("could not commit config file %s", config_filename);
1139 ret = 4;
1140 goto out_free;
1141 }
1142
1143 /*
1144 * lock is committed, so don't try to roll it back below.
1145 * NOTE: Since lockfile.c keeps a linked list of all created
1146 * lock_file structures, it isn't safe to free(lock). It's
1147 * better to just leave it hanging around.
1148 */
1149 lock = NULL;
1150 ret = 0;
1151
1152out_free:
1153 if (lock)
1154 rollback_lock_file(lock);
1155 free(config_filename);
1156 return ret;
1157
1158write_err_out:
1159 ret = write_error(lock->filename);
1160 goto out_free;
1161
1162}
1163
1164static int section_name_match (const char *buf, const char *name)
1165{
1166 int i = 0, j = 0, dot = 0;
1167 for (; buf[i] && buf[i] != ']'; i++) {
1168 if (!dot && isspace(buf[i])) {
1169 dot = 1;
1170 if (name[j++] != '.')
1171 break;
1172 for (i++; isspace(buf[i]); i++)
1173 ; /* do nothing */
1174 if (buf[i] != '"')
1175 break;
1176 continue;
1177 }
1178 if (buf[i] == '\\' && dot)
1179 i++;
1180 else if (buf[i] == '"' && dot) {
1181 for (i++; isspace(buf[i]); i++)
1182 ; /* do_nothing */
1183 break;
1184 }
1185 if (buf[i] != name[j++])
1186 break;
1187 }
1188 return (buf[i] == ']' && name[j] == 0);
1189}
1190
1191/* if new_name == NULL, the section is removed instead */
1192int git_config_rename_section(const char *old_name, const char *new_name)
1193{
1194 int ret = 0, remove = 0;
1195 char *config_filename;
1196 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1197 int out_fd;
1198 char buf[1024];
1199
1200 if (config_exclusive_filename)
1201 config_filename = xstrdup(config_exclusive_filename);
1202 else
1203 config_filename = git_pathdup("config");
1204 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1205 if (out_fd < 0) {
1206 ret = error("could not lock config file %s", config_filename);
1207 goto out;
1208 }
1209
1210 if (!(config_file = fopen(config_filename, "rb"))) {
1211 /* no config file means nothing to rename, no error */
1212 goto unlock_and_out;
1213 }
1214
1215 while (fgets(buf, sizeof(buf), config_file)) {
1216 int i;
1217 int length;
1218 for (i = 0; buf[i] && isspace(buf[i]); i++)
1219 ; /* do nothing */
1220 if (buf[i] == '[') {
1221 /* it's a section */
1222 if (section_name_match (&buf[i+1], old_name)) {
1223 ret++;
1224 if (new_name == NULL) {
1225 remove = 1;
1226 continue;
1227 }
1228 store.baselen = strlen(new_name);
1229 if (!store_write_section(out_fd, new_name)) {
1230 ret = write_error(lock->filename);
1231 goto out;
1232 }
1233 continue;
1234 }
1235 remove = 0;
1236 }
1237 if (remove)
1238 continue;
1239 length = strlen(buf);
1240 if (write_in_full(out_fd, buf, length) != length) {
1241 ret = write_error(lock->filename);
1242 goto out;
1243 }
1244 }
1245 fclose(config_file);
1246 unlock_and_out:
1247 if (commit_lock_file(lock) < 0)
1248 ret = error("could not commit config file %s", config_filename);
1249 out:
1250 free(config_filename);
1251 return ret;
1252}
1253
1254/*
1255 * Call this to report error for your variable that should not
1256 * get a boolean value (i.e. "[my] var" means "true").
1257 */
1258int config_error_nonbool(const char *var)
1259{
1260 return error("Missing value for '%s'", var);
1261}