attr.c

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