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daemon: sanitize incoming virtual hostname
[git/mingw.git] / config.c
blob73d8205ae401a8ffc18c37a9bf91d96407f7222d
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 if (!skip_prefix(var, "include.", &type))
142 return ret;
143
144 if (!strcmp(type, "path"))
145 ret = handle_path_include(value, inc);
146 return ret;
147 }
148
149 void git_config_push_parameter(const char *text)
150 {
151 struct strbuf env = STRBUF_INIT;
152 const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
153 if (old) {
154 strbuf_addstr(&env, old);
155 strbuf_addch(&env, ' ');
156 }
157 sq_quote_buf(&env, text);
158 setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
159 strbuf_release(&env);
160 }
161
162 int git_config_parse_parameter(const char *text,
163 config_fn_t fn, void *data)
164 {
165 const char *value;
166 struct strbuf **pair;
167
168 pair = strbuf_split_str(text, '=', 2);
169 if (!pair[0])
170 return error("bogus config parameter: %s", text);
171
172 if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {
173 strbuf_setlen(pair[0], pair[0]->len - 1);
174 value = pair[1] ? pair[1]->buf : "";
175 } else {
176 value = NULL;
177 }
178
179 strbuf_trim(pair[0]);
180 if (!pair[0]->len) {
181 strbuf_list_free(pair);
182 return error("bogus config parameter: %s", text);
183 }
184 strbuf_tolower(pair[0]);
185 if (fn(pair[0]->buf, value, data) < 0) {
186 strbuf_list_free(pair);
187 return -1;
188 }
189 strbuf_list_free(pair);
190 return 0;
191 }
192
193 int git_config_from_parameters(config_fn_t fn, void *data)
194 {
195 const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
196 char *envw;
197 const char **argv = NULL;
198 int nr = 0, alloc = 0;
199 int i;
200
201 if (!env)
202 return 0;
203 /* sq_dequote will write over it */
204 envw = xstrdup(env);
205
206 if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
207 free(envw);
208 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
209 }
210
211 for (i = 0; i < nr; i++) {
212 if (git_config_parse_parameter(argv[i], fn, data) < 0) {
213 free(argv);
214 free(envw);
215 return -1;
216 }
217 }
218
219 free(argv);
220 free(envw);
221 return nr > 0;
222 }
223
224 static int get_next_char(void)
225 {
226 int c = cf->do_fgetc(cf);
227
228 if (c == '\r') {
229 /* DOS like systems */
230 c = cf->do_fgetc(cf);
231 if (c != '\n') {
232 cf->do_ungetc(c, cf);
233 c = '\r';
234 }
235 }
236 if (c == '\n')
237 cf->linenr++;
238 if (c == EOF) {
239 cf->eof = 1;
240 c = '\n';
241 }
242 return c;
243 }
244
245 static char *parse_value(void)
246 {
247 int quote = 0, comment = 0, space = 0;
248
249 strbuf_reset(&cf->value);
250 for (;;) {
251 int c = get_next_char();
252 if (c == '\n') {
253 if (quote) {
254 cf->linenr--;
255 return NULL;
256 }
257 return cf->value.buf;
258 }
259 if (comment)
260 continue;
261 if (isspace(c) && !quote) {
262 if (cf->value.len)
263 space++;
264 continue;
265 }
266 if (!quote) {
267 if (c == ';' || c == '#') {
268 comment = 1;
269 continue;
270 }
271 }
272 for (; space; space--)
273 strbuf_addch(&cf->value, ' ');
274 if (c == '\\') {
275 c = get_next_char();
276 switch (c) {
277 case '\n':
278 continue;
279 case 't':
280 c = '\t';
281 break;
282 case 'b':
283 c = '\b';
284 break;
285 case 'n':
286 c = '\n';
287 break;
288 /* Some characters escape as themselves */
289 case '\\': case '"':
290 break;
291 /* Reject unknown escape sequences */
292 default:
293 return NULL;
294 }
295 strbuf_addch(&cf->value, c);
296 continue;
297 }
298 if (c == '"') {
299 quote = 1-quote;
300 continue;
301 }
302 strbuf_addch(&cf->value, c);
303 }
304 }
305
306 static inline int iskeychar(int c)
307 {
308 return isalnum(c) || c == '-';
309 }
310
311 static int get_value(config_fn_t fn, void *data, struct strbuf *name)
312 {
313 int c;
314 char *value;
315
316 /* Get the full name */
317 for (;;) {
318 c = get_next_char();
319 if (cf->eof)
320 break;
321 if (!iskeychar(c))
322 break;
323 strbuf_addch(name, tolower(c));
324 }
325
326 while (c == ' ' || c == '\t')
327 c = get_next_char();
328
329 value = NULL;
330 if (c != '\n') {
331 if (c != '=')
332 return -1;
333 value = parse_value();
334 if (!value)
335 return -1;
336 }
337 return fn(name->buf, value, data);
338 }
339
340 static int get_extended_base_var(struct strbuf *name, int c)
341 {
342 do {
343 if (c == '\n')
344 goto error_incomplete_line;
345 c = get_next_char();
346 } while (isspace(c));
347
348 /* We require the format to be '[base "extension"]' */
349 if (c != '"')
350 return -1;
351 strbuf_addch(name, '.');
352
353 for (;;) {
354 int c = get_next_char();
355 if (c == '\n')
356 goto error_incomplete_line;
357 if (c == '"')
358 break;
359 if (c == '\\') {
360 c = get_next_char();
361 if (c == '\n')
362 goto error_incomplete_line;
363 }
364 strbuf_addch(name, c);
365 }
366
367 /* Final ']' */
368 if (get_next_char() != ']')
369 return -1;
370 return 0;
371 error_incomplete_line:
372 cf->linenr--;
373 return -1;
374 }
375
376 static int get_base_var(struct strbuf *name)
377 {
378 for (;;) {
379 int c = get_next_char();
380 if (cf->eof)
381 return -1;
382 if (c == ']')
383 return 0;
384 if (isspace(c))
385 return get_extended_base_var(name, c);
386 if (!iskeychar(c) && c != '.')
387 return -1;
388 strbuf_addch(name, tolower(c));
389 }
390 }
391
392 static int git_parse_source(config_fn_t fn, void *data)
393 {
394 int comment = 0;
395 int baselen = 0;
396 struct strbuf *var = &cf->var;
397
398 /* U+FEFF Byte Order Mark in UTF8 */
399 static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
400 const unsigned char *bomptr = utf8_bom;
401
402 for (;;) {
403 int c = get_next_char();
404 if (bomptr && *bomptr) {
405 /* We are at the file beginning; skip UTF8-encoded BOM
406 * if present. Sane editors won't put this in on their
407 * own, but e.g. Windows Notepad will do it happily. */
408 if ((unsigned char) c == *bomptr) {
409 bomptr++;
410 continue;
411 } else {
412 /* Do not tolerate partial BOM. */
413 if (bomptr != utf8_bom)
414 break;
415 /* No BOM at file beginning. Cool. */
416 bomptr = NULL;
417 }
418 }
419 if (c == '\n') {
420 if (cf->eof)
421 return 0;
422 comment = 0;
423 continue;
424 }
425 if (comment || isspace(c))
426 continue;
427 if (c == '#' || c == ';') {
428 comment = 1;
429 continue;
430 }
431 if (c == '[') {
432 /* Reset prior to determining a new stem */
433 strbuf_reset(var);
434 if (get_base_var(var) < 0 || var->len < 1)
435 break;
436 strbuf_addch(var, '.');
437 baselen = var->len;
438 continue;
439 }
440 if (!isalpha(c))
441 break;
442 /*
443 * Truncate the var name back to the section header
444 * stem prior to grabbing the suffix part of the name
445 * and the value.
446 */
447 strbuf_setlen(var, baselen);
448 strbuf_addch(var, tolower(c));
449 if (get_value(fn, data, var) < 0)
450 break;
451 }
452 if (cf->die_on_error)
453 die("bad config file line %d in %s", cf->linenr, cf->name);
454 else
455 return error("bad config file line %d in %s", cf->linenr, cf->name);
456 }
457
458 static int parse_unit_factor(const char *end, uintmax_t *val)
459 {
460 if (!*end)
461 return 1;
462 else if (!strcasecmp(end, "k")) {
463 *val *= 1024;
464 return 1;
465 }
466 else if (!strcasecmp(end, "m")) {
467 *val *= 1024 * 1024;
468 return 1;
469 }
470 else if (!strcasecmp(end, "g")) {
471 *val *= 1024 * 1024 * 1024;
472 return 1;
473 }
474 return 0;
475 }
476
477 static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
478 {
479 if (value && *value) {
480 char *end;
481 intmax_t val;
482 uintmax_t uval;
483 uintmax_t factor = 1;
484
485 errno = 0;
486 val = strtoimax(value, &end, 0);
487 if (errno == ERANGE)
488 return 0;
489 if (!parse_unit_factor(end, &factor)) {
490 errno = EINVAL;
491 return 0;
492 }
493 uval = abs(val);
494 uval *= factor;
495 if (uval > max || abs(val) > uval) {
496 errno = ERANGE;
497 return 0;
498 }
499 val *= factor;
500 *ret = val;
501 return 1;
502 }
503 errno = EINVAL;
504 return 0;
505 }
506
507 static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
508 {
509 if (value && *value) {
510 char *end;
511 uintmax_t val;
512 uintmax_t oldval;
513
514 errno = 0;
515 val = strtoumax(value, &end, 0);
516 if (errno == ERANGE)
517 return 0;
518 oldval = val;
519 if (!parse_unit_factor(end, &val)) {
520 errno = EINVAL;
521 return 0;
522 }
523 if (val > max || oldval > val) {
524 errno = ERANGE;
525 return 0;
526 }
527 *ret = val;
528 return 1;
529 }
530 errno = EINVAL;
531 return 0;
532 }
533
534 static int git_parse_int(const char *value, int *ret)
535 {
536 intmax_t tmp;
537 if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
538 return 0;
539 *ret = tmp;
540 return 1;
541 }
542
543 static int git_parse_int64(const char *value, int64_t *ret)
544 {
545 intmax_t tmp;
546 if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
547 return 0;
548 *ret = tmp;
549 return 1;
550 }
551
552 int git_parse_ulong(const char *value, unsigned long *ret)
553 {
554 uintmax_t tmp;
555 if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
556 return 0;
557 *ret = tmp;
558 return 1;
559 }
560
561 NORETURN
562 static void die_bad_number(const char *name, const char *value)
563 {
564 const char *reason = errno == ERANGE ?
565 "out of range" :
566 "invalid unit";
567 if (!value)
568 value = "";
569
570 if (cf && cf->name)
571 die("bad numeric config value '%s' for '%s' in %s: %s",
572 value, name, cf->name, reason);
573 die("bad numeric config value '%s' for '%s': %s", value, name, reason);
574 }
575
576 int git_config_int(const char *name, const char *value)
577 {
578 int ret;
579 if (!git_parse_int(value, &ret))
580 die_bad_number(name, value);
581 return ret;
582 }
583
584 int64_t git_config_int64(const char *name, const char *value)
585 {
586 int64_t ret;
587 if (!git_parse_int64(value, &ret))
588 die_bad_number(name, value);
589 return ret;
590 }
591
592 unsigned long git_config_ulong(const char *name, const char *value)
593 {
594 unsigned long ret;
595 if (!git_parse_ulong(value, &ret))
596 die_bad_number(name, value);
597 return ret;
598 }
599
600 static int git_config_maybe_bool_text(const char *name, const char *value)
601 {
602 if (!value)
603 return 1;
604 if (!*value)
605 return 0;
606 if (!strcasecmp(value, "true")
607 || !strcasecmp(value, "yes")
608 || !strcasecmp(value, "on"))
609 return 1;
610 if (!strcasecmp(value, "false")
611 || !strcasecmp(value, "no")
612 || !strcasecmp(value, "off"))
613 return 0;
614 return -1;
615 }
616
617 int git_config_maybe_bool(const char *name, const char *value)
618 {
619 int v = git_config_maybe_bool_text(name, value);
620 if (0 <= v)
621 return v;
622 if (git_parse_int(value, &v))
623 return !!v;
624 return -1;
625 }
626
627 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
628 {
629 int v = git_config_maybe_bool_text(name, value);
630 if (0 <= v) {
631 *is_bool = 1;
632 return v;
633 }
634 *is_bool = 0;
635 return git_config_int(name, value);
636 }
637
638 int git_config_bool(const char *name, const char *value)
639 {
640 int discard;
641 return !!git_config_bool_or_int(name, value, &discard);
642 }
643
644 int git_config_string(const char **dest, const char *var, const char *value)
645 {
646 if (!value)
647 return config_error_nonbool(var);
648 *dest = xstrdup(value);
649 return 0;
650 }
651
652 int git_config_pathname(const char **dest, const char *var, const char *value)
653 {
654 if (!value)
655 return config_error_nonbool(var);
656 *dest = expand_user_path(value);
657 if (!*dest)
658 die("Failed to expand user dir in: '%s'", value);
659 return 0;
660 }
661
662 static int git_default_core_config(const char *var, const char *value)
663 {
664 /* This needs a better name */
665 if (!strcmp(var, "core.filemode")) {
666 trust_executable_bit = git_config_bool(var, value);
667 return 0;
668 }
669 if (!strcmp(var, "core.trustctime")) {
670 trust_ctime = git_config_bool(var, value);
671 return 0;
672 }
673 if (!strcmp(var, "core.checkstat")) {
674 if (!strcasecmp(value, "default"))
675 check_stat = 1;
676 else if (!strcasecmp(value, "minimal"))
677 check_stat = 0;
678 }
679
680 if (!strcmp(var, "core.quotepath")) {
681 quote_path_fully = git_config_bool(var, value);
682 return 0;
683 }
684
685 if (!strcmp(var, "core.symlinks")) {
686 has_symlinks = git_config_bool(var, value);
687 return 0;
688 }
689
690 if (!strcmp(var, "core.ignorecase")) {
691 ignore_case = git_config_bool(var, value);
692 return 0;
693 }
694
695 if (!strcmp(var, "core.attributesfile"))
696 return git_config_pathname(&git_attributes_file, var, value);
697
698 if (!strcmp(var, "core.bare")) {
699 is_bare_repository_cfg = git_config_bool(var, value);
700 return 0;
701 }
702
703 if (!strcmp(var, "core.ignorestat")) {
704 assume_unchanged = git_config_bool(var, value);
705 return 0;
706 }
707
708 if (!strcmp(var, "core.prefersymlinkrefs")) {
709 prefer_symlink_refs = git_config_bool(var, value);
710 return 0;
711 }
712
713 if (!strcmp(var, "core.logallrefupdates")) {
714 log_all_ref_updates = git_config_bool(var, value);
715 return 0;
716 }
717
718 if (!strcmp(var, "core.warnambiguousrefs")) {
719 warn_ambiguous_refs = git_config_bool(var, value);
720 return 0;
721 }
722
723 if (!strcmp(var, "core.abbrev")) {
724 int abbrev = git_config_int(var, value);
725 if (abbrev < minimum_abbrev || abbrev > 40)
726 return -1;
727 default_abbrev = abbrev;
728 return 0;
729 }
730
731 if (!strcmp(var, "core.loosecompression")) {
732 int level = git_config_int(var, value);
733 if (level == -1)
734 level = Z_DEFAULT_COMPRESSION;
735 else if (level < 0 || level > Z_BEST_COMPRESSION)
736 die("bad zlib compression level %d", level);
737 zlib_compression_level = level;
738 zlib_compression_seen = 1;
739 return 0;
740 }
741
742 if (!strcmp(var, "core.compression")) {
743 int level = git_config_int(var, value);
744 if (level == -1)
745 level = Z_DEFAULT_COMPRESSION;
746 else if (level < 0 || level > Z_BEST_COMPRESSION)
747 die("bad zlib compression level %d", level);
748 core_compression_level = level;
749 core_compression_seen = 1;
750 if (!zlib_compression_seen)
751 zlib_compression_level = level;
752 return 0;
753 }
754
755 if (!strcmp(var, "core.packedgitwindowsize")) {
756 int pgsz_x2 = getpagesize() * 2;
757 packed_git_window_size = git_config_ulong(var, value);
758
759 /* This value must be multiple of (pagesize * 2) */
760 packed_git_window_size /= pgsz_x2;
761 if (packed_git_window_size < 1)
762 packed_git_window_size = 1;
763 packed_git_window_size *= pgsz_x2;
764 return 0;
765 }
766
767 if (!strcmp(var, "core.bigfilethreshold")) {
768 big_file_threshold = git_config_ulong(var, value);
769 return 0;
770 }
771
772 if (!strcmp(var, "core.packedgitlimit")) {
773 packed_git_limit = git_config_ulong(var, value);
774 return 0;
775 }
776
777 if (!strcmp(var, "core.deltabasecachelimit")) {
778 delta_base_cache_limit = git_config_ulong(var, value);
779 return 0;
780 }
781
782 if (!strcmp(var, "core.autocrlf")) {
783 if (value && !strcasecmp(value, "input")) {
784 if (core_eol == EOL_CRLF)
785 return error("core.autocrlf=input conflicts with core.eol=crlf");
786 auto_crlf = AUTO_CRLF_INPUT;
787 return 0;
788 }
789 auto_crlf = git_config_bool(var, value);
790 return 0;
791 }
792
793 if (!strcmp(var, "core.safecrlf")) {
794 if (value && !strcasecmp(value, "warn")) {
795 safe_crlf = SAFE_CRLF_WARN;
796 return 0;
797 }
798 safe_crlf = git_config_bool(var, value);
799 return 0;
800 }
801
802 if (!strcmp(var, "core.eol")) {
803 if (value && !strcasecmp(value, "lf"))
804 core_eol = EOL_LF;
805 else if (value && !strcasecmp(value, "crlf"))
806 core_eol = EOL_CRLF;
807 else if (value && !strcasecmp(value, "native"))
808 core_eol = EOL_NATIVE;
809 else
810 core_eol = EOL_UNSET;
811 if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
812 return error("core.autocrlf=input conflicts with core.eol=crlf");
813 return 0;
814 }
815
816 if (!strcmp(var, "core.notesref")) {
817 notes_ref_name = xstrdup(value);
818 return 0;
819 }
820
821 if (!strcmp(var, "core.pager"))
822 return git_config_string(&pager_program, var, value);
823
824 if (!strcmp(var, "core.editor"))
825 return git_config_string(&editor_program, var, value);
826
827 if (!strcmp(var, "core.commentchar")) {
828 if (!value)
829 return config_error_nonbool(var);
830 else if (!strcasecmp(value, "auto"))
831 auto_comment_line_char = 1;
832 else if (value[0] && !value[1]) {
833 comment_line_char = value[0];
834 auto_comment_line_char = 0;
835 } else
836 return error("core.commentChar should only be one character");
837 return 0;
838 }
839
840 if (!strcmp(var, "core.askpass"))
841 return git_config_string(&askpass_program, var, value);
842
843 if (!strcmp(var, "core.excludesfile"))
844 return git_config_pathname(&excludes_file, var, value);
845
846 if (!strcmp(var, "core.whitespace")) {
847 if (!value)
848 return config_error_nonbool(var);
849 whitespace_rule_cfg = parse_whitespace_rule(value);
850 return 0;
851 }
852
853 if (!strcmp(var, "core.fsyncobjectfiles")) {
854 fsync_object_files = git_config_bool(var, value);
855 return 0;
856 }
857
858 if (!strcmp(var, "core.preloadindex")) {
859 core_preload_index = git_config_bool(var, value);
860 return 0;
861 }
862
863 if (!strcmp(var, "core.createobject")) {
864 if (!strcmp(value, "rename"))
865 object_creation_mode = OBJECT_CREATION_USES_RENAMES;
866 else if (!strcmp(value, "link"))
867 object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
868 else
869 die("Invalid mode for object creation: %s", value);
870 return 0;
871 }
872
873 if (!strcmp(var, "core.sparsecheckout")) {
874 core_apply_sparse_checkout = git_config_bool(var, value);
875 return 0;
876 }
877
878 if (!strcmp(var, "core.precomposeunicode")) {
879 precomposed_unicode = git_config_bool(var, value);
880 return 0;
881 }
882
883 if (!strcmp(var, "core.protecthfs")) {
884 protect_hfs = git_config_bool(var, value);
885 return 0;
886 }
887
888 if (!strcmp(var, "core.protectntfs")) {
889 protect_ntfs = git_config_bool(var, value);
890 return 0;
891 }
892
893 /* Add other config variables here and to Documentation/config.txt. */
894 return 0;
895 }
896
897 static int git_default_i18n_config(const char *var, const char *value)
898 {
899 if (!strcmp(var, "i18n.commitencoding"))
900 return git_config_string(&git_commit_encoding, var, value);
901
902 if (!strcmp(var, "i18n.logoutputencoding"))
903 return git_config_string(&git_log_output_encoding, var, value);
904
905 /* Add other config variables here and to Documentation/config.txt. */
906 return 0;
907 }
908
909 static int git_default_branch_config(const char *var, const char *value)
910 {
911 if (!strcmp(var, "branch.autosetupmerge")) {
912 if (value && !strcasecmp(value, "always")) {
913 git_branch_track = BRANCH_TRACK_ALWAYS;
914 return 0;
915 }
916 git_branch_track = git_config_bool(var, value);
917 return 0;
918 }
919 if (!strcmp(var, "branch.autosetuprebase")) {
920 if (!value)
921 return config_error_nonbool(var);
922 else if (!strcmp(value, "never"))
923 autorebase = AUTOREBASE_NEVER;
924 else if (!strcmp(value, "local"))
925 autorebase = AUTOREBASE_LOCAL;
926 else if (!strcmp(value, "remote"))
927 autorebase = AUTOREBASE_REMOTE;
928 else if (!strcmp(value, "always"))
929 autorebase = AUTOREBASE_ALWAYS;
930 else
931 return error("Malformed value for %s", var);
932 return 0;
933 }
934
935 /* Add other config variables here and to Documentation/config.txt. */
936 return 0;
937 }
938
939 static int git_default_push_config(const char *var, const char *value)
940 {
941 if (!strcmp(var, "push.default")) {
942 if (!value)
943 return config_error_nonbool(var);
944 else if (!strcmp(value, "nothing"))
945 push_default = PUSH_DEFAULT_NOTHING;
946 else if (!strcmp(value, "matching"))
947 push_default = PUSH_DEFAULT_MATCHING;
948 else if (!strcmp(value, "simple"))
949 push_default = PUSH_DEFAULT_SIMPLE;
950 else if (!strcmp(value, "upstream"))
951 push_default = PUSH_DEFAULT_UPSTREAM;
952 else if (!strcmp(value, "tracking")) /* deprecated */
953 push_default = PUSH_DEFAULT_UPSTREAM;
954 else if (!strcmp(value, "current"))
955 push_default = PUSH_DEFAULT_CURRENT;
956 else {
957 error("Malformed value for %s: %s", var, value);
958 return error("Must be one of nothing, matching, simple, "
959 "upstream or current.");
960 }
961 return 0;
962 }
963
964 /* Add other config variables here and to Documentation/config.txt. */
965 return 0;
966 }
967
968 static int git_default_mailmap_config(const char *var, const char *value)
969 {
970 if (!strcmp(var, "mailmap.file"))
971 return git_config_pathname(&git_mailmap_file, var, value);
972 if (!strcmp(var, "mailmap.blob"))
973 return git_config_string(&git_mailmap_blob, var, value);
974
975 /* Add other config variables here and to Documentation/config.txt. */
976 return 0;
977 }
978
979 int git_default_config(const char *var, const char *value, void *dummy)
980 {
981 if (starts_with(var, "core."))
982 return git_default_core_config(var, value);
983
984 if (starts_with(var, "user."))
985 return git_ident_config(var, value, dummy);
986
987 if (starts_with(var, "i18n."))
988 return git_default_i18n_config(var, value);
989
990 if (starts_with(var, "branch."))
991 return git_default_branch_config(var, value);
992
993 if (starts_with(var, "push."))
994 return git_default_push_config(var, value);
995
996 if (starts_with(var, "mailmap."))
997 return git_default_mailmap_config(var, value);
998
999 if (starts_with(var, "advice."))
1000 return git_default_advice_config(var, value);
1001
1002 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1003 pager_use_color = git_config_bool(var,value);
1004 return 0;
1005 }
1006
1007 if (!strcmp(var, "pack.packsizelimit")) {
1008 pack_size_limit_cfg = git_config_ulong(var, value);
1009 return 0;
1010 }
1011 /* Add other config variables here and to Documentation/config.txt. */
1012 return 0;
1013 }
1014
1015 /*
1016 * All source specific fields in the union, die_on_error, name and the callbacks
1017 * fgetc, ungetc, ftell of top need to be initialized before calling
1018 * this function.
1019 */
1020 static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1021 {
1022 int ret;
1023
1024 /* push config-file parsing state stack */
1025 top->prev = cf;
1026 top->linenr = 1;
1027 top->eof = 0;
1028 strbuf_init(&top->value, 1024);
1029 strbuf_init(&top->var, 1024);
1030 cf = top;
1031
1032 ret = git_parse_source(fn, data);
1033
1034 /* pop config-file parsing state stack */
1035 strbuf_release(&top->value);
1036 strbuf_release(&top->var);
1037 cf = top->prev;
1038
1039 return ret;
1040 }
1041
1042 static int do_config_from_file(config_fn_t fn,
1043 const char *name, const char *path, FILE *f, void *data)
1044 {
1045 struct config_source top;
1046
1047 top.u.file = f;
1048 top.name = name;
1049 top.path = path;
1050 top.die_on_error = 1;
1051 top.do_fgetc = config_file_fgetc;
1052 top.do_ungetc = config_file_ungetc;
1053 top.do_ftell = config_file_ftell;
1054
1055 return do_config_from(&top, fn, data);
1056 }
1057
1058 static int git_config_from_stdin(config_fn_t fn, void *data)
1059 {
1060 return do_config_from_file(fn, "<stdin>", NULL, stdin, data);
1061 }
1062
1063 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1064 {
1065 int ret = -1;
1066 FILE *f;
1067
1068 f = fopen(filename, "r");
1069 if (f) {
1070 ret = do_config_from_file(fn, filename, filename, f, data);
1071 fclose(f);
1072 }
1073 return ret;
1074 }
1075
1076 int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1077 size_t len, void *data)
1078 {
1079 struct config_source top;
1080
1081 top.u.buf.buf = buf;
1082 top.u.buf.len = len;
1083 top.u.buf.pos = 0;
1084 top.name = name;
1085 top.path = NULL;
1086 top.die_on_error = 0;
1087 top.do_fgetc = config_buf_fgetc;
1088 top.do_ungetc = config_buf_ungetc;
1089 top.do_ftell = config_buf_ftell;
1090
1091 return do_config_from(&top, fn, data);
1092 }
1093
1094 static int git_config_from_blob_sha1(config_fn_t fn,
1095 const char *name,
1096 const unsigned char *sha1,
1097 void *data)
1098 {
1099 enum object_type type;
1100 char *buf;
1101 unsigned long size;
1102 int ret;
1103
1104 buf = read_sha1_file(sha1, &type, &size);
1105 if (!buf)
1106 return error("unable to load config blob object '%s'", name);
1107 if (type != OBJ_BLOB) {
1108 free(buf);
1109 return error("reference '%s' does not point to a blob", name);
1110 }
1111
1112 ret = git_config_from_buf(fn, name, buf, size, data);
1113 free(buf);
1114
1115 return ret;
1116 }
1117
1118 static int git_config_from_blob_ref(config_fn_t fn,
1119 const char *name,
1120 void *data)
1121 {
1122 unsigned char sha1[20];
1123
1124 if (get_sha1(name, sha1) < 0)
1125 return error("unable to resolve config blob '%s'", name);
1126 return git_config_from_blob_sha1(fn, name, sha1, data);
1127 }
1128
1129 const char *git_etc_gitconfig(void)
1130 {
1131 static const char *system_wide;
1132 if (!system_wide)
1133 system_wide = system_path(ETC_GITCONFIG);
1134 return system_wide;
1135 }
1136
1137 int git_env_bool(const char *k, int def)
1138 {
1139 const char *v = getenv(k);
1140 return v ? git_config_bool(k, v) : def;
1141 }
1142
1143 int git_config_system(void)
1144 {
1145 return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1146 }
1147
1148 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1149 {
1150 int ret = 0, found = 0;
1151 char *xdg_config = NULL;
1152 char *user_config = NULL;
1153
1154 home_config_paths(&user_config, &xdg_config, "config");
1155
1156 if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1157 ret += git_config_from_file(fn, git_etc_gitconfig(),
1158 data);
1159 found += 1;
1160 }
1161
1162 if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1163 ret += git_config_from_file(fn, xdg_config, data);
1164 found += 1;
1165 }
1166
1167 if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1168 ret += git_config_from_file(fn, user_config, data);
1169 found += 1;
1170 }
1171
1172 if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1173 ret += git_config_from_file(fn, repo_config, data);
1174 found += 1;
1175 }
1176
1177 switch (git_config_from_parameters(fn, data)) {
1178 case -1: /* error */
1179 die("unable to parse command-line config");
1180 break;
1181 case 0: /* found nothing */
1182 break;
1183 default: /* found at least one item */
1184 found++;
1185 break;
1186 }
1187
1188 free(xdg_config);
1189 free(user_config);
1190 return ret == 0 ? found : ret;
1191 }
1192
1193 int git_config_with_options(config_fn_t fn, void *data,
1194 struct git_config_source *config_source,
1195 int respect_includes)
1196 {
1197 char *repo_config = NULL;
1198 int ret;
1199 struct config_include_data inc = CONFIG_INCLUDE_INIT;
1200
1201 if (respect_includes) {
1202 inc.fn = fn;
1203 inc.data = data;
1204 fn = git_config_include;
1205 data = &inc;
1206 }
1207
1208 /*
1209 * If we have a specific filename, use it. Otherwise, follow the
1210 * regular lookup sequence.
1211 */
1212 if (config_source && config_source->use_stdin)
1213 return git_config_from_stdin(fn, data);
1214 else if (config_source && config_source->file)
1215 return git_config_from_file(fn, config_source->file, data);
1216 else if (config_source && config_source->blob)
1217 return git_config_from_blob_ref(fn, config_source->blob, data);
1218
1219 repo_config = git_pathdup("config");
1220 ret = git_config_early(fn, data, repo_config);
1221 if (repo_config)
1222 free(repo_config);
1223 return ret;
1224 }
1225
1226 int git_config(config_fn_t fn, void *data)
1227 {
1228 return git_config_with_options(fn, data, NULL, 1);
1229 }
1230
1231 /*
1232 * Find all the stuff for git_config_set() below.
1233 */
1234
1235 static struct {
1236 int baselen;
1237 char *key;
1238 int do_not_match;
1239 regex_t *value_regex;
1240 int multi_replace;
1241 size_t *offset;
1242 unsigned int offset_alloc;
1243 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1244 int seen;
1245 } store;
1246
1247 static int matches(const char *key, const char *value)
1248 {
1249 if (strcmp(key, store.key))
1250 return 0; /* not ours */
1251 if (!store.value_regex)
1252 return 1; /* always matches */
1253 if (store.value_regex == CONFIG_REGEX_NONE)
1254 return 0; /* never matches */
1255
1256 return store.do_not_match ^
1257 (value && !regexec(store.value_regex, value, 0, NULL, 0));
1258 }
1259
1260 static int store_aux(const char *key, const char *value, void *cb)
1261 {
1262 const char *ep;
1263 size_t section_len;
1264
1265 switch (store.state) {
1266 case KEY_SEEN:
1267 if (matches(key, value)) {
1268 if (store.seen == 1 && store.multi_replace == 0) {
1269 warning("%s has multiple values", key);
1270 }
1271
1272 ALLOC_GROW(store.offset, store.seen + 1,
1273 store.offset_alloc);
1274
1275 store.offset[store.seen] = cf->do_ftell(cf);
1276 store.seen++;
1277 }
1278 break;
1279 case SECTION_SEEN:
1280 /*
1281 * What we are looking for is in store.key (both
1282 * section and var), and its section part is baselen
1283 * long. We found key (again, both section and var).
1284 * We would want to know if this key is in the same
1285 * section as what we are looking for. We already
1286 * know we are in the same section as what should
1287 * hold store.key.
1288 */
1289 ep = strrchr(key, '.');
1290 section_len = ep - key;
1291
1292 if ((section_len != store.baselen) ||
1293 memcmp(key, store.key, section_len+1)) {
1294 store.state = SECTION_END_SEEN;
1295 break;
1296 }
1297
1298 /*
1299 * Do not increment matches: this is no match, but we
1300 * just made sure we are in the desired section.
1301 */
1302 ALLOC_GROW(store.offset, store.seen + 1,
1303 store.offset_alloc);
1304 store.offset[store.seen] = cf->do_ftell(cf);
1305 /* fallthru */
1306 case SECTION_END_SEEN:
1307 case START:
1308 if (matches(key, value)) {
1309 ALLOC_GROW(store.offset, store.seen + 1,
1310 store.offset_alloc);
1311 store.offset[store.seen] = cf->do_ftell(cf);
1312 store.state = KEY_SEEN;
1313 store.seen++;
1314 } else {
1315 if (strrchr(key, '.') - key == store.baselen &&
1316 !strncmp(key, store.key, store.baselen)) {
1317 store.state = SECTION_SEEN;
1318 ALLOC_GROW(store.offset,
1319 store.seen + 1,
1320 store.offset_alloc);
1321 store.offset[store.seen] = cf->do_ftell(cf);
1322 }
1323 }
1324 }
1325 return 0;
1326 }
1327
1328 static int write_error(const char *filename)
1329 {
1330 error("failed to write new configuration file %s", filename);
1331
1332 /* Same error code as "failed to rename". */
1333 return 4;
1334 }
1335
1336 static int store_write_section(int fd, const char *key)
1337 {
1338 const char *dot;
1339 int i, success;
1340 struct strbuf sb = STRBUF_INIT;
1341
1342 dot = memchr(key, '.', store.baselen);
1343 if (dot) {
1344 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1345 for (i = dot - key + 1; i < store.baselen; i++) {
1346 if (key[i] == '"' || key[i] == '\\')
1347 strbuf_addch(&sb, '\\');
1348 strbuf_addch(&sb, key[i]);
1349 }
1350 strbuf_addstr(&sb, "\"]\n");
1351 } else {
1352 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1353 }
1354
1355 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1356 strbuf_release(&sb);
1357
1358 return success;
1359 }
1360
1361 static int store_write_pair(int fd, const char *key, const char *value)
1362 {
1363 int i, success;
1364 int length = strlen(key + store.baselen + 1);
1365 const char *quote = "";
1366 struct strbuf sb = STRBUF_INIT;
1367
1368 /*
1369 * Check to see if the value needs to be surrounded with a dq pair.
1370 * Note that problematic characters are always backslash-quoted; this
1371 * check is about not losing leading or trailing SP and strings that
1372 * follow beginning-of-comment characters (i.e. ';' and '#') by the
1373 * configuration parser.
1374 */
1375 if (value[0] == ' ')
1376 quote = "\"";
1377 for (i = 0; value[i]; i++)
1378 if (value[i] == ';' || value[i] == '#')
1379 quote = "\"";
1380 if (i && value[i - 1] == ' ')
1381 quote = "\"";
1382
1383 strbuf_addf(&sb, "\t%.*s = %s",
1384 length, key + store.baselen + 1, quote);
1385
1386 for (i = 0; value[i]; i++)
1387 switch (value[i]) {
1388 case '\n':
1389 strbuf_addstr(&sb, "\\n");
1390 break;
1391 case '\t':
1392 strbuf_addstr(&sb, "\\t");
1393 break;
1394 case '"':
1395 case '\\':
1396 strbuf_addch(&sb, '\\');
1397 default:
1398 strbuf_addch(&sb, value[i]);
1399 break;
1400 }
1401 strbuf_addf(&sb, "%s\n", quote);
1402
1403 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1404 strbuf_release(&sb);
1405
1406 return success;
1407 }
1408
1409 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1410 size_t offset_, int *found_bracket)
1411 {
1412 size_t equal_offset = size, bracket_offset = size;
1413 ssize_t offset;
1414
1415 contline:
1416 for (offset = offset_-2; offset > 0
1417 && contents[offset] != '\n'; offset--)
1418 switch (contents[offset]) {
1419 case '=': equal_offset = offset; break;
1420 case ']': bracket_offset = offset; break;
1421 }
1422 if (offset > 0 && contents[offset-1] == '\\') {
1423 offset_ = offset;
1424 goto contline;
1425 }
1426 if (bracket_offset < equal_offset) {
1427 *found_bracket = 1;
1428 offset = bracket_offset+1;
1429 } else
1430 offset++;
1431
1432 return offset;
1433 }
1434
1435 int git_config_set_in_file(const char *config_filename,
1436 const char *key, const char *value)
1437 {
1438 return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1439 }
1440
1441 int git_config_set(const char *key, const char *value)
1442 {
1443 return git_config_set_multivar(key, value, NULL, 0);
1444 }
1445
1446 /*
1447 * Auxiliary function to sanity-check and split the key into the section
1448 * identifier and variable name.
1449 *
1450 * Returns 0 on success, -1 when there is an invalid character in the key and
1451 * -2 if there is no section name in the key.
1452 *
1453 * store_key - pointer to char* which will hold a copy of the key with
1454 * lowercase section and variable name
1455 * baselen - pointer to int which will hold the length of the
1456 * section + subsection part, can be NULL
1457 */
1458 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1459 {
1460 int i, dot, baselen;
1461 const char *last_dot = strrchr(key, '.');
1462
1463 /*
1464 * Since "key" actually contains the section name and the real
1465 * key name separated by a dot, we have to know where the dot is.
1466 */
1467
1468 if (last_dot == NULL || last_dot == key) {
1469 error("key does not contain a section: %s", key);
1470 return -CONFIG_NO_SECTION_OR_NAME;
1471 }
1472
1473 if (!last_dot[1]) {
1474 error("key does not contain variable name: %s", key);
1475 return -CONFIG_NO_SECTION_OR_NAME;
1476 }
1477
1478 baselen = last_dot - key;
1479 if (baselen_)
1480 *baselen_ = baselen;
1481
1482 /*
1483 * Validate the key and while at it, lower case it for matching.
1484 */
1485 *store_key = xmalloc(strlen(key) + 1);
1486
1487 dot = 0;
1488 for (i = 0; key[i]; i++) {
1489 unsigned char c = key[i];
1490 if (c == '.')
1491 dot = 1;
1492 /* Leave the extended basename untouched.. */
1493 if (!dot || i > baselen) {
1494 if (!iskeychar(c) ||
1495 (i == baselen + 1 && !isalpha(c))) {
1496 error("invalid key: %s", key);
1497 goto out_free_ret_1;
1498 }
1499 c = tolower(c);
1500 } else if (c == '\n') {
1501 error("invalid key (newline): %s", key);
1502 goto out_free_ret_1;
1503 }
1504 (*store_key)[i] = c;
1505 }
1506 (*store_key)[i] = 0;
1507
1508 return 0;
1509
1510 out_free_ret_1:
1511 free(*store_key);
1512 *store_key = NULL;
1513 return -CONFIG_INVALID_KEY;
1514 }
1515
1516 /*
1517 * If value==NULL, unset in (remove from) config,
1518 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1519 * if value_regex==CONFIG_REGEX_NONE, do not match any existing values
1520 * (only add a new one)
1521 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1522 * else all matching key/values (regardless how many) are removed,
1523 * before the new pair is written.
1524 *
1525 * Returns 0 on success.
1526 *
1527 * This function does this:
1528 *
1529 * - it locks the config file by creating ".git/config.lock"
1530 *
1531 * - it then parses the config using store_aux() as validator to find
1532 * the position on the key/value pair to replace. If it is to be unset,
1533 * it must be found exactly once.
1534 *
1535 * - the config file is mmap()ed and the part before the match (if any) is
1536 * written to the lock file, then the changed part and the rest.
1537 *
1538 * - the config file is removed and the lock file rename()d to it.
1539 *
1540 */
1541 int git_config_set_multivar_in_file(const char *config_filename,
1542 const char *key, const char *value,
1543 const char *value_regex, int multi_replace)
1544 {
1545 int fd = -1, in_fd;
1546 int ret;
1547 struct lock_file *lock = NULL;
1548 char *filename_buf = NULL;
1549
1550 /* parse-key returns negative; flip the sign to feed exit(3) */
1551 ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1552 if (ret)
1553 goto out_free;
1554
1555 store.multi_replace = multi_replace;
1556
1557 if (!config_filename)
1558 config_filename = filename_buf = git_pathdup("config");
1559
1560 /*
1561 * The lock serves a purpose in addition to locking: the new
1562 * contents of .git/config will be written into it.
1563 */
1564 lock = xcalloc(1, sizeof(struct lock_file));
1565 fd = hold_lock_file_for_update(lock, config_filename, 0);
1566 if (fd < 0) {
1567 error("could not lock config file %s: %s", config_filename, strerror(errno));
1568 free(store.key);
1569 ret = CONFIG_NO_LOCK;
1570 goto out_free;
1571 }
1572
1573 /*
1574 * If .git/config does not exist yet, write a minimal version.
1575 */
1576 in_fd = open(config_filename, O_RDONLY);
1577 if ( in_fd < 0 ) {
1578 free(store.key);
1579
1580 if ( ENOENT != errno ) {
1581 error("opening %s: %s", config_filename,
1582 strerror(errno));
1583 ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1584 goto out_free;
1585 }
1586 /* if nothing to unset, error out */
1587 if (value == NULL) {
1588 ret = CONFIG_NOTHING_SET;
1589 goto out_free;
1590 }
1591
1592 store.key = (char *)key;
1593 if (!store_write_section(fd, key) ||
1594 !store_write_pair(fd, key, value))
1595 goto write_err_out;
1596 } else {
1597 struct stat st;
1598 char *contents;
1599 size_t contents_sz, copy_begin, copy_end;
1600 int i, new_line = 0;
1601
1602 if (value_regex == NULL)
1603 store.value_regex = NULL;
1604 else if (value_regex == CONFIG_REGEX_NONE)
1605 store.value_regex = CONFIG_REGEX_NONE;
1606 else {
1607 if (value_regex[0] == '!') {
1608 store.do_not_match = 1;
1609 value_regex++;
1610 } else
1611 store.do_not_match = 0;
1612
1613 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1614 if (regcomp(store.value_regex, value_regex,
1615 REG_EXTENDED)) {
1616 error("invalid pattern: %s", value_regex);
1617 free(store.value_regex);
1618 ret = CONFIG_INVALID_PATTERN;
1619 goto out_free;
1620 }
1621 }
1622
1623 ALLOC_GROW(store.offset, 1, store.offset_alloc);
1624 store.offset[0] = 0;
1625 store.state = START;
1626 store.seen = 0;
1627
1628 /*
1629 * After this, store.offset will contain the *end* offset
1630 * of the last match, or remain at 0 if no match was found.
1631 * As a side effect, we make sure to transform only a valid
1632 * existing config file.
1633 */
1634 if (git_config_from_file(store_aux, config_filename, NULL)) {
1635 error("invalid config file %s", config_filename);
1636 free(store.key);
1637 if (store.value_regex != NULL &&
1638 store.value_regex != CONFIG_REGEX_NONE) {
1639 regfree(store.value_regex);
1640 free(store.value_regex);
1641 }
1642 ret = CONFIG_INVALID_FILE;
1643 goto out_free;
1644 }
1645
1646 free(store.key);
1647 if (store.value_regex != NULL &&
1648 store.value_regex != CONFIG_REGEX_NONE) {
1649 regfree(store.value_regex);
1650 free(store.value_regex);
1651 }
1652
1653 /* if nothing to unset, or too many matches, error out */
1654 if ((store.seen == 0 && value == NULL) ||
1655 (store.seen > 1 && multi_replace == 0)) {
1656 ret = CONFIG_NOTHING_SET;
1657 goto out_free;
1658 }
1659
1660 fstat(in_fd, &st);
1661 contents_sz = xsize_t(st.st_size);
1662 contents = xmmap(NULL, contents_sz, PROT_READ,
1663 MAP_PRIVATE, in_fd, 0);
1664 close(in_fd);
1665
1666 if (chmod(lock->filename, st.st_mode & 07777) < 0) {
1667 error("chmod on %s failed: %s",
1668 lock->filename, strerror(errno));
1669 ret = CONFIG_NO_WRITE;
1670 goto out_free;
1671 }
1672
1673 if (store.seen == 0)
1674 store.seen = 1;
1675
1676 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1677 if (store.offset[i] == 0) {
1678 store.offset[i] = copy_end = contents_sz;
1679 } else if (store.state != KEY_SEEN) {
1680 copy_end = store.offset[i];
1681 } else
1682 copy_end = find_beginning_of_line(
1683 contents, contents_sz,
1684 store.offset[i]-2, &new_line);
1685
1686 if (copy_end > 0 && contents[copy_end-1] != '\n')
1687 new_line = 1;
1688
1689 /* write the first part of the config */
1690 if (copy_end > copy_begin) {
1691 if (write_in_full(fd, contents + copy_begin,
1692 copy_end - copy_begin) <
1693 copy_end - copy_begin)
1694 goto write_err_out;
1695 if (new_line &&
1696 write_str_in_full(fd, "\n") != 1)
1697 goto write_err_out;
1698 }
1699 copy_begin = store.offset[i];
1700 }
1701
1702 /* write the pair (value == NULL means unset) */
1703 if (value != NULL) {
1704 if (store.state == START) {
1705 if (!store_write_section(fd, key))
1706 goto write_err_out;
1707 }
1708 if (!store_write_pair(fd, key, value))
1709 goto write_err_out;
1710 }
1711
1712 /* write the rest of the config */
1713 if (copy_begin < contents_sz)
1714 if (write_in_full(fd, contents + copy_begin,
1715 contents_sz - copy_begin) <
1716 contents_sz - copy_begin)
1717 goto write_err_out;
1718
1719 munmap(contents, contents_sz);
1720 }
1721
1722 if (commit_lock_file(lock) < 0) {
1723 error("could not commit config file %s", config_filename);
1724 ret = CONFIG_NO_WRITE;
1725 goto out_free;
1726 }
1727
1728 /*
1729 * lock is committed, so don't try to roll it back below.
1730 * NOTE: Since lockfile.c keeps a linked list of all created
1731 * lock_file structures, it isn't safe to free(lock). It's
1732 * better to just leave it hanging around.
1733 */
1734 lock = NULL;
1735 ret = 0;
1736
1737 out_free:
1738 if (lock)
1739 rollback_lock_file(lock);
1740 free(filename_buf);
1741 return ret;
1742
1743 write_err_out:
1744 ret = write_error(lock->filename);
1745 goto out_free;
1746
1747 }
1748
1749 int git_config_set_multivar(const char *key, const char *value,
1750 const char *value_regex, int multi_replace)
1751 {
1752 return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1753 multi_replace);
1754 }
1755
1756 static int section_name_match (const char *buf, const char *name)
1757 {
1758 int i = 0, j = 0, dot = 0;
1759 if (buf[i] != '[')
1760 return 0;
1761 for (i = 1; buf[i] && buf[i] != ']'; i++) {
1762 if (!dot && isspace(buf[i])) {
1763 dot = 1;
1764 if (name[j++] != '.')
1765 break;
1766 for (i++; isspace(buf[i]); i++)
1767 ; /* do nothing */
1768 if (buf[i] != '"')
1769 break;
1770 continue;
1771 }
1772 if (buf[i] == '\\' && dot)
1773 i++;
1774 else if (buf[i] == '"' && dot) {
1775 for (i++; isspace(buf[i]); i++)
1776 ; /* do_nothing */
1777 break;
1778 }
1779 if (buf[i] != name[j++])
1780 break;
1781 }
1782 if (buf[i] == ']' && name[j] == 0) {
1783 /*
1784 * We match, now just find the right length offset by
1785 * gobbling up any whitespace after it, as well
1786 */
1787 i++;
1788 for (; buf[i] && isspace(buf[i]); i++)
1789 ; /* do nothing */
1790 return i;
1791 }
1792 return 0;
1793 }
1794
1795 static int section_name_is_ok(const char *name)
1796 {
1797 /* Empty section names are bogus. */
1798 if (!*name)
1799 return 0;
1800
1801 /*
1802 * Before a dot, we must be alphanumeric or dash. After the first dot,
1803 * anything goes, so we can stop checking.
1804 */
1805 for (; *name && *name != '.'; name++)
1806 if (*name != '-' && !isalnum(*name))
1807 return 0;
1808 return 1;
1809 }
1810
1811 /* if new_name == NULL, the section is removed instead */
1812 int git_config_rename_section_in_file(const char *config_filename,
1813 const char *old_name, const char *new_name)
1814 {
1815 int ret = 0, remove = 0;
1816 char *filename_buf = NULL;
1817 struct lock_file *lock;
1818 int out_fd;
1819 char buf[1024];
1820 FILE *config_file;
1821 struct stat st;
1822
1823 if (new_name && !section_name_is_ok(new_name)) {
1824 ret = error("invalid section name: %s", new_name);
1825 goto out;
1826 }
1827
1828 if (!config_filename)
1829 config_filename = filename_buf = git_pathdup("config");
1830
1831 lock = xcalloc(1, sizeof(struct lock_file));
1832 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1833 if (out_fd < 0) {
1834 ret = error("could not lock config file %s", config_filename);
1835 goto out;
1836 }
1837
1838 if (!(config_file = fopen(config_filename, "rb"))) {
1839 /* no config file means nothing to rename, no error */
1840 goto unlock_and_out;
1841 }
1842
1843 fstat(fileno(config_file), &st);
1844
1845 if (chmod(lock->filename, st.st_mode & 07777) < 0) {
1846 ret = error("chmod on %s failed: %s",
1847 lock->filename, strerror(errno));
1848 goto out;
1849 }
1850
1851 while (fgets(buf, sizeof(buf), config_file)) {
1852 int i;
1853 int length;
1854 char *output = buf;
1855 for (i = 0; buf[i] && isspace(buf[i]); i++)
1856 ; /* do nothing */
1857 if (buf[i] == '[') {
1858 /* it's a section */
1859 int offset = section_name_match(&buf[i], old_name);
1860 if (offset > 0) {
1861 ret++;
1862 if (new_name == NULL) {
1863 remove = 1;
1864 continue;
1865 }
1866 store.baselen = strlen(new_name);
1867 if (!store_write_section(out_fd, new_name)) {
1868 ret = write_error(lock->filename);
1869 goto out;
1870 }
1871 /*
1872 * We wrote out the new section, with
1873 * a newline, now skip the old
1874 * section's length
1875 */
1876 output += offset + i;
1877 if (strlen(output) > 0) {
1878 /*
1879 * More content means there's
1880 * a declaration to put on the
1881 * next line; indent with a
1882 * tab
1883 */
1884 output -= 1;
1885 output[0] = '\t';
1886 }
1887 }
1888 remove = 0;
1889 }
1890 if (remove)
1891 continue;
1892 length = strlen(output);
1893 if (write_in_full(out_fd, output, length) != length) {
1894 ret = write_error(lock->filename);
1895 goto out;
1896 }
1897 }
1898 fclose(config_file);
1899 unlock_and_out:
1900 if (commit_lock_file(lock) < 0)
1901 ret = error("could not commit config file %s", config_filename);
1902 out:
1903 free(filename_buf);
1904 return ret;
1905 }
1906
1907 int git_config_rename_section(const char *old_name, const char *new_name)
1908 {
1909 return git_config_rename_section_in_file(NULL, old_name, new_name);
1910 }
1911
1912 /*
1913 * Call this to report error for your variable that should not
1914 * get a boolean value (i.e. "[my] var" means "true").
1915 */
1916 #undef config_error_nonbool
1917 int config_error_nonbool(const char *var)
1918 {
1919 return error("Missing value for '%s'", var);
1920 }
1921
1922 int parse_config_key(const char *var,
1923 const char *section,
1924 const char **subsection, int *subsection_len,
1925 const char **key)
1926 {
1927 int section_len = strlen(section);
1928 const char *dot;
1929
1930 /* Does it start with "section." ? */
1931 if (!starts_with(var, section) || var[section_len] != '.')
1932 return -1;
1933
1934 /*
1935 * Find the key; we don't know yet if we have a subsection, but we must
1936 * parse backwards from the end, since the subsection may have dots in
1937 * it, too.
1938 */
1939 dot = strrchr(var, '.');
1940 *key = dot + 1;
1941
1942 /* Did we have a subsection at all? */
1943 if (dot == var + section_len) {
1944 *subsection = NULL;
1945 *subsection_len = 0;
1946 }
1947 else {
1948 *subsection = var + section_len + 1;
1949 *subsection_len = dot - *subsection;
1950 }
1951
1952 return 0;
1953 }
MinGW port of GIT