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.
6 * One basic design decision here is that we are not going to support
7 * an insanely large number of attributes.
10 #define NO_THE_INDEX_COMPATIBILITY_MACROS
15 const char git_attr__true[] = "(builtin)true";
16 const char git_attr__false[] = "\0(builtin)false";
17 static const char git_attr__unknown[] = "(builtin)unknown";
18 #define ATTR__TRUE git_attr__true
19 #define ATTR__FALSE git_attr__false
20 #define ATTR__UNSET NULL
21 #define ATTR__UNKNOWN git_attr__unknown
23 static const char *attributes_file;
25 /* This is a randomly chosen prime. */
33 struct git_attr *next;
36 char name[FLEX_ARRAY];
40 static struct git_attr_check *check_all_attr;
41 static struct git_attr *(git_attr_hash[HASHSIZE]);
43 static unsigned hash_name(const char *name, int namelen)
49 val = ((val << 7) | (val >> 22)) ^ c;
54 static int invalid_attr_name(const char *name, int namelen)
57 * Attribute name cannot begin with '-' and from
58 * [-A-Za-z0-9_.]. We'd specifically exclude '=' for now,
59 * as we might later want to allow non-binary value for
60 * attributes, e.g. "*.svg merge=special-merge-program-for-svg"
66 if (! (ch == '-' || ch == '.' || ch == '_' ||
67 ('0' <= ch && ch <= '9') ||
68 ('a' <= ch && ch <= 'z') ||
69 ('A' <= ch && ch <= 'Z')) )
75 static struct git_attr *git_attr_internal(const char *name, int len)
77 unsigned hval = hash_name(name, len);
78 unsigned pos = hval % HASHSIZE;
81 for (a = git_attr_hash[pos]; a; a = a->next) {
83 !memcmp(a->name, name, len) && !a->name[len])
87 if (invalid_attr_name(name, len))
90 a = xmalloc(sizeof(*a) + len + 1);
91 memcpy(a->name, name, len);
94 a->next = git_attr_hash[pos];
95 a->attr_nr = attr_nr++;
96 git_attr_hash[pos] = a;
98 check_all_attr = xrealloc(check_all_attr,
99 sizeof(*check_all_attr) * attr_nr);
100 check_all_attr[a->attr_nr].attr = a;
101 check_all_attr[a->attr_nr].value = ATTR__UNKNOWN;
105 struct git_attr *git_attr(const char *name)
107 return git_attr_internal(name, strlen(name));
110 /* What does a matched pattern decide? */
112 struct git_attr *attr;
119 struct git_attr *attr;
123 struct attr_state state[FLEX_ARRAY];
126 static const char blank[] = " \t\r\n";
128 static const char *parse_attr(const char *src, int lineno, const char *cp,
129 int *num_attr, struct match_attr *res)
131 const char *ep, *equals;
134 ep = cp + strcspn(cp, blank);
135 equals = strchr(cp, '=');
136 if (equals && ep < equals)
143 if (*cp == '-' || *cp == '!') {
147 if (invalid_attr_name(cp, len)) {
149 "%.*s is not a valid attribute name: %s:%d\n",
150 len, cp, src, lineno);
154 struct attr_state *e;
156 e = &(res->state[*num_attr]);
157 if (*cp == '-' || *cp == '!') {
158 e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET;
163 e->setto = ATTR__TRUE;
165 e->setto = xmemdupz(equals + 1, ep - equals - 1);
167 e->attr = git_attr_internal(cp, len);
170 return ep + strspn(ep, blank);
173 static struct match_attr *parse_attr_line(const char *line, const char *src,
174 int lineno, int macro_ok)
178 const char *cp, *name;
179 struct match_attr *res = NULL;
183 cp = line + strspn(line, blank);
184 if (!*cp || *cp == '#')
187 namelen = strcspn(name, blank);
188 if (strlen(ATTRIBUTE_MACRO_PREFIX) < namelen &&
189 !prefixcmp(name, ATTRIBUTE_MACRO_PREFIX)) {
191 fprintf(stderr, "%s not allowed: %s:%d\n",
196 name += strlen(ATTRIBUTE_MACRO_PREFIX);
197 name += strspn(name, blank);
198 namelen = strcspn(name, blank);
199 if (invalid_attr_name(name, namelen)) {
201 "%.*s is not a valid attribute name: %s:%d\n",
202 namelen, name, src, lineno);
209 for (pass = 0; pass < 2; pass++) {
210 /* pass 0 counts and allocates, pass 1 fills */
213 cp = cp + strspn(cp, blank);
215 cp = parse_attr(src, lineno, cp, &num_attr, res);
223 sizeof(struct attr_state) * num_attr +
224 (is_macro ? 0 : namelen + 1));
226 res->u.attr = git_attr_internal(name, namelen);
228 res->u.pattern = (char *)&(res->state[num_attr]);
229 memcpy(res->u.pattern, name, namelen);
230 res->u.pattern[namelen] = 0;
232 res->is_macro = is_macro;
233 res->num_attr = num_attr;
239 * Like info/exclude and .gitignore, the attribute information can
240 * come from many places.
242 * (1) .gitattribute file of the same directory;
243 * (2) .gitattribute file of the parent directory if (1) does not have
244 * any match; this goes recursively upwards, just like .gitignore.
245 * (3) $GIT_DIR/info/attributes, which overrides both of the above.
247 * In the same file, later entries override the earlier match, so in the
248 * global list, we would have entries from info/attributes the earliest
249 * (reading the file from top to bottom), .gitattribute of the root
250 * directory (again, reading the file from top to bottom) down to the
251 * current directory, and then scan the list backwards to find the first match.
252 * This is exactly the same as what excluded() does in dir.c to deal with
256 static struct attr_stack {
257 struct attr_stack *prev;
259 unsigned num_matches;
261 struct match_attr **attrs;
264 static void free_attr_elem(struct attr_stack *e)
268 for (i = 0; i < e->num_matches; i++) {
269 struct match_attr *a = e->attrs[i];
271 for (j = 0; j < a->num_attr; j++) {
272 const char *setto = a->state[j].setto;
273 if (setto == ATTR__TRUE ||
274 setto == ATTR__FALSE ||
275 setto == ATTR__UNSET ||
276 setto == ATTR__UNKNOWN)
279 free((char *) setto);
286 static const char *builtin_attr[] = {
287 "[attr]binary -diff -text",
291 static void handle_attr_line(struct attr_stack *res,
297 struct match_attr *a;
299 a = parse_attr_line(line, src, lineno, macro_ok);
302 if (res->alloc <= res->num_matches) {
303 res->alloc = alloc_nr(res->num_matches);
304 res->attrs = xrealloc(res->attrs,
305 sizeof(struct match_attr *) *
308 res->attrs[res->num_matches++] = a;
311 static struct attr_stack *read_attr_from_array(const char **list)
313 struct attr_stack *res;
317 res = xcalloc(1, sizeof(*res));
318 while ((line = *(list++)) != NULL)
319 handle_attr_line(res, line, "[builtin]", ++lineno, 1);
323 static enum git_attr_direction direction;
324 static struct index_state *use_index;
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;
348 struct index_state *istate = use_index ? use_index : &the_index;
351 pos = index_name_pos(istate, path, len);
354 * We might be in the middle of a merge, in which
355 * case we would read stage #2 (ours).
359 (pos < 0 && i < istate->cache_nr &&
360 !strcmp(istate->cache[i]->name, path));
362 if (ce_stage(istate->cache[i]) == 2)
367 data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz);
368 if (!data || type != OBJ_BLOB) {
375 static struct attr_stack *read_attr_from_index(const char *path, int macro_ok)
377 struct attr_stack *res;
381 buf = read_index_data(path);
385 res = xcalloc(1, sizeof(*res));
386 for (sp = buf; *sp; ) {
389 for (ep = sp; *ep && *ep != '\n'; ep++)
391 more = (*ep == '\n');
393 handle_attr_line(res, sp, path, ++lineno, macro_ok);
400 static struct attr_stack *read_attr(const char *path, int macro_ok)
402 struct attr_stack *res;
404 if (direction == GIT_ATTR_CHECKOUT) {
405 res = read_attr_from_index(path, macro_ok);
407 res = read_attr_from_file(path, macro_ok);
409 else if (direction == GIT_ATTR_CHECKIN) {
410 res = read_attr_from_file(path, macro_ok);
413 * There is no checked out .gitattributes file there, but
414 * we might have it in the index. We allow operation in a
415 * sparsely checked out work tree, so read from it.
417 res = read_attr_from_index(path, macro_ok);
420 res = read_attr_from_index(path, macro_ok);
422 res = xcalloc(1, sizeof(*res));
427 static void debug_info(const char *what, struct attr_stack *elem)
429 fprintf(stderr, "%s: %s\n", what, elem->origin ? elem->origin : "()");
431 static void debug_set(const char *what, const char *match, struct git_attr *attr, const void *v)
433 const char *value = v;
435 if (ATTR_TRUE(value))
437 else if (ATTR_FALSE(value))
439 else if (ATTR_UNSET(value))
440 value = "unspecified";
442 fprintf(stderr, "%s: %s => %s (%s)\n",
443 what, attr->name, (char *) value, match);
445 #define debug_push(a) debug_info("push", (a))
446 #define debug_pop(a) debug_info("pop", (a))
448 #define debug_push(a) do { ; } while (0)
449 #define debug_pop(a) do { ; } while (0)
450 #define debug_set(a,b,c,d) do { ; } while (0)
453 static void drop_attr_stack(void)
456 struct attr_stack *elem = attr_stack;
457 attr_stack = elem->prev;
458 free_attr_elem(elem);
462 static const char *git_etc_gitattributes(void)
464 static const char *system_wide;
466 system_wide = system_path(ETC_GITATTRIBUTES);
470 static int git_attr_system(void)
472 return !git_env_bool("GIT_ATTR_NOSYSTEM", 0);
475 static int git_attr_config(const char *var, const char *value, void *dummy)
477 if (!strcmp(var, "core.attributesfile"))
478 return git_config_pathname(&attributes_file, var, value);
483 static void bootstrap_attr_stack(void)
486 struct attr_stack *elem;
488 elem = read_attr_from_array(builtin_attr);
490 elem->prev = attr_stack;
493 if (git_attr_system()) {
494 elem = read_attr_from_file(git_etc_gitattributes(), 1);
497 elem->prev = attr_stack;
502 git_config(git_attr_config, NULL);
503 if (attributes_file) {
504 elem = read_attr_from_file(attributes_file, 1);
507 elem->prev = attr_stack;
512 if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
513 elem = read_attr(GITATTRIBUTES_FILE, 1);
514 elem->origin = strdup("");
515 elem->prev = attr_stack;
520 elem = read_attr_from_file(git_path(INFOATTRIBUTES_FILE), 1);
522 elem = xcalloc(1, sizeof(*elem));
524 elem->prev = attr_stack;
529 static void prepare_attr_stack(const char *path, int dirlen)
531 struct attr_stack *elem, *info;
533 struct strbuf pathbuf;
535 strbuf_init(&pathbuf, dirlen+2+strlen(GITATTRIBUTES_FILE));
538 * At the bottom of the attribute stack is the built-in
539 * set of attribute definitions, followed by the contents
540 * of $(prefix)/etc/gitattributes and a file specified by
541 * core.attributesfile. Then, contents from
542 * .gitattribute files from directories closer to the
543 * root to the ones in deeper directories are pushed
544 * to the stack. Finally, at the very top of the stack
545 * we always keep the contents of $GIT_DIR/info/attributes.
547 * When checking, we use entries from near the top of the
548 * stack, preferring $GIT_DIR/info/attributes, then
549 * .gitattributes in deeper directories to shallower ones,
550 * and finally use the built-in set as the default.
553 bootstrap_attr_stack();
556 * Pop the "info" one that is always at the top of the stack.
559 attr_stack = info->prev;
562 * Pop the ones from directories that are not the prefix of
563 * the path we are checking.
565 while (attr_stack && attr_stack->origin) {
566 int namelen = strlen(attr_stack->origin);
569 if (namelen <= dirlen &&
570 !strncmp(elem->origin, path, namelen))
574 attr_stack = elem->prev;
575 free_attr_elem(elem);
579 * Read from parent directories and push them down
581 if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
585 len = strlen(attr_stack->origin);
588 strbuf_reset(&pathbuf);
589 strbuf_add(&pathbuf, path, dirlen);
590 strbuf_addch(&pathbuf, '/');
591 cp = strchr(pathbuf.buf + len + 1, '/');
592 strcpy(cp + 1, GITATTRIBUTES_FILE);
593 elem = read_attr(pathbuf.buf, 0);
595 elem->origin = strdup(pathbuf.buf);
596 elem->prev = attr_stack;
602 strbuf_release(&pathbuf);
605 * Finally push the "info" one at the top of the stack.
607 info->prev = attr_stack;
611 static int path_matches(const char *pathname, int pathlen,
613 const char *base, int baselen)
615 if (!strchr(pattern, '/')) {
617 const char *basename = strrchr(pathname, '/');
618 basename = basename ? basename + 1 : pathname;
619 return (fnmatch(pattern, basename, 0) == 0);
622 * match with FNM_PATHNAME; the pattern has base implicitly
627 if (pathlen < baselen ||
628 (baselen && pathname[baselen] != '/') ||
629 strncmp(pathname, base, baselen))
633 return fnmatch(pattern, pathname + baselen, FNM_PATHNAME) == 0;
636 static int macroexpand_one(int attr_nr, int rem);
638 static int fill_one(const char *what, struct match_attr *a, int rem)
640 struct git_attr_check *check = check_all_attr;
643 for (i = a->num_attr - 1; 0 < rem && 0 <= i; i--) {
644 struct git_attr *attr = a->state[i].attr;
645 const char **n = &(check[attr->attr_nr].value);
646 const char *v = a->state[i].setto;
648 if (*n == ATTR__UNKNOWN) {
650 a->is_macro ? a->u.attr->name : a->u.pattern,
654 rem = macroexpand_one(attr->attr_nr, rem);
660 static int fill(const char *path, int pathlen, struct attr_stack *stk, int rem)
663 const char *base = stk->origin ? stk->origin : "";
665 for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) {
666 struct match_attr *a = stk->attrs[i];
669 if (path_matches(path, pathlen,
670 a->u.pattern, base, strlen(base)))
671 rem = fill_one("fill", a, rem);
676 static int macroexpand_one(int attr_nr, int rem)
678 struct attr_stack *stk;
679 struct match_attr *a = NULL;
682 if (check_all_attr[attr_nr].value != ATTR__TRUE)
685 for (stk = attr_stack; !a && stk; stk = stk->prev)
686 for (i = stk->num_matches - 1; !a && 0 <= i; i--) {
687 struct match_attr *ma = stk->attrs[i];
690 if (ma->u.attr->attr_nr == attr_nr)
695 rem = fill_one("expand", a, rem);
700 int git_checkattr(const char *path, int num, struct git_attr_check *check)
702 struct attr_stack *stk;
704 int dirlen, pathlen, i, rem;
706 bootstrap_attr_stack();
707 for (i = 0; i < attr_nr; i++)
708 check_all_attr[i].value = ATTR__UNKNOWN;
710 pathlen = strlen(path);
711 cp = strrchr(path, '/');
716 prepare_attr_stack(path, dirlen);
718 for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
719 rem = fill(path, pathlen, stk, rem);
721 for (i = 0; i < num; i++) {
722 const char *value = check_all_attr[check[i].attr->attr_nr].value;
723 if (value == ATTR__UNKNOWN)
725 check[i].value = value;
731 void git_attr_set_direction(enum git_attr_direction new, struct index_state *istate)
733 enum git_attr_direction old = direction;
735 if (is_bare_repository() && new != GIT_ATTR_INDEX)
736 die("BUG: non-INDEX attr direction in a bare repo");