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         int maybe_macro;
  36         char name[FLEX_ARRAY];
  37 };
  38 static int attr_nr;
  39
  40 static struct git_attr_check *check_all_attr;
  41 static struct git_attr *(git_attr_hash[HASHSIZE]);
  42
  43 char *git_attr_name(struct git_attr *attr)
  44 {
  45         return attr->name;
  46 }
  47
  48 static unsigned hash_name(const char *name, int namelen)
  49 {
  50         unsigned val = 0, c;
  51
  52         while (namelen--) {
  53                 c = *name++;
  54                 val = ((val << 7) | (val >> 22)) ^ c;
  55         }
  56         return val;
  57 }
  58
  59 static int invalid_attr_name(const char *name, int namelen)
  60 {
  61         /*
  62          * Attribute name cannot begin with '-' and must consist of
  63          * characters from [-A-Za-z0-9_.].
  64          */
  65         if (namelen <= 0 || *name == '-')
  66                 return -1;
  67         while (namelen--) {
  68                 char ch = *name++;
  69                 if (! (ch == '-' || ch == '.' || ch == '_' ||
  70                        ('0' <= ch && ch <= '9') ||
  71                        ('a' <= ch && ch <= 'z') ||
  72                        ('A' <= ch && ch <= 'Z')) )
  73                         return -1;
  74         }
  75         return 0;
  76 }
  77
  78 static struct git_attr *git_attr_internal(const char *name, int len)
  79 {
  80         unsigned hval = hash_name(name, len);
  81         unsigned pos = hval % HASHSIZE;
  82         struct git_attr *a;
  83
  84         for (a = git_attr_hash[pos]; a; a = a->next) {
  85                 if (a->h == hval &&
  86                     !memcmp(a->name, name, len) && !a->name[len])
  87                         return a;
  88         }
  89
  90         if (invalid_attr_name(name, len))
  91                 return NULL;
  92
  93         a = xmalloc(sizeof(*a) + len + 1);
  94         memcpy(a->name, name, len);
  95         a->name[len] = 0;
  96         a->h = hval;
  97         a->next = git_attr_hash[pos];
  98         a->attr_nr = attr_nr++;
  99         a->maybe_macro = 0;
 100         git_attr_hash[pos] = a;
 101
 102         REALLOC_ARRAY(check_all_attr, attr_nr);
 103         check_all_attr[a->attr_nr].attr = a;
 104         check_all_attr[a->attr_nr].value = ATTR__UNKNOWN;
 105         return a;
 106 }
 107
 108 struct git_attr *git_attr(const char *name)
 109 {
 110         return git_attr_internal(name, strlen(name));
 111 }
 112
 113 /* What does a matched pattern decide? */
 114 struct attr_state {
 115         struct git_attr *attr;
 116         const char *setto;
 117 };
 118
 119 struct pattern {
 120         const char *pattern;
 121         int patternlen;
 122         int nowildcardlen;
 123         int flags;              /* EXC_FLAG_* */
 124 };
 125
 126 /*
 127  * One rule, as from a .gitattributes file.
 128  *
 129  * If is_macro is true, then u.attr is a pointer to the git_attr being
 130  * defined.
 131  *
 132  * If is_macro is false, then u.pattern points at the filename pattern
 133  * to which the rule applies.  (The memory pointed to is part of the
 134  * memory block allocated for the match_attr instance.)
 135  *
 136  * In either case, num_attr is the number of attributes affected by
 137  * this rule, and state is an array listing them.  The attributes are
 138  * listed as they appear in the file (macros unexpanded).
 139  */
 140 struct match_attr {
 141         union {
 142                 struct pattern pat;
 143                 struct git_attr *attr;
 144         } u;
 145         char is_macro;
 146         unsigned num_attr;
 147         struct attr_state state[FLEX_ARRAY];
 148 };
 149
 150 static const char blank[] = " \t\r\n";
 151
 152 /*
 153  * Parse a whitespace-delimited attribute state (i.e., "attr",
 154  * "-attr", "!attr", or "attr=value") from the string starting at src.
 155  * If e is not NULL, write the results to *e.  Return a pointer to the
 156  * remainder of the string (with leading whitespace removed), or NULL
 157  * if there was an error.
 158  */
 159 static const char *parse_attr(const char *src, int lineno, const char *cp,
 160                               struct attr_state *e)
 161 {
 162         const char *ep, *equals;
 163         int len;
 164
 165         ep = cp + strcspn(cp, blank);
 166         equals = strchr(cp, '=');
 167         if (equals && ep < equals)
 168                 equals = NULL;
 169         if (equals)
 170                 len = equals - cp;
 171         else
 172                 len = ep - cp;
 173         if (!e) {
 174                 if (*cp == '-' || *cp == '!') {
 175                         cp++;
 176                         len--;
 177                 }
 178                 if (invalid_attr_name(cp, len)) {
 179                         fprintf(stderr,
 180                                 "%.*s is not a valid attribute name: %s:%d\n",
 181                                 len, cp, src, lineno);
 182                         return NULL;
 183                 }
 184         } else {
 185                 if (*cp == '-' || *cp == '!') {
 186                         e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET;
 187                         cp++;
 188                         len--;
 189                 }
 190                 else if (!equals)
 191                         e->setto = ATTR__TRUE;
 192                 else {
 193                         e->setto = xmemdupz(equals + 1, ep - equals - 1);
 194                 }
 195                 e->attr = git_attr_internal(cp, len);
 196         }
 197         return ep + strspn(ep, blank);
 198 }
 199
 200 static struct match_attr *parse_attr_line(const char *line, const char *src,
 201                                           int lineno, int macro_ok)
 202 {
 203         int namelen;
 204         int num_attr, i;
 205         const char *cp, *name, *states;
 206         struct match_attr *res = NULL;
 207         int is_macro;
 208
 209         cp = line + strspn(line, blank);
 210         if (!*cp || *cp == '#')
 211                 return NULL;
 212         name = cp;
 213         namelen = strcspn(name, blank);
 214         if (strlen(ATTRIBUTE_MACRO_PREFIX) < namelen &&
 215             starts_with(name, ATTRIBUTE_MACRO_PREFIX)) {
 216                 if (!macro_ok) {
 217                         fprintf(stderr, "%s not allowed: %s:%d\n",
 218                                 name, src, lineno);
 219                         return NULL;
 220                 }
 221                 is_macro = 1;
 222                 name += strlen(ATTRIBUTE_MACRO_PREFIX);
 223                 name += strspn(name, blank);
 224                 namelen = strcspn(name, blank);
 225                 if (invalid_attr_name(name, namelen)) {
 226                         fprintf(stderr,
 227                                 "%.*s is not a valid attribute name: %s:%d\n",
 228                                 namelen, name, src, lineno);
 229                         return NULL;
 230                 }
 231         }
 232         else
 233                 is_macro = 0;
 234
 235         states = name + namelen;
 236         states += strspn(states, blank);
 237
 238         /* First pass to count the attr_states */
 239         for (cp = states, num_attr = 0; *cp; num_attr++) {
 240                 cp = parse_attr(src, lineno, cp, NULL);
 241                 if (!cp)
 242                         return NULL;
 243         }
 244
 245         res = xcalloc(1,
 246                       sizeof(*res) +
 247                       sizeof(struct attr_state) * num_attr +
 248                       (is_macro ? 0 : namelen + 1));
 249         if (is_macro) {
 250                 res->u.attr = git_attr_internal(name, namelen);
 251                 res->u.attr->maybe_macro = 1;
 252         } else {
 253                 char *p = (char *)&(res->state[num_attr]);
 254                 memcpy(p, name, namelen);
 255                 res->u.pat.pattern = p;
 256                 parse_exclude_pattern(&res->u.pat.pattern,
 257                                       &res->u.pat.patternlen,
 258                                       &res->u.pat.flags,
 259                                       &res->u.pat.nowildcardlen);
 260                 if (res->u.pat.flags & EXC_FLAG_NEGATIVE) {
 261                         warning(_("Negative patterns are ignored in git attributes\n"
 262                                   "Use '\\!' for literal leading exclamation."));
 263                         return NULL;
 264                 }
 265         }
 266         res->is_macro = is_macro;
 267         res->num_attr = num_attr;
 268
 269         /* Second pass to fill the attr_states */
 270         for (cp = states, i = 0; *cp; i++) {
 271                 cp = parse_attr(src, lineno, cp, &(res->state[i]));
 272         }
 273
 274         return res;
 275 }
 276
 277 /*
 278  * Like info/exclude and .gitignore, the attribute information can
 279  * come from many places.
 280  *
 281  * (1) .gitattribute file of the same directory;
 282  * (2) .gitattribute file of the parent directory if (1) does not have
 283  *      any match; this goes recursively upwards, just like .gitignore.
 284  * (3) $GIT_DIR/info/attributes, which overrides both of the above.
 285  *
 286  * In the same file, later entries override the earlier match, so in the
 287  * global list, we would have entries from info/attributes the earliest
 288  * (reading the file from top to bottom), .gitattribute of the root
 289  * directory (again, reading the file from top to bottom) down to the
 290  * current directory, and then scan the list backwards to find the first match.
 291  * This is exactly the same as what is_excluded() does in dir.c to deal with
 292  * .gitignore
 293  */
 294
 295 static struct attr_stack {
 296         struct attr_stack *prev;
 297         char *origin;
 298         size_t originlen;
 299         unsigned num_matches;
 300         unsigned alloc;
 301         struct match_attr **attrs;
 302 } *attr_stack;
 303
 304 static void free_attr_elem(struct attr_stack *e)
 305 {
 306         int i;
 307         free(e->origin);
 308         for (i = 0; i < e->num_matches; i++) {
 309                 struct match_attr *a = e->attrs[i];
 310                 int j;
 311                 for (j = 0; j < a->num_attr; j++) {
 312                         const char *setto = a->state[j].setto;
 313                         if (setto == ATTR__TRUE ||
 314                             setto == ATTR__FALSE ||
 315                             setto == ATTR__UNSET ||
 316                             setto == ATTR__UNKNOWN)
 317                                 ;
 318                         else
 319                                 free((char *) setto);
 320                 }
 321                 free(a);
 322         }
 323         free(e->attrs);
 324         free(e);
 325 }
 326
 327 static const char *builtin_attr[] = {
 328         "[attr]binary -diff -merge -text",
 329         NULL,
 330 };
 331
 332 static void handle_attr_line(struct attr_stack *res,
 333                              const char *line,
 334                              const char *src,
 335                              int lineno,
 336                              int macro_ok)
 337 {
 338         struct match_attr *a;
 339
 340         a = parse_attr_line(line, src, lineno, macro_ok);
 341         if (!a)
 342                 return;
 343         ALLOC_GROW(res->attrs, res->num_matches + 1, res->alloc);
 344         res->attrs[res->num_matches++] = a;
 345 }
 346
 347 static struct attr_stack *read_attr_from_array(const char **list)
 348 {
 349         struct attr_stack *res;
 350         const char *line;
 351         int lineno = 0;
 352
 353         res = xcalloc(1, sizeof(*res));
 354         while ((line = *(list++)) != NULL)
 355                 handle_attr_line(res, line, "[builtin]", ++lineno, 1);
 356         return res;
 357 }
 358
 359 static enum git_attr_direction direction;
 360 static struct index_state *use_index;
 361
 362 static struct attr_stack *read_attr_from_file(const char *path, int macro_ok)
 363 {
 364         FILE *fp = fopen(path, "r");
 365         struct attr_stack *res;
 366         char buf[2048];
 367         int lineno = 0;
 368
 369         if (!fp) {
 370                 if (errno != ENOENT && errno != ENOTDIR)
 371                         warn_on_inaccessible(path);
 372                 return NULL;
 373         }
 374         res = xcalloc(1, sizeof(*res));
 375         while (fgets(buf, sizeof(buf), fp))
 376                 handle_attr_line(res, buf, path, ++lineno, macro_ok);
 377         fclose(fp);
 378         return res;
 379 }
 380
 381 static struct attr_stack *read_attr_from_index(const char *path, int macro_ok)
 382 {
 383         struct attr_stack *res;
 384         char *buf, *sp;
 385         int lineno = 0;
 386
 387         buf = read_blob_data_from_index(use_index ? use_index : &the_index, path, NULL);
 388         if (!buf)
 389                 return NULL;
 390
 391         res = xcalloc(1, sizeof(*res));
 392         for (sp = buf; *sp; ) {
 393                 char *ep;
 394                 int more;
 395                 for (ep = sp; *ep && *ep != '\n'; ep++)
 396                         ;
 397                 more = (*ep == '\n');
 398                 *ep = '\0';
 399                 handle_attr_line(res, sp, path, ++lineno, macro_ok);
 400                 sp = ep + more;
 401         }
 402         free(buf);
 403         return res;
 404 }
 405
 406 static struct attr_stack *read_attr(const char *path, int macro_ok)
 407 {
 408         struct attr_stack *res;
 409
 410         if (direction == GIT_ATTR_CHECKOUT) {
 411                 res = read_attr_from_index(path, macro_ok);
 412                 if (!res)
 413                         res = read_attr_from_file(path, macro_ok);
 414         }
 415         else if (direction == GIT_ATTR_CHECKIN) {
 416                 res = read_attr_from_file(path, macro_ok);
 417                 if (!res)
 418                         /*
 419                          * There is no checked out .gitattributes file there, but
 420                          * we might have it in the index.  We allow operation in a
 421                          * sparsely checked out work tree, so read from it.
 422                          */
 423                         res = read_attr_from_index(path, macro_ok);
 424         }
 425         else
 426                 res = read_attr_from_index(path, macro_ok);
 427         if (!res)
 428                 res = xcalloc(1, sizeof(*res));
 429         return res;
 430 }
 431
 432 #if DEBUG_ATTR
 433 static void debug_info(const char *what, struct attr_stack *elem)
 434 {
 435         fprintf(stderr, "%s: %s\n", what, elem->origin ? elem->origin : "()");
 436 }
 437 static void debug_set(const char *what, const char *match, struct git_attr *attr, const void *v)
 438 {
 439         const char *value = v;
 440
 441         if (ATTR_TRUE(value))
 442                 value = "set";
 443         else if (ATTR_FALSE(value))
 444                 value = "unset";
 445         else if (ATTR_UNSET(value))
 446                 value = "unspecified";
 447
 448         fprintf(stderr, "%s: %s => %s (%s)\n",
 449                 what, attr->name, (char *) value, match);
 450 }
 451 #define debug_push(a) debug_info("push", (a))
 452 #define debug_pop(a) debug_info("pop", (a))
 453 #else
 454 #define debug_push(a) do { ; } while (0)
 455 #define debug_pop(a) do { ; } while (0)
 456 #define debug_set(a,b,c,d) do { ; } while (0)
 457 #endif
 458
 459 static void drop_attr_stack(void)
 460 {
 461         while (attr_stack) {
 462                 struct attr_stack *elem = attr_stack;
 463                 attr_stack = elem->prev;
 464                 free_attr_elem(elem);
 465         }
 466 }
 467
 468 static const char *git_etc_gitattributes(void)
 469 {
 470         static const char *system_wide;
 471         if (!system_wide)
 472                 system_wide = system_path(ETC_GITATTRIBUTES);
 473         return system_wide;
 474 }
 475
 476 static int git_attr_system(void)
 477 {
 478         return !git_env_bool("GIT_ATTR_NOSYSTEM", 0);
 479 }
 480
 481 static void bootstrap_attr_stack(void)
 482 {
 483         struct attr_stack *elem;
 484         char *xdg_attributes_file;
 485
 486         if (attr_stack)
 487                 return;
 488
 489         elem = read_attr_from_array(builtin_attr);
 490         elem->origin = NULL;
 491         elem->prev = attr_stack;
 492         attr_stack = elem;
 493
 494         if (git_attr_system()) {
 495                 elem = read_attr_from_file(git_etc_gitattributes(), 1);
 496                 if (elem) {
 497                         elem->origin = NULL;
 498                         elem->prev = attr_stack;
 499                         attr_stack = elem;
 500                 }
 501         }
 502
 503         if (!git_attributes_file) {
 504                 home_config_paths(NULL, &xdg_attributes_file, "attributes");
 505                 git_attributes_file = xdg_attributes_file;
 506         }
 507         if (git_attributes_file) {
 508                 elem = read_attr_from_file(git_attributes_file, 1);
 509                 if (elem) {
 510                         elem->origin = NULL;
 511                         elem->prev = attr_stack;
 512                         attr_stack = elem;
 513                 }
 514         }
 515
 516         if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
 517                 elem = read_attr(GITATTRIBUTES_FILE, 1);
 518                 elem->origin = xstrdup("");
 519                 elem->originlen = 0;
 520                 elem->prev = attr_stack;
 521                 attr_stack = elem;
 522                 debug_push(elem);
 523         }
 524
 525         elem = read_attr_from_file(git_path(INFOATTRIBUTES_FILE), 1);
 526         if (!elem)
 527                 elem = xcalloc(1, sizeof(*elem));
 528         elem->origin = NULL;
 529         elem->prev = attr_stack;
 530         attr_stack = elem;
 531 }
 532
 533 static void prepare_attr_stack(const char *path, int dirlen)
 534 {
 535         struct attr_stack *elem, *info;
 536         int len;
 537         const char *cp;
 538
 539         /*
 540          * At the bottom of the attribute stack is the built-in
 541          * set of attribute definitions, followed by the contents
 542          * of $(prefix)/etc/gitattributes and a file specified by
 543          * core.attributesfile.  Then, contents from
 544          * .gitattribute files from directories closer to the
 545          * root to the ones in deeper directories are pushed
 546          * to the stack.  Finally, at the very top of the stack
 547          * we always keep the contents of $GIT_DIR/info/attributes.
 548          *
 549          * When checking, we use entries from near the top of the
 550          * stack, preferring $GIT_DIR/info/attributes, then
 551          * .gitattributes in deeper directories to shallower ones,
 552          * and finally use the built-in set as the default.
 553          */
 554         bootstrap_attr_stack();
 555
 556         /*
 557          * Pop the "info" one that is always at the top of the stack.
 558          */
 559         info = attr_stack;
 560         attr_stack = info->prev;
 561
 562         /*
 563          * Pop the ones from directories that are not the prefix of
 564          * the path we are checking. Break out of the loop when we see
 565          * the root one (whose origin is an empty string "") or the builtin
 566          * one (whose origin is NULL) without popping it.
 567          */
 568         while (attr_stack->origin) {
 569                 int namelen = strlen(attr_stack->origin);
 570
 571                 elem = attr_stack;
 572                 if (namelen <= dirlen &&
 573                     !strncmp(elem->origin, path, namelen) &&
 574                     (!namelen || path[namelen] == '/'))
 575                         break;
 576
 577                 debug_pop(elem);
 578                 attr_stack = elem->prev;
 579                 free_attr_elem(elem);
 580         }
 581
 582         /*
 583          * Read from parent directories and push them down
 584          */
 585         if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
 586                 /*
 587                  * bootstrap_attr_stack() should have added, and the
 588                  * above loop should have stopped before popping, the
 589                  * root element whose attr_stack->origin is set to an
 590                  * empty string.
 591                  */
 592                 struct strbuf pathbuf = STRBUF_INIT;
 593
 594                 assert(attr_stack->origin);
 595                 while (1) {
 596                         len = strlen(attr_stack->origin);
 597                         if (dirlen <= len)
 598                                 break;
 599                         cp = memchr(path + len + 1, '/', dirlen - len - 1);
 600                         if (!cp)
 601                                 cp = path + dirlen;
 602                         strbuf_add(&pathbuf, path, cp - path);
 603                         strbuf_addch(&pathbuf, '/');
 604                         strbuf_addstr(&pathbuf, GITATTRIBUTES_FILE);
 605                         elem = read_attr(pathbuf.buf, 0);
 606                         strbuf_setlen(&pathbuf, cp - path);
 607                         elem->origin = strbuf_detach(&pathbuf, &elem->originlen);
 608                         elem->prev = attr_stack;
 609                         attr_stack = elem;
 610                         debug_push(elem);
 611                 }
 612
 613                 strbuf_release(&pathbuf);
 614         }
 615
 616         /*
 617          * Finally push the "info" one at the top of the stack.
 618          */
 619         info->prev = attr_stack;
 620         attr_stack = info;
 621 }
 622
 623 static int path_matches(const char *pathname, int pathlen,
 624                         int basename_offset,
 625                         const struct pattern *pat,
 626                         const char *base, int baselen)
 627 {
 628         const char *pattern = pat->pattern;
 629         int prefix = pat->nowildcardlen;
 630         int isdir = (pathlen && pathname[pathlen - 1] == '/');
 631
 632         if ((pat->flags & EXC_FLAG_MUSTBEDIR) && !isdir)
 633                 return 0;
 634
 635         if (pat->flags & EXC_FLAG_NODIR) {
 636                 return match_basename(pathname + basename_offset,
 637                                       pathlen - basename_offset - isdir,
 638                                       pattern, prefix,
 639                                       pat->patternlen, pat->flags);
 640         }
 641         return match_pathname(pathname, pathlen - isdir,
 642                               base, baselen,
 643                               pattern, prefix, pat->patternlen, pat->flags);
 644 }
 645
 646 static int macroexpand_one(int attr_nr, int rem);
 647
 648 static int fill_one(const char *what, struct match_attr *a, int rem)
 649 {
 650         struct git_attr_check *check = check_all_attr;
 651         int i;
 652
 653         for (i = a->num_attr - 1; 0 < rem && 0 <= i; i--) {
 654                 struct git_attr *attr = a->state[i].attr;
 655                 const char **n = &(check[attr->attr_nr].value);
 656                 const char *v = a->state[i].setto;
 657
 658                 if (*n == ATTR__UNKNOWN) {
 659                         debug_set(what,
 660                                   a->is_macro ? a->u.attr->name : a->u.pat.pattern,
 661                                   attr, v);
 662                         *n = v;
 663                         rem--;
 664                         rem = macroexpand_one(attr->attr_nr, rem);
 665                 }
 666         }
 667         return rem;
 668 }
 669
 670 static int fill(const char *path, int pathlen, int basename_offset,
 671                 struct attr_stack *stk, int rem)
 672 {
 673         int i;
 674         const char *base = stk->origin ? stk->origin : "";
 675
 676         for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) {
 677                 struct match_attr *a = stk->attrs[i];
 678                 if (a->is_macro)
 679                         continue;
 680                 if (path_matches(path, pathlen, basename_offset,
 681                                  &a->u.pat, base, stk->originlen))
 682                         rem = fill_one("fill", a, rem);
 683         }
 684         return rem;
 685 }
 686
 687 static int macroexpand_one(int nr, int rem)
 688 {
 689         struct attr_stack *stk;
 690         struct match_attr *a = NULL;
 691         int i;
 692
 693         if (check_all_attr[nr].value != ATTR__TRUE ||
 694             !check_all_attr[nr].attr->maybe_macro)
 695                 return rem;
 696
 697         for (stk = attr_stack; !a && stk; stk = stk->prev)
 698                 for (i = stk->num_matches - 1; !a && 0 <= i; i--) {
 699                         struct match_attr *ma = stk->attrs[i];
 700                         if (!ma->is_macro)
 701                                 continue;
 702                         if (ma->u.attr->attr_nr == nr)
 703                                 a = ma;
 704                 }
 705
 706         if (a)
 707                 rem = fill_one("expand", a, rem);
 708
 709         return rem;
 710 }
 711
 712 /*
 713  * Collect all attributes for path into the array pointed to by
 714  * check_all_attr.
 715  */
 716 static void collect_all_attrs(const char *path)
 717 {
 718         struct attr_stack *stk;
 719         int i, pathlen, rem, dirlen;
 720         const char *cp, *last_slash = NULL;
 721         int basename_offset;
 722
 723         for (cp = path; *cp; cp++) {
 724                 if (*cp == '/' && cp[1])
 725                         last_slash = cp;
 726         }
 727         pathlen = cp - path;
 728         if (last_slash) {
 729                 basename_offset = last_slash + 1 - path;
 730                 dirlen = last_slash - path;
 731         } else {
 732                 basename_offset = 0;
 733                 dirlen = 0;
 734         }
 735
 736         prepare_attr_stack(path, dirlen);
 737         for (i = 0; i < attr_nr; i++)
 738                 check_all_attr[i].value = ATTR__UNKNOWN;
 739
 740         rem = attr_nr;
 741         for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
 742                 rem = fill(path, pathlen, basename_offset, stk, rem);
 743 }
 744
 745 int git_check_attr(const char *path, int num, struct git_attr_check *check)
 746 {
 747         int i;
 748
 749         collect_all_attrs(path);
 750
 751         for (i = 0; i < num; i++) {
 752                 const char *value = check_all_attr[check[i].attr->attr_nr].value;
 753                 if (value == ATTR__UNKNOWN)
 754                         value = ATTR__UNSET;
 755                 check[i].value = value;
 756         }
 757
 758         return 0;
 759 }
 760
 761 int git_all_attrs(const char *path, int *num, struct git_attr_check **check)
 762 {
 763         int i, count, j;
 764
 765         collect_all_attrs(path);
 766
 767         /* Count the number of attributes that are set. */
 768         count = 0;
 769         for (i = 0; i < attr_nr; i++) {
 770                 const char *value = check_all_attr[i].value;
 771                 if (value != ATTR__UNSET && value != ATTR__UNKNOWN)
 772                         ++count;
 773         }
 774         *num = count;
 775         *check = xmalloc(sizeof(**check) * count);
 776         j = 0;
 777         for (i = 0; i < attr_nr; i++) {
 778                 const char *value = check_all_attr[i].value;
 779                 if (value != ATTR__UNSET && value != ATTR__UNKNOWN) {
 780                         (*check)[j].attr = check_all_attr[i].attr;
 781                         (*check)[j].value = value;
 782                         ++j;
 783                 }
 784         }
 785
 786         return 0;
 787 }
 788
 789 void git_attr_set_direction(enum git_attr_direction new, struct index_state *istate)
 790 {
 791         enum git_attr_direction old = direction;
 792
 793         if (is_bare_repository() && new != GIT_ATTR_INDEX)
 794                 die("BUG: non-INDEX attr direction in a bare repo");
 795
 796         direction = new;
 797         if (new != old)
 798                 drop_attr_stack();
 799         use_index = istate;
 800 }