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Commit | Line | Data |
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86ab7f0c MH |
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 | ||
06f33c17 | 10 | #define NO_THE_INDEX_COMPATIBILITY_MACROS |
d0bfd026 | 11 | #include "cache.h" |
6df42ab9 | 12 | #include "exec_cmd.h" |
d0bfd026 | 13 | #include "attr.h" |
6eba6210 | 14 | #include "dir.h" |
d0bfd026 | 15 | |
a5e92abd JH |
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 | |
515106fa | 23 | |
86ab7f0c | 24 | /* This is a randomly chosen prime. */ |
d0bfd026 JH |
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; | |
f48fd688 | 34 | int attr_nr; |
d0bfd026 JH |
35 | char name[FLEX_ARRAY]; |
36 | }; | |
f48fd688 | 37 | static int attr_nr; |
d0bfd026 | 38 | |
f48fd688 | 39 | static struct git_attr_check *check_all_attr; |
d0bfd026 JH |
40 | static struct git_attr *(git_attr_hash[HASHSIZE]); |
41 | ||
352404ac MH |
42 | char *git_attr_name(struct git_attr *attr) |
43 | { | |
44 | return attr->name; | |
45 | } | |
46 | ||
d0bfd026 JH |
47 | static unsigned hash_name(const char *name, int namelen) |
48 | { | |
48fb7deb | 49 | unsigned val = 0, c; |
d0bfd026 JH |
50 | |
51 | while (namelen--) { | |
52 | c = *name++; | |
53 | val = ((val << 7) | (val >> 22)) ^ c; | |
54 | } | |
55 | return val; | |
56 | } | |
57 | ||
e4aee10a JH |
58 | static int invalid_attr_name(const char *name, int namelen) |
59 | { | |
60 | /* | |
d42453ab MH |
61 | * Attribute name cannot begin with '-' and must consist of |
62 | * characters from [-A-Za-z0-9_.]. | |
e4aee10a | 63 | */ |
c0b13b21 | 64 | if (namelen <= 0 || *name == '-') |
e4aee10a JH |
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 | ||
7fb0eaa2 | 77 | static struct git_attr *git_attr_internal(const char *name, int len) |
d0bfd026 JH |
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 | ||
e4aee10a JH |
89 | if (invalid_attr_name(name, len)) |
90 | return NULL; | |
91 | ||
d0bfd026 JH |
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]; | |
f48fd688 | 97 | a->attr_nr = attr_nr++; |
d0bfd026 | 98 | git_attr_hash[pos] = a; |
f48fd688 JH |
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; | |
515106fa | 103 | check_all_attr[a->attr_nr].value = ATTR__UNKNOWN; |
d0bfd026 JH |
104 | return a; |
105 | } | |
106 | ||
7fb0eaa2 JH |
107 | struct git_attr *git_attr(const char *name) |
108 | { | |
109 | return git_attr_internal(name, strlen(name)); | |
110 | } | |
111 | ||
515106fa | 112 | /* What does a matched pattern decide? */ |
d0bfd026 | 113 | struct attr_state { |
d0bfd026 | 114 | struct git_attr *attr; |
a5e92abd | 115 | const char *setto; |
d0bfd026 JH |
116 | }; |
117 | ||
ba845b75 MH |
118 | /* |
119 | * One rule, as from a .gitattributes file. | |
120 | * | |
121 | * If is_macro is true, then u.attr is a pointer to the git_attr being | |
122 | * defined. | |
123 | * | |
124 | * If is_macro is false, then u.pattern points at the filename pattern | |
125 | * to which the rule applies. (The memory pointed to is part of the | |
126 | * memory block allocated for the match_attr instance.) | |
127 | * | |
128 | * In either case, num_attr is the number of attributes affected by | |
129 | * this rule, and state is an array listing them. The attributes are | |
130 | * listed as they appear in the file (macros unexpanded). | |
131 | */ | |
d0bfd026 | 132 | struct match_attr { |
f48fd688 JH |
133 | union { |
134 | char *pattern; | |
135 | struct git_attr *attr; | |
136 | } u; | |
137 | char is_macro; | |
d0bfd026 JH |
138 | unsigned num_attr; |
139 | struct attr_state state[FLEX_ARRAY]; | |
140 | }; | |
141 | ||
142 | static const char blank[] = " \t\r\n"; | |
143 | ||
d1751298 MH |
144 | /* |
145 | * Parse a whitespace-delimited attribute state (i.e., "attr", | |
146 | * "-attr", "!attr", or "attr=value") from the string starting at src. | |
147 | * If e is not NULL, write the results to *e. Return a pointer to the | |
148 | * remainder of the string (with leading whitespace removed), or NULL | |
149 | * if there was an error. | |
150 | */ | |
515106fa | 151 | static const char *parse_attr(const char *src, int lineno, const char *cp, |
d1751298 | 152 | struct attr_state *e) |
515106fa JH |
153 | { |
154 | const char *ep, *equals; | |
155 | int len; | |
156 | ||
157 | ep = cp + strcspn(cp, blank); | |
158 | equals = strchr(cp, '='); | |
159 | if (equals && ep < equals) | |
160 | equals = NULL; | |
161 | if (equals) | |
162 | len = equals - cp; | |
163 | else | |
164 | len = ep - cp; | |
d1751298 | 165 | if (!e) { |
515106fa JH |
166 | if (*cp == '-' || *cp == '!') { |
167 | cp++; | |
168 | len--; | |
169 | } | |
170 | if (invalid_attr_name(cp, len)) { | |
171 | fprintf(stderr, | |
172 | "%.*s is not a valid attribute name: %s:%d\n", | |
173 | len, cp, src, lineno); | |
174 | return NULL; | |
175 | } | |
176 | } else { | |
515106fa JH |
177 | if (*cp == '-' || *cp == '!') { |
178 | e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET; | |
179 | cp++; | |
180 | len--; | |
181 | } | |
182 | else if (!equals) | |
183 | e->setto = ATTR__TRUE; | |
184 | else { | |
182af834 | 185 | e->setto = xmemdupz(equals + 1, ep - equals - 1); |
515106fa | 186 | } |
7fb0eaa2 | 187 | e->attr = git_attr_internal(cp, len); |
515106fa | 188 | } |
515106fa JH |
189 | return ep + strspn(ep, blank); |
190 | } | |
191 | ||
f48fd688 JH |
192 | static struct match_attr *parse_attr_line(const char *line, const char *src, |
193 | int lineno, int macro_ok) | |
d0bfd026 JH |
194 | { |
195 | int namelen; | |
d68e1c18 | 196 | int num_attr, i; |
85c4a0d0 | 197 | const char *cp, *name, *states; |
515106fa | 198 | struct match_attr *res = NULL; |
f48fd688 | 199 | int is_macro; |
d0bfd026 JH |
200 | |
201 | cp = line + strspn(line, blank); | |
202 | if (!*cp || *cp == '#') | |
203 | return NULL; | |
204 | name = cp; | |
205 | namelen = strcspn(name, blank); | |
f48fd688 JH |
206 | if (strlen(ATTRIBUTE_MACRO_PREFIX) < namelen && |
207 | !prefixcmp(name, ATTRIBUTE_MACRO_PREFIX)) { | |
208 | if (!macro_ok) { | |
209 | fprintf(stderr, "%s not allowed: %s:%d\n", | |
210 | name, src, lineno); | |
211 | return NULL; | |
212 | } | |
213 | is_macro = 1; | |
214 | name += strlen(ATTRIBUTE_MACRO_PREFIX); | |
215 | name += strspn(name, blank); | |
216 | namelen = strcspn(name, blank); | |
e4aee10a JH |
217 | if (invalid_attr_name(name, namelen)) { |
218 | fprintf(stderr, | |
219 | "%.*s is not a valid attribute name: %s:%d\n", | |
220 | namelen, name, src, lineno); | |
221 | return NULL; | |
222 | } | |
f48fd688 JH |
223 | } |
224 | else | |
225 | is_macro = 0; | |
d0bfd026 | 226 | |
85c4a0d0 MH |
227 | states = name + namelen; |
228 | states += strspn(states, blank); | |
229 | ||
d68e1c18 MH |
230 | /* First pass to count the attr_states */ |
231 | for (cp = states, num_attr = 0; *cp; num_attr++) { | |
232 | cp = parse_attr(src, lineno, cp, NULL); | |
233 | if (!cp) | |
234 | return NULL; | |
d0bfd026 | 235 | } |
d68e1c18 MH |
236 | |
237 | res = xcalloc(1, | |
238 | sizeof(*res) + | |
239 | sizeof(struct attr_state) * num_attr + | |
240 | (is_macro ? 0 : namelen + 1)); | |
241 | if (is_macro) | |
242 | res->u.attr = git_attr_internal(name, namelen); | |
243 | else { | |
244 | res->u.pattern = (char *)&(res->state[num_attr]); | |
245 | memcpy(res->u.pattern, name, namelen); | |
246 | res->u.pattern[namelen] = 0; | |
d0bfd026 | 247 | } |
d68e1c18 MH |
248 | res->is_macro = is_macro; |
249 | res->num_attr = num_attr; | |
250 | ||
251 | /* Second pass to fill the attr_states */ | |
252 | for (cp = states, i = 0; *cp; i++) { | |
253 | cp = parse_attr(src, lineno, cp, &(res->state[i])); | |
254 | } | |
255 | ||
d0bfd026 JH |
256 | return res; |
257 | } | |
258 | ||
259 | /* | |
260 | * Like info/exclude and .gitignore, the attribute information can | |
261 | * come from many places. | |
262 | * | |
263 | * (1) .gitattribute file of the same directory; | |
515106fa JH |
264 | * (2) .gitattribute file of the parent directory if (1) does not have |
265 | * any match; this goes recursively upwards, just like .gitignore. | |
266 | * (3) $GIT_DIR/info/attributes, which overrides both of the above. | |
d0bfd026 JH |
267 | * |
268 | * In the same file, later entries override the earlier match, so in the | |
269 | * global list, we would have entries from info/attributes the earliest | |
270 | * (reading the file from top to bottom), .gitattribute of the root | |
271 | * directory (again, reading the file from top to bottom) down to the | |
272 | * current directory, and then scan the list backwards to find the first match. | |
273 | * This is exactly the same as what excluded() does in dir.c to deal with | |
274 | * .gitignore | |
275 | */ | |
276 | ||
277 | static struct attr_stack { | |
278 | struct attr_stack *prev; | |
279 | char *origin; | |
cd6a0b26 | 280 | size_t originlen; |
d0bfd026 | 281 | unsigned num_matches; |
a4413118 | 282 | unsigned alloc; |
d0bfd026 JH |
283 | struct match_attr **attrs; |
284 | } *attr_stack; | |
285 | ||
286 | static void free_attr_elem(struct attr_stack *e) | |
287 | { | |
288 | int i; | |
289 | free(e->origin); | |
515106fa JH |
290 | for (i = 0; i < e->num_matches; i++) { |
291 | struct match_attr *a = e->attrs[i]; | |
292 | int j; | |
293 | for (j = 0; j < a->num_attr; j++) { | |
a5e92abd | 294 | const char *setto = a->state[j].setto; |
515106fa JH |
295 | if (setto == ATTR__TRUE || |
296 | setto == ATTR__FALSE || | |
297 | setto == ATTR__UNSET || | |
298 | setto == ATTR__UNKNOWN) | |
299 | ; | |
300 | else | |
4b25d091 | 301 | free((char *) setto); |
515106fa JH |
302 | } |
303 | free(a); | |
304 | } | |
37475f97 | 305 | free(e->attrs); |
d0bfd026 JH |
306 | free(e); |
307 | } | |
308 | ||
309 | static const char *builtin_attr[] = { | |
5ec3e670 | 310 | "[attr]binary -diff -text", |
d0bfd026 JH |
311 | NULL, |
312 | }; | |
313 | ||
a4413118 JH |
314 | static void handle_attr_line(struct attr_stack *res, |
315 | const char *line, | |
316 | const char *src, | |
317 | int lineno, | |
318 | int macro_ok) | |
319 | { | |
320 | struct match_attr *a; | |
321 | ||
322 | a = parse_attr_line(line, src, lineno, macro_ok); | |
323 | if (!a) | |
324 | return; | |
325 | if (res->alloc <= res->num_matches) { | |
326 | res->alloc = alloc_nr(res->num_matches); | |
327 | res->attrs = xrealloc(res->attrs, | |
328 | sizeof(struct match_attr *) * | |
329 | res->alloc); | |
330 | } | |
331 | res->attrs[res->num_matches++] = a; | |
332 | } | |
333 | ||
d0bfd026 JH |
334 | static struct attr_stack *read_attr_from_array(const char **list) |
335 | { | |
336 | struct attr_stack *res; | |
337 | const char *line; | |
f48fd688 | 338 | int lineno = 0; |
d0bfd026 JH |
339 | |
340 | res = xcalloc(1, sizeof(*res)); | |
a4413118 JH |
341 | while ((line = *(list++)) != NULL) |
342 | handle_attr_line(res, line, "[builtin]", ++lineno, 1); | |
d0bfd026 JH |
343 | return res; |
344 | } | |
345 | ||
06f33c17 JH |
346 | static enum git_attr_direction direction; |
347 | static struct index_state *use_index; | |
348 | ||
f48fd688 | 349 | static struct attr_stack *read_attr_from_file(const char *path, int macro_ok) |
d0bfd026 | 350 | { |
a4413118 | 351 | FILE *fp = fopen(path, "r"); |
d0bfd026 JH |
352 | struct attr_stack *res; |
353 | char buf[2048]; | |
f48fd688 | 354 | int lineno = 0; |
d0bfd026 | 355 | |
d0bfd026 | 356 | if (!fp) |
a4413118 JH |
357 | return NULL; |
358 | res = xcalloc(1, sizeof(*res)); | |
359 | while (fgets(buf, sizeof(buf), fp)) | |
360 | handle_attr_line(res, buf, path, ++lineno, macro_ok); | |
361 | fclose(fp); | |
362 | return res; | |
363 | } | |
d0bfd026 | 364 | |
1a9d7e9b JH |
365 | static void *read_index_data(const char *path) |
366 | { | |
367 | int pos, len; | |
368 | unsigned long sz; | |
369 | enum object_type type; | |
370 | void *data; | |
06f33c17 | 371 | struct index_state *istate = use_index ? use_index : &the_index; |
1a9d7e9b JH |
372 | |
373 | len = strlen(path); | |
06f33c17 | 374 | pos = index_name_pos(istate, path, len); |
1a9d7e9b JH |
375 | if (pos < 0) { |
376 | /* | |
377 | * We might be in the middle of a merge, in which | |
378 | * case we would read stage #2 (ours). | |
379 | */ | |
380 | int i; | |
381 | for (i = -pos - 1; | |
06f33c17 JH |
382 | (pos < 0 && i < istate->cache_nr && |
383 | !strcmp(istate->cache[i]->name, path)); | |
1a9d7e9b | 384 | i++) |
06f33c17 | 385 | if (ce_stage(istate->cache[i]) == 2) |
1a9d7e9b JH |
386 | pos = i; |
387 | } | |
388 | if (pos < 0) | |
389 | return NULL; | |
06f33c17 | 390 | data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz); |
1a9d7e9b JH |
391 | if (!data || type != OBJ_BLOB) { |
392 | free(data); | |
393 | return NULL; | |
394 | } | |
395 | return data; | |
396 | } | |
397 | ||
06f33c17 | 398 | static struct attr_stack *read_attr_from_index(const char *path, int macro_ok) |
a4413118 JH |
399 | { |
400 | struct attr_stack *res; | |
1a9d7e9b JH |
401 | char *buf, *sp; |
402 | int lineno = 0; | |
f48fd688 | 403 | |
1a9d7e9b JH |
404 | buf = read_index_data(path); |
405 | if (!buf) | |
06f33c17 | 406 | return NULL; |
1a9d7e9b | 407 | |
06f33c17 | 408 | res = xcalloc(1, sizeof(*res)); |
1a9d7e9b JH |
409 | for (sp = buf; *sp; ) { |
410 | char *ep; | |
411 | int more; | |
412 | for (ep = sp; *ep && *ep != '\n'; ep++) | |
413 | ; | |
414 | more = (*ep == '\n'); | |
415 | *ep = '\0'; | |
416 | handle_attr_line(res, sp, path, ++lineno, macro_ok); | |
417 | sp = ep + more; | |
418 | } | |
419 | free(buf); | |
d0bfd026 JH |
420 | return res; |
421 | } | |
422 | ||
06f33c17 JH |
423 | static struct attr_stack *read_attr(const char *path, int macro_ok) |
424 | { | |
425 | struct attr_stack *res; | |
426 | ||
427 | if (direction == GIT_ATTR_CHECKOUT) { | |
428 | res = read_attr_from_index(path, macro_ok); | |
429 | if (!res) | |
430 | res = read_attr_from_file(path, macro_ok); | |
431 | } | |
4191e80a | 432 | else if (direction == GIT_ATTR_CHECKIN) { |
06f33c17 JH |
433 | res = read_attr_from_file(path, macro_ok); |
434 | if (!res) | |
435 | /* | |
436 | * There is no checked out .gitattributes file there, but | |
437 | * we might have it in the index. We allow operation in a | |
438 | * sparsely checked out work tree, so read from it. | |
439 | */ | |
440 | res = read_attr_from_index(path, macro_ok); | |
441 | } | |
4191e80a NTND |
442 | else |
443 | res = read_attr_from_index(path, macro_ok); | |
06f33c17 JH |
444 | if (!res) |
445 | res = xcalloc(1, sizeof(*res)); | |
446 | return res; | |
447 | } | |
448 | ||
d0bfd026 JH |
449 | #if DEBUG_ATTR |
450 | static void debug_info(const char *what, struct attr_stack *elem) | |
451 | { | |
452 | fprintf(stderr, "%s: %s\n", what, elem->origin ? elem->origin : "()"); | |
453 | } | |
cf94ccda | 454 | static void debug_set(const char *what, const char *match, struct git_attr *attr, const void *v) |
f48fd688 | 455 | { |
515106fa JH |
456 | const char *value = v; |
457 | ||
458 | if (ATTR_TRUE(value)) | |
459 | value = "set"; | |
460 | else if (ATTR_FALSE(value)) | |
461 | value = "unset"; | |
462 | else if (ATTR_UNSET(value)) | |
463 | value = "unspecified"; | |
464 | ||
465 | fprintf(stderr, "%s: %s => %s (%s)\n", | |
466 | what, attr->name, (char *) value, match); | |
f48fd688 | 467 | } |
d0bfd026 JH |
468 | #define debug_push(a) debug_info("push", (a)) |
469 | #define debug_pop(a) debug_info("pop", (a)) | |
470 | #else | |
471 | #define debug_push(a) do { ; } while (0) | |
472 | #define debug_pop(a) do { ; } while (0) | |
f48fd688 | 473 | #define debug_set(a,b,c,d) do { ; } while (0) |
d0bfd026 JH |
474 | #endif |
475 | ||
06f33c17 JH |
476 | static void drop_attr_stack(void) |
477 | { | |
478 | while (attr_stack) { | |
479 | struct attr_stack *elem = attr_stack; | |
480 | attr_stack = elem->prev; | |
481 | free_attr_elem(elem); | |
482 | } | |
483 | } | |
484 | ||
c5147722 | 485 | static const char *git_etc_gitattributes(void) |
6df42ab9 PO |
486 | { |
487 | static const char *system_wide; | |
488 | if (!system_wide) | |
489 | system_wide = system_path(ETC_GITATTRIBUTES); | |
490 | return system_wide; | |
491 | } | |
492 | ||
c5147722 | 493 | static int git_attr_system(void) |
6df42ab9 PO |
494 | { |
495 | return !git_env_bool("GIT_ATTR_NOSYSTEM", 0); | |
496 | } | |
497 | ||
f48fd688 JH |
498 | static void bootstrap_attr_stack(void) |
499 | { | |
909ca7b9 | 500 | struct attr_stack *elem; |
f48fd688 | 501 | |
909ca7b9 JH |
502 | if (attr_stack) |
503 | return; | |
f48fd688 | 504 | |
909ca7b9 JH |
505 | elem = read_attr_from_array(builtin_attr); |
506 | elem->origin = NULL; | |
507 | elem->prev = attr_stack; | |
508 | attr_stack = elem; | |
6df42ab9 | 509 | |
909ca7b9 JH |
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; | |
6df42ab9 | 516 | } |
909ca7b9 | 517 | } |
6df42ab9 | 518 | |
6c65b5ea JH |
519 | if (git_attributes_file) { |
520 | elem = read_attr_from_file(git_attributes_file, 1); | |
909ca7b9 JH |
521 | if (elem) { |
522 | elem->origin = NULL; | |
2d35d556 RS |
523 | elem->prev = attr_stack; |
524 | attr_stack = elem; | |
2d35d556 | 525 | } |
909ca7b9 | 526 | } |
f48fd688 | 527 | |
909ca7b9 JH |
528 | if (!is_bare_repository() || direction == GIT_ATTR_INDEX) { |
529 | elem = read_attr(GITATTRIBUTES_FILE, 1); | |
6c65b5ea | 530 | elem->origin = xstrdup(""); |
cd6a0b26 | 531 | elem->originlen = 0; |
f48fd688 JH |
532 | elem->prev = attr_stack; |
533 | attr_stack = elem; | |
909ca7b9 | 534 | debug_push(elem); |
f48fd688 | 535 | } |
909ca7b9 JH |
536 | |
537 | elem = read_attr_from_file(git_path(INFOATTRIBUTES_FILE), 1); | |
538 | if (!elem) | |
539 | elem = xcalloc(1, sizeof(*elem)); | |
540 | elem->origin = NULL; | |
541 | elem->prev = attr_stack; | |
542 | attr_stack = elem; | |
f48fd688 JH |
543 | } |
544 | ||
a8727017 | 545 | static void prepare_attr_stack(const char *path) |
d0bfd026 JH |
546 | { |
547 | struct attr_stack *elem, *info; | |
a8727017 | 548 | int dirlen, len; |
a8727017 MH |
549 | const char *cp; |
550 | ||
551 | cp = strrchr(path, '/'); | |
552 | if (!cp) | |
553 | dirlen = 0; | |
554 | else | |
555 | dirlen = cp - path; | |
f66cf96d | 556 | |
d0bfd026 JH |
557 | /* |
558 | * At the bottom of the attribute stack is the built-in | |
6df42ab9 PO |
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 | |
d0bfd026 JH |
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 | */ | |
7373eab4 | 572 | bootstrap_attr_stack(); |
d0bfd026 JH |
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 | |
c432ef99 JH |
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. | |
d0bfd026 | 585 | */ |
77f7f822 | 586 | while (attr_stack->origin) { |
d0bfd026 JH |
587 | int namelen = strlen(attr_stack->origin); |
588 | ||
589 | elem = attr_stack; | |
590 | if (namelen <= dirlen && | |
1afca444 JK |
591 | !strncmp(elem->origin, path, namelen) && |
592 | (!namelen || path[namelen] == '/')) | |
d0bfd026 JH |
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 | */ | |
4191e80a | 603 | if (!is_bare_repository() || direction == GIT_ATTR_INDEX) { |
c432ef99 JH |
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 | */ | |
97410b27 | 610 | struct strbuf pathbuf = STRBUF_INIT; |
2d35d556 | 611 | |
c432ef99 | 612 | assert(attr_stack->origin); |
97410b27 | 613 | while (1) { |
2d35d556 RS |
614 | len = strlen(attr_stack->origin); |
615 | if (dirlen <= len) | |
616 | break; | |
97410b27 BC |
617 | cp = memchr(path + len + 1, '/', dirlen - len - 1); |
618 | if (!cp) | |
619 | cp = path + dirlen; | |
620 | strbuf_add(&pathbuf, path, cp - path); | |
f66cf96d | 621 | strbuf_addch(&pathbuf, '/'); |
97410b27 | 622 | strbuf_addstr(&pathbuf, GITATTRIBUTES_FILE); |
f66cf96d | 623 | elem = read_attr(pathbuf.buf, 0); |
97410b27 | 624 | strbuf_setlen(&pathbuf, cp - path); |
cd6a0b26 | 625 | elem->origin = strbuf_detach(&pathbuf, &elem->originlen); |
2d35d556 RS |
626 | elem->prev = attr_stack; |
627 | attr_stack = elem; | |
628 | debug_push(elem); | |
629 | } | |
d0bfd026 | 630 | |
97410b27 BC |
631 | strbuf_release(&pathbuf); |
632 | } | |
d4c98565 | 633 | |
d0bfd026 JH |
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, | |
4742d136 | 642 | const char *basename, |
d0bfd026 JH |
643 | const char *pattern, |
644 | const char *base, int baselen) | |
645 | { | |
646 | if (!strchr(pattern, '/')) { | |
6eba6210 | 647 | return (fnmatch_icase(pattern, basename, 0) == 0); |
d0bfd026 JH |
648 | } |
649 | /* | |
650 | * match with FNM_PATHNAME; the pattern has base implicitly | |
651 | * in front of it. | |
652 | */ | |
653 | if (*pattern == '/') | |
654 | pattern++; | |
655 | if (pathlen < baselen || | |
cf94ccda | 656 | (baselen && pathname[baselen] != '/') || |
d0bfd026 JH |
657 | strncmp(pathname, base, baselen)) |
658 | return 0; | |
82881b38 MO |
659 | if (baselen != 0) |
660 | baselen++; | |
6eba6210 | 661 | return fnmatch_icase(pattern, pathname + baselen, FNM_PATHNAME) == 0; |
d0bfd026 JH |
662 | } |
663 | ||
ec775c41 HG |
664 | static int macroexpand_one(int attr_nr, int rem); |
665 | ||
515106fa JH |
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 | ||
969f9d73 | 671 | for (i = a->num_attr - 1; 0 < rem && 0 <= i; i--) { |
515106fa | 672 | struct git_attr *attr = a->state[i].attr; |
a5e92abd JH |
673 | const char **n = &(check[attr->attr_nr].value); |
674 | const char *v = a->state[i].setto; | |
515106fa JH |
675 | |
676 | if (*n == ATTR__UNKNOWN) { | |
426c27b7 HG |
677 | debug_set(what, |
678 | a->is_macro ? a->u.attr->name : a->u.pattern, | |
679 | attr, v); | |
515106fa JH |
680 | *n = v; |
681 | rem--; | |
ec775c41 | 682 | rem = macroexpand_one(attr->attr_nr, rem); |
515106fa JH |
683 | } |
684 | } | |
685 | return rem; | |
686 | } | |
687 | ||
4742d136 NTND |
688 | static int fill(const char *path, int pathlen, const char *basename, |
689 | struct attr_stack *stk, int rem) | |
d0bfd026 | 690 | { |
515106fa | 691 | int i; |
d0bfd026 JH |
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]; | |
f48fd688 JH |
696 | if (a->is_macro) |
697 | continue; | |
4742d136 | 698 | if (path_matches(path, pathlen, basename, |
cd6a0b26 | 699 | a->u.pattern, base, stk->originlen)) |
515106fa | 700 | rem = fill_one("fill", a, rem); |
d0bfd026 JH |
701 | } |
702 | return rem; | |
703 | } | |
704 | ||
ec775c41 | 705 | static int macroexpand_one(int attr_nr, int rem) |
f48fd688 | 706 | { |
ec775c41 HG |
707 | struct attr_stack *stk; |
708 | struct match_attr *a = NULL; | |
515106fa | 709 | int i; |
f48fd688 | 710 | |
ec775c41 HG |
711 | if (check_all_attr[attr_nr].value != ATTR__TRUE) |
712 | return rem; | |
713 | ||
714 | for (stk = attr_stack; !a && stk; stk = stk->prev) | |
715 | for (i = stk->num_matches - 1; !a && 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 == attr_nr) | |
720 | a = ma; | |
721 | } | |
722 | ||
723 | if (a) | |
515106fa | 724 | rem = fill_one("expand", a, rem); |
ec775c41 | 725 | |
f48fd688 JH |
726 | return rem; |
727 | } | |
728 | ||
2d721744 MH |
729 | /* |
730 | * Collect all attributes for path into the array pointed to by | |
731 | * check_all_attr. | |
732 | */ | |
733 | static void collect_all_attrs(const char *path) | |
d0bfd026 JH |
734 | { |
735 | struct attr_stack *stk; | |
2d721744 | 736 | int i, pathlen, rem; |
4742d136 | 737 | const char *basename; |
d0bfd026 | 738 | |
2d721744 | 739 | prepare_attr_stack(path); |
f48fd688 | 740 | for (i = 0; i < attr_nr; i++) |
515106fa | 741 | check_all_attr[i].value = ATTR__UNKNOWN; |
d0bfd026 | 742 | |
4742d136 NTND |
743 | basename = strrchr(path, '/'); |
744 | basename = basename ? basename + 1 : path; | |
745 | ||
d0bfd026 | 746 | pathlen = strlen(path); |
f48fd688 JH |
747 | rem = attr_nr; |
748 | for (stk = attr_stack; 0 < rem && stk; stk = stk->prev) | |
4742d136 | 749 | rem = fill(path, pathlen, basename, stk, rem); |
2d721744 MH |
750 | } |
751 | ||
d932f4eb | 752 | int git_check_attr(const char *path, int num, struct git_attr_check *check) |
2d721744 MH |
753 | { |
754 | int i; | |
755 | ||
756 | collect_all_attrs(path); | |
f48fd688 | 757 | |
515106fa | 758 | for (i = 0; i < num; i++) { |
a5e92abd | 759 | const char *value = check_all_attr[check[i].attr->attr_nr].value; |
515106fa JH |
760 | if (value == ATTR__UNKNOWN) |
761 | value = ATTR__UNSET; | |
762 | check[i].value = value; | |
763 | } | |
f48fd688 | 764 | |
d0bfd026 JH |
765 | return 0; |
766 | } | |
06f33c17 | 767 | |
ee548df3 MH |
768 | int git_all_attrs(const char *path, int *num, struct git_attr_check **check) |
769 | { | |
770 | int i, count, j; | |
771 | ||
772 | collect_all_attrs(path); | |
773 | ||
774 | /* Count the number of attributes that are set. */ | |
775 | count = 0; | |
776 | for (i = 0; i < attr_nr; i++) { | |
777 | const char *value = check_all_attr[i].value; | |
778 | if (value != ATTR__UNSET && value != ATTR__UNKNOWN) | |
779 | ++count; | |
780 | } | |
781 | *num = count; | |
782 | *check = xmalloc(sizeof(**check) * count); | |
783 | j = 0; | |
784 | for (i = 0; i < attr_nr; i++) { | |
785 | const char *value = check_all_attr[i].value; | |
786 | if (value != ATTR__UNSET && value != ATTR__UNKNOWN) { | |
787 | (*check)[j].attr = check_all_attr[i].attr; | |
788 | (*check)[j].value = value; | |
789 | ++j; | |
790 | } | |
791 | } | |
792 | ||
793 | return 0; | |
794 | } | |
795 | ||
06f33c17 JH |
796 | void git_attr_set_direction(enum git_attr_direction new, struct index_state *istate) |
797 | { | |
798 | enum git_attr_direction old = direction; | |
4191e80a NTND |
799 | |
800 | if (is_bare_repository() && new != GIT_ATTR_INDEX) | |
801 | die("BUG: non-INDEX attr direction in a bare repo"); | |
802 | ||
06f33c17 JH |
803 | direction = new; |
804 | if (new != old) | |
805 | drop_attr_stack(); | |
806 | use_index = istate; | |
807 | } |