4 const char git_attr__true[] = "(builtin)true";
5 const char git_attr__false[] = "\0(builtin)false";
6 static const char git_attr__unknown[] = "(builtin)unknown";
7 #define ATTR__TRUE git_attr__true
8 #define ATTR__FALSE git_attr__false
9 #define ATTR__UNSET NULL
10 #define ATTR__UNKNOWN git_attr__unknown
13 * The basic design decision here is that we are not going to have
14 * insanely large number of attributes.
16 * This is a randomly chosen prime.
25 struct git_attr *next;
28 char name[FLEX_ARRAY];
32 static struct git_attr_check *check_all_attr;
33 static struct git_attr *(git_attr_hash[HASHSIZE]);
35 static unsigned hash_name(const char *name, int namelen)
42 val = ((val << 7) | (val >> 22)) ^ c;
47 static int invalid_attr_name(const char *name, int namelen)
50 * Attribute name cannot begin with '-' and from
51 * [-A-Za-z0-9_.]. We'd specifically exclude '=' for now,
52 * as we might later want to allow non-binary value for
53 * attributes, e.g. "*.svg merge=special-merge-program-for-svg"
59 if (! (ch == '-' || ch == '.' || ch == '_' ||
60 ('0' <= ch && ch <= '9') ||
61 ('a' <= ch && ch <= 'z') ||
62 ('A' <= ch && ch <= 'Z')) )
68 struct git_attr *git_attr(const char *name, int len)
70 unsigned hval = hash_name(name, len);
71 unsigned pos = hval % HASHSIZE;
74 for (a = git_attr_hash[pos]; a; a = a->next) {
76 !memcmp(a->name, name, len) && !a->name[len])
80 if (invalid_attr_name(name, len))
83 a = xmalloc(sizeof(*a) + len + 1);
84 memcpy(a->name, name, len);
87 a->next = git_attr_hash[pos];
88 a->attr_nr = attr_nr++;
89 git_attr_hash[pos] = a;
91 check_all_attr = xrealloc(check_all_attr,
92 sizeof(*check_all_attr) * attr_nr);
93 check_all_attr[a->attr_nr].attr = a;
94 check_all_attr[a->attr_nr].value = ATTR__UNKNOWN;
99 * .gitattributes file is one line per record, each of which is
103 * (3) whitespace separated list of attribute names, each of which
104 * could be prefixed with '-' to mean "set to false", '!' to mean
108 /* What does a matched pattern decide? */
110 struct git_attr *attr;
117 struct git_attr *attr;
121 struct attr_state state[FLEX_ARRAY];
124 static const char blank[] = " \t\r\n";
126 static const char *parse_attr(const char *src, int lineno, const char *cp,
127 int *num_attr, struct match_attr *res)
129 const char *ep, *equals;
132 ep = cp + strcspn(cp, blank);
133 equals = strchr(cp, '=');
134 if (equals && ep < equals)
141 if (*cp == '-' || *cp == '!') {
145 if (invalid_attr_name(cp, len)) {
147 "%.*s is not a valid attribute name: %s:%d\n",
148 len, cp, src, lineno);
152 struct attr_state *e;
154 e = &(res->state[*num_attr]);
155 if (*cp == '-' || *cp == '!') {
156 e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET;
161 e->setto = ATTR__TRUE;
164 int vallen = ep - equals;
165 value = xmalloc(vallen);
166 memcpy(value, equals+1, vallen-1);
170 e->attr = git_attr(cp, len);
173 return ep + strspn(ep, blank);
176 static struct match_attr *parse_attr_line(const char *line, const char *src,
177 int lineno, int macro_ok)
181 const char *cp, *name;
182 struct match_attr *res = NULL;
186 cp = line + strspn(line, blank);
187 if (!*cp || *cp == '#')
190 namelen = strcspn(name, blank);
191 if (strlen(ATTRIBUTE_MACRO_PREFIX) < namelen &&
192 !prefixcmp(name, ATTRIBUTE_MACRO_PREFIX)) {
194 fprintf(stderr, "%s not allowed: %s:%d\n",
199 name += strlen(ATTRIBUTE_MACRO_PREFIX);
200 name += strspn(name, blank);
201 namelen = strcspn(name, blank);
202 if (invalid_attr_name(name, namelen)) {
204 "%.*s is not a valid attribute name: %s:%d\n",
205 namelen, name, src, lineno);
212 for (pass = 0; pass < 2; pass++) {
213 /* pass 0 counts and allocates, pass 1 fills */
216 cp = cp + strspn(cp, blank);
218 cp = parse_attr(src, lineno, cp, &num_attr, res);
226 sizeof(struct attr_state) * num_attr +
227 (is_macro ? 0 : namelen + 1));
229 res->u.attr = git_attr(name, namelen);
231 res->u.pattern = (char*)&(res->state[num_attr]);
232 memcpy(res->u.pattern, name, namelen);
233 res->u.pattern[namelen] = 0;
235 res->is_macro = is_macro;
236 res->num_attr = num_attr;
242 * Like info/exclude and .gitignore, the attribute information can
243 * come from many places.
245 * (1) .gitattribute file of the same directory;
246 * (2) .gitattribute file of the parent directory if (1) does not have
247 * any match; this goes recursively upwards, just like .gitignore.
248 * (3) $GIT_DIR/info/attributes, which overrides both of the above.
250 * In the same file, later entries override the earlier match, so in the
251 * global list, we would have entries from info/attributes the earliest
252 * (reading the file from top to bottom), .gitattribute of the root
253 * directory (again, reading the file from top to bottom) down to the
254 * current directory, and then scan the list backwards to find the first match.
255 * This is exactly the same as what excluded() does in dir.c to deal with
259 static struct attr_stack {
260 struct attr_stack *prev;
262 unsigned num_matches;
264 struct match_attr **attrs;
267 static void free_attr_elem(struct attr_stack *e)
271 for (i = 0; i < e->num_matches; i++) {
272 struct match_attr *a = e->attrs[i];
274 for (j = 0; j < a->num_attr; j++) {
275 const char *setto = a->state[j].setto;
276 if (setto == ATTR__TRUE ||
277 setto == ATTR__FALSE ||
278 setto == ATTR__UNSET ||
279 setto == ATTR__UNKNOWN)
289 static const char *builtin_attr[] = {
290 "[attr]binary -diff -crlf",
294 static void handle_attr_line(struct attr_stack *res,
300 struct match_attr *a;
302 a = parse_attr_line(line, src, lineno, macro_ok);
305 if (res->alloc <= res->num_matches) {
306 res->alloc = alloc_nr(res->num_matches);
307 res->attrs = xrealloc(res->attrs,
308 sizeof(struct match_attr *) *
311 res->attrs[res->num_matches++] = a;
314 static struct attr_stack *read_attr_from_array(const char **list)
316 struct attr_stack *res;
320 res = xcalloc(1, sizeof(*res));
321 while ((line = *(list++)) != NULL)
322 handle_attr_line(res, line, "[builtin]", ++lineno, 1);
326 static struct attr_stack *read_attr_from_file(const char *path, int macro_ok)
328 FILE *fp = fopen(path, "r");
329 struct attr_stack *res;
335 res = xcalloc(1, sizeof(*res));
336 while (fgets(buf, sizeof(buf), fp))
337 handle_attr_line(res, buf, path, ++lineno, macro_ok);
342 static void *read_index_data(const char *path)
346 enum object_type type;
350 pos = cache_name_pos(path, len);
353 * We might be in the middle of a merge, in which
354 * case we would read stage #2 (ours).
358 (pos < 0 && i < active_nr &&
359 !strcmp(active_cache[i]->name, path));
361 if (ce_stage(active_cache[i]) == 2)
366 data = read_sha1_file(active_cache[pos]->sha1, &type, &sz);
367 if (!data || type != OBJ_BLOB) {
374 static struct attr_stack *read_attr(const char *path, int macro_ok)
376 struct attr_stack *res;
380 res = read_attr_from_file(path, macro_ok);
384 res = xcalloc(1, sizeof(*res));
387 * There is no checked out .gitattributes file there, but
388 * we might have it in the index. We allow operation in a
389 * sparsely checked out work tree, so read from it.
391 buf = read_index_data(path);
395 for (sp = buf; *sp; ) {
398 for (ep = sp; *ep && *ep != '\n'; ep++)
400 more = (*ep == '\n');
402 handle_attr_line(res, sp, path, ++lineno, macro_ok);
410 static void debug_info(const char *what, struct attr_stack *elem)
412 fprintf(stderr, "%s: %s\n", what, elem->origin ? elem->origin : "()");
414 static void debug_set(const char *what, const char *match, struct git_attr *attr, void *v)
416 const char *value = v;
418 if (ATTR_TRUE(value))
420 else if (ATTR_FALSE(value))
422 else if (ATTR_UNSET(value))
423 value = "unspecified";
425 fprintf(stderr, "%s: %s => %s (%s)\n",
426 what, attr->name, (char *) value, match);
428 #define debug_push(a) debug_info("push", (a))
429 #define debug_pop(a) debug_info("pop", (a))
431 #define debug_push(a) do { ; } while (0)
432 #define debug_pop(a) do { ; } while (0)
433 #define debug_set(a,b,c,d) do { ; } while (0)
436 static void bootstrap_attr_stack(void)
439 struct attr_stack *elem;
441 elem = read_attr_from_array(builtin_attr);
443 elem->prev = attr_stack;
446 elem = read_attr(GITATTRIBUTES_FILE, 1);
447 elem->origin = strdup("");
448 elem->prev = attr_stack;
452 elem = read_attr_from_file(git_path(INFOATTRIBUTES_FILE), 1);
454 elem = xcalloc(1, sizeof(*elem));
456 elem->prev = attr_stack;
461 static void prepare_attr_stack(const char *path, int dirlen)
463 struct attr_stack *elem, *info;
465 char pathbuf[PATH_MAX];
468 * At the bottom of the attribute stack is the built-in
469 * set of attribute definitions. Then, contents from
470 * .gitattribute files from directories closer to the
471 * root to the ones in deeper directories are pushed
472 * to the stack. Finally, at the very top of the stack
473 * we always keep the contents of $GIT_DIR/info/attributes.
475 * When checking, we use entries from near the top of the
476 * stack, preferring $GIT_DIR/info/attributes, then
477 * .gitattributes in deeper directories to shallower ones,
478 * and finally use the built-in set as the default.
481 bootstrap_attr_stack();
484 * Pop the "info" one that is always at the top of the stack.
487 attr_stack = info->prev;
490 * Pop the ones from directories that are not the prefix of
491 * the path we are checking.
493 while (attr_stack && attr_stack->origin) {
494 int namelen = strlen(attr_stack->origin);
497 if (namelen <= dirlen &&
498 !strncmp(elem->origin, path, namelen))
502 attr_stack = elem->prev;
503 free_attr_elem(elem);
507 * Read from parent directories and push them down
512 len = strlen(attr_stack->origin);
515 memcpy(pathbuf, path, dirlen);
516 memcpy(pathbuf + dirlen, "/", 2);
517 cp = strchr(pathbuf + len + 1, '/');
518 strcpy(cp + 1, GITATTRIBUTES_FILE);
519 elem = read_attr(pathbuf, 0);
521 elem->origin = strdup(pathbuf);
522 elem->prev = attr_stack;
528 * Finally push the "info" one at the top of the stack.
530 info->prev = attr_stack;
534 static int path_matches(const char *pathname, int pathlen,
536 const char *base, int baselen)
538 if (!strchr(pattern, '/')) {
540 const char *basename = strrchr(pathname, '/');
541 basename = basename ? basename + 1 : pathname;
542 return (fnmatch(pattern, basename, 0) == 0);
545 * match with FNM_PATHNAME; the pattern has base implicitly
550 if (pathlen < baselen ||
551 (baselen && pathname[baselen - 1] != '/') ||
552 strncmp(pathname, base, baselen))
554 return fnmatch(pattern, pathname + baselen, FNM_PATHNAME) == 0;
557 static int fill_one(const char *what, struct match_attr *a, int rem)
559 struct git_attr_check *check = check_all_attr;
562 for (i = 0; 0 < rem && i < a->num_attr; i++) {
563 struct git_attr *attr = a->state[i].attr;
564 const char **n = &(check[attr->attr_nr].value);
565 const char *v = a->state[i].setto;
567 if (*n == ATTR__UNKNOWN) {
568 debug_set(what, a->u.pattern, attr, v);
576 static int fill(const char *path, int pathlen, struct attr_stack *stk, int rem)
579 const char *base = stk->origin ? stk->origin : "";
581 for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) {
582 struct match_attr *a = stk->attrs[i];
585 if (path_matches(path, pathlen,
586 a->u.pattern, base, strlen(base)))
587 rem = fill_one("fill", a, rem);
592 static int macroexpand(struct attr_stack *stk, int rem)
595 struct git_attr_check *check = check_all_attr;
597 for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) {
598 struct match_attr *a = stk->attrs[i];
601 if (check[a->u.attr->attr_nr].value != ATTR__TRUE)
603 rem = fill_one("expand", a, rem);
608 int git_checkattr(const char *path, int num, struct git_attr_check *check)
610 struct attr_stack *stk;
612 int dirlen, pathlen, i, rem;
614 bootstrap_attr_stack();
615 for (i = 0; i < attr_nr; i++)
616 check_all_attr[i].value = ATTR__UNKNOWN;
618 pathlen = strlen(path);
619 cp = strrchr(path, '/');
624 prepare_attr_stack(path, dirlen);
626 for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
627 rem = fill(path, pathlen, stk, rem);
629 for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
630 rem = macroexpand(stk, rem);
632 for (i = 0; i < num; i++) {
633 const char *value = check_all_attr[check[i].attr->attr_nr].value;
634 if (value == ATTR__UNKNOWN)
636 check[i].value = value;