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 /*
 119  * One rule, as from a .gitattributes file.
 120  *
 121  * If is_macro is true, then u.attr is a pointer to the git_attr being
 122  * defined.
 123  *
 124  * If is_macro is false, then u.pattern points at the filename pattern
 125  * to which the rule applies.  (The memory pointed to is part of the
 126  * memory block allocated for the match_attr instance.)
 127  *
 128  * In either case, num_attr is the number of attributes affected by
 129  * this rule, and state is an array listing them.  The attributes are
 130  * listed as they appear in the file (macros unexpanded).
 131  */
 132 struct match_attr {
 133         union {
 134                 char *pattern;
 135                 struct git_attr *attr;
 136         } u;
 137         char is_macro;
 138         unsigned num_attr;
 139         struct attr_state state[FLEX_ARRAY];
 140 };
 141
 142 static const char blank[] = " \t\r\n";
 143
 144 /*
 145  * Parse a whitespace-delimited attribute state (i.e., "attr",
 146  * "-attr", "!attr", or "attr=value") from the string starting at src.
 147  * If e is not NULL, write the results to *e.  Return a pointer to the
 148  * remainder of the string (with leading whitespace removed), or NULL
 149  * if there was an error.
 150  */
 151 static const char *parse_attr(const char *src, int lineno, const char *cp,
 152                               struct attr_state *e)
 153 {
 154         const char *ep, *equals;
 155         int len;
 156
 157         ep = cp + strcspn(cp, blank);
 158         equals = strchr(cp, '=');
 159         if (equals && ep < equals)
 160                 equals = NULL;
 161         if (equals)
 162                 len = equals - cp;
 163         else
 164                 len = ep - cp;
 165         if (!e) {
 166                 if (*cp == '-' || *cp == '!') {
 167                         cp++;
 168                         len--;
 169                 }
 170                 if (invalid_attr_name(cp, len)) {
 171                         fprintf(stderr,
 172                                 "%.*s is not a valid attribute name: %s:%d\n",
 173                                 len, cp, src, lineno);
 174                         return NULL;
 175                 }
 176         } else {
 177                 if (*cp == '-' || *cp == '!') {
 178                         e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET;
 179                         cp++;
 180                         len--;
 181                 }
 182                 else if (!equals)
 183                         e->setto = ATTR__TRUE;
 184                 else {
 185                         e->setto = xmemdupz(equals + 1, ep - equals - 1);
 186                 }
 187                 e->attr = git_attr_internal(cp, len);
 188         }
 189         return ep + strspn(ep, blank);
 190 }
 191
 192 static struct match_attr *parse_attr_line(const char *line, const char *src,
 193                                           int lineno, int macro_ok)
 194 {
 195         int namelen;
 196         int num_attr, i;
 197         const char *cp, *name, *states;
 198         struct match_attr *res = NULL;
 199         int is_macro;
 200
 201         cp = line + strspn(line, blank);
 202         if (!*cp || *cp == '#')
 203                 return NULL;
 204         name = cp;
 205         namelen = strcspn(name, blank);
 206         if (strlen(ATTRIBUTE_MACRO_PREFIX) < namelen &&
 207             !prefixcmp(name, ATTRIBUTE_MACRO_PREFIX)) {
 208                 if (!macro_ok) {
 209                         fprintf(stderr, "%s not allowed: %s:%d\n",
 210                                 name, src, lineno);
 211                         return NULL;
 212                 }
 213                 is_macro = 1;
 214                 name += strlen(ATTRIBUTE_MACRO_PREFIX);
 215                 name += strspn(name, blank);
 216                 namelen = strcspn(name, blank);
 217                 if (invalid_attr_name(name, namelen)) {
 218                         fprintf(stderr,
 219                                 "%.*s is not a valid attribute name: %s:%d\n",
 220                                 namelen, name, src, lineno);
 221                         return NULL;
 222                 }
 223         }
 224         else
 225                 is_macro = 0;
 226
 227         states = name + namelen;
 228         states += strspn(states, blank);
 229
 230         /* First pass to count the attr_states */
 231         for (cp = states, num_attr = 0; *cp; num_attr++) {
 232                 cp = parse_attr(src, lineno, cp, NULL);
 233                 if (!cp)
 234                         return NULL;
 235         }
 236
 237         res = xcalloc(1,
 238                       sizeof(*res) +
 239                       sizeof(struct attr_state) * num_attr +
 240                       (is_macro ? 0 : namelen + 1));
 241         if (is_macro)
 242                 res->u.attr = git_attr_internal(name, namelen);
 243         else {
 244                 res->u.pattern = (char *)&(res->state[num_attr]);
 245                 memcpy(res->u.pattern, name, namelen);
 246                 res->u.pattern[namelen] = 0;
 247         }
 248         res->is_macro = is_macro;
 249         res->num_attr = num_attr;
 250
 251         /* Second pass to fill the attr_states */
 252         for (cp = states, i = 0; *cp; i++) {
 253                 cp = parse_attr(src, lineno, cp, &(res->state[i]));
 254         }
 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         size_t originlen;
 281         unsigned num_matches;
 282         unsigned alloc;
 283         struct match_attr **attrs;
 284 } *attr_stack;
 285
 286 static void free_attr_elem(struct attr_stack *e)
 287 {
 288         int i;
 289         free(e->origin);
 290         for (i = 0; i < e->num_matches; i++) {
 291                 struct match_attr *a = e->attrs[i];
 292                 int j;
 293                 for (j = 0; j < a->num_attr; j++) {
 294                         const char *setto = a->state[j].setto;
 295                         if (setto == ATTR__TRUE ||
 296                             setto == ATTR__FALSE ||
 297                             setto == ATTR__UNSET ||
 298                             setto == ATTR__UNKNOWN)
 299                                 ;
 300                         else
 301                                 free((char *) setto);
 302                 }
 303                 free(a);
 304         }
 305         free(e->attrs);
 306         free(e);
 307 }
 308
 309 static const char *builtin_attr[] = {
 310         "[attr]binary -diff -text",
 311         NULL,
 312 };
 313
 314 static void handle_attr_line(struct attr_stack *res,
 315                              const char *line,
 316                              const char *src,
 317                              int lineno,
 318                              int macro_ok)
 319 {
 320         struct match_attr *a;
 321
 322         a = parse_attr_line(line, src, lineno, macro_ok);
 323         if (!a)
 324                 return;
 325         if (res->alloc <= res->num_matches) {
 326                 res->alloc = alloc_nr(res->num_matches);
 327                 res->attrs = xrealloc(res->attrs,
 328                                       sizeof(struct match_attr *) *
 329                                       res->alloc);
 330         }
 331         res->attrs[res->num_matches++] = a;
 332 }
 333
 334 static struct attr_stack *read_attr_from_array(const char **list)
 335 {
 336         struct attr_stack *res;
 337         const char *line;
 338         int lineno = 0;
 339
 340         res = xcalloc(1, sizeof(*res));
 341         while ((line = *(list++)) != NULL)
 342                 handle_attr_line(res, line, "[builtin]", ++lineno, 1);
 343         return res;
 344 }
 345
 346 static enum git_attr_direction direction;
 347 static struct index_state *use_index;
 348
 349 static struct attr_stack *read_attr_from_file(const char *path, int macro_ok)
 350 {
 351         FILE *fp = fopen(path, "r");
 352         struct attr_stack *res;
 353         char buf[2048];
 354         int lineno = 0;
 355
 356         if (!fp)
 357                 return NULL;
 358         res = xcalloc(1, sizeof(*res));
 359         while (fgets(buf, sizeof(buf), fp))
 360                 handle_attr_line(res, buf, path, ++lineno, macro_ok);
 361         fclose(fp);
 362         return res;
 363 }
 364
 365 static void *read_index_data(const char *path)
 366 {
 367         int pos, len;
 368         unsigned long sz;
 369         enum object_type type;
 370         void *data;
 371         struct index_state *istate = use_index ? use_index : &the_index;
 372
 373         len = strlen(path);
 374         pos = index_name_pos(istate, path, len);
 375         if (pos < 0) {
 376                 /*
 377                  * We might be in the middle of a merge, in which
 378                  * case we would read stage #2 (ours).
 379                  */
 380                 int i;
 381                 for (i = -pos - 1;
 382                      (pos < 0 && i < istate->cache_nr &&
 383                       !strcmp(istate->cache[i]->name, path));
 384                      i++)
 385                         if (ce_stage(istate->cache[i]) == 2)
 386                                 pos = i;
 387         }
 388         if (pos < 0)
 389                 return NULL;
 390         data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz);
 391         if (!data || type != OBJ_BLOB) {
 392                 free(data);
 393                 return NULL;
 394         }
 395         return data;
 396 }
 397
 398 static struct attr_stack *read_attr_from_index(const char *path, int macro_ok)
 399 {
 400         struct attr_stack *res;
 401         char *buf, *sp;
 402         int lineno = 0;
 403
 404         buf = read_index_data(path);
 405         if (!buf)
 406                 return NULL;
 407
 408         res = xcalloc(1, sizeof(*res));
 409         for (sp = buf; *sp; ) {
 410                 char *ep;
 411                 int more;
 412                 for (ep = sp; *ep && *ep != '\n'; ep++)
 413                         ;
 414                 more = (*ep == '\n');
 415                 *ep = '\0';
 416                 handle_attr_line(res, sp, path, ++lineno, macro_ok);
 417                 sp = ep + more;
 418         }
 419         free(buf);
 420         return res;
 421 }
 422
 423 static struct attr_stack *read_attr(const char *path, int macro_ok)
 424 {
 425         struct attr_stack *res;
 426
 427         if (direction == GIT_ATTR_CHECKOUT) {
 428                 res = read_attr_from_index(path, macro_ok);
 429                 if (!res)
 430                         res = read_attr_from_file(path, macro_ok);
 431         }
 432         else if (direction == GIT_ATTR_CHECKIN) {
 433                 res = read_attr_from_file(path, macro_ok);
 434                 if (!res)
 435                         /*
 436                          * There is no checked out .gitattributes file there, but
 437                          * we might have it in the index.  We allow operation in a
 438                          * sparsely checked out work tree, so read from it.
 439                          */
 440                         res = read_attr_from_index(path, macro_ok);
 441         }
 442         else
 443                 res = read_attr_from_index(path, macro_ok);
 444         if (!res)
 445                 res = xcalloc(1, sizeof(*res));
 446         return res;
 447 }
 448
 449 #if DEBUG_ATTR
 450 static void debug_info(const char *what, struct attr_stack *elem)
 451 {
 452         fprintf(stderr, "%s: %s\n", what, elem->origin ? elem->origin : "()");
 453 }
 454 static void debug_set(const char *what, const char *match, struct git_attr *attr, const void *v)
 455 {
 456         const char *value = v;
 457
 458         if (ATTR_TRUE(value))
 459                 value = "set";
 460         else if (ATTR_FALSE(value))
 461                 value = "unset";
 462         else if (ATTR_UNSET(value))
 463                 value = "unspecified";
 464
 465         fprintf(stderr, "%s: %s => %s (%s)\n",
 466                 what, attr->name, (char *) value, match);
 467 }
 468 #define debug_push(a) debug_info("push", (a))
 469 #define debug_pop(a) debug_info("pop", (a))
 470 #else
 471 #define debug_push(a) do { ; } while (0)
 472 #define debug_pop(a) do { ; } while (0)
 473 #define debug_set(a,b,c,d) do { ; } while (0)
 474 #endif
 475
 476 static void drop_attr_stack(void)
 477 {
 478         while (attr_stack) {
 479                 struct attr_stack *elem = attr_stack;
 480                 attr_stack = elem->prev;
 481                 free_attr_elem(elem);
 482         }
 483 }
 484
 485 static const char *git_etc_gitattributes(void)
 486 {
 487         static const char *system_wide;
 488         if (!system_wide)
 489                 system_wide = system_path(ETC_GITATTRIBUTES);
 490         return system_wide;
 491 }
 492
 493 static int git_attr_system(void)
 494 {
 495         return !git_env_bool("GIT_ATTR_NOSYSTEM", 0);
 496 }
 497
 498 static void bootstrap_attr_stack(void)
 499 {
 500         struct attr_stack *elem;
 501
 502         if (attr_stack)
 503                 return;
 504
 505         elem = read_attr_from_array(builtin_attr);
 506         elem->origin = NULL;
 507         elem->prev = attr_stack;
 508         attr_stack = elem;
 509
 510         if (git_attr_system()) {
 511                 elem = read_attr_from_file(git_etc_gitattributes(), 1);
 512                 if (elem) {
 513                         elem->origin = NULL;
 514                         elem->prev = attr_stack;
 515                         attr_stack = elem;
 516                 }
 517         }
 518
 519         if (git_attributes_file) {
 520                 elem = read_attr_from_file(git_attributes_file, 1);
 521                 if (elem) {
 522                         elem->origin = NULL;
 523                         elem->prev = attr_stack;
 524                         attr_stack = elem;
 525                 }
 526         }
 527
 528         if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
 529                 elem = read_attr(GITATTRIBUTES_FILE, 1);
 530                 elem->origin = xstrdup("");
 531                 elem->originlen = 0;
 532                 elem->prev = attr_stack;
 533                 attr_stack = elem;
 534                 debug_push(elem);
 535         }
 536
 537         elem = read_attr_from_file(git_path(INFOATTRIBUTES_FILE), 1);
 538         if (!elem)
 539                 elem = xcalloc(1, sizeof(*elem));
 540         elem->origin = NULL;
 541         elem->prev = attr_stack;
 542         attr_stack = elem;
 543 }
 544
 545 static void prepare_attr_stack(const char *path)
 546 {
 547         struct attr_stack *elem, *info;
 548         int dirlen, len;
 549         const char *cp;
 550
 551         cp = strrchr(path, '/');
 552         if (!cp)
 553                 dirlen = 0;
 554         else
 555                 dirlen = cp - path;
 556
 557         /*
 558          * At the bottom of the attribute stack is the built-in
 559          * set of attribute definitions, followed by the contents
 560          * of $(prefix)/etc/gitattributes and a file specified by
 561          * core.attributesfile.  Then, contents from
 562          * .gitattribute files from directories closer to the
 563          * root to the ones in deeper directories are pushed
 564          * to the stack.  Finally, at the very top of the stack
 565          * we always keep the contents of $GIT_DIR/info/attributes.
 566          *
 567          * When checking, we use entries from near the top of the
 568          * stack, preferring $GIT_DIR/info/attributes, then
 569          * .gitattributes in deeper directories to shallower ones,
 570          * and finally use the built-in set as the default.
 571          */
 572         bootstrap_attr_stack();
 573
 574         /*
 575          * Pop the "info" one that is always at the top of the stack.
 576          */
 577         info = attr_stack;
 578         attr_stack = info->prev;
 579
 580         /*
 581          * Pop the ones from directories that are not the prefix of
 582          * the path we are checking. Break out of the loop when we see
 583          * the root one (whose origin is an empty string "") or the builtin
 584          * one (whose origin is NULL) without popping it.
 585          */
 586         while (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                     (!namelen || path[namelen] == '/'))
 593                         break;
 594
 595                 debug_pop(elem);
 596                 attr_stack = elem->prev;
 597                 free_attr_elem(elem);
 598         }
 599
 600         /*
 601          * Read from parent directories and push them down
 602          */
 603         if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
 604                 /*
 605                  * bootstrap_attr_stack() should have added, and the
 606                  * above loop should have stopped before popping, the
 607                  * root element whose attr_stack->origin is set to an
 608                  * empty string.
 609                  */
 610                 struct strbuf pathbuf = STRBUF_INIT;
 611
 612                 assert(attr_stack->origin);
 613                 while (1) {
 614                         len = strlen(attr_stack->origin);
 615                         if (dirlen <= len)
 616                                 break;
 617                         cp = memchr(path + len + 1, '/', dirlen - len - 1);
 618                         if (!cp)
 619                                 cp = path + dirlen;
 620                         strbuf_add(&pathbuf, path, cp - path);
 621                         strbuf_addch(&pathbuf, '/');
 622                         strbuf_addstr(&pathbuf, GITATTRIBUTES_FILE);
 623                         elem = read_attr(pathbuf.buf, 0);
 624                         strbuf_setlen(&pathbuf, cp - path);
 625                         elem->origin = strbuf_detach(&pathbuf, &elem->originlen);
 626                         elem->prev = attr_stack;
 627                         attr_stack = elem;
 628                         debug_push(elem);
 629                 }
 630
 631                 strbuf_release(&pathbuf);
 632         }
 633
 634         /*
 635          * Finally push the "info" one at the top of the stack.
 636          */
 637         info->prev = attr_stack;
 638         attr_stack = info;
 639 }
 640
 641 static int path_matches(const char *pathname, int pathlen,
 642                         const char *basename,
 643                         const char *pattern,
 644                         const char *base, int baselen)
 645 {
 646         if (!strchr(pattern, '/')) {
 647                 return (fnmatch_icase(pattern, basename, 0) == 0);
 648         }
 649         /*
 650          * match with FNM_PATHNAME; the pattern has base implicitly
 651          * in front of it.
 652          */
 653         if (*pattern == '/')
 654                 pattern++;
 655         if (pathlen < baselen ||
 656             (baselen && pathname[baselen] != '/') ||
 657             strncmp(pathname, base, baselen))
 658                 return 0;
 659         if (baselen != 0)
 660                 baselen++;
 661         return fnmatch_icase(pattern, pathname + baselen, FNM_PATHNAME) == 0;
 662 }
 663
 664 static int macroexpand_one(int attr_nr, int rem);
 665
 666 static int fill_one(const char *what, struct match_attr *a, int rem)
 667 {
 668         struct git_attr_check *check = check_all_attr;
 669         int i;
 670
 671         for (i = a->num_attr - 1; 0 < rem && 0 <= i; i--) {
 672                 struct git_attr *attr = a->state[i].attr;
 673                 const char **n = &(check[attr->attr_nr].value);
 674                 const char *v = a->state[i].setto;
 675
 676                 if (*n == ATTR__UNKNOWN) {
 677                         debug_set(what,
 678                                   a->is_macro ? a->u.attr->name : a->u.pattern,
 679                                   attr, v);
 680                         *n = v;
 681                         rem--;
 682                         rem = macroexpand_one(attr->attr_nr, rem);
 683                 }
 684         }
 685         return rem;
 686 }
 687
 688 static int fill(const char *path, int pathlen, const char *basename,
 689                 struct attr_stack *stk, int rem)
 690 {
 691         int i;
 692         const char *base = stk->origin ? stk->origin : "";
 693
 694         for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) {
 695                 struct match_attr *a = stk->attrs[i];
 696                 if (a->is_macro)
 697                         continue;
 698                 if (path_matches(path, pathlen, basename,
 699                                  a->u.pattern, base, stk->originlen))
 700                         rem = fill_one("fill", a, rem);
 701         }
 702         return rem;
 703 }
 704
 705 static int macroexpand_one(int attr_nr, int rem)
 706 {
 707         struct attr_stack *stk;
 708         struct match_attr *a = NULL;
 709         int i;
 710
 711         if (check_all_attr[attr_nr].value != ATTR__TRUE)
 712                 return rem;
 713
 714         for (stk = attr_stack; !a && stk; stk = stk->prev)
 715                 for (i = stk->num_matches - 1; !a && 0 <= i; i--) {
 716                         struct match_attr *ma = stk->attrs[i];
 717                         if (!ma->is_macro)
 718                                 continue;
 719                         if (ma->u.attr->attr_nr == attr_nr)
 720                                 a = ma;
 721                 }
 722
 723         if (a)
 724                 rem = fill_one("expand", a, rem);
 725
 726         return rem;
 727 }
 728
 729 /*
 730  * Collect all attributes for path into the array pointed to by
 731  * check_all_attr.
 732  */
 733 static void collect_all_attrs(const char *path)
 734 {
 735         struct attr_stack *stk;
 736         int i, pathlen, rem;
 737         const char *basename;
 738
 739         prepare_attr_stack(path);
 740         for (i = 0; i < attr_nr; i++)
 741                 check_all_attr[i].value = ATTR__UNKNOWN;
 742
 743         basename = strrchr(path, '/');
 744         basename = basename ? basename + 1 : path;
 745
 746         pathlen = strlen(path);
 747         rem = attr_nr;
 748         for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
 749                 rem = fill(path, pathlen, basename, stk, rem);
 750 }
 751
 752 int git_check_attr(const char *path, int num, struct git_attr_check *check)
 753 {
 754         int i;
 755
 756         collect_all_attrs(path);
 757
 758         for (i = 0; i < num; i++) {
 759                 const char *value = check_all_attr[check[i].attr->attr_nr].value;
 760                 if (value == ATTR__UNKNOWN)
 761                         value = ATTR__UNSET;
 762                 check[i].value = value;
 763         }
 764
 765         return 0;
 766 }
 767
 768 int git_all_attrs(const char *path, int *num, struct git_attr_check **check)
 769 {
 770         int i, count, j;
 771
 772         collect_all_attrs(path);
 773
 774         /* Count the number of attributes that are set. */
 775         count = 0;
 776         for (i = 0; i < attr_nr; i++) {
 777                 const char *value = check_all_attr[i].value;
 778                 if (value != ATTR__UNSET && value != ATTR__UNKNOWN)
 779                         ++count;
 780         }
 781         *num = count;
 782         *check = xmalloc(sizeof(**check) * count);
 783         j = 0;
 784         for (i = 0; i < attr_nr; i++) {
 785                 const char *value = check_all_attr[i].value;
 786                 if (value != ATTR__UNSET && value != ATTR__UNKNOWN) {
 787                         (*check)[j].attr = check_all_attr[i].attr;
 788                         (*check)[j].value = value;
 789                         ++j;
 790                 }
 791         }
 792
 793         return 0;
 794 }
 795
 796 void git_attr_set_direction(enum git_attr_direction new, struct index_state *istate)
 797 {
 798         enum git_attr_direction old = direction;
 799
 800         if (is_bare_repository() && new != GIT_ATTR_INDEX)
 801                 die("BUG: non-INDEX attr direction in a bare repo");
 802
 803         direction = new;
 804         if (new != old)
 805                 drop_attr_stack();
 806         use_index = istate;
 807 }