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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 | #include "utf8.h" | |
16 | ||
17 | const char git_attr__true[] = "(builtin)true"; | |
18 | const char git_attr__false[] = "\0(builtin)false"; | |
19 | static const char git_attr__unknown[] = "(builtin)unknown"; | |
20 | #define ATTR__TRUE git_attr__true | |
21 | #define ATTR__FALSE git_attr__false | |
22 | #define ATTR__UNSET NULL | |
23 | #define ATTR__UNKNOWN git_attr__unknown | |
24 | ||
25 | /* This is a randomly chosen prime. */ | |
26 | #define HASHSIZE 257 | |
27 | ||
28 | #ifndef DEBUG_ATTR | |
29 | #define DEBUG_ATTR 0 | |
30 | #endif | |
31 | ||
32 | struct git_attr { | |
33 | struct git_attr *next; | |
34 | unsigned h; | |
35 | int attr_nr; | |
36 | int maybe_macro; | |
37 | int maybe_real; | |
38 | char name[FLEX_ARRAY]; | |
39 | }; | |
40 | static int attr_nr; | |
41 | static int cannot_trust_maybe_real; | |
42 | ||
43 | static struct git_attr_check *check_all_attr; | |
44 | static struct git_attr *(git_attr_hash[HASHSIZE]); | |
45 | ||
46 | const char *git_attr_name(const struct git_attr *attr) | |
47 | { | |
48 | return attr->name; | |
49 | } | |
50 | ||
51 | static unsigned hash_name(const char *name, int namelen) | |
52 | { | |
53 | unsigned val = 0, c; | |
54 | ||
55 | while (namelen--) { | |
56 | c = *name++; | |
57 | val = ((val << 7) | (val >> 22)) ^ c; | |
58 | } | |
59 | return val; | |
60 | } | |
61 | ||
62 | static int invalid_attr_name(const char *name, int namelen) | |
63 | { | |
64 | /* | |
65 | * Attribute name cannot begin with '-' and must consist of | |
66 | * characters from [-A-Za-z0-9_.]. | |
67 | */ | |
68 | if (namelen <= 0 || *name == '-') | |
69 | return -1; | |
70 | while (namelen--) { | |
71 | char ch = *name++; | |
72 | if (! (ch == '-' || ch == '.' || ch == '_' || | |
73 | ('0' <= ch && ch <= '9') || | |
74 | ('a' <= ch && ch <= 'z') || | |
75 | ('A' <= ch && ch <= 'Z')) ) | |
76 | return -1; | |
77 | } | |
78 | return 0; | |
79 | } | |
80 | ||
81 | static struct git_attr *git_attr_internal(const char *name, int len) | |
82 | { | |
83 | unsigned hval = hash_name(name, len); | |
84 | unsigned pos = hval % HASHSIZE; | |
85 | struct git_attr *a; | |
86 | ||
87 | for (a = git_attr_hash[pos]; a; a = a->next) { | |
88 | if (a->h == hval && | |
89 | !memcmp(a->name, name, len) && !a->name[len]) | |
90 | return a; | |
91 | } | |
92 | ||
93 | if (invalid_attr_name(name, len)) | |
94 | return NULL; | |
95 | ||
96 | FLEX_ALLOC_MEM(a, name, name, len); | |
97 | a->h = hval; | |
98 | a->next = git_attr_hash[pos]; | |
99 | a->attr_nr = attr_nr++; | |
100 | a->maybe_macro = 0; | |
101 | a->maybe_real = 0; | |
102 | git_attr_hash[pos] = a; | |
103 | ||
104 | REALLOC_ARRAY(check_all_attr, attr_nr); | |
105 | check_all_attr[a->attr_nr].attr = a; | |
106 | check_all_attr[a->attr_nr].value = ATTR__UNKNOWN; | |
107 | return a; | |
108 | } | |
109 | ||
110 | struct git_attr *git_attr(const char *name) | |
111 | { | |
112 | return git_attr_internal(name, strlen(name)); | |
113 | } | |
114 | ||
115 | /* What does a matched pattern decide? */ | |
116 | struct attr_state { | |
117 | struct git_attr *attr; | |
118 | const char *setto; | |
119 | }; | |
120 | ||
121 | struct pattern { | |
122 | const char *pattern; | |
123 | int patternlen; | |
124 | int nowildcardlen; | |
125 | unsigned flags; /* EXC_FLAG_* */ | |
126 | }; | |
127 | ||
128 | /* | |
129 | * One rule, as from a .gitattributes file. | |
130 | * | |
131 | * If is_macro is true, then u.attr is a pointer to the git_attr being | |
132 | * defined. | |
133 | * | |
134 | * If is_macro is false, then u.pat is the filename pattern to which the | |
135 | * rule applies. | |
136 | * | |
137 | * In either case, num_attr is the number of attributes affected by | |
138 | * this rule, and state is an array listing them. The attributes are | |
139 | * listed as they appear in the file (macros unexpanded). | |
140 | */ | |
141 | struct match_attr { | |
142 | union { | |
143 | struct pattern pat; | |
144 | struct git_attr *attr; | |
145 | } u; | |
146 | char is_macro; | |
147 | unsigned num_attr; | |
148 | struct attr_state state[FLEX_ARRAY]; | |
149 | }; | |
150 | ||
151 | static const char blank[] = " \t\r\n"; | |
152 | ||
153 | /* | |
154 | * Parse a whitespace-delimited attribute state (i.e., "attr", | |
155 | * "-attr", "!attr", or "attr=value") from the string starting at src. | |
156 | * If e is not NULL, write the results to *e. Return a pointer to the | |
157 | * remainder of the string (with leading whitespace removed), or NULL | |
158 | * if there was an error. | |
159 | */ | |
160 | static const char *parse_attr(const char *src, int lineno, const char *cp, | |
161 | struct attr_state *e) | |
162 | { | |
163 | const char *ep, *equals; | |
164 | int len; | |
165 | ||
166 | ep = cp + strcspn(cp, blank); | |
167 | equals = strchr(cp, '='); | |
168 | if (equals && ep < equals) | |
169 | equals = NULL; | |
170 | if (equals) | |
171 | len = equals - cp; | |
172 | else | |
173 | len = ep - cp; | |
174 | if (!e) { | |
175 | if (*cp == '-' || *cp == '!') { | |
176 | cp++; | |
177 | len--; | |
178 | } | |
179 | if (invalid_attr_name(cp, len)) { | |
180 | fprintf(stderr, | |
181 | "%.*s is not a valid attribute name: %s:%d\n", | |
182 | len, cp, src, lineno); | |
183 | return NULL; | |
184 | } | |
185 | } else { | |
186 | /* | |
187 | * As this function is always called twice, once with | |
188 | * e == NULL in the first pass and then e != NULL in | |
189 | * the second pass, no need for invalid_attr_name() | |
190 | * check here. | |
191 | */ | |
192 | if (*cp == '-' || *cp == '!') { | |
193 | e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET; | |
194 | cp++; | |
195 | len--; | |
196 | } | |
197 | else if (!equals) | |
198 | e->setto = ATTR__TRUE; | |
199 | else { | |
200 | e->setto = xmemdupz(equals + 1, ep - equals - 1); | |
201 | } | |
202 | e->attr = git_attr_internal(cp, len); | |
203 | } | |
204 | return ep + strspn(ep, blank); | |
205 | } | |
206 | ||
207 | static struct match_attr *parse_attr_line(const char *line, const char *src, | |
208 | int lineno, int macro_ok) | |
209 | { | |
210 | int namelen; | |
211 | int num_attr, i; | |
212 | const char *cp, *name, *states; | |
213 | struct match_attr *res = NULL; | |
214 | int is_macro; | |
215 | ||
216 | cp = line + strspn(line, blank); | |
217 | if (!*cp || *cp == '#') | |
218 | return NULL; | |
219 | name = cp; | |
220 | namelen = strcspn(name, blank); | |
221 | if (strlen(ATTRIBUTE_MACRO_PREFIX) < namelen && | |
222 | starts_with(name, ATTRIBUTE_MACRO_PREFIX)) { | |
223 | if (!macro_ok) { | |
224 | fprintf(stderr, "%s not allowed: %s:%d\n", | |
225 | name, src, lineno); | |
226 | return NULL; | |
227 | } | |
228 | is_macro = 1; | |
229 | name += strlen(ATTRIBUTE_MACRO_PREFIX); | |
230 | name += strspn(name, blank); | |
231 | namelen = strcspn(name, blank); | |
232 | if (invalid_attr_name(name, namelen)) { | |
233 | fprintf(stderr, | |
234 | "%.*s is not a valid attribute name: %s:%d\n", | |
235 | namelen, name, src, lineno); | |
236 | return NULL; | |
237 | } | |
238 | } | |
239 | else | |
240 | is_macro = 0; | |
241 | ||
242 | states = name + namelen; | |
243 | states += strspn(states, blank); | |
244 | ||
245 | /* First pass to count the attr_states */ | |
246 | for (cp = states, num_attr = 0; *cp; num_attr++) { | |
247 | cp = parse_attr(src, lineno, cp, NULL); | |
248 | if (!cp) | |
249 | return NULL; | |
250 | } | |
251 | ||
252 | res = xcalloc(1, | |
253 | sizeof(*res) + | |
254 | sizeof(struct attr_state) * num_attr + | |
255 | (is_macro ? 0 : namelen + 1)); | |
256 | if (is_macro) { | |
257 | res->u.attr = git_attr_internal(name, namelen); | |
258 | res->u.attr->maybe_macro = 1; | |
259 | } else { | |
260 | char *p = (char *)&(res->state[num_attr]); | |
261 | memcpy(p, name, namelen); | |
262 | res->u.pat.pattern = p; | |
263 | parse_exclude_pattern(&res->u.pat.pattern, | |
264 | &res->u.pat.patternlen, | |
265 | &res->u.pat.flags, | |
266 | &res->u.pat.nowildcardlen); | |
267 | if (res->u.pat.flags & EXC_FLAG_NEGATIVE) { | |
268 | warning(_("Negative patterns are ignored in git attributes\n" | |
269 | "Use '\\!' for literal leading exclamation.")); | |
270 | return NULL; | |
271 | } | |
272 | } | |
273 | res->is_macro = is_macro; | |
274 | res->num_attr = num_attr; | |
275 | ||
276 | /* Second pass to fill the attr_states */ | |
277 | for (cp = states, i = 0; *cp; i++) { | |
278 | cp = parse_attr(src, lineno, cp, &(res->state[i])); | |
279 | if (!is_macro) | |
280 | res->state[i].attr->maybe_real = 1; | |
281 | if (res->state[i].attr->maybe_macro) | |
282 | cannot_trust_maybe_real = 1; | |
283 | } | |
284 | ||
285 | return res; | |
286 | } | |
287 | ||
288 | /* | |
289 | * Like info/exclude and .gitignore, the attribute information can | |
290 | * come from many places. | |
291 | * | |
292 | * (1) .gitattribute file of the same directory; | |
293 | * (2) .gitattribute file of the parent directory if (1) does not have | |
294 | * any match; this goes recursively upwards, just like .gitignore. | |
295 | * (3) $GIT_DIR/info/attributes, which overrides both of the above. | |
296 | * | |
297 | * In the same file, later entries override the earlier match, so in the | |
298 | * global list, we would have entries from info/attributes the earliest | |
299 | * (reading the file from top to bottom), .gitattribute of the root | |
300 | * directory (again, reading the file from top to bottom) down to the | |
301 | * current directory, and then scan the list backwards to find the first match. | |
302 | * This is exactly the same as what is_excluded() does in dir.c to deal with | |
303 | * .gitignore file and info/excludes file as a fallback. | |
304 | */ | |
305 | ||
306 | static struct attr_stack { | |
307 | struct attr_stack *prev; | |
308 | char *origin; | |
309 | size_t originlen; | |
310 | unsigned num_matches; | |
311 | unsigned alloc; | |
312 | struct match_attr **attrs; | |
313 | } *attr_stack; | |
314 | ||
315 | static void free_attr_elem(struct attr_stack *e) | |
316 | { | |
317 | int i; | |
318 | free(e->origin); | |
319 | for (i = 0; i < e->num_matches; i++) { | |
320 | struct match_attr *a = e->attrs[i]; | |
321 | int j; | |
322 | for (j = 0; j < a->num_attr; j++) { | |
323 | const char *setto = a->state[j].setto; | |
324 | if (setto == ATTR__TRUE || | |
325 | setto == ATTR__FALSE || | |
326 | setto == ATTR__UNSET || | |
327 | setto == ATTR__UNKNOWN) | |
328 | ; | |
329 | else | |
330 | free((char *) setto); | |
331 | } | |
332 | free(a); | |
333 | } | |
334 | free(e->attrs); | |
335 | free(e); | |
336 | } | |
337 | ||
338 | static const char *builtin_attr[] = { | |
339 | "[attr]binary -diff -merge -text", | |
340 | NULL, | |
341 | }; | |
342 | ||
343 | static void handle_attr_line(struct attr_stack *res, | |
344 | const char *line, | |
345 | const char *src, | |
346 | int lineno, | |
347 | int macro_ok) | |
348 | { | |
349 | struct match_attr *a; | |
350 | ||
351 | a = parse_attr_line(line, src, lineno, macro_ok); | |
352 | if (!a) | |
353 | return; | |
354 | ALLOC_GROW(res->attrs, res->num_matches + 1, res->alloc); | |
355 | res->attrs[res->num_matches++] = a; | |
356 | } | |
357 | ||
358 | static struct attr_stack *read_attr_from_array(const char **list) | |
359 | { | |
360 | struct attr_stack *res; | |
361 | const char *line; | |
362 | int lineno = 0; | |
363 | ||
364 | res = xcalloc(1, sizeof(*res)); | |
365 | while ((line = *(list++)) != NULL) | |
366 | handle_attr_line(res, line, "[builtin]", ++lineno, 1); | |
367 | return res; | |
368 | } | |
369 | ||
370 | static enum git_attr_direction direction; | |
371 | static struct index_state *use_index; | |
372 | ||
373 | static struct attr_stack *read_attr_from_file(const char *path, int macro_ok) | |
374 | { | |
375 | FILE *fp = fopen(path, "r"); | |
376 | struct attr_stack *res; | |
377 | char buf[2048]; | |
378 | int lineno = 0; | |
379 | ||
380 | if (!fp) { | |
381 | if (errno != ENOENT && errno != ENOTDIR) | |
382 | warn_on_inaccessible(path); | |
383 | return NULL; | |
384 | } | |
385 | res = xcalloc(1, sizeof(*res)); | |
386 | while (fgets(buf, sizeof(buf), fp)) { | |
387 | char *bufp = buf; | |
388 | if (!lineno) | |
389 | skip_utf8_bom(&bufp, strlen(bufp)); | |
390 | handle_attr_line(res, bufp, path, ++lineno, macro_ok); | |
391 | } | |
392 | fclose(fp); | |
393 | return res; | |
394 | } | |
395 | ||
396 | static struct attr_stack *read_attr_from_index(const char *path, int macro_ok) | |
397 | { | |
398 | struct attr_stack *res; | |
399 | char *buf, *sp; | |
400 | int lineno = 0; | |
401 | ||
402 | buf = read_blob_data_from_index(use_index ? use_index : &the_index, path, NULL); | |
403 | if (!buf) | |
404 | return NULL; | |
405 | ||
406 | res = xcalloc(1, sizeof(*res)); | |
407 | for (sp = buf; *sp; ) { | |
408 | char *ep; | |
409 | int more; | |
410 | ||
411 | ep = strchrnul(sp, '\n'); | |
412 | more = (*ep == '\n'); | |
413 | *ep = '\0'; | |
414 | handle_attr_line(res, sp, path, ++lineno, macro_ok); | |
415 | sp = ep + more; | |
416 | } | |
417 | free(buf); | |
418 | return res; | |
419 | } | |
420 | ||
421 | static struct attr_stack *read_attr(const char *path, int macro_ok) | |
422 | { | |
423 | struct attr_stack *res; | |
424 | ||
425 | if (direction == GIT_ATTR_CHECKOUT) { | |
426 | res = read_attr_from_index(path, macro_ok); | |
427 | if (!res) | |
428 | res = read_attr_from_file(path, macro_ok); | |
429 | } | |
430 | else if (direction == GIT_ATTR_CHECKIN) { | |
431 | res = read_attr_from_file(path, macro_ok); | |
432 | if (!res) | |
433 | /* | |
434 | * There is no checked out .gitattributes file there, but | |
435 | * we might have it in the index. We allow operation in a | |
436 | * sparsely checked out work tree, so read from it. | |
437 | */ | |
438 | res = read_attr_from_index(path, macro_ok); | |
439 | } | |
440 | else | |
441 | res = read_attr_from_index(path, macro_ok); | |
442 | if (!res) | |
443 | res = xcalloc(1, sizeof(*res)); | |
444 | return res; | |
445 | } | |
446 | ||
447 | #if DEBUG_ATTR | |
448 | static void debug_info(const char *what, struct attr_stack *elem) | |
449 | { | |
450 | fprintf(stderr, "%s: %s\n", what, elem->origin ? elem->origin : "()"); | |
451 | } | |
452 | static void debug_set(const char *what, const char *match, struct git_attr *attr, const void *v) | |
453 | { | |
454 | const char *value = v; | |
455 | ||
456 | if (ATTR_TRUE(value)) | |
457 | value = "set"; | |
458 | else if (ATTR_FALSE(value)) | |
459 | value = "unset"; | |
460 | else if (ATTR_UNSET(value)) | |
461 | value = "unspecified"; | |
462 | ||
463 | fprintf(stderr, "%s: %s => %s (%s)\n", | |
464 | what, attr->name, (char *) value, match); | |
465 | } | |
466 | #define debug_push(a) debug_info("push", (a)) | |
467 | #define debug_pop(a) debug_info("pop", (a)) | |
468 | #else | |
469 | #define debug_push(a) do { ; } while (0) | |
470 | #define debug_pop(a) do { ; } while (0) | |
471 | #define debug_set(a,b,c,d) do { ; } while (0) | |
472 | #endif /* DEBUG_ATTR */ | |
473 | ||
474 | static void drop_attr_stack(void) | |
475 | { | |
476 | while (attr_stack) { | |
477 | struct attr_stack *elem = attr_stack; | |
478 | attr_stack = elem->prev; | |
479 | free_attr_elem(elem); | |
480 | } | |
481 | } | |
482 | ||
483 | static const char *git_etc_gitattributes(void) | |
484 | { | |
485 | static const char *system_wide; | |
486 | if (!system_wide) | |
487 | system_wide = system_path(ETC_GITATTRIBUTES); | |
488 | return system_wide; | |
489 | } | |
490 | ||
491 | static int git_attr_system(void) | |
492 | { | |
493 | return !git_env_bool("GIT_ATTR_NOSYSTEM", 0); | |
494 | } | |
495 | ||
496 | static GIT_PATH_FUNC(git_path_info_attributes, INFOATTRIBUTES_FILE) | |
497 | ||
498 | static void bootstrap_attr_stack(void) | |
499 | { | |
500 | struct attr_stack *elem; | |
501 | ||
502 | if (attr_stack) | |
503 | return; | |
504 | ||
505 | elem = read_attr_from_array(builtin_attr); | |
506 | elem->origin = NULL; | |
507 | elem->prev = attr_stack; | |
508 | attr_stack = elem; | |
509 | ||
510 | if (git_attr_system()) { | |
511 | elem = read_attr_from_file(git_etc_gitattributes(), 1); | |
512 | if (elem) { | |
513 | elem->origin = NULL; | |
514 | elem->prev = attr_stack; | |
515 | attr_stack = elem; | |
516 | } | |
517 | } | |
518 | ||
519 | if (!git_attributes_file) | |
520 | git_attributes_file = xdg_config_home("attributes"); | |
521 | if (git_attributes_file) { | |
522 | elem = read_attr_from_file(git_attributes_file, 1); | |
523 | if (elem) { | |
524 | elem->origin = NULL; | |
525 | elem->prev = attr_stack; | |
526 | attr_stack = elem; | |
527 | } | |
528 | } | |
529 | ||
530 | if (!is_bare_repository() || direction == GIT_ATTR_INDEX) { | |
531 | elem = read_attr(GITATTRIBUTES_FILE, 1); | |
532 | elem->origin = xstrdup(""); | |
533 | elem->originlen = 0; | |
534 | elem->prev = attr_stack; | |
535 | attr_stack = elem; | |
536 | debug_push(elem); | |
537 | } | |
538 | ||
539 | if (startup_info->have_repository) | |
540 | elem = read_attr_from_file(git_path_info_attributes(), 1); | |
541 | else | |
542 | elem = NULL; | |
543 | ||
544 | if (!elem) | |
545 | elem = xcalloc(1, sizeof(*elem)); | |
546 | elem->origin = NULL; | |
547 | elem->prev = attr_stack; | |
548 | attr_stack = elem; | |
549 | } | |
550 | ||
551 | static void prepare_attr_stack(const char *path, int dirlen) | |
552 | { | |
553 | struct attr_stack *elem, *info; | |
554 | int len; | |
555 | const char *cp; | |
556 | ||
557 | /* | |
558 | * At the bottom of the attribute stack is the built-in | |
559 | * set of attribute definitions, followed by the contents | |
560 | * of $(prefix)/etc/gitattributes and a file specified by | |
561 | * core.attributesfile. Then, contents from | |
562 | * .gitattribute files from directories closer to the | |
563 | * root to the ones in deeper directories are pushed | |
564 | * to the stack. Finally, at the very top of the stack | |
565 | * we always keep the contents of $GIT_DIR/info/attributes. | |
566 | * | |
567 | * When checking, we use entries from near the top of the | |
568 | * stack, preferring $GIT_DIR/info/attributes, then | |
569 | * .gitattributes in deeper directories to shallower ones, | |
570 | * and finally use the built-in set as the default. | |
571 | */ | |
572 | bootstrap_attr_stack(); | |
573 | ||
574 | /* | |
575 | * Pop the "info" one that is always at the top of the stack. | |
576 | */ | |
577 | info = attr_stack; | |
578 | attr_stack = info->prev; | |
579 | ||
580 | /* | |
581 | * Pop the ones from directories that are not the prefix of | |
582 | * the path we are checking. Break out of the loop when we see | |
583 | * the root one (whose origin is an empty string "") or the builtin | |
584 | * one (whose origin is NULL) without popping it. | |
585 | */ | |
586 | while (attr_stack->origin) { | |
587 | int namelen = strlen(attr_stack->origin); | |
588 | ||
589 | elem = attr_stack; | |
590 | if (namelen <= dirlen && | |
591 | !strncmp(elem->origin, path, namelen) && | |
592 | (!namelen || path[namelen] == '/')) | |
593 | break; | |
594 | ||
595 | debug_pop(elem); | |
596 | attr_stack = elem->prev; | |
597 | free_attr_elem(elem); | |
598 | } | |
599 | ||
600 | /* | |
601 | * Read from parent directories and push them down | |
602 | */ | |
603 | if (!is_bare_repository() || direction == GIT_ATTR_INDEX) { | |
604 | /* | |
605 | * bootstrap_attr_stack() should have added, and the | |
606 | * above loop should have stopped before popping, the | |
607 | * root element whose attr_stack->origin is set to an | |
608 | * empty string. | |
609 | */ | |
610 | struct strbuf pathbuf = STRBUF_INIT; | |
611 | ||
612 | assert(attr_stack->origin); | |
613 | while (1) { | |
614 | len = strlen(attr_stack->origin); | |
615 | if (dirlen <= len) | |
616 | break; | |
617 | cp = memchr(path + len + 1, '/', dirlen - len - 1); | |
618 | if (!cp) | |
619 | cp = path + dirlen; | |
620 | strbuf_add(&pathbuf, path, cp - path); | |
621 | strbuf_addch(&pathbuf, '/'); | |
622 | strbuf_addstr(&pathbuf, GITATTRIBUTES_FILE); | |
623 | elem = read_attr(pathbuf.buf, 0); | |
624 | strbuf_setlen(&pathbuf, cp - path); | |
625 | elem->origin = strbuf_detach(&pathbuf, &elem->originlen); | |
626 | elem->prev = attr_stack; | |
627 | attr_stack = elem; | |
628 | debug_push(elem); | |
629 | } | |
630 | ||
631 | strbuf_release(&pathbuf); | |
632 | } | |
633 | ||
634 | /* | |
635 | * Finally push the "info" one at the top of the stack. | |
636 | */ | |
637 | info->prev = attr_stack; | |
638 | attr_stack = info; | |
639 | } | |
640 | ||
641 | static int path_matches(const char *pathname, int pathlen, | |
642 | int basename_offset, | |
643 | const struct pattern *pat, | |
644 | const char *base, int baselen) | |
645 | { | |
646 | const char *pattern = pat->pattern; | |
647 | int prefix = pat->nowildcardlen; | |
648 | int isdir = (pathlen && pathname[pathlen - 1] == '/'); | |
649 | ||
650 | if ((pat->flags & EXC_FLAG_MUSTBEDIR) && !isdir) | |
651 | return 0; | |
652 | ||
653 | if (pat->flags & EXC_FLAG_NODIR) { | |
654 | return match_basename(pathname + basename_offset, | |
655 | pathlen - basename_offset - isdir, | |
656 | pattern, prefix, | |
657 | pat->patternlen, pat->flags); | |
658 | } | |
659 | return match_pathname(pathname, pathlen - isdir, | |
660 | base, baselen, | |
661 | pattern, prefix, pat->patternlen, pat->flags); | |
662 | } | |
663 | ||
664 | static int macroexpand_one(int attr_nr, int rem); | |
665 | ||
666 | static int fill_one(const char *what, struct match_attr *a, int rem) | |
667 | { | |
668 | struct git_attr_check *check = check_all_attr; | |
669 | int i; | |
670 | ||
671 | for (i = a->num_attr - 1; 0 < rem && 0 <= i; i--) { | |
672 | struct git_attr *attr = a->state[i].attr; | |
673 | const char **n = &(check[attr->attr_nr].value); | |
674 | const char *v = a->state[i].setto; | |
675 | ||
676 | if (*n == ATTR__UNKNOWN) { | |
677 | debug_set(what, | |
678 | a->is_macro ? a->u.attr->name : a->u.pat.pattern, | |
679 | attr, v); | |
680 | *n = v; | |
681 | rem--; | |
682 | rem = macroexpand_one(attr->attr_nr, rem); | |
683 | } | |
684 | } | |
685 | return rem; | |
686 | } | |
687 | ||
688 | static int fill(const char *path, int pathlen, int basename_offset, | |
689 | struct attr_stack *stk, int rem) | |
690 | { | |
691 | int i; | |
692 | const char *base = stk->origin ? stk->origin : ""; | |
693 | ||
694 | for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) { | |
695 | struct match_attr *a = stk->attrs[i]; | |
696 | if (a->is_macro) | |
697 | continue; | |
698 | if (path_matches(path, pathlen, basename_offset, | |
699 | &a->u.pat, base, stk->originlen)) | |
700 | rem = fill_one("fill", a, rem); | |
701 | } | |
702 | return rem; | |
703 | } | |
704 | ||
705 | static int macroexpand_one(int nr, int rem) | |
706 | { | |
707 | struct attr_stack *stk; | |
708 | int i; | |
709 | ||
710 | if (check_all_attr[nr].value != ATTR__TRUE || | |
711 | !check_all_attr[nr].attr->maybe_macro) | |
712 | return rem; | |
713 | ||
714 | for (stk = attr_stack; stk; stk = stk->prev) { | |
715 | for (i = stk->num_matches - 1; 0 <= i; i--) { | |
716 | struct match_attr *ma = stk->attrs[i]; | |
717 | if (!ma->is_macro) | |
718 | continue; | |
719 | if (ma->u.attr->attr_nr == nr) | |
720 | return fill_one("expand", ma, rem); | |
721 | } | |
722 | } | |
723 | ||
724 | return rem; | |
725 | } | |
726 | ||
727 | /* | |
728 | * Collect attributes for path into the array pointed to by | |
729 | * check_all_attr. If num is non-zero, only attributes in check[] are | |
730 | * collected. Otherwise all attributes are collected. | |
731 | */ | |
732 | static void collect_some_attrs(const char *path, int num, | |
733 | struct git_attr_check *check) | |
734 | ||
735 | { | |
736 | struct attr_stack *stk; | |
737 | int i, pathlen, rem, dirlen; | |
738 | const char *cp, *last_slash = NULL; | |
739 | int basename_offset; | |
740 | ||
741 | for (cp = path; *cp; cp++) { | |
742 | if (*cp == '/' && cp[1]) | |
743 | last_slash = cp; | |
744 | } | |
745 | pathlen = cp - path; | |
746 | if (last_slash) { | |
747 | basename_offset = last_slash + 1 - path; | |
748 | dirlen = last_slash - path; | |
749 | } else { | |
750 | basename_offset = 0; | |
751 | dirlen = 0; | |
752 | } | |
753 | ||
754 | prepare_attr_stack(path, dirlen); | |
755 | for (i = 0; i < attr_nr; i++) | |
756 | check_all_attr[i].value = ATTR__UNKNOWN; | |
757 | if (num && !cannot_trust_maybe_real) { | |
758 | rem = 0; | |
759 | for (i = 0; i < num; i++) { | |
760 | if (!check[i].attr->maybe_real) { | |
761 | struct git_attr_check *c; | |
762 | c = check_all_attr + check[i].attr->attr_nr; | |
763 | c->value = ATTR__UNSET; | |
764 | rem++; | |
765 | } | |
766 | } | |
767 | if (rem == num) | |
768 | return; | |
769 | } | |
770 | ||
771 | rem = attr_nr; | |
772 | for (stk = attr_stack; 0 < rem && stk; stk = stk->prev) | |
773 | rem = fill(path, pathlen, basename_offset, stk, rem); | |
774 | } | |
775 | ||
776 | int git_check_attr(const char *path, int num, struct git_attr_check *check) | |
777 | { | |
778 | int i; | |
779 | ||
780 | collect_some_attrs(path, num, check); | |
781 | ||
782 | for (i = 0; i < num; i++) { | |
783 | const char *value = check_all_attr[check[i].attr->attr_nr].value; | |
784 | if (value == ATTR__UNKNOWN) | |
785 | value = ATTR__UNSET; | |
786 | check[i].value = value; | |
787 | } | |
788 | ||
789 | return 0; | |
790 | } | |
791 | ||
792 | int git_all_attrs(const char *path, int *num, struct git_attr_check **check) | |
793 | { | |
794 | int i, count, j; | |
795 | ||
796 | collect_some_attrs(path, 0, NULL); | |
797 | ||
798 | /* Count the number of attributes that are set. */ | |
799 | count = 0; | |
800 | for (i = 0; i < attr_nr; i++) { | |
801 | const char *value = check_all_attr[i].value; | |
802 | if (value != ATTR__UNSET && value != ATTR__UNKNOWN) | |
803 | ++count; | |
804 | } | |
805 | *num = count; | |
806 | ALLOC_ARRAY(*check, count); | |
807 | j = 0; | |
808 | for (i = 0; i < attr_nr; i++) { | |
809 | const char *value = check_all_attr[i].value; | |
810 | if (value != ATTR__UNSET && value != ATTR__UNKNOWN) { | |
811 | (*check)[j].attr = check_all_attr[i].attr; | |
812 | (*check)[j].value = value; | |
813 | ++j; | |
814 | } | |
815 | } | |
816 | ||
817 | return 0; | |
818 | } | |
819 | ||
820 | void git_attr_set_direction(enum git_attr_direction new, struct index_state *istate) | |
821 | { | |
822 | enum git_attr_direction old = direction; | |
823 | ||
824 | if (is_bare_repository() && new != GIT_ATTR_INDEX) | |
825 | die("BUG: non-INDEX attr direction in a bare repo"); | |
826 | ||
827 | direction = new; | |
828 | if (new != old) | |
829 | drop_attr_stack(); | |
830 | use_index = istate; | |
831 | } |