rerere.c: diagnose a corrupt MERGE_RR when hitting EOF between TAB and '\0'
[git.git] / config.c
blob749e5afc45ee17e840f0983f7c814a2c2efd6340
1 /*
2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
5 * Copyright (C) Johannes Schindelin, 2005
7 */
8 #include "cache.h"
9 #include "exec_cmd.h"
10 #include "strbuf.h"
11 #include "quote.h"
13 #define MAXNAME (256)
15 static FILE *config_file;
16 static const char *config_file_name;
17 static int config_linenr;
18 static int config_file_eof;
19 static int zlib_compression_seen;
21 const char *config_exclusive_filename = NULL;
23 struct config_item {
24 struct config_item *next;
25 char *name;
26 char *value;
28 static struct config_item *config_parameters;
29 static struct config_item **config_parameters_tail = &config_parameters;
31 static void lowercase(char *p)
33 for (; *p; p++)
34 *p = tolower(*p);
37 void git_config_push_parameter(const char *text)
39 struct strbuf env = STRBUF_INIT;
40 const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
41 if (old) {
42 strbuf_addstr(&env, old);
43 strbuf_addch(&env, ' ');
45 sq_quote_buf(&env, text);
46 setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
47 strbuf_release(&env);
50 int git_config_parse_parameter(const char *text)
52 struct config_item *ct;
53 struct strbuf tmp = STRBUF_INIT;
54 struct strbuf **pair;
55 strbuf_addstr(&tmp, text);
56 pair = strbuf_split(&tmp, '=');
57 if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
58 strbuf_setlen(pair[0], pair[0]->len - 1);
59 strbuf_trim(pair[0]);
60 if (!pair[0]->len) {
61 strbuf_list_free(pair);
62 return -1;
64 ct = xcalloc(1, sizeof(struct config_item));
65 ct->name = strbuf_detach(pair[0], NULL);
66 if (pair[1]) {
67 strbuf_trim(pair[1]);
68 ct->value = strbuf_detach(pair[1], NULL);
70 strbuf_list_free(pair);
71 lowercase(ct->name);
72 *config_parameters_tail = ct;
73 config_parameters_tail = &ct->next;
74 return 0;
77 int git_config_parse_environment(void) {
78 const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
79 char *envw;
80 const char **argv = NULL;
81 int nr = 0, alloc = 0;
82 int i;
84 if (!env)
85 return 0;
86 /* sq_dequote will write over it */
87 envw = xstrdup(env);
89 if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
90 free(envw);
91 return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
94 for (i = 0; i < nr; i++) {
95 if (git_config_parse_parameter(argv[i]) < 0) {
96 error("bogus config parameter: %s", argv[i]);
97 free(argv);
98 free(envw);
99 return -1;
103 free(argv);
104 free(envw);
105 return 0;
108 static int get_next_char(void)
110 int c;
111 FILE *f;
113 c = '\n';
114 if ((f = config_file) != NULL) {
115 c = fgetc(f);
116 if (c == '\r') {
117 /* DOS like systems */
118 c = fgetc(f);
119 if (c != '\n') {
120 ungetc(c, f);
121 c = '\r';
124 if (c == '\n')
125 config_linenr++;
126 if (c == EOF) {
127 config_file_eof = 1;
128 c = '\n';
131 return c;
134 static char *parse_value(void)
136 static char value[1024];
137 int quote = 0, comment = 0, len = 0, space = 0;
139 for (;;) {
140 int c = get_next_char();
141 if (len >= sizeof(value) - 1)
142 return NULL;
143 if (c == '\n') {
144 if (quote)
145 return NULL;
146 value[len] = 0;
147 return value;
149 if (comment)
150 continue;
151 if (isspace(c) && !quote) {
152 if (len)
153 space++;
154 continue;
156 if (!quote) {
157 if (c == ';' || c == '#') {
158 comment = 1;
159 continue;
162 for (; space; space--)
163 value[len++] = ' ';
164 if (c == '\\') {
165 c = get_next_char();
166 switch (c) {
167 case '\n':
168 continue;
169 case 't':
170 c = '\t';
171 break;
172 case 'b':
173 c = '\b';
174 break;
175 case 'n':
176 c = '\n';
177 break;
178 /* Some characters escape as themselves */
179 case '\\': case '"':
180 break;
181 /* Reject unknown escape sequences */
182 default:
183 return NULL;
185 value[len++] = c;
186 continue;
188 if (c == '"') {
189 quote = 1-quote;
190 continue;
192 value[len++] = c;
196 static inline int iskeychar(int c)
198 return isalnum(c) || c == '-';
201 static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
203 int c;
204 char *value;
206 /* Get the full name */
207 for (;;) {
208 c = get_next_char();
209 if (config_file_eof)
210 break;
211 if (!iskeychar(c))
212 break;
213 name[len++] = tolower(c);
214 if (len >= MAXNAME)
215 return -1;
217 name[len] = 0;
218 while (c == ' ' || c == '\t')
219 c = get_next_char();
221 value = NULL;
222 if (c != '\n') {
223 if (c != '=')
224 return -1;
225 value = parse_value();
226 if (!value)
227 return -1;
229 return fn(name, value, data);
232 static int get_extended_base_var(char *name, int baselen, int c)
234 do {
235 if (c == '\n')
236 return -1;
237 c = get_next_char();
238 } while (isspace(c));
240 /* We require the format to be '[base "extension"]' */
241 if (c != '"')
242 return -1;
243 name[baselen++] = '.';
245 for (;;) {
246 int c = get_next_char();
247 if (c == '\n')
248 return -1;
249 if (c == '"')
250 break;
251 if (c == '\\') {
252 c = get_next_char();
253 if (c == '\n')
254 return -1;
256 name[baselen++] = c;
257 if (baselen > MAXNAME / 2)
258 return -1;
261 /* Final ']' */
262 if (get_next_char() != ']')
263 return -1;
264 return baselen;
267 static int get_base_var(char *name)
269 int baselen = 0;
271 for (;;) {
272 int c = get_next_char();
273 if (config_file_eof)
274 return -1;
275 if (c == ']')
276 return baselen;
277 if (isspace(c))
278 return get_extended_base_var(name, baselen, c);
279 if (!iskeychar(c) && c != '.')
280 return -1;
281 if (baselen > MAXNAME / 2)
282 return -1;
283 name[baselen++] = tolower(c);
287 static int git_parse_file(config_fn_t fn, void *data)
289 int comment = 0;
290 int baselen = 0;
291 static char var[MAXNAME];
293 /* U+FEFF Byte Order Mark in UTF8 */
294 static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
295 const unsigned char *bomptr = utf8_bom;
297 for (;;) {
298 int c = get_next_char();
299 if (bomptr && *bomptr) {
300 /* We are at the file beginning; skip UTF8-encoded BOM
301 * if present. Sane editors won't put this in on their
302 * own, but e.g. Windows Notepad will do it happily. */
303 if ((unsigned char) c == *bomptr) {
304 bomptr++;
305 continue;
306 } else {
307 /* Do not tolerate partial BOM. */
308 if (bomptr != utf8_bom)
309 break;
310 /* No BOM at file beginning. Cool. */
311 bomptr = NULL;
314 if (c == '\n') {
315 if (config_file_eof)
316 return 0;
317 comment = 0;
318 continue;
320 if (comment || isspace(c))
321 continue;
322 if (c == '#' || c == ';') {
323 comment = 1;
324 continue;
326 if (c == '[') {
327 baselen = get_base_var(var);
328 if (baselen <= 0)
329 break;
330 var[baselen++] = '.';
331 var[baselen] = 0;
332 continue;
334 if (!isalpha(c))
335 break;
336 var[baselen] = tolower(c);
337 if (get_value(fn, data, var, baselen+1) < 0)
338 break;
340 die("bad config file line %d in %s", config_linenr, config_file_name);
343 static int parse_unit_factor(const char *end, unsigned long *val)
345 if (!*end)
346 return 1;
347 else if (!strcasecmp(end, "k")) {
348 *val *= 1024;
349 return 1;
351 else if (!strcasecmp(end, "m")) {
352 *val *= 1024 * 1024;
353 return 1;
355 else if (!strcasecmp(end, "g")) {
356 *val *= 1024 * 1024 * 1024;
357 return 1;
359 return 0;
362 static int git_parse_long(const char *value, long *ret)
364 if (value && *value) {
365 char *end;
366 long val = strtol(value, &end, 0);
367 unsigned long factor = 1;
368 if (!parse_unit_factor(end, &factor))
369 return 0;
370 *ret = val * factor;
371 return 1;
373 return 0;
376 int git_parse_ulong(const char *value, unsigned long *ret)
378 if (value && *value) {
379 char *end;
380 unsigned long val = strtoul(value, &end, 0);
381 if (!parse_unit_factor(end, &val))
382 return 0;
383 *ret = val;
384 return 1;
386 return 0;
389 static void die_bad_config(const char *name)
391 if (config_file_name)
392 die("bad config value for '%s' in %s", name, config_file_name);
393 die("bad config value for '%s'", name);
396 int git_config_int(const char *name, const char *value)
398 long ret = 0;
399 if (!git_parse_long(value, &ret))
400 die_bad_config(name);
401 return ret;
404 unsigned long git_config_ulong(const char *name, const char *value)
406 unsigned long ret;
407 if (!git_parse_ulong(value, &ret))
408 die_bad_config(name);
409 return ret;
412 static int git_config_maybe_bool_text(const char *name, const char *value)
414 if (!value)
415 return 1;
416 if (!*value)
417 return 0;
418 if (!strcasecmp(value, "true")
419 || !strcasecmp(value, "yes")
420 || !strcasecmp(value, "on"))
421 return 1;
422 if (!strcasecmp(value, "false")
423 || !strcasecmp(value, "no")
424 || !strcasecmp(value, "off"))
425 return 0;
426 return -1;
429 int git_config_maybe_bool(const char *name, const char *value)
431 long v = git_config_maybe_bool_text(name, value);
432 if (0 <= v)
433 return v;
434 if (git_parse_long(value, &v))
435 return !!v;
436 return -1;
439 int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
441 int v = git_config_maybe_bool_text(name, value);
442 if (0 <= v) {
443 *is_bool = 1;
444 return v;
446 *is_bool = 0;
447 return git_config_int(name, value);
450 int git_config_bool(const char *name, const char *value)
452 int discard;
453 return !!git_config_bool_or_int(name, value, &discard);
456 int git_config_string(const char **dest, const char *var, const char *value)
458 if (!value)
459 return config_error_nonbool(var);
460 *dest = xstrdup(value);
461 return 0;
464 int git_config_pathname(const char **dest, const char *var, const char *value)
466 if (!value)
467 return config_error_nonbool(var);
468 *dest = expand_user_path(value);
469 if (!*dest)
470 die("Failed to expand user dir in: '%s'", value);
471 return 0;
474 static int git_default_core_config(const char *var, const char *value)
476 /* This needs a better name */
477 if (!strcmp(var, "core.filemode")) {
478 trust_executable_bit = git_config_bool(var, value);
479 return 0;
481 if (!strcmp(var, "core.trustctime")) {
482 trust_ctime = git_config_bool(var, value);
483 return 0;
486 if (!strcmp(var, "core.quotepath")) {
487 quote_path_fully = git_config_bool(var, value);
488 return 0;
491 if (!strcmp(var, "core.symlinks")) {
492 has_symlinks = git_config_bool(var, value);
493 return 0;
496 if (!strcmp(var, "core.ignorecase")) {
497 ignore_case = git_config_bool(var, value);
498 return 0;
501 if (!strcmp(var, "core.bare")) {
502 is_bare_repository_cfg = git_config_bool(var, value);
503 return 0;
506 if (!strcmp(var, "core.ignorestat")) {
507 assume_unchanged = git_config_bool(var, value);
508 return 0;
511 if (!strcmp(var, "core.prefersymlinkrefs")) {
512 prefer_symlink_refs = git_config_bool(var, value);
513 return 0;
516 if (!strcmp(var, "core.logallrefupdates")) {
517 log_all_ref_updates = git_config_bool(var, value);
518 return 0;
521 if (!strcmp(var, "core.warnambiguousrefs")) {
522 warn_ambiguous_refs = git_config_bool(var, value);
523 return 0;
526 if (!strcmp(var, "core.abbrev")) {
527 int abbrev = git_config_int(var, value);
528 if (abbrev < minimum_abbrev || abbrev > 40)
529 return -1;
530 default_abbrev = abbrev;
531 return 0;
534 if (!strcmp(var, "core.loosecompression")) {
535 int level = git_config_int(var, value);
536 if (level == -1)
537 level = Z_DEFAULT_COMPRESSION;
538 else if (level < 0 || level > Z_BEST_COMPRESSION)
539 die("bad zlib compression level %d", level);
540 zlib_compression_level = level;
541 zlib_compression_seen = 1;
542 return 0;
545 if (!strcmp(var, "core.compression")) {
546 int level = git_config_int(var, value);
547 if (level == -1)
548 level = Z_DEFAULT_COMPRESSION;
549 else if (level < 0 || level > Z_BEST_COMPRESSION)
550 die("bad zlib compression level %d", level);
551 core_compression_level = level;
552 core_compression_seen = 1;
553 if (!zlib_compression_seen)
554 zlib_compression_level = level;
555 return 0;
558 if (!strcmp(var, "core.packedgitwindowsize")) {
559 int pgsz_x2 = getpagesize() * 2;
560 packed_git_window_size = git_config_int(var, value);
562 /* This value must be multiple of (pagesize * 2) */
563 packed_git_window_size /= pgsz_x2;
564 if (packed_git_window_size < 1)
565 packed_git_window_size = 1;
566 packed_git_window_size *= pgsz_x2;
567 return 0;
570 if (!strcmp(var, "core.packedgitlimit")) {
571 packed_git_limit = git_config_int(var, value);
572 return 0;
575 if (!strcmp(var, "core.deltabasecachelimit")) {
576 delta_base_cache_limit = git_config_int(var, value);
577 return 0;
580 if (!strcmp(var, "core.autocrlf")) {
581 if (value && !strcasecmp(value, "input")) {
582 if (eol == EOL_CRLF)
583 return error("core.autocrlf=input conflicts with core.eol=crlf");
584 auto_crlf = AUTO_CRLF_INPUT;
585 return 0;
587 auto_crlf = git_config_bool(var, value);
588 return 0;
591 if (!strcmp(var, "core.safecrlf")) {
592 if (value && !strcasecmp(value, "warn")) {
593 safe_crlf = SAFE_CRLF_WARN;
594 return 0;
596 safe_crlf = git_config_bool(var, value);
597 return 0;
600 if (!strcmp(var, "core.eol")) {
601 if (value && !strcasecmp(value, "lf"))
602 eol = EOL_LF;
603 else if (value && !strcasecmp(value, "crlf"))
604 eol = EOL_CRLF;
605 else if (value && !strcasecmp(value, "native"))
606 eol = EOL_NATIVE;
607 else
608 eol = EOL_UNSET;
609 if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
610 return error("core.autocrlf=input conflicts with core.eol=crlf");
611 return 0;
614 if (!strcmp(var, "core.notesref")) {
615 notes_ref_name = xstrdup(value);
616 return 0;
619 if (!strcmp(var, "core.pager"))
620 return git_config_string(&pager_program, var, value);
622 if (!strcmp(var, "core.editor"))
623 return git_config_string(&editor_program, var, value);
625 if (!strcmp(var, "core.askpass"))
626 return git_config_string(&askpass_program, var, value);
628 if (!strcmp(var, "core.excludesfile"))
629 return git_config_pathname(&excludes_file, var, value);
631 if (!strcmp(var, "core.whitespace")) {
632 if (!value)
633 return config_error_nonbool(var);
634 whitespace_rule_cfg = parse_whitespace_rule(value);
635 return 0;
638 if (!strcmp(var, "core.fsyncobjectfiles")) {
639 fsync_object_files = git_config_bool(var, value);
640 return 0;
643 if (!strcmp(var, "core.preloadindex")) {
644 core_preload_index = git_config_bool(var, value);
645 return 0;
648 if (!strcmp(var, "core.createobject")) {
649 if (!strcmp(value, "rename"))
650 object_creation_mode = OBJECT_CREATION_USES_RENAMES;
651 else if (!strcmp(value, "link"))
652 object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
653 else
654 die("Invalid mode for object creation: %s", value);
655 return 0;
658 if (!strcmp(var, "core.sparsecheckout")) {
659 core_apply_sparse_checkout = git_config_bool(var, value);
660 return 0;
663 /* Add other config variables here and to Documentation/config.txt. */
664 return 0;
667 static int git_default_user_config(const char *var, const char *value)
669 if (!strcmp(var, "user.name")) {
670 if (!value)
671 return config_error_nonbool(var);
672 strlcpy(git_default_name, value, sizeof(git_default_name));
673 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
674 return 0;
677 if (!strcmp(var, "user.email")) {
678 if (!value)
679 return config_error_nonbool(var);
680 strlcpy(git_default_email, value, sizeof(git_default_email));
681 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
682 return 0;
685 /* Add other config variables here and to Documentation/config.txt. */
686 return 0;
689 static int git_default_i18n_config(const char *var, const char *value)
691 if (!strcmp(var, "i18n.commitencoding"))
692 return git_config_string(&git_commit_encoding, var, value);
694 if (!strcmp(var, "i18n.logoutputencoding"))
695 return git_config_string(&git_log_output_encoding, var, value);
697 /* Add other config variables here and to Documentation/config.txt. */
698 return 0;
701 static int git_default_branch_config(const char *var, const char *value)
703 if (!strcmp(var, "branch.autosetupmerge")) {
704 if (value && !strcasecmp(value, "always")) {
705 git_branch_track = BRANCH_TRACK_ALWAYS;
706 return 0;
708 git_branch_track = git_config_bool(var, value);
709 return 0;
711 if (!strcmp(var, "branch.autosetuprebase")) {
712 if (!value)
713 return config_error_nonbool(var);
714 else if (!strcmp(value, "never"))
715 autorebase = AUTOREBASE_NEVER;
716 else if (!strcmp(value, "local"))
717 autorebase = AUTOREBASE_LOCAL;
718 else if (!strcmp(value, "remote"))
719 autorebase = AUTOREBASE_REMOTE;
720 else if (!strcmp(value, "always"))
721 autorebase = AUTOREBASE_ALWAYS;
722 else
723 return error("Malformed value for %s", var);
724 return 0;
727 /* Add other config variables here and to Documentation/config.txt. */
728 return 0;
731 static int git_default_push_config(const char *var, const char *value)
733 if (!strcmp(var, "push.default")) {
734 if (!value)
735 return config_error_nonbool(var);
736 else if (!strcmp(value, "nothing"))
737 push_default = PUSH_DEFAULT_NOTHING;
738 else if (!strcmp(value, "matching"))
739 push_default = PUSH_DEFAULT_MATCHING;
740 else if (!strcmp(value, "upstream"))
741 push_default = PUSH_DEFAULT_UPSTREAM;
742 else if (!strcmp(value, "tracking")) /* deprecated */
743 push_default = PUSH_DEFAULT_UPSTREAM;
744 else if (!strcmp(value, "current"))
745 push_default = PUSH_DEFAULT_CURRENT;
746 else {
747 error("Malformed value for %s: %s", var, value);
748 return error("Must be one of nothing, matching, "
749 "tracking or current.");
751 return 0;
754 /* Add other config variables here and to Documentation/config.txt. */
755 return 0;
758 static int git_default_mailmap_config(const char *var, const char *value)
760 if (!strcmp(var, "mailmap.file"))
761 return git_config_string(&git_mailmap_file, var, value);
763 /* Add other config variables here and to Documentation/config.txt. */
764 return 0;
767 int git_default_config(const char *var, const char *value, void *dummy)
769 if (!prefixcmp(var, "core."))
770 return git_default_core_config(var, value);
772 if (!prefixcmp(var, "user."))
773 return git_default_user_config(var, value);
775 if (!prefixcmp(var, "i18n."))
776 return git_default_i18n_config(var, value);
778 if (!prefixcmp(var, "branch."))
779 return git_default_branch_config(var, value);
781 if (!prefixcmp(var, "push."))
782 return git_default_push_config(var, value);
784 if (!prefixcmp(var, "mailmap."))
785 return git_default_mailmap_config(var, value);
787 if (!prefixcmp(var, "advice."))
788 return git_default_advice_config(var, value);
790 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
791 pager_use_color = git_config_bool(var,value);
792 return 0;
795 /* Add other config variables here and to Documentation/config.txt. */
796 return 0;
799 int git_config_from_file(config_fn_t fn, const char *filename, void *data)
801 int ret;
802 FILE *f = fopen(filename, "r");
804 ret = -1;
805 if (f) {
806 config_file = f;
807 config_file_name = filename;
808 config_linenr = 1;
809 config_file_eof = 0;
810 ret = git_parse_file(fn, data);
811 fclose(f);
812 config_file_name = NULL;
814 return ret;
817 const char *git_etc_gitconfig(void)
819 static const char *system_wide;
820 if (!system_wide)
821 system_wide = system_path(ETC_GITCONFIG);
822 return system_wide;
825 int git_env_bool(const char *k, int def)
827 const char *v = getenv(k);
828 return v ? git_config_bool(k, v) : def;
831 int git_config_system(void)
833 return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
836 int git_config_global(void)
838 return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
841 int git_config_from_parameters(config_fn_t fn, void *data)
843 static int loaded_environment;
844 const struct config_item *ct;
846 if (!loaded_environment) {
847 if (git_config_parse_environment() < 0)
848 return -1;
849 loaded_environment = 1;
851 for (ct = config_parameters; ct; ct = ct->next)
852 if (fn(ct->name, ct->value, data) < 0)
853 return -1;
854 return 0;
857 int git_config_early(config_fn_t fn, void *data, const char *repo_config)
859 int ret = 0, found = 0;
860 const char *home = NULL;
862 /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
863 if (config_exclusive_filename)
864 return git_config_from_file(fn, config_exclusive_filename, data);
865 if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
866 ret += git_config_from_file(fn, git_etc_gitconfig(),
867 data);
868 found += 1;
871 home = getenv("HOME");
872 if (git_config_global() && home) {
873 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
874 if (!access(user_config, R_OK)) {
875 ret += git_config_from_file(fn, user_config, data);
876 found += 1;
878 free(user_config);
881 if (repo_config && !access(repo_config, R_OK)) {
882 ret += git_config_from_file(fn, repo_config, data);
883 found += 1;
886 ret += git_config_from_parameters(fn, data);
887 if (config_parameters)
888 found += 1;
890 return ret == 0 ? found : ret;
893 int git_config(config_fn_t fn, void *data)
895 char *repo_config = NULL;
896 int ret;
898 repo_config = git_pathdup("config");
899 ret = git_config_early(fn, data, repo_config);
900 if (repo_config)
901 free(repo_config);
902 return ret;
906 * Find all the stuff for git_config_set() below.
909 #define MAX_MATCHES 512
911 static struct {
912 int baselen;
913 char *key;
914 int do_not_match;
915 regex_t *value_regex;
916 int multi_replace;
917 size_t offset[MAX_MATCHES];
918 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
919 int seen;
920 } store;
922 static int matches(const char *key, const char *value)
924 return !strcmp(key, store.key) &&
925 (store.value_regex == NULL ||
926 (store.do_not_match ^
927 !regexec(store.value_regex, value, 0, NULL, 0)));
930 static int store_aux(const char *key, const char *value, void *cb)
932 const char *ep;
933 size_t section_len;
935 switch (store.state) {
936 case KEY_SEEN:
937 if (matches(key, value)) {
938 if (store.seen == 1 && store.multi_replace == 0) {
939 warning("%s has multiple values", key);
940 } else if (store.seen >= MAX_MATCHES) {
941 error("too many matches for %s", key);
942 return 1;
945 store.offset[store.seen] = ftell(config_file);
946 store.seen++;
948 break;
949 case SECTION_SEEN:
951 * What we are looking for is in store.key (both
952 * section and var), and its section part is baselen
953 * long. We found key (again, both section and var).
954 * We would want to know if this key is in the same
955 * section as what we are looking for. We already
956 * know we are in the same section as what should
957 * hold store.key.
959 ep = strrchr(key, '.');
960 section_len = ep - key;
962 if ((section_len != store.baselen) ||
963 memcmp(key, store.key, section_len+1)) {
964 store.state = SECTION_END_SEEN;
965 break;
969 * Do not increment matches: this is no match, but we
970 * just made sure we are in the desired section.
972 store.offset[store.seen] = ftell(config_file);
973 /* fallthru */
974 case SECTION_END_SEEN:
975 case START:
976 if (matches(key, value)) {
977 store.offset[store.seen] = ftell(config_file);
978 store.state = KEY_SEEN;
979 store.seen++;
980 } else {
981 if (strrchr(key, '.') - key == store.baselen &&
982 !strncmp(key, store.key, store.baselen)) {
983 store.state = SECTION_SEEN;
984 store.offset[store.seen] = ftell(config_file);
988 return 0;
991 static int write_error(const char *filename)
993 error("failed to write new configuration file %s", filename);
995 /* Same error code as "failed to rename". */
996 return 4;
999 static int store_write_section(int fd, const char *key)
1001 const char *dot;
1002 int i, success;
1003 struct strbuf sb = STRBUF_INIT;
1005 dot = memchr(key, '.', store.baselen);
1006 if (dot) {
1007 strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1008 for (i = dot - key + 1; i < store.baselen; i++) {
1009 if (key[i] == '"' || key[i] == '\\')
1010 strbuf_addch(&sb, '\\');
1011 strbuf_addch(&sb, key[i]);
1013 strbuf_addstr(&sb, "\"]\n");
1014 } else {
1015 strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1018 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1019 strbuf_release(&sb);
1021 return success;
1024 static int store_write_pair(int fd, const char *key, const char *value)
1026 int i, success;
1027 int length = strlen(key + store.baselen + 1);
1028 const char *quote = "";
1029 struct strbuf sb = STRBUF_INIT;
1032 * Check to see if the value needs to be surrounded with a dq pair.
1033 * Note that problematic characters are always backslash-quoted; this
1034 * check is about not losing leading or trailing SP and strings that
1035 * follow beginning-of-comment characters (i.e. ';' and '#') by the
1036 * configuration parser.
1038 if (value[0] == ' ')
1039 quote = "\"";
1040 for (i = 0; value[i]; i++)
1041 if (value[i] == ';' || value[i] == '#')
1042 quote = "\"";
1043 if (i && value[i - 1] == ' ')
1044 quote = "\"";
1046 strbuf_addf(&sb, "\t%.*s = %s",
1047 length, key + store.baselen + 1, quote);
1049 for (i = 0; value[i]; i++)
1050 switch (value[i]) {
1051 case '\n':
1052 strbuf_addstr(&sb, "\\n");
1053 break;
1054 case '\t':
1055 strbuf_addstr(&sb, "\\t");
1056 break;
1057 case '"':
1058 case '\\':
1059 strbuf_addch(&sb, '\\');
1060 default:
1061 strbuf_addch(&sb, value[i]);
1062 break;
1064 strbuf_addf(&sb, "%s\n", quote);
1066 success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1067 strbuf_release(&sb);
1069 return success;
1072 static ssize_t find_beginning_of_line(const char *contents, size_t size,
1073 size_t offset_, int *found_bracket)
1075 size_t equal_offset = size, bracket_offset = size;
1076 ssize_t offset;
1078 contline:
1079 for (offset = offset_-2; offset > 0
1080 && contents[offset] != '\n'; offset--)
1081 switch (contents[offset]) {
1082 case '=': equal_offset = offset; break;
1083 case ']': bracket_offset = offset; break;
1085 if (offset > 0 && contents[offset-1] == '\\') {
1086 offset_ = offset;
1087 goto contline;
1089 if (bracket_offset < equal_offset) {
1090 *found_bracket = 1;
1091 offset = bracket_offset+1;
1092 } else
1093 offset++;
1095 return offset;
1098 int git_config_set(const char *key, const char *value)
1100 return git_config_set_multivar(key, value, NULL, 0);
1104 * Auxiliary function to sanity-check and split the key into the section
1105 * identifier and variable name.
1107 * Returns 0 on success, -1 when there is an invalid character in the key and
1108 * -2 if there is no section name in the key.
1110 * store_key - pointer to char* which will hold a copy of the key with
1111 * lowercase section and variable name
1112 * baselen - pointer to int which will hold the length of the
1113 * section + subsection part, can be NULL
1115 int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1117 int i, dot, baselen;
1118 const char *last_dot = strrchr(key, '.');
1121 * Since "key" actually contains the section name and the real
1122 * key name separated by a dot, we have to know where the dot is.
1125 if (last_dot == NULL || last_dot == key) {
1126 error("key does not contain a section: %s", key);
1127 return -2;
1130 if (!last_dot[1]) {
1131 error("key does not contain variable name: %s", key);
1132 return -2;
1135 baselen = last_dot - key;
1136 if (baselen_)
1137 *baselen_ = baselen;
1140 * Validate the key and while at it, lower case it for matching.
1142 *store_key = xmalloc(strlen(key) + 1);
1144 dot = 0;
1145 for (i = 0; key[i]; i++) {
1146 unsigned char c = key[i];
1147 if (c == '.')
1148 dot = 1;
1149 /* Leave the extended basename untouched.. */
1150 if (!dot || i > baselen) {
1151 if (!iskeychar(c) ||
1152 (i == baselen + 1 && !isalpha(c))) {
1153 error("invalid key: %s", key);
1154 goto out_free_ret_1;
1156 c = tolower(c);
1157 } else if (c == '\n') {
1158 error("invalid key (newline): %s", key);
1159 goto out_free_ret_1;
1161 (*store_key)[i] = c;
1163 (*store_key)[i] = 0;
1165 return 0;
1167 out_free_ret_1:
1168 free(*store_key);
1169 return -1;
1173 * If value==NULL, unset in (remove from) config,
1174 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1175 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1176 * else all matching key/values (regardless how many) are removed,
1177 * before the new pair is written.
1179 * Returns 0 on success.
1181 * This function does this:
1183 * - it locks the config file by creating ".git/config.lock"
1185 * - it then parses the config using store_aux() as validator to find
1186 * the position on the key/value pair to replace. If it is to be unset,
1187 * it must be found exactly once.
1189 * - the config file is mmap()ed and the part before the match (if any) is
1190 * written to the lock file, then the changed part and the rest.
1192 * - the config file is removed and the lock file rename()d to it.
1195 int git_config_set_multivar(const char *key, const char *value,
1196 const char *value_regex, int multi_replace)
1198 int fd = -1, in_fd;
1199 int ret;
1200 char *config_filename;
1201 struct lock_file *lock = NULL;
1203 if (config_exclusive_filename)
1204 config_filename = xstrdup(config_exclusive_filename);
1205 else
1206 config_filename = git_pathdup("config");
1208 /* parse-key returns negative; flip the sign to feed exit(3) */
1209 ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1210 if (ret)
1211 goto out_free;
1213 store.multi_replace = multi_replace;
1217 * The lock serves a purpose in addition to locking: the new
1218 * contents of .git/config will be written into it.
1220 lock = xcalloc(sizeof(struct lock_file), 1);
1221 fd = hold_lock_file_for_update(lock, config_filename, 0);
1222 if (fd < 0) {
1223 error("could not lock config file %s: %s", config_filename, strerror(errno));
1224 free(store.key);
1225 ret = -1;
1226 goto out_free;
1230 * If .git/config does not exist yet, write a minimal version.
1232 in_fd = open(config_filename, O_RDONLY);
1233 if ( in_fd < 0 ) {
1234 free(store.key);
1236 if ( ENOENT != errno ) {
1237 error("opening %s: %s", config_filename,
1238 strerror(errno));
1239 ret = 3; /* same as "invalid config file" */
1240 goto out_free;
1242 /* if nothing to unset, error out */
1243 if (value == NULL) {
1244 ret = 5;
1245 goto out_free;
1248 store.key = (char *)key;
1249 if (!store_write_section(fd, key) ||
1250 !store_write_pair(fd, key, value))
1251 goto write_err_out;
1252 } else {
1253 struct stat st;
1254 char *contents;
1255 size_t contents_sz, copy_begin, copy_end;
1256 int i, new_line = 0;
1258 if (value_regex == NULL)
1259 store.value_regex = NULL;
1260 else {
1261 if (value_regex[0] == '!') {
1262 store.do_not_match = 1;
1263 value_regex++;
1264 } else
1265 store.do_not_match = 0;
1267 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1268 if (regcomp(store.value_regex, value_regex,
1269 REG_EXTENDED)) {
1270 error("invalid pattern: %s", value_regex);
1271 free(store.value_regex);
1272 ret = 6;
1273 goto out_free;
1277 store.offset[0] = 0;
1278 store.state = START;
1279 store.seen = 0;
1282 * After this, store.offset will contain the *end* offset
1283 * of the last match, or remain at 0 if no match was found.
1284 * As a side effect, we make sure to transform only a valid
1285 * existing config file.
1287 if (git_config_from_file(store_aux, config_filename, NULL)) {
1288 error("invalid config file %s", config_filename);
1289 free(store.key);
1290 if (store.value_regex != NULL) {
1291 regfree(store.value_regex);
1292 free(store.value_regex);
1294 ret = 3;
1295 goto out_free;
1298 free(store.key);
1299 if (store.value_regex != NULL) {
1300 regfree(store.value_regex);
1301 free(store.value_regex);
1304 /* if nothing to unset, or too many matches, error out */
1305 if ((store.seen == 0 && value == NULL) ||
1306 (store.seen > 1 && multi_replace == 0)) {
1307 ret = 5;
1308 goto out_free;
1311 fstat(in_fd, &st);
1312 contents_sz = xsize_t(st.st_size);
1313 contents = xmmap(NULL, contents_sz, PROT_READ,
1314 MAP_PRIVATE, in_fd, 0);
1315 close(in_fd);
1317 if (store.seen == 0)
1318 store.seen = 1;
1320 for (i = 0, copy_begin = 0; i < store.seen; i++) {
1321 if (store.offset[i] == 0) {
1322 store.offset[i] = copy_end = contents_sz;
1323 } else if (store.state != KEY_SEEN) {
1324 copy_end = store.offset[i];
1325 } else
1326 copy_end = find_beginning_of_line(
1327 contents, contents_sz,
1328 store.offset[i]-2, &new_line);
1330 if (copy_end > 0 && contents[copy_end-1] != '\n')
1331 new_line = 1;
1333 /* write the first part of the config */
1334 if (copy_end > copy_begin) {
1335 if (write_in_full(fd, contents + copy_begin,
1336 copy_end - copy_begin) <
1337 copy_end - copy_begin)
1338 goto write_err_out;
1339 if (new_line &&
1340 write_str_in_full(fd, "\n") != 1)
1341 goto write_err_out;
1343 copy_begin = store.offset[i];
1346 /* write the pair (value == NULL means unset) */
1347 if (value != NULL) {
1348 if (store.state == START) {
1349 if (!store_write_section(fd, key))
1350 goto write_err_out;
1352 if (!store_write_pair(fd, key, value))
1353 goto write_err_out;
1356 /* write the rest of the config */
1357 if (copy_begin < contents_sz)
1358 if (write_in_full(fd, contents + copy_begin,
1359 contents_sz - copy_begin) <
1360 contents_sz - copy_begin)
1361 goto write_err_out;
1363 munmap(contents, contents_sz);
1366 if (commit_lock_file(lock) < 0) {
1367 error("could not commit config file %s", config_filename);
1368 ret = 4;
1369 goto out_free;
1373 * lock is committed, so don't try to roll it back below.
1374 * NOTE: Since lockfile.c keeps a linked list of all created
1375 * lock_file structures, it isn't safe to free(lock). It's
1376 * better to just leave it hanging around.
1378 lock = NULL;
1379 ret = 0;
1381 out_free:
1382 if (lock)
1383 rollback_lock_file(lock);
1384 free(config_filename);
1385 return ret;
1387 write_err_out:
1388 ret = write_error(lock->filename);
1389 goto out_free;
1393 static int section_name_match (const char *buf, const char *name)
1395 int i = 0, j = 0, dot = 0;
1396 if (buf[i] != '[')
1397 return 0;
1398 for (i = 1; buf[i] && buf[i] != ']'; i++) {
1399 if (!dot && isspace(buf[i])) {
1400 dot = 1;
1401 if (name[j++] != '.')
1402 break;
1403 for (i++; isspace(buf[i]); i++)
1404 ; /* do nothing */
1405 if (buf[i] != '"')
1406 break;
1407 continue;
1409 if (buf[i] == '\\' && dot)
1410 i++;
1411 else if (buf[i] == '"' && dot) {
1412 for (i++; isspace(buf[i]); i++)
1413 ; /* do_nothing */
1414 break;
1416 if (buf[i] != name[j++])
1417 break;
1419 if (buf[i] == ']' && name[j] == 0) {
1421 * We match, now just find the right length offset by
1422 * gobbling up any whitespace after it, as well
1424 i++;
1425 for (; buf[i] && isspace(buf[i]); i++)
1426 ; /* do nothing */
1427 return i;
1429 return 0;
1432 /* if new_name == NULL, the section is removed instead */
1433 int git_config_rename_section(const char *old_name, const char *new_name)
1435 int ret = 0, remove = 0;
1436 char *config_filename;
1437 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1438 int out_fd;
1439 char buf[1024];
1441 if (config_exclusive_filename)
1442 config_filename = xstrdup(config_exclusive_filename);
1443 else
1444 config_filename = git_pathdup("config");
1445 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1446 if (out_fd < 0) {
1447 ret = error("could not lock config file %s", config_filename);
1448 goto out;
1451 if (!(config_file = fopen(config_filename, "rb"))) {
1452 /* no config file means nothing to rename, no error */
1453 goto unlock_and_out;
1456 while (fgets(buf, sizeof(buf), config_file)) {
1457 int i;
1458 int length;
1459 char *output = buf;
1460 for (i = 0; buf[i] && isspace(buf[i]); i++)
1461 ; /* do nothing */
1462 if (buf[i] == '[') {
1463 /* it's a section */
1464 int offset = section_name_match(&buf[i], old_name);
1465 if (offset > 0) {
1466 ret++;
1467 if (new_name == NULL) {
1468 remove = 1;
1469 continue;
1471 store.baselen = strlen(new_name);
1472 if (!store_write_section(out_fd, new_name)) {
1473 ret = write_error(lock->filename);
1474 goto out;
1477 * We wrote out the new section, with
1478 * a newline, now skip the old
1479 * section's length
1481 output += offset + i;
1482 if (strlen(output) > 0) {
1484 * More content means there's
1485 * a declaration to put on the
1486 * next line; indent with a
1487 * tab
1489 output -= 1;
1490 output[0] = '\t';
1493 remove = 0;
1495 if (remove)
1496 continue;
1497 length = strlen(output);
1498 if (write_in_full(out_fd, output, length) != length) {
1499 ret = write_error(lock->filename);
1500 goto out;
1503 fclose(config_file);
1504 unlock_and_out:
1505 if (commit_lock_file(lock) < 0)
1506 ret = error("could not commit config file %s", config_filename);
1507 out:
1508 free(config_filename);
1509 return ret;
1513 * Call this to report error for your variable that should not
1514 * get a boolean value (i.e. "[my] var" means "true").
1516 int config_error_nonbool(const char *var)
1518 return error("Missing value for '%s'", var);