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#define MAXNAME (256)
11static FILE *config_file;
13static const char *config_file_name;
14static int config_linenr;
15static int get_next_char(void)
16{
17 int c;
18 FILE *f;
19 c = '\n';
21 if ((f = config_file) != NULL) {
22 c = fgetc(f);
23 if (c == '\r') {
24 /* DOS like systems */
25 c = fgetc(f);
26 if (c != '\n') {
27 ungetc(c, f);
28 c = '\r';
29 }
30 }
31 if (c == '\n')
32 config_linenr++;
33 if (c == EOF) {
34 config_file = NULL;
35 c = '\n';
36 }
37 }
38 return c;
39}
40static char *parse_value(void)
42{
43 static char value[1024];
44 int quote = 0, comment = 0, len = 0, space = 0;
45 for (;;) {
47 int c = get_next_char();
48 if (len >= sizeof(value))
49 return NULL;
50 if (c == '\n') {
51 if (quote)
52 return NULL;
53 value[len] = 0;
54 return value;
55 }
56 if (comment)
57 continue;
58 if (isspace(c) && !quote) {
59 space = 1;
60 continue;
61 }
62 if (!quote) {
63 if (c == ';' || c == '#') {
64 comment = 1;
65 continue;
66 }
67 }
68 if (space) {
69 if (len)
70 value[len++] = ' ';
71 space = 0;
72 }
73 if (c == '\\') {
74 c = get_next_char();
75 switch (c) {
76 case '\n':
77 continue;
78 case 't':
79 c = '\t';
80 break;
81 case 'b':
82 c = '\b';
83 break;
84 case 'n':
85 c = '\n';
86 break;
87 /* Some characters escape as themselves */
88 case '\\': case '"':
89 break;
90 /* Reject unknown escape sequences */
91 default:
92 return NULL;
93 }
94 value[len++] = c;
95 continue;
96 }
97 if (c == '"') {
98 quote = 1-quote;
99 continue;
100 }
101 value[len++] = c;
102 }
103}
104static inline int iskeychar(int c)
106{
107 return isalnum(c) || c == '-';
108}
109static int get_value(config_fn_t fn, char *name, unsigned int len)
111{
112 int c;
113 char *value;
114 /* Get the full name */
116 for (;;) {
117 c = get_next_char();
118 if (c == EOF)
119 break;
120 if (!iskeychar(c))
121 break;
122 name[len++] = tolower(c);
123 if (len >= MAXNAME)
124 return -1;
125 }
126 name[len] = 0;
127 while (c == ' ' || c == '\t')
128 c = get_next_char();
129 value = NULL;
131 if (c != '\n') {
132 if (c != '=')
133 return -1;
134 value = parse_value();
135 if (!value)
136 return -1;
137 }
138 return fn(name, value);
139}
140static int get_extended_base_var(char *name, int baselen, int c)
142{
143 do {
144 if (c == '\n')
145 return -1;
146 c = get_next_char();
147 } while (isspace(c));
148 /* We require the format to be '[base "extension"]' */
150 if (c != '"')
151 return -1;
152 name[baselen++] = '.';
153 for (;;) {
155 int c = get_next_char();
156 if (c == '\n')
157 return -1;
158 if (c == '"')
159 break;
160 if (c == '\\') {
161 c = get_next_char();
162 if (c == '\n')
163 return -1;
164 }
165 name[baselen++] = c;
166 if (baselen > MAXNAME / 2)
167 return -1;
168 }
169 /* Final ']' */
171 if (get_next_char() != ']')
172 return -1;
173 return baselen;
174}
175static int get_base_var(char *name)
177{
178 int baselen = 0;
179 for (;;) {
181 int c = get_next_char();
182 if (c == EOF)
183 return -1;
184 if (c == ']')
185 return baselen;
186 if (isspace(c))
187 return get_extended_base_var(name, baselen, c);
188 if (!iskeychar(c) && c != '.')
189 return -1;
190 if (baselen > MAXNAME / 2)
191 return -1;
192 name[baselen++] = tolower(c);
193 }
194}
195static int git_parse_file(config_fn_t fn)
197{
198 int comment = 0;
199 int baselen = 0;
200 static char var[MAXNAME];
201 for (;;) {
203 int c = get_next_char();
204 if (c == '\n') {
205 /* EOF? */
206 if (!config_file)
207 return 0;
208 comment = 0;
209 continue;
210 }
211 if (comment || isspace(c))
212 continue;
213 if (c == '#' || c == ';') {
214 comment = 1;
215 continue;
216 }
217 if (c == '[') {
218 baselen = get_base_var(var);
219 if (baselen <= 0)
220 break;
221 var[baselen++] = '.';
222 var[baselen] = 0;
223 continue;
224 }
225 if (!isalpha(c))
226 break;
227 var[baselen] = tolower(c);
228 if (get_value(fn, var, baselen+1) < 0)
229 break;
230 }
231 die("bad config file line %d in %s", config_linenr, config_file_name);
232}
233int git_config_int(const char *name, const char *value)
235{
236 if (value && *value) {
237 char *end;
238 int val = strtol(value, &end, 0);
239 if (!*end)
240 return val;
241 if (!strcasecmp(end, "k"))
242 return val * 1024;
243 if (!strcasecmp(end, "m"))
244 return val * 1024 * 1024;
245 if (!strcasecmp(end, "g"))
246 return val * 1024 * 1024 * 1024;
247 }
248 die("bad config value for '%s' in %s", name, config_file_name);
249}
250int git_config_bool(const char *name, const char *value)
252{
253 if (!value)
254 return 1;
255 if (!*value)
256 return 0;
257 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
258 return 1;
259 if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
260 return 0;
261 return git_config_int(name, value) != 0;
262}
263int git_default_config(const char *var, const char *value)
265{
266 /* This needs a better name */
267 if (!strcmp(var, "core.filemode")) {
268 trust_executable_bit = git_config_bool(var, value);
269 return 0;
270 }
271 if (!strcmp(var, "core.ignorestat")) {
273 assume_unchanged = git_config_bool(var, value);
274 return 0;
275 }
276 if (!strcmp(var, "core.prefersymlinkrefs")) {
278 prefer_symlink_refs = git_config_bool(var, value);
279 return 0;
280 }
281 if (!strcmp(var, "core.logallrefupdates")) {
283 log_all_ref_updates = git_config_bool(var, value);
284 return 0;
285 }
286 if (!strcmp(var, "core.warnambiguousrefs")) {
288 warn_ambiguous_refs = git_config_bool(var, value);
289 return 0;
290 }
291 if (!strcmp(var, "core.legacyheaders")) {
293 use_legacy_headers = git_config_bool(var, value);
294 return 0;
295 }
296 if (!strcmp(var, "core.compression")) {
298 int level = git_config_int(var, value);
299 if (level == -1)
300 level = Z_DEFAULT_COMPRESSION;
301 else if (level < 0 || level > Z_BEST_COMPRESSION)
302 die("bad zlib compression level %d", level);
303 zlib_compression_level = level;
304 return 0;
305 }
306 if (!strcmp(var, "user.name")) {
308 strlcpy(git_default_name, value, sizeof(git_default_name));
309 return 0;
310 }
311 if (!strcmp(var, "user.email")) {
313 strlcpy(git_default_email, value, sizeof(git_default_email));
314 return 0;
315 }
316 if (!strcmp(var, "i18n.commitencoding")) {
318 git_commit_encoding = strdup(value);
319 return 0;
320 }
321 if (!strcmp(var, "i18n.logoutputencoding")) {
323 git_log_output_encoding = strdup(value);
324 return 0;
325 }
326 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
329 pager_use_color = git_config_bool(var,value);
330 return 0;
331 }
332 /* Add other config variables here and to Documentation/config.txt. */
334 return 0;
335}
336int git_config_from_file(config_fn_t fn, const char *filename)
338{
339 int ret;
340 FILE *f = fopen(filename, "r");
341 ret = -1;
343 if (f) {
344 config_file = f;
345 config_file_name = filename;
346 config_linenr = 1;
347 ret = git_parse_file(fn);
348 fclose(f);
349 config_file_name = NULL;
350 }
351 return ret;
352}
353int git_config(config_fn_t fn)
355{
356 int ret = 0;
357 char *repo_config = NULL;
358 const char *home = NULL, *filename;
359 /* $GIT_CONFIG makes git read _only_ the given config file,
361 * $GIT_CONFIG_LOCAL will make it process it in addition to the
362 * global config file, the same way it would the per-repository
363 * config file otherwise. */
364 filename = getenv(CONFIG_ENVIRONMENT);
365 if (!filename) {
366 home = getenv("HOME");
367 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
368 if (!filename)
369 filename = repo_config = xstrdup(git_path("config"));
370 }
371 if (home) {
373 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
374 if (!access(user_config, R_OK))
375 ret = git_config_from_file(fn, user_config);
376 free(user_config);
377 }
378 ret += git_config_from_file(fn, filename);
380 free(repo_config);
381 return ret;
382}
383/*
385 * Find all the stuff for git_config_set() below.
386 */
387#define MAX_MATCHES 512
389static struct {
391 int baselen;
392 char* key;
393 int do_not_match;
394 regex_t* value_regex;
395 int multi_replace;
396 off_t offset[MAX_MATCHES];
397 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
398 int seen;
399} store;
400static int matches(const char* key, const char* value)
402{
403 return !strcmp(key, store.key) &&
404 (store.value_regex == NULL ||
405 (store.do_not_match ^
406 !regexec(store.value_regex, value, 0, NULL, 0)));
407}
408static int store_aux(const char* key, const char* value)
410{
411 switch (store.state) {
412 case KEY_SEEN:
413 if (matches(key, value)) {
414 if (store.seen == 1 && store.multi_replace == 0) {
415 fprintf(stderr,
416 "Warning: %s has multiple values\n",
417 key);
418 } else if (store.seen >= MAX_MATCHES) {
419 fprintf(stderr, "Too many matches\n");
420 return 1;
421 }
422 store.offset[store.seen] = ftell(config_file);
424 store.seen++;
425 }
426 break;
427 case SECTION_SEEN:
428 if (strncmp(key, store.key, store.baselen+1)) {
429 store.state = SECTION_END_SEEN;
430 break;
431 } else
432 /* do not increment matches: this is no match */
433 store.offset[store.seen] = ftell(config_file);
434 /* fallthru */
435 case SECTION_END_SEEN:
436 case START:
437 if (matches(key, value)) {
438 store.offset[store.seen] = ftell(config_file);
439 store.state = KEY_SEEN;
440 store.seen++;
441 } else {
442 if (strrchr(key, '.') - key == store.baselen &&
443 !strncmp(key, store.key, store.baselen)) {
444 store.state = SECTION_SEEN;
445 store.offset[store.seen] = ftell(config_file);
446 }
447 }
448 }
449 return 0;
450}
451static void store_write_section(int fd, const char* key)
453{
454 const char *dot = strchr(key, '.');
455 int len1 = store.baselen, len2 = -1;
456 dot = strchr(key, '.');
458 if (dot) {
459 int dotlen = dot - key;
460 if (dotlen < len1) {
461 len2 = len1 - dotlen - 1;
462 len1 = dotlen;
463 }
464 }
465 write(fd, "[", 1);
467 write(fd, key, len1);
468 if (len2 >= 0) {
469 write(fd, " \"", 2);
470 while (--len2 >= 0) {
471 unsigned char c = *++dot;
472 if (c == '"')
473 write(fd, "\\", 1);
474 write(fd, &c, 1);
475 }
476 write(fd, "\"", 1);
477 }
478 write(fd, "]\n", 2);
479}
480static void store_write_pair(int fd, const char* key, const char* value)
482{
483 int i;
484 write(fd, "\t", 1);
486 write(fd, key+store.baselen+1,
487 strlen(key+store.baselen+1));
488 write(fd, " = ", 3);
489 for (i = 0; value[i]; i++)
490 switch (value[i]) {
491 case '\n': write(fd, "\\n", 2); break;
492 case '\t': write(fd, "\\t", 2); break;
493 case '"': case '\\': write(fd, "\\", 1);
494 default: write(fd, value+i, 1);
495 }
496 write(fd, "\n", 1);
497}
498static int find_beginning_of_line(const char* contents, int size,
500 int offset_, int* found_bracket)
501{
502 int equal_offset = size, bracket_offset = size;
503 int offset;
504 for (offset = offset_-2; offset > 0
506 && contents[offset] != '\n'; offset--)
507 switch (contents[offset]) {
508 case '=': equal_offset = offset; break;
509 case ']': bracket_offset = offset; break;
510 }
511 if (bracket_offset < equal_offset) {
512 *found_bracket = 1;
513 offset = bracket_offset+1;
514 } else
515 offset++;
516 return offset;
518}
519int git_config_set(const char* key, const char* value)
521{
522 return git_config_set_multivar(key, value, NULL, 0);
523}
524/*
526 * If value==NULL, unset in (remove from) config,
527 * if value_regex!=NULL, disregard key/value pairs where value does not match.
528 * if multi_replace==0, nothing, or only one matching key/value is replaced,
529 * else all matching key/values (regardless how many) are removed,
530 * before the new pair is written.
531 *
532 * Returns 0 on success.
533 *
534 * This function does this:
535 *
536 * - it locks the config file by creating ".git/config.lock"
537 *
538 * - it then parses the config using store_aux() as validator to find
539 * the position on the key/value pair to replace. If it is to be unset,
540 * it must be found exactly once.
541 *
542 * - the config file is mmap()ed and the part before the match (if any) is
543 * written to the lock file, then the changed part and the rest.
544 *
545 * - the config file is removed and the lock file rename()d to it.
546 *
547 */
548int git_config_set_multivar(const char* key, const char* value,
549 const char* value_regex, int multi_replace)
550{
551 int i, dot;
552 int fd = -1, in_fd;
553 int ret;
554 char* config_filename;
555 char* lock_file;
556 const char* last_dot = strrchr(key, '.');
557 config_filename = getenv(CONFIG_ENVIRONMENT);
559 if (!config_filename) {
560 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
561 if (!config_filename)
562 config_filename = git_path("config");
563 }
564 config_filename = xstrdup(config_filename);
565 lock_file = xstrdup(mkpath("%s.lock", config_filename));
566 /*
568 * Since "key" actually contains the section name and the real
569 * key name separated by a dot, we have to know where the dot is.
570 */
571 if (last_dot == NULL) {
573 fprintf(stderr, "key does not contain a section: %s\n", key);
574 ret = 2;
575 goto out_free;
576 }
577 store.baselen = last_dot - key;
578 store.multi_replace = multi_replace;
580 /*
582 * Validate the key and while at it, lower case it for matching.
583 */
584 store.key = xmalloc(strlen(key) + 1);
585 dot = 0;
586 for (i = 0; key[i]; i++) {
587 unsigned char c = key[i];
588 if (c == '.')
589 dot = 1;
590 /* Leave the extended basename untouched.. */
591 if (!dot || i > store.baselen) {
592 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
593 fprintf(stderr, "invalid key: %s\n", key);
594 free(store.key);
595 ret = 1;
596 goto out_free;
597 }
598 c = tolower(c);
599 }
600 store.key[i] = c;
601 }
602 store.key[i] = 0;
603 /*
605 * The lock_file serves a purpose in addition to locking: the new
606 * contents of .git/config will be written into it.
607 */
608 fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
609 if (fd < 0 || adjust_shared_perm(lock_file)) {
610 fprintf(stderr, "could not lock config file\n");
611 free(store.key);
612 ret = -1;
613 goto out_free;
614 }
615 /*
617 * If .git/config does not exist yet, write a minimal version.
618 */
619 in_fd = open(config_filename, O_RDONLY);
620 if ( in_fd < 0 ) {
621 free(store.key);
622 if ( ENOENT != errno ) {
624 error("opening %s: %s", config_filename,
625 strerror(errno));
626 ret = 3; /* same as "invalid config file" */
627 goto out_free;
628 }
629 /* if nothing to unset, error out */
630 if (value == NULL) {
631 ret = 5;
632 goto out_free;
633 }
634 store.key = (char*)key;
636 store_write_section(fd, key);
637 store_write_pair(fd, key, value);
638 } else{
639 struct stat st;
640 char* contents;
641 int i, copy_begin, copy_end, new_line = 0;
642 if (value_regex == NULL)
644 store.value_regex = NULL;
645 else {
646 if (value_regex[0] == '!') {
647 store.do_not_match = 1;
648 value_regex++;
649 } else
650 store.do_not_match = 0;
651 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
653 if (regcomp(store.value_regex, value_regex,
654 REG_EXTENDED)) {
655 fprintf(stderr, "Invalid pattern: %s\n",
656 value_regex);
657 free(store.value_regex);
658 ret = 6;
659 goto out_free;
660 }
661 }
662 store.offset[0] = 0;
664 store.state = START;
665 store.seen = 0;
666 /*
668 * After this, store.offset will contain the *end* offset
669 * of the last match, or remain at 0 if no match was found.
670 * As a side effect, we make sure to transform only a valid
671 * existing config file.
672 */
673 if (git_config_from_file(store_aux, config_filename)) {
674 fprintf(stderr, "invalid config file\n");
675 free(store.key);
676 if (store.value_regex != NULL) {
677 regfree(store.value_regex);
678 free(store.value_regex);
679 }
680 ret = 3;
681 goto out_free;
682 }
683 free(store.key);
685 if (store.value_regex != NULL) {
686 regfree(store.value_regex);
687 free(store.value_regex);
688 }
689 /* if nothing to unset, or too many matches, error out */
691 if ((store.seen == 0 && value == NULL) ||
692 (store.seen > 1 && multi_replace == 0)) {
693 ret = 5;
694 goto out_free;
695 }
696 fstat(in_fd, &st);
698 contents = mmap(NULL, st.st_size, PROT_READ,
699 MAP_PRIVATE, in_fd, 0);
700 close(in_fd);
701 if (store.seen == 0)
703 store.seen = 1;
704 for (i = 0, copy_begin = 0; i < store.seen; i++) {
706 if (store.offset[i] == 0) {
707 store.offset[i] = copy_end = st.st_size;
708 } else if (store.state != KEY_SEEN) {
709 copy_end = store.offset[i];
710 } else
711 copy_end = find_beginning_of_line(
712 contents, st.st_size,
713 store.offset[i]-2, &new_line);
714 /* write the first part of the config */
716 if (copy_end > copy_begin) {
717 write(fd, contents + copy_begin,
718 copy_end - copy_begin);
719 if (new_line)
720 write(fd, "\n", 1);
721 }
722 copy_begin = store.offset[i];
723 }
724 /* write the pair (value == NULL means unset) */
726 if (value != NULL) {
727 if (store.state == START)
728 store_write_section(fd, key);
729 store_write_pair(fd, key, value);
730 }
731 /* write the rest of the config */
733 if (copy_begin < st.st_size)
734 write(fd, contents + copy_begin,
735 st.st_size - copy_begin);
736 munmap(contents, st.st_size);
738 unlink(config_filename);
739 }
740 if (rename(lock_file, config_filename) < 0) {
742 fprintf(stderr, "Could not rename the lock file?\n");
743 ret = 4;
744 goto out_free;
745 }
746 ret = 0;
748out_free:
750 if (0 <= fd)
751 close(fd);
752 free(config_filename);
753 if (lock_file) {
754 unlink(lock_file);
755 free(lock_file);
756 }
757 return ret;
758}
759int git_config_rename_section(const char *old_name, const char *new_name)
761{
762 int ret = 0;
763 char *config_filename;
764 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
765 int out_fd;
766 char buf[1024];
767 config_filename = getenv(CONFIG_ENVIRONMENT);
769 if (!config_filename) {
770 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
771 if (!config_filename)
772 config_filename = git_path("config");
773 }
774 config_filename = xstrdup(config_filename);
775 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
776 if (out_fd < 0) {
777 ret = error("Could not lock config file!");
778 goto out;
779 }
780 if (!(config_file = fopen(config_filename, "rb"))) {
782 ret = error("Could not open config file!");
783 goto out;
784 }
785 while (fgets(buf, sizeof(buf), config_file)) {
787 int i;
788 for (i = 0; buf[i] && isspace(buf[i]); i++)
789 ; /* do nothing */
790 if (buf[i] == '[') {
791 /* it's a section */
792 int j = 0, dot = 0;
793 for (i++; buf[i] && buf[i] != ']'; i++) {
794 if (!dot && isspace(buf[i])) {
795 dot = 1;
796 if (old_name[j++] != '.')
797 break;
798 for (i++; isspace(buf[i]); i++)
799 ; /* do nothing */
800 if (buf[i] != '"')
801 break;
802 continue;
803 }
804 if (buf[i] == '\\' && dot)
805 i++;
806 else if (buf[i] == '"' && dot) {
807 for (i++; isspace(buf[i]); i++)
808 ; /* do_nothing */
809 break;
810 }
811 if (buf[i] != old_name[j++])
812 break;
813 }
814 if (buf[i] == ']') {
815 /* old_name matches */
816 ret++;
817 store.baselen = strlen(new_name);
818 store_write_section(out_fd, new_name);
819 continue;
820 }
821 }
822 write(out_fd, buf, strlen(buf));
823 }
824 fclose(config_file);
825 if (close(out_fd) || commit_lock_file(lock) < 0)
826 ret = error("Cannot commit config file!");
827 out:
828 free(config_filename);
829 return ret;
830}
831