lockfile.h: extract new header file for the functions in lockfile.c
[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 "lockfile.h"
10 #include "exec_cmd.h"
11 #include "strbuf.h"
12 #include "quote.h"
13 #include "hashmap.h"
14 #include "string-list.h"
15
16 struct config_source {
17 struct config_source *prev;
18 union {
19 FILE *file;
20 struct config_buf {
21 const char *buf;
22 size_t len;
23 size_t pos;
24 } buf;
25 } u;
26 const char *name;
27 const char *path;
28 int die_on_error;
29 int linenr;
30 int eof;
31 struct strbuf value;
32 struct strbuf var;
33
34 int (*do_fgetc)(struct config_source *c);
35 int (*do_ungetc)(int c, struct config_source *conf);
36 long (*do_ftell)(struct config_source *c);
37 };
38
39 static struct config_source *cf;
40
41 static int zlib_compression_seen;
42
43 /*
44 * Default config_set that contains key-value pairs from the usual set of config
45 * config files (i.e repo specific .git/config, user wide ~/.gitconfig, XDG
46 * config file and the global /etc/gitconfig)
47 */
48 static struct config_set the_config_set;
49
50 static int config_file_fgetc(struct config_source *conf)
51 {
52 return fgetc(conf->u.file);
53 }
54
55 static int config_file_ungetc(int c, struct config_source *conf)
56 {
57 return ungetc(c, conf->u.file);
58 }
59
60 static long config_file_ftell(struct config_source *conf)
61 {
62 return ftell(conf->u.file);
63 }
64
65
66 static int config_buf_fgetc(struct config_source *conf)
67 {
68 if (conf->u.buf.pos < conf->u.buf.len)
69 return conf->u.buf.buf[conf->u.buf.pos++];
70
71 return EOF;
72 }
73
74 static int config_buf_ungetc(int c, struct config_source *conf)
75 {
76 if (conf->u.buf.pos > 0)
77 return conf->u.buf.buf[--conf->u.buf.pos];
78
79 return EOF;
80 }
81
82 static long config_buf_ftell(struct config_source *conf)
83 {
84 return conf->u.buf.pos;
85 }
86
87 #define MAX_INCLUDE_DEPTH 10
88 static const char include_depth_advice[] =
89 "exceeded maximum include depth (%d) while including\n"
90 " %s\n"
91 "from\n"
92 " %s\n"
93 "Do you have circular includes?";
94 static int handle_path_include(const char *path, struct config_include_data *inc)
95 {
96 int ret = 0;
97 struct strbuf buf = STRBUF_INIT;
98 char *expanded;
99
100 if (!path)
101 return config_error_nonbool("include.path");
102
103 expanded = expand_user_path(path);
104 if (!expanded)
105 return error("Could not expand include path '%s'", path);
106 path = expanded;
107
108 /*
109 * Use an absolute path as-is, but interpret relative paths
110 * based on the including config file.
111 */
112 if (!is_absolute_path(path)) {
113 char *slash;
114
115 if (!cf || !cf->path)
116 return error("relative config includes must come from files");
117
118 slash = find_last_dir_sep(cf->path);
119 if (slash)
120 strbuf_add(&buf, cf->path, slash - cf->path + 1);
121 strbuf_addstr(&buf, path);
122 path = buf.buf;
123 }
124
125 if (!access_or_die(path, R_OK, 0)) {
126 if (++inc->depth > MAX_INCLUDE_DEPTH)
127 die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
128 cf && cf->name ? cf->name : "the command line");
129 ret = git_config_from_file(git_config_include, path, inc);
130 inc->depth--;
131 }
132 strbuf_release(&buf);
133 free(expanded);
134 return ret;
135 }
136
137 int git_config_include(const char *var, const char *value, void *data)
138 {
139 struct config_include_data *inc = data;
140 int ret;
141
142 /*
143 * Pass along all values, including "include" directives; this makes it
144 * possible to query information on the includes themselves.
145 */
146 ret = inc->fn(var, value, inc->data);
147 if (ret < 0)
148 return ret;
149
150 if (!strcmp(var, "include.path"))
151 ret = handle_path_include(value, inc);
152 return ret;
153 }
154
155 void git_config_push_parameter(const char *text)
156 {
157 struct strbuf env = STRBUF_INIT;
158 const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
159 if (old) {
160 strbuf_addstr(&env, old);
161 strbuf_addch(&env, ' ');
162 }
163 sq_quote_buf(&env, text);
164 setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
165 strbuf_release(&env);
166 }
167
168 int git_config_parse_parameter(const char *text,
169 config_fn_t fn, void *data)
170 {
171 const char *value;
172 struct strbuf **pair;
173
174 pair = strbuf_split_str(text, '=', 2);
175 if (!pair[0])
176 return error("bogus config parameter: %s", text);
177
178 if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {
179 strbuf_setlen(pair[0], pair[0]->len - 1);
180 value = pair[1] ? pair[1]->buf : "";
181 } else {
182 value = NULL;
183 }
184
185 strbuf_trim(pair[0]);
186 if (!pair[0]->len) {
187 strbuf_list_free(pair);
188 return error("bogus config parameter: %s", text);
189 }
190 strbuf_tolower(pair[0]);
191 if (fn(pair[0]->buf, value, data) < 0) {
192 strbuf_list_free(pair);
193 return -1;
194 }
195 strbuf_list_free(pair);
196 return 0;
197 }
198
199 int git_config_from_parameters(config_fn_t fn, void *data)
200 {
201 const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
202 char *envw;
203 const char **argv = NULL;
204 int nr = 0, alloc = 0;
205 int i;
206
207 if (!env)
208 return 0;
209 /* sq_dequote will write over it */
210 envw = xstrdup(env);
211
212 if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
213 free(envw);
214 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
215 }
216
217 for (i = 0; i < nr; i++) {
218 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
219 free(argv);
220 free(envw);
221 return -1;
222 }
223 }
224
225 free(argv);
226 free(envw);
227 return nr > 0;
228 }
229
230 static int get_next_char(void)
231 {
232 int c = cf->do_fgetc(cf);
233
234 if (c == '\r') {
235 /* DOS like systems */
236 c = cf->do_fgetc(cf);
237 if (c != '\n') {
238 cf->do_ungetc(c, cf);
239 c = '\r';
240 }
241 }
242 if (c == '\n')
243 cf->linenr++;
244 if (c == EOF) {
245 cf->eof = 1;
246 cf->linenr++;
247 c = '\n';
248 }
249 return c;
250 }
251
252 static char *parse_value(void)
253 {
254 int quote = 0, comment = 0, space = 0;
255
256 strbuf_reset(&cf->value);
257 for (;;) {
258 int c = get_next_char();
259 if (c == '\n') {
260 if (quote) {
261 cf->linenr--;
262 return NULL;
263 }
264 return cf->value.buf;
265 }
266 if (comment)
267 continue;
268 if (isspace(c) && !quote) {
269 if (cf->value.len)
270 space++;
271 continue;
272 }
273 if (!quote) {
274 if (c == ';' || c == '#') {
275 comment = 1;
276 continue;
277 }
278 }
279 for (; space; space--)
280 strbuf_addch(&cf->value, ' ');
281 if (c == '\\') {
282 c = get_next_char();
283 switch (c) {
284 case '\n':
285 continue;
286 case 't':
287 c = '\t';
288 break;
289 case 'b':
290 c = '\b';
291 break;
292 case 'n':
293 c = '\n';
294 break;
295 /* Some characters escape as themselves */
296 case '\\': case '"':
297 break;
298 /* Reject unknown escape sequences */
299 default:
300 return NULL;
301 }
302 strbuf_addch(&cf->value, c);
303 continue;
304 }
305 if (c == '"') {
306 quote = 1-quote;
307 continue;
308 }
309 strbuf_addch(&cf->value, c);
310 }
311 }
312
313 static inline int iskeychar(int c)
314 {
315 return isalnum(c) || c == '-';
316 }
317
318 static int get_value(config_fn_t fn, void *data, struct strbuf *name)
319 {
320 int c;
321 char *value;
322 int ret;
323
324 /* Get the full name */
325 for (;;) {
326 c = get_next_char();
327 if (cf->eof)
328 break;
329 if (!iskeychar(c))
330 break;
331 strbuf_addch(name, tolower(c));
332 }
333
334 while (c == ' ' || c == '\t')
335 c = get_next_char();
336
337 value = NULL;
338 if (c != '\n') {
339 if (c != '=')
340 return -1;
341 value = parse_value();
342 if (!value)
343 return -1;
344 }
345 /*
346 * We already consumed the \n, but we need linenr to point to
347 * the line we just parsed during the call to fn to get
348 * accurate line number in error messages.
349 */
350 cf->linenr--;
351 ret = fn(name->buf, value, data);
352 cf->linenr++;
353 return ret;
354 }
355
356 static int get_extended_base_var(struct strbuf *name, int c)
357 {
358 do {
359 if (c == '\n')
360 goto error_incomplete_line;
361 c = get_next_char();
362 } while (isspace(c));
363
364 /* We require the format to be '[base "extension"]' */
365 if (c != '"')
366 return -1;
367 strbuf_addch(name, '.');
368
369 for (;;) {
370 int c = get_next_char();
371 if (c == '\n')
372 goto error_incomplete_line;
373 if (c == '"')
374 break;
375 if (c == '\\') {
376 c = get_next_char();
377 if (c == '\n')
378 goto error_incomplete_line;
379 }
380 strbuf_addch(name, c);
381 }
382
383 /* Final ']' */
384 if (get_next_char() != ']')
385 return -1;
386 return 0;
387 error_incomplete_line:
388 cf->linenr--;
389 return -1;
390 }
391
392 static int get_base_var(struct strbuf *name)
393 {
394 for (;;) {
395 int c = get_next_char();
396 if (cf->eof)
397 return -1;
398 if (c == ']')
399 return 0;
400 if (isspace(c))
401 return get_extended_base_var(name, c);
402 if (!iskeychar(c) && c != '.')
403 return -1;
404 strbuf_addch(name, tolower(c));
405 }
406 }
407
408 static int git_parse_source(config_fn_t fn, void *data)
409 {
410 int comment = 0;
411 int baselen = 0;
412 struct strbuf *var = &cf->var;
413
414 /* U+FEFF Byte Order Mark in UTF8 */
415 static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
416 const unsigned char *bomptr = utf8_bom;
417
418 for (;;) {
419 int c = get_next_char();
420 if (bomptr && *bomptr) {
421 /* We are at the file beginning; skip UTF8-encoded BOM
422 * if present. Sane editors won't put this in on their
423 * own, but e.g. Windows Notepad will do it happily. */
424 if ((unsigned char) c == *bomptr) {
425 bomptr++;
426 continue;
427 } else {
428 /* Do not tolerate partial BOM. */
429 if (bomptr != utf8_bom)
430 break;
431 /* No BOM at file beginning. Cool. */
432 bomptr = NULL;
433 }
434 }
435 if (c == '\n') {
436 if (cf->eof)
437 return 0;
438 comment = 0;
439 continue;
440 }
441 if (comment || isspace(c))
442 continue;
443 if (c == '#' || c == ';') {
444 comment = 1;
445 continue;
446 }
447 if (c == '[') {
448 /* Reset prior to determining a new stem */
449 strbuf_reset(var);
450 if (get_base_var(var) < 0 || var->len < 1)
451 break;
452 strbuf_addch(var, '.');
453 baselen = var->len;
454 continue;
455 }
456 if (!isalpha(c))
457 break;
458 /*
459 * Truncate the var name back to the section header
460 * stem prior to grabbing the suffix part of the name
461 * and the value.
462 */
463 strbuf_setlen(var, baselen);
464 strbuf_addch(var, tolower(c));
465 if (get_value(fn, data, var) < 0)
466 break;
467 }
468 if (cf->die_on_error)
469 die(_("bad config file line %d in %s"), cf->linenr, cf->name);
470 else
471 return error(_("bad config file line %d in %s"), cf->linenr, cf->name);
472 }
473
474 static int parse_unit_factor(const char *end, uintmax_t *val)
475 {
476 if (!*end)
477 return 1;
478 else if (!strcasecmp(end, "k")) {
479 *val *= 1024;
480 return 1;
481 }
482 else if (!strcasecmp(end, "m")) {
483 *val *= 1024 * 1024;
484 return 1;
485 }
486 else if (!strcasecmp(end, "g")) {
487 *val *= 1024 * 1024 * 1024;
488 return 1;
489 }
490 return 0;
491 }
492
493 static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
494 {
495 if (value && *value) {
496 char *end;
497 intmax_t val;
498 uintmax_t uval;
499 uintmax_t factor = 1;
500
501 errno = 0;
502 val = strtoimax(value, &end, 0);
503 if (errno == ERANGE)
504 return 0;
505 if (!parse_unit_factor(end, &factor)) {
506 errno = EINVAL;
507 return 0;
508 }
509 uval = abs(val);
510 uval *= factor;
511 if (uval > max || abs(val) > uval) {
512 errno = ERANGE;
513 return 0;
514 }
515 val *= factor;
516 *ret = val;
517 return 1;
518 }
519 errno = EINVAL;
520 return 0;
521 }
522
523 static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
524 {
525 if (value && *value) {
526 char *end;
527 uintmax_t val;
528 uintmax_t oldval;
529
530 errno = 0;
531 val = strtoumax(value, &end, 0);
532 if (errno == ERANGE)
533 return 0;
534 oldval = val;
535 if (!parse_unit_factor(end, &val)) {
536 errno = EINVAL;
537 return 0;
538 }
539 if (val > max || oldval > val) {
540 errno = ERANGE;
541 return 0;
542 }
543 *ret = val;
544 return 1;
545 }
546 errno = EINVAL;
547 return 0;
548 }
549
550 static int git_parse_int(const char *value, int *ret)
551 {
552 intmax_t tmp;
553 if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
554 return 0;
555 *ret = tmp;
556 return 1;
557 }
558
559 static int git_parse_int64(const char *value, int64_t *ret)
560 {
561 intmax_t tmp;
562 if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
563 return 0;
564 *ret = tmp;
565 return 1;
566 }
567
568 int git_parse_ulong(const char *value, unsigned long *ret)
569 {
570 uintmax_t tmp;
571 if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
572 return 0;
573 *ret = tmp;
574 return 1;
575 }
576
577 NORETURN
578 static void die_bad_number(const char *name, const char *value)
579 {
580 const char *reason = errno == ERANGE ?
581 "out of range" :
582 "invalid unit";
583 if (!value)
584 value = "";
585
586 if (cf && cf->name)
587 die(_("bad numeric config value '%s' for '%s' in %s: %s"),
588 value, name, cf->name, reason);
589 die(_("bad numeric config value '%s' for '%s': %s"), value, name, reason);
590 }
591
592 int git_config_int(const char *name, const char *value)
593 {
594 int ret;
595 if (!git_parse_int(value, &ret))
596 die_bad_number(name, value);
597 return ret;
598 }
599
600 int64_t git_config_int64(const char *name, const char *value)
601 {
602 int64_t ret;
603 if (!git_parse_int64(value, &ret))
604 die_bad_number(name, value);
605 return ret;
606 }
607
608 unsigned long git_config_ulong(const char *name, const char *value)
609 {
610 unsigned long ret;
611 if (!git_parse_ulong(value, &ret))
612 die_bad_number(name, value);
613 return ret;
614 }
615
616 static int git_config_maybe_bool_text(const char *name, const char *value)
617 {
618 if (!value)
619 return 1;
620 if (!*value)
621 return 0;
622 if (!strcasecmp(value, "true")
623 || !strcasecmp(value, "yes")
624 || !strcasecmp(value, "on"))
625 return 1;
626 if (!strcasecmp(value, "false")
627 || !strcasecmp(value, "no")
628 || !strcasecmp(value, "off"))
629 return 0;
630 return -1;
631 }
632
633 int git_config_maybe_bool(const char *name, const char *value)
634 {
635 int v = git_config_maybe_bool_text(name, value);
636 if (0 <= v)
637 return v;
638 if (git_parse_int(value, &v))
639 return !!v;
640 return -1;
641 }
642
643 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
644 {
645 int v = git_config_maybe_bool_text(name, value);
646 if (0 <= v) {
647 *is_bool = 1;
648 return v;
649 }
650 *is_bool = 0;
651 return git_config_int(name, value);
652 }
653
654 int git_config_bool(const char *name, const char *value)
655 {
656 int discard;
657 return !!git_config_bool_or_int(name, value, &discard);
658 }
659
660 int git_config_string(const char **dest, const char *var, const char *value)
661 {
662 if (!value)
663 return config_error_nonbool(var);
664 *dest = xstrdup(value);
665 return 0;
666 }
667
668 int git_config_pathname(const char **dest, const char *var, const char *value)
669 {
670 if (!value)
671 return config_error_nonbool(var);
672 *dest = expand_user_path(value);
673 if (!*dest)
674 die(_("failed to expand user dir in: '%s'"), value);
675 return 0;
676 }
677
678 static int git_default_core_config(const char *var, const char *value)
679 {
680 /* This needs a better name */
681 if (!strcmp(var, "core.filemode")) {
682 trust_executable_bit = git_config_bool(var, value);
683 return 0;
684 }
685 if (!strcmp(var, "core.trustctime")) {
686 trust_ctime = git_config_bool(var, value);
687 return 0;
688 }
689 if (!strcmp(var, "core.checkstat")) {
690 if (!strcasecmp(value, "default"))
691 check_stat = 1;
692 else if (!strcasecmp(value, "minimal"))
693 check_stat = 0;
694 }
695
696 if (!strcmp(var, "core.quotepath")) {
697 quote_path_fully = git_config_bool(var, value);
698 return 0;
699 }
700
701 if (!strcmp(var, "core.symlinks")) {
702 has_symlinks = git_config_bool(var, value);
703 return 0;
704 }
705
706 if (!strcmp(var, "core.ignorecase")) {
707 ignore_case = git_config_bool(var, value);
708 return 0;
709 }
710
711 if (!strcmp(var, "core.attributesfile"))
712 return git_config_pathname(&git_attributes_file, var, value);
713
714 if (!strcmp(var, "core.bare")) {
715 is_bare_repository_cfg = git_config_bool(var, value);
716 return 0;
717 }
718
719 if (!strcmp(var, "core.ignorestat")) {
720 assume_unchanged = git_config_bool(var, value);
721 return 0;
722 }
723
724 if (!strcmp(var, "core.prefersymlinkrefs")) {
725 prefer_symlink_refs = git_config_bool(var, value);
726 return 0;
727 }
728
729 if (!strcmp(var, "core.logallrefupdates")) {
730 log_all_ref_updates = git_config_bool(var, value);
731 return 0;
732 }
733
734 if (!strcmp(var, "core.warnambiguousrefs")) {
735 warn_ambiguous_refs = git_config_bool(var, value);
736 return 0;
737 }
738
739 if (!strcmp(var, "core.abbrev")) {
740 int abbrev = git_config_int(var, value);
741 if (abbrev < minimum_abbrev || abbrev > 40)
742 return -1;
743 default_abbrev = abbrev;
744 return 0;
745 }
746
747 if (!strcmp(var, "core.loosecompression")) {
748 int level = git_config_int(var, value);
749 if (level == -1)
750 level = Z_DEFAULT_COMPRESSION;
751 else if (level < 0 || level > Z_BEST_COMPRESSION)
752 die(_("bad zlib compression level %d"), level);
753 zlib_compression_level = level;
754 zlib_compression_seen = 1;
755 return 0;
756 }
757
758 if (!strcmp(var, "core.compression")) {
759 int level = git_config_int(var, value);
760 if (level == -1)
761 level = Z_DEFAULT_COMPRESSION;
762 else if (level < 0 || level > Z_BEST_COMPRESSION)
763 die(_("bad zlib compression level %d"), level);
764 core_compression_level = level;
765 core_compression_seen = 1;
766 if (!zlib_compression_seen)
767 zlib_compression_level = level;
768 return 0;
769 }
770
771 if (!strcmp(var, "core.packedgitwindowsize")) {
772 int pgsz_x2 = getpagesize() * 2;
773 packed_git_window_size = git_config_ulong(var, value);
774
775 /* This value must be multiple of (pagesize * 2) */
776 packed_git_window_size /= pgsz_x2;
777 if (packed_git_window_size < 1)
778 packed_git_window_size = 1;
779 packed_git_window_size *= pgsz_x2;
780 return 0;
781 }
782
783 if (!strcmp(var, "core.bigfilethreshold")) {
784 big_file_threshold = git_config_ulong(var, value);
785 return 0;
786 }
787
788 if (!strcmp(var, "core.packedgitlimit")) {
789 packed_git_limit = git_config_ulong(var, value);
790 return 0;
791 }
792
793 if (!strcmp(var, "core.deltabasecachelimit")) {
794 delta_base_cache_limit = git_config_ulong(var, value);
795 return 0;
796 }
797
798 if (!strcmp(var, "core.autocrlf")) {
799 if (value && !strcasecmp(value, "input")) {
800 if (core_eol == EOL_CRLF)
801 return error("core.autocrlf=input conflicts with core.eol=crlf");
802 auto_crlf = AUTO_CRLF_INPUT;
803 return 0;
804 }
805 auto_crlf = git_config_bool(var, value);
806 return 0;
807 }
808
809 if (!strcmp(var, "core.safecrlf")) {
810 if (value && !strcasecmp(value, "warn")) {
811 safe_crlf = SAFE_CRLF_WARN;
812 return 0;
813 }
814 safe_crlf = git_config_bool(var, value);
815 return 0;
816 }
817
818 if (!strcmp(var, "core.eol")) {
819 if (value && !strcasecmp(value, "lf"))
820 core_eol = EOL_LF;
821 else if (value && !strcasecmp(value, "crlf"))
822 core_eol = EOL_CRLF;
823 else if (value && !strcasecmp(value, "native"))
824 core_eol = EOL_NATIVE;
825 else
826 core_eol = EOL_UNSET;
827 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
828 return error("core.autocrlf=input conflicts with core.eol=crlf");
829 return 0;
830 }
831
832 if (!strcmp(var, "core.notesref")) {
833 notes_ref_name = xstrdup(value);
834 return 0;
835 }
836
837 if (!strcmp(var, "core.pager"))
838 return git_config_string(&pager_program, var, value);
839
840 if (!strcmp(var, "core.editor"))
841 return git_config_string(&editor_program, var, value);
842
843 if (!strcmp(var, "core.commentchar")) {
844 if (!value)
845 return config_error_nonbool(var);
846 else if (!strcasecmp(value, "auto"))
847 auto_comment_line_char = 1;
848 else if (value[0] && !value[1]) {
849 comment_line_char = value[0];
850 auto_comment_line_char = 0;
851 } else
852 return error("core.commentChar should only be one character");
853 return 0;
854 }
855
856 if (!strcmp(var, "core.askpass"))
857 return git_config_string(&askpass_program, var, value);
858
859 if (!strcmp(var, "core.excludesfile"))
860 return git_config_pathname(&excludes_file, var, value);
861
862 if (!strcmp(var, "core.whitespace")) {
863 if (!value)
864 return config_error_nonbool(var);
865 whitespace_rule_cfg = parse_whitespace_rule(value);
866 return 0;
867 }
868
869 if (!strcmp(var, "core.fsyncobjectfiles")) {
870 fsync_object_files = git_config_bool(var, value);
871 return 0;
872 }
873
874 if (!strcmp(var, "core.preloadindex")) {
875 core_preload_index = git_config_bool(var, value);
876 return 0;
877 }
878
879 if (!strcmp(var, "core.createobject")) {
880 if (!strcmp(value, "rename"))
881 object_creation_mode = OBJECT_CREATION_USES_RENAMES;
882 else if (!strcmp(value, "link"))
883 object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
884 else
885 die(_("invalid mode for object creation: %s"), value);
886 return 0;
887 }
888
889 if (!strcmp(var, "core.sparsecheckout")) {
890 core_apply_sparse_checkout = git_config_bool(var, value);
891 return 0;
892 }
893
894 if (!strcmp(var, "core.precomposeunicode")) {
895 precomposed_unicode = git_config_bool(var, value);
896 return 0;
897 }
898
899 /* Add other config variables here and to Documentation/config.txt. */
900 return 0;
901 }
902
903 static int git_default_i18n_config(const char *var, const char *value)
904 {
905 if (!strcmp(var, "i18n.commitencoding"))
906 return git_config_string(&git_commit_encoding, var, value);
907
908 if (!strcmp(var, "i18n.logoutputencoding"))
909 return git_config_string(&git_log_output_encoding, var, value);
910
911 /* Add other config variables here and to Documentation/config.txt. */
912 return 0;
913 }
914
915 static int git_default_branch_config(const char *var, const char *value)
916 {
917 if (!strcmp(var, "branch.autosetupmerge")) {
918 if (value && !strcasecmp(value, "always")) {
919 git_branch_track = BRANCH_TRACK_ALWAYS;
920 return 0;
921 }
922 git_branch_track = git_config_bool(var, value);
923 return 0;
924 }
925 if (!strcmp(var, "branch.autosetuprebase")) {
926 if (!value)
927 return config_error_nonbool(var);
928 else if (!strcmp(value, "never"))
929 autorebase = AUTOREBASE_NEVER;
930 else if (!strcmp(value, "local"))
931 autorebase = AUTOREBASE_LOCAL;
932 else if (!strcmp(value, "remote"))
933 autorebase = AUTOREBASE_REMOTE;
934 else if (!strcmp(value, "always"))
935 autorebase = AUTOREBASE_ALWAYS;
936 else
937 return error("Malformed value for %s", var);
938 return 0;
939 }
940
941 /* Add other config variables here and to Documentation/config.txt. */
942 return 0;
943 }
944
945 static int git_default_push_config(const char *var, const char *value)
946 {
947 if (!strcmp(var, "push.default")) {
948 if (!value)
949 return config_error_nonbool(var);
950 else if (!strcmp(value, "nothing"))
951 push_default = PUSH_DEFAULT_NOTHING;
952 else if (!strcmp(value, "matching"))
953 push_default = PUSH_DEFAULT_MATCHING;
954 else if (!strcmp(value, "simple"))
955 push_default = PUSH_DEFAULT_SIMPLE;
956 else if (!strcmp(value, "upstream"))
957 push_default = PUSH_DEFAULT_UPSTREAM;
958 else if (!strcmp(value, "tracking")) /* deprecated */
959 push_default = PUSH_DEFAULT_UPSTREAM;
960 else if (!strcmp(value, "current"))
961 push_default = PUSH_DEFAULT_CURRENT;
962 else {
963 error("Malformed value for %s: %s", var, value);
964 return error("Must be one of nothing, matching, simple, "
965 "upstream or current.");
966 }
967 return 0;
968 }
969
970 /* Add other config variables here and to Documentation/config.txt. */
971 return 0;
972 }
973
974 static int git_default_mailmap_config(const char *var, const char *value)
975 {
976 if (!strcmp(var, "mailmap.file"))
977 return git_config_pathname(&git_mailmap_file, var, value);
978 if (!strcmp(var, "mailmap.blob"))
979 return git_config_string(&git_mailmap_blob, var, value);
980
981 /* Add other config variables here and to Documentation/config.txt. */
982 return 0;
983 }
984
985 int git_default_config(const char *var, const char *value, void *dummy)
986 {
987 if (starts_with(var, "core."))
988 return git_default_core_config(var, value);
989
990 if (starts_with(var, "user."))
991 return git_ident_config(var, value, dummy);
992
993 if (starts_with(var, "i18n."))
994 return git_default_i18n_config(var, value);
995
996 if (starts_with(var, "branch."))
997 return git_default_branch_config(var, value);
998
999 if (starts_with(var, "push."))
1000 return git_default_push_config(var, value);
1001
1002 if (starts_with(var, "mailmap."))
1003 return git_default_mailmap_config(var, value);
1004
1005 if (starts_with(var, "advice."))
1006 return git_default_advice_config(var, value);
1007
1008 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1009 pager_use_color = git_config_bool(var,value);
1010 return 0;
1011 }
1012
1013 if (!strcmp(var, "pack.packsizelimit")) {
1014 pack_size_limit_cfg = git_config_ulong(var, value);
1015 return 0;
1016 }
1017 /* Add other config variables here and to Documentation/config.txt. */
1018 return 0;
1019 }
1020
1021 /*
1022 * All source specific fields in the union, die_on_error, name and the callbacks
1023 * fgetc, ungetc, ftell of top need to be initialized before calling
1024 * this function.
1025 */
1026 static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1027 {
1028 int ret;
1029
1030 /* push config-file parsing state stack */
1031 top->prev = cf;
1032 top->linenr = 1;
1033 top->eof = 0;
1034 strbuf_init(&top->value, 1024);
1035 strbuf_init(&top->var, 1024);
1036 cf = top;
1037
1038 ret = git_parse_source(fn, data);
1039
1040 /* pop config-file parsing state stack */
1041 strbuf_release(&top->value);
1042 strbuf_release(&top->var);
1043 cf = top->prev;
1044
1045 return ret;
1046 }
1047
1048 static int do_config_from_file(config_fn_t fn,
1049 const char *name, const char *path, FILE *f, void *data)
1050 {
1051 struct config_source top;
1052
1053 top.u.file = f;
1054 top.name = name;
1055 top.path = path;
1056 top.die_on_error = 1;
1057 top.do_fgetc = config_file_fgetc;
1058 top.do_ungetc = config_file_ungetc;
1059 top.do_ftell = config_file_ftell;
1060
1061 return do_config_from(&top, fn, data);
1062 }
1063
1064 static int git_config_from_stdin(config_fn_t fn, void *data)
1065 {
1066 return do_config_from_file(fn, "<stdin>", NULL, stdin, data);
1067 }
1068
1069 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1070 {
1071 int ret = -1;
1072 FILE *f;
1073
1074 f = fopen(filename, "r");
1075 if (f) {
1076 ret = do_config_from_file(fn, filename, filename, f, data);
1077 fclose(f);
1078 }
1079 return ret;
1080 }
1081
1082 int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1083 size_t len, void *data)
1084 {
1085 struct config_source top;
1086
1087 top.u.buf.buf = buf;
1088 top.u.buf.len = len;
1089 top.u.buf.pos = 0;
1090 top.name = name;
1091 top.path = NULL;
1092 top.die_on_error = 0;
1093 top.do_fgetc = config_buf_fgetc;
1094 top.do_ungetc = config_buf_ungetc;
1095 top.do_ftell = config_buf_ftell;
1096
1097 return do_config_from(&top, fn, data);
1098 }
1099
1100 static int git_config_from_blob_sha1(config_fn_t fn,
1101 const char *name,
1102 const unsigned char *sha1,
1103 void *data)
1104 {
1105 enum object_type type;
1106 char *buf;
1107 unsigned long size;
1108 int ret;
1109
1110 buf = read_sha1_file(sha1, &type, &size);
1111 if (!buf)
1112 return error("unable to load config blob object '%s'", name);
1113 if (type != OBJ_BLOB) {
1114 free(buf);
1115 return error("reference '%s' does not point to a blob", name);
1116 }
1117
1118 ret = git_config_from_buf(fn, name, buf, size, data);
1119 free(buf);
1120
1121 return ret;
1122 }
1123
1124 static int git_config_from_blob_ref(config_fn_t fn,
1125 const char *name,
1126 void *data)
1127 {
1128 unsigned char sha1[20];
1129
1130 if (get_sha1(name, sha1) < 0)
1131 return error("unable to resolve config blob '%s'", name);
1132 return git_config_from_blob_sha1(fn, name, sha1, data);
1133 }
1134
1135 const char *git_etc_gitconfig(void)
1136 {
1137 static const char *system_wide;
1138 if (!system_wide)
1139 system_wide = system_path(ETC_GITCONFIG);
1140 return system_wide;
1141 }
1142
1143 int git_env_bool(const char *k, int def)
1144 {
1145 const char *v = getenv(k);
1146 return v ? git_config_bool(k, v) : def;
1147 }
1148
1149 int git_config_system(void)
1150 {
1151 return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1152 }
1153
1154 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1155 {
1156 int ret = 0, found = 0;
1157 char *xdg_config = NULL;
1158 char *user_config = NULL;
1159
1160 home_config_paths(&user_config, &xdg_config, "config");
1161
1162 if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1163 ret += git_config_from_file(fn, git_etc_gitconfig(),
1164 data);
1165 found += 1;
1166 }
1167
1168 if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1169 ret += git_config_from_file(fn, xdg_config, data);
1170 found += 1;
1171 }
1172
1173 if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1174 ret += git_config_from_file(fn, user_config, data);
1175 found += 1;
1176 }
1177
1178 if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1179 ret += git_config_from_file(fn, repo_config, data);
1180 found += 1;
1181 }
1182
1183 switch (git_config_from_parameters(fn, data)) {
1184 case -1: /* error */
1185 die(_("unable to parse command-line config"));
1186 break;
1187 case 0: /* found nothing */
1188 break;
1189 default: /* found at least one item */
1190 found++;
1191 break;
1192 }
1193
1194 free(xdg_config);
1195 free(user_config);
1196 return ret == 0 ? found : ret;
1197 }
1198
1199 int git_config_with_options(config_fn_t fn, void *data,
1200 struct git_config_source *config_source,
1201 int respect_includes)
1202 {
1203 char *repo_config = NULL;
1204 int ret;
1205 struct config_include_data inc = CONFIG_INCLUDE_INIT;
1206
1207 if (respect_includes) {
1208 inc.fn = fn;
1209 inc.data = data;
1210 fn = git_config_include;
1211 data = &inc;
1212 }
1213
1214 /*
1215 * If we have a specific filename, use it. Otherwise, follow the
1216 * regular lookup sequence.
1217 */
1218 if (config_source && config_source->use_stdin)
1219 return git_config_from_stdin(fn, data);
1220 else if (config_source && config_source->file)
1221 return git_config_from_file(fn, config_source->file, data);
1222 else if (config_source && config_source->blob)
1223 return git_config_from_blob_ref(fn, config_source->blob, data);
1224
1225 repo_config = git_pathdup("config");
1226 ret = git_config_early(fn, data, repo_config);
1227 if (repo_config)
1228 free(repo_config);
1229 return ret;
1230 }
1231
1232 static void git_config_raw(config_fn_t fn, void *data)
1233 {
1234 if (git_config_with_options(fn, data, NULL, 1) < 0)
1235 /*
1236 * git_config_with_options() normally returns only
1237 * positive values, as most errors are fatal, and
1238 * non-fatal potential errors are guarded by "if"
1239 * statements that are entered only when no error is
1240 * possible.
1241 *
1242 * If we ever encounter a non-fatal error, it means
1243 * something went really wrong and we should stop
1244 * immediately.
1245 */
1246 die(_("unknown error occured while reading the configuration files"));
1247 }
1248
1249 static void configset_iter(struct config_set *cs, config_fn_t fn, void *data)
1250 {
1251 int i, value_index;
1252 struct string_list *values;
1253 struct config_set_element *entry;
1254 struct configset_list *list = &cs->list;
1255 struct key_value_info *kv_info;
1256
1257 for (i = 0; i < list->nr; i++) {
1258 entry = list->items[i].e;
1259 value_index = list->items[i].value_index;
1260 values = &entry->value_list;
1261 if (fn(entry->key, values->items[value_index].string, data) < 0) {
1262 kv_info = values->items[value_index].util;
1263 git_die_config_linenr(entry->key, kv_info->filename, kv_info->linenr);
1264 }
1265 }
1266 }
1267
1268 static void git_config_check_init(void);
1269
1270 void git_config(config_fn_t fn, void *data)
1271 {
1272 git_config_check_init();
1273 configset_iter(&the_config_set, fn, data);
1274 }
1275
1276 static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1277 {
1278 struct config_set_element k;
1279 struct config_set_element *found_entry;
1280 char *normalized_key;
1281 int ret;
1282 /*
1283 * `key` may come from the user, so normalize it before using it
1284 * for querying entries from the hashmap.
1285 */
1286 ret = git_config_parse_key(key, &normalized_key, NULL);
1287
1288 if (ret)
1289 return NULL;
1290
1291 hashmap_entry_init(&k, strhash(normalized_key));
1292 k.key = normalized_key;
1293 found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1294 free(normalized_key);
1295 return found_entry;
1296 }
1297
1298 static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1299 {
1300 struct config_set_element *e;
1301 struct string_list_item *si;
1302 struct configset_list_item *l_item;
1303 struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));
1304
1305 e = configset_find_element(cs, key);
1306 /*
1307 * Since the keys are being fed by git_config*() callback mechanism, they
1308 * are already normalized. So simply add them without any further munging.
1309 */
1310 if (!e) {
1311 e = xmalloc(sizeof(*e));
1312 hashmap_entry_init(e, strhash(key));
1313 e->key = xstrdup(key);
1314 string_list_init(&e->value_list, 1);
1315 hashmap_add(&cs->config_hash, e);
1316 }
1317 si = string_list_append_nodup(&e->value_list, value ? xstrdup(value) : NULL);
1318
1319 ALLOC_GROW(cs->list.items, cs->list.nr + 1, cs->list.alloc);
1320 l_item = &cs->list.items[cs->list.nr++];
1321 l_item->e = e;
1322 l_item->value_index = e->value_list.nr - 1;
1323
1324 if (cf) {
1325 kv_info->filename = strintern(cf->name);
1326 kv_info->linenr = cf->linenr;
1327 } else {
1328 /* for values read from `git_config_from_parameters()` */
1329 kv_info->filename = NULL;
1330 kv_info->linenr = -1;
1331 }
1332 si->util = kv_info;
1333
1334 return 0;
1335 }
1336
1337 static int config_set_element_cmp(const struct config_set_element *e1,
1338 const struct config_set_element *e2, const void *unused)
1339 {
1340 return strcmp(e1->key, e2->key);
1341 }
1342
1343 void git_configset_init(struct config_set *cs)
1344 {
1345 hashmap_init(&cs->config_hash, (hashmap_cmp_fn)config_set_element_cmp, 0);
1346 cs->hash_initialized = 1;
1347 cs->list.nr = 0;
1348 cs->list.alloc = 0;
1349 cs->list.items = NULL;
1350 }
1351
1352 void git_configset_clear(struct config_set *cs)
1353 {
1354 struct config_set_element *entry;
1355 struct hashmap_iter iter;
1356 if (!cs->hash_initialized)
1357 return;
1358
1359 hashmap_iter_init(&cs->config_hash, &iter);
1360 while ((entry = hashmap_iter_next(&iter))) {
1361 free(entry->key);
1362 string_list_clear(&entry->value_list, 1);
1363 }
1364 hashmap_free(&cs->config_hash, 1);
1365 cs->hash_initialized = 0;
1366 free(cs->list.items);
1367 cs->list.nr = 0;
1368 cs->list.alloc = 0;
1369 cs->list.items = NULL;
1370 }
1371
1372 static int config_set_callback(const char *key, const char *value, void *cb)
1373 {
1374 struct config_set *cs = cb;
1375 configset_add_value(cs, key, value);
1376 return 0;
1377 }
1378
1379 int git_configset_add_file(struct config_set *cs, const char *filename)
1380 {
1381 return git_config_from_file(config_set_callback, filename, cs);
1382 }
1383
1384 int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1385 {
1386 const struct string_list *values = NULL;
1387 /*
1388 * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1389 * queried key in the files of the configset, the value returned will be the last
1390 * value in the value list for that key.
1391 */
1392 values = git_configset_get_value_multi(cs, key);
1393
1394 if (!values)
1395 return 1;
1396 assert(values->nr > 0);
1397 *value = values->items[values->nr - 1].string;
1398 return 0;
1399 }
1400
1401 const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1402 {
1403 struct config_set_element *e = configset_find_element(cs, key);
1404 return e ? &e->value_list : NULL;
1405 }
1406
1407 int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1408 {
1409 const char *value;
1410 if (!git_configset_get_value(cs, key, &value))
1411 return git_config_string(dest, key, value);
1412 else
1413 return 1;
1414 }
1415
1416 int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1417 {
1418 return git_configset_get_string_const(cs, key, (const char **)dest);
1419 }
1420
1421 int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1422 {
1423 const char *value;
1424 if (!git_configset_get_value(cs, key, &value)) {
1425 *dest = git_config_int(key, value);
1426 return 0;
1427 } else
1428 return 1;
1429 }
1430
1431 int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1432 {
1433 const char *value;
1434 if (!git_configset_get_value(cs, key, &value)) {
1435 *dest = git_config_ulong(key, value);
1436 return 0;
1437 } else
1438 return 1;
1439 }
1440
1441 int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1442 {
1443 const char *value;
1444 if (!git_configset_get_value(cs, key, &value)) {
1445 *dest = git_config_bool(key, value);
1446 return 0;
1447 } else
1448 return 1;
1449 }
1450
1451 int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1452 int *is_bool, int *dest)
1453 {
1454 const char *value;
1455 if (!git_configset_get_value(cs, key, &value)) {
1456 *dest = git_config_bool_or_int(key, value, is_bool);
1457 return 0;
1458 } else
1459 return 1;
1460 }
1461
1462 int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1463 {
1464 const char *value;
1465 if (!git_configset_get_value(cs, key, &value)) {
1466 *dest = git_config_maybe_bool(key, value);
1467 if (*dest == -1)
1468 return -1;
1469 return 0;
1470 } else
1471 return 1;
1472 }
1473
1474 int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
1475 {
1476 const char *value;
1477 if (!git_configset_get_value(cs, key, &value))
1478 return git_config_pathname(dest, key, value);
1479 else
1480 return 1;
1481 }
1482
1483 static void git_config_check_init(void)
1484 {
1485 if (the_config_set.hash_initialized)
1486 return;
1487 git_configset_init(&the_config_set);
1488 git_config_raw(config_set_callback, &the_config_set);
1489 }
1490
1491 void git_config_clear(void)
1492 {
1493 if (!the_config_set.hash_initialized)
1494 return;
1495 git_configset_clear(&the_config_set);
1496 }
1497
1498 int git_config_get_value(const char *key, const char **value)
1499 {
1500 git_config_check_init();
1501 return git_configset_get_value(&the_config_set, key, value);
1502 }
1503
1504 const struct string_list *git_config_get_value_multi(const char *key)
1505 {
1506 git_config_check_init();
1507 return git_configset_get_value_multi(&the_config_set, key);
1508 }
1509
1510 int git_config_get_string_const(const char *key, const char **dest)
1511 {
1512 int ret;
1513 git_config_check_init();
1514 ret = git_configset_get_string_const(&the_config_set, key, dest);
1515 if (ret < 0)
1516 git_die_config(key, NULL);
1517 return ret;
1518 }
1519
1520 int git_config_get_string(const char *key, char **dest)
1521 {
1522 git_config_check_init();
1523 return git_config_get_string_const(key, (const char **)dest);
1524 }
1525
1526 int git_config_get_int(const char *key, int *dest)
1527 {
1528 git_config_check_init();
1529 return git_configset_get_int(&the_config_set, key, dest);
1530 }
1531
1532 int git_config_get_ulong(const char *key, unsigned long *dest)
1533 {
1534 git_config_check_init();
1535 return git_configset_get_ulong(&the_config_set, key, dest);
1536 }
1537
1538 int git_config_get_bool(const char *key, int *dest)
1539 {
1540 git_config_check_init();
1541 return git_configset_get_bool(&the_config_set, key, dest);
1542 }
1543
1544 int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
1545 {
1546 git_config_check_init();
1547 return git_configset_get_bool_or_int(&the_config_set, key, is_bool, dest);
1548 }
1549
1550 int git_config_get_maybe_bool(const char *key, int *dest)
1551 {
1552 git_config_check_init();
1553 return git_configset_get_maybe_bool(&the_config_set, key, dest);
1554 }
1555
1556 int git_config_get_pathname(const char *key, const char **dest)
1557 {
1558 int ret;
1559 git_config_check_init();
1560 ret = git_configset_get_pathname(&the_config_set, key, dest);
1561 if (ret < 0)
1562 git_die_config(key, NULL);
1563 return ret;
1564 }
1565
1566 NORETURN
1567 void git_die_config_linenr(const char *key, const char *filename, int linenr)
1568 {
1569 if (!filename)
1570 die(_("unable to parse '%s' from command-line config"), key);
1571 else
1572 die(_("bad config variable '%s' in file '%s' at line %d"),
1573 key, filename, linenr);
1574 }
1575
1576 NORETURN __attribute__((format(printf, 2, 3)))
1577 void git_die_config(const char *key, const char *err, ...)
1578 {
1579 const struct string_list *values;
1580 struct key_value_info *kv_info;
1581
1582 if (err) {
1583 va_list params;
1584 va_start(params, err);
1585 vreportf("error: ", err, params);
1586 va_end(params);
1587 }
1588 values = git_config_get_value_multi(key);
1589 kv_info = values->items[values->nr - 1].util;
1590 git_die_config_linenr(key, kv_info->filename, kv_info->linenr);
1591 }
1592
1593 /*
1594 * Find all the stuff for git_config_set() below.
1595 */
1596
1597 static struct {
1598 int baselen;
1599 char *key;
1600 int do_not_match;
1601 regex_t *value_regex;
1602 int multi_replace;
1603 size_t *offset;
1604 unsigned int offset_alloc;
1605 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1606 int seen;
1607 } store;
1608
1609 static int matches(const char *key, const char *value)
1610 {
1611 if (strcmp(key, store.key))
1612 return 0; /* not ours */
1613 if (!store.value_regex)
1614 return 1; /* always matches */
1615 if (store.value_regex == CONFIG_REGEX_NONE)
1616 return 0; /* never matches */
1617
1618 return store.do_not_match ^
1619 (value && !regexec(store.value_regex, value, 0, NULL, 0));
1620 }
1621
1622 static int store_aux(const char *key, const char *value, void *cb)
1623 {
1624 const char *ep;
1625 size_t section_len;
1626
1627 switch (store.state) {
1628 case KEY_SEEN:
1629 if (matches(key, value)) {
1630 if (store.seen == 1 && store.multi_replace == 0) {
1631 warning(_("%s has multiple values"), key);
1632 }
1633
1634 ALLOC_GROW(store.offset, store.seen + 1,
1635 store.offset_alloc);
1636
1637 store.offset[store.seen] = cf->do_ftell(cf);
1638 store.seen++;
1639 }
1640 break;
1641 case SECTION_SEEN:
1642 /*
1643 * What we are looking for is in store.key (both
1644 * section and var), and its section part is baselen
1645 * long. We found key (again, both section and var).
1646 * We would want to know if this key is in the same
1647 * section as what we are looking for. We already
1648 * know we are in the same section as what should
1649 * hold store.key.
1650 */
1651 ep = strrchr(key, '.');
1652 section_len = ep - key;
1653
1654 if ((section_len != store.baselen) ||
1655 memcmp(key, store.key, section_len+1)) {
1656 store.state = SECTION_END_SEEN;
1657 break;
1658 }
1659
1660 /*
1661 * Do not increment matches: this is no match, but we
1662 * just made sure we are in the desired section.
1663 */
1664 ALLOC_GROW(store.offset, store.seen + 1,
1665 store.offset_alloc);
1666 store.offset[store.seen] = cf->do_ftell(cf);
1667 /* fallthru */
1668 case SECTION_END_SEEN:
1669 case START:
1670 if (matches(key, value)) {
1671 ALLOC_GROW(store.offset, store.seen + 1,
1672 store.offset_alloc);
1673 store.offset[store.seen] = cf->do_ftell(cf);
1674 store.state = KEY_SEEN;
1675 store.seen++;
1676 } else {
1677 if (strrchr(key, '.') - key == store.baselen &&
1678 !strncmp(key, store.key, store.baselen)) {
1679 store.state = SECTION_SEEN;
1680 ALLOC_GROW(store.offset,
1681 store.seen + 1,
1682 store.offset_alloc);
1683 store.offset[store.seen] = cf->do_ftell(cf);
1684 }
1685 }
1686 }
1687 return 0;
1688 }
1689
1690 static int write_error(const char *filename)
1691 {
1692 error("failed to write new configuration file %s", filename);
1693
1694 /* Same error code as "failed to rename". */
1695 return 4;
1696 }
1697
1698 static int store_write_section(int fd, const char *key)
1699 {
1700 const char *dot;
1701 int i, success;
1702 struct strbuf sb = STRBUF_INIT;
1703
1704 dot = memchr(key, '.', store.baselen);
1705 if (dot) {
1706 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1707 for (i = dot - key + 1; i < store.baselen; i++) {
1708 if (key[i] == '"' || key[i] == '\\')
1709 strbuf_addch(&sb, '\\');
1710 strbuf_addch(&sb, key[i]);
1711 }
1712 strbuf_addstr(&sb, "\"]\n");
1713 } else {
1714 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1715 }
1716
1717 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1718 strbuf_release(&sb);
1719
1720 return success;
1721 }
1722
1723 static int store_write_pair(int fd, const char *key, const char *value)
1724 {
1725 int i, success;
1726 int length = strlen(key + store.baselen + 1);
1727 const char *quote = "";
1728 struct strbuf sb = STRBUF_INIT;
1729
1730 /*
1731 * Check to see if the value needs to be surrounded with a dq pair.
1732 * Note that problematic characters are always backslash-quoted; this
1733 * check is about not losing leading or trailing SP and strings that
1734 * follow beginning-of-comment characters (i.e. ';' and '#') by the
1735 * configuration parser.
1736 */
1737 if (value[0] == ' ')
1738 quote = "\"";
1739 for (i = 0; value[i]; i++)
1740 if (value[i] == ';' || value[i] == '#')
1741 quote = "\"";
1742 if (i && value[i - 1] == ' ')
1743 quote = "\"";
1744
1745 strbuf_addf(&sb, "\t%.*s = %s",
1746 length, key + store.baselen + 1, quote);
1747
1748 for (i = 0; value[i]; i++)
1749 switch (value[i]) {
1750 case '\n':
1751 strbuf_addstr(&sb, "\\n");
1752 break;
1753 case '\t':
1754 strbuf_addstr(&sb, "\\t");
1755 break;
1756 case '"':
1757 case '\\':
1758 strbuf_addch(&sb, '\\');
1759 default:
1760 strbuf_addch(&sb, value[i]);
1761 break;
1762 }
1763 strbuf_addf(&sb, "%s\n", quote);
1764
1765 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1766 strbuf_release(&sb);
1767
1768 return success;
1769 }
1770
1771 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1772 size_t offset_, int *found_bracket)
1773 {
1774 size_t equal_offset = size, bracket_offset = size;
1775 ssize_t offset;
1776
1777 contline:
1778 for (offset = offset_-2; offset > 0
1779 && contents[offset] != '\n'; offset--)
1780 switch (contents[offset]) {
1781 case '=': equal_offset = offset; break;
1782 case ']': bracket_offset = offset; break;
1783 }
1784 if (offset > 0 && contents[offset-1] == '\\') {
1785 offset_ = offset;
1786 goto contline;
1787 }
1788 if (bracket_offset < equal_offset) {
1789 *found_bracket = 1;
1790 offset = bracket_offset+1;
1791 } else
1792 offset++;
1793
1794 return offset;
1795 }
1796
1797 int git_config_set_in_file(const char *config_filename,
1798 const char *key, const char *value)
1799 {
1800 return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1801 }
1802
1803 int git_config_set(const char *key, const char *value)
1804 {
1805 return git_config_set_multivar(key, value, NULL, 0);
1806 }
1807
1808 /*
1809 * Auxiliary function to sanity-check and split the key into the section
1810 * identifier and variable name.
1811 *
1812 * Returns 0 on success, -1 when there is an invalid character in the key and
1813 * -2 if there is no section name in the key.
1814 *
1815 * store_key - pointer to char* which will hold a copy of the key with
1816 * lowercase section and variable name
1817 * baselen - pointer to int which will hold the length of the
1818 * section + subsection part, can be NULL
1819 */
1820 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1821 {
1822 int i, dot, baselen;
1823 const char *last_dot = strrchr(key, '.');
1824
1825 /*
1826 * Since "key" actually contains the section name and the real
1827 * key name separated by a dot, we have to know where the dot is.
1828 */
1829
1830 if (last_dot == NULL || last_dot == key) {
1831 error("key does not contain a section: %s", key);
1832 return -CONFIG_NO_SECTION_OR_NAME;
1833 }
1834
1835 if (!last_dot[1]) {
1836 error("key does not contain variable name: %s", key);
1837 return -CONFIG_NO_SECTION_OR_NAME;
1838 }
1839
1840 baselen = last_dot - key;
1841 if (baselen_)
1842 *baselen_ = baselen;
1843
1844 /*
1845 * Validate the key and while at it, lower case it for matching.
1846 */
1847 *store_key = xmalloc(strlen(key) + 1);
1848
1849 dot = 0;
1850 for (i = 0; key[i]; i++) {
1851 unsigned char c = key[i];
1852 if (c == '.')
1853 dot = 1;
1854 /* Leave the extended basename untouched.. */
1855 if (!dot || i > baselen) {
1856 if (!iskeychar(c) ||
1857 (i == baselen + 1 && !isalpha(c))) {
1858 error("invalid key: %s", key);
1859 goto out_free_ret_1;
1860 }
1861 c = tolower(c);
1862 } else if (c == '\n') {
1863 error("invalid key (newline): %s", key);
1864 goto out_free_ret_1;
1865 }
1866 (*store_key)[i] = c;
1867 }
1868 (*store_key)[i] = 0;
1869
1870 return 0;
1871
1872 out_free_ret_1:
1873 free(*store_key);
1874 *store_key = NULL;
1875 return -CONFIG_INVALID_KEY;
1876 }
1877
1878 /*
1879 * If value==NULL, unset in (remove from) config,
1880 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1881 * if value_regex==CONFIG_REGEX_NONE, do not match any existing values
1882 * (only add a new one)
1883 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1884 * else all matching key/values (regardless how many) are removed,
1885 * before the new pair is written.
1886 *
1887 * Returns 0 on success.
1888 *
1889 * This function does this:
1890 *
1891 * - it locks the config file by creating ".git/config.lock"
1892 *
1893 * - it then parses the config using store_aux() as validator to find
1894 * the position on the key/value pair to replace. If it is to be unset,
1895 * it must be found exactly once.
1896 *
1897 * - the config file is mmap()ed and the part before the match (if any) is
1898 * written to the lock file, then the changed part and the rest.
1899 *
1900 * - the config file is removed and the lock file rename()d to it.
1901 *
1902 */
1903 int git_config_set_multivar_in_file(const char *config_filename,
1904 const char *key, const char *value,
1905 const char *value_regex, int multi_replace)
1906 {
1907 int fd = -1, in_fd;
1908 int ret;
1909 struct lock_file *lock = NULL;
1910 char *filename_buf = NULL;
1911
1912 /* parse-key returns negative; flip the sign to feed exit(3) */
1913 ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1914 if (ret)
1915 goto out_free;
1916
1917 store.multi_replace = multi_replace;
1918
1919 if (!config_filename)
1920 config_filename = filename_buf = git_pathdup("config");
1921
1922 /*
1923 * The lock serves a purpose in addition to locking: the new
1924 * contents of .git/config will be written into it.
1925 */
1926 lock = xcalloc(1, sizeof(struct lock_file));
1927 fd = hold_lock_file_for_update(lock, config_filename, 0);
1928 if (fd < 0) {
1929 error("could not lock config file %s: %s", config_filename, strerror(errno));
1930 free(store.key);
1931 ret = CONFIG_NO_LOCK;
1932 goto out_free;
1933 }
1934
1935 /*
1936 * If .git/config does not exist yet, write a minimal version.
1937 */
1938 in_fd = open(config_filename, O_RDONLY);
1939 if ( in_fd < 0 ) {
1940 free(store.key);
1941
1942 if ( ENOENT != errno ) {
1943 error("opening %s: %s", config_filename,
1944 strerror(errno));
1945 ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1946 goto out_free;
1947 }
1948 /* if nothing to unset, error out */
1949 if (value == NULL) {
1950 ret = CONFIG_NOTHING_SET;
1951 goto out_free;
1952 }
1953
1954 store.key = (char *)key;
1955 if (!store_write_section(fd, key) ||
1956 !store_write_pair(fd, key, value))
1957 goto write_err_out;
1958 } else {
1959 struct stat st;
1960 char *contents;
1961 size_t contents_sz, copy_begin, copy_end;
1962 int i, new_line = 0;
1963
1964 if (value_regex == NULL)
1965 store.value_regex = NULL;
1966 else if (value_regex == CONFIG_REGEX_NONE)
1967 store.value_regex = CONFIG_REGEX_NONE;
1968 else {
1969 if (value_regex[0] == '!') {
1970 store.do_not_match = 1;
1971 value_regex++;
1972 } else
1973 store.do_not_match = 0;
1974
1975 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1976 if (regcomp(store.value_regex, value_regex,
1977 REG_EXTENDED)) {
1978 error("invalid pattern: %s", value_regex);
1979 free(store.value_regex);
1980 ret = CONFIG_INVALID_PATTERN;
1981 goto out_free;
1982 }
1983 }
1984
1985 ALLOC_GROW(store.offset, 1, store.offset_alloc);
1986 store.offset[0] = 0;
1987 store.state = START;
1988 store.seen = 0;
1989
1990 /*
1991 * After this, store.offset will contain the *end* offset
1992 * of the last match, or remain at 0 if no match was found.
1993 * As a side effect, we make sure to transform only a valid
1994 * existing config file.
1995 */
1996 if (git_config_from_file(store_aux, config_filename, NULL)) {
1997 error("invalid config file %s", config_filename);
1998 free(store.key);
1999 if (store.value_regex != NULL &&
2000 store.value_regex != CONFIG_REGEX_NONE) {
2001 regfree(store.value_regex);
2002 free(store.value_regex);
2003 }
2004 ret = CONFIG_INVALID_FILE;
2005 goto out_free;
2006 }
2007
2008 free(store.key);
2009 if (store.value_regex != NULL &&
2010 store.value_regex != CONFIG_REGEX_NONE) {
2011 regfree(store.value_regex);
2012 free(store.value_regex);
2013 }
2014
2015 /* if nothing to unset, or too many matches, error out */
2016 if ((store.seen == 0 && value == NULL) ||
2017 (store.seen > 1 && multi_replace == 0)) {
2018 ret = CONFIG_NOTHING_SET;
2019 goto out_free;
2020 }
2021
2022 fstat(in_fd, &st);
2023 contents_sz = xsize_t(st.st_size);
2024 contents = xmmap(NULL, contents_sz, PROT_READ,
2025 MAP_PRIVATE, in_fd, 0);
2026 close(in_fd);
2027
2028 if (chmod(lock->filename.buf, st.st_mode & 07777) < 0) {
2029 error("chmod on %s failed: %s",
2030 lock->filename.buf, strerror(errno));
2031 ret = CONFIG_NO_WRITE;
2032 goto out_free;
2033 }
2034
2035 if (store.seen == 0)
2036 store.seen = 1;
2037
2038 for (i = 0, copy_begin = 0; i < store.seen; i++) {
2039 if (store.offset[i] == 0) {
2040 store.offset[i] = copy_end = contents_sz;
2041 } else if (store.state != KEY_SEEN) {
2042 copy_end = store.offset[i];
2043 } else
2044 copy_end = find_beginning_of_line(
2045 contents, contents_sz,
2046 store.offset[i]-2, &new_line);
2047
2048 if (copy_end > 0 && contents[copy_end-1] != '\n')
2049 new_line = 1;
2050
2051 /* write the first part of the config */
2052 if (copy_end > copy_begin) {
2053 if (write_in_full(fd, contents + copy_begin,
2054 copy_end - copy_begin) <
2055 copy_end - copy_begin)
2056 goto write_err_out;
2057 if (new_line &&
2058 write_str_in_full(fd, "\n") != 1)
2059 goto write_err_out;
2060 }
2061 copy_begin = store.offset[i];
2062 }
2063
2064 /* write the pair (value == NULL means unset) */
2065 if (value != NULL) {
2066 if (store.state == START) {
2067 if (!store_write_section(fd, key))
2068 goto write_err_out;
2069 }
2070 if (!store_write_pair(fd, key, value))
2071 goto write_err_out;
2072 }
2073
2074 /* write the rest of the config */
2075 if (copy_begin < contents_sz)
2076 if (write_in_full(fd, contents + copy_begin,
2077 contents_sz - copy_begin) <
2078 contents_sz - copy_begin)
2079 goto write_err_out;
2080
2081 munmap(contents, contents_sz);
2082 }
2083
2084 if (commit_lock_file(lock) < 0) {
2085 error("could not commit config file %s", config_filename);
2086 ret = CONFIG_NO_WRITE;
2087 lock = NULL;
2088 goto out_free;
2089 }
2090
2091 /*
2092 * lock is committed, so don't try to roll it back below.
2093 * NOTE: Since lockfile.c keeps a linked list of all created
2094 * lock_file structures, it isn't safe to free(lock). It's
2095 * better to just leave it hanging around.
2096 */
2097 lock = NULL;
2098 ret = 0;
2099
2100 /* Invalidate the config cache */
2101 git_config_clear();
2102
2103 out_free:
2104 if (lock)
2105 rollback_lock_file(lock);
2106 free(filename_buf);
2107 return ret;
2108
2109 write_err_out:
2110 ret = write_error(lock->filename.buf);
2111 goto out_free;
2112
2113 }
2114
2115 int git_config_set_multivar(const char *key, const char *value,
2116 const char *value_regex, int multi_replace)
2117 {
2118 return git_config_set_multivar_in_file(NULL, key, value, value_regex,
2119 multi_replace);
2120 }
2121
2122 static int section_name_match (const char *buf, const char *name)
2123 {
2124 int i = 0, j = 0, dot = 0;
2125 if (buf[i] != '[')
2126 return 0;
2127 for (i = 1; buf[i] && buf[i] != ']'; i++) {
2128 if (!dot && isspace(buf[i])) {
2129 dot = 1;
2130 if (name[j++] != '.')
2131 break;
2132 for (i++; isspace(buf[i]); i++)
2133 ; /* do nothing */
2134 if (buf[i] != '"')
2135 break;
2136 continue;
2137 }
2138 if (buf[i] == '\\' && dot)
2139 i++;
2140 else if (buf[i] == '"' && dot) {
2141 for (i++; isspace(buf[i]); i++)
2142 ; /* do_nothing */
2143 break;
2144 }
2145 if (buf[i] != name[j++])
2146 break;
2147 }
2148 if (buf[i] == ']' && name[j] == 0) {
2149 /*
2150 * We match, now just find the right length offset by
2151 * gobbling up any whitespace after it, as well
2152 */
2153 i++;
2154 for (; buf[i] && isspace(buf[i]); i++)
2155 ; /* do nothing */
2156 return i;
2157 }
2158 return 0;
2159 }
2160
2161 static int section_name_is_ok(const char *name)
2162 {
2163 /* Empty section names are bogus. */
2164 if (!*name)
2165 return 0;
2166
2167 /*
2168 * Before a dot, we must be alphanumeric or dash. After the first dot,
2169 * anything goes, so we can stop checking.
2170 */
2171 for (; *name && *name != '.'; name++)
2172 if (*name != '-' && !isalnum(*name))
2173 return 0;
2174 return 1;
2175 }
2176
2177 /* if new_name == NULL, the section is removed instead */
2178 int git_config_rename_section_in_file(const char *config_filename,
2179 const char *old_name, const char *new_name)
2180 {
2181 int ret = 0, remove = 0;
2182 char *filename_buf = NULL;
2183 struct lock_file *lock;
2184 int out_fd;
2185 char buf[1024];
2186 FILE *config_file;
2187 struct stat st;
2188
2189 if (new_name && !section_name_is_ok(new_name)) {
2190 ret = error("invalid section name: %s", new_name);
2191 goto out;
2192 }
2193
2194 if (!config_filename)
2195 config_filename = filename_buf = git_pathdup("config");
2196
2197 lock = xcalloc(1, sizeof(struct lock_file));
2198 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
2199 if (out_fd < 0) {
2200 ret = error("could not lock config file %s", config_filename);
2201 goto out;
2202 }
2203
2204 if (!(config_file = fopen(config_filename, "rb"))) {
2205 /* no config file means nothing to rename, no error */
2206 goto unlock_and_out;
2207 }
2208
2209 fstat(fileno(config_file), &st);
2210
2211 if (chmod(lock->filename.buf, st.st_mode & 07777) < 0) {
2212 ret = error("chmod on %s failed: %s",
2213 lock->filename.buf, strerror(errno));
2214 goto out;
2215 }
2216
2217 while (fgets(buf, sizeof(buf), config_file)) {
2218 int i;
2219 int length;
2220 char *output = buf;
2221 for (i = 0; buf[i] && isspace(buf[i]); i++)
2222 ; /* do nothing */
2223 if (buf[i] == '[') {
2224 /* it's a section */
2225 int offset = section_name_match(&buf[i], old_name);
2226 if (offset > 0) {
2227 ret++;
2228 if (new_name == NULL) {
2229 remove = 1;
2230 continue;
2231 }
2232 store.baselen = strlen(new_name);
2233 if (!store_write_section(out_fd, new_name)) {
2234 ret = write_error(lock->filename.buf);
2235 goto out;
2236 }
2237 /*
2238 * We wrote out the new section, with
2239 * a newline, now skip the old
2240 * section's length
2241 */
2242 output += offset + i;
2243 if (strlen(output) > 0) {
2244 /*
2245 * More content means there's
2246 * a declaration to put on the
2247 * next line; indent with a
2248 * tab
2249 */
2250 output -= 1;
2251 output[0] = '\t';
2252 }
2253 }
2254 remove = 0;
2255 }
2256 if (remove)
2257 continue;
2258 length = strlen(output);
2259 if (write_in_full(out_fd, output, length) != length) {
2260 ret = write_error(lock->filename.buf);
2261 goto out;
2262 }
2263 }
2264 fclose(config_file);
2265 unlock_and_out:
2266 if (commit_lock_file(lock) < 0)
2267 ret = error("could not commit config file %s", config_filename);
2268 out:
2269 free(filename_buf);
2270 return ret;
2271 }
2272
2273 int git_config_rename_section(const char *old_name, const char *new_name)
2274 {
2275 return git_config_rename_section_in_file(NULL, old_name, new_name);
2276 }
2277
2278 /*
2279 * Call this to report error for your variable that should not
2280 * get a boolean value (i.e. "[my] var" means "true").
2281 */
2282 #undef config_error_nonbool
2283 int config_error_nonbool(const char *var)
2284 {
2285 return error("Missing value for '%s'", var);
2286 }
2287
2288 int parse_config_key(const char *var,
2289 const char *section,
2290 const char **subsection, int *subsection_len,
2291 const char **key)
2292 {
2293 int section_len = strlen(section);
2294 const char *dot;
2295
2296 /* Does it start with "section." ? */
2297 if (!starts_with(var, section) || var[section_len] != '.')
2298 return -1;
2299
2300 /*
2301 * Find the key; we don't know yet if we have a subsection, but we must
2302 * parse backwards from the end, since the subsection may have dots in
2303 * it, too.
2304 */
2305 dot = strrchr(var, '.');
2306 *key = dot + 1;
2307
2308 /* Did we have a subsection at all? */
2309 if (dot == var + section_len) {
2310 *subsection = NULL;
2311 *subsection_len = 0;
2312 }
2313 else {
2314 *subsection = var + section_len + 1;
2315 *subsection_len = dot - *subsection;
2316 }
2317
2318 return 0;
2319 }