attr.c

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