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 #include "strbuf.h"
11 #include "quote.h"
13 #define MAXNAME (256)
15 typedef struct config_file {
16 struct config_file *prev;
17 FILE *f;
18 const char *name;
19 int linenr;
20 int eof;
21 struct strbuf value;
22 char var[MAXNAME];
23 } config_file;
25 static config_file *cf;
27 static int zlib_compression_seen;
29 const char *config_exclusive_filename = NULL;
31 static void lowercase(char *p)
32 {
33 for (; *p; p++)
34 *p = tolower(*p);
35 }
37 void git_config_push_parameter(const char *text)
38 {
39 struct strbuf env = STRBUF_INIT;
40 const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
41 if (old) {
42 strbuf_addstr(&env, old);
43 strbuf_addch(&env, ' ');
44 }
45 sq_quote_buf(&env, text);
46 setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
47 strbuf_release(&env);
48 }
50 int git_config_parse_parameter(const char *text,
51 config_fn_t fn, void *data)
52 {
53 struct strbuf **pair;
54 pair = strbuf_split_str(text, '=', 2);
55 if (!pair[0])
56 return error("bogus config parameter: %s", text);
57 if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
58 strbuf_setlen(pair[0], pair[0]->len - 1);
59 strbuf_trim(pair[0]);
60 if (!pair[0]->len) {
61 strbuf_list_free(pair);
62 return error("bogus config parameter: %s", text);
63 }
64 lowercase(pair[0]->buf);
65 if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
66 strbuf_list_free(pair);
67 return -1;
68 }
69 strbuf_list_free(pair);
70 return 0;
71 }
73 int git_config_from_parameters(config_fn_t fn, void *data)
74 {
75 const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
76 char *envw;
77 const char **argv = NULL;
78 int nr = 0, alloc = 0;
79 int i;
81 if (!env)
82 return 0;
83 /* sq_dequote will write over it */
84 envw = xstrdup(env);
86 if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
87 free(envw);
88 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
89 }
91 for (i = 0; i < nr; i++) {
92 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
93 free(argv);
94 free(envw);
95 return -1;
96 }
97 }
99 free(argv);
100 free(envw);
101 return nr > 0;
102 }
104 static int get_next_char(void)
105 {
106 int c;
107 FILE *f;
109 c = '\n';
110 if (cf && ((f = cf->f) != NULL)) {
111 c = fgetc(f);
112 if (c == '\r') {
113 /* DOS like systems */
114 c = fgetc(f);
115 if (c != '\n') {
116 ungetc(c, f);
117 c = '\r';
118 }
119 }
120 if (c == '\n')
121 cf->linenr++;
122 if (c == EOF) {
123 cf->eof = 1;
124 c = '\n';
125 }
126 }
127 return c;
128 }
130 static char *parse_value(void)
131 {
132 int quote = 0, comment = 0, space = 0;
134 strbuf_reset(&cf->value);
135 for (;;) {
136 int c = get_next_char();
137 if (c == '\n') {
138 if (quote)
139 return NULL;
140 return cf->value.buf;
141 }
142 if (comment)
143 continue;
144 if (isspace(c) && !quote) {
145 if (cf->value.len)
146 space++;
147 continue;
148 }
149 if (!quote) {
150 if (c == ';' || c == '#') {
151 comment = 1;
152 continue;
153 }
154 }
155 for (; space; space--)
156 strbuf_addch(&cf->value, ' ');
157 if (c == '\\') {
158 c = get_next_char();
159 switch (c) {
160 case '\n':
161 continue;
162 case 't':
163 c = '\t';
164 break;
165 case 'b':
166 c = '\b';
167 break;
168 case 'n':
169 c = '\n';
170 break;
171 /* Some characters escape as themselves */
172 case '\\': case '"':
173 break;
174 /* Reject unknown escape sequences */
175 default:
176 return NULL;
177 }
178 strbuf_addch(&cf->value, c);
179 continue;
180 }
181 if (c == '"') {
182 quote = 1-quote;
183 continue;
184 }
185 strbuf_addch(&cf->value, c);
186 }
187 }
189 static inline int iskeychar(int c)
190 {
191 return isalnum(c) || c == '-';
192 }
194 static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
195 {
196 int c;
197 char *value;
199 /* Get the full name */
200 for (;;) {
201 c = get_next_char();
202 if (cf->eof)
203 break;
204 if (!iskeychar(c))
205 break;
206 name[len++] = tolower(c);
207 if (len >= MAXNAME)
208 return -1;
209 }
210 name[len] = 0;
211 while (c == ' ' || c == '\t')
212 c = get_next_char();
214 value = NULL;
215 if (c != '\n') {
216 if (c != '=')
217 return -1;
218 value = parse_value();
219 if (!value)
220 return -1;
221 }
222 return fn(name, value, data);
223 }
225 static int get_extended_base_var(char *name, int baselen, int c)
226 {
227 do {
228 if (c == '\n')
229 return -1;
230 c = get_next_char();
231 } while (isspace(c));
233 /* We require the format to be '[base "extension"]' */
234 if (c != '"')
235 return -1;
236 name[baselen++] = '.';
238 for (;;) {
239 int c = get_next_char();
240 if (c == '\n')
241 return -1;
242 if (c == '"')
243 break;
244 if (c == '\\') {
245 c = get_next_char();
246 if (c == '\n')
247 return -1;
248 }
249 name[baselen++] = c;
250 if (baselen > MAXNAME / 2)
251 return -1;
252 }
254 /* Final ']' */
255 if (get_next_char() != ']')
256 return -1;
257 return baselen;
258 }
260 static int get_base_var(char *name)
261 {
262 int baselen = 0;
264 for (;;) {
265 int c = get_next_char();
266 if (cf->eof)
267 return -1;
268 if (c == ']')
269 return baselen;
270 if (isspace(c))
271 return get_extended_base_var(name, baselen, c);
272 if (!iskeychar(c) && c != '.')
273 return -1;
274 if (baselen > MAXNAME / 2)
275 return -1;
276 name[baselen++] = tolower(c);
277 }
278 }
280 static int git_parse_file(config_fn_t fn, void *data)
281 {
282 int comment = 0;
283 int baselen = 0;
284 char *var = cf->var;
286 /* U+FEFF Byte Order Mark in UTF8 */
287 static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
288 const unsigned char *bomptr = utf8_bom;
290 for (;;) {
291 int c = get_next_char();
292 if (bomptr && *bomptr) {
293 /* We are at the file beginning; skip UTF8-encoded BOM
294 * if present. Sane editors won't put this in on their
295 * own, but e.g. Windows Notepad will do it happily. */
296 if ((unsigned char) c == *bomptr) {
297 bomptr++;
298 continue;
299 } else {
300 /* Do not tolerate partial BOM. */
301 if (bomptr != utf8_bom)
302 break;
303 /* No BOM at file beginning. Cool. */
304 bomptr = NULL;
305 }
306 }
307 if (c == '\n') {
308 if (cf->eof)
309 return 0;
310 comment = 0;
311 continue;
312 }
313 if (comment || isspace(c))
314 continue;
315 if (c == '#' || c == ';') {
316 comment = 1;
317 continue;
318 }
319 if (c == '[') {
320 baselen = get_base_var(var);
321 if (baselen <= 0)
322 break;
323 var[baselen++] = '.';
324 var[baselen] = 0;
325 continue;
326 }
327 if (!isalpha(c))
328 break;
329 var[baselen] = tolower(c);
330 if (get_value(fn, data, var, baselen+1) < 0)
331 break;
332 }
333 die("bad config file line %d in %s", cf->linenr, cf->name);
334 }
336 static int parse_unit_factor(const char *end, unsigned long *val)
337 {
338 if (!*end)
339 return 1;
340 else if (!strcasecmp(end, "k")) {
341 *val *= 1024;
342 return 1;
343 }
344 else if (!strcasecmp(end, "m")) {
345 *val *= 1024 * 1024;
346 return 1;
347 }
348 else if (!strcasecmp(end, "g")) {
349 *val *= 1024 * 1024 * 1024;
350 return 1;
351 }
352 return 0;
353 }
355 static int git_parse_long(const char *value, long *ret)
356 {
357 if (value && *value) {
358 char *end;
359 long val = strtol(value, &end, 0);
360 unsigned long factor = 1;
361 if (!parse_unit_factor(end, &factor))
362 return 0;
363 *ret = val * factor;
364 return 1;
365 }
366 return 0;
367 }
369 int git_parse_ulong(const char *value, unsigned long *ret)
370 {
371 if (value && *value) {
372 char *end;
373 unsigned long val = strtoul(value, &end, 0);
374 if (!parse_unit_factor(end, &val))
375 return 0;
376 *ret = val;
377 return 1;
378 }
379 return 0;
380 }
382 static void die_bad_config(const char *name)
383 {
384 if (cf && cf->name)
385 die("bad config value for '%s' in %s", name, cf->name);
386 die("bad config value for '%s'", name);
387 }
389 int git_config_int(const char *name, const char *value)
390 {
391 long ret = 0;
392 if (!git_parse_long(value, &ret))
393 die_bad_config(name);
394 return ret;
395 }
397 unsigned long git_config_ulong(const char *name, const char *value)
398 {
399 unsigned long ret;
400 if (!git_parse_ulong(value, &ret))
401 die_bad_config(name);
402 return ret;
403 }
405 static int git_config_maybe_bool_text(const char *name, const char *value)
406 {
407 if (!value)
408 return 1;
409 if (!*value)
410 return 0;
411 if (!strcasecmp(value, "true")
412 || !strcasecmp(value, "yes")
413 || !strcasecmp(value, "on"))
414 return 1;
415 if (!strcasecmp(value, "false")
416 || !strcasecmp(value, "no")
417 || !strcasecmp(value, "off"))
418 return 0;
419 return -1;
420 }
422 int git_config_maybe_bool(const char *name, const char *value)
423 {
424 long v = git_config_maybe_bool_text(name, value);
425 if (0 <= v)
426 return v;
427 if (git_parse_long(value, &v))
428 return !!v;
429 return -1;
430 }
432 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
433 {
434 int v = git_config_maybe_bool_text(name, value);
435 if (0 <= v) {
436 *is_bool = 1;
437 return v;
438 }
439 *is_bool = 0;
440 return git_config_int(name, value);
441 }
443 int git_config_bool(const char *name, const char *value)
444 {
445 int discard;
446 return !!git_config_bool_or_int(name, value, &discard);
447 }
449 int git_config_string(const char **dest, const char *var, const char *value)
450 {
451 if (!value)
452 return config_error_nonbool(var);
453 *dest = xstrdup(value);
454 return 0;
455 }
457 int git_config_pathname(const char **dest, const char *var, const char *value)
458 {
459 if (!value)
460 return config_error_nonbool(var);
461 *dest = expand_user_path(value);
462 if (!*dest)
463 die("Failed to expand user dir in: '%s'", value);
464 return 0;
465 }
467 static int git_default_core_config(const char *var, const char *value)
468 {
469 /* This needs a better name */
470 if (!strcmp(var, "core.filemode")) {
471 trust_executable_bit = git_config_bool(var, value);
472 return 0;
473 }
474 if (!strcmp(var, "core.trustctime")) {
475 trust_ctime = git_config_bool(var, value);
476 return 0;
477 }
479 if (!strcmp(var, "core.quotepath")) {
480 quote_path_fully = git_config_bool(var, value);
481 return 0;
482 }
484 if (!strcmp(var, "core.symlinks")) {
485 has_symlinks = git_config_bool(var, value);
486 return 0;
487 }
489 if (!strcmp(var, "core.ignorecase")) {
490 ignore_case = git_config_bool(var, value);
491 return 0;
492 }
494 if (!strcmp(var, "core.attributesfile"))
495 return git_config_pathname(&git_attributes_file, var, value);
497 if (!strcmp(var, "core.bare")) {
498 is_bare_repository_cfg = git_config_bool(var, value);
499 return 0;
500 }
502 if (!strcmp(var, "core.ignorestat")) {
503 assume_unchanged = git_config_bool(var, value);
504 return 0;
505 }
507 if (!strcmp(var, "core.prefersymlinkrefs")) {
508 prefer_symlink_refs = git_config_bool(var, value);
509 return 0;
510 }
512 if (!strcmp(var, "core.logallrefupdates")) {
513 log_all_ref_updates = git_config_bool(var, value);
514 return 0;
515 }
517 if (!strcmp(var, "core.warnambiguousrefs")) {
518 warn_ambiguous_refs = git_config_bool(var, value);
519 return 0;
520 }
522 if (!strcmp(var, "core.abbrev")) {
523 int abbrev = git_config_int(var, value);
524 if (abbrev < minimum_abbrev || abbrev > 40)
525 return -1;
526 default_abbrev = abbrev;
527 return 0;
528 }
530 if (!strcmp(var, "core.loosecompression")) {
531 int level = git_config_int(var, value);
532 if (level == -1)
533 level = Z_DEFAULT_COMPRESSION;
534 else if (level < 0 || level > Z_BEST_COMPRESSION)
535 die("bad zlib compression level %d", level);
536 zlib_compression_level = level;
537 zlib_compression_seen = 1;
538 return 0;
539 }
541 if (!strcmp(var, "core.compression")) {
542 int level = git_config_int(var, value);
543 if (level == -1)
544 level = Z_DEFAULT_COMPRESSION;
545 else if (level < 0 || level > Z_BEST_COMPRESSION)
546 die("bad zlib compression level %d", level);
547 core_compression_level = level;
548 core_compression_seen = 1;
549 if (!zlib_compression_seen)
550 zlib_compression_level = level;
551 return 0;
552 }
554 if (!strcmp(var, "core.packedgitwindowsize")) {
555 int pgsz_x2 = getpagesize() * 2;
556 packed_git_window_size = git_config_int(var, value);
558 /* This value must be multiple of (pagesize * 2) */
559 packed_git_window_size /= pgsz_x2;
560 if (packed_git_window_size < 1)
561 packed_git_window_size = 1;
562 packed_git_window_size *= pgsz_x2;
563 return 0;
564 }
566 if (!strcmp(var, "core.bigfilethreshold")) {
567 long n = git_config_int(var, value);
568 big_file_threshold = 0 < n ? n : 0;
569 return 0;
570 }
572 if (!strcmp(var, "core.packedgitlimit")) {
573 packed_git_limit = git_config_int(var, value);
574 return 0;
575 }
577 if (!strcmp(var, "core.deltabasecachelimit")) {
578 delta_base_cache_limit = git_config_int(var, value);
579 return 0;
580 }
582 if (!strcmp(var, "core.logpackaccess"))
583 return git_config_string(&log_pack_access, var, value);
585 if (!strcmp(var, "core.autocrlf")) {
586 if (value && !strcasecmp(value, "input")) {
587 if (core_eol == EOL_CRLF)
588 return error("core.autocrlf=input conflicts with core.eol=crlf");
589 auto_crlf = AUTO_CRLF_INPUT;
590 return 0;
591 }
592 auto_crlf = git_config_bool(var, value);
593 return 0;
594 }
596 if (!strcmp(var, "core.safecrlf")) {
597 if (value && !strcasecmp(value, "warn")) {
598 safe_crlf = SAFE_CRLF_WARN;
599 return 0;
600 }
601 safe_crlf = git_config_bool(var, value);
602 return 0;
603 }
605 if (!strcmp(var, "core.eol")) {
606 if (value && !strcasecmp(value, "lf"))
607 core_eol = EOL_LF;
608 else if (value && !strcasecmp(value, "crlf"))
609 core_eol = EOL_CRLF;
610 else if (value && !strcasecmp(value, "native"))
611 core_eol = EOL_NATIVE;
612 else
613 core_eol = EOL_UNSET;
614 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
615 return error("core.autocrlf=input conflicts with core.eol=crlf");
616 return 0;
617 }
619 if (!strcmp(var, "core.notesref")) {
620 notes_ref_name = xstrdup(value);
621 return 0;
622 }
624 if (!strcmp(var, "core.pager"))
625 return git_config_string(&pager_program, var, value);
627 if (!strcmp(var, "core.editor"))
628 return git_config_string(&editor_program, var, value);
630 if (!strcmp(var, "core.askpass"))
631 return git_config_string(&askpass_program, var, value);
633 if (!strcmp(var, "core.excludesfile"))
634 return git_config_pathname(&excludes_file, var, value);
636 if (!strcmp(var, "core.whitespace")) {
637 if (!value)
638 return config_error_nonbool(var);
639 whitespace_rule_cfg = parse_whitespace_rule(value);
640 return 0;
641 }
643 if (!strcmp(var, "core.fsyncobjectfiles")) {
644 fsync_object_files = git_config_bool(var, value);
645 return 0;
646 }
648 if (!strcmp(var, "core.preloadindex")) {
649 core_preload_index = git_config_bool(var, value);
650 return 0;
651 }
653 if (!strcmp(var, "core.createobject")) {
654 if (!strcmp(value, "rename"))
655 object_creation_mode = OBJECT_CREATION_USES_RENAMES;
656 else if (!strcmp(value, "link"))
657 object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
658 else
659 die("Invalid mode for object creation: %s", value);
660 return 0;
661 }
663 if (!strcmp(var, "core.sparsecheckout")) {
664 core_apply_sparse_checkout = git_config_bool(var, value);
665 return 0;
666 }
668 /* Add other config variables here and to Documentation/config.txt. */
669 return 0;
670 }
672 static int git_default_user_config(const char *var, const char *value)
673 {
674 if (!strcmp(var, "user.name")) {
675 if (!value)
676 return config_error_nonbool(var);
677 strlcpy(git_default_name, value, sizeof(git_default_name));
678 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
679 return 0;
680 }
682 if (!strcmp(var, "user.email")) {
683 if (!value)
684 return config_error_nonbool(var);
685 strlcpy(git_default_email, value, sizeof(git_default_email));
686 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
687 return 0;
688 }
690 /* Add other config variables here and to Documentation/config.txt. */
691 return 0;
692 }
694 static int git_default_i18n_config(const char *var, const char *value)
695 {
696 if (!strcmp(var, "i18n.commitencoding"))
697 return git_config_string(&git_commit_encoding, var, value);
699 if (!strcmp(var, "i18n.logoutputencoding"))
700 return git_config_string(&git_log_output_encoding, var, value);
702 /* Add other config variables here and to Documentation/config.txt. */
703 return 0;
704 }
706 static int git_default_branch_config(const char *var, const char *value)
707 {
708 if (!strcmp(var, "branch.autosetupmerge")) {
709 if (value && !strcasecmp(value, "always")) {
710 git_branch_track = BRANCH_TRACK_ALWAYS;
711 return 0;
712 }
713 git_branch_track = git_config_bool(var, value);
714 return 0;
715 }
716 if (!strcmp(var, "branch.autosetuprebase")) {
717 if (!value)
718 return config_error_nonbool(var);
719 else if (!strcmp(value, "never"))
720 autorebase = AUTOREBASE_NEVER;
721 else if (!strcmp(value, "local"))
722 autorebase = AUTOREBASE_LOCAL;
723 else if (!strcmp(value, "remote"))
724 autorebase = AUTOREBASE_REMOTE;
725 else if (!strcmp(value, "always"))
726 autorebase = AUTOREBASE_ALWAYS;
727 else
728 return error("Malformed value for %s", var);
729 return 0;
730 }
732 /* Add other config variables here and to Documentation/config.txt. */
733 return 0;
734 }
736 static int git_default_push_config(const char *var, const char *value)
737 {
738 if (!strcmp(var, "push.default")) {
739 if (!value)
740 return config_error_nonbool(var);
741 else if (!strcmp(value, "nothing"))
742 push_default = PUSH_DEFAULT_NOTHING;
743 else if (!strcmp(value, "matching"))
744 push_default = PUSH_DEFAULT_MATCHING;
745 else if (!strcmp(value, "upstream"))
746 push_default = PUSH_DEFAULT_UPSTREAM;
747 else if (!strcmp(value, "tracking")) /* deprecated */
748 push_default = PUSH_DEFAULT_UPSTREAM;
749 else if (!strcmp(value, "current"))
750 push_default = PUSH_DEFAULT_CURRENT;
751 else {
752 error("Malformed value for %s: %s", var, value);
753 return error("Must be one of nothing, matching, "
754 "tracking or current.");
755 }
756 return 0;
757 }
759 /* Add other config variables here and to Documentation/config.txt. */
760 return 0;
761 }
763 static int git_default_mailmap_config(const char *var, const char *value)
764 {
765 if (!strcmp(var, "mailmap.file"))
766 return git_config_string(&git_mailmap_file, var, value);
768 /* Add other config variables here and to Documentation/config.txt. */
769 return 0;
770 }
772 int git_default_config(const char *var, const char *value, void *dummy)
773 {
774 if (!prefixcmp(var, "core."))
775 return git_default_core_config(var, value);
777 if (!prefixcmp(var, "user."))
778 return git_default_user_config(var, value);
780 if (!prefixcmp(var, "i18n."))
781 return git_default_i18n_config(var, value);
783 if (!prefixcmp(var, "branch."))
784 return git_default_branch_config(var, value);
786 if (!prefixcmp(var, "push."))
787 return git_default_push_config(var, value);
789 if (!prefixcmp(var, "mailmap."))
790 return git_default_mailmap_config(var, value);
792 if (!prefixcmp(var, "advice."))
793 return git_default_advice_config(var, value);
795 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
796 pager_use_color = git_config_bool(var,value);
797 return 0;
798 }
800 /* Add other config variables here and to Documentation/config.txt. */
801 return 0;
802 }
804 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
805 {
806 int ret;
807 FILE *f = fopen(filename, "r");
809 ret = -1;
810 if (f) {
811 config_file top;
813 /* push config-file parsing state stack */
814 top.prev = cf;
815 top.f = f;
816 top.name = filename;
817 top.linenr = 1;
818 top.eof = 0;
819 strbuf_init(&top.value, 1024);
820 cf = ⊤
822 ret = git_parse_file(fn, data);
824 /* pop config-file parsing state stack */
825 strbuf_release(&top.value);
826 cf = top.prev;
828 fclose(f);
829 }
830 return ret;
831 }
833 const char *git_etc_gitconfig(void)
834 {
835 static const char *system_wide;
836 if (!system_wide)
837 system_wide = system_path(ETC_GITCONFIG);
838 return system_wide;
839 }
841 int git_env_bool(const char *k, int def)
842 {
843 const char *v = getenv(k);
844 return v ? git_config_bool(k, v) : def;
845 }
847 int git_config_system(void)
848 {
849 return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
850 }
852 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
853 {
854 int ret = 0, found = 0;
855 const char *home = NULL;
857 /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
858 if (config_exclusive_filename)
859 return git_config_from_file(fn, config_exclusive_filename, data);
860 if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
861 ret += git_config_from_file(fn, git_etc_gitconfig(),
862 data);
863 found += 1;
864 }
866 home = getenv("HOME");
867 if (home) {
868 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
869 if (!access(user_config, R_OK)) {
870 ret += git_config_from_file(fn, user_config, data);
871 found += 1;
872 }
873 free(user_config);
874 }
876 if (repo_config && !access(repo_config, R_OK)) {
877 ret += git_config_from_file(fn, repo_config, data);
878 found += 1;
879 }
881 switch (git_config_from_parameters(fn, data)) {
882 case -1: /* error */
883 die("unable to parse command-line config");
884 break;
885 case 0: /* found nothing */
886 break;
887 default: /* found at least one item */
888 found++;
889 break;
890 }
892 return ret == 0 ? found : ret;
893 }
895 int git_config(config_fn_t fn, void *data)
896 {
897 char *repo_config = NULL;
898 int ret;
900 repo_config = git_pathdup("config");
901 ret = git_config_early(fn, data, repo_config);
902 if (repo_config)
903 free(repo_config);
904 return ret;
905 }
907 /*
908 * Find all the stuff for git_config_set() below.
909 */
911 #define MAX_MATCHES 512
913 static struct {
914 int baselen;
915 char *key;
916 int do_not_match;
917 regex_t *value_regex;
918 int multi_replace;
919 size_t offset[MAX_MATCHES];
920 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
921 int seen;
922 } store;
924 static int matches(const char *key, const char *value)
925 {
926 return !strcmp(key, store.key) &&
927 (store.value_regex == NULL ||
928 (store.do_not_match ^
929 !regexec(store.value_regex, value, 0, NULL, 0)));
930 }
932 static int store_aux(const char *key, const char *value, void *cb)
933 {
934 const char *ep;
935 size_t section_len;
936 FILE *f = cf->f;
938 switch (store.state) {
939 case KEY_SEEN:
940 if (matches(key, value)) {
941 if (store.seen == 1 && store.multi_replace == 0) {
942 warning("%s has multiple values", key);
943 } else if (store.seen >= MAX_MATCHES) {
944 error("too many matches for %s", key);
945 return 1;
946 }
948 store.offset[store.seen] = ftell(f);
949 store.seen++;
950 }
951 break;
952 case SECTION_SEEN:
953 /*
954 * What we are looking for is in store.key (both
955 * section and var), and its section part is baselen
956 * long. We found key (again, both section and var).
957 * We would want to know if this key is in the same
958 * section as what we are looking for. We already
959 * know we are in the same section as what should
960 * hold store.key.
961 */
962 ep = strrchr(key, '.');
963 section_len = ep - key;
965 if ((section_len != store.baselen) ||
966 memcmp(key, store.key, section_len+1)) {
967 store.state = SECTION_END_SEEN;
968 break;
969 }
971 /*
972 * Do not increment matches: this is no match, but we
973 * just made sure we are in the desired section.
974 */
975 store.offset[store.seen] = ftell(f);
976 /* fallthru */
977 case SECTION_END_SEEN:
978 case START:
979 if (matches(key, value)) {
980 store.offset[store.seen] = ftell(f);
981 store.state = KEY_SEEN;
982 store.seen++;
983 } else {
984 if (strrchr(key, '.') - key == store.baselen &&
985 !strncmp(key, store.key, store.baselen)) {
986 store.state = SECTION_SEEN;
987 store.offset[store.seen] = ftell(f);
988 }
989 }
990 }
991 return 0;
992 }
994 static int write_error(const char *filename)
995 {
996 error("failed to write new configuration file %s", filename);
998 /* Same error code as "failed to rename". */
999 return 4;
1000 }
1002 static int store_write_section(int fd, const char *key)
1003 {
1004 const char *dot;
1005 int i, success;
1006 struct strbuf sb = STRBUF_INIT;
1008 dot = memchr(key, '.', store.baselen);
1009 if (dot) {
1010 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1011 for (i = dot - key + 1; i < store.baselen; i++) {
1012 if (key[i] == '"' || key[i] == '\\')
1013 strbuf_addch(&sb, '\\');
1014 strbuf_addch(&sb, key[i]);
1015 }
1016 strbuf_addstr(&sb, "\"]\n");
1017 } else {
1018 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1019 }
1021 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1022 strbuf_release(&sb);
1024 return success;
1025 }
1027 static int store_write_pair(int fd, const char *key, const char *value)
1028 {
1029 int i, success;
1030 int length = strlen(key + store.baselen + 1);
1031 const char *quote = "";
1032 struct strbuf sb = STRBUF_INIT;
1034 /*
1035 * Check to see if the value needs to be surrounded with a dq pair.
1036 * Note that problematic characters are always backslash-quoted; this
1037 * check is about not losing leading or trailing SP and strings that
1038 * follow beginning-of-comment characters (i.e. ';' and '#') by the
1039 * configuration parser.
1040 */
1041 if (value[0] == ' ')
1042 quote = "\"";
1043 for (i = 0; value[i]; i++)
1044 if (value[i] == ';' || value[i] == '#')
1045 quote = "\"";
1046 if (i && value[i - 1] == ' ')
1047 quote = "\"";
1049 strbuf_addf(&sb, "\t%.*s = %s",
1050 length, key + store.baselen + 1, quote);
1052 for (i = 0; value[i]; i++)
1053 switch (value[i]) {
1054 case '\n':
1055 strbuf_addstr(&sb, "\\n");
1056 break;
1057 case '\t':
1058 strbuf_addstr(&sb, "\\t");
1059 break;
1060 case '"':
1061 case '\\':
1062 strbuf_addch(&sb, '\\');
1063 default:
1064 strbuf_addch(&sb, value[i]);
1065 break;
1066 }
1067 strbuf_addf(&sb, "%s\n", quote);
1069 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1070 strbuf_release(&sb);
1072 return success;
1073 }
1075 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1076 size_t offset_, int *found_bracket)
1077 {
1078 size_t equal_offset = size, bracket_offset = size;
1079 ssize_t offset;
1081 contline:
1082 for (offset = offset_-2; offset > 0
1083 && contents[offset] != '\n'; offset--)
1084 switch (contents[offset]) {
1085 case '=': equal_offset = offset; break;
1086 case ']': bracket_offset = offset; break;
1087 }
1088 if (offset > 0 && contents[offset-1] == '\\') {
1089 offset_ = offset;
1090 goto contline;
1091 }
1092 if (bracket_offset < equal_offset) {
1093 *found_bracket = 1;
1094 offset = bracket_offset+1;
1095 } else
1096 offset++;
1098 return offset;
1099 }
1101 int git_config_set_in_file(const char *config_filename,
1102 const char *key, const char *value)
1103 {
1104 return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1105 }
1107 int git_config_set(const char *key, const char *value)
1108 {
1109 return git_config_set_multivar(key, value, NULL, 0);
1110 }
1112 /*
1113 * Auxiliary function to sanity-check and split the key into the section
1114 * identifier and variable name.
1115 *
1116 * Returns 0 on success, -1 when there is an invalid character in the key and
1117 * -2 if there is no section name in the key.
1118 *
1119 * store_key - pointer to char* which will hold a copy of the key with
1120 * lowercase section and variable name
1121 * baselen - pointer to int which will hold the length of the
1122 * section + subsection part, can be NULL
1123 */
1124 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1125 {
1126 int i, dot, baselen;
1127 const char *last_dot = strrchr(key, '.');
1129 /*
1130 * Since "key" actually contains the section name and the real
1131 * key name separated by a dot, we have to know where the dot is.
1132 */
1134 if (last_dot == NULL || last_dot == key) {
1135 error("key does not contain a section: %s", key);
1136 return -CONFIG_NO_SECTION_OR_NAME;
1137 }
1139 if (!last_dot[1]) {
1140 error("key does not contain variable name: %s", key);
1141 return -CONFIG_NO_SECTION_OR_NAME;
1142 }
1144 baselen = last_dot - key;
1145 if (baselen_)
1146 *baselen_ = baselen;
1148 /*
1149 * Validate the key and while at it, lower case it for matching.
1150 */
1151 *store_key = xmalloc(strlen(key) + 1);
1153 dot = 0;
1154 for (i = 0; key[i]; i++) {
1155 unsigned char c = key[i];
1156 if (c == '.')
1157 dot = 1;
1158 /* Leave the extended basename untouched.. */
1159 if (!dot || i > baselen) {
1160 if (!iskeychar(c) ||
1161 (i == baselen + 1 && !isalpha(c))) {
1162 error("invalid key: %s", key);
1163 goto out_free_ret_1;
1164 }
1165 c = tolower(c);
1166 } else if (c == '\n') {
1167 error("invalid key (newline): %s", key);
1168 goto out_free_ret_1;
1169 }
1170 (*store_key)[i] = c;
1171 }
1172 (*store_key)[i] = 0;
1174 return 0;
1176 out_free_ret_1:
1177 free(*store_key);
1178 return -CONFIG_INVALID_KEY;
1179 }
1181 /*
1182 * If value==NULL, unset in (remove from) config,
1183 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1184 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1185 * else all matching key/values (regardless how many) are removed,
1186 * before the new pair is written.
1187 *
1188 * Returns 0 on success.
1189 *
1190 * This function does this:
1191 *
1192 * - it locks the config file by creating ".git/config.lock"
1193 *
1194 * - it then parses the config using store_aux() as validator to find
1195 * the position on the key/value pair to replace. If it is to be unset,
1196 * it must be found exactly once.
1197 *
1198 * - the config file is mmap()ed and the part before the match (if any) is
1199 * written to the lock file, then the changed part and the rest.
1200 *
1201 * - the config file is removed and the lock file rename()d to it.
1202 *
1203 */
1204 int git_config_set_multivar_in_file(const char *config_filename,
1205 const char *key, const char *value,
1206 const char *value_regex, int multi_replace)
1207 {
1208 int fd = -1, in_fd;
1209 int ret;
1210 struct lock_file *lock = NULL;
1212 /* parse-key returns negative; flip the sign to feed exit(3) */
1213 ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1214 if (ret)
1215 goto out_free;
1217 store.multi_replace = multi_replace;
1220 /*
1221 * The lock serves a purpose in addition to locking: the new
1222 * contents of .git/config will be written into it.
1223 */
1224 lock = xcalloc(sizeof(struct lock_file), 1);
1225 fd = hold_lock_file_for_update(lock, config_filename, 0);
1226 if (fd < 0) {
1227 error("could not lock config file %s: %s", config_filename, strerror(errno));
1228 free(store.key);
1229 ret = CONFIG_NO_LOCK;
1230 goto out_free;
1231 }
1233 /*
1234 * If .git/config does not exist yet, write a minimal version.
1235 */
1236 in_fd = open(config_filename, O_RDONLY);
1237 if ( in_fd < 0 ) {
1238 free(store.key);
1240 if ( ENOENT != errno ) {
1241 error("opening %s: %s", config_filename,
1242 strerror(errno));
1243 ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1244 goto out_free;
1245 }
1246 /* if nothing to unset, error out */
1247 if (value == NULL) {
1248 ret = CONFIG_NOTHING_SET;
1249 goto out_free;
1250 }
1252 store.key = (char *)key;
1253 if (!store_write_section(fd, key) ||
1254 !store_write_pair(fd, key, value))
1255 goto write_err_out;
1256 } else {
1257 struct stat st;
1258 char *contents;
1259 size_t contents_sz, copy_begin, copy_end;
1260 int i, new_line = 0;
1262 if (value_regex == NULL)
1263 store.value_regex = NULL;
1264 else {
1265 if (value_regex[0] == '!') {
1266 store.do_not_match = 1;
1267 value_regex++;
1268 } else
1269 store.do_not_match = 0;
1271 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1272 if (regcomp(store.value_regex, value_regex,
1273 REG_EXTENDED)) {
1274 error("invalid pattern: %s", value_regex);
1275 free(store.value_regex);
1276 ret = CONFIG_INVALID_PATTERN;
1277 goto out_free;
1278 }
1279 }
1281 store.offset[0] = 0;
1282 store.state = START;
1283 store.seen = 0;
1285 /*
1286 * After this, store.offset will contain the *end* offset
1287 * of the last match, or remain at 0 if no match was found.
1288 * As a side effect, we make sure to transform only a valid
1289 * existing config file.
1290 */
1291 if (git_config_from_file(store_aux, config_filename, NULL)) {
1292 error("invalid config file %s", config_filename);
1293 free(store.key);
1294 if (store.value_regex != NULL) {
1295 regfree(store.value_regex);
1296 free(store.value_regex);
1297 }
1298 ret = CONFIG_INVALID_FILE;
1299 goto out_free;
1300 }
1302 free(store.key);
1303 if (store.value_regex != NULL) {
1304 regfree(store.value_regex);
1305 free(store.value_regex);
1306 }
1308 /* if nothing to unset, or too many matches, error out */
1309 if ((store.seen == 0 && value == NULL) ||
1310 (store.seen > 1 && multi_replace == 0)) {
1311 ret = CONFIG_NOTHING_SET;
1312 goto out_free;
1313 }
1315 fstat(in_fd, &st);
1316 contents_sz = xsize_t(st.st_size);
1317 contents = xmmap(NULL, contents_sz, PROT_READ,
1318 MAP_PRIVATE, in_fd, 0);
1319 close(in_fd);
1321 if (store.seen == 0)
1322 store.seen = 1;
1324 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1325 if (store.offset[i] == 0) {
1326 store.offset[i] = copy_end = contents_sz;
1327 } else if (store.state != KEY_SEEN) {
1328 copy_end = store.offset[i];
1329 } else
1330 copy_end = find_beginning_of_line(
1331 contents, contents_sz,
1332 store.offset[i]-2, &new_line);
1334 if (copy_end > 0 && contents[copy_end-1] != '\n')
1335 new_line = 1;
1337 /* write the first part of the config */
1338 if (copy_end > copy_begin) {
1339 if (write_in_full(fd, contents + copy_begin,
1340 copy_end - copy_begin) <
1341 copy_end - copy_begin)
1342 goto write_err_out;
1343 if (new_line &&
1344 write_str_in_full(fd, "\n") != 1)
1345 goto write_err_out;
1346 }
1347 copy_begin = store.offset[i];
1348 }
1350 /* write the pair (value == NULL means unset) */
1351 if (value != NULL) {
1352 if (store.state == START) {
1353 if (!store_write_section(fd, key))
1354 goto write_err_out;
1355 }
1356 if (!store_write_pair(fd, key, value))
1357 goto write_err_out;
1358 }
1360 /* write the rest of the config */
1361 if (copy_begin < contents_sz)
1362 if (write_in_full(fd, contents + copy_begin,
1363 contents_sz - copy_begin) <
1364 contents_sz - copy_begin)
1365 goto write_err_out;
1367 munmap(contents, contents_sz);
1368 }
1370 if (commit_lock_file(lock) < 0) {
1371 error("could not commit config file %s", config_filename);
1372 ret = CONFIG_NO_WRITE;
1373 goto out_free;
1374 }
1376 /*
1377 * lock is committed, so don't try to roll it back below.
1378 * NOTE: Since lockfile.c keeps a linked list of all created
1379 * lock_file structures, it isn't safe to free(lock). It's
1380 * better to just leave it hanging around.
1381 */
1382 lock = NULL;
1383 ret = 0;
1385 out_free:
1386 if (lock)
1387 rollback_lock_file(lock);
1388 return ret;
1390 write_err_out:
1391 ret = write_error(lock->filename);
1392 goto out_free;
1394 }
1396 int git_config_set_multivar(const char *key, const char *value,
1397 const char *value_regex, int multi_replace)
1398 {
1399 const char *config_filename;
1400 char *buf = NULL;
1401 int ret;
1403 if (config_exclusive_filename)
1404 config_filename = config_exclusive_filename;
1405 else
1406 config_filename = buf = git_pathdup("config");
1408 ret = git_config_set_multivar_in_file(config_filename, key, value,
1409 value_regex, multi_replace);
1410 free(buf);
1411 return ret;
1412 }
1414 static int section_name_match (const char *buf, const char *name)
1415 {
1416 int i = 0, j = 0, dot = 0;
1417 if (buf[i] != '[')
1418 return 0;
1419 for (i = 1; buf[i] && buf[i] != ']'; i++) {
1420 if (!dot && isspace(buf[i])) {
1421 dot = 1;
1422 if (name[j++] != '.')
1423 break;
1424 for (i++; isspace(buf[i]); i++)
1425 ; /* do nothing */
1426 if (buf[i] != '"')
1427 break;
1428 continue;
1429 }
1430 if (buf[i] == '\\' && dot)
1431 i++;
1432 else if (buf[i] == '"' && dot) {
1433 for (i++; isspace(buf[i]); i++)
1434 ; /* do_nothing */
1435 break;
1436 }
1437 if (buf[i] != name[j++])
1438 break;
1439 }
1440 if (buf[i] == ']' && name[j] == 0) {
1441 /*
1442 * We match, now just find the right length offset by
1443 * gobbling up any whitespace after it, as well
1444 */
1445 i++;
1446 for (; buf[i] && isspace(buf[i]); i++)
1447 ; /* do nothing */
1448 return i;
1449 }
1450 return 0;
1451 }
1453 /* if new_name == NULL, the section is removed instead */
1454 int git_config_rename_section(const char *old_name, const char *new_name)
1455 {
1456 int ret = 0, remove = 0;
1457 char *config_filename;
1458 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1459 int out_fd;
1460 char buf[1024];
1461 FILE *config_file;
1463 if (config_exclusive_filename)
1464 config_filename = xstrdup(config_exclusive_filename);
1465 else
1466 config_filename = git_pathdup("config");
1467 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1468 if (out_fd < 0) {
1469 ret = error("could not lock config file %s", config_filename);
1470 goto out;
1471 }
1473 if (!(config_file = fopen(config_filename, "rb"))) {
1474 /* no config file means nothing to rename, no error */
1475 goto unlock_and_out;
1476 }
1478 while (fgets(buf, sizeof(buf), config_file)) {
1479 int i;
1480 int length;
1481 char *output = buf;
1482 for (i = 0; buf[i] && isspace(buf[i]); i++)
1483 ; /* do nothing */
1484 if (buf[i] == '[') {
1485 /* it's a section */
1486 int offset = section_name_match(&buf[i], old_name);
1487 if (offset > 0) {
1488 ret++;
1489 if (new_name == NULL) {
1490 remove = 1;
1491 continue;
1492 }
1493 store.baselen = strlen(new_name);
1494 if (!store_write_section(out_fd, new_name)) {
1495 ret = write_error(lock->filename);
1496 goto out;
1497 }
1498 /*
1499 * We wrote out the new section, with
1500 * a newline, now skip the old
1501 * section's length
1502 */
1503 output += offset + i;
1504 if (strlen(output) > 0) {
1505 /*
1506 * More content means there's
1507 * a declaration to put on the
1508 * next line; indent with a
1509 * tab
1510 */
1511 output -= 1;
1512 output[0] = '\t';
1513 }
1514 }
1515 remove = 0;
1516 }
1517 if (remove)
1518 continue;
1519 length = strlen(output);
1520 if (write_in_full(out_fd, output, length) != length) {
1521 ret = write_error(lock->filename);
1522 goto out;
1523 }
1524 }
1525 fclose(config_file);
1526 unlock_and_out:
1527 if (commit_lock_file(lock) < 0)
1528 ret = error("could not commit config file %s", config_filename);
1529 out:
1530 free(config_filename);
1531 return ret;
1532 }
1534 /*
1535 * Call this to report error for your variable that should not
1536 * get a boolean value (i.e. "[my] var" means "true").
1537 */
1538 int config_error_nonbool(const char *var)
1539 {
1540 return error("Missing value for '%s'", var);
1541 }