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Commit | Line | Data |
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10bea152 JS |
1 | /* |
2 | * GIT - The information manager from hell | |
3 | * | |
4 | * Copyright (C) Linus Torvalds, 2005 | |
5 | * Copyright (C) Johannes Schindelin, 2005 | |
6 | * | |
7 | */ | |
17712991 | 8 | #include "cache.h" |
10bea152 | 9 | #include <regex.h> |
17712991 LT |
10 | |
11 | #define MAXNAME (256) | |
12 | ||
13 | static FILE *config_file; | |
0dccc7dc | 14 | static const char *config_file_name; |
17712991 LT |
15 | static int config_linenr; |
16 | static int get_next_char(void) | |
17 | { | |
18 | int c; | |
19 | FILE *f; | |
20 | ||
21 | c = '\n'; | |
22 | if ((f = config_file) != NULL) { | |
23 | c = fgetc(f); | |
db2c075d JH |
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 | } | |
17712991 LT |
32 | if (c == '\n') |
33 | config_linenr++; | |
34 | if (c == EOF) { | |
35 | config_file = NULL; | |
36 | c = '\n'; | |
37 | } | |
38 | } | |
39 | return c; | |
40 | } | |
41 | ||
42 | static char *parse_value(void) | |
43 | { | |
44 | static char value[1024]; | |
45 | int quote = 0, comment = 0, len = 0, space = 0; | |
46 | ||
47 | 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 (space) { | |
64 | if (len) | |
65 | value[len++] = ' '; | |
66 | space = 0; | |
67 | } | |
68 | if (c == '\\') { | |
69 | c = get_next_char(); | |
70 | switch (c) { | |
71 | case '\n': | |
72 | continue; | |
73 | case 't': | |
74 | c = '\t'; | |
75 | break; | |
76 | case 'b': | |
77 | c = '\b'; | |
78 | break; | |
79 | case 'n': | |
80 | c = '\n'; | |
81 | break; | |
5cbb401d LT |
82 | /* Some characters escape as themselves */ |
83 | case '\\': case '"': | |
84 | break; | |
85 | /* Reject unknown escape sequences */ | |
86 | default: | |
87 | return NULL; | |
17712991 LT |
88 | } |
89 | value[len++] = c; | |
90 | continue; | |
91 | } | |
92 | if (c == '"') { | |
93 | quote = 1-quote; | |
94 | continue; | |
95 | } | |
96 | if (!quote) { | |
97 | if (c == ';' || c == '#') { | |
98 | comment = 1; | |
99 | continue; | |
100 | } | |
101 | } | |
102 | value[len++] = c; | |
103 | } | |
104 | } | |
105 | ||
106 | static int get_value(config_fn_t fn, char *name, unsigned int len) | |
107 | { | |
108 | int c; | |
109 | char *value; | |
110 | ||
111 | /* 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 | ||
126 | 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 | } | |
136 | ||
137 | static int get_base_var(char *name) | |
138 | { | |
139 | int baselen = 0; | |
140 | ||
141 | for (;;) { | |
142 | int c = get_next_char(); | |
143 | if (c == EOF) | |
144 | return -1; | |
145 | if (c == ']') | |
146 | return baselen; | |
b17e659d | 147 | if (!isalnum(c) && c != '.') |
17712991 LT |
148 | return -1; |
149 | if (baselen > MAXNAME / 2) | |
150 | return -1; | |
151 | name[baselen++] = tolower(c); | |
152 | } | |
153 | } | |
154 | ||
155 | static int git_parse_file(config_fn_t fn) | |
156 | { | |
157 | int comment = 0; | |
158 | int baselen = 0; | |
159 | static char var[MAXNAME]; | |
160 | ||
161 | for (;;) { | |
162 | int c = get_next_char(); | |
163 | if (c == '\n') { | |
164 | /* EOF? */ | |
165 | if (!config_file) | |
166 | return 0; | |
167 | comment = 0; | |
168 | continue; | |
169 | } | |
170 | if (comment || isspace(c)) | |
171 | continue; | |
172 | if (c == '#' || c == ';') { | |
173 | comment = 1; | |
174 | continue; | |
175 | } | |
176 | if (c == '[') { | |
177 | baselen = get_base_var(var); | |
178 | if (baselen <= 0) | |
179 | break; | |
180 | var[baselen++] = '.'; | |
181 | var[baselen] = 0; | |
182 | continue; | |
183 | } | |
184 | if (!isalpha(c)) | |
185 | break; | |
128af9d1 | 186 | var[baselen] = tolower(c); |
17712991 LT |
187 | if (get_value(fn, var, baselen+1) < 0) |
188 | break; | |
189 | } | |
4f629539 | 190 | die("bad config file line %d in %s", config_linenr, config_file_name); |
17712991 LT |
191 | } |
192 | ||
193 | int git_config_int(const char *name, const char *value) | |
194 | { | |
195 | if (value && *value) { | |
196 | char *end; | |
197 | int val = strtol(value, &end, 0); | |
198 | if (!*end) | |
199 | return val; | |
200 | } | |
4f629539 | 201 | die("bad config value for '%s' in %s", name, config_file_name); |
17712991 LT |
202 | } |
203 | ||
204 | int git_config_bool(const char *name, const char *value) | |
205 | { | |
206 | if (!value) | |
207 | return 1; | |
208 | if (!*value) | |
209 | return 0; | |
210 | if (!strcasecmp(value, "true")) | |
211 | return 1; | |
212 | if (!strcasecmp(value, "false")) | |
213 | return 0; | |
214 | return git_config_int(name, value) != 0; | |
215 | } | |
216 | ||
217 | int git_default_config(const char *var, const char *value) | |
218 | { | |
219 | /* This needs a better name */ | |
220 | if (!strcmp(var, "core.filemode")) { | |
221 | trust_executable_bit = git_config_bool(var, value); | |
222 | return 0; | |
223 | } | |
224 | ||
f8348be3 JS |
225 | if (!strcmp(var, "core.symrefsonly")) { |
226 | only_use_symrefs = git_config_bool(var, value); | |
227 | return 0; | |
228 | } | |
229 | ||
e1b10391 LT |
230 | if (!strcmp(var, "user.name")) { |
231 | strncpy(git_default_name, value, sizeof(git_default_name)); | |
232 | return 0; | |
233 | } | |
234 | ||
235 | if (!strcmp(var, "user.email")) { | |
236 | strncpy(git_default_email, value, sizeof(git_default_email)); | |
237 | return 0; | |
238 | } | |
239 | ||
4e72dcec JH |
240 | if (!strcmp(var, "i18n.commitencoding")) { |
241 | strncpy(git_commit_encoding, value, sizeof(git_commit_encoding)); | |
242 | return 0; | |
243 | } | |
244 | ||
17712991 LT |
245 | /* Add other config variables here.. */ |
246 | return 0; | |
247 | } | |
248 | ||
4f629539 | 249 | int git_config_from_file(config_fn_t fn, const char *filename) |
17712991 LT |
250 | { |
251 | int ret; | |
4f629539 | 252 | FILE *f = fopen(filename, "r"); |
17712991 LT |
253 | |
254 | ret = -1; | |
255 | if (f) { | |
256 | config_file = f; | |
4f629539 | 257 | config_file_name = filename; |
17712991 LT |
258 | config_linenr = 1; |
259 | ret = git_parse_file(fn); | |
260 | fclose(f); | |
4f629539 | 261 | config_file_name = NULL; |
17712991 LT |
262 | } |
263 | return ret; | |
264 | } | |
10bea152 | 265 | |
4f629539 JH |
266 | int git_config(config_fn_t fn) |
267 | { | |
268 | return git_config_from_file(fn, git_path("config")); | |
269 | } | |
270 | ||
10bea152 JS |
271 | /* |
272 | * Find all the stuff for git_config_set() below. | |
273 | */ | |
4ddba79d JS |
274 | |
275 | #define MAX_MATCHES 512 | |
276 | ||
10bea152 JS |
277 | static struct { |
278 | int baselen; | |
279 | char* key; | |
f98d863d | 280 | int do_not_match; |
10bea152 | 281 | regex_t* value_regex; |
4ddba79d JS |
282 | int multi_replace; |
283 | off_t offset[MAX_MATCHES]; | |
10bea152 JS |
284 | enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state; |
285 | int seen; | |
286 | } store; | |
287 | ||
f98d863d JS |
288 | static int matches(const char* key, const char* value) |
289 | { | |
290 | return !strcmp(key, store.key) && | |
291 | (store.value_regex == NULL || | |
292 | (store.do_not_match ^ | |
293 | !regexec(store.value_regex, value, 0, NULL, 0))); | |
294 | } | |
295 | ||
10bea152 JS |
296 | static int store_aux(const char* key, const char* value) |
297 | { | |
298 | switch (store.state) { | |
299 | case KEY_SEEN: | |
f98d863d | 300 | if (matches(key, value)) { |
4ddba79d | 301 | if (store.seen == 1 && store.multi_replace == 0) { |
10bea152 JS |
302 | fprintf(stderr, |
303 | "Warning: %s has multiple values\n", | |
304 | key); | |
4ddba79d JS |
305 | } else if (store.seen >= MAX_MATCHES) { |
306 | fprintf(stderr, "Too many matches\n"); | |
307 | return 1; | |
10bea152 | 308 | } |
4ddba79d JS |
309 | |
310 | store.offset[store.seen] = ftell(config_file); | |
10bea152 JS |
311 | store.seen++; |
312 | } | |
313 | break; | |
314 | case SECTION_SEEN: | |
315 | if (strncmp(key, store.key, store.baselen+1)) { | |
316 | store.state = SECTION_END_SEEN; | |
317 | break; | |
318 | } else | |
4ddba79d JS |
319 | /* do not increment matches: this is no match */ |
320 | store.offset[store.seen] = ftell(config_file); | |
10bea152 JS |
321 | /* fallthru */ |
322 | case SECTION_END_SEEN: | |
323 | case START: | |
f98d863d | 324 | if (matches(key, value)) { |
4ddba79d | 325 | store.offset[store.seen] = ftell(config_file); |
10bea152 JS |
326 | store.state = KEY_SEEN; |
327 | store.seen++; | |
328 | } else if(!strncmp(key, store.key, store.baselen)) | |
329 | store.state = SECTION_SEEN; | |
330 | } | |
331 | return 0; | |
332 | } | |
333 | ||
334 | static void store_write_section(int fd, const char* key) | |
335 | { | |
336 | write(fd, "[", 1); | |
337 | write(fd, key, store.baselen); | |
338 | write(fd, "]\n", 2); | |
339 | } | |
340 | ||
341 | static void store_write_pair(int fd, const char* key, const char* value) | |
342 | { | |
343 | int i; | |
344 | ||
345 | write(fd, "\t", 1); | |
346 | write(fd, key+store.baselen+1, | |
347 | strlen(key+store.baselen+1)); | |
348 | write(fd, " = ", 3); | |
349 | for (i = 0; value[i]; i++) | |
350 | switch (value[i]) { | |
351 | case '\n': write(fd, "\\n", 2); break; | |
352 | case '\t': write(fd, "\\t", 2); break; | |
353 | case '"': case '\\': write(fd, "\\", 1); | |
354 | default: write(fd, value+i, 1); | |
355 | } | |
356 | write(fd, "\n", 1); | |
357 | } | |
358 | ||
4ddba79d JS |
359 | static int find_beginning_of_line(const char* contents, int size, |
360 | int offset_, int* found_bracket) | |
361 | { | |
362 | int equal_offset = size, bracket_offset = size; | |
363 | int offset; | |
364 | ||
365 | for (offset = offset_-2; offset > 0 | |
366 | && contents[offset] != '\n'; offset--) | |
367 | switch (contents[offset]) { | |
368 | case '=': equal_offset = offset; break; | |
369 | case ']': bracket_offset = offset; break; | |
370 | } | |
371 | if (bracket_offset < equal_offset) { | |
372 | *found_bracket = 1; | |
373 | offset = bracket_offset+1; | |
374 | } else | |
375 | offset++; | |
376 | ||
377 | return offset; | |
378 | } | |
379 | ||
10bea152 JS |
380 | int git_config_set(const char* key, const char* value) |
381 | { | |
4ddba79d | 382 | return git_config_set_multivar(key, value, NULL, 0); |
10bea152 JS |
383 | } |
384 | ||
385 | /* | |
386 | * If value==NULL, unset in (remove from) config, | |
387 | * if value_regex!=NULL, disregard key/value pairs where value does not match. | |
4ddba79d JS |
388 | * if multi_replace==0, nothing, or only one matching key/value is replaced, |
389 | * else all matching key/values (regardless how many) are removed, | |
390 | * before the new pair is written. | |
10bea152 JS |
391 | * |
392 | * Returns 0 on success. | |
393 | * | |
394 | * This function does this: | |
395 | * | |
396 | * - it locks the config file by creating ".git/config.lock" | |
397 | * | |
398 | * - it then parses the config using store_aux() as validator to find | |
399 | * the position on the key/value pair to replace. If it is to be unset, | |
400 | * it must be found exactly once. | |
401 | * | |
402 | * - the config file is mmap()ed and the part before the match (if any) is | |
403 | * written to the lock file, then the changed part and the rest. | |
404 | * | |
405 | * - the config file is removed and the lock file rename()d to it. | |
406 | * | |
407 | */ | |
408 | int git_config_set_multivar(const char* key, const char* value, | |
4ddba79d | 409 | const char* value_regex, int multi_replace) |
10bea152 JS |
410 | { |
411 | int i; | |
88fb958b | 412 | int fd, in_fd; |
3a2f2bb3 | 413 | char* config_filename = strdup(git_path("config")); |
10bea152 | 414 | char* lock_file = strdup(git_path("config.lock")); |
b17e659d | 415 | const char* last_dot = strrchr(key, '.'); |
4ddba79d | 416 | |
10bea152 JS |
417 | /* |
418 | * Since "key" actually contains the section name and the real | |
419 | * key name separated by a dot, we have to know where the dot is. | |
420 | */ | |
b17e659d JS |
421 | |
422 | if (last_dot == NULL) { | |
10bea152 JS |
423 | fprintf(stderr, "key does not contain a section: %s\n", key); |
424 | return 2; | |
425 | } | |
b17e659d JS |
426 | store.baselen = last_dot - key; |
427 | ||
428 | store.multi_replace = multi_replace; | |
10bea152 JS |
429 | |
430 | /* | |
431 | * Validate the key and while at it, lower case it for matching. | |
432 | */ | |
433 | store.key = (char*)malloc(strlen(key)+1); | |
434 | for (i = 0; key[i]; i++) | |
b17e659d JS |
435 | if (i != store.baselen && |
436 | ((!isalnum(key[i]) && key[i] != '.') || | |
437 | (i == store.baselen+1 && !isalpha(key[i])))) { | |
10bea152 JS |
438 | fprintf(stderr, "invalid key: %s\n", key); |
439 | free(store.key); | |
440 | return 1; | |
441 | } else | |
442 | store.key[i] = tolower(key[i]); | |
3dd94e3b | 443 | store.key[i] = 0; |
10bea152 JS |
444 | |
445 | /* | |
446 | * The lock_file serves a purpose in addition to locking: the new | |
447 | * contents of .git/config will be written into it. | |
448 | */ | |
449 | fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666); | |
450 | if (fd < 0) { | |
451 | fprintf(stderr, "could not lock config file\n"); | |
452 | free(store.key); | |
453 | return -1; | |
454 | } | |
455 | ||
456 | /* | |
457 | * If .git/config does not exist yet, write a minimal version. | |
458 | */ | |
88fb958b AR |
459 | in_fd = open(config_filename, O_RDONLY); |
460 | if ( in_fd < 0 ) { | |
10bea152 JS |
461 | free(store.key); |
462 | ||
88fb958b AR |
463 | if ( ENOENT != errno ) { |
464 | error("opening %s: %s", config_filename, | |
465 | strerror(errno)); | |
466 | close(fd); | |
467 | unlink(lock_file); | |
468 | return 3; /* same as "invalid config file" */ | |
469 | } | |
10bea152 JS |
470 | /* if nothing to unset, error out */ |
471 | if (value == NULL) { | |
472 | close(fd); | |
473 | unlink(lock_file); | |
474 | return 5; | |
475 | } | |
476 | ||
477 | store.key = (char*)key; | |
10bea152 JS |
478 | store_write_section(fd, key); |
479 | store_write_pair(fd, key, value); | |
480 | } else{ | |
88fb958b | 481 | struct stat st; |
10bea152 | 482 | char* contents; |
4ddba79d | 483 | int i, copy_begin, copy_end, new_line = 0; |
10bea152 JS |
484 | |
485 | if (value_regex == NULL) | |
486 | store.value_regex = NULL; | |
487 | else { | |
f98d863d JS |
488 | if (value_regex[0] == '!') { |
489 | store.do_not_match = 1; | |
490 | value_regex++; | |
491 | } else | |
492 | store.do_not_match = 0; | |
493 | ||
10bea152 JS |
494 | store.value_regex = (regex_t*)malloc(sizeof(regex_t)); |
495 | if (regcomp(store.value_regex, value_regex, | |
496 | REG_EXTENDED)) { | |
7246ed43 | 497 | fprintf(stderr, "Invalid pattern: %s\n", |
10bea152 JS |
498 | value_regex); |
499 | free(store.value_regex); | |
500 | return 6; | |
501 | } | |
502 | } | |
503 | ||
4ddba79d | 504 | store.offset[0] = 0; |
10bea152 JS |
505 | store.state = START; |
506 | store.seen = 0; | |
507 | ||
508 | /* | |
509 | * After this, store.offset will contain the *end* offset | |
510 | * of the last match, or remain at 0 if no match was found. | |
511 | * As a side effect, we make sure to transform only a valid | |
512 | * existing config file. | |
513 | */ | |
514 | if (git_config(store_aux)) { | |
515 | fprintf(stderr, "invalid config file\n"); | |
516 | free(store.key); | |
517 | if (store.value_regex != NULL) { | |
518 | regfree(store.value_regex); | |
519 | free(store.value_regex); | |
520 | } | |
521 | return 3; | |
522 | } | |
523 | ||
524 | free(store.key); | |
525 | if (store.value_regex != NULL) { | |
526 | regfree(store.value_regex); | |
527 | free(store.value_regex); | |
528 | } | |
529 | ||
4ddba79d JS |
530 | /* if nothing to unset, or too many matches, error out */ |
531 | if ((store.seen == 0 && value == NULL) || | |
532 | (store.seen > 1 && multi_replace == 0)) { | |
10bea152 JS |
533 | close(fd); |
534 | unlink(lock_file); | |
535 | return 5; | |
536 | } | |
537 | ||
88fb958b | 538 | fstat(in_fd, &st); |
10bea152 JS |
539 | contents = mmap(NULL, st.st_size, PROT_READ, |
540 | MAP_PRIVATE, in_fd, 0); | |
541 | close(in_fd); | |
542 | ||
4ddba79d JS |
543 | if (store.seen == 0) |
544 | store.seen = 1; | |
545 | ||
546 | for (i = 0, copy_begin = 0; i < store.seen; i++) { | |
547 | if (store.offset[i] == 0) { | |
548 | store.offset[i] = copy_end = st.st_size; | |
549 | } else if (store.state != KEY_SEEN) { | |
550 | copy_end = store.offset[i]; | |
10bea152 | 551 | } else |
4ddba79d JS |
552 | copy_end = find_beginning_of_line( |
553 | contents, st.st_size, | |
554 | store.offset[i]-2, &new_line); | |
555 | ||
556 | /* write the first part of the config */ | |
557 | if (copy_end > copy_begin) { | |
558 | write(fd, contents + copy_begin, | |
559 | copy_end - copy_begin); | |
560 | if (new_line) | |
561 | write(fd, "\n", 1); | |
562 | } | |
563 | copy_begin = store.offset[i]; | |
10bea152 JS |
564 | } |
565 | ||
10bea152 JS |
566 | /* write the pair (value == NULL means unset) */ |
567 | if (value != NULL) { | |
568 | if (store.state == START) | |
569 | store_write_section(fd, key); | |
570 | store_write_pair(fd, key, value); | |
571 | } | |
572 | ||
573 | /* write the rest of the config */ | |
4ddba79d JS |
574 | if (copy_begin < st.st_size) |
575 | write(fd, contents + copy_begin, | |
576 | st.st_size - copy_begin); | |
10bea152 JS |
577 | |
578 | munmap(contents, st.st_size); | |
3a2f2bb3 | 579 | unlink(config_filename); |
10bea152 JS |
580 | } |
581 | ||
582 | close(fd); | |
583 | ||
3a2f2bb3 | 584 | if (rename(lock_file, config_filename) < 0) { |
10bea152 JS |
585 | fprintf(stderr, "Could not rename the lock file?\n"); |
586 | return 4; | |
587 | } | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
4ddba79d | 592 |