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 int get_value(config_fn_t fn, char *name, unsigned int len)
107{
108 int c;
109 char *value;
110 /* Get the full name */
112 for (;;) {
113 c = get_next_char();
114 if (c == EOF)
115 break;
116 if (!isalnum(c))
117 break;
118 name[len++] = tolower(c);
119 if (len >= MAXNAME)
120 return -1;
121 }
122 name[len] = 0;
123 while (c == ' ' || c == '\t')
124 c = get_next_char();
125 value = NULL;
127 if (c != '\n') {
128 if (c != '=')
129 return -1;
130 value = parse_value();
131 if (!value)
132 return -1;
133 }
134 return fn(name, value);
135}
136static int get_extended_base_var(char *name, int baselen, int c)
138{
139 do {
140 if (c == '\n')
141 return -1;
142 c = get_next_char();
143 } while (isspace(c));
144 /* We require the format to be '[base "extension"]' */
146 if (c != '"')
147 return -1;
148 name[baselen++] = '.';
149 for (;;) {
151 int c = get_next_char();
152 if (c == '\n')
153 return -1;
154 if (c == '"')
155 break;
156 if (c == '\\') {
157 c = get_next_char();
158 if (c == '\n')
159 return -1;
160 }
161 name[baselen++] = c;
162 if (baselen > MAXNAME / 2)
163 return -1;
164 }
165 /* Final ']' */
167 if (get_next_char() != ']')
168 return -1;
169 return baselen;
170}
171static int get_base_var(char *name)
173{
174 int baselen = 0;
175 for (;;) {
177 int c = get_next_char();
178 if (c == EOF)
179 return -1;
180 if (c == ']')
181 return baselen;
182 if (isspace(c))
183 return get_extended_base_var(name, baselen, c);
184 if (!isalnum(c) && c != '.')
185 return -1;
186 if (baselen > MAXNAME / 2)
187 return -1;
188 name[baselen++] = tolower(c);
189 }
190}
191static int git_parse_file(config_fn_t fn)
193{
194 int comment = 0;
195 int baselen = 0;
196 static char var[MAXNAME];
197 for (;;) {
199 int c = get_next_char();
200 if (c == '\n') {
201 /* EOF? */
202 if (!config_file)
203 return 0;
204 comment = 0;
205 continue;
206 }
207 if (comment || isspace(c))
208 continue;
209 if (c == '#' || c == ';') {
210 comment = 1;
211 continue;
212 }
213 if (c == '[') {
214 baselen = get_base_var(var);
215 if (baselen <= 0)
216 break;
217 var[baselen++] = '.';
218 var[baselen] = 0;
219 continue;
220 }
221 if (!isalpha(c))
222 break;
223 var[baselen] = tolower(c);
224 if (get_value(fn, var, baselen+1) < 0)
225 break;
226 }
227 die("bad config file line %d in %s", config_linenr, config_file_name);
228}
229int git_config_int(const char *name, const char *value)
231{
232 if (value && *value) {
233 char *end;
234 int val = strtol(value, &end, 0);
235 if (!*end)
236 return val;
237 }
238 die("bad config value for '%s' in %s", name, config_file_name);
239}
240int git_config_bool(const char *name, const char *value)
242{
243 if (!value)
244 return 1;
245 if (!*value)
246 return 0;
247 if (!strcasecmp(value, "true"))
248 return 1;
249 if (!strcasecmp(value, "false"))
250 return 0;
251 return git_config_int(name, value) != 0;
252}
253int git_default_config(const char *var, const char *value)
255{
256 /* This needs a better name */
257 if (!strcmp(var, "core.filemode")) {
258 trust_executable_bit = git_config_bool(var, value);
259 return 0;
260 }
261 if (!strcmp(var, "core.ignorestat")) {
263 assume_unchanged = git_config_bool(var, value);
264 return 0;
265 }
266 if (!strcmp(var, "core.prefersymlinkrefs")) {
268 prefer_symlink_refs = git_config_bool(var, value);
269 return 0;
270 }
271 if (!strcmp(var, "core.logallrefupdates")) {
273 log_all_ref_updates = git_config_bool(var, value);
274 return 0;
275 }
276 if (!strcmp(var, "core.warnambiguousrefs")) {
278 warn_ambiguous_refs = git_config_bool(var, value);
279 return 0;
280 }
281 if (!strcmp(var, "user.name")) {
283 strlcpy(git_default_name, value, sizeof(git_default_name));
284 return 0;
285 }
286 if (!strcmp(var, "user.email")) {
288 strlcpy(git_default_email, value, sizeof(git_default_email));
289 return 0;
290 }
291 if (!strcmp(var, "i18n.commitencoding")) {
293 strlcpy(git_commit_encoding, value, sizeof(git_commit_encoding));
294 return 0;
295 }
296 /* Add other config variables here and to Documentation/config.txt. */
298 return 0;
299}
300int git_config_from_file(config_fn_t fn, const char *filename)
302{
303 int ret;
304 FILE *f = fopen(filename, "r");
305 ret = -1;
307 if (f) {
308 config_file = f;
309 config_file_name = filename;
310 config_linenr = 1;
311 ret = git_parse_file(fn);
312 fclose(f);
313 config_file_name = NULL;
314 }
315 return ret;
316}
317int git_config(config_fn_t fn)
319{
320 int ret = 0;
321 char *repo_config = NULL;
322 const char *home = NULL, *filename;
323 /* $GIT_CONFIG makes git read _only_ the given config file,
325 * $GIT_CONFIG_LOCAL will make it process it in addition to the
326 * global config file, the same way it would the per-repository
327 * config file otherwise. */
328 filename = getenv("GIT_CONFIG");
329 if (!filename) {
330 home = getenv("HOME");
331 filename = getenv("GIT_CONFIG_LOCAL");
332 if (!filename)
333 filename = repo_config = strdup(git_path("config"));
334 }
335 if (home) {
337 char *user_config = strdup(mkpath("%s/.gitconfig", home));
338 if (!access(user_config, R_OK))
339 ret = git_config_from_file(fn, user_config);
340 free(user_config);
341 }
342 ret += git_config_from_file(fn, filename);
344 if (repo_config)
345 free(repo_config);
346 return ret;
347}
348/*
350 * Find all the stuff for git_config_set() below.
351 */
352#define MAX_MATCHES 512
354static struct {
356 int baselen;
357 char* key;
358 int do_not_match;
359 regex_t* value_regex;
360 int multi_replace;
361 off_t offset[MAX_MATCHES];
362 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
363 int seen;
364} store;
365static int matches(const char* key, const char* value)
367{
368 return !strcmp(key, store.key) &&
369 (store.value_regex == NULL ||
370 (store.do_not_match ^
371 !regexec(store.value_regex, value, 0, NULL, 0)));
372}
373static int store_aux(const char* key, const char* value)
375{
376 switch (store.state) {
377 case KEY_SEEN:
378 if (matches(key, value)) {
379 if (store.seen == 1 && store.multi_replace == 0) {
380 fprintf(stderr,
381 "Warning: %s has multiple values\n",
382 key);
383 } else if (store.seen >= MAX_MATCHES) {
384 fprintf(stderr, "Too many matches\n");
385 return 1;
386 }
387 store.offset[store.seen] = ftell(config_file);
389 store.seen++;
390 }
391 break;
392 case SECTION_SEEN:
393 if (strncmp(key, store.key, store.baselen+1)) {
394 store.state = SECTION_END_SEEN;
395 break;
396 } else
397 /* do not increment matches: this is no match */
398 store.offset[store.seen] = ftell(config_file);
399 /* fallthru */
400 case SECTION_END_SEEN:
401 case START:
402 if (matches(key, value)) {
403 store.offset[store.seen] = ftell(config_file);
404 store.state = KEY_SEEN;
405 store.seen++;
406 } else {
407 if (strrchr(key, '.') - key == store.baselen &&
408 !strncmp(key, store.key, store.baselen)) {
409 store.state = SECTION_SEEN;
410 store.offset[store.seen] = ftell(config_file);
411 }
412 }
413 }
414 return 0;
415}
416static void store_write_section(int fd, const char* key)
418{
419 const char *dot = strchr(key, '.');
420 int len1 = store.baselen, len2 = -1;
421 dot = strchr(key, '.');
423 if (dot) {
424 int dotlen = dot - key;
425 if (dotlen < len1) {
426 len2 = len1 - dotlen - 1;
427 len1 = dotlen;
428 }
429 }
430 write(fd, "[", 1);
432 write(fd, key, len1);
433 if (len2 >= 0) {
434 write(fd, " \"", 2);
435 while (--len2 >= 0) {
436 unsigned char c = *++dot;
437 if (c == '"')
438 write(fd, "\\", 1);
439 write(fd, &c, 1);
440 }
441 write(fd, "\"", 1);
442 }
443 write(fd, "]\n", 2);
444}
445static void store_write_pair(int fd, const char* key, const char* value)
447{
448 int i;
449 write(fd, "\t", 1);
451 write(fd, key+store.baselen+1,
452 strlen(key+store.baselen+1));
453 write(fd, " = ", 3);
454 for (i = 0; value[i]; i++)
455 switch (value[i]) {
456 case '\n': write(fd, "\\n", 2); break;
457 case '\t': write(fd, "\\t", 2); break;
458 case '"': case '\\': write(fd, "\\", 1);
459 default: write(fd, value+i, 1);
460 }
461 write(fd, "\n", 1);
462}
463static int find_beginning_of_line(const char* contents, int size,
465 int offset_, int* found_bracket)
466{
467 int equal_offset = size, bracket_offset = size;
468 int offset;
469 for (offset = offset_-2; offset > 0
471 && contents[offset] != '\n'; offset--)
472 switch (contents[offset]) {
473 case '=': equal_offset = offset; break;
474 case ']': bracket_offset = offset; break;
475 }
476 if (bracket_offset < equal_offset) {
477 *found_bracket = 1;
478 offset = bracket_offset+1;
479 } else
480 offset++;
481 return offset;
483}
484int git_config_set(const char* key, const char* value)
486{
487 return git_config_set_multivar(key, value, NULL, 0);
488}
489/*
491 * If value==NULL, unset in (remove from) config,
492 * if value_regex!=NULL, disregard key/value pairs where value does not match.
493 * if multi_replace==0, nothing, or only one matching key/value is replaced,
494 * else all matching key/values (regardless how many) are removed,
495 * before the new pair is written.
496 *
497 * Returns 0 on success.
498 *
499 * This function does this:
500 *
501 * - it locks the config file by creating ".git/config.lock"
502 *
503 * - it then parses the config using store_aux() as validator to find
504 * the position on the key/value pair to replace. If it is to be unset,
505 * it must be found exactly once.
506 *
507 * - the config file is mmap()ed and the part before the match (if any) is
508 * written to the lock file, then the changed part and the rest.
509 *
510 * - the config file is removed and the lock file rename()d to it.
511 *
512 */
513int git_config_set_multivar(const char* key, const char* value,
514 const char* value_regex, int multi_replace)
515{
516 int i, dot;
517 int fd = -1, in_fd;
518 int ret;
519 char* config_filename;
520 char* lock_file;
521 const char* last_dot = strrchr(key, '.');
522 config_filename = getenv("GIT_CONFIG");
524 if (!config_filename) {
525 config_filename = getenv("GIT_CONFIG_LOCAL");
526 if (!config_filename)
527 config_filename = git_path("config");
528 }
529 config_filename = strdup(config_filename);
530 lock_file = strdup(mkpath("%s.lock", config_filename));
531 /*
533 * Since "key" actually contains the section name and the real
534 * key name separated by a dot, we have to know where the dot is.
535 */
536 if (last_dot == NULL) {
538 fprintf(stderr, "key does not contain a section: %s\n", key);
539 ret = 2;
540 goto out_free;
541 }
542 store.baselen = last_dot - key;
543 store.multi_replace = multi_replace;
545 /*
547 * Validate the key and while at it, lower case it for matching.
548 */
549 store.key = (char*)malloc(strlen(key)+1);
550 dot = 0;
551 for (i = 0; key[i]; i++) {
552 unsigned char c = key[i];
553 if (c == '.')
554 dot = 1;
555 /* Leave the extended basename untouched.. */
556 if (!dot || i > store.baselen) {
557 if (!isalnum(c) || (i == store.baselen+1 && !isalpha(c))) {
558 fprintf(stderr, "invalid key: %s\n", key);
559 free(store.key);
560 ret = 1;
561 goto out_free;
562 }
563 c = tolower(c);
564 }
565 store.key[i] = c;
566 }
567 store.key[i] = 0;
568 /*
570 * The lock_file serves a purpose in addition to locking: the new
571 * contents of .git/config will be written into it.
572 */
573 fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
574 if (fd < 0 || adjust_shared_perm(lock_file)) {
575 fprintf(stderr, "could not lock config file\n");
576 free(store.key);
577 ret = -1;
578 goto out_free;
579 }
580 /*
582 * If .git/config does not exist yet, write a minimal version.
583 */
584 in_fd = open(config_filename, O_RDONLY);
585 if ( in_fd < 0 ) {
586 free(store.key);
587 if ( ENOENT != errno ) {
589 error("opening %s: %s", config_filename,
590 strerror(errno));
591 ret = 3; /* same as "invalid config file" */
592 goto out_free;
593 }
594 /* if nothing to unset, error out */
595 if (value == NULL) {
596 ret = 5;
597 goto out_free;
598 }
599 store.key = (char*)key;
601 store_write_section(fd, key);
602 store_write_pair(fd, key, value);
603 } else{
604 struct stat st;
605 char* contents;
606 int i, copy_begin, copy_end, new_line = 0;
607 if (value_regex == NULL)
609 store.value_regex = NULL;
610 else {
611 if (value_regex[0] == '!') {
612 store.do_not_match = 1;
613 value_regex++;
614 } else
615 store.do_not_match = 0;
616 store.value_regex = (regex_t*)malloc(sizeof(regex_t));
618 if (regcomp(store.value_regex, value_regex,
619 REG_EXTENDED)) {
620 fprintf(stderr, "Invalid pattern: %s\n",
621 value_regex);
622 free(store.value_regex);
623 ret = 6;
624 goto out_free;
625 }
626 }
627 store.offset[0] = 0;
629 store.state = START;
630 store.seen = 0;
631 /*
633 * After this, store.offset will contain the *end* offset
634 * of the last match, or remain at 0 if no match was found.
635 * As a side effect, we make sure to transform only a valid
636 * existing config file.
637 */
638 if (git_config_from_file(store_aux, config_filename)) {
639 fprintf(stderr, "invalid config file\n");
640 free(store.key);
641 if (store.value_regex != NULL) {
642 regfree(store.value_regex);
643 free(store.value_regex);
644 }
645 ret = 3;
646 goto out_free;
647 }
648 free(store.key);
650 if (store.value_regex != NULL) {
651 regfree(store.value_regex);
652 free(store.value_regex);
653 }
654 /* if nothing to unset, or too many matches, error out */
656 if ((store.seen == 0 && value == NULL) ||
657 (store.seen > 1 && multi_replace == 0)) {
658 ret = 5;
659 goto out_free;
660 }
661 fstat(in_fd, &st);
663 contents = mmap(NULL, st.st_size, PROT_READ,
664 MAP_PRIVATE, in_fd, 0);
665 close(in_fd);
666 if (store.seen == 0)
668 store.seen = 1;
669 for (i = 0, copy_begin = 0; i < store.seen; i++) {
671 if (store.offset[i] == 0) {
672 store.offset[i] = copy_end = st.st_size;
673 } else if (store.state != KEY_SEEN) {
674 copy_end = store.offset[i];
675 } else
676 copy_end = find_beginning_of_line(
677 contents, st.st_size,
678 store.offset[i]-2, &new_line);
679 /* write the first part of the config */
681 if (copy_end > copy_begin) {
682 write(fd, contents + copy_begin,
683 copy_end - copy_begin);
684 if (new_line)
685 write(fd, "\n", 1);
686 }
687 copy_begin = store.offset[i];
688 }
689 /* write the pair (value == NULL means unset) */
691 if (value != NULL) {
692 if (store.state == START)
693 store_write_section(fd, key);
694 store_write_pair(fd, key, value);
695 }
696 /* write the rest of the config */
698 if (copy_begin < st.st_size)
699 write(fd, contents + copy_begin,
700 st.st_size - copy_begin);
701 munmap(contents, st.st_size);
703 unlink(config_filename);
704 }
705 if (rename(lock_file, config_filename) < 0) {
707 fprintf(stderr, "Could not rename the lock file?\n");
708 ret = 4;
709 goto out_free;
710 }
711 ret = 0;
713out_free:
715 if (0 <= fd)
716 close(fd);
717 if (config_filename)
718 free(config_filename);
719 if (lock_file) {
720 unlink(lock_file);
721 free(lock_file);
722 }
723 return ret;
724}
725