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 #include "utf8.h"
  16
  17 const char git_attr__true[] = "(builtin)true";
  18 const char git_attr__false[] = "\0(builtin)false";
  19 static const char git_attr__unknown[] = "(builtin)unknown";
  20 #define ATTR__TRUE git_attr__true
  21 #define ATTR__FALSE git_attr__false
  22 #define ATTR__UNSET NULL
  23 #define ATTR__UNKNOWN git_attr__unknown
  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         int maybe_macro;
  37         int maybe_real;
  38         char name[FLEX_ARRAY];
  39 };
  40 static int attr_nr;
  41 static int cannot_trust_maybe_real;
  42
  43 static struct git_attr_check *check_all_attr;
  44 static struct git_attr *(git_attr_hash[HASHSIZE]);
  45
  46 const char *git_attr_name(const struct git_attr *attr)
  47 {
  48         return attr->name;
  49 }
  50
  51 static unsigned hash_name(const char *name, int namelen)
  52 {
  53         unsigned val = 0, c;
  54
  55         while (namelen--) {
  56                 c = *name++;
  57                 val = ((val << 7) | (val >> 22)) ^ c;
  58         }
  59         return val;
  60 }
  61
  62 static int invalid_attr_name(const char *name, int namelen)
  63 {
  64         /*
  65          * Attribute name cannot begin with '-' and must consist of
  66          * characters from [-A-Za-z0-9_.].
  67          */
  68         if (namelen <= 0 || *name == '-')
  69                 return -1;
  70         while (namelen--) {
  71                 char ch = *name++;
  72                 if (! (ch == '-' || ch == '.' || ch == '_' ||
  73                        ('0' <= ch && ch <= '9') ||
  74                        ('a' <= ch && ch <= 'z') ||
  75                        ('A' <= ch && ch <= 'Z')) )
  76                         return -1;
  77         }
  78         return 0;
  79 }
  80
  81 static struct git_attr *git_attr_internal(const char *name, int len)
  82 {
  83         unsigned hval = hash_name(name, len);
  84         unsigned pos = hval % HASHSIZE;
  85         struct git_attr *a;
  86
  87         for (a = git_attr_hash[pos]; a; a = a->next) {
  88                 if (a->h == hval &&
  89                     !memcmp(a->name, name, len) && !a->name[len])
  90                         return a;
  91         }
  92
  93         if (invalid_attr_name(name, len))
  94                 return NULL;
  95
  96         FLEX_ALLOC_MEM(a, name, name, len);
  97         a->h = hval;
  98         a->next = git_attr_hash[pos];
  99         a->attr_nr = attr_nr++;
 100         a->maybe_macro = 0;
 101         a->maybe_real = 0;
 102         git_attr_hash[pos] = a;
 103
 104         REALLOC_ARRAY(check_all_attr, attr_nr);
 105         check_all_attr[a->attr_nr].attr = a;
 106         check_all_attr[a->attr_nr].value = ATTR__UNKNOWN;
 107         return a;
 108 }
 109
 110 struct git_attr *git_attr(const char *name)
 111 {
 112         return git_attr_internal(name, strlen(name));
 113 }
 114
 115 /* What does a matched pattern decide? */
 116 struct attr_state {
 117         struct git_attr *attr;
 118         const char *setto;
 119 };
 120
 121 struct pattern {
 122         const char *pattern;
 123         int patternlen;
 124         int nowildcardlen;
 125         unsigned flags;         /* EXC_FLAG_* */
 126 };
 127
 128 /*
 129  * One rule, as from a .gitattributes file.
 130  *
 131  * If is_macro is true, then u.attr is a pointer to the git_attr being
 132  * defined.
 133  *
 134  * If is_macro is false, then u.pat is the filename pattern to which the
 135  * rule applies.
 136  *
 137  * In either case, num_attr is the number of attributes affected by
 138  * this rule, and state is an array listing them.  The attributes are
 139  * listed as they appear in the file (macros unexpanded).
 140  */
 141 struct match_attr {
 142         union {
 143                 struct pattern pat;
 144                 struct git_attr *attr;
 145         } u;
 146         char is_macro;
 147         unsigned num_attr;
 148         struct attr_state state[FLEX_ARRAY];
 149 };
 150
 151 static const char blank[] = " \t\r\n";
 152
 153 /*
 154  * Parse a whitespace-delimited attribute state (i.e., "attr",
 155  * "-attr", "!attr", or "attr=value") from the string starting at src.
 156  * If e is not NULL, write the results to *e.  Return a pointer to the
 157  * remainder of the string (with leading whitespace removed), or NULL
 158  * if there was an error.
 159  */
 160 static const char *parse_attr(const char *src, int lineno, const char *cp,
 161                               struct attr_state *e)
 162 {
 163         const char *ep, *equals;
 164         int len;
 165
 166         ep = cp + strcspn(cp, blank);
 167         equals = strchr(cp, '=');
 168         if (equals && ep < equals)
 169                 equals = NULL;
 170         if (equals)
 171                 len = equals - cp;
 172         else
 173                 len = ep - cp;
 174         if (!e) {
 175                 if (*cp == '-' || *cp == '!') {
 176                         cp++;
 177                         len--;
 178                 }
 179                 if (invalid_attr_name(cp, len)) {
 180                         fprintf(stderr,
 181                                 "%.*s is not a valid attribute name: %s:%d\n",
 182                                 len, cp, src, lineno);
 183                         return NULL;
 184                 }
 185         } else {
 186                 /*
 187                  * As this function is always called twice, once with
 188                  * e == NULL in the first pass and then e != NULL in
 189                  * the second pass, no need for invalid_attr_name()
 190                  * check here.
 191                  */
 192                 if (*cp == '-' || *cp == '!') {
 193                         e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET;
 194                         cp++;
 195                         len--;
 196                 }
 197                 else if (!equals)
 198                         e->setto = ATTR__TRUE;
 199                 else {
 200                         e->setto = xmemdupz(equals + 1, ep - equals - 1);
 201                 }
 202                 e->attr = git_attr_internal(cp, len);
 203         }
 204         return ep + strspn(ep, blank);
 205 }
 206
 207 static struct match_attr *parse_attr_line(const char *line, const char *src,
 208                                           int lineno, int macro_ok)
 209 {
 210         int namelen;
 211         int num_attr, i;
 212         const char *cp, *name, *states;
 213         struct match_attr *res = NULL;
 214         int is_macro;
 215
 216         cp = line + strspn(line, blank);
 217         if (!*cp || *cp == '#')
 218                 return NULL;
 219         name = cp;
 220         namelen = strcspn(name, blank);
 221         if (strlen(ATTRIBUTE_MACRO_PREFIX) < namelen &&
 222             starts_with(name, ATTRIBUTE_MACRO_PREFIX)) {
 223                 if (!macro_ok) {
 224                         fprintf(stderr, "%s not allowed: %s:%d\n",
 225                                 name, src, lineno);
 226                         return NULL;
 227                 }
 228                 is_macro = 1;
 229                 name += strlen(ATTRIBUTE_MACRO_PREFIX);
 230                 name += strspn(name, blank);
 231                 namelen = strcspn(name, blank);
 232                 if (invalid_attr_name(name, namelen)) {
 233                         fprintf(stderr,
 234                                 "%.*s is not a valid attribute name: %s:%d\n",
 235                                 namelen, name, src, lineno);
 236                         return NULL;
 237                 }
 238         }
 239         else
 240                 is_macro = 0;
 241
 242         states = name + namelen;
 243         states += strspn(states, blank);
 244
 245         /* First pass to count the attr_states */
 246         for (cp = states, num_attr = 0; *cp; num_attr++) {
 247                 cp = parse_attr(src, lineno, cp, NULL);
 248                 if (!cp)
 249                         return NULL;
 250         }
 251
 252         res = xcalloc(1,
 253                       sizeof(*res) +
 254                       sizeof(struct attr_state) * num_attr +
 255                       (is_macro ? 0 : namelen + 1));
 256         if (is_macro) {
 257                 res->u.attr = git_attr_internal(name, namelen);
 258                 res->u.attr->maybe_macro = 1;
 259         } else {
 260                 char *p = (char *)&(res->state[num_attr]);
 261                 memcpy(p, name, namelen);
 262                 res->u.pat.pattern = p;
 263                 parse_exclude_pattern(&res->u.pat.pattern,
 264                                       &res->u.pat.patternlen,
 265                                       &res->u.pat.flags,
 266                                       &res->u.pat.nowildcardlen);
 267                 if (res->u.pat.flags & EXC_FLAG_NEGATIVE) {
 268                         warning(_("Negative patterns are ignored in git attributes\n"
 269                                   "Use '\\!' for literal leading exclamation."));
 270                         return NULL;
 271                 }
 272         }
 273         res->is_macro = is_macro;
 274         res->num_attr = num_attr;
 275
 276         /* Second pass to fill the attr_states */
 277         for (cp = states, i = 0; *cp; i++) {
 278                 cp = parse_attr(src, lineno, cp, &(res->state[i]));
 279                 if (!is_macro)
 280                         res->state[i].attr->maybe_real = 1;
 281                 if (res->state[i].attr->maybe_macro)
 282                         cannot_trust_maybe_real = 1;
 283         }
 284
 285         return res;
 286 }
 287
 288 /*
 289  * Like info/exclude and .gitignore, the attribute information can
 290  * come from many places.
 291  *
 292  * (1) .gitattribute file of the same directory;
 293  * (2) .gitattribute file of the parent directory if (1) does not have
 294  *      any match; this goes recursively upwards, just like .gitignore.
 295  * (3) $GIT_DIR/info/attributes, which overrides both of the above.
 296  *
 297  * In the same file, later entries override the earlier match, so in the
 298  * global list, we would have entries from info/attributes the earliest
 299  * (reading the file from top to bottom), .gitattribute of the root
 300  * directory (again, reading the file from top to bottom) down to the
 301  * current directory, and then scan the list backwards to find the first match.
 302  * This is exactly the same as what is_excluded() does in dir.c to deal with
 303  * .gitignore file and info/excludes file as a fallback.
 304  */
 305
 306 static struct attr_stack {
 307         struct attr_stack *prev;
 308         char *origin;
 309         size_t originlen;
 310         unsigned num_matches;
 311         unsigned alloc;
 312         struct match_attr **attrs;
 313 } *attr_stack;
 314
 315 static void free_attr_elem(struct attr_stack *e)
 316 {
 317         int i;
 318         free(e->origin);
 319         for (i = 0; i < e->num_matches; i++) {
 320                 struct match_attr *a = e->attrs[i];
 321                 int j;
 322                 for (j = 0; j < a->num_attr; j++) {
 323                         const char *setto = a->state[j].setto;
 324                         if (setto == ATTR__TRUE ||
 325                             setto == ATTR__FALSE ||
 326                             setto == ATTR__UNSET ||
 327                             setto == ATTR__UNKNOWN)
 328                                 ;
 329                         else
 330                                 free((char *) setto);
 331                 }
 332                 free(a);
 333         }
 334         free(e->attrs);
 335         free(e);
 336 }
 337
 338 static const char *builtin_attr[] = {
 339         "[attr]binary -diff -merge -text",
 340         NULL,
 341 };
 342
 343 static void handle_attr_line(struct attr_stack *res,
 344                              const char *line,
 345                              const char *src,
 346                              int lineno,
 347                              int macro_ok)
 348 {
 349         struct match_attr *a;
 350
 351         a = parse_attr_line(line, src, lineno, macro_ok);
 352         if (!a)
 353                 return;
 354         ALLOC_GROW(res->attrs, res->num_matches + 1, res->alloc);
 355         res->attrs[res->num_matches++] = a;
 356 }
 357
 358 static struct attr_stack *read_attr_from_array(const char **list)
 359 {
 360         struct attr_stack *res;
 361         const char *line;
 362         int lineno = 0;
 363
 364         res = xcalloc(1, sizeof(*res));
 365         while ((line = *(list++)) != NULL)
 366                 handle_attr_line(res, line, "[builtin]", ++lineno, 1);
 367         return res;
 368 }
 369
 370 static enum git_attr_direction direction;
 371 static struct index_state *use_index;
 372
 373 static struct attr_stack *read_attr_from_file(const char *path, int macro_ok)
 374 {
 375         FILE *fp = fopen(path, "r");
 376         struct attr_stack *res;
 377         char buf[2048];
 378         int lineno = 0;
 379
 380         if (!fp) {
 381                 if (errno != ENOENT && errno != ENOTDIR)
 382                         warn_on_inaccessible(path);
 383                 return NULL;
 384         }
 385         res = xcalloc(1, sizeof(*res));
 386         while (fgets(buf, sizeof(buf), fp)) {
 387                 char *bufp = buf;
 388                 if (!lineno)
 389                         skip_utf8_bom(&bufp, strlen(bufp));
 390                 handle_attr_line(res, bufp, path, ++lineno, macro_ok);
 391         }
 392         fclose(fp);
 393         return res;
 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_blob_data_from_index(use_index ? use_index : &the_index, path, NULL);
 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
 411                 ep = strchrnul(sp, '\n');
 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 /* DEBUG_ATTR */
 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 GIT_PATH_FUNC(git_path_info_attributes, INFOATTRIBUTES_FILE)
 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                 git_attributes_file = xdg_config_home("attributes");
 521         if (git_attributes_file) {
 522                 elem = read_attr_from_file(git_attributes_file, 1);
 523                 if (elem) {
 524                         elem->origin = NULL;
 525                         elem->prev = attr_stack;
 526                         attr_stack = elem;
 527                 }
 528         }
 529
 530         if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
 531                 elem = read_attr(GITATTRIBUTES_FILE, 1);
 532                 elem->origin = xstrdup("");
 533                 elem->originlen = 0;
 534                 elem->prev = attr_stack;
 535                 attr_stack = elem;
 536                 debug_push(elem);
 537         }
 538
 539         if (startup_info->have_repository)
 540                 elem = read_attr_from_file(git_path_info_attributes(), 1);
 541         else
 542                 elem = NULL;
 543
 544         if (!elem)
 545                 elem = xcalloc(1, sizeof(*elem));
 546         elem->origin = NULL;
 547         elem->prev = attr_stack;
 548         attr_stack = elem;
 549 }
 550
 551 static void prepare_attr_stack(const char *path, int dirlen)
 552 {
 553         struct attr_stack *elem, *info;
 554         int len;
 555         const char *cp;
 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                         int basename_offset,
 643                         const struct pattern *pat,
 644                         const char *base, int baselen)
 645 {
 646         const char *pattern = pat->pattern;
 647         int prefix = pat->nowildcardlen;
 648         int isdir = (pathlen && pathname[pathlen - 1] == '/');
 649
 650         if ((pat->flags & EXC_FLAG_MUSTBEDIR) && !isdir)
 651                 return 0;
 652
 653         if (pat->flags & EXC_FLAG_NODIR) {
 654                 return match_basename(pathname + basename_offset,
 655                                       pathlen - basename_offset - isdir,
 656                                       pattern, prefix,
 657                                       pat->patternlen, pat->flags);
 658         }
 659         return match_pathname(pathname, pathlen - isdir,
 660                               base, baselen,
 661                               pattern, prefix, pat->patternlen, pat->flags);
 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.pat.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, int basename_offset,
 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_offset,
 699                                  &a->u.pat, base, stk->originlen))
 700                         rem = fill_one("fill", a, rem);
 701         }
 702         return rem;
 703 }
 704
 705 static int macroexpand_one(int nr, int rem)
 706 {
 707         struct attr_stack *stk;
 708         int i;
 709
 710         if (check_all_attr[nr].value != ATTR__TRUE ||
 711             !check_all_attr[nr].attr->maybe_macro)
 712                 return rem;
 713
 714         for (stk = attr_stack; stk; stk = stk->prev) {
 715                 for (i = stk->num_matches - 1; 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 == nr)
 720                                 return fill_one("expand", ma, rem);
 721                 }
 722         }
 723
 724         return rem;
 725 }
 726
 727 /*
 728  * Collect attributes for path into the array pointed to by
 729  * check_all_attr. If num is non-zero, only attributes in check[] are
 730  * collected. Otherwise all attributes are collected.
 731  */
 732 static void collect_some_attrs(const char *path, int num,
 733                                struct git_attr_check *check)
 734
 735 {
 736         struct attr_stack *stk;
 737         int i, pathlen, rem, dirlen;
 738         const char *cp, *last_slash = NULL;
 739         int basename_offset;
 740
 741         for (cp = path; *cp; cp++) {
 742                 if (*cp == '/' && cp[1])
 743                         last_slash = cp;
 744         }
 745         pathlen = cp - path;
 746         if (last_slash) {
 747                 basename_offset = last_slash + 1 - path;
 748                 dirlen = last_slash - path;
 749         } else {
 750                 basename_offset = 0;
 751                 dirlen = 0;
 752         }
 753
 754         prepare_attr_stack(path, dirlen);
 755         for (i = 0; i < attr_nr; i++)
 756                 check_all_attr[i].value = ATTR__UNKNOWN;
 757         if (num && !cannot_trust_maybe_real) {
 758                 rem = 0;
 759                 for (i = 0; i < num; i++) {
 760                         if (!check[i].attr->maybe_real) {
 761                                 struct git_attr_check *c;
 762                                 c = check_all_attr + check[i].attr->attr_nr;
 763                                 c->value = ATTR__UNSET;
 764                                 rem++;
 765                         }
 766                 }
 767                 if (rem == num)
 768                         return;
 769         }
 770
 771         rem = attr_nr;
 772         for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
 773                 rem = fill(path, pathlen, basename_offset, stk, rem);
 774 }
 775
 776 int git_check_attr(const char *path, int num, struct git_attr_check *check)
 777 {
 778         int i;
 779
 780         collect_some_attrs(path, num, check);
 781
 782         for (i = 0; i < num; i++) {
 783                 const char *value = check_all_attr[check[i].attr->attr_nr].value;
 784                 if (value == ATTR__UNKNOWN)
 785                         value = ATTR__UNSET;
 786                 check[i].value = value;
 787         }
 788
 789         return 0;
 790 }
 791
 792 int git_all_attrs(const char *path, int *num, struct git_attr_check **check)
 793 {
 794         int i, count, j;
 795
 796         collect_some_attrs(path, 0, NULL);
 797
 798         /* Count the number of attributes that are set. */
 799         count = 0;
 800         for (i = 0; i < attr_nr; i++) {
 801                 const char *value = check_all_attr[i].value;
 802                 if (value != ATTR__UNSET && value != ATTR__UNKNOWN)
 803                         ++count;
 804         }
 805         *num = count;
 806         ALLOC_ARRAY(*check, count);
 807         j = 0;
 808         for (i = 0; i < attr_nr; i++) {
 809                 const char *value = check_all_attr[i].value;
 810                 if (value != ATTR__UNSET && value != ATTR__UNKNOWN) {
 811                         (*check)[j].attr = check_all_attr[i].attr;
 812                         (*check)[j].value = value;
 813                         ++j;
 814                 }
 815         }
 816
 817         return 0;
 818 }
 819
 820 void git_attr_set_direction(enum git_attr_direction new, struct index_state *istate)
 821 {
 822         enum git_attr_direction old = direction;
 823
 824         if (is_bare_repository() && new != GIT_ATTR_INDEX)
 825                 die("BUG: non-INDEX attr direction in a bare repo");
 826
 827         direction = new;
 828         if (new != old)
 829                 drop_attr_stack();
 830         use_index = istate;
 831 }