dir.con commit Merge branch 'sp/fix-smart-http-deadlock-on-error' (1c80c9b)
   1/*
   2 * This handles recursive filename detection with exclude
   3 * files, index knowledge etc..
   4 *
   5 * Copyright (C) Linus Torvalds, 2005-2006
   6 *               Junio Hamano, 2005-2006
   7 */
   8#include "cache.h"
   9#include "dir.h"
  10#include "refs.h"
  11
  12struct path_simplify {
  13        int len;
  14        const char *path;
  15};
  16
  17static int read_directory_recursive(struct dir_struct *dir, const char *path, int len,
  18        int check_only, const struct path_simplify *simplify);
  19static int get_dtype(struct dirent *de, const char *path, int len);
  20
  21static int common_prefix(const char **pathspec)
  22{
  23        const char *path, *slash, *next;
  24        int prefix;
  25
  26        if (!pathspec)
  27                return 0;
  28
  29        path = *pathspec;
  30        slash = strrchr(path, '/');
  31        if (!slash)
  32                return 0;
  33
  34        /*
  35         * The first 'prefix' characters of 'path' are common leading
  36         * path components among the pathspecs we have seen so far,
  37         * including the trailing slash.
  38         */
  39        prefix = slash - path + 1;
  40        while ((next = *++pathspec) != NULL) {
  41                int len, last_matching_slash = -1;
  42                for (len = 0; len < prefix && next[len] == path[len]; len++)
  43                        if (next[len] == '/')
  44                                last_matching_slash = len;
  45                if (len == prefix)
  46                        continue;
  47                if (last_matching_slash < 0)
  48                        return 0;
  49                prefix = last_matching_slash + 1;
  50        }
  51        return prefix;
  52}
  53
  54int fill_directory(struct dir_struct *dir, const char **pathspec)
  55{
  56        const char *path;
  57        int len;
  58
  59        /*
  60         * Calculate common prefix for the pathspec, and
  61         * use that to optimize the directory walk
  62         */
  63        len = common_prefix(pathspec);
  64        path = "";
  65
  66        if (len)
  67                path = xmemdupz(*pathspec, len);
  68
  69        /* Read the directory and prune it */
  70        read_directory(dir, path, len, pathspec);
  71        return len;
  72}
  73
  74/*
  75 * Does 'match' match the given name?
  76 * A match is found if
  77 *
  78 * (1) the 'match' string is leading directory of 'name', or
  79 * (2) the 'match' string is a wildcard and matches 'name', or
  80 * (3) the 'match' string is exactly the same as 'name'.
  81 *
  82 * and the return value tells which case it was.
  83 *
  84 * It returns 0 when there is no match.
  85 */
  86static int match_one(const char *match, const char *name, int namelen)
  87{
  88        int matchlen;
  89
  90        /* If the match was just the prefix, we matched */
  91        if (!*match)
  92                return MATCHED_RECURSIVELY;
  93
  94        for (;;) {
  95                unsigned char c1 = *match;
  96                unsigned char c2 = *name;
  97                if (c1 == '\0' || is_glob_special(c1))
  98                        break;
  99                if (c1 != c2)
 100                        return 0;
 101                match++;
 102                name++;
 103                namelen--;
 104        }
 105
 106
 107        /*
 108         * If we don't match the matchstring exactly,
 109         * we need to match by fnmatch
 110         */
 111        matchlen = strlen(match);
 112        if (strncmp(match, name, matchlen))
 113                return !fnmatch(match, name, 0) ? MATCHED_FNMATCH : 0;
 114
 115        if (namelen == matchlen)
 116                return MATCHED_EXACTLY;
 117        if (match[matchlen-1] == '/' || name[matchlen] == '/')
 118                return MATCHED_RECURSIVELY;
 119        return 0;
 120}
 121
 122/*
 123 * Given a name and a list of pathspecs, see if the name matches
 124 * any of the pathspecs.  The caller is also interested in seeing
 125 * all pathspec matches some names it calls this function with
 126 * (otherwise the user could have mistyped the unmatched pathspec),
 127 * and a mark is left in seen[] array for pathspec element that
 128 * actually matched anything.
 129 */
 130int match_pathspec(const char **pathspec, const char *name, int namelen,
 131                int prefix, char *seen)
 132{
 133        int i, retval = 0;
 134
 135        if (!pathspec)
 136                return 1;
 137
 138        name += prefix;
 139        namelen -= prefix;
 140
 141        for (i = 0; pathspec[i] != NULL; i++) {
 142                int how;
 143                const char *match = pathspec[i] + prefix;
 144                if (seen && seen[i] == MATCHED_EXACTLY)
 145                        continue;
 146                how = match_one(match, name, namelen);
 147                if (how) {
 148                        if (retval < how)
 149                                retval = how;
 150                        if (seen && seen[i] < how)
 151                                seen[i] = how;
 152                }
 153        }
 154        return retval;
 155}
 156
 157static int no_wildcard(const char *string)
 158{
 159        return string[strcspn(string, "*?[{\\")] == '\0';
 160}
 161
 162void add_exclude(const char *string, const char *base,
 163                 int baselen, struct exclude_list *which)
 164{
 165        struct exclude *x;
 166        size_t len;
 167        int to_exclude = 1;
 168        int flags = 0;
 169
 170        if (*string == '!') {
 171                to_exclude = 0;
 172                string++;
 173        }
 174        len = strlen(string);
 175        if (len && string[len - 1] == '/') {
 176                char *s;
 177                x = xmalloc(sizeof(*x) + len);
 178                s = (char *)(x+1);
 179                memcpy(s, string, len - 1);
 180                s[len - 1] = '\0';
 181                string = s;
 182                x->pattern = s;
 183                flags = EXC_FLAG_MUSTBEDIR;
 184        } else {
 185                x = xmalloc(sizeof(*x));
 186                x->pattern = string;
 187        }
 188        x->to_exclude = to_exclude;
 189        x->patternlen = strlen(string);
 190        x->base = base;
 191        x->baselen = baselen;
 192        x->flags = flags;
 193        if (!strchr(string, '/'))
 194                x->flags |= EXC_FLAG_NODIR;
 195        if (no_wildcard(string))
 196                x->flags |= EXC_FLAG_NOWILDCARD;
 197        if (*string == '*' && no_wildcard(string+1))
 198                x->flags |= EXC_FLAG_ENDSWITH;
 199        ALLOC_GROW(which->excludes, which->nr + 1, which->alloc);
 200        which->excludes[which->nr++] = x;
 201}
 202
 203static void *read_skip_worktree_file_from_index(const char *path, size_t *size)
 204{
 205        int pos, len;
 206        unsigned long sz;
 207        enum object_type type;
 208        void *data;
 209        struct index_state *istate = &the_index;
 210
 211        len = strlen(path);
 212        pos = index_name_pos(istate, path, len);
 213        if (pos < 0)
 214                return NULL;
 215        if (!ce_skip_worktree(istate->cache[pos]))
 216                return NULL;
 217        data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz);
 218        if (!data || type != OBJ_BLOB) {
 219                free(data);
 220                return NULL;
 221        }
 222        *size = xsize_t(sz);
 223        return data;
 224}
 225
 226int add_excludes_from_file_to_list(const char *fname,
 227                                   const char *base,
 228                                   int baselen,
 229                                   char **buf_p,
 230                                   struct exclude_list *which,
 231                                   int check_index)
 232{
 233        struct stat st;
 234        int fd, i;
 235        size_t size;
 236        char *buf, *entry;
 237
 238        fd = open(fname, O_RDONLY);
 239        if (fd < 0 || fstat(fd, &st) < 0) {
 240                if (0 <= fd)
 241                        close(fd);
 242                if (!check_index ||
 243                    (buf = read_skip_worktree_file_from_index(fname, &size)) == NULL)
 244                        return -1;
 245                if (size == 0) {
 246                        free(buf);
 247                        return 0;
 248                }
 249                if (buf[size-1] != '\n') {
 250                        buf = xrealloc(buf, size+1);
 251                        buf[size++] = '\n';
 252                }
 253        }
 254        else {
 255                size = xsize_t(st.st_size);
 256                if (size == 0) {
 257                        close(fd);
 258                        return 0;
 259                }
 260                buf = xmalloc(size+1);
 261                if (read_in_full(fd, buf, size) != size) {
 262                        free(buf);
 263                        close(fd);
 264                        return -1;
 265                }
 266                buf[size++] = '\n';
 267                close(fd);
 268        }
 269
 270        if (buf_p)
 271                *buf_p = buf;
 272        entry = buf;
 273        for (i = 0; i < size; i++) {
 274                if (buf[i] == '\n') {
 275                        if (entry != buf + i && entry[0] != '#') {
 276                                buf[i - (i && buf[i-1] == '\r')] = 0;
 277                                add_exclude(entry, base, baselen, which);
 278                        }
 279                        entry = buf + i + 1;
 280                }
 281        }
 282        return 0;
 283}
 284
 285void add_excludes_from_file(struct dir_struct *dir, const char *fname)
 286{
 287        if (add_excludes_from_file_to_list(fname, "", 0, NULL,
 288                                           &dir->exclude_list[EXC_FILE], 0) < 0)
 289                die("cannot use %s as an exclude file", fname);
 290}
 291
 292static void prep_exclude(struct dir_struct *dir, const char *base, int baselen)
 293{
 294        struct exclude_list *el;
 295        struct exclude_stack *stk = NULL;
 296        int current;
 297
 298        if ((!dir->exclude_per_dir) ||
 299            (baselen + strlen(dir->exclude_per_dir) >= PATH_MAX))
 300                return; /* too long a path -- ignore */
 301
 302        /* Pop the ones that are not the prefix of the path being checked. */
 303        el = &dir->exclude_list[EXC_DIRS];
 304        while ((stk = dir->exclude_stack) != NULL) {
 305                if (stk->baselen <= baselen &&
 306                    !strncmp(dir->basebuf, base, stk->baselen))
 307                        break;
 308                dir->exclude_stack = stk->prev;
 309                while (stk->exclude_ix < el->nr)
 310                        free(el->excludes[--el->nr]);
 311                free(stk->filebuf);
 312                free(stk);
 313        }
 314
 315        /* Read from the parent directories and push them down. */
 316        current = stk ? stk->baselen : -1;
 317        while (current < baselen) {
 318                struct exclude_stack *stk = xcalloc(1, sizeof(*stk));
 319                const char *cp;
 320
 321                if (current < 0) {
 322                        cp = base;
 323                        current = 0;
 324                }
 325                else {
 326                        cp = strchr(base + current + 1, '/');
 327                        if (!cp)
 328                                die("oops in prep_exclude");
 329                        cp++;
 330                }
 331                stk->prev = dir->exclude_stack;
 332                stk->baselen = cp - base;
 333                stk->exclude_ix = el->nr;
 334                memcpy(dir->basebuf + current, base + current,
 335                       stk->baselen - current);
 336                strcpy(dir->basebuf + stk->baselen, dir->exclude_per_dir);
 337                add_excludes_from_file_to_list(dir->basebuf,
 338                                               dir->basebuf, stk->baselen,
 339                                               &stk->filebuf, el, 1);
 340                dir->exclude_stack = stk;
 341                current = stk->baselen;
 342        }
 343        dir->basebuf[baselen] = '\0';
 344}
 345
 346/* Scan the list and let the last match determine the fate.
 347 * Return 1 for exclude, 0 for include and -1 for undecided.
 348 */
 349int excluded_from_list(const char *pathname,
 350                       int pathlen, const char *basename, int *dtype,
 351                       struct exclude_list *el)
 352{
 353        int i;
 354
 355        if (el->nr) {
 356                for (i = el->nr - 1; 0 <= i; i--) {
 357                        struct exclude *x = el->excludes[i];
 358                        const char *exclude = x->pattern;
 359                        int to_exclude = x->to_exclude;
 360
 361                        if (x->flags & EXC_FLAG_MUSTBEDIR) {
 362                                if (!dtype) {
 363                                        if (!prefixcmp(pathname, exclude))
 364                                                return to_exclude;
 365                                        else
 366                                                continue;
 367                                }
 368                                if (*dtype == DT_UNKNOWN)
 369                                        *dtype = get_dtype(NULL, pathname, pathlen);
 370                                if (*dtype != DT_DIR)
 371                                        continue;
 372                        }
 373
 374                        if (x->flags & EXC_FLAG_NODIR) {
 375                                /* match basename */
 376                                if (x->flags & EXC_FLAG_NOWILDCARD) {
 377                                        if (!strcmp(exclude, basename))
 378                                                return to_exclude;
 379                                } else if (x->flags & EXC_FLAG_ENDSWITH) {
 380                                        if (x->patternlen - 1 <= pathlen &&
 381                                            !strcmp(exclude + 1, pathname + pathlen - x->patternlen + 1))
 382                                                return to_exclude;
 383                                } else {
 384                                        if (fnmatch(exclude, basename, 0) == 0)
 385                                                return to_exclude;
 386                                }
 387                        }
 388                        else {
 389                                /* match with FNM_PATHNAME:
 390                                 * exclude has base (baselen long) implicitly
 391                                 * in front of it.
 392                                 */
 393                                int baselen = x->baselen;
 394                                if (*exclude == '/')
 395                                        exclude++;
 396
 397                                if (pathlen < baselen ||
 398                                    (baselen && pathname[baselen-1] != '/') ||
 399                                    strncmp(pathname, x->base, baselen))
 400                                    continue;
 401
 402                                if (x->flags & EXC_FLAG_NOWILDCARD) {
 403                                        if (!strcmp(exclude, pathname + baselen))
 404                                                return to_exclude;
 405                                } else {
 406                                        if (fnmatch(exclude, pathname+baselen,
 407                                                    FNM_PATHNAME) == 0)
 408                                            return to_exclude;
 409                                }
 410                        }
 411                }
 412        }
 413        return -1; /* undecided */
 414}
 415
 416int excluded(struct dir_struct *dir, const char *pathname, int *dtype_p)
 417{
 418        int pathlen = strlen(pathname);
 419        int st;
 420        const char *basename = strrchr(pathname, '/');
 421        basename = (basename) ? basename+1 : pathname;
 422
 423        prep_exclude(dir, pathname, basename-pathname);
 424        for (st = EXC_CMDL; st <= EXC_FILE; st++) {
 425                switch (excluded_from_list(pathname, pathlen, basename,
 426                                           dtype_p, &dir->exclude_list[st])) {
 427                case 0:
 428                        return 0;
 429                case 1:
 430                        return 1;
 431                }
 432        }
 433        return 0;
 434}
 435
 436static struct dir_entry *dir_entry_new(const char *pathname, int len)
 437{
 438        struct dir_entry *ent;
 439
 440        ent = xmalloc(sizeof(*ent) + len + 1);
 441        ent->len = len;
 442        memcpy(ent->name, pathname, len);
 443        ent->name[len] = 0;
 444        return ent;
 445}
 446
 447static struct dir_entry *dir_add_name(struct dir_struct *dir, const char *pathname, int len)
 448{
 449        if (cache_name_exists(pathname, len, ignore_case))
 450                return NULL;
 451
 452        ALLOC_GROW(dir->entries, dir->nr+1, dir->alloc);
 453        return dir->entries[dir->nr++] = dir_entry_new(pathname, len);
 454}
 455
 456struct dir_entry *dir_add_ignored(struct dir_struct *dir, const char *pathname, int len)
 457{
 458        if (!cache_name_is_other(pathname, len))
 459                return NULL;
 460
 461        ALLOC_GROW(dir->ignored, dir->ignored_nr+1, dir->ignored_alloc);
 462        return dir->ignored[dir->ignored_nr++] = dir_entry_new(pathname, len);
 463}
 464
 465enum exist_status {
 466        index_nonexistent = 0,
 467        index_directory,
 468        index_gitdir
 469};
 470
 471/*
 472 * The index sorts alphabetically by entry name, which
 473 * means that a gitlink sorts as '\0' at the end, while
 474 * a directory (which is defined not as an entry, but as
 475 * the files it contains) will sort with the '/' at the
 476 * end.
 477 */
 478static enum exist_status directory_exists_in_index(const char *dirname, int len)
 479{
 480        int pos = cache_name_pos(dirname, len);
 481        if (pos < 0)
 482                pos = -pos-1;
 483        while (pos < active_nr) {
 484                struct cache_entry *ce = active_cache[pos++];
 485                unsigned char endchar;
 486
 487                if (strncmp(ce->name, dirname, len))
 488                        break;
 489                endchar = ce->name[len];
 490                if (endchar > '/')
 491                        break;
 492                if (endchar == '/')
 493                        return index_directory;
 494                if (!endchar && S_ISGITLINK(ce->ce_mode))
 495                        return index_gitdir;
 496        }
 497        return index_nonexistent;
 498}
 499
 500/*
 501 * When we find a directory when traversing the filesystem, we
 502 * have three distinct cases:
 503 *
 504 *  - ignore it
 505 *  - see it as a directory
 506 *  - recurse into it
 507 *
 508 * and which one we choose depends on a combination of existing
 509 * git index contents and the flags passed into the directory
 510 * traversal routine.
 511 *
 512 * Case 1: If we *already* have entries in the index under that
 513 * directory name, we always recurse into the directory to see
 514 * all the files.
 515 *
 516 * Case 2: If we *already* have that directory name as a gitlink,
 517 * we always continue to see it as a gitlink, regardless of whether
 518 * there is an actual git directory there or not (it might not
 519 * be checked out as a subproject!)
 520 *
 521 * Case 3: if we didn't have it in the index previously, we
 522 * have a few sub-cases:
 523 *
 524 *  (a) if "show_other_directories" is true, we show it as
 525 *      just a directory, unless "hide_empty_directories" is
 526 *      also true and the directory is empty, in which case
 527 *      we just ignore it entirely.
 528 *  (b) if it looks like a git directory, and we don't have
 529 *      'no_gitlinks' set we treat it as a gitlink, and show it
 530 *      as a directory.
 531 *  (c) otherwise, we recurse into it.
 532 */
 533enum directory_treatment {
 534        show_directory,
 535        ignore_directory,
 536        recurse_into_directory
 537};
 538
 539static enum directory_treatment treat_directory(struct dir_struct *dir,
 540        const char *dirname, int len,
 541        const struct path_simplify *simplify)
 542{
 543        /* The "len-1" is to strip the final '/' */
 544        switch (directory_exists_in_index(dirname, len-1)) {
 545        case index_directory:
 546                return recurse_into_directory;
 547
 548        case index_gitdir:
 549                if (dir->flags & DIR_SHOW_OTHER_DIRECTORIES)
 550                        return ignore_directory;
 551                return show_directory;
 552
 553        case index_nonexistent:
 554                if (dir->flags & DIR_SHOW_OTHER_DIRECTORIES)
 555                        break;
 556                if (!(dir->flags & DIR_NO_GITLINKS)) {
 557                        unsigned char sha1[20];
 558                        if (resolve_gitlink_ref(dirname, "HEAD", sha1) == 0)
 559                                return show_directory;
 560                }
 561                return recurse_into_directory;
 562        }
 563
 564        /* This is the "show_other_directories" case */
 565        if (!(dir->flags & DIR_HIDE_EMPTY_DIRECTORIES))
 566                return show_directory;
 567        if (!read_directory_recursive(dir, dirname, len, 1, simplify))
 568                return ignore_directory;
 569        return show_directory;
 570}
 571
 572/*
 573 * This is an inexact early pruning of any recursive directory
 574 * reading - if the path cannot possibly be in the pathspec,
 575 * return true, and we'll skip it early.
 576 */
 577static int simplify_away(const char *path, int pathlen, const struct path_simplify *simplify)
 578{
 579        if (simplify) {
 580                for (;;) {
 581                        const char *match = simplify->path;
 582                        int len = simplify->len;
 583
 584                        if (!match)
 585                                break;
 586                        if (len > pathlen)
 587                                len = pathlen;
 588                        if (!memcmp(path, match, len))
 589                                return 0;
 590                        simplify++;
 591                }
 592                return 1;
 593        }
 594        return 0;
 595}
 596
 597/*
 598 * This function tells us whether an excluded path matches a
 599 * list of "interesting" pathspecs. That is, whether a path matched
 600 * by any of the pathspecs could possibly be ignored by excluding
 601 * the specified path. This can happen if:
 602 *
 603 *   1. the path is mentioned explicitly in the pathspec
 604 *
 605 *   2. the path is a directory prefix of some element in the
 606 *      pathspec
 607 */
 608static int exclude_matches_pathspec(const char *path, int len,
 609                const struct path_simplify *simplify)
 610{
 611        if (simplify) {
 612                for (; simplify->path; simplify++) {
 613                        if (len == simplify->len
 614                            && !memcmp(path, simplify->path, len))
 615                                return 1;
 616                        if (len < simplify->len
 617                            && simplify->path[len] == '/'
 618                            && !memcmp(path, simplify->path, len))
 619                                return 1;
 620                }
 621        }
 622        return 0;
 623}
 624
 625static int get_index_dtype(const char *path, int len)
 626{
 627        int pos;
 628        struct cache_entry *ce;
 629
 630        ce = cache_name_exists(path, len, 0);
 631        if (ce) {
 632                if (!ce_uptodate(ce))
 633                        return DT_UNKNOWN;
 634                if (S_ISGITLINK(ce->ce_mode))
 635                        return DT_DIR;
 636                /*
 637                 * Nobody actually cares about the
 638                 * difference between DT_LNK and DT_REG
 639                 */
 640                return DT_REG;
 641        }
 642
 643        /* Try to look it up as a directory */
 644        pos = cache_name_pos(path, len);
 645        if (pos >= 0)
 646                return DT_UNKNOWN;
 647        pos = -pos-1;
 648        while (pos < active_nr) {
 649                ce = active_cache[pos++];
 650                if (strncmp(ce->name, path, len))
 651                        break;
 652                if (ce->name[len] > '/')
 653                        break;
 654                if (ce->name[len] < '/')
 655                        continue;
 656                if (!ce_uptodate(ce))
 657                        break;  /* continue? */
 658                return DT_DIR;
 659        }
 660        return DT_UNKNOWN;
 661}
 662
 663static int get_dtype(struct dirent *de, const char *path, int len)
 664{
 665        int dtype = de ? DTYPE(de) : DT_UNKNOWN;
 666        struct stat st;
 667
 668        if (dtype != DT_UNKNOWN)
 669                return dtype;
 670        dtype = get_index_dtype(path, len);
 671        if (dtype != DT_UNKNOWN)
 672                return dtype;
 673        if (lstat(path, &st))
 674                return dtype;
 675        if (S_ISREG(st.st_mode))
 676                return DT_REG;
 677        if (S_ISDIR(st.st_mode))
 678                return DT_DIR;
 679        if (S_ISLNK(st.st_mode))
 680                return DT_LNK;
 681        return dtype;
 682}
 683
 684enum path_treatment {
 685        path_ignored,
 686        path_handled,
 687        path_recurse
 688};
 689
 690static enum path_treatment treat_one_path(struct dir_struct *dir,
 691                                          char *path, int *len,
 692                                          const struct path_simplify *simplify,
 693                                          int dtype, struct dirent *de)
 694{
 695        int exclude = excluded(dir, path, &dtype);
 696        if (exclude && (dir->flags & DIR_COLLECT_IGNORED)
 697            && exclude_matches_pathspec(path, *len, simplify))
 698                dir_add_ignored(dir, path, *len);
 699
 700        /*
 701         * Excluded? If we don't explicitly want to show
 702         * ignored files, ignore it
 703         */
 704        if (exclude && !(dir->flags & DIR_SHOW_IGNORED))
 705                return path_ignored;
 706
 707        if (dtype == DT_UNKNOWN)
 708                dtype = get_dtype(de, path, *len);
 709
 710        /*
 711         * Do we want to see just the ignored files?
 712         * We still need to recurse into directories,
 713         * even if we don't ignore them, since the
 714         * directory may contain files that we do..
 715         */
 716        if (!exclude && (dir->flags & DIR_SHOW_IGNORED)) {
 717                if (dtype != DT_DIR)
 718                        return path_ignored;
 719        }
 720
 721        switch (dtype) {
 722        default:
 723                return path_ignored;
 724        case DT_DIR:
 725                memcpy(path + *len, "/", 2);
 726                (*len)++;
 727                switch (treat_directory(dir, path, *len, simplify)) {
 728                case show_directory:
 729                        if (exclude != !!(dir->flags
 730                                          & DIR_SHOW_IGNORED))
 731                                return path_ignored;
 732                        break;
 733                case recurse_into_directory:
 734                        return path_recurse;
 735                case ignore_directory:
 736                        return path_ignored;
 737                }
 738                break;
 739        case DT_REG:
 740        case DT_LNK:
 741                break;
 742        }
 743        return path_handled;
 744}
 745
 746static enum path_treatment treat_path(struct dir_struct *dir,
 747                                      struct dirent *de,
 748                                      char *path, int path_max,
 749                                      int baselen,
 750                                      const struct path_simplify *simplify,
 751                                      int *len)
 752{
 753        int dtype;
 754
 755        if (is_dot_or_dotdot(de->d_name) || !strcmp(de->d_name, ".git"))
 756                return path_ignored;
 757        *len = strlen(de->d_name);
 758        /* Ignore overly long pathnames! */
 759        if (*len + baselen + 8 > path_max)
 760                return path_ignored;
 761        memcpy(path + baselen, de->d_name, *len + 1);
 762        *len += baselen;
 763        if (simplify_away(path, *len, simplify))
 764                return path_ignored;
 765
 766        dtype = DTYPE(de);
 767        return treat_one_path(dir, path, len, simplify, dtype, de);
 768}
 769
 770/*
 771 * Read a directory tree. We currently ignore anything but
 772 * directories, regular files and symlinks. That's because git
 773 * doesn't handle them at all yet. Maybe that will change some
 774 * day.
 775 *
 776 * Also, we ignore the name ".git" (even if it is not a directory).
 777 * That likely will not change.
 778 */
 779static int read_directory_recursive(struct dir_struct *dir,
 780                                    const char *base, int baselen,
 781                                    int check_only,
 782                                    const struct path_simplify *simplify)
 783{
 784        DIR *fdir = opendir(*base ? base : ".");
 785        int contents = 0;
 786
 787        if (fdir) {
 788                struct dirent *de;
 789                char path[PATH_MAX + 1];
 790                memcpy(path, base, baselen);
 791
 792                while ((de = readdir(fdir)) != NULL) {
 793                        int len;
 794                        switch (treat_path(dir, de, path, sizeof(path),
 795                                           baselen, simplify, &len)) {
 796                        case path_recurse:
 797                                contents += read_directory_recursive
 798                                        (dir, path, len, 0, simplify);
 799                                continue;
 800                        case path_ignored:
 801                                continue;
 802                        case path_handled:
 803                                break;
 804                        }
 805                        contents++;
 806                        if (check_only)
 807                                goto exit_early;
 808                        else
 809                                dir_add_name(dir, path, len);
 810                }
 811exit_early:
 812                closedir(fdir);
 813        }
 814
 815        return contents;
 816}
 817
 818static int cmp_name(const void *p1, const void *p2)
 819{
 820        const struct dir_entry *e1 = *(const struct dir_entry **)p1;
 821        const struct dir_entry *e2 = *(const struct dir_entry **)p2;
 822
 823        return cache_name_compare(e1->name, e1->len,
 824                                  e2->name, e2->len);
 825}
 826
 827/*
 828 * Return the length of the "simple" part of a path match limiter.
 829 */
 830static int simple_length(const char *match)
 831{
 832        int len = -1;
 833
 834        for (;;) {
 835                unsigned char c = *match++;
 836                len++;
 837                if (c == '\0' || is_glob_special(c))
 838                        return len;
 839        }
 840}
 841
 842static struct path_simplify *create_simplify(const char **pathspec)
 843{
 844        int nr, alloc = 0;
 845        struct path_simplify *simplify = NULL;
 846
 847        if (!pathspec)
 848                return NULL;
 849
 850        for (nr = 0 ; ; nr++) {
 851                const char *match;
 852                if (nr >= alloc) {
 853                        alloc = alloc_nr(alloc);
 854                        simplify = xrealloc(simplify, alloc * sizeof(*simplify));
 855                }
 856                match = *pathspec++;
 857                if (!match)
 858                        break;
 859                simplify[nr].path = match;
 860                simplify[nr].len = simple_length(match);
 861        }
 862        simplify[nr].path = NULL;
 863        simplify[nr].len = 0;
 864        return simplify;
 865}
 866
 867static void free_simplify(struct path_simplify *simplify)
 868{
 869        free(simplify);
 870}
 871
 872static int treat_leading_path(struct dir_struct *dir,
 873                              const char *path, int len,
 874                              const struct path_simplify *simplify)
 875{
 876        char pathbuf[PATH_MAX];
 877        int baselen, blen;
 878        const char *cp;
 879
 880        while (len && path[len - 1] == '/')
 881                len--;
 882        if (!len)
 883                return 1;
 884        baselen = 0;
 885        while (1) {
 886                cp = path + baselen + !!baselen;
 887                cp = memchr(cp, '/', path + len - cp);
 888                if (!cp)
 889                        baselen = len;
 890                else
 891                        baselen = cp - path;
 892                memcpy(pathbuf, path, baselen);
 893                pathbuf[baselen] = '\0';
 894                if (!is_directory(pathbuf))
 895                        return 0;
 896                if (simplify_away(pathbuf, baselen, simplify))
 897                        return 0;
 898                blen = baselen;
 899                if (treat_one_path(dir, pathbuf, &blen, simplify,
 900                                   DT_DIR, NULL) == path_ignored)
 901                        return 0; /* do not recurse into it */
 902                if (len <= baselen)
 903                        return 1; /* finished checking */
 904        }
 905}
 906
 907int read_directory(struct dir_struct *dir, const char *path, int len, const char **pathspec)
 908{
 909        struct path_simplify *simplify;
 910
 911        if (has_symlink_leading_path(path, len))
 912                return dir->nr;
 913
 914        simplify = create_simplify(pathspec);
 915        if (!len || treat_leading_path(dir, path, len, simplify))
 916                read_directory_recursive(dir, path, len, 0, simplify);
 917        free_simplify(simplify);
 918        qsort(dir->entries, dir->nr, sizeof(struct dir_entry *), cmp_name);
 919        qsort(dir->ignored, dir->ignored_nr, sizeof(struct dir_entry *), cmp_name);
 920        return dir->nr;
 921}
 922
 923int file_exists(const char *f)
 924{
 925        struct stat sb;
 926        return lstat(f, &sb) == 0;
 927}
 928
 929/*
 930 * get_relative_cwd() gets the prefix of the current working directory
 931 * relative to 'dir'.  If we are not inside 'dir', it returns NULL.
 932 *
 933 * As a convenience, it also returns NULL if 'dir' is already NULL.  The
 934 * reason for this behaviour is that it is natural for functions returning
 935 * directory names to return NULL to say "this directory does not exist"
 936 * or "this directory is invalid".  These cases are usually handled the
 937 * same as if the cwd is not inside 'dir' at all, so get_relative_cwd()
 938 * returns NULL for both of them.
 939 *
 940 * Most notably, get_relative_cwd(buffer, size, get_git_work_tree())
 941 * unifies the handling of "outside work tree" with "no work tree at all".
 942 */
 943char *get_relative_cwd(char *buffer, int size, const char *dir)
 944{
 945        char *cwd = buffer;
 946
 947        if (!dir)
 948                return NULL;
 949        if (!getcwd(buffer, size))
 950                die_errno("can't find the current directory");
 951
 952        if (!is_absolute_path(dir))
 953                dir = make_absolute_path(dir);
 954
 955        while (*dir && *dir == *cwd) {
 956                dir++;
 957                cwd++;
 958        }
 959        if (*dir)
 960                return NULL;
 961        switch (*cwd) {
 962        case '\0':
 963                return cwd;
 964        case '/':
 965                return cwd + 1;
 966        default:
 967                return NULL;
 968        }
 969}
 970
 971int is_inside_dir(const char *dir)
 972{
 973        char buffer[PATH_MAX];
 974        return get_relative_cwd(buffer, sizeof(buffer), dir) != NULL;
 975}
 976
 977int is_empty_dir(const char *path)
 978{
 979        DIR *dir = opendir(path);
 980        struct dirent *e;
 981        int ret = 1;
 982
 983        if (!dir)
 984                return 0;
 985
 986        while ((e = readdir(dir)) != NULL)
 987                if (!is_dot_or_dotdot(e->d_name)) {
 988                        ret = 0;
 989                        break;
 990                }
 991
 992        closedir(dir);
 993        return ret;
 994}
 995
 996int remove_dir_recursively(struct strbuf *path, int flag)
 997{
 998        DIR *dir;
 999        struct dirent *e;
1000        int ret = 0, original_len = path->len, len;
1001        int only_empty = (flag & REMOVE_DIR_EMPTY_ONLY);
1002        unsigned char submodule_head[20];
1003
1004        if ((flag & REMOVE_DIR_KEEP_NESTED_GIT) &&
1005            !resolve_gitlink_ref(path->buf, "HEAD", submodule_head))
1006                /* Do not descend and nuke a nested git work tree. */
1007                return 0;
1008
1009        dir = opendir(path->buf);
1010        if (!dir)
1011                return -1;
1012        if (path->buf[original_len - 1] != '/')
1013                strbuf_addch(path, '/');
1014
1015        len = path->len;
1016        while ((e = readdir(dir)) != NULL) {
1017                struct stat st;
1018                if (is_dot_or_dotdot(e->d_name))
1019                        continue;
1020
1021                strbuf_setlen(path, len);
1022                strbuf_addstr(path, e->d_name);
1023                if (lstat(path->buf, &st))
1024                        ; /* fall thru */
1025                else if (S_ISDIR(st.st_mode)) {
1026                        if (!remove_dir_recursively(path, only_empty))
1027                                continue; /* happy */
1028                } else if (!only_empty && !unlink(path->buf))
1029                        continue; /* happy, too */
1030
1031                /* path too long, stat fails, or non-directory still exists */
1032                ret = -1;
1033                break;
1034        }
1035        closedir(dir);
1036
1037        strbuf_setlen(path, original_len);
1038        if (!ret)
1039                ret = rmdir(path->buf);
1040        return ret;
1041}
1042
1043void setup_standard_excludes(struct dir_struct *dir)
1044{
1045        const char *path;
1046
1047        dir->exclude_per_dir = ".gitignore";
1048        path = git_path("info/exclude");
1049        if (!access(path, R_OK))
1050                add_excludes_from_file(dir, path);
1051        if (excludes_file && !access(excludes_file, R_OK))
1052                add_excludes_from_file(dir, excludes_file);
1053}
1054
1055int remove_path(const char *name)
1056{
1057        char *slash;
1058
1059        if (unlink(name) && errno != ENOENT)
1060                return -1;
1061
1062        slash = strrchr(name, '/');
1063        if (slash) {
1064                char *dirs = xstrdup(name);
1065                slash = dirs + (slash - name);
1066                do {
1067                        *slash = '\0';
1068                } while (rmdir(dirs) == 0 && (slash = strrchr(dirs, '/')));
1069                free(dirs);
1070        }
1071        return 0;
1072}
1073