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") || !strcasecmp(value, "yes"))
248 return 1;
249 if (!strcasecmp(value, "false") || !strcasecmp(value, "no"))
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, "core.legacyheaders")) {
283 use_legacy_headers = git_config_bool(var, value);
284 return 0;
285 }
286 if (!strcmp(var, "core.compression")) {
288 int level = git_config_int(var, value);
289 if (level == -1)
290 level = Z_DEFAULT_COMPRESSION;
291 else if (level < 0 || level > Z_BEST_COMPRESSION)
292 die("bad zlib compression level %d", level);
293 zlib_compression_level = level;
294 return 0;
295 }
296 if (!strcmp(var, "user.name")) {
298 strlcpy(git_default_name, value, sizeof(git_default_name));
299 return 0;
300 }
301 if (!strcmp(var, "user.email")) {
303 strlcpy(git_default_email, value, sizeof(git_default_email));
304 return 0;
305 }
306 if (!strcmp(var, "i18n.commitencoding")) {
308 strlcpy(git_commit_encoding, value, sizeof(git_commit_encoding));
309 return 0;
310 }
311 /* Add other config variables here and to Documentation/config.txt. */
313 return 0;
314}
315int git_config_from_file(config_fn_t fn, const char *filename)
317{
318 int ret;
319 FILE *f = fopen(filename, "r");
320 ret = -1;
322 if (f) {
323 config_file = f;
324 config_file_name = filename;
325 config_linenr = 1;
326 ret = git_parse_file(fn);
327 fclose(f);
328 config_file_name = NULL;
329 }
330 return ret;
331}
332int git_config(config_fn_t fn)
334{
335 int ret = 0;
336 char *repo_config = NULL;
337 const char *home = NULL, *filename;
338 /* $GIT_CONFIG makes git read _only_ the given config file,
340 * $GIT_CONFIG_LOCAL will make it process it in addition to the
341 * global config file, the same way it would the per-repository
342 * config file otherwise. */
343 filename = getenv("GIT_CONFIG");
344 if (!filename) {
345 home = getenv("HOME");
346 filename = getenv("GIT_CONFIG_LOCAL");
347 if (!filename)
348 filename = repo_config = strdup(git_path("config"));
349 }
350 if (home) {
352 char *user_config = strdup(mkpath("%s/.gitconfig", home));
353 if (!access(user_config, R_OK))
354 ret = git_config_from_file(fn, user_config);
355 free(user_config);
356 }
357 ret += git_config_from_file(fn, filename);
359 if (repo_config)
360 free(repo_config);
361 return ret;
362}
363/*
365 * Find all the stuff for git_config_set() below.
366 */
367#define MAX_MATCHES 512
369static struct {
371 int baselen;
372 char* key;
373 int do_not_match;
374 regex_t* value_regex;
375 int multi_replace;
376 off_t offset[MAX_MATCHES];
377 enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
378 int seen;
379} store;
380static int matches(const char* key, const char* value)
382{
383 return !strcmp(key, store.key) &&
384 (store.value_regex == NULL ||
385 (store.do_not_match ^
386 !regexec(store.value_regex, value, 0, NULL, 0)));
387}
388static int store_aux(const char* key, const char* value)
390{
391 switch (store.state) {
392 case KEY_SEEN:
393 if (matches(key, value)) {
394 if (store.seen == 1 && store.multi_replace == 0) {
395 fprintf(stderr,
396 "Warning: %s has multiple values\n",
397 key);
398 } else if (store.seen >= MAX_MATCHES) {
399 fprintf(stderr, "Too many matches\n");
400 return 1;
401 }
402 store.offset[store.seen] = ftell(config_file);
404 store.seen++;
405 }
406 break;
407 case SECTION_SEEN:
408 if (strncmp(key, store.key, store.baselen+1)) {
409 store.state = SECTION_END_SEEN;
410 break;
411 } else
412 /* do not increment matches: this is no match */
413 store.offset[store.seen] = ftell(config_file);
414 /* fallthru */
415 case SECTION_END_SEEN:
416 case START:
417 if (matches(key, value)) {
418 store.offset[store.seen] = ftell(config_file);
419 store.state = KEY_SEEN;
420 store.seen++;
421 } else {
422 if (strrchr(key, '.') - key == store.baselen &&
423 !strncmp(key, store.key, store.baselen)) {
424 store.state = SECTION_SEEN;
425 store.offset[store.seen] = ftell(config_file);
426 }
427 }
428 }
429 return 0;
430}
431static void store_write_section(int fd, const char* key)
433{
434 const char *dot = strchr(key, '.');
435 int len1 = store.baselen, len2 = -1;
436 dot = strchr(key, '.');
438 if (dot) {
439 int dotlen = dot - key;
440 if (dotlen < len1) {
441 len2 = len1 - dotlen - 1;
442 len1 = dotlen;
443 }
444 }
445 write(fd, "[", 1);
447 write(fd, key, len1);
448 if (len2 >= 0) {
449 write(fd, " \"", 2);
450 while (--len2 >= 0) {
451 unsigned char c = *++dot;
452 if (c == '"')
453 write(fd, "\\", 1);
454 write(fd, &c, 1);
455 }
456 write(fd, "\"", 1);
457 }
458 write(fd, "]\n", 2);
459}
460static void store_write_pair(int fd, const char* key, const char* value)
462{
463 int i;
464 write(fd, "\t", 1);
466 write(fd, key+store.baselen+1,
467 strlen(key+store.baselen+1));
468 write(fd, " = ", 3);
469 for (i = 0; value[i]; i++)
470 switch (value[i]) {
471 case '\n': write(fd, "\\n", 2); break;
472 case '\t': write(fd, "\\t", 2); break;
473 case '"': case '\\': write(fd, "\\", 1);
474 default: write(fd, value+i, 1);
475 }
476 write(fd, "\n", 1);
477}
478static int find_beginning_of_line(const char* contents, int size,
480 int offset_, int* found_bracket)
481{
482 int equal_offset = size, bracket_offset = size;
483 int offset;
484 for (offset = offset_-2; offset > 0
486 && contents[offset] != '\n'; offset--)
487 switch (contents[offset]) {
488 case '=': equal_offset = offset; break;
489 case ']': bracket_offset = offset; break;
490 }
491 if (bracket_offset < equal_offset) {
492 *found_bracket = 1;
493 offset = bracket_offset+1;
494 } else
495 offset++;
496 return offset;
498}
499int git_config_set(const char* key, const char* value)
501{
502 return git_config_set_multivar(key, value, NULL, 0);
503}
504/*
506 * If value==NULL, unset in (remove from) config,
507 * if value_regex!=NULL, disregard key/value pairs where value does not match.
508 * if multi_replace==0, nothing, or only one matching key/value is replaced,
509 * else all matching key/values (regardless how many) are removed,
510 * before the new pair is written.
511 *
512 * Returns 0 on success.
513 *
514 * This function does this:
515 *
516 * - it locks the config file by creating ".git/config.lock"
517 *
518 * - it then parses the config using store_aux() as validator to find
519 * the position on the key/value pair to replace. If it is to be unset,
520 * it must be found exactly once.
521 *
522 * - the config file is mmap()ed and the part before the match (if any) is
523 * written to the lock file, then the changed part and the rest.
524 *
525 * - the config file is removed and the lock file rename()d to it.
526 *
527 */
528int git_config_set_multivar(const char* key, const char* value,
529 const char* value_regex, int multi_replace)
530{
531 int i, dot;
532 int fd = -1, in_fd;
533 int ret;
534 char* config_filename;
535 char* lock_file;
536 const char* last_dot = strrchr(key, '.');
537 config_filename = getenv("GIT_CONFIG");
539 if (!config_filename) {
540 config_filename = getenv("GIT_CONFIG_LOCAL");
541 if (!config_filename)
542 config_filename = git_path("config");
543 }
544 config_filename = strdup(config_filename);
545 lock_file = strdup(mkpath("%s.lock", config_filename));
546 /*
548 * Since "key" actually contains the section name and the real
549 * key name separated by a dot, we have to know where the dot is.
550 */
551 if (last_dot == NULL) {
553 fprintf(stderr, "key does not contain a section: %s\n", key);
554 ret = 2;
555 goto out_free;
556 }
557 store.baselen = last_dot - key;
558 store.multi_replace = multi_replace;
560 /*
562 * Validate the key and while at it, lower case it for matching.
563 */
564 store.key = (char*)malloc(strlen(key)+1);
565 dot = 0;
566 for (i = 0; key[i]; i++) {
567 unsigned char c = key[i];
568 if (c == '.')
569 dot = 1;
570 /* Leave the extended basename untouched.. */
571 if (!dot || i > store.baselen) {
572 if (!isalnum(c) || (i == store.baselen+1 && !isalpha(c))) {
573 fprintf(stderr, "invalid key: %s\n", key);
574 free(store.key);
575 ret = 1;
576 goto out_free;
577 }
578 c = tolower(c);
579 }
580 store.key[i] = c;
581 }
582 store.key[i] = 0;
583 /*
585 * The lock_file serves a purpose in addition to locking: the new
586 * contents of .git/config will be written into it.
587 */
588 fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
589 if (fd < 0 || adjust_shared_perm(lock_file)) {
590 fprintf(stderr, "could not lock config file\n");
591 free(store.key);
592 ret = -1;
593 goto out_free;
594 }
595 /*
597 * If .git/config does not exist yet, write a minimal version.
598 */
599 in_fd = open(config_filename, O_RDONLY);
600 if ( in_fd < 0 ) {
601 free(store.key);
602 if ( ENOENT != errno ) {
604 error("opening %s: %s", config_filename,
605 strerror(errno));
606 ret = 3; /* same as "invalid config file" */
607 goto out_free;
608 }
609 /* if nothing to unset, error out */
610 if (value == NULL) {
611 ret = 5;
612 goto out_free;
613 }
614 store.key = (char*)key;
616 store_write_section(fd, key);
617 store_write_pair(fd, key, value);
618 } else{
619 struct stat st;
620 char* contents;
621 int i, copy_begin, copy_end, new_line = 0;
622 if (value_regex == NULL)
624 store.value_regex = NULL;
625 else {
626 if (value_regex[0] == '!') {
627 store.do_not_match = 1;
628 value_regex++;
629 } else
630 store.do_not_match = 0;
631 store.value_regex = (regex_t*)malloc(sizeof(regex_t));
633 if (regcomp(store.value_regex, value_regex,
634 REG_EXTENDED)) {
635 fprintf(stderr, "Invalid pattern: %s\n",
636 value_regex);
637 free(store.value_regex);
638 ret = 6;
639 goto out_free;
640 }
641 }
642 store.offset[0] = 0;
644 store.state = START;
645 store.seen = 0;
646 /*
648 * After this, store.offset will contain the *end* offset
649 * of the last match, or remain at 0 if no match was found.
650 * As a side effect, we make sure to transform only a valid
651 * existing config file.
652 */
653 if (git_config_from_file(store_aux, config_filename)) {
654 fprintf(stderr, "invalid config file\n");
655 free(store.key);
656 if (store.value_regex != NULL) {
657 regfree(store.value_regex);
658 free(store.value_regex);
659 }
660 ret = 3;
661 goto out_free;
662 }
663 free(store.key);
665 if (store.value_regex != NULL) {
666 regfree(store.value_regex);
667 free(store.value_regex);
668 }
669 /* if nothing to unset, or too many matches, error out */
671 if ((store.seen == 0 && value == NULL) ||
672 (store.seen > 1 && multi_replace == 0)) {
673 ret = 5;
674 goto out_free;
675 }
676 fstat(in_fd, &st);
678 contents = mmap(NULL, st.st_size, PROT_READ,
679 MAP_PRIVATE, in_fd, 0);
680 close(in_fd);
681 if (store.seen == 0)
683 store.seen = 1;
684 for (i = 0, copy_begin = 0; i < store.seen; i++) {
686 if (store.offset[i] == 0) {
687 store.offset[i] = copy_end = st.st_size;
688 } else if (store.state != KEY_SEEN) {
689 copy_end = store.offset[i];
690 } else
691 copy_end = find_beginning_of_line(
692 contents, st.st_size,
693 store.offset[i]-2, &new_line);
694 /* write the first part of the config */
696 if (copy_end > copy_begin) {
697 write(fd, contents + copy_begin,
698 copy_end - copy_begin);
699 if (new_line)
700 write(fd, "\n", 1);
701 }
702 copy_begin = store.offset[i];
703 }
704 /* write the pair (value == NULL means unset) */
706 if (value != NULL) {
707 if (store.state == START)
708 store_write_section(fd, key);
709 store_write_pair(fd, key, value);
710 }
711 /* write the rest of the config */
713 if (copy_begin < st.st_size)
714 write(fd, contents + copy_begin,
715 st.st_size - copy_begin);
716 munmap(contents, st.st_size);
718 unlink(config_filename);
719 }
720 if (rename(lock_file, config_filename) < 0) {
722 fprintf(stderr, "Could not rename the lock file?\n");
723 ret = 4;
724 goto out_free;
725 }
726 ret = 0;
728out_free:
730 if (0 <= fd)
731 close(fd);
732 if (config_filename)
733 free(config_filename);
734 if (lock_file) {
735 unlink(lock_file);
736 free(lock_file);
737 }
738 return ret;
739}
740