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 #include "dir.h"
  15
  16 const char git_attr__true[] = "(builtin)true";
  17 const char git_attr__false[] = "\0(builtin)false";
  18 static const char git_attr__unknown[] = "(builtin)unknown";
  19 #define ATTR__TRUE git_attr__true
  20 #define ATTR__FALSE git_attr__false
  21 #define ATTR__UNSET NULL
  22 #define ATTR__UNKNOWN git_attr__unknown
  23
  24 /* This is a randomly chosen prime. */
  25 #define HASHSIZE 257
  26
  27 #ifndef DEBUG_ATTR
  28 #define DEBUG_ATTR 0
  29 #endif
  30
  31 struct git_attr {
  32         struct git_attr *next;
  33         unsigned h;
  34         int attr_nr;
  35         char name[FLEX_ARRAY];
  36 };
  37 static int attr_nr;
  38
  39 static struct git_attr_check *check_all_attr;
  40 static struct git_attr *(git_attr_hash[HASHSIZE]);
  41
  42 char *git_attr_name(struct git_attr *attr)
  43 {
  44         return attr->name;
  45 }
  46
  47 static unsigned hash_name(const char *name, int namelen)
  48 {
  49         unsigned val = 0, c;
  50
  51         while (namelen--) {
  52                 c = *name++;
  53                 val = ((val << 7) | (val >> 22)) ^ c;
  54         }
  55         return val;
  56 }
  57
  58 static int invalid_attr_name(const char *name, int namelen)
  59 {
  60         /*
  61          * Attribute name cannot begin with '-' and must consist of
  62          * characters from [-A-Za-z0-9_.].
  63          */
  64         if (namelen <= 0 || *name == '-')
  65                 return -1;
  66         while (namelen--) {
  67                 char ch = *name++;
  68                 if (! (ch == '-' || ch == '.' || ch == '_' ||
  69                        ('0' <= ch && ch <= '9') ||
  70                        ('a' <= ch && ch <= 'z') ||
  71                        ('A' <= ch && ch <= 'Z')) )
  72                         return -1;
  73         }
  74         return 0;
  75 }
  76
  77 static struct git_attr *git_attr_internal(const char *name, int len)
  78 {
  79         unsigned hval = hash_name(name, len);
  80         unsigned pos = hval % HASHSIZE;
  81         struct git_attr *a;
  82
  83         for (a = git_attr_hash[pos]; a; a = a->next) {
  84                 if (a->h == hval &&
  85                     !memcmp(a->name, name, len) && !a->name[len])
  86                         return a;
  87         }
  88
  89         if (invalid_attr_name(name, len))
  90                 return NULL;
  91
  92         a = xmalloc(sizeof(*a) + len + 1);
  93         memcpy(a->name, name, len);
  94         a->name[len] = 0;
  95         a->h = hval;
  96         a->next = git_attr_hash[pos];
  97         a->attr_nr = attr_nr++;
  98         git_attr_hash[pos] = a;
  99
 100         check_all_attr = xrealloc(check_all_attr,
 101                                   sizeof(*check_all_attr) * attr_nr);
 102         check_all_attr[a->attr_nr].attr = a;
 103         check_all_attr[a->attr_nr].value = ATTR__UNKNOWN;
 104         return a;
 105 }
 106
 107 struct git_attr *git_attr(const char *name)
 108 {
 109         return git_attr_internal(name, strlen(name));
 110 }
 111
 112 /* What does a matched pattern decide? */
 113 struct attr_state {
 114         struct git_attr *attr;
 115         const char *setto;
 116 };
 117
 118 struct pattern {
 119         const char *pattern;
 120         int patternlen;
 121         int nowildcardlen;
 122         int flags;              /* EXC_FLAG_* */
 123 };
 124
 125 /*
 126  * One rule, as from a .gitattributes file.
 127  *
 128  * If is_macro is true, then u.attr is a pointer to the git_attr being
 129  * defined.
 130  *
 131  * If is_macro is false, then u.pattern points at the filename pattern
 132  * to which the rule applies.  (The memory pointed to is part of the
 133  * memory block allocated for the match_attr instance.)
 134  *
 135  * In either case, num_attr is the number of attributes affected by
 136  * this rule, and state is an array listing them.  The attributes are
 137  * listed as they appear in the file (macros unexpanded).
 138  */
 139 struct match_attr {
 140         union {
 141                 struct pattern pat;
 142                 struct git_attr *attr;
 143         } u;
 144         char is_macro;
 145         unsigned num_attr;
 146         struct attr_state state[FLEX_ARRAY];
 147 };
 148
 149 static const char blank[] = " \t\r\n";
 150
 151 /*
 152  * Parse a whitespace-delimited attribute state (i.e., "attr",
 153  * "-attr", "!attr", or "attr=value") from the string starting at src.
 154  * If e is not NULL, write the results to *e.  Return a pointer to the
 155  * remainder of the string (with leading whitespace removed), or NULL
 156  * if there was an error.
 157  */
 158 static const char *parse_attr(const char *src, int lineno, const char *cp,
 159                               struct attr_state *e)
 160 {
 161         const char *ep, *equals;
 162         int len;
 163
 164         ep = cp + strcspn(cp, blank);
 165         equals = strchr(cp, '=');
 166         if (equals && ep < equals)
 167                 equals = NULL;
 168         if (equals)
 169                 len = equals - cp;
 170         else
 171                 len = ep - cp;
 172         if (!e) {
 173                 if (*cp == '-' || *cp == '!') {
 174                         cp++;
 175                         len--;
 176                 }
 177                 if (invalid_attr_name(cp, len)) {
 178                         fprintf(stderr,
 179                                 "%.*s is not a valid attribute name: %s:%d\n",
 180                                 len, cp, src, lineno);
 181                         return NULL;
 182                 }
 183         } else {
 184                 if (*cp == '-' || *cp == '!') {
 185                         e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET;
 186                         cp++;
 187                         len--;
 188                 }
 189                 else if (!equals)
 190                         e->setto = ATTR__TRUE;
 191                 else {
 192                         e->setto = xmemdupz(equals + 1, ep - equals - 1);
 193                 }
 194                 e->attr = git_attr_internal(cp, len);
 195         }
 196         return ep + strspn(ep, blank);
 197 }
 198
 199 static struct match_attr *parse_attr_line(const char *line, const char *src,
 200                                           int lineno, int macro_ok)
 201 {
 202         int namelen;
 203         int num_attr, i;
 204         const char *cp, *name, *states;
 205         struct match_attr *res = NULL;
 206         int is_macro;
 207
 208         cp = line + strspn(line, blank);
 209         if (!*cp || *cp == '#')
 210                 return NULL;
 211         name = cp;
 212         namelen = strcspn(name, blank);
 213         if (strlen(ATTRIBUTE_MACRO_PREFIX) < namelen &&
 214             starts_with(name, ATTRIBUTE_MACRO_PREFIX)) {
 215                 if (!macro_ok) {
 216                         fprintf(stderr, "%s not allowed: %s:%d\n",
 217                                 name, src, lineno);
 218                         return NULL;
 219                 }
 220                 is_macro = 1;
 221                 name += strlen(ATTRIBUTE_MACRO_PREFIX);
 222                 name += strspn(name, blank);
 223                 namelen = strcspn(name, blank);
 224                 if (invalid_attr_name(name, namelen)) {
 225                         fprintf(stderr,
 226                                 "%.*s is not a valid attribute name: %s:%d\n",
 227                                 namelen, name, src, lineno);
 228                         return NULL;
 229                 }
 230         }
 231         else
 232                 is_macro = 0;
 233
 234         states = name + namelen;
 235         states += strspn(states, blank);
 236
 237         /* First pass to count the attr_states */
 238         for (cp = states, num_attr = 0; *cp; num_attr++) {
 239                 cp = parse_attr(src, lineno, cp, NULL);
 240                 if (!cp)
 241                         return NULL;
 242         }
 243
 244         res = xcalloc(1,
 245                       sizeof(*res) +
 246                       sizeof(struct attr_state) * num_attr +
 247                       (is_macro ? 0 : namelen + 1));
 248         if (is_macro)
 249                 res->u.attr = git_attr_internal(name, namelen);
 250         else {
 251                 char *p = (char *)&(res->state[num_attr]);
 252                 memcpy(p, name, namelen);
 253                 res->u.pat.pattern = p;
 254                 parse_exclude_pattern(&res->u.pat.pattern,
 255                                       &res->u.pat.patternlen,
 256                                       &res->u.pat.flags,
 257                                       &res->u.pat.nowildcardlen);
 258                 if (res->u.pat.flags & EXC_FLAG_NEGATIVE) {
 259                         warning(_("Negative patterns are ignored in git attributes\n"
 260                                   "Use '\\!' for literal leading exclamation."));
 261                         return NULL;
 262                 }
 263         }
 264         res->is_macro = is_macro;
 265         res->num_attr = num_attr;
 266
 267         /* Second pass to fill the attr_states */
 268         for (cp = states, i = 0; *cp; i++) {
 269                 cp = parse_attr(src, lineno, cp, &(res->state[i]));
 270         }
 271
 272         return res;
 273 }
 274
 275 /*
 276  * Like info/exclude and .gitignore, the attribute information can
 277  * come from many places.
 278  *
 279  * (1) .gitattribute file of the same directory;
 280  * (2) .gitattribute file of the parent directory if (1) does not have
 281  *      any match; this goes recursively upwards, just like .gitignore.
 282  * (3) $GIT_DIR/info/attributes, which overrides both of the above.
 283  *
 284  * In the same file, later entries override the earlier match, so in the
 285  * global list, we would have entries from info/attributes the earliest
 286  * (reading the file from top to bottom), .gitattribute of the root
 287  * directory (again, reading the file from top to bottom) down to the
 288  * current directory, and then scan the list backwards to find the first match.
 289  * This is exactly the same as what is_excluded() does in dir.c to deal with
 290  * .gitignore
 291  */
 292
 293 static struct attr_stack {
 294         struct attr_stack *prev;
 295         char *origin;
 296         size_t originlen;
 297         unsigned num_matches;
 298         unsigned alloc;
 299         struct match_attr **attrs;
 300 } *attr_stack;
 301
 302 static void free_attr_elem(struct attr_stack *e)
 303 {
 304         int i;
 305         free(e->origin);
 306         for (i = 0; i < e->num_matches; i++) {
 307                 struct match_attr *a = e->attrs[i];
 308                 int j;
 309                 for (j = 0; j < a->num_attr; j++) {
 310                         const char *setto = a->state[j].setto;
 311                         if (setto == ATTR__TRUE ||
 312                             setto == ATTR__FALSE ||
 313                             setto == ATTR__UNSET ||
 314                             setto == ATTR__UNKNOWN)
 315                                 ;
 316                         else
 317                                 free((char *) setto);
 318                 }
 319                 free(a);
 320         }
 321         free(e->attrs);
 322         free(e);
 323 }
 324
 325 static const char *builtin_attr[] = {
 326         "[attr]binary -diff -merge -text",
 327         NULL,
 328 };
 329
 330 static void handle_attr_line(struct attr_stack *res,
 331                              const char *line,
 332                              const char *src,
 333                              int lineno,
 334                              int macro_ok)
 335 {
 336         struct match_attr *a;
 337
 338         a = parse_attr_line(line, src, lineno, macro_ok);
 339         if (!a)
 340                 return;
 341         ALLOC_GROW(res->attrs, res->num_matches + 1, res->alloc);
 342         res->attrs[res->num_matches++] = a;
 343 }
 344
 345 static struct attr_stack *read_attr_from_array(const char **list)
 346 {
 347         struct attr_stack *res;
 348         const char *line;
 349         int lineno = 0;
 350
 351         res = xcalloc(1, sizeof(*res));
 352         while ((line = *(list++)) != NULL)
 353                 handle_attr_line(res, line, "[builtin]", ++lineno, 1);
 354         return res;
 355 }
 356
 357 static enum git_attr_direction direction;
 358 static struct index_state *use_index;
 359
 360 static struct attr_stack *read_attr_from_file(const char *path, int macro_ok)
 361 {
 362         FILE *fp = fopen(path, "r");
 363         struct attr_stack *res;
 364         char buf[2048];
 365         int lineno = 0;
 366
 367         if (!fp) {
 368                 if (errno != ENOENT && errno != ENOTDIR)
 369                         warn_on_inaccessible(path);
 370                 return NULL;
 371         }
 372         res = xcalloc(1, sizeof(*res));
 373         while (fgets(buf, sizeof(buf), fp))
 374                 handle_attr_line(res, buf, path, ++lineno, macro_ok);
 375         fclose(fp);
 376         return res;
 377 }
 378
 379 static struct attr_stack *read_attr_from_index(const char *path, int macro_ok)
 380 {
 381         struct attr_stack *res;
 382         char *buf, *sp;
 383         int lineno = 0;
 384
 385         buf = read_blob_data_from_index(use_index ? use_index : &the_index, path, NULL);
 386         if (!buf)
 387                 return NULL;
 388
 389         res = xcalloc(1, sizeof(*res));
 390         for (sp = buf; *sp; ) {
 391                 char *ep;
 392                 int more;
 393                 for (ep = sp; *ep && *ep != '\n'; ep++)
 394                         ;
 395                 more = (*ep == '\n');
 396                 *ep = '\0';
 397                 handle_attr_line(res, sp, path, ++lineno, macro_ok);
 398                 sp = ep + more;
 399         }
 400         free(buf);
 401         return res;
 402 }
 403
 404 static struct attr_stack *read_attr(const char *path, int macro_ok)
 405 {
 406         struct attr_stack *res;
 407
 408         if (direction == GIT_ATTR_CHECKOUT) {
 409                 res = read_attr_from_index(path, macro_ok);
 410                 if (!res)
 411                         res = read_attr_from_file(path, macro_ok);
 412         }
 413         else if (direction == GIT_ATTR_CHECKIN) {
 414                 res = read_attr_from_file(path, macro_ok);
 415                 if (!res)
 416                         /*
 417                          * There is no checked out .gitattributes file there, but
 418                          * we might have it in the index.  We allow operation in a
 419                          * sparsely checked out work tree, so read from it.
 420                          */
 421                         res = read_attr_from_index(path, macro_ok);
 422         }
 423         else
 424                 res = read_attr_from_index(path, macro_ok);
 425         if (!res)
 426                 res = xcalloc(1, sizeof(*res));
 427         return res;
 428 }
 429
 430 #if DEBUG_ATTR
 431 static void debug_info(const char *what, struct attr_stack *elem)
 432 {
 433         fprintf(stderr, "%s: %s\n", what, elem->origin ? elem->origin : "()");
 434 }
 435 static void debug_set(const char *what, const char *match, struct git_attr *attr, const void *v)
 436 {
 437         const char *value = v;
 438
 439         if (ATTR_TRUE(value))
 440                 value = "set";
 441         else if (ATTR_FALSE(value))
 442                 value = "unset";
 443         else if (ATTR_UNSET(value))
 444                 value = "unspecified";
 445
 446         fprintf(stderr, "%s: %s => %s (%s)\n",
 447                 what, attr->name, (char *) value, match);
 448 }
 449 #define debug_push(a) debug_info("push", (a))
 450 #define debug_pop(a) debug_info("pop", (a))
 451 #else
 452 #define debug_push(a) do { ; } while (0)
 453 #define debug_pop(a) do { ; } while (0)
 454 #define debug_set(a,b,c,d) do { ; } while (0)
 455 #endif
 456
 457 static void drop_attr_stack(void)
 458 {
 459         while (attr_stack) {
 460                 struct attr_stack *elem = attr_stack;
 461                 attr_stack = elem->prev;
 462                 free_attr_elem(elem);
 463         }
 464 }
 465
 466 static const char *git_etc_gitattributes(void)
 467 {
 468         static const char *system_wide;
 469         if (!system_wide)
 470                 system_wide = system_path(ETC_GITATTRIBUTES);
 471         return system_wide;
 472 }
 473
 474 static int git_attr_system(void)
 475 {
 476         return !git_env_bool("GIT_ATTR_NOSYSTEM", 0);
 477 }
 478
 479 static void bootstrap_attr_stack(void)
 480 {
 481         struct attr_stack *elem;
 482         char *xdg_attributes_file;
 483
 484         if (attr_stack)
 485                 return;
 486
 487         elem = read_attr_from_array(builtin_attr);
 488         elem->origin = NULL;
 489         elem->prev = attr_stack;
 490         attr_stack = elem;
 491
 492         if (git_attr_system()) {
 493                 elem = read_attr_from_file(git_etc_gitattributes(), 1);
 494                 if (elem) {
 495                         elem->origin = NULL;
 496                         elem->prev = attr_stack;
 497                         attr_stack = elem;
 498                 }
 499         }
 500
 501         if (!git_attributes_file) {
 502                 home_config_paths(NULL, &xdg_attributes_file, "attributes");
 503                 git_attributes_file = xdg_attributes_file;
 504         }
 505         if (git_attributes_file) {
 506                 elem = read_attr_from_file(git_attributes_file, 1);
 507                 if (elem) {
 508                         elem->origin = NULL;
 509                         elem->prev = attr_stack;
 510                         attr_stack = elem;
 511                 }
 512         }
 513
 514         if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
 515                 elem = read_attr(GITATTRIBUTES_FILE, 1);
 516                 elem->origin = xstrdup("");
 517                 elem->originlen = 0;
 518                 elem->prev = attr_stack;
 519                 attr_stack = elem;
 520                 debug_push(elem);
 521         }
 522
 523         elem = read_attr_from_file(git_path(INFOATTRIBUTES_FILE), 1);
 524         if (!elem)
 525                 elem = xcalloc(1, sizeof(*elem));
 526         elem->origin = NULL;
 527         elem->prev = attr_stack;
 528         attr_stack = elem;
 529 }
 530
 531 static void prepare_attr_stack(const char *path, int dirlen)
 532 {
 533         struct attr_stack *elem, *info;
 534         int len;
 535         const char *cp;
 536
 537         /*
 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.
 546          *
 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.
 551          */
 552         bootstrap_attr_stack();
 553
 554         /*
 555          * Pop the "info" one that is always at the top of the stack.
 556          */
 557         info = attr_stack;
 558         attr_stack = info->prev;
 559
 560         /*
 561          * Pop the ones from directories that are not the prefix of
 562          * the path we are checking. Break out of the loop when we see
 563          * the root one (whose origin is an empty string "") or the builtin
 564          * one (whose origin is NULL) without popping it.
 565          */
 566         while (attr_stack->origin) {
 567                 int namelen = strlen(attr_stack->origin);
 568
 569                 elem = attr_stack;
 570                 if (namelen <= dirlen &&
 571                     !strncmp(elem->origin, path, namelen) &&
 572                     (!namelen || path[namelen] == '/'))
 573                         break;
 574
 575                 debug_pop(elem);
 576                 attr_stack = elem->prev;
 577                 free_attr_elem(elem);
 578         }
 579
 580         /*
 581          * Read from parent directories and push them down
 582          */
 583         if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
 584                 /*
 585                  * bootstrap_attr_stack() should have added, and the
 586                  * above loop should have stopped before popping, the
 587                  * root element whose attr_stack->origin is set to an
 588                  * empty string.
 589                  */
 590                 struct strbuf pathbuf = STRBUF_INIT;
 591
 592                 assert(attr_stack->origin);
 593                 while (1) {
 594                         len = strlen(attr_stack->origin);
 595                         if (dirlen <= len)
 596                                 break;
 597                         cp = memchr(path + len + 1, '/', dirlen - len - 1);
 598                         if (!cp)
 599                                 cp = path + dirlen;
 600                         strbuf_add(&pathbuf, path, cp - path);
 601                         strbuf_addch(&pathbuf, '/');
 602                         strbuf_addstr(&pathbuf, GITATTRIBUTES_FILE);
 603                         elem = read_attr(pathbuf.buf, 0);
 604                         strbuf_setlen(&pathbuf, cp - path);
 605                         elem->origin = strbuf_detach(&pathbuf, &elem->originlen);
 606                         elem->prev = attr_stack;
 607                         attr_stack = elem;
 608                         debug_push(elem);
 609                 }
 610
 611                 strbuf_release(&pathbuf);
 612         }
 613
 614         /*
 615          * Finally push the "info" one at the top of the stack.
 616          */
 617         info->prev = attr_stack;
 618         attr_stack = info;
 619 }
 620
 621 static int path_matches(const char *pathname, int pathlen,
 622                         int basename_offset,
 623                         const struct pattern *pat,
 624                         const char *base, int baselen)
 625 {
 626         const char *pattern = pat->pattern;
 627         int prefix = pat->nowildcardlen;
 628         int isdir = (pathlen && pathname[pathlen - 1] == '/');
 629
 630         if ((pat->flags & EXC_FLAG_MUSTBEDIR) && !isdir)
 631                 return 0;
 632
 633         if (pat->flags & EXC_FLAG_NODIR) {
 634                 return match_basename(pathname + basename_offset,
 635                                       pathlen - basename_offset - isdir,
 636                                       pattern, prefix,
 637                                       pat->patternlen, pat->flags);
 638         }
 639         return match_pathname(pathname, pathlen - isdir,
 640                               base, baselen,
 641                               pattern, prefix, pat->patternlen, pat->flags);
 642 }
 643
 644 static int macroexpand_one(int attr_nr, int rem);
 645
 646 static int fill_one(const char *what, struct match_attr *a, int rem)
 647 {
 648         struct git_attr_check *check = check_all_attr;
 649         int i;
 650
 651         for (i = a->num_attr - 1; 0 < rem && 0 <= i; i--) {
 652                 struct git_attr *attr = a->state[i].attr;
 653                 const char **n = &(check[attr->attr_nr].value);
 654                 const char *v = a->state[i].setto;
 655
 656                 if (*n == ATTR__UNKNOWN) {
 657                         debug_set(what,
 658                                   a->is_macro ? a->u.attr->name : a->u.pat.pattern,
 659                                   attr, v);
 660                         *n = v;
 661                         rem--;
 662                         rem = macroexpand_one(attr->attr_nr, rem);
 663                 }
 664         }
 665         return rem;
 666 }
 667
 668 static int fill(const char *path, int pathlen, int basename_offset,
 669                 struct attr_stack *stk, int rem)
 670 {
 671         int i;
 672         const char *base = stk->origin ? stk->origin : "";
 673
 674         for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) {
 675                 struct match_attr *a = stk->attrs[i];
 676                 if (a->is_macro)
 677                         continue;
 678                 if (path_matches(path, pathlen, basename_offset,
 679                                  &a->u.pat, base, stk->originlen))
 680                         rem = fill_one("fill", a, rem);
 681         }
 682         return rem;
 683 }
 684
 685 static int macroexpand_one(int attr_nr, int rem)
 686 {
 687         struct attr_stack *stk;
 688         struct match_attr *a = NULL;
 689         int i;
 690
 691         if (check_all_attr[attr_nr].value != ATTR__TRUE)
 692                 return rem;
 693
 694         for (stk = attr_stack; !a && stk; stk = stk->prev)
 695                 for (i = stk->num_matches - 1; !a && 0 <= i; i--) {
 696                         struct match_attr *ma = stk->attrs[i];
 697                         if (!ma->is_macro)
 698                                 continue;
 699                         if (ma->u.attr->attr_nr == attr_nr)
 700                                 a = ma;
 701                 }
 702
 703         if (a)
 704                 rem = fill_one("expand", a, rem);
 705
 706         return rem;
 707 }
 708
 709 /*
 710  * Collect all attributes for path into the array pointed to by
 711  * check_all_attr.
 712  */
 713 static void collect_all_attrs(const char *path)
 714 {
 715         struct attr_stack *stk;
 716         int i, pathlen, rem, dirlen;
 717         const char *cp, *last_slash = NULL;
 718         int basename_offset;
 719
 720         for (cp = path; *cp; cp++) {
 721                 if (*cp == '/' && cp[1])
 722                         last_slash = cp;
 723         }
 724         pathlen = cp - path;
 725         if (last_slash) {
 726                 basename_offset = last_slash + 1 - path;
 727                 dirlen = last_slash - path;
 728         } else {
 729                 basename_offset = 0;
 730                 dirlen = 0;
 731         }
 732
 733         prepare_attr_stack(path, dirlen);
 734         for (i = 0; i < attr_nr; i++)
 735                 check_all_attr[i].value = ATTR__UNKNOWN;
 736
 737         rem = attr_nr;
 738         for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
 739                 rem = fill(path, pathlen, basename_offset, stk, rem);
 740 }
 741
 742 int git_check_attr(const char *path, int num, struct git_attr_check *check)
 743 {
 744         int i;
 745
 746         collect_all_attrs(path);
 747
 748         for (i = 0; i < num; i++) {
 749                 const char *value = check_all_attr[check[i].attr->attr_nr].value;
 750                 if (value == ATTR__UNKNOWN)
 751                         value = ATTR__UNSET;
 752                 check[i].value = value;
 753         }
 754
 755         return 0;
 756 }
 757
 758 int git_all_attrs(const char *path, int *num, struct git_attr_check **check)
 759 {
 760         int i, count, j;
 761
 762         collect_all_attrs(path);
 763
 764         /* Count the number of attributes that are set. */
 765         count = 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                         ++count;
 770         }
 771         *num = count;
 772         *check = xmalloc(sizeof(**check) * count);
 773         j = 0;
 774         for (i = 0; i < attr_nr; i++) {
 775                 const char *value = check_all_attr[i].value;
 776                 if (value != ATTR__UNSET && value != ATTR__UNKNOWN) {
 777                         (*check)[j].attr = check_all_attr[i].attr;
 778                         (*check)[j].value = value;
 779                         ++j;
 780                 }
 781         }
 782
 783         return 0;
 784 }
 785
 786 void git_attr_set_direction(enum git_attr_direction new, struct index_state *istate)
 787 {
 788         enum git_attr_direction old = direction;
 789
 790         if (is_bare_repository() && new != GIT_ATTR_INDEX)
 791                 die("BUG: non-INDEX attr direction in a bare repo");
 792
 793         direction = new;
 794         if (new != old)
 795                 drop_attr_stack();
 796         use_index = istate;
 797 }