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 <regex.h>
10#define MAXNAME (256)
12static FILE *config_file;
14static const char *config_file_name;
15static int config_linenr;
16static int get_next_char(void)
17{
18 int c;
19 FILE *f;
20 c = '\n';
22 if ((f = config_file) != NULL) {
23 c = fgetc(f);
24 if (c == '\r') {
25 /* DOS like systems */
26 c = fgetc(f);
27 if (c != '\n') {
28 ungetc(c, f);
29 c = '\r';
30 }
31 }
32 if (c == '\n')
33 config_linenr++;
34 if (c == EOF) {
35 config_file = NULL;
36 c = '\n';
37 }
38 }
39 return c;
40}
41static char *parse_value(void)
43{
44 static char value[1024];
45 int quote = 0, comment = 0, len = 0, space = 0;
46 for (;;) {
48 int c = get_next_char();
49 if (len >= sizeof(value))
50 return NULL;
51 if (c == '\n') {
52 if (quote)
53 return NULL;
54 value[len] = 0;
55 return value;
56 }
57 if (comment)
58 continue;
59 if (isspace(c) && !quote) {
60 space = 1;
61 continue;
62 }
63 if (!quote) {
64 if (c == ';' || c == '#') {
65 comment = 1;
66 continue;
67 }
68 }
69 if (space) {
70 if (len)
71 value[len++] = ' ';
72 space = 0;
73 }
74 if (c == '\\') {
75 c = get_next_char();
76 switch (c) {
77 case '\n':
78 continue;
79 case 't':
80 c = '\t';
81 break;
82 case 'b':
83 c = '\b';
84 break;
85 case 'n':
86 c = '\n';
87 break;
88 /* Some characters escape as themselves */
89 case '\\': case '"':
90 break;
91 /* Reject unknown escape sequences */
92 default:
93 return NULL;
94 }
95 value[len++] = c;
96 continue;
97 }
98 if (c == '"') {
99 quote = 1-quote;
100 continue;
101 }
102 value[len++] = c;
103 }
104}
105static inline int iskeychar(int c)
107{
108 return isalnum(c) || c == '-';
109}
110static int get_value(config_fn_t fn, char *name, unsigned int len)
112{
113 int c;
114 char *value;
115 /* Get the full name */
117 for (;;) {
118 c = get_next_char();
119 if (c == EOF)
120 break;
121 if (!iskeychar(c))
122 break;
123 name[len++] = tolower(c);
124 if (len >= MAXNAME)
125 return -1;
126 }
127 name[len] = 0;
128 while (c == ' ' || c == '\t')
129 c = get_next_char();
130 value = NULL;
132 if (c != '\n') {
133 if (c != '=')
134 return -1;
135 value = parse_value();
136 if (!value)
137 return -1;
138 }
139 return fn(name, value);
140}
141static int get_extended_base_var(char *name, int baselen, int c)
143{
144 do {
145 if (c == '\n')
146 return -1;
147 c = get_next_char();
148 } while (isspace(c));
149 /* We require the format to be '[base "extension"]' */
151 if (c != '"')
152 return -1;
153 name[baselen++] = '.';
154 for (;;) {
156 int c = get_next_char();
157 if (c == '\n')
158 return -1;
159 if (c == '"')
160 break;
161 if (c == '\\') {
162 c = get_next_char();
163 if (c == '\n')
164 return -1;
165 }
166 name[baselen++] = c;
167 if (baselen > MAXNAME / 2)
168 return -1;
169 }
170 /* Final ']' */
172 if (get_next_char() != ']')
173 return -1;
174 return baselen;
175}
176static int get_base_var(char *name)
178{
179 int baselen = 0;
180 for (;;) {
182 int c = get_next_char();
183 if (c == EOF)
184 return -1;
185 if (c == ']')
186 return baselen;
187 if (isspace(c))
188 return get_extended_base_var(name, baselen, c);
189 if (!iskeychar(c) && c != '.')
190 return -1;
191 if (baselen > MAXNAME / 2)
192 return -1;
193 name[baselen++] = tolower(c);
194 }
195}
196static int git_parse_file(config_fn_t fn)
198{
199 int comment = 0;
200 int baselen = 0;
201 static char var[MAXNAME];
202 for (;;) {
204 int c = get_next_char();
205 if (c == '\n') {
206 /* EOF? */
207 if (!config_file)
208 return 0;
209 comment = 0;
210 continue;
211 }
212 if (comment || isspace(c))
213 continue;
214 if (c == '#' || c == ';') {
215 comment = 1;
216 continue;
217 }
218 if (c == '[') {
219 baselen = get_base_var(var);
220 if (baselen <= 0)
221 break;
222 var[baselen++] = '.';
223 var[baselen] = 0;
224 continue;
225 }
226 if (!isalpha(c))
227 break;
228 var[baselen] = tolower(c);
229 if (get_value(fn, var, baselen+1) < 0)
230 break;
231 }
232 die("bad config file line %d in %s", config_linenr, config_file_name);
233}
234int git_config_int(const char *name, const char *value)
236{
237 if (value && *value) {
238 char *end;
239 int val = strtol(value, &end, 0);
240 if (!*end)
241 return val;
242 }
243 die("bad config value for '%s' in %s", name, config_file_name);
244}
245int git_config_bool(const char *name, const char *value)
247{
248 if (!value)
249 return 1;
250 if (!*value)
251 return 0;
252 if (!strcasecmp(value, "true") || !strcasecmp(value, "yes"))
253 return 1;
254 if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
255 return 0;
256 return git_config_int(name, value) != 0;
257}
258int git_default_config(const char *var, const char *value)
260{
261 /* This needs a better name */
262 if (!strcmp(var, "core.filemode")) {
263 trust_executable_bit = git_config_bool(var, value);
264 return 0;
265 }
266 if (!strcmp(var, "core.ignorestat")) {
268 assume_unchanged = git_config_bool(var, value);
269 return 0;
270 }
271 if (!strcmp(var, "core.prefersymlinkrefs")) {
273 prefer_symlink_refs = git_config_bool(var, value);
274 return 0;
275 }
276 if (!strcmp(var, "core.logallrefupdates")) {
278 log_all_ref_updates = git_config_bool(var, value);
279 return 0;
280 }
281 if (!strcmp(var, "core.warnambiguousrefs")) {
283 warn_ambiguous_refs = git_config_bool(var, value);
284 return 0;
285 }
286 if (!strcmp(var, "core.legacyheaders")) {
288 use_legacy_headers = git_config_bool(var, value);
289 return 0;
290 }
291 if (!strcmp(var, "core.compression")) {
293 int level = git_config_int(var, value);
294 if (level == -1)
295 level = Z_DEFAULT_COMPRESSION;
296 else if (level < 0 || level > Z_BEST_COMPRESSION)
297 die("bad zlib compression level %d", level);
298 zlib_compression_level = level;
299 return 0;
300 }
301 if (!strcmp(var, "user.name")) {
303 strlcpy(git_default_name, value, sizeof(git_default_name));
304 return 0;
305 }
306 if (!strcmp(var, "user.email")) {
308 strlcpy(git_default_email, value, sizeof(git_default_email));
309 return 0;
310 }
311 if (!strcmp(var, "i18n.commitencoding")) {
313 strlcpy(git_commit_encoding, value, sizeof(git_commit_encoding));
314 return 0;
315 }
316 if (!strcmp(var, "pager.color")) {
318 pager_use_color = git_config_bool(var,value);
319 return 0;
320 }
321 /* Add other config variables here and to Documentation/config.txt. */
323 return 0;
324}
325int git_config_from_file(config_fn_t fn, const char *filename)
327{
328 int ret;
329 FILE *f = fopen(filename, "r");
330 ret = -1;
332 if (f) {
333 config_file = f;
334 config_file_name = filename;
335 config_linenr = 1;
336 ret = git_parse_file(fn);
337 fclose(f);
338 config_file_name = NULL;
339 }
340 return ret;
341}
342int git_config(config_fn_t fn)
344{
345 int ret = 0;
346 char *repo_config = NULL;
347 const char *home = NULL, *filename;
348 /* $GIT_CONFIG makes git read _only_ the given config file,
350 * $GIT_CONFIG_LOCAL will make it process it in addition to the
351 * global config file, the same way it would the per-repository
352 * config file otherwise. */
353 filename = getenv("GIT_CONFIG");
354 if (!filename) {
355 home = getenv("HOME");
356 filename = getenv("GIT_CONFIG_LOCAL");
357 if (!filename)
358 filename = repo_config = xstrdup(git_path("config"));
359 }
360 if (home) {
362 char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
363 if (!access(user_config, R_OK))
364 ret = git_config_from_file(fn, user_config);
365 free(user_config);
366 }
367 ret += git_config_from_file(fn, filename);
369 free(repo_config);
370 return ret;
371}
372/*
374 * Find all the stuff for git_config_set() below.
375 */
376#define MAX_MATCHES 512
378static struct {
380 int baselen;
381 char* key;
382 int do_not_match;
383 regex_t* value_regex;
384 int multi_replace;
385 off_t offset[MAX_MATCHES];
386 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
387 int seen;
388} store;
389static int matches(const char* key, const char* value)
391{
392 return !strcmp(key, store.key) &&
393 (store.value_regex == NULL ||
394 (store.do_not_match ^
395 !regexec(store.value_regex, value, 0, NULL, 0)));
396}
397static int store_aux(const char* key, const char* value)
399{
400 switch (store.state) {
401 case KEY_SEEN:
402 if (matches(key, value)) {
403 if (store.seen == 1 && store.multi_replace == 0) {
404 fprintf(stderr,
405 "Warning: %s has multiple values\n",
406 key);
407 } else if (store.seen >= MAX_MATCHES) {
408 fprintf(stderr, "Too many matches\n");
409 return 1;
410 }
411 store.offset[store.seen] = ftell(config_file);
413 store.seen++;
414 }
415 break;
416 case SECTION_SEEN:
417 if (strncmp(key, store.key, store.baselen+1)) {
418 store.state = SECTION_END_SEEN;
419 break;
420 } else
421 /* do not increment matches: this is no match */
422 store.offset[store.seen] = ftell(config_file);
423 /* fallthru */
424 case SECTION_END_SEEN:
425 case START:
426 if (matches(key, value)) {
427 store.offset[store.seen] = ftell(config_file);
428 store.state = KEY_SEEN;
429 store.seen++;
430 } else {
431 if (strrchr(key, '.') - key == store.baselen &&
432 !strncmp(key, store.key, store.baselen)) {
433 store.state = SECTION_SEEN;
434 store.offset[store.seen] = ftell(config_file);
435 }
436 }
437 }
438 return 0;
439}
440static void store_write_section(int fd, const char* key)
442{
443 const char *dot = strchr(key, '.');
444 int len1 = store.baselen, len2 = -1;
445 dot = strchr(key, '.');
447 if (dot) {
448 int dotlen = dot - key;
449 if (dotlen < len1) {
450 len2 = len1 - dotlen - 1;
451 len1 = dotlen;
452 }
453 }
454 write(fd, "[", 1);
456 write(fd, key, len1);
457 if (len2 >= 0) {
458 write(fd, " \"", 2);
459 while (--len2 >= 0) {
460 unsigned char c = *++dot;
461 if (c == '"')
462 write(fd, "\\", 1);
463 write(fd, &c, 1);
464 }
465 write(fd, "\"", 1);
466 }
467 write(fd, "]\n", 2);
468}
469static void store_write_pair(int fd, const char* key, const char* value)
471{
472 int i;
473 write(fd, "\t", 1);
475 write(fd, key+store.baselen+1,
476 strlen(key+store.baselen+1));
477 write(fd, " = ", 3);
478 for (i = 0; value[i]; i++)
479 switch (value[i]) {
480 case '\n': write(fd, "\\n", 2); break;
481 case '\t': write(fd, "\\t", 2); break;
482 case '"': case '\\': write(fd, "\\", 1);
483 default: write(fd, value+i, 1);
484 }
485 write(fd, "\n", 1);
486}
487static int find_beginning_of_line(const char* contents, int size,
489 int offset_, int* found_bracket)
490{
491 int equal_offset = size, bracket_offset = size;
492 int offset;
493 for (offset = offset_-2; offset > 0
495 && contents[offset] != '\n'; offset--)
496 switch (contents[offset]) {
497 case '=': equal_offset = offset; break;
498 case ']': bracket_offset = offset; break;
499 }
500 if (bracket_offset < equal_offset) {
501 *found_bracket = 1;
502 offset = bracket_offset+1;
503 } else
504 offset++;
505 return offset;
507}
508int git_config_set(const char* key, const char* value)
510{
511 return git_config_set_multivar(key, value, NULL, 0);
512}
513/*
515 * If value==NULL, unset in (remove from) config,
516 * if value_regex!=NULL, disregard key/value pairs where value does not match.
517 * if multi_replace==0, nothing, or only one matching key/value is replaced,
518 * else all matching key/values (regardless how many) are removed,
519 * before the new pair is written.
520 *
521 * Returns 0 on success.
522 *
523 * This function does this:
524 *
525 * - it locks the config file by creating ".git/config.lock"
526 *
527 * - it then parses the config using store_aux() as validator to find
528 * the position on the key/value pair to replace. If it is to be unset,
529 * it must be found exactly once.
530 *
531 * - the config file is mmap()ed and the part before the match (if any) is
532 * written to the lock file, then the changed part and the rest.
533 *
534 * - the config file is removed and the lock file rename()d to it.
535 *
536 */
537int git_config_set_multivar(const char* key, const char* value,
538 const char* value_regex, int multi_replace)
539{
540 int i, dot;
541 int fd = -1, in_fd;
542 int ret;
543 char* config_filename;
544 char* lock_file;
545 const char* last_dot = strrchr(key, '.');
546 config_filename = getenv("GIT_CONFIG");
548 if (!config_filename) {
549 config_filename = getenv("GIT_CONFIG_LOCAL");
550 if (!config_filename)
551 config_filename = git_path("config");
552 }
553 config_filename = xstrdup(config_filename);
554 lock_file = xstrdup(mkpath("%s.lock", config_filename));
555 /*
557 * Since "key" actually contains the section name and the real
558 * key name separated by a dot, we have to know where the dot is.
559 */
560 if (last_dot == NULL) {
562 fprintf(stderr, "key does not contain a section: %s\n", key);
563 ret = 2;
564 goto out_free;
565 }
566 store.baselen = last_dot - key;
567 store.multi_replace = multi_replace;
569 /*
571 * Validate the key and while at it, lower case it for matching.
572 */
573 store.key = xmalloc(strlen(key) + 1);
574 dot = 0;
575 for (i = 0; key[i]; i++) {
576 unsigned char c = key[i];
577 if (c == '.')
578 dot = 1;
579 /* Leave the extended basename untouched.. */
580 if (!dot || i > store.baselen) {
581 if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
582 fprintf(stderr, "invalid key: %s\n", key);
583 free(store.key);
584 ret = 1;
585 goto out_free;
586 }
587 c = tolower(c);
588 }
589 store.key[i] = c;
590 }
591 store.key[i] = 0;
592 /*
594 * The lock_file serves a purpose in addition to locking: the new
595 * contents of .git/config will be written into it.
596 */
597 fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
598 if (fd < 0 || adjust_shared_perm(lock_file)) {
599 fprintf(stderr, "could not lock config file\n");
600 free(store.key);
601 ret = -1;
602 goto out_free;
603 }
604 /*
606 * If .git/config does not exist yet, write a minimal version.
607 */
608 in_fd = open(config_filename, O_RDONLY);
609 if ( in_fd < 0 ) {
610 free(store.key);
611 if ( ENOENT != errno ) {
613 error("opening %s: %s", config_filename,
614 strerror(errno));
615 ret = 3; /* same as "invalid config file" */
616 goto out_free;
617 }
618 /* if nothing to unset, error out */
619 if (value == NULL) {
620 ret = 5;
621 goto out_free;
622 }
623 store.key = (char*)key;
625 store_write_section(fd, key);
626 store_write_pair(fd, key, value);
627 } else{
628 struct stat st;
629 char* contents;
630 int i, copy_begin, copy_end, new_line = 0;
631 if (value_regex == NULL)
633 store.value_regex = NULL;
634 else {
635 if (value_regex[0] == '!') {
636 store.do_not_match = 1;
637 value_regex++;
638 } else
639 store.do_not_match = 0;
640 store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
642 if (regcomp(store.value_regex, value_regex,
643 REG_EXTENDED)) {
644 fprintf(stderr, "Invalid pattern: %s\n",
645 value_regex);
646 free(store.value_regex);
647 ret = 6;
648 goto out_free;
649 }
650 }
651 store.offset[0] = 0;
653 store.state = START;
654 store.seen = 0;
655 /*
657 * After this, store.offset will contain the *end* offset
658 * of the last match, or remain at 0 if no match was found.
659 * As a side effect, we make sure to transform only a valid
660 * existing config file.
661 */
662 if (git_config_from_file(store_aux, config_filename)) {
663 fprintf(stderr, "invalid config file\n");
664 free(store.key);
665 if (store.value_regex != NULL) {
666 regfree(store.value_regex);
667 free(store.value_regex);
668 }
669 ret = 3;
670 goto out_free;
671 }
672 free(store.key);
674 if (store.value_regex != NULL) {
675 regfree(store.value_regex);
676 free(store.value_regex);
677 }
678 /* if nothing to unset, or too many matches, error out */
680 if ((store.seen == 0 && value == NULL) ||
681 (store.seen > 1 && multi_replace == 0)) {
682 ret = 5;
683 goto out_free;
684 }
685 fstat(in_fd, &st);
687 contents = mmap(NULL, st.st_size, PROT_READ,
688 MAP_PRIVATE, in_fd, 0);
689 close(in_fd);
690 if (store.seen == 0)
692 store.seen = 1;
693 for (i = 0, copy_begin = 0; i < store.seen; i++) {
695 if (store.offset[i] == 0) {
696 store.offset[i] = copy_end = st.st_size;
697 } else if (store.state != KEY_SEEN) {
698 copy_end = store.offset[i];
699 } else
700 copy_end = find_beginning_of_line(
701 contents, st.st_size,
702 store.offset[i]-2, &new_line);
703 /* write the first part of the config */
705 if (copy_end > copy_begin) {
706 write(fd, contents + copy_begin,
707 copy_end - copy_begin);
708 if (new_line)
709 write(fd, "\n", 1);
710 }
711 copy_begin = store.offset[i];
712 }
713 /* write the pair (value == NULL means unset) */
715 if (value != NULL) {
716 if (store.state == START)
717 store_write_section(fd, key);
718 store_write_pair(fd, key, value);
719 }
720 /* write the rest of the config */
722 if (copy_begin < st.st_size)
723 write(fd, contents + copy_begin,
724 st.st_size - copy_begin);
725 munmap(contents, st.st_size);
727 unlink(config_filename);
728 }
729 if (rename(lock_file, config_filename) < 0) {
731 fprintf(stderr, "Could not rename the lock file?\n");
732 ret = 4;
733 goto out_free;
734 }
735 ret = 0;
737out_free:
739 if (0 <= fd)
740 close(fd);
741 free(config_filename);
742 if (lock_file) {
743 unlink(lock_file);
744 free(lock_file);
745 }
746 return ret;
747}
748