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             !prefixcmp(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                         die(_("Negative patterns are forbidden in git attributes\n"
 260                               "Use '\\!' for literal leading exclamation."));
 261         }
 262         res->is_macro = is_macro;
 263         res->num_attr = num_attr;
 264
 265         /* Second pass to fill the attr_states */
 266         for (cp = states, i = 0; *cp; i++) {
 267                 cp = parse_attr(src, lineno, cp, &(res->state[i]));
 268         }
 269
 270         return res;
 271 }
 272
 273 /*
 274  * Like info/exclude and .gitignore, the attribute information can
 275  * come from many places.
 276  *
 277  * (1) .gitattribute file of the same directory;
 278  * (2) .gitattribute file of the parent directory if (1) does not have
 279  *      any match; this goes recursively upwards, just like .gitignore.
 280  * (3) $GIT_DIR/info/attributes, which overrides both of the above.
 281  *
 282  * In the same file, later entries override the earlier match, so in the
 283  * global list, we would have entries from info/attributes the earliest
 284  * (reading the file from top to bottom), .gitattribute of the root
 285  * directory (again, reading the file from top to bottom) down to the
 286  * current directory, and then scan the list backwards to find the first match.
 287  * This is exactly the same as what excluded() does in dir.c to deal with
 288  * .gitignore
 289  */
 290
 291 static struct attr_stack {
 292         struct attr_stack *prev;
 293         char *origin;
 294         size_t originlen;
 295         unsigned num_matches;
 296         unsigned alloc;
 297         struct match_attr **attrs;
 298 } *attr_stack;
 299
 300 static void free_attr_elem(struct attr_stack *e)
 301 {
 302         int i;
 303         free(e->origin);
 304         for (i = 0; i < e->num_matches; i++) {
 305                 struct match_attr *a = e->attrs[i];
 306                 int j;
 307                 for (j = 0; j < a->num_attr; j++) {
 308                         const char *setto = a->state[j].setto;
 309                         if (setto == ATTR__TRUE ||
 310                             setto == ATTR__FALSE ||
 311                             setto == ATTR__UNSET ||
 312                             setto == ATTR__UNKNOWN)
 313                                 ;
 314                         else
 315                                 free((char *) setto);
 316                 }
 317                 free(a);
 318         }
 319         free(e->attrs);
 320         free(e);
 321 }
 322
 323 static const char *builtin_attr[] = {
 324         "[attr]binary -diff -merge -text",
 325         NULL,
 326 };
 327
 328 static void handle_attr_line(struct attr_stack *res,
 329                              const char *line,
 330                              const char *src,
 331                              int lineno,
 332                              int macro_ok)
 333 {
 334         struct match_attr *a;
 335
 336         a = parse_attr_line(line, src, lineno, macro_ok);
 337         if (!a)
 338                 return;
 339         if (res->alloc <= res->num_matches) {
 340                 res->alloc = alloc_nr(res->num_matches);
 341                 res->attrs = xrealloc(res->attrs,
 342                                       sizeof(struct match_attr *) *
 343                                       res->alloc);
 344         }
 345         res->attrs[res->num_matches++] = a;
 346 }
 347
 348 static struct attr_stack *read_attr_from_array(const char **list)
 349 {
 350         struct attr_stack *res;
 351         const char *line;
 352         int lineno = 0;
 353
 354         res = xcalloc(1, sizeof(*res));
 355         while ((line = *(list++)) != NULL)
 356                 handle_attr_line(res, line, "[builtin]", ++lineno, 1);
 357         return res;
 358 }
 359
 360 static enum git_attr_direction direction;
 361 static struct index_state *use_index;
 362
 363 static struct attr_stack *read_attr_from_file(const char *path, int macro_ok)
 364 {
 365         FILE *fp = fopen(path, "r");
 366         struct attr_stack *res;
 367         char buf[2048];
 368         int lineno = 0;
 369
 370         if (!fp) {
 371                 if (errno != ENOENT && errno != ENOTDIR)
 372                         warn_on_inaccessible(path);
 373                 return NULL;
 374         }
 375         res = xcalloc(1, sizeof(*res));
 376         while (fgets(buf, sizeof(buf), fp))
 377                 handle_attr_line(res, buf, path, ++lineno, macro_ok);
 378         fclose(fp);
 379         return res;
 380 }
 381
 382 static void *read_index_data(const char *path)
 383 {
 384         int pos, len;
 385         unsigned long sz;
 386         enum object_type type;
 387         void *data;
 388         struct index_state *istate = use_index ? use_index : &the_index;
 389
 390         len = strlen(path);
 391         pos = index_name_pos(istate, path, len);
 392         if (pos < 0) {
 393                 /*
 394                  * We might be in the middle of a merge, in which
 395                  * case we would read stage #2 (ours).
 396                  */
 397                 int i;
 398                 for (i = -pos - 1;
 399                      (pos < 0 && i < istate->cache_nr &&
 400                       !strcmp(istate->cache[i]->name, path));
 401                      i++)
 402                         if (ce_stage(istate->cache[i]) == 2)
 403                                 pos = i;
 404         }
 405         if (pos < 0)
 406                 return NULL;
 407         data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz);
 408         if (!data || type != OBJ_BLOB) {
 409                 free(data);
 410                 return NULL;
 411         }
 412         return data;
 413 }
 414
 415 static struct attr_stack *read_attr_from_index(const char *path, int macro_ok)
 416 {
 417         struct attr_stack *res;
 418         char *buf, *sp;
 419         int lineno = 0;
 420
 421         buf = read_index_data(path);
 422         if (!buf)
 423                 return NULL;
 424
 425         res = xcalloc(1, sizeof(*res));
 426         for (sp = buf; *sp; ) {
 427                 char *ep;
 428                 int more;
 429                 for (ep = sp; *ep && *ep != '\n'; ep++)
 430                         ;
 431                 more = (*ep == '\n');
 432                 *ep = '\0';
 433                 handle_attr_line(res, sp, path, ++lineno, macro_ok);
 434                 sp = ep + more;
 435         }
 436         free(buf);
 437         return res;
 438 }
 439
 440 static struct attr_stack *read_attr(const char *path, int macro_ok)
 441 {
 442         struct attr_stack *res;
 443
 444         if (direction == GIT_ATTR_CHECKOUT) {
 445                 res = read_attr_from_index(path, macro_ok);
 446                 if (!res)
 447                         res = read_attr_from_file(path, macro_ok);
 448         }
 449         else if (direction == GIT_ATTR_CHECKIN) {
 450                 res = read_attr_from_file(path, macro_ok);
 451                 if (!res)
 452                         /*
 453                          * There is no checked out .gitattributes file there, but
 454                          * we might have it in the index.  We allow operation in a
 455                          * sparsely checked out work tree, so read from it.
 456                          */
 457                         res = read_attr_from_index(path, macro_ok);
 458         }
 459         else
 460                 res = read_attr_from_index(path, macro_ok);
 461         if (!res)
 462                 res = xcalloc(1, sizeof(*res));
 463         return res;
 464 }
 465
 466 #if DEBUG_ATTR
 467 static void debug_info(const char *what, struct attr_stack *elem)
 468 {
 469         fprintf(stderr, "%s: %s\n", what, elem->origin ? elem->origin : "()");
 470 }
 471 static void debug_set(const char *what, const char *match, struct git_attr *attr, const void *v)
 472 {
 473         const char *value = v;
 474
 475         if (ATTR_TRUE(value))
 476                 value = "set";
 477         else if (ATTR_FALSE(value))
 478                 value = "unset";
 479         else if (ATTR_UNSET(value))
 480                 value = "unspecified";
 481
 482         fprintf(stderr, "%s: %s => %s (%s)\n",
 483                 what, attr->name, (char *) value, match);
 484 }
 485 #define debug_push(a) debug_info("push", (a))
 486 #define debug_pop(a) debug_info("pop", (a))
 487 #else
 488 #define debug_push(a) do { ; } while (0)
 489 #define debug_pop(a) do { ; } while (0)
 490 #define debug_set(a,b,c,d) do { ; } while (0)
 491 #endif
 492
 493 static void drop_attr_stack(void)
 494 {
 495         while (attr_stack) {
 496                 struct attr_stack *elem = attr_stack;
 497                 attr_stack = elem->prev;
 498                 free_attr_elem(elem);
 499         }
 500 }
 501
 502 static const char *git_etc_gitattributes(void)
 503 {
 504         static const char *system_wide;
 505         if (!system_wide)
 506                 system_wide = system_path(ETC_GITATTRIBUTES);
 507         return system_wide;
 508 }
 509
 510 static int git_attr_system(void)
 511 {
 512         return !git_env_bool("GIT_ATTR_NOSYSTEM", 0);
 513 }
 514
 515 static void bootstrap_attr_stack(void)
 516 {
 517         struct attr_stack *elem;
 518         char *xdg_attributes_file;
 519
 520         if (attr_stack)
 521                 return;
 522
 523         elem = read_attr_from_array(builtin_attr);
 524         elem->origin = NULL;
 525         elem->prev = attr_stack;
 526         attr_stack = elem;
 527
 528         if (git_attr_system()) {
 529                 elem = read_attr_from_file(git_etc_gitattributes(), 1);
 530                 if (elem) {
 531                         elem->origin = NULL;
 532                         elem->prev = attr_stack;
 533                         attr_stack = elem;
 534                 }
 535         }
 536
 537         if (!git_attributes_file) {
 538                 home_config_paths(NULL, &xdg_attributes_file, "attributes");
 539                 git_attributes_file = xdg_attributes_file;
 540         }
 541         if (git_attributes_file) {
 542                 elem = read_attr_from_file(git_attributes_file, 1);
 543                 if (elem) {
 544                         elem->origin = NULL;
 545                         elem->prev = attr_stack;
 546                         attr_stack = elem;
 547                 }
 548         }
 549
 550         if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
 551                 elem = read_attr(GITATTRIBUTES_FILE, 1);
 552                 elem->origin = xstrdup("");
 553                 elem->originlen = 0;
 554                 elem->prev = attr_stack;
 555                 attr_stack = elem;
 556                 debug_push(elem);
 557         }
 558
 559         elem = read_attr_from_file(git_path(INFOATTRIBUTES_FILE), 1);
 560         if (!elem)
 561                 elem = xcalloc(1, sizeof(*elem));
 562         elem->origin = NULL;
 563         elem->prev = attr_stack;
 564         attr_stack = elem;
 565 }
 566
 567 static const char *find_basename(const char *path)
 568 {
 569         const char *cp, *last_slash = NULL;
 570
 571         for (cp = path; *cp; cp++) {
 572                 if (*cp == '/' && cp[1])
 573                         last_slash = cp;
 574         }
 575         return last_slash ? last_slash + 1 : path;
 576 }
 577
 578 static void prepare_attr_stack(const char *path)
 579 {
 580         struct attr_stack *elem, *info;
 581         int dirlen, len;
 582         const char *cp;
 583
 584         dirlen = find_basename(path) - path;
 585
 586         /*
 587          * At the bottom of the attribute stack is the built-in
 588          * set of attribute definitions, followed by the contents
 589          * of $(prefix)/etc/gitattributes and a file specified by
 590          * core.attributesfile.  Then, contents from
 591          * .gitattribute files from directories closer to the
 592          * root to the ones in deeper directories are pushed
 593          * to the stack.  Finally, at the very top of the stack
 594          * we always keep the contents of $GIT_DIR/info/attributes.
 595          *
 596          * When checking, we use entries from near the top of the
 597          * stack, preferring $GIT_DIR/info/attributes, then
 598          * .gitattributes in deeper directories to shallower ones,
 599          * and finally use the built-in set as the default.
 600          */
 601         bootstrap_attr_stack();
 602
 603         /*
 604          * Pop the "info" one that is always at the top of the stack.
 605          */
 606         info = attr_stack;
 607         attr_stack = info->prev;
 608
 609         /*
 610          * Pop the ones from directories that are not the prefix of
 611          * the path we are checking. Break out of the loop when we see
 612          * the root one (whose origin is an empty string "") or the builtin
 613          * one (whose origin is NULL) without popping it.
 614          */
 615         while (attr_stack->origin) {
 616                 int namelen = strlen(attr_stack->origin);
 617
 618                 elem = attr_stack;
 619                 if (namelen <= dirlen &&
 620                     !strncmp(elem->origin, path, namelen) &&
 621                     (!namelen || path[namelen] == '/'))
 622                         break;
 623
 624                 debug_pop(elem);
 625                 attr_stack = elem->prev;
 626                 free_attr_elem(elem);
 627         }
 628
 629         /*
 630          * Read from parent directories and push them down
 631          */
 632         if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
 633                 /*
 634                  * bootstrap_attr_stack() should have added, and the
 635                  * above loop should have stopped before popping, the
 636                  * root element whose attr_stack->origin is set to an
 637                  * empty string.
 638                  */
 639                 struct strbuf pathbuf = STRBUF_INIT;
 640
 641                 assert(attr_stack->origin);
 642                 while (1) {
 643                         len = strlen(attr_stack->origin);
 644                         if (dirlen <= len)
 645                                 break;
 646                         cp = memchr(path + len + 1, '/', dirlen - len - 1);
 647                         if (!cp)
 648                                 cp = path + dirlen;
 649                         strbuf_add(&pathbuf, path, cp - path);
 650                         strbuf_addch(&pathbuf, '/');
 651                         strbuf_addstr(&pathbuf, GITATTRIBUTES_FILE);
 652                         elem = read_attr(pathbuf.buf, 0);
 653                         strbuf_setlen(&pathbuf, cp - path);
 654                         elem->origin = strbuf_detach(&pathbuf, &elem->originlen);
 655                         elem->prev = attr_stack;
 656                         attr_stack = elem;
 657                         debug_push(elem);
 658                 }
 659
 660                 strbuf_release(&pathbuf);
 661         }
 662
 663         /*
 664          * Finally push the "info" one at the top of the stack.
 665          */
 666         info->prev = attr_stack;
 667         attr_stack = info;
 668 }
 669
 670 static int path_matches(const char *pathname, int pathlen,
 671                         const char *basename,
 672                         const struct pattern *pat,
 673                         const char *base, int baselen)
 674 {
 675         const char *pattern = pat->pattern;
 676         int prefix = pat->nowildcardlen;
 677
 678         if ((pat->flags & EXC_FLAG_MUSTBEDIR) &&
 679             ((!pathlen) || (pathname[pathlen-1] != '/')))
 680                 return 0;
 681
 682         if (pat->flags & EXC_FLAG_NODIR) {
 683                 return match_basename(basename,
 684                                       pathlen - (basename - pathname),
 685                                       pattern, prefix,
 686                                       pat->patternlen, pat->flags);
 687         }
 688         return match_pathname(pathname, pathlen,
 689                               base, baselen,
 690                               pattern, prefix, pat->patternlen, pat->flags);
 691 }
 692
 693 static int macroexpand_one(int attr_nr, int rem);
 694
 695 static int fill_one(const char *what, struct match_attr *a, int rem)
 696 {
 697         struct git_attr_check *check = check_all_attr;
 698         int i;
 699
 700         for (i = a->num_attr - 1; 0 < rem && 0 <= i; i--) {
 701                 struct git_attr *attr = a->state[i].attr;
 702                 const char **n = &(check[attr->attr_nr].value);
 703                 const char *v = a->state[i].setto;
 704
 705                 if (*n == ATTR__UNKNOWN) {
 706                         debug_set(what,
 707                                   a->is_macro ? a->u.attr->name : a->u.pattern,
 708                                   attr, v);
 709                         *n = v;
 710                         rem--;
 711                         rem = macroexpand_one(attr->attr_nr, rem);
 712                 }
 713         }
 714         return rem;
 715 }
 716
 717 static int fill(const char *path, int pathlen, const char *basename,
 718                 struct attr_stack *stk, int rem)
 719 {
 720         int i;
 721         const char *base = stk->origin ? stk->origin : "";
 722
 723         for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) {
 724                 struct match_attr *a = stk->attrs[i];
 725                 if (a->is_macro)
 726                         continue;
 727                 if (path_matches(path, pathlen, basename,
 728                                  &a->u.pat, base, stk->originlen))
 729                         rem = fill_one("fill", a, rem);
 730         }
 731         return rem;
 732 }
 733
 734 static int macroexpand_one(int attr_nr, int rem)
 735 {
 736         struct attr_stack *stk;
 737         struct match_attr *a = NULL;
 738         int i;
 739
 740         if (check_all_attr[attr_nr].value != ATTR__TRUE)
 741                 return rem;
 742
 743         for (stk = attr_stack; !a && stk; stk = stk->prev)
 744                 for (i = stk->num_matches - 1; !a && 0 <= i; i--) {
 745                         struct match_attr *ma = stk->attrs[i];
 746                         if (!ma->is_macro)
 747                                 continue;
 748                         if (ma->u.attr->attr_nr == attr_nr)
 749                                 a = ma;
 750                 }
 751
 752         if (a)
 753                 rem = fill_one("expand", a, rem);
 754
 755         return rem;
 756 }
 757
 758 /*
 759  * Collect all attributes for path into the array pointed to by
 760  * check_all_attr.
 761  */
 762 static void collect_all_attrs(const char *path)
 763 {
 764         struct attr_stack *stk;
 765         int i, pathlen, rem;
 766         const char *basename;
 767
 768         prepare_attr_stack(path);
 769         for (i = 0; i < attr_nr; i++)
 770                 check_all_attr[i].value = ATTR__UNKNOWN;
 771
 772         basename = find_basename(path);
 773         pathlen = strlen(path);
 774         rem = attr_nr;
 775         for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
 776                 rem = fill(path, pathlen, basename, stk, rem);
 777 }
 778
 779 int git_check_attr(const char *path, int num, struct git_attr_check *check)
 780 {
 781         int i;
 782
 783         collect_all_attrs(path);
 784
 785         for (i = 0; i < num; i++) {
 786                 const char *value = check_all_attr[check[i].attr->attr_nr].value;
 787                 if (value == ATTR__UNKNOWN)
 788                         value = ATTR__UNSET;
 789                 check[i].value = value;
 790         }
 791
 792         return 0;
 793 }
 794
 795 int git_all_attrs(const char *path, int *num, struct git_attr_check **check)
 796 {
 797         int i, count, j;
 798
 799         collect_all_attrs(path);
 800
 801         /* Count the number of attributes that are set. */
 802         count = 0;
 803         for (i = 0; i < attr_nr; i++) {
 804                 const char *value = check_all_attr[i].value;
 805                 if (value != ATTR__UNSET && value != ATTR__UNKNOWN)
 806                         ++count;
 807         }
 808         *num = count;
 809         *check = xmalloc(sizeof(**check) * count);
 810         j = 0;
 811         for (i = 0; i < attr_nr; i++) {
 812                 const char *value = check_all_attr[i].value;
 813                 if (value != ATTR__UNSET && value != ATTR__UNKNOWN) {
 814                         (*check)[j].attr = check_all_attr[i].attr;
 815                         (*check)[j].value = value;
 816                         ++j;
 817                 }
 818         }
 819
 820         return 0;
 821 }
 822
 823 void git_attr_set_direction(enum git_attr_direction new, struct index_state *istate)
 824 {
 825         enum git_attr_direction old = direction;
 826
 827         if (is_bare_repository() && new != GIT_ATTR_INDEX)
 828                 die("BUG: non-INDEX attr direction in a bare repo");
 829
 830         direction = new;
 831         if (new != old)
 832                 drop_attr_stack();
 833         use_index = istate;
 834 }