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git-checkout.sh: use the $( ... ) construct for command substitution
[alt-git.git] / config.c
blob6821cef00a0da56fbdadbd34d179ba5bd125c3a6
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"
12
13 struct config_source {
14 struct config_source *prev;
15 union {
16 FILE *file;
17 struct config_buf {
18 const char *buf;
19 size_t len;
20 size_t pos;
21 } buf;
22 } u;
23 const char *name;
24 const char *path;
25 int die_on_error;
26 int linenr;
27 int eof;
28 struct strbuf value;
29 struct strbuf var;
30
31 int (*do_fgetc)(struct config_source *c);
32 int (*do_ungetc)(int c, struct config_source *conf);
33 long (*do_ftell)(struct config_source *c);
34 };
35
36 static struct config_source *cf;
37
38 static int zlib_compression_seen;
39
40 static int config_file_fgetc(struct config_source *conf)
41 {
42 return fgetc(conf->u.file);
43 }
44
45 static int config_file_ungetc(int c, struct config_source *conf)
46 {
47 return ungetc(c, conf->u.file);
48 }
49
50 static long config_file_ftell(struct config_source *conf)
51 {
52 return ftell(conf->u.file);
53 }
54
55
56 static int config_buf_fgetc(struct config_source *conf)
57 {
58 if (conf->u.buf.pos < conf->u.buf.len)
59 return conf->u.buf.buf[conf->u.buf.pos++];
60
61 return EOF;
62 }
63
64 static int config_buf_ungetc(int c, struct config_source *conf)
65 {
66 if (conf->u.buf.pos > 0)
67 return conf->u.buf.buf[--conf->u.buf.pos];
68
69 return EOF;
70 }
71
72 static long config_buf_ftell(struct config_source *conf)
73 {
74 return conf->u.buf.pos;
75 }
76
77 #define MAX_INCLUDE_DEPTH 10
78 static const char include_depth_advice[] =
79 "exceeded maximum include depth (%d) while including\n"
80 " %s\n"
81 "from\n"
82 " %s\n"
83 "Do you have circular includes?";
84 static int handle_path_include(const char *path, struct config_include_data *inc)
85 {
86 int ret = 0;
87 struct strbuf buf = STRBUF_INIT;
88 char *expanded;
89
90 if (!path)
91 return config_error_nonbool("include.path");
92
93 expanded = expand_user_path(path);
94 if (!expanded)
95 return error("Could not expand include path '%s'", path);
96 path = expanded;
97
98 /*
99 * Use an absolute path as-is, but interpret relative paths
100 * based on the including config file.
101 */
102 if (!is_absolute_path(path)) {
103 char *slash;
104
105 if (!cf || !cf->path)
106 return error("relative config includes must come from files");
107
108 slash = find_last_dir_sep(cf->path);
109 if (slash)
110 strbuf_add(&buf, cf->path, slash - cf->path + 1);
111 strbuf_addstr(&buf, path);
112 path = buf.buf;
113 }
114
115 if (!access_or_die(path, R_OK, 0)) {
116 if (++inc->depth > MAX_INCLUDE_DEPTH)
117 die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
118 cf && cf->name ? cf->name : "the command line");
119 ret = git_config_from_file(git_config_include, path, inc);
120 inc->depth--;
121 }
122 strbuf_release(&buf);
123 free(expanded);
124 return ret;
125 }
126
127 int git_config_include(const char *var, const char *value, void *data)
128 {
129 struct config_include_data *inc = data;
130 const char *type;
131 int ret;
132
133 /*
134 * Pass along all values, including "include" directives; this makes it
135 * possible to query information on the includes themselves.
136 */
137 ret = inc->fn(var, value, inc->data);
138 if (ret < 0)
139 return ret;
140
141 type = skip_prefix(var, "include.");
142 if (!type)
143 return ret;
144
145 if (!strcmp(type, "path"))
146 ret = handle_path_include(value, inc);
147 return ret;
148 }
149
150 static void lowercase(char *p)
151 {
152 for (; *p; p++)
153 *p = tolower(*p);
154 }
155
156 void git_config_push_parameter(const char *text)
157 {
158 struct strbuf env = STRBUF_INIT;
159 const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
160 if (old) {
161 strbuf_addstr(&env, old);
162 strbuf_addch(&env, ' ');
163 }
164 sq_quote_buf(&env, text);
165 setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
166 strbuf_release(&env);
167 }
168
169 int git_config_parse_parameter(const char *text,
170 config_fn_t fn, void *data)
171 {
172 struct strbuf **pair;
173 pair = strbuf_split_str(text, '=', 2);
174 if (!pair[0])
175 return error("bogus config parameter: %s", text);
176 if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
177 strbuf_setlen(pair[0], pair[0]->len - 1);
178 strbuf_trim(pair[0]);
179 if (!pair[0]->len) {
180 strbuf_list_free(pair);
181 return error("bogus config parameter: %s", text);
182 }
183 lowercase(pair[0]->buf);
184 if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
185 strbuf_list_free(pair);
186 return -1;
187 }
188 strbuf_list_free(pair);
189 return 0;
190 }
191
192 int git_config_from_parameters(config_fn_t fn, void *data)
193 {
194 const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
195 char *envw;
196 const char **argv = NULL;
197 int nr = 0, alloc = 0;
198 int i;
199
200 if (!env)
201 return 0;
202 /* sq_dequote will write over it */
203 envw = xstrdup(env);
204
205 if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
206 free(envw);
207 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
208 }
209
210 for (i = 0; i < nr; i++) {
211 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
212 free(argv);
213 free(envw);
214 return -1;
215 }
216 }
217
218 free(argv);
219 free(envw);
220 return nr > 0;
221 }
222
223 static int get_next_char(void)
224 {
225 int c = cf->do_fgetc(cf);
226
227 if (c == '\r') {
228 /* DOS like systems */
229 c = cf->do_fgetc(cf);
230 if (c != '\n') {
231 cf->do_ungetc(c, cf);
232 c = '\r';
233 }
234 }
235 if (c == '\n')
236 cf->linenr++;
237 if (c == EOF) {
238 cf->eof = 1;
239 c = '\n';
240 }
241 return c;
242 }
243
244 static char *parse_value(void)
245 {
246 int quote = 0, comment = 0, space = 0;
247
248 strbuf_reset(&cf->value);
249 for (;;) {
250 int c = get_next_char();
251 if (c == '\n') {
252 if (quote) {
253 cf->linenr--;
254 return NULL;
255 }
256 return cf->value.buf;
257 }
258 if (comment)
259 continue;
260 if (isspace(c) && !quote) {
261 if (cf->value.len)
262 space++;
263 continue;
264 }
265 if (!quote) {
266 if (c == ';' || c == '#') {
267 comment = 1;
268 continue;
269 }
270 }
271 for (; space; space--)
272 strbuf_addch(&cf->value, ' ');
273 if (c == '\\') {
274 c = get_next_char();
275 switch (c) {
276 case '\n':
277 continue;
278 case 't':
279 c = '\t';
280 break;
281 case 'b':
282 c = '\b';
283 break;
284 case 'n':
285 c = '\n';
286 break;
287 /* Some characters escape as themselves */
288 case '\\': case '"':
289 break;
290 /* Reject unknown escape sequences */
291 default:
292 return NULL;
293 }
294 strbuf_addch(&cf->value, c);
295 continue;
296 }
297 if (c == '"') {
298 quote = 1-quote;
299 continue;
300 }
301 strbuf_addch(&cf->value, c);
302 }
303 }
304
305 static inline int iskeychar(int c)
306 {
307 return isalnum(c) || c == '-';
308 }
309
310 static int get_value(config_fn_t fn, void *data, struct strbuf *name)
311 {
312 int c;
313 char *value;
314
315 /* Get the full name */
316 for (;;) {
317 c = get_next_char();
318 if (cf->eof)
319 break;
320 if (!iskeychar(c))
321 break;
322 strbuf_addch(name, tolower(c));
323 }
324
325 while (c == ' ' || c == '\t')
326 c = get_next_char();
327
328 value = NULL;
329 if (c != '\n') {
330 if (c != '=')
331 return -1;
332 value = parse_value();
333 if (!value)
334 return -1;
335 }
336 return fn(name->buf, value, data);
337 }
338
339 static int get_extended_base_var(struct strbuf *name, int c)
340 {
341 do {
342 if (c == '\n')
343 goto error_incomplete_line;
344 c = get_next_char();
345 } while (isspace(c));
346
347 /* We require the format to be '[base "extension"]' */
348 if (c != '"')
349 return -1;
350 strbuf_addch(name, '.');
351
352 for (;;) {
353 int c = get_next_char();
354 if (c == '\n')
355 goto error_incomplete_line;
356 if (c == '"')
357 break;
358 if (c == '\\') {
359 c = get_next_char();
360 if (c == '\n')
361 goto error_incomplete_line;
362 }
363 strbuf_addch(name, c);
364 }
365
366 /* Final ']' */
367 if (get_next_char() != ']')
368 return -1;
369 return 0;
370 error_incomplete_line:
371 cf->linenr--;
372 return -1;
373 }
374
375 static int get_base_var(struct strbuf *name)
376 {
377 for (;;) {
378 int c = get_next_char();
379 if (cf->eof)
380 return -1;
381 if (c == ']')
382 return 0;
383 if (isspace(c))
384 return get_extended_base_var(name, c);
385 if (!iskeychar(c) && c != '.')
386 return -1;
387 strbuf_addch(name, tolower(c));
388 }
389 }
390
391 static int git_parse_source(config_fn_t fn, void *data)
392 {
393 int comment = 0;
394 int baselen = 0;
395 struct strbuf *var = &cf->var;
396
397 /* U+FEFF Byte Order Mark in UTF8 */
398 static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
399 const unsigned char *bomptr = utf8_bom;
400
401 for (;;) {
402 int c = get_next_char();
403 if (bomptr && *bomptr) {
404 /* We are at the file beginning; skip UTF8-encoded BOM
405 * if present. Sane editors won't put this in on their
406 * own, but e.g. Windows Notepad will do it happily. */
407 if ((unsigned char) c == *bomptr) {
408 bomptr++;
409 continue;
410 } else {
411 /* Do not tolerate partial BOM. */
412 if (bomptr != utf8_bom)
413 break;
414 /* No BOM at file beginning. Cool. */
415 bomptr = NULL;
416 }
417 }
418 if (c == '\n') {
419 if (cf->eof)
420 return 0;
421 comment = 0;
422 continue;
423 }
424 if (comment || isspace(c))
425 continue;
426 if (c == '#' || c == ';') {
427 comment = 1;
428 continue;
429 }
430 if (c == '[') {
431 /* Reset prior to determining a new stem */
432 strbuf_reset(var);
433 if (get_base_var(var) < 0 || var->len < 1)
434 break;
435 strbuf_addch(var, '.');
436 baselen = var->len;
437 continue;
438 }
439 if (!isalpha(c))
440 break;
441 /*
442 * Truncate the var name back to the section header
443 * stem prior to grabbing the suffix part of the name
444 * and the value.
445 */
446 strbuf_setlen(var, baselen);
447 strbuf_addch(var, tolower(c));
448 if (get_value(fn, data, var) < 0)
449 break;
450 }
451 if (cf->die_on_error)
452 die("bad config file line %d in %s", cf->linenr, cf->name);
453 else
454 return error("bad config file line %d in %s", cf->linenr, cf->name);
455 }
456
457 static int parse_unit_factor(const char *end, uintmax_t *val)
458 {
459 if (!*end)
460 return 1;
461 else if (!strcasecmp(end, "k")) {
462 *val *= 1024;
463 return 1;
464 }
465 else if (!strcasecmp(end, "m")) {
466 *val *= 1024 * 1024;
467 return 1;
468 }
469 else if (!strcasecmp(end, "g")) {
470 *val *= 1024 * 1024 * 1024;
471 return 1;
472 }
473 return 0;
474 }
475
476 static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
477 {
478 if (value && *value) {
479 char *end;
480 intmax_t val;
481 uintmax_t uval;
482 uintmax_t factor = 1;
483
484 errno = 0;
485 val = strtoimax(value, &end, 0);
486 if (errno == ERANGE)
487 return 0;
488 if (!parse_unit_factor(end, &factor)) {
489 errno = EINVAL;
490 return 0;
491 }
492 uval = abs(val);
493 uval *= factor;
494 if (uval > max || abs(val) > uval) {
495 errno = ERANGE;
496 return 0;
497 }
498 val *= factor;
499 *ret = val;
500 return 1;
501 }
502 errno = EINVAL;
503 return 0;
504 }
505
506 static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
507 {
508 if (value && *value) {
509 char *end;
510 uintmax_t val;
511 uintmax_t oldval;
512
513 errno = 0;
514 val = strtoumax(value, &end, 0);
515 if (errno == ERANGE)
516 return 0;
517 oldval = val;
518 if (!parse_unit_factor(end, &val)) {
519 errno = EINVAL;
520 return 0;
521 }
522 if (val > max || oldval > val) {
523 errno = ERANGE;
524 return 0;
525 }
526 *ret = val;
527 return 1;
528 }
529 errno = EINVAL;
530 return 0;
531 }
532
533 static int git_parse_int(const char *value, int *ret)
534 {
535 intmax_t tmp;
536 if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
537 return 0;
538 *ret = tmp;
539 return 1;
540 }
541
542 static int git_parse_int64(const char *value, int64_t *ret)
543 {
544 intmax_t tmp;
545 if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
546 return 0;
547 *ret = tmp;
548 return 1;
549 }
550
551 int git_parse_ulong(const char *value, unsigned long *ret)
552 {
553 uintmax_t tmp;
554 if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
555 return 0;
556 *ret = tmp;
557 return 1;
558 }
559
560 static void die_bad_number(const char *name, const char *value)
561 {
562 const char *reason = errno == ERANGE ?
563 "out of range" :
564 "invalid unit";
565 if (!value)
566 value = "";
567
568 if (cf && cf->name)
569 die("bad numeric config value '%s' for '%s' in %s: %s",
570 value, name, cf->name, reason);
571 die("bad numeric config value '%s' for '%s': %s", value, name, reason);
572 }
573
574 int git_config_int(const char *name, const char *value)
575 {
576 int ret;
577 if (!git_parse_int(value, &ret))
578 die_bad_number(name, value);
579 return ret;
580 }
581
582 int64_t git_config_int64(const char *name, const char *value)
583 {
584 int64_t ret;
585 if (!git_parse_int64(value, &ret))
586 die_bad_number(name, value);
587 return ret;
588 }
589
590 unsigned long git_config_ulong(const char *name, const char *value)
591 {
592 unsigned long ret;
593 if (!git_parse_ulong(value, &ret))
594 die_bad_number(name, value);
595 return ret;
596 }
597
598 static int git_config_maybe_bool_text(const char *name, const char *value)
599 {
600 if (!value)
601 return 1;
602 if (!*value)
603 return 0;
604 if (!strcasecmp(value, "true")
605 || !strcasecmp(value, "yes")
606 || !strcasecmp(value, "on"))
607 return 1;
608 if (!strcasecmp(value, "false")
609 || !strcasecmp(value, "no")
610 || !strcasecmp(value, "off"))
611 return 0;
612 return -1;
613 }
614
615 int git_config_maybe_bool(const char *name, const char *value)
616 {
617 int v = git_config_maybe_bool_text(name, value);
618 if (0 <= v)
619 return v;
620 if (git_parse_int(value, &v))
621 return !!v;
622 return -1;
623 }
624
625 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
626 {
627 int v = git_config_maybe_bool_text(name, value);
628 if (0 <= v) {
629 *is_bool = 1;
630 return v;
631 }
632 *is_bool = 0;
633 return git_config_int(name, value);
634 }
635
636 int git_config_bool(const char *name, const char *value)
637 {
638 int discard;
639 return !!git_config_bool_or_int(name, value, &discard);
640 }
641
642 int git_config_string(const char **dest, const char *var, const char *value)
643 {
644 if (!value)
645 return config_error_nonbool(var);
646 *dest = xstrdup(value);
647 return 0;
648 }
649
650 int git_config_pathname(const char **dest, const char *var, const char *value)
651 {
652 if (!value)
653 return config_error_nonbool(var);
654 *dest = expand_user_path(value);
655 if (!*dest)
656 die("Failed to expand user dir in: '%s'", value);
657 return 0;
658 }
659
660 static int git_default_core_config(const char *var, const char *value)
661 {
662 /* This needs a better name */
663 if (!strcmp(var, "core.filemode")) {
664 trust_executable_bit = git_config_bool(var, value);
665 return 0;
666 }
667 if (!strcmp(var, "core.trustctime")) {
668 trust_ctime = git_config_bool(var, value);
669 return 0;
670 }
671 if (!strcmp(var, "core.checkstat")) {
672 if (!strcasecmp(value, "default"))
673 check_stat = 1;
674 else if (!strcasecmp(value, "minimal"))
675 check_stat = 0;
676 }
677
678 if (!strcmp(var, "core.quotepath")) {
679 quote_path_fully = git_config_bool(var, value);
680 return 0;
681 }
682
683 if (!strcmp(var, "core.symlinks")) {
684 has_symlinks = git_config_bool(var, value);
685 return 0;
686 }
687
688 if (!strcmp(var, "core.ignorecase")) {
689 ignore_case = git_config_bool(var, value);
690 return 0;
691 }
692
693 if (!strcmp(var, "core.attributesfile"))
694 return git_config_pathname(&git_attributes_file, var, value);
695
696 if (!strcmp(var, "core.bare")) {
697 is_bare_repository_cfg = git_config_bool(var, value);
698 return 0;
699 }
700
701 if (!strcmp(var, "core.ignorestat")) {
702 assume_unchanged = git_config_bool(var, value);
703 return 0;
704 }
705
706 if (!strcmp(var, "core.prefersymlinkrefs")) {
707 prefer_symlink_refs = git_config_bool(var, value);
708 return 0;
709 }
710
711 if (!strcmp(var, "core.logallrefupdates")) {
712 log_all_ref_updates = git_config_bool(var, value);
713 return 0;
714 }
715
716 if (!strcmp(var, "core.warnambiguousrefs")) {
717 warn_ambiguous_refs = git_config_bool(var, value);
718 return 0;
719 }
720
721 if (!strcmp(var, "core.abbrev")) {
722 int abbrev = git_config_int(var, value);
723 if (abbrev < minimum_abbrev || abbrev > 40)
724 return -1;
725 default_abbrev = abbrev;
726 return 0;
727 }
728
729 if (!strcmp(var, "core.loosecompression")) {
730 int level = git_config_int(var, value);
731 if (level == -1)
732 level = Z_DEFAULT_COMPRESSION;
733 else if (level < 0 || level > Z_BEST_COMPRESSION)
734 die("bad zlib compression level %d", level);
735 zlib_compression_level = level;
736 zlib_compression_seen = 1;
737 return 0;
738 }
739
740 if (!strcmp(var, "core.compression")) {
741 int level = git_config_int(var, value);
742 if (level == -1)
743 level = Z_DEFAULT_COMPRESSION;
744 else if (level < 0 || level > Z_BEST_COMPRESSION)
745 die("bad zlib compression level %d", level);
746 core_compression_level = level;
747 core_compression_seen = 1;
748 if (!zlib_compression_seen)
749 zlib_compression_level = level;
750 return 0;
751 }
752
753 if (!strcmp(var, "core.packedgitwindowsize")) {
754 int pgsz_x2 = getpagesize() * 2;
755 packed_git_window_size = git_config_ulong(var, value);
756
757 /* This value must be multiple of (pagesize * 2) */
758 packed_git_window_size /= pgsz_x2;
759 if (packed_git_window_size < 1)
760 packed_git_window_size = 1;
761 packed_git_window_size *= pgsz_x2;
762 return 0;
763 }
764
765 if (!strcmp(var, "core.bigfilethreshold")) {
766 big_file_threshold = git_config_ulong(var, value);
767 return 0;
768 }
769
770 if (!strcmp(var, "core.packedgitlimit")) {
771 packed_git_limit = git_config_ulong(var, value);
772 return 0;
773 }
774
775 if (!strcmp(var, "core.deltabasecachelimit")) {
776 delta_base_cache_limit = git_config_ulong(var, value);
777 return 0;
778 }
779
780 if (!strcmp(var, "core.autocrlf")) {
781 if (value && !strcasecmp(value, "input")) {
782 if (core_eol == EOL_CRLF)
783 return error("core.autocrlf=input conflicts with core.eol=crlf");
784 auto_crlf = AUTO_CRLF_INPUT;
785 return 0;
786 }
787 auto_crlf = git_config_bool(var, value);
788 return 0;
789 }
790
791 if (!strcmp(var, "core.safecrlf")) {
792 if (value && !strcasecmp(value, "warn")) {
793 safe_crlf = SAFE_CRLF_WARN;
794 return 0;
795 }
796 safe_crlf = git_config_bool(var, value);
797 return 0;
798 }
799
800 if (!strcmp(var, "core.eol")) {
801 if (value && !strcasecmp(value, "lf"))
802 core_eol = EOL_LF;
803 else if (value && !strcasecmp(value, "crlf"))
804 core_eol = EOL_CRLF;
805 else if (value && !strcasecmp(value, "native"))
806 core_eol = EOL_NATIVE;
807 else
808 core_eol = EOL_UNSET;
809 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
810 return error("core.autocrlf=input conflicts with core.eol=crlf");
811 return 0;
812 }
813
814 if (!strcmp(var, "core.notesref")) {
815 notes_ref_name = xstrdup(value);
816 return 0;
817 }
818
819 if (!strcmp(var, "core.pager"))
820 return git_config_string(&pager_program, var, value);
821
822 if (!strcmp(var, "core.editor"))
823 return git_config_string(&editor_program, var, value);
824
825 if (!strcmp(var, "core.commentchar")) {
826 const char *comment;
827 int ret = git_config_string(&comment, var, value);
828 if (!ret)
829 comment_line_char = comment[0];
830 return ret;
831 }
832
833 if (!strcmp(var, "core.askpass"))
834 return git_config_string(&askpass_program, var, value);
835
836 if (!strcmp(var, "core.excludesfile"))
837 return git_config_pathname(&excludes_file, var, value);
838
839 if (!strcmp(var, "core.whitespace")) {
840 if (!value)
841 return config_error_nonbool(var);
842 whitespace_rule_cfg = parse_whitespace_rule(value);
843 return 0;
844 }
845
846 if (!strcmp(var, "core.fsyncobjectfiles")) {
847 fsync_object_files = git_config_bool(var, value);
848 return 0;
849 }
850
851 if (!strcmp(var, "core.preloadindex")) {
852 core_preload_index = git_config_bool(var, value);
853 return 0;
854 }
855
856 if (!strcmp(var, "core.createobject")) {
857 if (!strcmp(value, "rename"))
858 object_creation_mode = OBJECT_CREATION_USES_RENAMES;
859 else if (!strcmp(value, "link"))
860 object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
861 else
862 die("Invalid mode for object creation: %s", value);
863 return 0;
864 }
865
866 if (!strcmp(var, "core.sparsecheckout")) {
867 core_apply_sparse_checkout = git_config_bool(var, value);
868 return 0;
869 }
870
871 if (!strcmp(var, "core.precomposeunicode")) {
872 precomposed_unicode = git_config_bool(var, value);
873 return 0;
874 }
875
876 /* Add other config variables here and to Documentation/config.txt. */
877 return 0;
878 }
879
880 static int git_default_i18n_config(const char *var, const char *value)
881 {
882 if (!strcmp(var, "i18n.commitencoding"))
883 return git_config_string(&git_commit_encoding, var, value);
884
885 if (!strcmp(var, "i18n.logoutputencoding"))
886 return git_config_string(&git_log_output_encoding, var, value);
887
888 /* Add other config variables here and to Documentation/config.txt. */
889 return 0;
890 }
891
892 static int git_default_branch_config(const char *var, const char *value)
893 {
894 if (!strcmp(var, "branch.autosetupmerge")) {
895 if (value && !strcasecmp(value, "always")) {
896 git_branch_track = BRANCH_TRACK_ALWAYS;
897 return 0;
898 }
899 git_branch_track = git_config_bool(var, value);
900 return 0;
901 }
902 if (!strcmp(var, "branch.autosetuprebase")) {
903 if (!value)
904 return config_error_nonbool(var);
905 else if (!strcmp(value, "never"))
906 autorebase = AUTOREBASE_NEVER;
907 else if (!strcmp(value, "local"))
908 autorebase = AUTOREBASE_LOCAL;
909 else if (!strcmp(value, "remote"))
910 autorebase = AUTOREBASE_REMOTE;
911 else if (!strcmp(value, "always"))
912 autorebase = AUTOREBASE_ALWAYS;
913 else
914 return error("Malformed value for %s", var);
915 return 0;
916 }
917
918 /* Add other config variables here and to Documentation/config.txt. */
919 return 0;
920 }
921
922 static int git_default_push_config(const char *var, const char *value)
923 {
924 if (!strcmp(var, "push.default")) {
925 if (!value)
926 return config_error_nonbool(var);
927 else if (!strcmp(value, "nothing"))
928 push_default = PUSH_DEFAULT_NOTHING;
929 else if (!strcmp(value, "matching"))
930 push_default = PUSH_DEFAULT_MATCHING;
931 else if (!strcmp(value, "simple"))
932 push_default = PUSH_DEFAULT_SIMPLE;
933 else if (!strcmp(value, "upstream"))
934 push_default = PUSH_DEFAULT_UPSTREAM;
935 else if (!strcmp(value, "tracking")) /* deprecated */
936 push_default = PUSH_DEFAULT_UPSTREAM;
937 else if (!strcmp(value, "current"))
938 push_default = PUSH_DEFAULT_CURRENT;
939 else {
940 error("Malformed value for %s: %s", var, value);
941 return error("Must be one of nothing, matching, simple, "
942 "upstream or current.");
943 }
944 return 0;
945 }
946
947 /* Add other config variables here and to Documentation/config.txt. */
948 return 0;
949 }
950
951 static int git_default_mailmap_config(const char *var, const char *value)
952 {
953 if (!strcmp(var, "mailmap.file"))
954 return git_config_string(&git_mailmap_file, var, value);
955 if (!strcmp(var, "mailmap.blob"))
956 return git_config_string(&git_mailmap_blob, var, value);
957
958 /* Add other config variables here and to Documentation/config.txt. */
959 return 0;
960 }
961
962 int git_default_config(const char *var, const char *value, void *dummy)
963 {
964 if (starts_with(var, "core."))
965 return git_default_core_config(var, value);
966
967 if (starts_with(var, "user."))
968 return git_ident_config(var, value, dummy);
969
970 if (starts_with(var, "i18n."))
971 return git_default_i18n_config(var, value);
972
973 if (starts_with(var, "branch."))
974 return git_default_branch_config(var, value);
975
976 if (starts_with(var, "push."))
977 return git_default_push_config(var, value);
978
979 if (starts_with(var, "mailmap."))
980 return git_default_mailmap_config(var, value);
981
982 if (starts_with(var, "advice."))
983 return git_default_advice_config(var, value);
984
985 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
986 pager_use_color = git_config_bool(var,value);
987 return 0;
988 }
989
990 if (!strcmp(var, "pack.packsizelimit")) {
991 pack_size_limit_cfg = git_config_ulong(var, value);
992 return 0;
993 }
994 /* Add other config variables here and to Documentation/config.txt. */
995 return 0;
996 }
997
998 /*
999 * All source specific fields in the union, die_on_error, name and the callbacks
1000 * fgetc, ungetc, ftell of top need to be initialized before calling
1001 * this function.
1002 */
1003 static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1004 {
1005 int ret;
1006
1007 /* push config-file parsing state stack */
1008 top->prev = cf;
1009 top->linenr = 1;
1010 top->eof = 0;
1011 strbuf_init(&top->value, 1024);
1012 strbuf_init(&top->var, 1024);
1013 cf = top;
1014
1015 ret = git_parse_source(fn, data);
1016
1017 /* pop config-file parsing state stack */
1018 strbuf_release(&top->value);
1019 strbuf_release(&top->var);
1020 cf = top->prev;
1021
1022 return ret;
1023 }
1024
1025 static int do_config_from_file(config_fn_t fn,
1026 const char *name, const char *path, FILE *f, void *data)
1027 {
1028 struct config_source top;
1029
1030 top.u.file = f;
1031 top.name = name;
1032 top.path = path;
1033 top.die_on_error = 1;
1034 top.do_fgetc = config_file_fgetc;
1035 top.do_ungetc = config_file_ungetc;
1036 top.do_ftell = config_file_ftell;
1037
1038 return do_config_from(&top, fn, data);
1039 }
1040
1041 static int git_config_from_stdin(config_fn_t fn, void *data)
1042 {
1043 return do_config_from_file(fn, "<stdin>", NULL, stdin, data);
1044 }
1045
1046 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1047 {
1048 int ret = -1;
1049 FILE *f;
1050
1051 f = fopen(filename, "r");
1052 if (f) {
1053 ret = do_config_from_file(fn, filename, filename, f, data);
1054 fclose(f);
1055 }
1056 return ret;
1057 }
1058
1059 int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1060 size_t len, void *data)
1061 {
1062 struct config_source top;
1063
1064 top.u.buf.buf = buf;
1065 top.u.buf.len = len;
1066 top.u.buf.pos = 0;
1067 top.name = name;
1068 top.path = NULL;
1069 top.die_on_error = 0;
1070 top.do_fgetc = config_buf_fgetc;
1071 top.do_ungetc = config_buf_ungetc;
1072 top.do_ftell = config_buf_ftell;
1073
1074 return do_config_from(&top, fn, data);
1075 }
1076
1077 static int git_config_from_blob_sha1(config_fn_t fn,
1078 const char *name,
1079 const unsigned char *sha1,
1080 void *data)
1081 {
1082 enum object_type type;
1083 char *buf;
1084 unsigned long size;
1085 int ret;
1086
1087 buf = read_sha1_file(sha1, &type, &size);
1088 if (!buf)
1089 return error("unable to load config blob object '%s'", name);
1090 if (type != OBJ_BLOB) {
1091 free(buf);
1092 return error("reference '%s' does not point to a blob", name);
1093 }
1094
1095 ret = git_config_from_buf(fn, name, buf, size, data);
1096 free(buf);
1097
1098 return ret;
1099 }
1100
1101 static int git_config_from_blob_ref(config_fn_t fn,
1102 const char *name,
1103 void *data)
1104 {
1105 unsigned char sha1[20];
1106
1107 if (get_sha1(name, sha1) < 0)
1108 return error("unable to resolve config blob '%s'", name);
1109 return git_config_from_blob_sha1(fn, name, sha1, data);
1110 }
1111
1112 const char *git_etc_gitconfig(void)
1113 {
1114 static const char *system_wide;
1115 if (!system_wide)
1116 system_wide = system_path(ETC_GITCONFIG);
1117 return system_wide;
1118 }
1119
1120 int git_env_bool(const char *k, int def)
1121 {
1122 const char *v = getenv(k);
1123 return v ? git_config_bool(k, v) : def;
1124 }
1125
1126 int git_config_system(void)
1127 {
1128 return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1129 }
1130
1131 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1132 {
1133 int ret = 0, found = 0;
1134 char *xdg_config = NULL;
1135 char *user_config = NULL;
1136
1137 home_config_paths(&user_config, &xdg_config, "config");
1138
1139 if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1140 ret += git_config_from_file(fn, git_etc_gitconfig(),
1141 data);
1142 found += 1;
1143 }
1144
1145 if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1146 ret += git_config_from_file(fn, xdg_config, data);
1147 found += 1;
1148 }
1149
1150 if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1151 ret += git_config_from_file(fn, user_config, data);
1152 found += 1;
1153 }
1154
1155 if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1156 ret += git_config_from_file(fn, repo_config, data);
1157 found += 1;
1158 }
1159
1160 switch (git_config_from_parameters(fn, data)) {
1161 case -1: /* error */
1162 die("unable to parse command-line config");
1163 break;
1164 case 0: /* found nothing */
1165 break;
1166 default: /* found at least one item */
1167 found++;
1168 break;
1169 }
1170
1171 free(xdg_config);
1172 free(user_config);
1173 return ret == 0 ? found : ret;
1174 }
1175
1176 int git_config_with_options(config_fn_t fn, void *data,
1177 struct git_config_source *config_source,
1178 int respect_includes)
1179 {
1180 char *repo_config = NULL;
1181 int ret;
1182 struct config_include_data inc = CONFIG_INCLUDE_INIT;
1183
1184 if (respect_includes) {
1185 inc.fn = fn;
1186 inc.data = data;
1187 fn = git_config_include;
1188 data = &inc;
1189 }
1190
1191 /*
1192 * If we have a specific filename, use it. Otherwise, follow the
1193 * regular lookup sequence.
1194 */
1195 if (config_source && config_source->use_stdin)
1196 return git_config_from_stdin(fn, data);
1197 else if (config_source && config_source->file)
1198 return git_config_from_file(fn, config_source->file, data);
1199 else if (config_source && config_source->blob)
1200 return git_config_from_blob_ref(fn, config_source->blob, data);
1201
1202 repo_config = git_pathdup("config");
1203 ret = git_config_early(fn, data, repo_config);
1204 if (repo_config)
1205 free(repo_config);
1206 return ret;
1207 }
1208
1209 int git_config(config_fn_t fn, void *data)
1210 {
1211 return git_config_with_options(fn, data, NULL, 1);
1212 }
1213
1214 /*
1215 * Find all the stuff for git_config_set() below.
1216 */
1217
1218 static struct {
1219 int baselen;
1220 char *key;
1221 int do_not_match;
1222 regex_t *value_regex;
1223 int multi_replace;
1224 size_t *offset;
1225 unsigned int offset_alloc;
1226 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1227 int seen;
1228 } store;
1229
1230 static int matches(const char *key, const char *value)
1231 {
1232 return !strcmp(key, store.key) &&
1233 (store.value_regex == NULL ||
1234 (store.do_not_match ^
1235 !regexec(store.value_regex, value, 0, NULL, 0)));
1236 }
1237
1238 static int store_aux(const char *key, const char *value, void *cb)
1239 {
1240 const char *ep;
1241 size_t section_len;
1242
1243 switch (store.state) {
1244 case KEY_SEEN:
1245 if (matches(key, value)) {
1246 if (store.seen == 1 && store.multi_replace == 0) {
1247 warning("%s has multiple values", key);
1248 }
1249
1250 ALLOC_GROW(store.offset, store.seen + 1,
1251 store.offset_alloc);
1252
1253 store.offset[store.seen] = cf->do_ftell(cf);
1254 store.seen++;
1255 }
1256 break;
1257 case SECTION_SEEN:
1258 /*
1259 * What we are looking for is in store.key (both
1260 * section and var), and its section part is baselen
1261 * long. We found key (again, both section and var).
1262 * We would want to know if this key is in the same
1263 * section as what we are looking for. We already
1264 * know we are in the same section as what should
1265 * hold store.key.
1266 */
1267 ep = strrchr(key, '.');
1268 section_len = ep - key;
1269
1270 if ((section_len != store.baselen) ||
1271 memcmp(key, store.key, section_len+1)) {
1272 store.state = SECTION_END_SEEN;
1273 break;
1274 }
1275
1276 /*
1277 * Do not increment matches: this is no match, but we
1278 * just made sure we are in the desired section.
1279 */
1280 ALLOC_GROW(store.offset, store.seen + 1,
1281 store.offset_alloc);
1282 store.offset[store.seen] = cf->do_ftell(cf);
1283 /* fallthru */
1284 case SECTION_END_SEEN:
1285 case START:
1286 if (matches(key, value)) {
1287 ALLOC_GROW(store.offset, store.seen + 1,
1288 store.offset_alloc);
1289 store.offset[store.seen] = cf->do_ftell(cf);
1290 store.state = KEY_SEEN;
1291 store.seen++;
1292 } else {
1293 if (strrchr(key, '.') - key == store.baselen &&
1294 !strncmp(key, store.key, store.baselen)) {
1295 store.state = SECTION_SEEN;
1296 ALLOC_GROW(store.offset,
1297 store.seen + 1,
1298 store.offset_alloc);
1299 store.offset[store.seen] = cf->do_ftell(cf);
1300 }
1301 }
1302 }
1303 return 0;
1304 }
1305
1306 static int write_error(const char *filename)
1307 {
1308 error("failed to write new configuration file %s", filename);
1309
1310 /* Same error code as "failed to rename". */
1311 return 4;
1312 }
1313
1314 static int store_write_section(int fd, const char *key)
1315 {
1316 const char *dot;
1317 int i, success;
1318 struct strbuf sb = STRBUF_INIT;
1319
1320 dot = memchr(key, '.', store.baselen);
1321 if (dot) {
1322 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1323 for (i = dot - key + 1; i < store.baselen; i++) {
1324 if (key[i] == '"' || key[i] == '\\')
1325 strbuf_addch(&sb, '\\');
1326 strbuf_addch(&sb, key[i]);
1327 }
1328 strbuf_addstr(&sb, "\"]\n");
1329 } else {
1330 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1331 }
1332
1333 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1334 strbuf_release(&sb);
1335
1336 return success;
1337 }
1338
1339 static int store_write_pair(int fd, const char *key, const char *value)
1340 {
1341 int i, success;
1342 int length = strlen(key + store.baselen + 1);
1343 const char *quote = "";
1344 struct strbuf sb = STRBUF_INIT;
1345
1346 /*
1347 * Check to see if the value needs to be surrounded with a dq pair.
1348 * Note that problematic characters are always backslash-quoted; this
1349 * check is about not losing leading or trailing SP and strings that
1350 * follow beginning-of-comment characters (i.e. ';' and '#') by the
1351 * configuration parser.
1352 */
1353 if (value[0] == ' ')
1354 quote = "\"";
1355 for (i = 0; value[i]; i++)
1356 if (value[i] == ';' || value[i] == '#')
1357 quote = "\"";
1358 if (i && value[i - 1] == ' ')
1359 quote = "\"";
1360
1361 strbuf_addf(&sb, "\t%.*s = %s",
1362 length, key + store.baselen + 1, quote);
1363
1364 for (i = 0; value[i]; i++)
1365 switch (value[i]) {
1366 case '\n':
1367 strbuf_addstr(&sb, "\\n");
1368 break;
1369 case '\t':
1370 strbuf_addstr(&sb, "\\t");
1371 break;
1372 case '"':
1373 case '\\':
1374 strbuf_addch(&sb, '\\');
1375 default:
1376 strbuf_addch(&sb, value[i]);
1377 break;
1378 }
1379 strbuf_addf(&sb, "%s\n", quote);
1380
1381 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1382 strbuf_release(&sb);
1383
1384 return success;
1385 }
1386
1387 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1388 size_t offset_, int *found_bracket)
1389 {
1390 size_t equal_offset = size, bracket_offset = size;
1391 ssize_t offset;
1392
1393 contline:
1394 for (offset = offset_-2; offset > 0
1395 && contents[offset] != '\n'; offset--)
1396 switch (contents[offset]) {
1397 case '=': equal_offset = offset; break;
1398 case ']': bracket_offset = offset; break;
1399 }
1400 if (offset > 0 && contents[offset-1] == '\\') {
1401 offset_ = offset;
1402 goto contline;
1403 }
1404 if (bracket_offset < equal_offset) {
1405 *found_bracket = 1;
1406 offset = bracket_offset+1;
1407 } else
1408 offset++;
1409
1410 return offset;
1411 }
1412
1413 int git_config_set_in_file(const char *config_filename,
1414 const char *key, const char *value)
1415 {
1416 return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1417 }
1418
1419 int git_config_set(const char *key, const char *value)
1420 {
1421 return git_config_set_multivar(key, value, NULL, 0);
1422 }
1423
1424 /*
1425 * Auxiliary function to sanity-check and split the key into the section
1426 * identifier and variable name.
1427 *
1428 * Returns 0 on success, -1 when there is an invalid character in the key and
1429 * -2 if there is no section name in the key.
1430 *
1431 * store_key - pointer to char* which will hold a copy of the key with
1432 * lowercase section and variable name
1433 * baselen - pointer to int which will hold the length of the
1434 * section + subsection part, can be NULL
1435 */
1436 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1437 {
1438 int i, dot, baselen;
1439 const char *last_dot = strrchr(key, '.');
1440
1441 /*
1442 * Since "key" actually contains the section name and the real
1443 * key name separated by a dot, we have to know where the dot is.
1444 */
1445
1446 if (last_dot == NULL || last_dot == key) {
1447 error("key does not contain a section: %s", key);
1448 return -CONFIG_NO_SECTION_OR_NAME;
1449 }
1450
1451 if (!last_dot[1]) {
1452 error("key does not contain variable name: %s", key);
1453 return -CONFIG_NO_SECTION_OR_NAME;
1454 }
1455
1456 baselen = last_dot - key;
1457 if (baselen_)
1458 *baselen_ = baselen;
1459
1460 /*
1461 * Validate the key and while at it, lower case it for matching.
1462 */
1463 *store_key = xmalloc(strlen(key) + 1);
1464
1465 dot = 0;
1466 for (i = 0; key[i]; i++) {
1467 unsigned char c = key[i];
1468 if (c == '.')
1469 dot = 1;
1470 /* Leave the extended basename untouched.. */
1471 if (!dot || i > baselen) {
1472 if (!iskeychar(c) ||
1473 (i == baselen + 1 && !isalpha(c))) {
1474 error("invalid key: %s", key);
1475 goto out_free_ret_1;
1476 }
1477 c = tolower(c);
1478 } else if (c == '\n') {
1479 error("invalid key (newline): %s", key);
1480 goto out_free_ret_1;
1481 }
1482 (*store_key)[i] = c;
1483 }
1484 (*store_key)[i] = 0;
1485
1486 return 0;
1487
1488 out_free_ret_1:
1489 free(*store_key);
1490 *store_key = NULL;
1491 return -CONFIG_INVALID_KEY;
1492 }
1493
1494 /*
1495 * If value==NULL, unset in (remove from) config,
1496 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1497 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1498 * else all matching key/values (regardless how many) are removed,
1499 * before the new pair is written.
1500 *
1501 * Returns 0 on success.
1502 *
1503 * This function does this:
1504 *
1505 * - it locks the config file by creating ".git/config.lock"
1506 *
1507 * - it then parses the config using store_aux() as validator to find
1508 * the position on the key/value pair to replace. If it is to be unset,
1509 * it must be found exactly once.
1510 *
1511 * - the config file is mmap()ed and the part before the match (if any) is
1512 * written to the lock file, then the changed part and the rest.
1513 *
1514 * - the config file is removed and the lock file rename()d to it.
1515 *
1516 */
1517 int git_config_set_multivar_in_file(const char *config_filename,
1518 const char *key, const char *value,
1519 const char *value_regex, int multi_replace)
1520 {
1521 int fd = -1, in_fd;
1522 int ret;
1523 struct lock_file *lock = NULL;
1524 char *filename_buf = NULL;
1525
1526 /* parse-key returns negative; flip the sign to feed exit(3) */
1527 ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1528 if (ret)
1529 goto out_free;
1530
1531 store.multi_replace = multi_replace;
1532
1533 if (!config_filename)
1534 config_filename = filename_buf = git_pathdup("config");
1535
1536 /*
1537 * The lock serves a purpose in addition to locking: the new
1538 * contents of .git/config will be written into it.
1539 */
1540 lock = xcalloc(sizeof(struct lock_file), 1);
1541 fd = hold_lock_file_for_update(lock, config_filename, 0);
1542 if (fd < 0) {
1543 error("could not lock config file %s: %s", config_filename, strerror(errno));
1544 free(store.key);
1545 ret = CONFIG_NO_LOCK;
1546 goto out_free;
1547 }
1548
1549 /*
1550 * If .git/config does not exist yet, write a minimal version.
1551 */
1552 in_fd = open(config_filename, O_RDONLY);
1553 if ( in_fd < 0 ) {
1554 free(store.key);
1555
1556 if ( ENOENT != errno ) {
1557 error("opening %s: %s", config_filename,
1558 strerror(errno));
1559 ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1560 goto out_free;
1561 }
1562 /* if nothing to unset, error out */
1563 if (value == NULL) {
1564 ret = CONFIG_NOTHING_SET;
1565 goto out_free;
1566 }
1567
1568 store.key = (char *)key;
1569 if (!store_write_section(fd, key) ||
1570 !store_write_pair(fd, key, value))
1571 goto write_err_out;
1572 } else {
1573 struct stat st;
1574 char *contents;
1575 size_t contents_sz, copy_begin, copy_end;
1576 int i, new_line = 0;
1577
1578 if (value_regex == NULL)
1579 store.value_regex = NULL;
1580 else {
1581 if (value_regex[0] == '!') {
1582 store.do_not_match = 1;
1583 value_regex++;
1584 } else
1585 store.do_not_match = 0;
1586
1587 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1588 if (regcomp(store.value_regex, value_regex,
1589 REG_EXTENDED)) {
1590 error("invalid pattern: %s", value_regex);
1591 free(store.value_regex);
1592 ret = CONFIG_INVALID_PATTERN;
1593 goto out_free;
1594 }
1595 }
1596
1597 ALLOC_GROW(store.offset, 1, store.offset_alloc);
1598 store.offset[0] = 0;
1599 store.state = START;
1600 store.seen = 0;
1601
1602 /*
1603 * After this, store.offset will contain the *end* offset
1604 * of the last match, or remain at 0 if no match was found.
1605 * As a side effect, we make sure to transform only a valid
1606 * existing config file.
1607 */
1608 if (git_config_from_file(store_aux, config_filename, NULL)) {
1609 error("invalid config file %s", config_filename);
1610 free(store.key);
1611 if (store.value_regex != NULL) {
1612 regfree(store.value_regex);
1613 free(store.value_regex);
1614 }
1615 ret = CONFIG_INVALID_FILE;
1616 goto out_free;
1617 }
1618
1619 free(store.key);
1620 if (store.value_regex != NULL) {
1621 regfree(store.value_regex);
1622 free(store.value_regex);
1623 }
1624
1625 /* if nothing to unset, or too many matches, error out */
1626 if ((store.seen == 0 && value == NULL) ||
1627 (store.seen > 1 && multi_replace == 0)) {
1628 ret = CONFIG_NOTHING_SET;
1629 goto out_free;
1630 }
1631
1632 fstat(in_fd, &st);
1633 contents_sz = xsize_t(st.st_size);
1634 contents = xmmap(NULL, contents_sz, PROT_READ,
1635 MAP_PRIVATE, in_fd, 0);
1636 close(in_fd);
1637
1638 if (store.seen == 0)
1639 store.seen = 1;
1640
1641 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1642 if (store.offset[i] == 0) {
1643 store.offset[i] = copy_end = contents_sz;
1644 } else if (store.state != KEY_SEEN) {
1645 copy_end = store.offset[i];
1646 } else
1647 copy_end = find_beginning_of_line(
1648 contents, contents_sz,
1649 store.offset[i]-2, &new_line);
1650
1651 if (copy_end > 0 && contents[copy_end-1] != '\n')
1652 new_line = 1;
1653
1654 /* write the first part of the config */
1655 if (copy_end > copy_begin) {
1656 if (write_in_full(fd, contents + copy_begin,
1657 copy_end - copy_begin) <
1658 copy_end - copy_begin)
1659 goto write_err_out;
1660 if (new_line &&
1661 write_str_in_full(fd, "\n") != 1)
1662 goto write_err_out;
1663 }
1664 copy_begin = store.offset[i];
1665 }
1666
1667 /* write the pair (value == NULL means unset) */
1668 if (value != NULL) {
1669 if (store.state == START) {
1670 if (!store_write_section(fd, key))
1671 goto write_err_out;
1672 }
1673 if (!store_write_pair(fd, key, value))
1674 goto write_err_out;
1675 }
1676
1677 /* write the rest of the config */
1678 if (copy_begin < contents_sz)
1679 if (write_in_full(fd, contents + copy_begin,
1680 contents_sz - copy_begin) <
1681 contents_sz - copy_begin)
1682 goto write_err_out;
1683
1684 munmap(contents, contents_sz);
1685 }
1686
1687 if (commit_lock_file(lock) < 0) {
1688 error("could not commit config file %s", config_filename);
1689 ret = CONFIG_NO_WRITE;
1690 goto out_free;
1691 }
1692
1693 /*
1694 * lock is committed, so don't try to roll it back below.
1695 * NOTE: Since lockfile.c keeps a linked list of all created
1696 * lock_file structures, it isn't safe to free(lock). It's
1697 * better to just leave it hanging around.
1698 */
1699 lock = NULL;
1700 ret = 0;
1701
1702 out_free:
1703 if (lock)
1704 rollback_lock_file(lock);
1705 free(filename_buf);
1706 return ret;
1707
1708 write_err_out:
1709 ret = write_error(lock->filename);
1710 goto out_free;
1711
1712 }
1713
1714 int git_config_set_multivar(const char *key, const char *value,
1715 const char *value_regex, int multi_replace)
1716 {
1717 return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1718 multi_replace);
1719 }
1720
1721 static int section_name_match (const char *buf, const char *name)
1722 {
1723 int i = 0, j = 0, dot = 0;
1724 if (buf[i] != '[')
1725 return 0;
1726 for (i = 1; buf[i] && buf[i] != ']'; i++) {
1727 if (!dot && isspace(buf[i])) {
1728 dot = 1;
1729 if (name[j++] != '.')
1730 break;
1731 for (i++; isspace(buf[i]); i++)
1732 ; /* do nothing */
1733 if (buf[i] != '"')
1734 break;
1735 continue;
1736 }
1737 if (buf[i] == '\\' && dot)
1738 i++;
1739 else if (buf[i] == '"' && dot) {
1740 for (i++; isspace(buf[i]); i++)
1741 ; /* do_nothing */
1742 break;
1743 }
1744 if (buf[i] != name[j++])
1745 break;
1746 }
1747 if (buf[i] == ']' && name[j] == 0) {
1748 /*
1749 * We match, now just find the right length offset by
1750 * gobbling up any whitespace after it, as well
1751 */
1752 i++;
1753 for (; buf[i] && isspace(buf[i]); i++)
1754 ; /* do nothing */
1755 return i;
1756 }
1757 return 0;
1758 }
1759
1760 static int section_name_is_ok(const char *name)
1761 {
1762 /* Empty section names are bogus. */
1763 if (!*name)
1764 return 0;
1765
1766 /*
1767 * Before a dot, we must be alphanumeric or dash. After the first dot,
1768 * anything goes, so we can stop checking.
1769 */
1770 for (; *name && *name != '.'; name++)
1771 if (*name != '-' && !isalnum(*name))
1772 return 0;
1773 return 1;
1774 }
1775
1776 /* if new_name == NULL, the section is removed instead */
1777 int git_config_rename_section_in_file(const char *config_filename,
1778 const char *old_name, const char *new_name)
1779 {
1780 int ret = 0, remove = 0;
1781 char *filename_buf = NULL;
1782 struct lock_file *lock;
1783 int out_fd;
1784 char buf[1024];
1785 FILE *config_file;
1786
1787 if (new_name && !section_name_is_ok(new_name)) {
1788 ret = error("invalid section name: %s", new_name);
1789 goto out;
1790 }
1791
1792 if (!config_filename)
1793 config_filename = filename_buf = git_pathdup("config");
1794
1795 lock = xcalloc(sizeof(struct lock_file), 1);
1796 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1797 if (out_fd < 0) {
1798 ret = error("could not lock config file %s", config_filename);
1799 goto out;
1800 }
1801
1802 if (!(config_file = fopen(config_filename, "rb"))) {
1803 /* no config file means nothing to rename, no error */
1804 goto unlock_and_out;
1805 }
1806
1807 while (fgets(buf, sizeof(buf), config_file)) {
1808 int i;
1809 int length;
1810 char *output = buf;
1811 for (i = 0; buf[i] && isspace(buf[i]); i++)
1812 ; /* do nothing */
1813 if (buf[i] == '[') {
1814 /* it's a section */
1815 int offset = section_name_match(&buf[i], old_name);
1816 if (offset > 0) {
1817 ret++;
1818 if (new_name == NULL) {
1819 remove = 1;
1820 continue;
1821 }
1822 store.baselen = strlen(new_name);
1823 if (!store_write_section(out_fd, new_name)) {
1824 ret = write_error(lock->filename);
1825 goto out;
1826 }
1827 /*
1828 * We wrote out the new section, with
1829 * a newline, now skip the old
1830 * section's length
1831 */
1832 output += offset + i;
1833 if (strlen(output) > 0) {
1834 /*
1835 * More content means there's
1836 * a declaration to put on the
1837 * next line; indent with a
1838 * tab
1839 */
1840 output -= 1;
1841 output[0] = '\t';
1842 }
1843 }
1844 remove = 0;
1845 }
1846 if (remove)
1847 continue;
1848 length = strlen(output);
1849 if (write_in_full(out_fd, output, length) != length) {
1850 ret = write_error(lock->filename);
1851 goto out;
1852 }
1853 }
1854 fclose(config_file);
1855 unlock_and_out:
1856 if (commit_lock_file(lock) < 0)
1857 ret = error("could not commit config file %s", config_filename);
1858 out:
1859 free(filename_buf);
1860 return ret;
1861 }
1862
1863 int git_config_rename_section(const char *old_name, const char *new_name)
1864 {
1865 return git_config_rename_section_in_file(NULL, old_name, new_name);
1866 }
1867
1868 /*
1869 * Call this to report error for your variable that should not
1870 * get a boolean value (i.e. "[my] var" means "true").
1871 */
1872 #undef config_error_nonbool
1873 int config_error_nonbool(const char *var)
1874 {
1875 return error("Missing value for '%s'", var);
1876 }
1877
1878 int parse_config_key(const char *var,
1879 const char *section,
1880 const char **subsection, int *subsection_len,
1881 const char **key)
1882 {
1883 int section_len = strlen(section);
1884 const char *dot;
1885
1886 /* Does it start with "section." ? */
1887 if (!starts_with(var, section) || var[section_len] != '.')
1888 return -1;
1889
1890 /*
1891 * Find the key; we don't know yet if we have a subsection, but we must
1892 * parse backwards from the end, since the subsection may have dots in
1893 * it, too.
1894 */
1895 dot = strrchr(var, '.');
1896 *key = dot + 1;
1897
1898 /* Did we have a subsection at all? */
1899 if (dot == var + section_len) {
1900 *subsection = NULL;
1901 *subsection_len = 0;
1902 }
1903 else {
1904 *subsection = var + section_len + 1;
1905 *subsection_len = dot - *subsection;
1906 }
1907
1908 return 0;
1909 }
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