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1 | /* | |
2 | * Handle git attributes. See gitattributes(5) for a description of | |
3 | * the file syntax, and Documentation/technical/api-gitattributes.txt | |
4 | * for a description of the API. | |
5 | * | |
6 | * One basic design decision here is that we are not going to support | |
7 | * an insanely large number of attributes. | |
8 | */ | |
9 | ||
10 | #define NO_THE_INDEX_COMPATIBILITY_MACROS | |
11 | #include "cache.h" | |
12 | #include "exec_cmd.h" | |
13 | #include "attr.h" | |
14 | #include "dir.h" | |
15 | ||
16 | const char git_attr__true[] = "(builtin)true"; | |
17 | const char git_attr__false[] = "\0(builtin)false"; | |
18 | static const char git_attr__unknown[] = "(builtin)unknown"; | |
19 | #define ATTR__TRUE git_attr__true | |
20 | #define ATTR__FALSE git_attr__false | |
21 | #define ATTR__UNSET NULL | |
22 | #define ATTR__UNKNOWN git_attr__unknown | |
23 | ||
24 | /* This is a randomly chosen prime. */ | |
25 | #define HASHSIZE 257 | |
26 | ||
27 | #ifndef DEBUG_ATTR | |
28 | #define DEBUG_ATTR 0 | |
29 | #endif | |
30 | ||
31 | struct git_attr { | |
32 | struct git_attr *next; | |
33 | unsigned h; | |
34 | int attr_nr; | |
35 | char name[FLEX_ARRAY]; | |
36 | }; | |
37 | static int attr_nr; | |
38 | ||
39 | static struct git_attr_check *check_all_attr; | |
40 | static struct git_attr *(git_attr_hash[HASHSIZE]); | |
41 | ||
42 | char *git_attr_name(struct git_attr *attr) | |
43 | { | |
44 | return attr->name; | |
45 | } | |
46 | ||
47 | static unsigned hash_name(const char *name, int namelen) | |
48 | { | |
49 | unsigned val = 0, c; | |
50 | ||
51 | while (namelen--) { | |
52 | c = *name++; | |
53 | val = ((val << 7) | (val >> 22)) ^ c; | |
54 | } | |
55 | return val; | |
56 | } | |
57 | ||
58 | static int invalid_attr_name(const char *name, int namelen) | |
59 | { | |
60 | /* | |
61 | * Attribute name cannot begin with '-' and must consist of | |
62 | * characters from [-A-Za-z0-9_.]. | |
63 | */ | |
64 | if (namelen <= 0 || *name == '-') | |
65 | return -1; | |
66 | while (namelen--) { | |
67 | char ch = *name++; | |
68 | if (! (ch == '-' || ch == '.' || ch == '_' || | |
69 | ('0' <= ch && ch <= '9') || | |
70 | ('a' <= ch && ch <= 'z') || | |
71 | ('A' <= ch && ch <= 'Z')) ) | |
72 | return -1; | |
73 | } | |
74 | return 0; | |
75 | } | |
76 | ||
77 | static struct git_attr *git_attr_internal(const char *name, int len) | |
78 | { | |
79 | unsigned hval = hash_name(name, len); | |
80 | unsigned pos = hval % HASHSIZE; | |
81 | struct git_attr *a; | |
82 | ||
83 | for (a = git_attr_hash[pos]; a; a = a->next) { | |
84 | if (a->h == hval && | |
85 | !memcmp(a->name, name, len) && !a->name[len]) | |
86 | return a; | |
87 | } | |
88 | ||
89 | if (invalid_attr_name(name, len)) | |
90 | return NULL; | |
91 | ||
92 | a = xmalloc(sizeof(*a) + len + 1); | |
93 | memcpy(a->name, name, len); | |
94 | a->name[len] = 0; | |
95 | a->h = hval; | |
96 | a->next = git_attr_hash[pos]; | |
97 | a->attr_nr = attr_nr++; | |
98 | git_attr_hash[pos] = a; | |
99 | ||
100 | check_all_attr = xrealloc(check_all_attr, | |
101 | sizeof(*check_all_attr) * attr_nr); | |
102 | check_all_attr[a->attr_nr].attr = a; | |
103 | check_all_attr[a->attr_nr].value = ATTR__UNKNOWN; | |
104 | return a; | |
105 | } | |
106 | ||
107 | struct git_attr *git_attr(const char *name) | |
108 | { | |
109 | return git_attr_internal(name, strlen(name)); | |
110 | } | |
111 | ||
112 | /* What does a matched pattern decide? */ | |
113 | struct attr_state { | |
114 | struct git_attr *attr; | |
115 | const char *setto; | |
116 | }; | |
117 | ||
118 | struct pattern { | |
119 | const char *pattern; | |
120 | int patternlen; | |
121 | int nowildcardlen; | |
122 | int flags; /* EXC_FLAG_* */ | |
123 | }; | |
124 | ||
125 | /* | |
126 | * One rule, as from a .gitattributes file. | |
127 | * | |
128 | * If is_macro is true, then u.attr is a pointer to the git_attr being | |
129 | * defined. | |
130 | * | |
131 | * If is_macro is false, then u.pattern points at the filename pattern | |
132 | * to which the rule applies. (The memory pointed to is part of the | |
133 | * memory block allocated for the match_attr instance.) | |
134 | * | |
135 | * In either case, num_attr is the number of attributes affected by | |
136 | * this rule, and state is an array listing them. The attributes are | |
137 | * listed as they appear in the file (macros unexpanded). | |
138 | */ | |
139 | struct match_attr { | |
140 | union { | |
141 | struct pattern pat; | |
142 | struct git_attr *attr; | |
143 | } u; | |
144 | char is_macro; | |
145 | unsigned num_attr; | |
146 | struct attr_state state[FLEX_ARRAY]; | |
147 | }; | |
148 | ||
149 | static const char blank[] = " \t\r\n"; | |
150 | ||
151 | /* | |
152 | * Parse a whitespace-delimited attribute state (i.e., "attr", | |
153 | * "-attr", "!attr", or "attr=value") from the string starting at src. | |
154 | * If e is not NULL, write the results to *e. Return a pointer to the | |
155 | * remainder of the string (with leading whitespace removed), or NULL | |
156 | * if there was an error. | |
157 | */ | |
158 | static const char *parse_attr(const char *src, int lineno, const char *cp, | |
159 | struct attr_state *e) | |
160 | { | |
161 | const char *ep, *equals; | |
162 | int len; | |
163 | ||
164 | ep = cp + strcspn(cp, blank); | |
165 | equals = strchr(cp, '='); | |
166 | if (equals && ep < equals) | |
167 | equals = NULL; | |
168 | if (equals) | |
169 | len = equals - cp; | |
170 | else | |
171 | len = ep - cp; | |
172 | if (!e) { | |
173 | if (*cp == '-' || *cp == '!') { | |
174 | cp++; | |
175 | len--; | |
176 | } | |
177 | if (invalid_attr_name(cp, len)) { | |
178 | fprintf(stderr, | |
179 | "%.*s is not a valid attribute name: %s:%d\n", | |
180 | len, cp, src, lineno); | |
181 | return NULL; | |
182 | } | |
183 | } else { | |
184 | if (*cp == '-' || *cp == '!') { | |
185 | e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET; | |
186 | cp++; | |
187 | len--; | |
188 | } | |
189 | else if (!equals) | |
190 | e->setto = ATTR__TRUE; | |
191 | else { | |
192 | e->setto = xmemdupz(equals + 1, ep - equals - 1); | |
193 | } | |
194 | e->attr = git_attr_internal(cp, len); | |
195 | } | |
196 | return ep + strspn(ep, blank); | |
197 | } | |
198 | ||
199 | static struct match_attr *parse_attr_line(const char *line, const char *src, | |
200 | int lineno, int macro_ok) | |
201 | { | |
202 | int namelen; | |
203 | int num_attr, i; | |
204 | const char *cp, *name, *states; | |
205 | struct match_attr *res = NULL; | |
206 | int is_macro; | |
207 | ||
208 | cp = line + strspn(line, blank); | |
209 | if (!*cp || *cp == '#') | |
210 | return NULL; | |
211 | name = cp; | |
212 | namelen = strcspn(name, blank); | |
213 | if (strlen(ATTRIBUTE_MACRO_PREFIX) < namelen && | |
214 | !prefixcmp(name, ATTRIBUTE_MACRO_PREFIX)) { | |
215 | if (!macro_ok) { | |
216 | fprintf(stderr, "%s not allowed: %s:%d\n", | |
217 | name, src, lineno); | |
218 | return NULL; | |
219 | } | |
220 | is_macro = 1; | |
221 | name += strlen(ATTRIBUTE_MACRO_PREFIX); | |
222 | name += strspn(name, blank); | |
223 | namelen = strcspn(name, blank); | |
224 | if (invalid_attr_name(name, namelen)) { | |
225 | fprintf(stderr, | |
226 | "%.*s is not a valid attribute name: %s:%d\n", | |
227 | namelen, name, src, lineno); | |
228 | return NULL; | |
229 | } | |
230 | } | |
231 | else | |
232 | is_macro = 0; | |
233 | ||
234 | states = name + namelen; | |
235 | states += strspn(states, blank); | |
236 | ||
237 | /* First pass to count the attr_states */ | |
238 | for (cp = states, num_attr = 0; *cp; num_attr++) { | |
239 | cp = parse_attr(src, lineno, cp, NULL); | |
240 | if (!cp) | |
241 | return NULL; | |
242 | } | |
243 | ||
244 | res = xcalloc(1, | |
245 | sizeof(*res) + | |
246 | sizeof(struct attr_state) * num_attr + | |
247 | (is_macro ? 0 : namelen + 1)); | |
248 | if (is_macro) | |
249 | res->u.attr = git_attr_internal(name, namelen); | |
250 | else { | |
251 | char *p = (char *)&(res->state[num_attr]); | |
252 | memcpy(p, name, namelen); | |
253 | res->u.pat.pattern = p; | |
254 | parse_exclude_pattern(&res->u.pat.pattern, | |
255 | &res->u.pat.patternlen, | |
256 | &res->u.pat.flags, | |
257 | &res->u.pat.nowildcardlen); | |
258 | if (res->u.pat.flags & EXC_FLAG_NEGATIVE) | |
259 | die(_("Negative patterns are forbidden in git attributes\n" | |
260 | "Use '\\!' for literal leading exclamation.")); | |
261 | } | |
262 | res->is_macro = is_macro; | |
263 | res->num_attr = num_attr; | |
264 | ||
265 | /* Second pass to fill the attr_states */ | |
266 | for (cp = states, i = 0; *cp; i++) { | |
267 | cp = parse_attr(src, lineno, cp, &(res->state[i])); | |
268 | } | |
269 | ||
270 | return res; | |
271 | } | |
272 | ||
273 | /* | |
274 | * Like info/exclude and .gitignore, the attribute information can | |
275 | * come from many places. | |
276 | * | |
277 | * (1) .gitattribute file of the same directory; | |
278 | * (2) .gitattribute file of the parent directory if (1) does not have | |
279 | * any match; this goes recursively upwards, just like .gitignore. | |
280 | * (3) $GIT_DIR/info/attributes, which overrides both of the above. | |
281 | * | |
282 | * In the same file, later entries override the earlier match, so in the | |
283 | * global list, we would have entries from info/attributes the earliest | |
284 | * (reading the file from top to bottom), .gitattribute of the root | |
285 | * directory (again, reading the file from top to bottom) down to the | |
286 | * current directory, and then scan the list backwards to find the first match. | |
287 | * This is exactly the same as what excluded() does in dir.c to deal with | |
288 | * .gitignore | |
289 | */ | |
290 | ||
291 | static struct attr_stack { | |
292 | struct attr_stack *prev; | |
293 | char *origin; | |
294 | size_t originlen; | |
295 | unsigned num_matches; | |
296 | unsigned alloc; | |
297 | struct match_attr **attrs; | |
298 | } *attr_stack; | |
299 | ||
300 | static void free_attr_elem(struct attr_stack *e) | |
301 | { | |
302 | int i; | |
303 | free(e->origin); | |
304 | for (i = 0; i < e->num_matches; i++) { | |
305 | struct match_attr *a = e->attrs[i]; | |
306 | int j; | |
307 | for (j = 0; j < a->num_attr; j++) { | |
308 | const char *setto = a->state[j].setto; | |
309 | if (setto == ATTR__TRUE || | |
310 | setto == ATTR__FALSE || | |
311 | setto == ATTR__UNSET || | |
312 | setto == ATTR__UNKNOWN) | |
313 | ; | |
314 | else | |
315 | free((char *) setto); | |
316 | } | |
317 | free(a); | |
318 | } | |
319 | free(e->attrs); | |
320 | free(e); | |
321 | } | |
322 | ||
323 | static const char *builtin_attr[] = { | |
324 | "[attr]binary -diff -merge -text", | |
325 | NULL, | |
326 | }; | |
327 | ||
328 | static void handle_attr_line(struct attr_stack *res, | |
329 | const char *line, | |
330 | const char *src, | |
331 | int lineno, | |
332 | int macro_ok) | |
333 | { | |
334 | struct match_attr *a; | |
335 | ||
336 | a = parse_attr_line(line, src, lineno, macro_ok); | |
337 | if (!a) | |
338 | return; | |
339 | if (res->alloc <= res->num_matches) { | |
340 | res->alloc = alloc_nr(res->num_matches); | |
341 | res->attrs = xrealloc(res->attrs, | |
342 | sizeof(struct match_attr *) * | |
343 | res->alloc); | |
344 | } | |
345 | res->attrs[res->num_matches++] = a; | |
346 | } | |
347 | ||
348 | static struct attr_stack *read_attr_from_array(const char **list) | |
349 | { | |
350 | struct attr_stack *res; | |
351 | const char *line; | |
352 | int lineno = 0; | |
353 | ||
354 | res = xcalloc(1, sizeof(*res)); | |
355 | while ((line = *(list++)) != NULL) | |
356 | handle_attr_line(res, line, "[builtin]", ++lineno, 1); | |
357 | return res; | |
358 | } | |
359 | ||
360 | static enum git_attr_direction direction; | |
361 | static struct index_state *use_index; | |
362 | ||
363 | static struct attr_stack *read_attr_from_file(const char *path, int macro_ok) | |
364 | { | |
365 | FILE *fp = fopen(path, "r"); | |
366 | struct attr_stack *res; | |
367 | char buf[2048]; | |
368 | int lineno = 0; | |
369 | ||
370 | if (!fp) { | |
371 | if (errno != ENOENT && errno != ENOTDIR) | |
372 | warn_on_inaccessible(path); | |
373 | return NULL; | |
374 | } | |
375 | res = xcalloc(1, sizeof(*res)); | |
376 | while (fgets(buf, sizeof(buf), fp)) | |
377 | handle_attr_line(res, buf, path, ++lineno, macro_ok); | |
378 | fclose(fp); | |
379 | return res; | |
380 | } | |
381 | ||
382 | static void *read_index_data(const char *path) | |
383 | { | |
384 | int pos, len; | |
385 | unsigned long sz; | |
386 | enum object_type type; | |
387 | void *data; | |
388 | struct index_state *istate = use_index ? use_index : &the_index; | |
389 | ||
390 | len = strlen(path); | |
391 | pos = index_name_pos(istate, path, len); | |
392 | if (pos < 0) { | |
393 | /* | |
394 | * We might be in the middle of a merge, in which | |
395 | * case we would read stage #2 (ours). | |
396 | */ | |
397 | int i; | |
398 | for (i = -pos - 1; | |
399 | (pos < 0 && i < istate->cache_nr && | |
400 | !strcmp(istate->cache[i]->name, path)); | |
401 | i++) | |
402 | if (ce_stage(istate->cache[i]) == 2) | |
403 | pos = i; | |
404 | } | |
405 | if (pos < 0) | |
406 | return NULL; | |
407 | data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz); | |
408 | if (!data || type != OBJ_BLOB) { | |
409 | free(data); | |
410 | return NULL; | |
411 | } | |
412 | return data; | |
413 | } | |
414 | ||
415 | static struct attr_stack *read_attr_from_index(const char *path, int macro_ok) | |
416 | { | |
417 | struct attr_stack *res; | |
418 | char *buf, *sp; | |
419 | int lineno = 0; | |
420 | ||
421 | buf = read_index_data(path); | |
422 | if (!buf) | |
423 | return NULL; | |
424 | ||
425 | res = xcalloc(1, sizeof(*res)); | |
426 | for (sp = buf; *sp; ) { | |
427 | char *ep; | |
428 | int more; | |
429 | for (ep = sp; *ep && *ep != '\n'; ep++) | |
430 | ; | |
431 | more = (*ep == '\n'); | |
432 | *ep = '\0'; | |
433 | handle_attr_line(res, sp, path, ++lineno, macro_ok); | |
434 | sp = ep + more; | |
435 | } | |
436 | free(buf); | |
437 | return res; | |
438 | } | |
439 | ||
440 | static struct attr_stack *read_attr(const char *path, int macro_ok) | |
441 | { | |
442 | struct attr_stack *res; | |
443 | ||
444 | if (direction == GIT_ATTR_CHECKOUT) { | |
445 | res = read_attr_from_index(path, macro_ok); | |
446 | if (!res) | |
447 | res = read_attr_from_file(path, macro_ok); | |
448 | } | |
449 | else if (direction == GIT_ATTR_CHECKIN) { | |
450 | res = read_attr_from_file(path, macro_ok); | |
451 | if (!res) | |
452 | /* | |
453 | * There is no checked out .gitattributes file there, but | |
454 | * we might have it in the index. We allow operation in a | |
455 | * sparsely checked out work tree, so read from it. | |
456 | */ | |
457 | res = read_attr_from_index(path, macro_ok); | |
458 | } | |
459 | else | |
460 | res = read_attr_from_index(path, macro_ok); | |
461 | if (!res) | |
462 | res = xcalloc(1, sizeof(*res)); | |
463 | return res; | |
464 | } | |
465 | ||
466 | #if DEBUG_ATTR | |
467 | static void debug_info(const char *what, struct attr_stack *elem) | |
468 | { | |
469 | fprintf(stderr, "%s: %s\n", what, elem->origin ? elem->origin : "()"); | |
470 | } | |
471 | static void debug_set(const char *what, const char *match, struct git_attr *attr, const void *v) | |
472 | { | |
473 | const char *value = v; | |
474 | ||
475 | if (ATTR_TRUE(value)) | |
476 | value = "set"; | |
477 | else if (ATTR_FALSE(value)) | |
478 | value = "unset"; | |
479 | else if (ATTR_UNSET(value)) | |
480 | value = "unspecified"; | |
481 | ||
482 | fprintf(stderr, "%s: %s => %s (%s)\n", | |
483 | what, attr->name, (char *) value, match); | |
484 | } | |
485 | #define debug_push(a) debug_info("push", (a)) | |
486 | #define debug_pop(a) debug_info("pop", (a)) | |
487 | #else | |
488 | #define debug_push(a) do { ; } while (0) | |
489 | #define debug_pop(a) do { ; } while (0) | |
490 | #define debug_set(a,b,c,d) do { ; } while (0) | |
491 | #endif | |
492 | ||
493 | static void drop_attr_stack(void) | |
494 | { | |
495 | while (attr_stack) { | |
496 | struct attr_stack *elem = attr_stack; | |
497 | attr_stack = elem->prev; | |
498 | free_attr_elem(elem); | |
499 | } | |
500 | } | |
501 | ||
502 | static const char *git_etc_gitattributes(void) | |
503 | { | |
504 | static const char *system_wide; | |
505 | if (!system_wide) | |
506 | system_wide = system_path(ETC_GITATTRIBUTES); | |
507 | return system_wide; | |
508 | } | |
509 | ||
510 | static int git_attr_system(void) | |
511 | { | |
512 | return !git_env_bool("GIT_ATTR_NOSYSTEM", 0); | |
513 | } | |
514 | ||
515 | static void bootstrap_attr_stack(void) | |
516 | { | |
517 | struct attr_stack *elem; | |
518 | char *xdg_attributes_file; | |
519 | ||
520 | if (attr_stack) | |
521 | return; | |
522 | ||
523 | elem = read_attr_from_array(builtin_attr); | |
524 | elem->origin = NULL; | |
525 | elem->prev = attr_stack; | |
526 | attr_stack = elem; | |
527 | ||
528 | if (git_attr_system()) { | |
529 | elem = read_attr_from_file(git_etc_gitattributes(), 1); | |
530 | if (elem) { | |
531 | elem->origin = NULL; | |
532 | elem->prev = attr_stack; | |
533 | attr_stack = elem; | |
534 | } | |
535 | } | |
536 | ||
537 | if (!git_attributes_file) { | |
538 | home_config_paths(NULL, &xdg_attributes_file, "attributes"); | |
539 | git_attributes_file = xdg_attributes_file; | |
540 | } | |
541 | if (git_attributes_file) { | |
542 | elem = read_attr_from_file(git_attributes_file, 1); | |
543 | if (elem) { | |
544 | elem->origin = NULL; | |
545 | elem->prev = attr_stack; | |
546 | attr_stack = elem; | |
547 | } | |
548 | } | |
549 | ||
550 | if (!is_bare_repository() || direction == GIT_ATTR_INDEX) { | |
551 | elem = read_attr(GITATTRIBUTES_FILE, 1); | |
552 | elem->origin = xstrdup(""); | |
553 | elem->originlen = 0; | |
554 | elem->prev = attr_stack; | |
555 | attr_stack = elem; | |
556 | debug_push(elem); | |
557 | } | |
558 | ||
559 | elem = read_attr_from_file(git_path(INFOATTRIBUTES_FILE), 1); | |
560 | if (!elem) | |
561 | elem = xcalloc(1, sizeof(*elem)); | |
562 | elem->origin = NULL; | |
563 | elem->prev = attr_stack; | |
564 | attr_stack = elem; | |
565 | } | |
566 | ||
567 | static void prepare_attr_stack(const char *path, int dirlen) | |
568 | { | |
569 | struct attr_stack *elem, *info; | |
570 | int len; | |
571 | const char *cp; | |
572 | ||
573 | /* | |
574 | * At the bottom of the attribute stack is the built-in | |
575 | * set of attribute definitions, followed by the contents | |
576 | * of $(prefix)/etc/gitattributes and a file specified by | |
577 | * core.attributesfile. Then, contents from | |
578 | * .gitattribute files from directories closer to the | |
579 | * root to the ones in deeper directories are pushed | |
580 | * to the stack. Finally, at the very top of the stack | |
581 | * we always keep the contents of $GIT_DIR/info/attributes. | |
582 | * | |
583 | * When checking, we use entries from near the top of the | |
584 | * stack, preferring $GIT_DIR/info/attributes, then | |
585 | * .gitattributes in deeper directories to shallower ones, | |
586 | * and finally use the built-in set as the default. | |
587 | */ | |
588 | bootstrap_attr_stack(); | |
589 | ||
590 | /* | |
591 | * Pop the "info" one that is always at the top of the stack. | |
592 | */ | |
593 | info = attr_stack; | |
594 | attr_stack = info->prev; | |
595 | ||
596 | /* | |
597 | * Pop the ones from directories that are not the prefix of | |
598 | * the path we are checking. Break out of the loop when we see | |
599 | * the root one (whose origin is an empty string "") or the builtin | |
600 | * one (whose origin is NULL) without popping it. | |
601 | */ | |
602 | while (attr_stack->origin) { | |
603 | int namelen = strlen(attr_stack->origin); | |
604 | ||
605 | elem = attr_stack; | |
606 | if (namelen <= dirlen && | |
607 | !strncmp(elem->origin, path, namelen) && | |
608 | (!namelen || path[namelen] == '/')) | |
609 | break; | |
610 | ||
611 | debug_pop(elem); | |
612 | attr_stack = elem->prev; | |
613 | free_attr_elem(elem); | |
614 | } | |
615 | ||
616 | /* | |
617 | * Read from parent directories and push them down | |
618 | */ | |
619 | if (!is_bare_repository() || direction == GIT_ATTR_INDEX) { | |
620 | /* | |
621 | * bootstrap_attr_stack() should have added, and the | |
622 | * above loop should have stopped before popping, the | |
623 | * root element whose attr_stack->origin is set to an | |
624 | * empty string. | |
625 | */ | |
626 | struct strbuf pathbuf = STRBUF_INIT; | |
627 | ||
628 | assert(attr_stack->origin); | |
629 | while (1) { | |
630 | len = strlen(attr_stack->origin); | |
631 | if (dirlen <= len) | |
632 | break; | |
633 | cp = memchr(path + len + 1, '/', dirlen - len - 1); | |
634 | if (!cp) | |
635 | cp = path + dirlen; | |
636 | strbuf_add(&pathbuf, path, cp - path); | |
637 | strbuf_addch(&pathbuf, '/'); | |
638 | strbuf_addstr(&pathbuf, GITATTRIBUTES_FILE); | |
639 | elem = read_attr(pathbuf.buf, 0); | |
640 | strbuf_setlen(&pathbuf, cp - path); | |
641 | elem->origin = strbuf_detach(&pathbuf, &elem->originlen); | |
642 | elem->prev = attr_stack; | |
643 | attr_stack = elem; | |
644 | debug_push(elem); | |
645 | } | |
646 | ||
647 | strbuf_release(&pathbuf); | |
648 | } | |
649 | ||
650 | /* | |
651 | * Finally push the "info" one at the top of the stack. | |
652 | */ | |
653 | info->prev = attr_stack; | |
654 | attr_stack = info; | |
655 | } | |
656 | ||
657 | static int path_matches(const char *pathname, int pathlen, | |
658 | const char *basename, | |
659 | const struct pattern *pat, | |
660 | const char *base, int baselen) | |
661 | { | |
662 | const char *pattern = pat->pattern; | |
663 | int prefix = pat->nowildcardlen; | |
664 | ||
665 | if ((pat->flags & EXC_FLAG_MUSTBEDIR) && | |
666 | ((!pathlen) || (pathname[pathlen-1] != '/'))) | |
667 | return 0; | |
668 | ||
669 | if (pat->flags & EXC_FLAG_NODIR) { | |
670 | return match_basename(basename, | |
671 | pathlen - (basename - pathname), | |
672 | pattern, prefix, | |
673 | pat->patternlen, pat->flags); | |
674 | } | |
675 | return match_pathname(pathname, pathlen, | |
676 | base, baselen, | |
677 | pattern, prefix, pat->patternlen, pat->flags); | |
678 | } | |
679 | ||
680 | static int macroexpand_one(int attr_nr, int rem); | |
681 | ||
682 | static int fill_one(const char *what, struct match_attr *a, int rem) | |
683 | { | |
684 | struct git_attr_check *check = check_all_attr; | |
685 | int i; | |
686 | ||
687 | for (i = a->num_attr - 1; 0 < rem && 0 <= i; i--) { | |
688 | struct git_attr *attr = a->state[i].attr; | |
689 | const char **n = &(check[attr->attr_nr].value); | |
690 | const char *v = a->state[i].setto; | |
691 | ||
692 | if (*n == ATTR__UNKNOWN) { | |
693 | debug_set(what, | |
694 | a->is_macro ? a->u.attr->name : a->u.pattern, | |
695 | attr, v); | |
696 | *n = v; | |
697 | rem--; | |
698 | rem = macroexpand_one(attr->attr_nr, rem); | |
699 | } | |
700 | } | |
701 | return rem; | |
702 | } | |
703 | ||
704 | static int fill(const char *path, int pathlen, const char *basename, | |
705 | struct attr_stack *stk, int rem) | |
706 | { | |
707 | int i; | |
708 | const char *base = stk->origin ? stk->origin : ""; | |
709 | ||
710 | for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) { | |
711 | struct match_attr *a = stk->attrs[i]; | |
712 | if (a->is_macro) | |
713 | continue; | |
714 | if (path_matches(path, pathlen, basename, | |
715 | &a->u.pat, base, stk->originlen)) | |
716 | rem = fill_one("fill", a, rem); | |
717 | } | |
718 | return rem; | |
719 | } | |
720 | ||
721 | static int macroexpand_one(int attr_nr, int rem) | |
722 | { | |
723 | struct attr_stack *stk; | |
724 | struct match_attr *a = NULL; | |
725 | int i; | |
726 | ||
727 | if (check_all_attr[attr_nr].value != ATTR__TRUE) | |
728 | return rem; | |
729 | ||
730 | for (stk = attr_stack; !a && stk; stk = stk->prev) | |
731 | for (i = stk->num_matches - 1; !a && 0 <= i; i--) { | |
732 | struct match_attr *ma = stk->attrs[i]; | |
733 | if (!ma->is_macro) | |
734 | continue; | |
735 | if (ma->u.attr->attr_nr == attr_nr) | |
736 | a = ma; | |
737 | } | |
738 | ||
739 | if (a) | |
740 | rem = fill_one("expand", a, rem); | |
741 | ||
742 | return rem; | |
743 | } | |
744 | ||
745 | /* | |
746 | * Collect all attributes for path into the array pointed to by | |
747 | * check_all_attr. | |
748 | */ | |
749 | static void collect_all_attrs(const char *path) | |
750 | { | |
751 | struct attr_stack *stk; | |
752 | int i, pathlen, rem, dirlen; | |
753 | const char *basename, *cp, *last_slash = NULL; | |
754 | ||
755 | for (cp = path; *cp; cp++) { | |
756 | if (*cp == '/' && cp[1]) | |
757 | last_slash = cp; | |
758 | } | |
759 | pathlen = cp - path; | |
760 | if (last_slash) { | |
761 | basename = last_slash + 1; | |
762 | dirlen = last_slash - path; | |
763 | } else { | |
764 | basename = path; | |
765 | dirlen = 0; | |
766 | } | |
767 | ||
768 | prepare_attr_stack(path, dirlen); | |
769 | for (i = 0; i < attr_nr; i++) | |
770 | check_all_attr[i].value = ATTR__UNKNOWN; | |
771 | ||
772 | rem = attr_nr; | |
773 | for (stk = attr_stack; 0 < rem && stk; stk = stk->prev) | |
774 | rem = fill(path, pathlen, basename, stk, rem); | |
775 | } | |
776 | ||
777 | int git_check_attr(const char *path, int num, struct git_attr_check *check) | |
778 | { | |
779 | int i; | |
780 | ||
781 | collect_all_attrs(path); | |
782 | ||
783 | for (i = 0; i < num; i++) { | |
784 | const char *value = check_all_attr[check[i].attr->attr_nr].value; | |
785 | if (value == ATTR__UNKNOWN) | |
786 | value = ATTR__UNSET; | |
787 | check[i].value = value; | |
788 | } | |
789 | ||
790 | return 0; | |
791 | } | |
792 | ||
793 | int git_all_attrs(const char *path, int *num, struct git_attr_check **check) | |
794 | { | |
795 | int i, count, j; | |
796 | ||
797 | collect_all_attrs(path); | |
798 | ||
799 | /* Count the number of attributes that are set. */ | |
800 | count = 0; | |
801 | for (i = 0; i < attr_nr; i++) { | |
802 | const char *value = check_all_attr[i].value; | |
803 | if (value != ATTR__UNSET && value != ATTR__UNKNOWN) | |
804 | ++count; | |
805 | } | |
806 | *num = count; | |
807 | *check = xmalloc(sizeof(**check) * count); | |
808 | j = 0; | |
809 | for (i = 0; i < attr_nr; i++) { | |
810 | const char *value = check_all_attr[i].value; | |
811 | if (value != ATTR__UNSET && value != ATTR__UNKNOWN) { | |
812 | (*check)[j].attr = check_all_attr[i].attr; | |
813 | (*check)[j].value = value; | |
814 | ++j; | |
815 | } | |
816 | } | |
817 | ||
818 | return 0; | |
819 | } | |
820 | ||
821 | void git_attr_set_direction(enum git_attr_direction new, struct index_state *istate) | |
822 | { | |
823 | enum git_attr_direction old = direction; | |
824 | ||
825 | if (is_bare_repository() && new != GIT_ATTR_INDEX) | |
826 | die("BUG: non-INDEX attr direction in a bare repo"); | |
827 | ||
828 | direction = new; | |
829 | if (new != old) | |
830 | drop_attr_stack(); | |
831 | use_index = istate; | |
832 | } |