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