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