fe38fcc36bcdbdfba5c06128aa41247125169e37
   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
  15const char git_attr__true[] = "(builtin)true";
  16const char git_attr__false[] = "\0(builtin)false";
  17static const char git_attr__unknown[] = "(builtin)unknown";
  18#define ATTR__TRUE git_attr__true
  19#define ATTR__FALSE git_attr__false
  20#define ATTR__UNSET NULL
  21#define ATTR__UNKNOWN git_attr__unknown
  22
  23static const char *attributes_file;
  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
  32struct git_attr {
  33        struct git_attr *next;
  34        unsigned h;
  35        int attr_nr;
  36        char name[FLEX_ARRAY];
  37};
  38static int attr_nr;
  39
  40static struct git_attr_check *check_all_attr;
  41static struct git_attr *(git_attr_hash[HASHSIZE]);
  42
  43char *git_attr_name(struct git_attr *attr)
  44{
  45        return attr->name;
  46}
  47
  48static 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
  59static 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
  78static 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        git_attr_hash[pos] = a;
 100
 101        check_all_attr = xrealloc(check_all_attr,
 102                                  sizeof(*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
 108struct 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? */
 114struct attr_state {
 115        struct git_attr *attr;
 116        const char *setto;
 117};
 118
 119/*
 120 * One rule, as from a .gitattributes file.
 121 *
 122 * If is_macro is true, then u.attr is a pointer to the git_attr being
 123 * defined.
 124 *
 125 * If is_macro is false, then u.pattern points at the filename pattern
 126 * to which the rule applies.  (The memory pointed to is part of the
 127 * memory block allocated for the match_attr instance.)
 128 *
 129 * In either case, num_attr is the number of attributes affected by
 130 * this rule, and state is an array listing them.  The attributes are
 131 * listed as they appear in the file (macros unexpanded).
 132 */
 133struct match_attr {
 134        union {
 135                char *pattern;
 136                struct git_attr *attr;
 137        } u;
 138        char is_macro;
 139        unsigned num_attr;
 140        struct attr_state state[FLEX_ARRAY];
 141};
 142
 143static const char blank[] = " \t\r\n";
 144
 145/*
 146 * Parse a whitespace-delimited attribute state (i.e., "attr",
 147 * "-attr", "!attr", or "attr=value") from the string starting at src.
 148 * If e is not NULL, write the results to *e.  Return a pointer to the
 149 * remainder of the string (with leading whitespace removed), or NULL
 150 * if there was an error.
 151 */
 152static const char *parse_attr(const char *src, int lineno, const char *cp,
 153                              struct attr_state *e)
 154{
 155        const char *ep, *equals;
 156        int len;
 157
 158        ep = cp + strcspn(cp, blank);
 159        equals = strchr(cp, '=');
 160        if (equals && ep < equals)
 161                equals = NULL;
 162        if (equals)
 163                len = equals - cp;
 164        else
 165                len = ep - cp;
 166        if (!e) {
 167                if (*cp == '-' || *cp == '!') {
 168                        cp++;
 169                        len--;
 170                }
 171                if (invalid_attr_name(cp, len)) {
 172                        fprintf(stderr,
 173                                "%.*s is not a valid attribute name: %s:%d\n",
 174                                len, cp, src, lineno);
 175                        return NULL;
 176                }
 177        } else {
 178                if (*cp == '-' || *cp == '!') {
 179                        e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET;
 180                        cp++;
 181                        len--;
 182                }
 183                else if (!equals)
 184                        e->setto = ATTR__TRUE;
 185                else {
 186                        e->setto = xmemdupz(equals + 1, ep - equals - 1);
 187                }
 188                e->attr = git_attr_internal(cp, len);
 189        }
 190        return ep + strspn(ep, blank);
 191}
 192
 193static struct match_attr *parse_attr_line(const char *line, const char *src,
 194                                          int lineno, int macro_ok)
 195{
 196        int namelen;
 197        int num_attr, i;
 198        const char *cp, *name, *states;
 199        struct match_attr *res = NULL;
 200        int is_macro;
 201
 202        cp = line + strspn(line, blank);
 203        if (!*cp || *cp == '#')
 204                return NULL;
 205        name = cp;
 206        namelen = strcspn(name, blank);
 207        if (strlen(ATTRIBUTE_MACRO_PREFIX) < namelen &&
 208            !prefixcmp(name, ATTRIBUTE_MACRO_PREFIX)) {
 209                if (!macro_ok) {
 210                        fprintf(stderr, "%s not allowed: %s:%d\n",
 211                                name, src, lineno);
 212                        return NULL;
 213                }
 214                is_macro = 1;
 215                name += strlen(ATTRIBUTE_MACRO_PREFIX);
 216                name += strspn(name, blank);
 217                namelen = strcspn(name, blank);
 218                if (invalid_attr_name(name, namelen)) {
 219                        fprintf(stderr,
 220                                "%.*s is not a valid attribute name: %s:%d\n",
 221                                namelen, name, src, lineno);
 222                        return NULL;
 223                }
 224        }
 225        else
 226                is_macro = 0;
 227
 228        states = name + namelen;
 229        states += strspn(states, blank);
 230
 231        /* First pass to count the attr_states */
 232        for (cp = states, num_attr = 0; *cp; num_attr++) {
 233                cp = parse_attr(src, lineno, cp, NULL);
 234                if (!cp)
 235                        return NULL;
 236        }
 237
 238        res = xcalloc(1,
 239                      sizeof(*res) +
 240                      sizeof(struct attr_state) * num_attr +
 241                      (is_macro ? 0 : namelen + 1));
 242        if (is_macro)
 243                res->u.attr = git_attr_internal(name, namelen);
 244        else {
 245                res->u.pattern = (char *)&(res->state[num_attr]);
 246                memcpy(res->u.pattern, name, namelen);
 247                res->u.pattern[namelen] = 0;
 248        }
 249        res->is_macro = is_macro;
 250        res->num_attr = num_attr;
 251
 252        /* Second pass to fill the attr_states */
 253        for (cp = states, i = 0; *cp; i++) {
 254                cp = parse_attr(src, lineno, cp, &(res->state[i]));
 255        }
 256
 257        return res;
 258}
 259
 260/*
 261 * Like info/exclude and .gitignore, the attribute information can
 262 * come from many places.
 263 *
 264 * (1) .gitattribute file of the same directory;
 265 * (2) .gitattribute file of the parent directory if (1) does not have
 266 *      any match; this goes recursively upwards, just like .gitignore.
 267 * (3) $GIT_DIR/info/attributes, which overrides both of the above.
 268 *
 269 * In the same file, later entries override the earlier match, so in the
 270 * global list, we would have entries from info/attributes the earliest
 271 * (reading the file from top to bottom), .gitattribute of the root
 272 * directory (again, reading the file from top to bottom) down to the
 273 * current directory, and then scan the list backwards to find the first match.
 274 * This is exactly the same as what excluded() does in dir.c to deal with
 275 * .gitignore
 276 */
 277
 278static struct attr_stack {
 279        struct attr_stack *prev;
 280        char *origin;
 281        unsigned num_matches;
 282        unsigned alloc;
 283        struct match_attr **attrs;
 284} *attr_stack;
 285
 286static 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);
 306}
 307
 308static const char *builtin_attr[] = {
 309        "[attr]binary -diff -text",
 310        NULL,
 311};
 312
 313static void handle_attr_line(struct attr_stack *res,
 314                             const char *line,
 315                             const char *src,
 316                             int lineno,
 317                             int macro_ok)
 318{
 319        struct match_attr *a;
 320
 321        a = parse_attr_line(line, src, lineno, macro_ok);
 322        if (!a)
 323                return;
 324        if (res->alloc <= res->num_matches) {
 325                res->alloc = alloc_nr(res->num_matches);
 326                res->attrs = xrealloc(res->attrs,
 327                                      sizeof(struct match_attr *) *
 328                                      res->alloc);
 329        }
 330        res->attrs[res->num_matches++] = a;
 331}
 332
 333static struct attr_stack *read_attr_from_array(const char **list)
 334{
 335        struct attr_stack *res;
 336        const char *line;
 337        int lineno = 0;
 338
 339        res = xcalloc(1, sizeof(*res));
 340        while ((line = *(list++)) != NULL)
 341                handle_attr_line(res, line, "[builtin]", ++lineno, 1);
 342        return res;
 343}
 344
 345static enum git_attr_direction direction;
 346static struct index_state *use_index;
 347
 348static struct attr_stack *read_attr_from_file(const char *path, int macro_ok)
 349{
 350        FILE *fp = fopen(path, "r");
 351        struct attr_stack *res;
 352        char buf[2048];
 353        int lineno = 0;
 354
 355        if (!fp)
 356                return NULL;
 357        res = xcalloc(1, sizeof(*res));
 358        while (fgets(buf, sizeof(buf), fp))
 359                handle_attr_line(res, buf, path, ++lineno, macro_ok);
 360        fclose(fp);
 361        return res;
 362}
 363
 364static void *read_index_data(const char *path)
 365{
 366        int pos, len;
 367        unsigned long sz;
 368        enum object_type type;
 369        void *data;
 370        struct index_state *istate = use_index ? use_index : &the_index;
 371
 372        len = strlen(path);
 373        pos = index_name_pos(istate, path, len);
 374        if (pos < 0) {
 375                /*
 376                 * We might be in the middle of a merge, in which
 377                 * case we would read stage #2 (ours).
 378                 */
 379                int i;
 380                for (i = -pos - 1;
 381                     (pos < 0 && i < istate->cache_nr &&
 382                      !strcmp(istate->cache[i]->name, path));
 383                     i++)
 384                        if (ce_stage(istate->cache[i]) == 2)
 385                                pos = i;
 386        }
 387        if (pos < 0)
 388                return NULL;
 389        data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz);
 390        if (!data || type != OBJ_BLOB) {
 391                free(data);
 392                return NULL;
 393        }
 394        return data;
 395}
 396
 397static struct attr_stack *read_attr_from_index(const char *path, int macro_ok)
 398{
 399        struct attr_stack *res;
 400        char *buf, *sp;
 401        int lineno = 0;
 402
 403        buf = read_index_data(path);
 404        if (!buf)
 405                return NULL;
 406
 407        res = xcalloc(1, sizeof(*res));
 408        for (sp = buf; *sp; ) {
 409                char *ep;
 410                int more;
 411                for (ep = sp; *ep && *ep != '\n'; ep++)
 412                        ;
 413                more = (*ep == '\n');
 414                *ep = '\0';
 415                handle_attr_line(res, sp, path, ++lineno, macro_ok);
 416                sp = ep + more;
 417        }
 418        free(buf);
 419        return res;
 420}
 421
 422static struct attr_stack *read_attr(const char *path, int macro_ok)
 423{
 424        struct attr_stack *res;
 425
 426        if (direction == GIT_ATTR_CHECKOUT) {
 427                res = read_attr_from_index(path, macro_ok);
 428                if (!res)
 429                        res = read_attr_from_file(path, macro_ok);
 430        }
 431        else if (direction == GIT_ATTR_CHECKIN) {
 432                res = read_attr_from_file(path, macro_ok);
 433                if (!res)
 434                        /*
 435                         * There is no checked out .gitattributes file there, but
 436                         * we might have it in the index.  We allow operation in a
 437                         * sparsely checked out work tree, so read from it.
 438                         */
 439                        res = read_attr_from_index(path, macro_ok);
 440        }
 441        else
 442                res = read_attr_from_index(path, macro_ok);
 443        if (!res)
 444                res = xcalloc(1, sizeof(*res));
 445        return res;
 446}
 447
 448#if DEBUG_ATTR
 449static void debug_info(const char *what, struct attr_stack *elem)
 450{
 451        fprintf(stderr, "%s: %s\n", what, elem->origin ? elem->origin : "()");
 452}
 453static void debug_set(const char *what, const char *match, struct git_attr *attr, const void *v)
 454{
 455        const char *value = v;
 456
 457        if (ATTR_TRUE(value))
 458                value = "set";
 459        else if (ATTR_FALSE(value))
 460                value = "unset";
 461        else if (ATTR_UNSET(value))
 462                value = "unspecified";
 463
 464        fprintf(stderr, "%s: %s => %s (%s)\n",
 465                what, attr->name, (char *) value, match);
 466}
 467#define debug_push(a) debug_info("push", (a))
 468#define debug_pop(a) debug_info("pop", (a))
 469#else
 470#define debug_push(a) do { ; } while (0)
 471#define debug_pop(a) do { ; } while (0)
 472#define debug_set(a,b,c,d) do { ; } while (0)
 473#endif
 474
 475static void drop_attr_stack(void)
 476{
 477        while (attr_stack) {
 478                struct attr_stack *elem = attr_stack;
 479                attr_stack = elem->prev;
 480                free_attr_elem(elem);
 481        }
 482}
 483
 484static const char *git_etc_gitattributes(void)
 485{
 486        static const char *system_wide;
 487        if (!system_wide)
 488                system_wide = system_path(ETC_GITATTRIBUTES);
 489        return system_wide;
 490}
 491
 492static int git_attr_system(void)
 493{
 494        return !git_env_bool("GIT_ATTR_NOSYSTEM", 0);
 495}
 496
 497static int git_attr_config(const char *var, const char *value, void *dummy)
 498{
 499        if (!strcmp(var, "core.attributesfile"))
 500                return git_config_pathname(&attributes_file, var, value);
 501
 502        return 0;
 503}
 504
 505static void bootstrap_attr_stack(void)
 506{
 507        if (!attr_stack) {
 508                struct attr_stack *elem;
 509
 510                elem = read_attr_from_array(builtin_attr);
 511                elem->origin = NULL;
 512                elem->prev = attr_stack;
 513                attr_stack = elem;
 514
 515                if (git_attr_system()) {
 516                        elem = read_attr_from_file(git_etc_gitattributes(), 1);
 517                        if (elem) {
 518                                elem->origin = NULL;
 519                                elem->prev = attr_stack;
 520                                attr_stack = elem;
 521                        }
 522                }
 523
 524                git_config(git_attr_config, NULL);
 525                if (attributes_file) {
 526                        elem = read_attr_from_file(attributes_file, 1);
 527                        if (elem) {
 528                                elem->origin = NULL;
 529                                elem->prev = attr_stack;
 530                                attr_stack = elem;
 531                        }
 532                }
 533
 534                if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
 535                        elem = read_attr(GITATTRIBUTES_FILE, 1);
 536                        elem->origin = strdup("");
 537                        elem->prev = attr_stack;
 538                        attr_stack = elem;
 539                        debug_push(elem);
 540                }
 541
 542                elem = read_attr_from_file(git_path(INFOATTRIBUTES_FILE), 1);
 543                if (!elem)
 544                        elem = xcalloc(1, sizeof(*elem));
 545                elem->origin = NULL;
 546                elem->prev = attr_stack;
 547                attr_stack = elem;
 548        }
 549}
 550
 551static void prepare_attr_stack(const char *path)
 552{
 553        struct attr_stack *elem, *info;
 554        int dirlen, len;
 555        const char *cp;
 556
 557        cp = strrchr(path, '/');
 558        if (!cp)
 559                dirlen = 0;
 560        else
 561                dirlen = cp - path;
 562
 563        /*
 564         * At the bottom of the attribute stack is the built-in
 565         * set of attribute definitions, followed by the contents
 566         * of $(prefix)/etc/gitattributes and a file specified by
 567         * core.attributesfile.  Then, contents from
 568         * .gitattribute files from directories closer to the
 569         * root to the ones in deeper directories are pushed
 570         * to the stack.  Finally, at the very top of the stack
 571         * we always keep the contents of $GIT_DIR/info/attributes.
 572         *
 573         * When checking, we use entries from near the top of the
 574         * stack, preferring $GIT_DIR/info/attributes, then
 575         * .gitattributes in deeper directories to shallower ones,
 576         * and finally use the built-in set as the default.
 577         */
 578        bootstrap_attr_stack();
 579
 580        /*
 581         * Pop the "info" one that is always at the top of the stack.
 582         */
 583        info = attr_stack;
 584        attr_stack = info->prev;
 585
 586        /*
 587         * Pop the ones from directories that are not the prefix of
 588         * the path we are checking.
 589         */
 590        while (attr_stack && attr_stack->origin) {
 591                int namelen = strlen(attr_stack->origin);
 592
 593                elem = attr_stack;
 594                if (namelen <= dirlen &&
 595                    !strncmp(elem->origin, path, namelen))
 596                        break;
 597
 598                debug_pop(elem);
 599                attr_stack = elem->prev;
 600                free_attr_elem(elem);
 601        }
 602
 603        /*
 604         * Read from parent directories and push them down
 605         */
 606        if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
 607                struct strbuf pathbuf = STRBUF_INIT;
 608
 609                while (1) {
 610                        len = strlen(attr_stack->origin);
 611                        if (dirlen <= len)
 612                                break;
 613                        cp = memchr(path + len + 1, '/', dirlen - len - 1);
 614                        if (!cp)
 615                                cp = path + dirlen;
 616                        strbuf_add(&pathbuf, path, cp - path);
 617                        strbuf_addch(&pathbuf, '/');
 618                        strbuf_addstr(&pathbuf, GITATTRIBUTES_FILE);
 619                        elem = read_attr(pathbuf.buf, 0);
 620                        strbuf_setlen(&pathbuf, cp - path);
 621                        elem->origin = strbuf_detach(&pathbuf, NULL);
 622                        elem->prev = attr_stack;
 623                        attr_stack = elem;
 624                        debug_push(elem);
 625                }
 626
 627                strbuf_release(&pathbuf);
 628        }
 629
 630        /*
 631         * Finally push the "info" one at the top of the stack.
 632         */
 633        info->prev = attr_stack;
 634        attr_stack = info;
 635}
 636
 637static int path_matches(const char *pathname, int pathlen,
 638                        const char *pattern,
 639                        const char *base, int baselen)
 640{
 641        if (!strchr(pattern, '/')) {
 642                /* match basename */
 643                const char *basename = strrchr(pathname, '/');
 644                basename = basename ? basename + 1 : pathname;
 645                return (fnmatch(pattern, basename, 0) == 0);
 646        }
 647        /*
 648         * match with FNM_PATHNAME; the pattern has base implicitly
 649         * in front of it.
 650         */
 651        if (*pattern == '/')
 652                pattern++;
 653        if (pathlen < baselen ||
 654            (baselen && pathname[baselen] != '/') ||
 655            strncmp(pathname, base, baselen))
 656                return 0;
 657        if (baselen != 0)
 658                baselen++;
 659        return fnmatch(pattern, pathname + baselen, FNM_PATHNAME) == 0;
 660}
 661
 662static int macroexpand_one(int attr_nr, int rem);
 663
 664static int fill_one(const char *what, struct match_attr *a, int rem)
 665{
 666        struct git_attr_check *check = check_all_attr;
 667        int i;
 668
 669        for (i = a->num_attr - 1; 0 < rem && 0 <= i; i--) {
 670                struct git_attr *attr = a->state[i].attr;
 671                const char **n = &(check[attr->attr_nr].value);
 672                const char *v = a->state[i].setto;
 673
 674                if (*n == ATTR__UNKNOWN) {
 675                        debug_set(what,
 676                                  a->is_macro ? a->u.attr->name : a->u.pattern,
 677                                  attr, v);
 678                        *n = v;
 679                        rem--;
 680                        rem = macroexpand_one(attr->attr_nr, rem);
 681                }
 682        }
 683        return rem;
 684}
 685
 686static int fill(const char *path, int pathlen, struct attr_stack *stk, int rem)
 687{
 688        int i;
 689        const char *base = stk->origin ? stk->origin : "";
 690
 691        for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) {
 692                struct match_attr *a = stk->attrs[i];
 693                if (a->is_macro)
 694                        continue;
 695                if (path_matches(path, pathlen,
 696                                 a->u.pattern, base, strlen(base)))
 697                        rem = fill_one("fill", a, rem);
 698        }
 699        return rem;
 700}
 701
 702static int macroexpand_one(int attr_nr, int rem)
 703{
 704        struct attr_stack *stk;
 705        struct match_attr *a = NULL;
 706        int i;
 707
 708        if (check_all_attr[attr_nr].value != ATTR__TRUE)
 709                return rem;
 710
 711        for (stk = attr_stack; !a && stk; stk = stk->prev)
 712                for (i = stk->num_matches - 1; !a && 0 <= i; i--) {
 713                        struct match_attr *ma = stk->attrs[i];
 714                        if (!ma->is_macro)
 715                                continue;
 716                        if (ma->u.attr->attr_nr == attr_nr)
 717                                a = ma;
 718                }
 719
 720        if (a)
 721                rem = fill_one("expand", a, rem);
 722
 723        return rem;
 724}
 725
 726/*
 727 * Collect all attributes for path into the array pointed to by
 728 * check_all_attr.
 729 */
 730static void collect_all_attrs(const char *path)
 731{
 732        struct attr_stack *stk;
 733        int i, pathlen, rem;
 734
 735        prepare_attr_stack(path);
 736        for (i = 0; i < attr_nr; i++)
 737                check_all_attr[i].value = ATTR__UNKNOWN;
 738
 739        pathlen = strlen(path);
 740        rem = attr_nr;
 741        for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
 742                rem = fill(path, pathlen, stk, rem);
 743}
 744
 745int 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
 761int 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
 789void 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}