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, "core.packedgitwindowsize")) {
308 int pgsz = getpagesize();
309 packed_git_window_size = git_config_int(var, value);
310 packed_git_window_size /= pgsz;
311 if (packed_git_window_size < 2)
312 packed_git_window_size = 2;
313 packed_git_window_size *= pgsz;
314 return 0;
315 }
316 if (!strcmp(var, "core.packedgitlimit")) {
318 packed_git_limit = git_config_int(var, value);
319 return 0;
320 }
321 if (!strcmp(var, "user.name")) {
323 strlcpy(git_default_name, value, sizeof(git_default_name));
324 return 0;
325 }
326 if (!strcmp(var, "user.email")) {
328 strlcpy(git_default_email, value, sizeof(git_default_email));
329 return 0;
330 }
331 if (!strcmp(var, "i18n.commitencoding")) {
333 git_commit_encoding = strdup(value);
334 return 0;
335 }
336 if (!strcmp(var, "i18n.logoutputencoding")) {
338 git_log_output_encoding = strdup(value);
339 return 0;
340 }
341 if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
344 pager_use_color = git_config_bool(var,value);
345 return 0;
346 }
347 /* Add other config variables here and to Documentation/config.txt. */
349 return 0;
350}
351int git_config_from_file(config_fn_t fn, const char *filename)
353{
354 int ret;
355 FILE *f = fopen(filename, "r");
356 ret = -1;
358 if (f) {
359 config_file = f;
360 config_file_name = filename;
361 config_linenr = 1;
362 ret = git_parse_file(fn);
363 fclose(f);
364 config_file_name = NULL;
365 }
366 return ret;
367}
368int git_config(config_fn_t fn)
370{
371 int ret = 0;
372 char *repo_config = NULL;
373 const char *home = NULL, *filename;
374 /* $GIT_CONFIG makes git read _only_ the given config file,
376 * $GIT_CONFIG_LOCAL will make it process it in addition to the
377 * global config file, the same way it would the per-repository
378 * config file otherwise. */
379 filename = getenv(CONFIG_ENVIRONMENT);
380 if (!filename) {
381 home = getenv("HOME");
382 filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
383 if (!filename)
384 filename = repo_config = xstrdup(git_path("config"));
385 }
386 if (home) {
388 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
389 if (!access(user_config, R_OK))
390 ret = git_config_from_file(fn, user_config);
391 free(user_config);
392 }
393 ret += git_config_from_file(fn, filename);
395 free(repo_config);
396 return ret;
397}
398/*
400 * Find all the stuff for git_config_set() below.
401 */
402#define MAX_MATCHES 512
404static struct {
406 int baselen;
407 char* key;
408 int do_not_match;
409 regex_t* value_regex;
410 int multi_replace;
411 off_t offset[MAX_MATCHES];
412 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
413 int seen;
414} store;
415static int matches(const char* key, const char* value)
417{
418 return !strcmp(key, store.key) &&
419 (store.value_regex == NULL ||
420 (store.do_not_match ^
421 !regexec(store.value_regex, value, 0, NULL, 0)));
422}
423static int store_aux(const char* key, const char* value)
425{
426 switch (store.state) {
427 case KEY_SEEN:
428 if (matches(key, value)) {
429 if (store.seen == 1 && store.multi_replace == 0) {
430 fprintf(stderr,
431 "Warning: %s has multiple values\n",
432 key);
433 } else if (store.seen >= MAX_MATCHES) {
434 fprintf(stderr, "Too many matches\n");
435 return 1;
436 }
437 store.offset[store.seen] = ftell(config_file);
439 store.seen++;
440 }
441 break;
442 case SECTION_SEEN:
443 if (strncmp(key, store.key, store.baselen+1)) {
444 store.state = SECTION_END_SEEN;
445 break;
446 } else
447 /* do not increment matches: this is no match */
448 store.offset[store.seen] = ftell(config_file);
449 /* fallthru */
450 case SECTION_END_SEEN:
451 case START:
452 if (matches(key, value)) {
453 store.offset[store.seen] = ftell(config_file);
454 store.state = KEY_SEEN;
455 store.seen++;
456 } else {
457 if (strrchr(key, '.') - key == store.baselen &&
458 !strncmp(key, store.key, store.baselen)) {
459 store.state = SECTION_SEEN;
460 store.offset[store.seen] = ftell(config_file);
461 }
462 }
463 }
464 return 0;
465}
466static int write_error()
468{
469 fprintf(stderr, "Failed to write new configuration file\n");
470 /* Same error code as "failed to rename". */
472 return 4;
473}
474static int store_write_section(int fd, const char* key)
476{
477 const char *dot = strchr(key, '.');
478 int len1 = store.baselen, len2 = -1;
479 dot = strchr(key, '.');
481 if (dot) {
482 int dotlen = dot - key;
483 if (dotlen < len1) {
484 len2 = len1 - dotlen - 1;
485 len1 = dotlen;
486 }
487 }
488 if (write_in_full(fd, "[", 1) != 1 ||
490 write_in_full(fd, key, len1) != len1)
491 return 0;
492 if (len2 >= 0) {
493 if (write_in_full(fd, " \"", 2) != 2)
494 return 0;
495 while (--len2 >= 0) {
496 unsigned char c = *++dot;
497 if (c == '"')
498 if (write_in_full(fd, "\\", 1) != 1)
499 return 0;
500 if (write_in_full(fd, &c, 1) != 1)
501 return 0;
502 }
503 if (write_in_full(fd, "\"", 1) != 1)
504 return 0;
505 }
506 if (write_in_full(fd, "]\n", 2) != 2)
507 return 0;
508 return 1;
510}
511static int store_write_pair(int fd, const char* key, const char* value)
513{
514 int i;
515 int length = strlen(key+store.baselen+1);
516 if (write_in_full(fd, "\t", 1) != 1 ||
518 write_in_full(fd, key+store.baselen+1, length) != length ||
519 write_in_full(fd, " = ", 3) != 3)
520 return 0;
521 for (i = 0; value[i]; i++)
522 switch (value[i]) {
523 case '\n':
524 if (write_in_full(fd, "\\n", 2) != 2)
525 return 0;
526 break;
527 case '\t':
528 if (write_in_full(fd, "\\t", 2) != 2)
529 return 0;
530 break;
531 case '"':
532 case '\\':
533 if (write_in_full(fd, "\\", 1) != 1)
534 return 0;
535 default:
536 if (write_in_full(fd, value+i, 1) != 1)
537 return 0;
538 break;
539 }
540 if (write_in_full(fd, "\n", 1) != 1)
541 return 0;
542 return 1;
543}
544static int find_beginning_of_line(const char* contents, int size,
546 int offset_, int* found_bracket)
547{
548 int equal_offset = size, bracket_offset = size;
549 int offset;
550 for (offset = offset_-2; offset > 0
552 && contents[offset] != '\n'; offset--)
553 switch (contents[offset]) {
554 case '=': equal_offset = offset; break;
555 case ']': bracket_offset = offset; break;
556 }
557 if (bracket_offset < equal_offset) {
558 *found_bracket = 1;
559 offset = bracket_offset+1;
560 } else
561 offset++;
562 return offset;
564}
565int git_config_set(const char* key, const char* value)
567{
568 return git_config_set_multivar(key, value, NULL, 0);
569}
570/*
572 * If value==NULL, unset in (remove from) config,
573 * if value_regex!=NULL, disregard key/value pairs where value does not match.
574 * if multi_replace==0, nothing, or only one matching key/value is replaced,
575 * else all matching key/values (regardless how many) are removed,
576 * before the new pair is written.
577 *
578 * Returns 0 on success.
579 *
580 * This function does this:
581 *
582 * - it locks the config file by creating ".git/config.lock"
583 *
584 * - it then parses the config using store_aux() as validator to find
585 * the position on the key/value pair to replace. If it is to be unset,
586 * it must be found exactly once.
587 *
588 * - the config file is mmap()ed and the part before the match (if any) is
589 * written to the lock file, then the changed part and the rest.
590 *
591 * - the config file is removed and the lock file rename()d to it.
592 *
593 */
594int git_config_set_multivar(const char* key, const char* value,
595 const char* value_regex, int multi_replace)
596{
597 int i, dot;
598 int fd = -1, in_fd;
599 int ret;
600 char* config_filename;
601 char* lock_file;
602 const char* last_dot = strrchr(key, '.');
603 config_filename = getenv(CONFIG_ENVIRONMENT);
605 if (!config_filename) {
606 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
607 if (!config_filename)
608 config_filename = git_path("config");
609 }
610 config_filename = xstrdup(config_filename);
611 lock_file = xstrdup(mkpath("%s.lock", config_filename));
612 /*
614 * Since "key" actually contains the section name and the real
615 * key name separated by a dot, we have to know where the dot is.
616 */
617 if (last_dot == NULL) {
619 fprintf(stderr, "key does not contain a section: %s\n", key);
620 ret = 2;
621 goto out_free;
622 }
623 store.baselen = last_dot - key;
624 store.multi_replace = multi_replace;
626 /*
628 * Validate the key and while at it, lower case it for matching.
629 */
630 store.key = xmalloc(strlen(key) + 1);
631 dot = 0;
632 for (i = 0; key[i]; i++) {
633 unsigned char c = key[i];
634 if (c == '.')
635 dot = 1;
636 /* Leave the extended basename untouched.. */
637 if (!dot || i > store.baselen) {
638 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
639 fprintf(stderr, "invalid key: %s\n", key);
640 free(store.key);
641 ret = 1;
642 goto out_free;
643 }
644 c = tolower(c);
645 }
646 store.key[i] = c;
647 }
648 store.key[i] = 0;
649 /*
651 * The lock_file serves a purpose in addition to locking: the new
652 * contents of .git/config will be written into it.
653 */
654 fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
655 if (fd < 0 || adjust_shared_perm(lock_file)) {
656 fprintf(stderr, "could not lock config file\n");
657 free(store.key);
658 ret = -1;
659 goto out_free;
660 }
661 /*
663 * If .git/config does not exist yet, write a minimal version.
664 */
665 in_fd = open(config_filename, O_RDONLY);
666 if ( in_fd < 0 ) {
667 free(store.key);
668 if ( ENOENT != errno ) {
670 error("opening %s: %s", config_filename,
671 strerror(errno));
672 ret = 3; /* same as "invalid config file" */
673 goto out_free;
674 }
675 /* if nothing to unset, error out */
676 if (value == NULL) {
677 ret = 5;
678 goto out_free;
679 }
680 store.key = (char*)key;
682 if (!store_write_section(fd, key) ||
683 !store_write_pair(fd, key, value)) {
684 ret = write_error();
685 goto out_free;
686 }
687 } else{
688 struct stat st;
689 char* contents;
690 int i, copy_begin, copy_end, new_line = 0;
691 if (value_regex == NULL)
693 store.value_regex = NULL;
694 else {
695 if (value_regex[0] == '!') {
696 store.do_not_match = 1;
697 value_regex++;
698 } else
699 store.do_not_match = 0;
700 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
702 if (regcomp(store.value_regex, value_regex,
703 REG_EXTENDED)) {
704 fprintf(stderr, "Invalid pattern: %s\n",
705 value_regex);
706 free(store.value_regex);
707 ret = 6;
708 goto out_free;
709 }
710 }
711 store.offset[0] = 0;
713 store.state = START;
714 store.seen = 0;
715 /*
717 * After this, store.offset will contain the *end* offset
718 * of the last match, or remain at 0 if no match was found.
719 * As a side effect, we make sure to transform only a valid
720 * existing config file.
721 */
722 if (git_config_from_file(store_aux, config_filename)) {
723 fprintf(stderr, "invalid config file\n");
724 free(store.key);
725 if (store.value_regex != NULL) {
726 regfree(store.value_regex);
727 free(store.value_regex);
728 }
729 ret = 3;
730 goto out_free;
731 }
732 free(store.key);
734 if (store.value_regex != NULL) {
735 regfree(store.value_regex);
736 free(store.value_regex);
737 }
738 /* if nothing to unset, or too many matches, error out */
740 if ((store.seen == 0 && value == NULL) ||
741 (store.seen > 1 && multi_replace == 0)) {
742 ret = 5;
743 goto out_free;
744 }
745 fstat(in_fd, &st);
747 contents = xmmap(NULL, st.st_size, PROT_READ,
748 MAP_PRIVATE, in_fd, 0);
749 close(in_fd);
750 if (store.seen == 0)
752 store.seen = 1;
753 for (i = 0, copy_begin = 0; i < store.seen; i++) {
755 if (store.offset[i] == 0) {
756 store.offset[i] = copy_end = st.st_size;
757 } else if (store.state != KEY_SEEN) {
758 copy_end = store.offset[i];
759 } else
760 copy_end = find_beginning_of_line(
761 contents, st.st_size,
762 store.offset[i]-2, &new_line);
763 /* write the first part of the config */
765 if (copy_end > copy_begin) {
766 write_in_full(fd, contents + copy_begin,
767 copy_end - copy_begin);
768 if (new_line)
769 write_in_full(fd, "\n", 1);
770 }
771 copy_begin = store.offset[i];
772 }
773 /* write the pair (value == NULL means unset) */
775 if (value != NULL) {
776 if (store.state == START)
777 if (!store_write_section(fd, key)) {
778 ret = write_error();
779 goto out_free;
780 }
781 if (!store_write_pair(fd, key, value)) {
782 ret = write_error();
783 goto out_free;
784 }
785 }
786 /* write the rest of the config */
788 if (copy_begin < st.st_size)
789 write_in_full(fd, contents + copy_begin,
790 st.st_size - copy_begin);
791 munmap(contents, st.st_size);
793 unlink(config_filename);
794 }
795 if (rename(lock_file, config_filename) < 0) {
797 fprintf(stderr, "Could not rename the lock file?\n");
798 ret = 4;
799 goto out_free;
800 }
801 ret = 0;
803out_free:
805 if (0 <= fd)
806 close(fd);
807 free(config_filename);
808 if (lock_file) {
809 unlink(lock_file);
810 free(lock_file);
811 }
812 return ret;
813}
814int git_config_rename_section(const char *old_name, const char *new_name)
816{
817 int ret = 0;
818 char *config_filename;
819 struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
820 int out_fd;
821 char buf[1024];
822 config_filename = getenv(CONFIG_ENVIRONMENT);
824 if (!config_filename) {
825 config_filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
826 if (!config_filename)
827 config_filename = git_path("config");
828 }
829 config_filename = xstrdup(config_filename);
830 out_fd = hold_lock_file_for_update(lock, config_filename, 0);
831 if (out_fd < 0) {
832 ret = error("Could not lock config file!");
833 goto out;
834 }
835 if (!(config_file = fopen(config_filename, "rb"))) {
837 ret = error("Could not open config file!");
838 goto out;
839 }
840 while (fgets(buf, sizeof(buf), config_file)) {
842 int i;
843 int length;
844 for (i = 0; buf[i] && isspace(buf[i]); i++)
845 ; /* do nothing */
846 if (buf[i] == '[') {
847 /* it's a section */
848 int j = 0, dot = 0;
849 for (i++; buf[i] && buf[i] != ']'; i++) {
850 if (!dot && isspace(buf[i])) {
851 dot = 1;
852 if (old_name[j++] != '.')
853 break;
854 for (i++; isspace(buf[i]); i++)
855 ; /* do nothing */
856 if (buf[i] != '"')
857 break;
858 continue;
859 }
860 if (buf[i] == '\\' && dot)
861 i++;
862 else if (buf[i] == '"' && dot) {
863 for (i++; isspace(buf[i]); i++)
864 ; /* do_nothing */
865 break;
866 }
867 if (buf[i] != old_name[j++])
868 break;
869 }
870 if (buf[i] == ']') {
871 /* old_name matches */
872 ret++;
873 store.baselen = strlen(new_name);
874 if (!store_write_section(out_fd, new_name)) {
875 ret = write_error();
876 goto out;
877 }
878 continue;
879 }
880 }
881 length = strlen(buf);
882 if (write_in_full(out_fd, buf, length) != length) {
883 ret = write_error();
884 goto out;
885 }
886 }
887 fclose(config_file);
888 if (close(out_fd) || commit_lock_file(lock) < 0)
889 ret = error("Cannot commit config file!");
890 out:
891 free(config_filename);
892 return ret;
893}
894