dir.c

   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
  12 struct path_simplify {
  13         int len;
  14         const char *path;
  15 };
  16
  17 static int read_directory_recursive(struct dir_struct *dir, const char *path, int len,
  18         int check_only, const struct path_simplify *simplify);
  19 static int get_dtype(struct dirent *de, const char *path, int len);
  20
  21 static 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         prefix = slash - path + 1;
  35         while ((next = *++pathspec) != NULL) {
  36                 int len = strlen(next);
  37                 if (len >= prefix && !memcmp(path, next, prefix))
  38                         continue;
  39                 len = prefix - 1;
  40                 for (;;) {
  41                         if (!len)
  42                                 return 0;
  43                         if (next[--len] != '/')
  44                                 continue;
  45                         if (memcmp(path, next, len+1))
  46                                 continue;
  47                         prefix = len + 1;
  48                         break;
  49                 }
  50         }
  51         return prefix;
  52 }
  53
  54 int 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  */
  86 static 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  */
 130 int 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
 157 static int no_wildcard(const char *string)
 158 {
 159         return string[strcspn(string, "*?[{\\")] == '\0';
 160 }
 161
 162 void 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
 203 static int add_excludes_from_file_1(const char *fname,
 204                                     const char *base,
 205                                     int baselen,
 206                                     char **buf_p,
 207                                     struct exclude_list *which)
 208 {
 209         struct stat st;
 210         int fd, i;
 211         size_t size;
 212         char *buf, *entry;
 213
 214         fd = open(fname, O_RDONLY);
 215         if (fd < 0 || fstat(fd, &st) < 0)
 216                 goto err;
 217         size = xsize_t(st.st_size);
 218         if (size == 0) {
 219                 close(fd);
 220                 return 0;
 221         }
 222         buf = xmalloc(size+1);
 223         if (read_in_full(fd, buf, size) != size)
 224         {
 225                 free(buf);
 226                 goto err;
 227         }
 228         close(fd);
 229
 230         if (buf_p)
 231                 *buf_p = buf;
 232         entry = buf;
 233         for (i = 0; i <= size; i++) {
 234                 if (i == size || buf[i] == '\n') {
 235                         if (entry != buf + i && entry[0] != '#') {
 236                                 buf[i - (i && buf[i-1] == '\r')] = 0;
 237                                 add_exclude(entry, base, baselen, which);
 238                         }
 239                         entry = buf + i + 1;
 240                 }
 241         }
 242         return 0;
 243
 244  err:
 245         if (0 <= fd)
 246                 close(fd);
 247         return -1;
 248 }
 249
 250 void add_excludes_from_file(struct dir_struct *dir, const char *fname)
 251 {
 252         if (add_excludes_from_file_1(fname, "", 0, NULL,
 253                                      &dir->exclude_list[EXC_FILE]) < 0)
 254                 die("cannot use %s as an exclude file", fname);
 255 }
 256
 257 static void prep_exclude(struct dir_struct *dir, const char *base, int baselen)
 258 {
 259         struct exclude_list *el;
 260         struct exclude_stack *stk = NULL;
 261         int current;
 262
 263         if ((!dir->exclude_per_dir) ||
 264             (baselen + strlen(dir->exclude_per_dir) >= PATH_MAX))
 265                 return; /* too long a path -- ignore */
 266
 267         /* Pop the ones that are not the prefix of the path being checked. */
 268         el = &dir->exclude_list[EXC_DIRS];
 269         while ((stk = dir->exclude_stack) != NULL) {
 270                 if (stk->baselen <= baselen &&
 271                     !strncmp(dir->basebuf, base, stk->baselen))
 272                         break;
 273                 dir->exclude_stack = stk->prev;
 274                 while (stk->exclude_ix < el->nr)
 275                         free(el->excludes[--el->nr]);
 276                 free(stk->filebuf);
 277                 free(stk);
 278         }
 279
 280         /* Read from the parent directories and push them down. */
 281         current = stk ? stk->baselen : -1;
 282         while (current < baselen) {
 283                 struct exclude_stack *stk = xcalloc(1, sizeof(*stk));
 284                 const char *cp;
 285
 286                 if (current < 0) {
 287                         cp = base;
 288                         current = 0;
 289                 }
 290                 else {
 291                         cp = strchr(base + current + 1, '/');
 292                         if (!cp)
 293                                 die("oops in prep_exclude");
 294                         cp++;
 295                 }
 296                 stk->prev = dir->exclude_stack;
 297                 stk->baselen = cp - base;
 298                 stk->exclude_ix = el->nr;
 299                 memcpy(dir->basebuf + current, base + current,
 300                        stk->baselen - current);
 301                 strcpy(dir->basebuf + stk->baselen, dir->exclude_per_dir);
 302                 add_excludes_from_file_1(dir->basebuf,
 303                                          dir->basebuf, stk->baselen,
 304                                          &stk->filebuf, el);
 305                 dir->exclude_stack = stk;
 306                 current = stk->baselen;
 307         }
 308         dir->basebuf[baselen] = '\0';
 309 }
 310
 311 /* Scan the list and let the last match determine the fate.
 312  * Return 1 for exclude, 0 for include and -1 for undecided.
 313  */
 314 static int excluded_1(const char *pathname,
 315                       int pathlen, const char *basename, int *dtype,
 316                       struct exclude_list *el)
 317 {
 318         int i;
 319
 320         if (el->nr) {
 321                 for (i = el->nr - 1; 0 <= i; i--) {
 322                         struct exclude *x = el->excludes[i];
 323                         const char *exclude = x->pattern;
 324                         int to_exclude = x->to_exclude;
 325
 326                         if (x->flags & EXC_FLAG_MUSTBEDIR) {
 327                                 if (*dtype == DT_UNKNOWN)
 328                                         *dtype = get_dtype(NULL, pathname, pathlen);
 329                                 if (*dtype != DT_DIR)
 330                                         continue;
 331                         }
 332
 333                         if (x->flags & EXC_FLAG_NODIR) {
 334                                 /* match basename */
 335                                 if (x->flags & EXC_FLAG_NOWILDCARD) {
 336                                         if (!strcmp(exclude, basename))
 337                                                 return to_exclude;
 338                                 } else if (x->flags & EXC_FLAG_ENDSWITH) {
 339                                         if (x->patternlen - 1 <= pathlen &&
 340                                             !strcmp(exclude + 1, pathname + pathlen - x->patternlen + 1))
 341                                                 return to_exclude;
 342                                 } else {
 343                                         if (fnmatch(exclude, basename, 0) == 0)
 344                                                 return to_exclude;
 345                                 }
 346                         }
 347                         else {
 348                                 /* match with FNM_PATHNAME:
 349                                  * exclude has base (baselen long) implicitly
 350                                  * in front of it.
 351                                  */
 352                                 int baselen = x->baselen;
 353                                 if (*exclude == '/')
 354                                         exclude++;
 355
 356                                 if (pathlen < baselen ||
 357                                     (baselen && pathname[baselen-1] != '/') ||
 358                                     strncmp(pathname, x->base, baselen))
 359                                     continue;
 360
 361                                 if (x->flags & EXC_FLAG_NOWILDCARD) {
 362                                         if (!strcmp(exclude, pathname + baselen))
 363                                                 return to_exclude;
 364                                 } else {
 365                                         if (fnmatch(exclude, pathname+baselen,
 366                                                     FNM_PATHNAME) == 0)
 367                                             return to_exclude;
 368                                 }
 369                         }
 370                 }
 371         }
 372         return -1; /* undecided */
 373 }
 374
 375 int excluded(struct dir_struct *dir, const char *pathname, int *dtype_p)
 376 {
 377         int pathlen = strlen(pathname);
 378         int st;
 379         const char *basename = strrchr(pathname, '/');
 380         basename = (basename) ? basename+1 : pathname;
 381
 382         prep_exclude(dir, pathname, basename-pathname);
 383         for (st = EXC_CMDL; st <= EXC_FILE; st++) {
 384                 switch (excluded_1(pathname, pathlen, basename,
 385                                    dtype_p, &dir->exclude_list[st])) {
 386                 case 0:
 387                         return 0;
 388                 case 1:
 389                         return 1;
 390                 }
 391         }
 392         return 0;
 393 }
 394
 395 static struct dir_entry *dir_entry_new(const char *pathname, int len)
 396 {
 397         struct dir_entry *ent;
 398
 399         ent = xmalloc(sizeof(*ent) + len + 1);
 400         ent->len = len;
 401         memcpy(ent->name, pathname, len);
 402         ent->name[len] = 0;
 403         return ent;
 404 }
 405
 406 static struct dir_entry *dir_add_name(struct dir_struct *dir, const char *pathname, int len)
 407 {
 408         if (cache_name_exists(pathname, len, ignore_case))
 409                 return NULL;
 410
 411         ALLOC_GROW(dir->entries, dir->nr+1, dir->alloc);
 412         return dir->entries[dir->nr++] = dir_entry_new(pathname, len);
 413 }
 414
 415 static struct dir_entry *dir_add_ignored(struct dir_struct *dir, const char *pathname, int len)
 416 {
 417         if (!cache_name_is_other(pathname, len))
 418                 return NULL;
 419
 420         ALLOC_GROW(dir->ignored, dir->ignored_nr+1, dir->ignored_alloc);
 421         return dir->ignored[dir->ignored_nr++] = dir_entry_new(pathname, len);
 422 }
 423
 424 enum exist_status {
 425         index_nonexistent = 0,
 426         index_directory,
 427         index_gitdir,
 428 };
 429
 430 /*
 431  * The index sorts alphabetically by entry name, which
 432  * means that a gitlink sorts as '\0' at the end, while
 433  * a directory (which is defined not as an entry, but as
 434  * the files it contains) will sort with the '/' at the
 435  * end.
 436  */
 437 static enum exist_status directory_exists_in_index(const char *dirname, int len)
 438 {
 439         int pos = cache_name_pos(dirname, len);
 440         if (pos < 0)
 441                 pos = -pos-1;
 442         while (pos < active_nr) {
 443                 struct cache_entry *ce = active_cache[pos++];
 444                 unsigned char endchar;
 445
 446                 if (strncmp(ce->name, dirname, len))
 447                         break;
 448                 endchar = ce->name[len];
 449                 if (endchar > '/')
 450                         break;
 451                 if (endchar == '/')
 452                         return index_directory;
 453                 if (!endchar && S_ISGITLINK(ce->ce_mode))
 454                         return index_gitdir;
 455         }
 456         return index_nonexistent;
 457 }
 458
 459 /*
 460  * When we find a directory when traversing the filesystem, we
 461  * have three distinct cases:
 462  *
 463  *  - ignore it
 464  *  - see it as a directory
 465  *  - recurse into it
 466  *
 467  * and which one we choose depends on a combination of existing
 468  * git index contents and the flags passed into the directory
 469  * traversal routine.
 470  *
 471  * Case 1: If we *already* have entries in the index under that
 472  * directory name, we always recurse into the directory to see
 473  * all the files.
 474  *
 475  * Case 2: If we *already* have that directory name as a gitlink,
 476  * we always continue to see it as a gitlink, regardless of whether
 477  * there is an actual git directory there or not (it might not
 478  * be checked out as a subproject!)
 479  *
 480  * Case 3: if we didn't have it in the index previously, we
 481  * have a few sub-cases:
 482  *
 483  *  (a) if "show_other_directories" is true, we show it as
 484  *      just a directory, unless "hide_empty_directories" is
 485  *      also true and the directory is empty, in which case
 486  *      we just ignore it entirely.
 487  *  (b) if it looks like a git directory, and we don't have
 488  *      'no_gitlinks' set we treat it as a gitlink, and show it
 489  *      as a directory.
 490  *  (c) otherwise, we recurse into it.
 491  */
 492 enum directory_treatment {
 493         show_directory,
 494         ignore_directory,
 495         recurse_into_directory,
 496 };
 497
 498 static enum directory_treatment treat_directory(struct dir_struct *dir,
 499         const char *dirname, int len,
 500         const struct path_simplify *simplify)
 501 {
 502         /* The "len-1" is to strip the final '/' */
 503         switch (directory_exists_in_index(dirname, len-1)) {
 504         case index_directory:
 505                 return recurse_into_directory;
 506
 507         case index_gitdir:
 508                 if (dir->flags & DIR_SHOW_OTHER_DIRECTORIES)
 509                         return ignore_directory;
 510                 return show_directory;
 511
 512         case index_nonexistent:
 513                 if (dir->flags & DIR_SHOW_OTHER_DIRECTORIES)
 514                         break;
 515                 if (!(dir->flags & DIR_NO_GITLINKS)) {
 516                         unsigned char sha1[20];
 517                         if (resolve_gitlink_ref(dirname, "HEAD", sha1) == 0)
 518                                 return show_directory;
 519                 }
 520                 return recurse_into_directory;
 521         }
 522
 523         /* This is the "show_other_directories" case */
 524         if (!(dir->flags & DIR_HIDE_EMPTY_DIRECTORIES))
 525                 return show_directory;
 526         if (!read_directory_recursive(dir, dirname, len, 1, simplify))
 527                 return ignore_directory;
 528         return show_directory;
 529 }
 530
 531 /*
 532  * This is an inexact early pruning of any recursive directory
 533  * reading - if the path cannot possibly be in the pathspec,
 534  * return true, and we'll skip it early.
 535  */
 536 static int simplify_away(const char *path, int pathlen, const struct path_simplify *simplify)
 537 {
 538         if (simplify) {
 539                 for (;;) {
 540                         const char *match = simplify->path;
 541                         int len = simplify->len;
 542
 543                         if (!match)
 544                                 break;
 545                         if (len > pathlen)
 546                                 len = pathlen;
 547                         if (!memcmp(path, match, len))
 548                                 return 0;
 549                         simplify++;
 550                 }
 551                 return 1;
 552         }
 553         return 0;
 554 }
 555
 556 static int in_pathspec(const char *path, int len, const struct path_simplify *simplify)
 557 {
 558         if (simplify) {
 559                 for (; simplify->path; simplify++) {
 560                         if (len == simplify->len
 561                             && !memcmp(path, simplify->path, len))
 562                                 return 1;
 563                 }
 564         }
 565         return 0;
 566 }
 567
 568 static int get_index_dtype(const char *path, int len)
 569 {
 570         int pos;
 571         struct cache_entry *ce;
 572
 573         ce = cache_name_exists(path, len, 0);
 574         if (ce) {
 575                 if (!ce_uptodate(ce))
 576                         return DT_UNKNOWN;
 577                 if (S_ISGITLINK(ce->ce_mode))
 578                         return DT_DIR;
 579                 /*
 580                  * Nobody actually cares about the
 581                  * difference between DT_LNK and DT_REG
 582                  */
 583                 return DT_REG;
 584         }
 585
 586         /* Try to look it up as a directory */
 587         pos = cache_name_pos(path, len);
 588         if (pos >= 0)
 589                 return DT_UNKNOWN;
 590         pos = -pos-1;
 591         while (pos < active_nr) {
 592                 ce = active_cache[pos++];
 593                 if (strncmp(ce->name, path, len))
 594                         break;
 595                 if (ce->name[len] > '/')
 596                         break;
 597                 if (ce->name[len] < '/')
 598                         continue;
 599                 if (!ce_uptodate(ce))
 600                         break;  /* continue? */
 601                 return DT_DIR;
 602         }
 603         return DT_UNKNOWN;
 604 }
 605
 606 static int get_dtype(struct dirent *de, const char *path, int len)
 607 {
 608         int dtype = de ? DTYPE(de) : DT_UNKNOWN;
 609         struct stat st;
 610
 611         if (dtype != DT_UNKNOWN)
 612                 return dtype;
 613         dtype = get_index_dtype(path, len);
 614         if (dtype != DT_UNKNOWN)
 615                 return dtype;
 616         if (lstat(path, &st))
 617                 return dtype;
 618         if (S_ISREG(st.st_mode))
 619                 return DT_REG;
 620         if (S_ISDIR(st.st_mode))
 621                 return DT_DIR;
 622         if (S_ISLNK(st.st_mode))
 623                 return DT_LNK;
 624         return dtype;
 625 }
 626
 627 /*
 628  * Read a directory tree. We currently ignore anything but
 629  * directories, regular files and symlinks. That's because git
 630  * doesn't handle them at all yet. Maybe that will change some
 631  * day.
 632  *
 633  * Also, we ignore the name ".git" (even if it is not a directory).
 634  * That likely will not change.
 635  */
 636 static int read_directory_recursive(struct dir_struct *dir, const char *base, int baselen, int check_only, const struct path_simplify *simplify)
 637 {
 638         DIR *fdir = opendir(*base ? base : ".");
 639         int contents = 0;
 640
 641         if (fdir) {
 642                 struct dirent *de;
 643                 char path[PATH_MAX + 1];
 644                 memcpy(path, base, baselen);
 645
 646                 while ((de = readdir(fdir)) != NULL) {
 647                         int len, dtype;
 648                         int exclude;
 649
 650                         if (is_dot_or_dotdot(de->d_name) ||
 651                              !strcmp(de->d_name, ".git"))
 652                                 continue;
 653                         len = strlen(de->d_name);
 654                         /* Ignore overly long pathnames! */
 655                         if (len + baselen + 8 > sizeof(path))
 656                                 continue;
 657                         memcpy(path + baselen, de->d_name, len+1);
 658                         len = baselen + len;
 659                         if (simplify_away(path, len, simplify))
 660                                 continue;
 661
 662                         dtype = DTYPE(de);
 663                         exclude = excluded(dir, path, &dtype);
 664                         if (exclude && (dir->flags & DIR_COLLECT_IGNORED)
 665                             && in_pathspec(path, len, simplify))
 666                                 dir_add_ignored(dir, path,len);
 667
 668                         /*
 669                          * Excluded? If we don't explicitly want to show
 670                          * ignored files, ignore it
 671                          */
 672                         if (exclude && !(dir->flags & DIR_SHOW_IGNORED))
 673                                 continue;
 674
 675                         if (dtype == DT_UNKNOWN)
 676                                 dtype = get_dtype(de, path, len);
 677
 678                         /*
 679                          * Do we want to see just the ignored files?
 680                          * We still need to recurse into directories,
 681                          * even if we don't ignore them, since the
 682                          * directory may contain files that we do..
 683                          */
 684                         if (!exclude && (dir->flags & DIR_SHOW_IGNORED)) {
 685                                 if (dtype != DT_DIR)
 686                                         continue;
 687                         }
 688
 689                         switch (dtype) {
 690                         default:
 691                                 continue;
 692                         case DT_DIR:
 693                                 memcpy(path + len, "/", 2);
 694                                 len++;
 695                                 switch (treat_directory(dir, path, len, simplify)) {
 696                                 case show_directory:
 697                                         if (exclude != !!(dir->flags
 698                                                         & DIR_SHOW_IGNORED))
 699                                                 continue;
 700                                         break;
 701                                 case recurse_into_directory:
 702                                         contents += read_directory_recursive(dir,
 703                                                 path, len, 0, simplify);
 704                                         continue;
 705                                 case ignore_directory:
 706                                         continue;
 707                                 }
 708                                 break;
 709                         case DT_REG:
 710                         case DT_LNK:
 711                                 break;
 712                         }
 713                         contents++;
 714                         if (check_only)
 715                                 goto exit_early;
 716                         else
 717                                 dir_add_name(dir, path, len);
 718                 }
 719 exit_early:
 720                 closedir(fdir);
 721         }
 722
 723         return contents;
 724 }
 725
 726 static int cmp_name(const void *p1, const void *p2)
 727 {
 728         const struct dir_entry *e1 = *(const struct dir_entry **)p1;
 729         const struct dir_entry *e2 = *(const struct dir_entry **)p2;
 730
 731         return cache_name_compare(e1->name, e1->len,
 732                                   e2->name, e2->len);
 733 }
 734
 735 /*
 736  * Return the length of the "simple" part of a path match limiter.
 737  */
 738 static int simple_length(const char *match)
 739 {
 740         int len = -1;
 741
 742         for (;;) {
 743                 unsigned char c = *match++;
 744                 len++;
 745                 if (c == '\0' || is_glob_special(c))
 746                         return len;
 747         }
 748 }
 749
 750 static struct path_simplify *create_simplify(const char **pathspec)
 751 {
 752         int nr, alloc = 0;
 753         struct path_simplify *simplify = NULL;
 754
 755         if (!pathspec)
 756                 return NULL;
 757
 758         for (nr = 0 ; ; nr++) {
 759                 const char *match;
 760                 if (nr >= alloc) {
 761                         alloc = alloc_nr(alloc);
 762                         simplify = xrealloc(simplify, alloc * sizeof(*simplify));
 763                 }
 764                 match = *pathspec++;
 765                 if (!match)
 766                         break;
 767                 simplify[nr].path = match;
 768                 simplify[nr].len = simple_length(match);
 769         }
 770         simplify[nr].path = NULL;
 771         simplify[nr].len = 0;
 772         return simplify;
 773 }
 774
 775 static void free_simplify(struct path_simplify *simplify)
 776 {
 777         free(simplify);
 778 }
 779
 780 int read_directory(struct dir_struct *dir, const char *path, int len, const char **pathspec)
 781 {
 782         struct path_simplify *simplify;
 783
 784         if (has_symlink_leading_path(path, len))
 785                 return dir->nr;
 786
 787         simplify = create_simplify(pathspec);
 788         read_directory_recursive(dir, path, len, 0, simplify);
 789         free_simplify(simplify);
 790         qsort(dir->entries, dir->nr, sizeof(struct dir_entry *), cmp_name);
 791         qsort(dir->ignored, dir->ignored_nr, sizeof(struct dir_entry *), cmp_name);
 792         return dir->nr;
 793 }
 794
 795 int file_exists(const char *f)
 796 {
 797         struct stat sb;
 798         return lstat(f, &sb) == 0;
 799 }
 800
 801 /*
 802  * get_relative_cwd() gets the prefix of the current working directory
 803  * relative to 'dir'.  If we are not inside 'dir', it returns NULL.
 804  *
 805  * As a convenience, it also returns NULL if 'dir' is already NULL.  The
 806  * reason for this behaviour is that it is natural for functions returning
 807  * directory names to return NULL to say "this directory does not exist"
 808  * or "this directory is invalid".  These cases are usually handled the
 809  * same as if the cwd is not inside 'dir' at all, so get_relative_cwd()
 810  * returns NULL for both of them.
 811  *
 812  * Most notably, get_relative_cwd(buffer, size, get_git_work_tree())
 813  * unifies the handling of "outside work tree" with "no work tree at all".
 814  */
 815 char *get_relative_cwd(char *buffer, int size, const char *dir)
 816 {
 817         char *cwd = buffer;
 818
 819         if (!dir)
 820                 return NULL;
 821         if (!getcwd(buffer, size))
 822                 die_errno("can't find the current directory");
 823
 824         if (!is_absolute_path(dir))
 825                 dir = make_absolute_path(dir);
 826
 827         while (*dir && *dir == *cwd) {
 828                 dir++;
 829                 cwd++;
 830         }
 831         if (*dir)
 832                 return NULL;
 833         if (*cwd == '/')
 834                 return cwd + 1;
 835         return cwd;
 836 }
 837
 838 int is_inside_dir(const char *dir)
 839 {
 840         char buffer[PATH_MAX];
 841         return get_relative_cwd(buffer, sizeof(buffer), dir) != NULL;
 842 }
 843
 844 int is_empty_dir(const char *path)
 845 {
 846         DIR *dir = opendir(path);
 847         struct dirent *e;
 848         int ret = 1;
 849
 850         if (!dir)
 851                 return 0;
 852
 853         while ((e = readdir(dir)) != NULL)
 854                 if (!is_dot_or_dotdot(e->d_name)) {
 855                         ret = 0;
 856                         break;
 857                 }
 858
 859         closedir(dir);
 860         return ret;
 861 }
 862
 863 int remove_dir_recursively(struct strbuf *path, int only_empty)
 864 {
 865         DIR *dir = opendir(path->buf);
 866         struct dirent *e;
 867         int ret = 0, original_len = path->len, len;
 868
 869         if (!dir)
 870                 return -1;
 871         if (path->buf[original_len - 1] != '/')
 872                 strbuf_addch(path, '/');
 873
 874         len = path->len;
 875         while ((e = readdir(dir)) != NULL) {
 876                 struct stat st;
 877                 if (is_dot_or_dotdot(e->d_name))
 878                         continue;
 879
 880                 strbuf_setlen(path, len);
 881                 strbuf_addstr(path, e->d_name);
 882                 if (lstat(path->buf, &st))
 883                         ; /* fall thru */
 884                 else if (S_ISDIR(st.st_mode)) {
 885                         if (!remove_dir_recursively(path, only_empty))
 886                                 continue; /* happy */
 887                 } else if (!only_empty && !unlink(path->buf))
 888                         continue; /* happy, too */
 889
 890                 /* path too long, stat fails, or non-directory still exists */
 891                 ret = -1;
 892                 break;
 893         }
 894         closedir(dir);
 895
 896         strbuf_setlen(path, original_len);
 897         if (!ret)
 898                 ret = rmdir(path->buf);
 899         return ret;
 900 }
 901
 902 void setup_standard_excludes(struct dir_struct *dir)
 903 {
 904         const char *path;
 905
 906         dir->exclude_per_dir = ".gitignore";
 907         path = git_path("info/exclude");
 908         if (!access(path, R_OK))
 909                 add_excludes_from_file(dir, path);
 910         if (excludes_file && !access(excludes_file, R_OK))
 911                 add_excludes_from_file(dir, excludes_file);
 912 }
 913
 914 int remove_path(const char *name)
 915 {
 916         char *slash;
 917
 918         if (unlink(name) && errno != ENOENT)
 919                 return -1;
 920
 921         slash = strrchr(name, '/');
 922         if (slash) {
 923                 char *dirs = xstrdup(name);
 924                 slash = dirs + (slash - name);
 925                 do {
 926                         *slash = '\0';
 927                 } while (rmdir(dirs) && (slash = strrchr(dirs, '/')));
 928                 free(dirs);
 929         }
 930         return 0;
 931 }
 932