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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; | |
14 | static int config_linenr; | |
15 | static int get_next_char(void) | |
16 | { | |
17 | int c; | |
18 | FILE *f; | |
19 | ||
20 | c = '\n'; | |
21 | if ((f = config_file) != NULL) { | |
22 | c = fgetc(f); | |
db2c075d JH |
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 | } | |
17712991 LT |
31 | if (c == '\n') |
32 | config_linenr++; | |
33 | if (c == EOF) { | |
34 | config_file = NULL; | |
35 | c = '\n'; | |
36 | } | |
37 | } | |
38 | return c; | |
39 | } | |
40 | ||
41 | static char *parse_value(void) | |
42 | { | |
43 | static char value[1024]; | |
44 | int quote = 0, comment = 0, len = 0, space = 0; | |
45 | ||
46 | 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 (space) { | |
63 | if (len) | |
64 | value[len++] = ' '; | |
65 | space = 0; | |
66 | } | |
67 | if (c == '\\') { | |
68 | c = get_next_char(); | |
69 | switch (c) { | |
70 | case '\n': | |
71 | continue; | |
72 | case 't': | |
73 | c = '\t'; | |
74 | break; | |
75 | case 'b': | |
76 | c = '\b'; | |
77 | break; | |
78 | case 'n': | |
79 | c = '\n'; | |
80 | break; | |
5cbb401d LT |
81 | /* Some characters escape as themselves */ |
82 | case '\\': case '"': | |
83 | break; | |
84 | /* Reject unknown escape sequences */ | |
85 | default: | |
86 | return NULL; | |
17712991 LT |
87 | } |
88 | value[len++] = c; | |
89 | continue; | |
90 | } | |
91 | if (c == '"') { | |
92 | quote = 1-quote; | |
93 | continue; | |
94 | } | |
95 | if (!quote) { | |
96 | if (c == ';' || c == '#') { | |
97 | comment = 1; | |
98 | continue; | |
99 | } | |
100 | } | |
101 | value[len++] = c; | |
102 | } | |
103 | } | |
104 | ||
105 | static int get_value(config_fn_t fn, char *name, unsigned int len) | |
106 | { | |
107 | int c; | |
108 | char *value; | |
109 | ||
110 | /* Get the full name */ | |
111 | for (;;) { | |
112 | c = get_next_char(); | |
113 | if (c == EOF) | |
114 | break; | |
115 | if (!isalnum(c)) | |
116 | break; | |
117 | name[len++] = tolower(c); | |
118 | if (len >= MAXNAME) | |
119 | return -1; | |
120 | } | |
121 | name[len] = 0; | |
122 | while (c == ' ' || c == '\t') | |
123 | c = get_next_char(); | |
124 | ||
125 | value = NULL; | |
126 | if (c != '\n') { | |
127 | if (c != '=') | |
128 | return -1; | |
129 | value = parse_value(); | |
130 | if (!value) | |
131 | return -1; | |
132 | } | |
133 | return fn(name, value); | |
134 | } | |
135 | ||
136 | static int get_base_var(char *name) | |
137 | { | |
138 | int baselen = 0; | |
139 | ||
140 | for (;;) { | |
141 | int c = get_next_char(); | |
142 | if (c == EOF) | |
143 | return -1; | |
144 | if (c == ']') | |
145 | return baselen; | |
146 | if (!isalnum(c)) | |
147 | return -1; | |
148 | if (baselen > MAXNAME / 2) | |
149 | return -1; | |
150 | name[baselen++] = tolower(c); | |
151 | } | |
152 | } | |
153 | ||
154 | static int git_parse_file(config_fn_t fn) | |
155 | { | |
156 | int comment = 0; | |
157 | int baselen = 0; | |
158 | static char var[MAXNAME]; | |
159 | ||
160 | for (;;) { | |
161 | int c = get_next_char(); | |
162 | if (c == '\n') { | |
163 | /* EOF? */ | |
164 | if (!config_file) | |
165 | return 0; | |
166 | comment = 0; | |
167 | continue; | |
168 | } | |
169 | if (comment || isspace(c)) | |
170 | continue; | |
171 | if (c == '#' || c == ';') { | |
172 | comment = 1; | |
173 | continue; | |
174 | } | |
175 | if (c == '[') { | |
176 | baselen = get_base_var(var); | |
177 | if (baselen <= 0) | |
178 | break; | |
179 | var[baselen++] = '.'; | |
180 | var[baselen] = 0; | |
181 | continue; | |
182 | } | |
183 | if (!isalpha(c)) | |
184 | break; | |
128af9d1 | 185 | var[baselen] = tolower(c); |
17712991 LT |
186 | if (get_value(fn, var, baselen+1) < 0) |
187 | break; | |
188 | } | |
189 | die("bad config file line %d", config_linenr); | |
190 | } | |
191 | ||
192 | int git_config_int(const char *name, const char *value) | |
193 | { | |
194 | if (value && *value) { | |
195 | char *end; | |
196 | int val = strtol(value, &end, 0); | |
197 | if (!*end) | |
198 | return val; | |
199 | } | |
200 | die("bad config value for '%s'", name); | |
201 | } | |
202 | ||
203 | int git_config_bool(const char *name, const char *value) | |
204 | { | |
205 | if (!value) | |
206 | return 1; | |
207 | if (!*value) | |
208 | return 0; | |
209 | if (!strcasecmp(value, "true")) | |
210 | return 1; | |
211 | if (!strcasecmp(value, "false")) | |
212 | return 0; | |
213 | return git_config_int(name, value) != 0; | |
214 | } | |
215 | ||
216 | int git_default_config(const char *var, const char *value) | |
217 | { | |
218 | /* This needs a better name */ | |
219 | if (!strcmp(var, "core.filemode")) { | |
220 | trust_executable_bit = git_config_bool(var, value); | |
221 | return 0; | |
222 | } | |
223 | ||
f8348be3 JS |
224 | if (!strcmp(var, "core.symrefsonly")) { |
225 | only_use_symrefs = git_config_bool(var, value); | |
226 | return 0; | |
227 | } | |
228 | ||
e1b10391 LT |
229 | if (!strcmp(var, "user.name")) { |
230 | strncpy(git_default_name, value, sizeof(git_default_name)); | |
231 | return 0; | |
232 | } | |
233 | ||
234 | if (!strcmp(var, "user.email")) { | |
235 | strncpy(git_default_email, value, sizeof(git_default_email)); | |
236 | return 0; | |
237 | } | |
238 | ||
3299c6f6 JH |
239 | if (!strcmp(var, "diff.renamelimit")) { |
240 | diff_rename_limit_default = git_config_int(var, value); | |
241 | return 0; | |
242 | } | |
243 | ||
17712991 LT |
244 | /* Add other config variables here.. */ |
245 | return 0; | |
246 | } | |
247 | ||
248 | int git_config(config_fn_t fn) | |
249 | { | |
250 | int ret; | |
251 | FILE *f = fopen(git_path("config"), "r"); | |
252 | ||
253 | ret = -1; | |
254 | if (f) { | |
255 | config_file = f; | |
256 | config_linenr = 1; | |
257 | ret = git_parse_file(fn); | |
258 | fclose(f); | |
259 | } | |
260 | return ret; | |
261 | } | |
10bea152 JS |
262 | |
263 | /* | |
264 | * Find all the stuff for git_config_set() below. | |
265 | */ | |
266 | static struct { | |
267 | int baselen; | |
268 | char* key; | |
269 | regex_t* value_regex; | |
270 | off_t offset; | |
271 | enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state; | |
272 | int seen; | |
273 | } store; | |
274 | ||
275 | static int store_aux(const char* key, const char* value) | |
276 | { | |
277 | switch (store.state) { | |
278 | case KEY_SEEN: | |
279 | if (!strcmp(key, store.key) && | |
280 | (store.value_regex == NULL || | |
281 | !regexec(store.value_regex, value, 0, NULL, 0))) { | |
282 | if (store.seen == 1) { | |
283 | fprintf(stderr, | |
284 | "Warning: %s has multiple values\n", | |
285 | key); | |
286 | } | |
287 | store.offset = ftell(config_file); | |
288 | store.seen++; | |
289 | } | |
290 | break; | |
291 | case SECTION_SEEN: | |
292 | if (strncmp(key, store.key, store.baselen+1)) { | |
293 | store.state = SECTION_END_SEEN; | |
294 | break; | |
295 | } else | |
296 | store.offset = ftell(config_file); | |
297 | /* fallthru */ | |
298 | case SECTION_END_SEEN: | |
299 | case START: | |
300 | if (!strcmp(key, store.key) && | |
301 | (store.value_regex == NULL || | |
302 | !regexec(store.value_regex, value, 0, NULL, 0))) { | |
303 | store.offset = ftell(config_file); | |
304 | store.state = KEY_SEEN; | |
305 | store.seen++; | |
306 | } else if(!strncmp(key, store.key, store.baselen)) | |
307 | store.state = SECTION_SEEN; | |
308 | } | |
309 | return 0; | |
310 | } | |
311 | ||
312 | static void store_write_section(int fd, const char* key) | |
313 | { | |
314 | write(fd, "[", 1); | |
315 | write(fd, key, store.baselen); | |
316 | write(fd, "]\n", 2); | |
317 | } | |
318 | ||
319 | static void store_write_pair(int fd, const char* key, const char* value) | |
320 | { | |
321 | int i; | |
322 | ||
323 | write(fd, "\t", 1); | |
324 | write(fd, key+store.baselen+1, | |
325 | strlen(key+store.baselen+1)); | |
326 | write(fd, " = ", 3); | |
327 | for (i = 0; value[i]; i++) | |
328 | switch (value[i]) { | |
329 | case '\n': write(fd, "\\n", 2); break; | |
330 | case '\t': write(fd, "\\t", 2); break; | |
331 | case '"': case '\\': write(fd, "\\", 1); | |
332 | default: write(fd, value+i, 1); | |
333 | } | |
334 | write(fd, "\n", 1); | |
335 | } | |
336 | ||
337 | int git_config_set(const char* key, const char* value) | |
338 | { | |
339 | return git_config_set_multivar(key, value, NULL); | |
340 | } | |
341 | ||
342 | /* | |
343 | * If value==NULL, unset in (remove from) config, | |
344 | * if value_regex!=NULL, disregard key/value pairs where value does not match. | |
345 | * | |
346 | * Returns 0 on success. | |
347 | * | |
348 | * This function does this: | |
349 | * | |
350 | * - it locks the config file by creating ".git/config.lock" | |
351 | * | |
352 | * - it then parses the config using store_aux() as validator to find | |
353 | * the position on the key/value pair to replace. If it is to be unset, | |
354 | * it must be found exactly once. | |
355 | * | |
356 | * - the config file is mmap()ed and the part before the match (if any) is | |
357 | * written to the lock file, then the changed part and the rest. | |
358 | * | |
359 | * - the config file is removed and the lock file rename()d to it. | |
360 | * | |
361 | */ | |
362 | int git_config_set_multivar(const char* key, const char* value, | |
363 | const char* value_regex) | |
364 | { | |
365 | int i; | |
366 | struct stat st; | |
367 | int fd; | |
368 | char* config_file = strdup(git_path("config")); | |
369 | char* lock_file = strdup(git_path("config.lock")); | |
370 | ||
371 | /* | |
372 | * Since "key" actually contains the section name and the real | |
373 | * key name separated by a dot, we have to know where the dot is. | |
374 | */ | |
375 | for (store.baselen = 0; | |
376 | key[store.baselen] != '.' && key[store.baselen]; | |
377 | store.baselen++); | |
378 | if (!key[store.baselen] || !key[store.baselen+1]) { | |
379 | fprintf(stderr, "key does not contain a section: %s\n", key); | |
380 | return 2; | |
381 | } | |
382 | ||
383 | /* | |
384 | * Validate the key and while at it, lower case it for matching. | |
385 | */ | |
386 | store.key = (char*)malloc(strlen(key)+1); | |
387 | for (i = 0; key[i]; i++) | |
388 | if (i != store.baselen && (!isalnum(key[i]) || | |
389 | (i == store.baselen+1 && !isalpha(key[i])))) { | |
390 | fprintf(stderr, "invalid key: %s\n", key); | |
391 | free(store.key); | |
392 | return 1; | |
393 | } else | |
394 | store.key[i] = tolower(key[i]); | |
395 | ||
396 | /* | |
397 | * The lock_file serves a purpose in addition to locking: the new | |
398 | * contents of .git/config will be written into it. | |
399 | */ | |
400 | fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666); | |
401 | if (fd < 0) { | |
402 | fprintf(stderr, "could not lock config file\n"); | |
403 | free(store.key); | |
404 | return -1; | |
405 | } | |
406 | ||
407 | /* | |
408 | * If .git/config does not exist yet, write a minimal version. | |
409 | */ | |
410 | if (stat(config_file, &st)) { | |
411 | static const char contents[] = | |
412 | "#\n" | |
413 | "# This is the config file\n" | |
414 | "#\n" | |
415 | "\n"; | |
416 | ||
417 | free(store.key); | |
418 | ||
419 | /* if nothing to unset, error out */ | |
420 | if (value == NULL) { | |
421 | close(fd); | |
422 | unlink(lock_file); | |
423 | return 5; | |
424 | } | |
425 | ||
426 | store.key = (char*)key; | |
427 | ||
428 | write(fd, contents, sizeof(contents)-1); | |
429 | store_write_section(fd, key); | |
430 | store_write_pair(fd, key, value); | |
431 | } else{ | |
432 | int in_fd; | |
433 | char* contents; | |
434 | int offset, new_line = 0; | |
435 | ||
436 | if (value_regex == NULL) | |
437 | store.value_regex = NULL; | |
438 | else { | |
439 | store.value_regex = (regex_t*)malloc(sizeof(regex_t)); | |
440 | if (regcomp(store.value_regex, value_regex, | |
441 | REG_EXTENDED)) { | |
442 | fprintf(stderr, "Invalid pattern: %s", | |
443 | value_regex); | |
444 | free(store.value_regex); | |
445 | return 6; | |
446 | } | |
447 | } | |
448 | ||
449 | store.offset = 0; | |
450 | store.state = START; | |
451 | store.seen = 0; | |
452 | ||
453 | /* | |
454 | * After this, store.offset will contain the *end* offset | |
455 | * of the last match, or remain at 0 if no match was found. | |
456 | * As a side effect, we make sure to transform only a valid | |
457 | * existing config file. | |
458 | */ | |
459 | if (git_config(store_aux)) { | |
460 | fprintf(stderr, "invalid config file\n"); | |
461 | free(store.key); | |
462 | if (store.value_regex != NULL) { | |
463 | regfree(store.value_regex); | |
464 | free(store.value_regex); | |
465 | } | |
466 | return 3; | |
467 | } | |
468 | ||
469 | free(store.key); | |
470 | if (store.value_regex != NULL) { | |
471 | regfree(store.value_regex); | |
472 | free(store.value_regex); | |
473 | } | |
474 | ||
475 | /* if nothing to unset, error out */ | |
476 | if (store.seen == 0 && value == NULL) { | |
477 | close(fd); | |
478 | unlink(lock_file); | |
479 | return 5; | |
480 | } | |
481 | ||
482 | store.key = (char*)key; | |
483 | ||
484 | in_fd = open(config_file, O_RDONLY, 0666); | |
485 | contents = mmap(NULL, st.st_size, PROT_READ, | |
486 | MAP_PRIVATE, in_fd, 0); | |
487 | close(in_fd); | |
488 | ||
489 | if (store.offset == 0) { | |
490 | store.offset = offset = st.st_size; | |
491 | } else if (store.state != KEY_SEEN) { | |
492 | offset = store.offset; | |
493 | } else { | |
494 | int equal_offset = st.st_size, | |
495 | bracket_offset = st.st_size; | |
496 | ||
497 | if (value == NULL && store.seen > 1) { | |
498 | fprintf(stderr, "Cannot remove multivar (%s has %d values\n", key, store.seen); | |
499 | close(fd); | |
500 | unlink(lock_file); | |
501 | return 7; | |
502 | } | |
503 | for (offset = store.offset-2; offset > 0 | |
504 | && contents[offset] != '\n'; offset--) | |
505 | switch (contents[offset]) { | |
506 | case '=': equal_offset = offset; break; | |
507 | case ']': bracket_offset = offset; break; | |
508 | } | |
509 | if (bracket_offset < equal_offset) { | |
510 | new_line = 1; | |
511 | offset = bracket_offset+1; | |
512 | } else | |
513 | offset++; | |
514 | } | |
515 | ||
516 | /* write the first part of the config */ | |
517 | write(fd, contents, offset); | |
518 | if (new_line) | |
519 | write(fd, "\n", 1); | |
520 | ||
521 | /* write the pair (value == NULL means unset) */ | |
522 | if (value != NULL) { | |
523 | if (store.state == START) | |
524 | store_write_section(fd, key); | |
525 | store_write_pair(fd, key, value); | |
526 | } | |
527 | ||
528 | /* write the rest of the config */ | |
529 | if (store.offset < st.st_size) | |
530 | write(fd, contents + store.offset, | |
531 | st.st_size - store.offset); | |
532 | ||
533 | munmap(contents, st.st_size); | |
534 | unlink(config_file); | |
535 | } | |
536 | ||
537 | close(fd); | |
538 | ||
539 | if (rename(lock_file, config_file) < 0) { | |
540 | fprintf(stderr, "Could not rename the lock file?\n"); | |
541 | return 4; | |
542 | } | |
543 | ||
544 | return 0; | |
545 | } | |
546 |