dir.con commit Merge commit 'v1.6.0' into jc/checkout-reflog-fix (4d9e42f)
   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,
  18        const char *path, const char *base, int baselen,
  19        int check_only, const struct path_simplify *simplify);
  20static int get_dtype(struct dirent *de, const char *path);
  21
  22int common_prefix(const char **pathspec)
  23{
  24        const char *path, *slash, *next;
  25        int prefix;
  26
  27        if (!pathspec)
  28                return 0;
  29
  30        path = *pathspec;
  31        slash = strrchr(path, '/');
  32        if (!slash)
  33                return 0;
  34
  35        prefix = slash - path + 1;
  36        while ((next = *++pathspec) != NULL) {
  37                int len = strlen(next);
  38                if (len >= prefix && !memcmp(path, next, prefix))
  39                        continue;
  40                len = prefix - 1;
  41                for (;;) {
  42                        if (!len)
  43                                return 0;
  44                        if (next[--len] != '/')
  45                                continue;
  46                        if (memcmp(path, next, len+1))
  47                                continue;
  48                        prefix = len + 1;
  49                        break;
  50                }
  51        }
  52        return prefix;
  53}
  54
  55static inline int special_char(unsigned char c1)
  56{
  57        return !c1 || c1 == '*' || c1 == '[' || c1 == '?' || c1 == '\\';
  58}
  59
  60/*
  61 * Does 'match' matches the given name?
  62 * A match is found if
  63 *
  64 * (1) the 'match' string is leading directory of 'name', or
  65 * (2) the 'match' string is a wildcard and matches 'name', or
  66 * (3) the 'match' string is exactly the same as 'name'.
  67 *
  68 * and the return value tells which case it was.
  69 *
  70 * It returns 0 when there is no match.
  71 */
  72static int match_one(const char *match, const char *name, int namelen)
  73{
  74        int matchlen;
  75
  76        /* If the match was just the prefix, we matched */
  77        if (!*match)
  78                return MATCHED_RECURSIVELY;
  79
  80        for (;;) {
  81                unsigned char c1 = *match;
  82                unsigned char c2 = *name;
  83                if (special_char(c1))
  84                        break;
  85                if (c1 != c2)
  86                        return 0;
  87                match++;
  88                name++;
  89                namelen--;
  90        }
  91
  92
  93        /*
  94         * If we don't match the matchstring exactly,
  95         * we need to match by fnmatch
  96         */
  97        matchlen = strlen(match);
  98        if (strncmp(match, name, matchlen))
  99                return !fnmatch(match, name, 0) ? MATCHED_FNMATCH : 0;
 100
 101        if (namelen == matchlen)
 102                return MATCHED_EXACTLY;
 103        if (match[matchlen-1] == '/' || name[matchlen] == '/')
 104                return MATCHED_RECURSIVELY;
 105        return 0;
 106}
 107
 108/*
 109 * Given a name and a list of pathspecs, see if the name matches
 110 * any of the pathspecs.  The caller is also interested in seeing
 111 * all pathspec matches some names it calls this function with
 112 * (otherwise the user could have mistyped the unmatched pathspec),
 113 * and a mark is left in seen[] array for pathspec element that
 114 * actually matched anything.
 115 */
 116int match_pathspec(const char **pathspec, const char *name, int namelen, int prefix, char *seen)
 117{
 118        int retval;
 119        const char *match;
 120
 121        name += prefix;
 122        namelen -= prefix;
 123
 124        for (retval = 0; (match = *pathspec++) != NULL; seen++) {
 125                int how;
 126                if (retval && *seen == MATCHED_EXACTLY)
 127                        continue;
 128                match += prefix;
 129                how = match_one(match, name, namelen);
 130                if (how) {
 131                        if (retval < how)
 132                                retval = how;
 133                        if (*seen < how)
 134                                *seen = how;
 135                }
 136        }
 137        return retval;
 138}
 139
 140static int no_wildcard(const char *string)
 141{
 142        return string[strcspn(string, "*?[{")] == '\0';
 143}
 144
 145void add_exclude(const char *string, const char *base,
 146                 int baselen, struct exclude_list *which)
 147{
 148        struct exclude *x;
 149        size_t len;
 150        int to_exclude = 1;
 151        int flags = 0;
 152
 153        if (*string == '!') {
 154                to_exclude = 0;
 155                string++;
 156        }
 157        len = strlen(string);
 158        if (len && string[len - 1] == '/') {
 159                char *s;
 160                x = xmalloc(sizeof(*x) + len);
 161                s = (char*)(x+1);
 162                memcpy(s, string, len - 1);
 163                s[len - 1] = '\0';
 164                string = s;
 165                x->pattern = s;
 166                flags = EXC_FLAG_MUSTBEDIR;
 167        } else {
 168                x = xmalloc(sizeof(*x));
 169                x->pattern = string;
 170        }
 171        x->to_exclude = to_exclude;
 172        x->patternlen = strlen(string);
 173        x->base = base;
 174        x->baselen = baselen;
 175        x->flags = flags;
 176        if (!strchr(string, '/'))
 177                x->flags |= EXC_FLAG_NODIR;
 178        if (no_wildcard(string))
 179                x->flags |= EXC_FLAG_NOWILDCARD;
 180        if (*string == '*' && no_wildcard(string+1))
 181                x->flags |= EXC_FLAG_ENDSWITH;
 182        ALLOC_GROW(which->excludes, which->nr + 1, which->alloc);
 183        which->excludes[which->nr++] = x;
 184}
 185
 186static int add_excludes_from_file_1(const char *fname,
 187                                    const char *base,
 188                                    int baselen,
 189                                    char **buf_p,
 190                                    struct exclude_list *which)
 191{
 192        struct stat st;
 193        int fd, i;
 194        size_t size;
 195        char *buf, *entry;
 196
 197        fd = open(fname, O_RDONLY);
 198        if (fd < 0 || fstat(fd, &st) < 0)
 199                goto err;
 200        size = xsize_t(st.st_size);
 201        if (size == 0) {
 202                close(fd);
 203                return 0;
 204        }
 205        buf = xmalloc(size+1);
 206        if (read_in_full(fd, buf, size) != size)
 207        {
 208                free(buf);
 209                goto err;
 210        }
 211        close(fd);
 212
 213        if (buf_p)
 214                *buf_p = buf;
 215        buf[size++] = '\n';
 216        entry = buf;
 217        for (i = 0; i < size; i++) {
 218                if (buf[i] == '\n') {
 219                        if (entry != buf + i && entry[0] != '#') {
 220                                buf[i - (i && buf[i-1] == '\r')] = 0;
 221                                add_exclude(entry, base, baselen, which);
 222                        }
 223                        entry = buf + i + 1;
 224                }
 225        }
 226        return 0;
 227
 228 err:
 229        if (0 <= fd)
 230                close(fd);
 231        return -1;
 232}
 233
 234void add_excludes_from_file(struct dir_struct *dir, const char *fname)
 235{
 236        if (add_excludes_from_file_1(fname, "", 0, NULL,
 237                                     &dir->exclude_list[EXC_FILE]) < 0)
 238                die("cannot use %s as an exclude file", fname);
 239}
 240
 241static void prep_exclude(struct dir_struct *dir, const char *base, int baselen)
 242{
 243        struct exclude_list *el;
 244        struct exclude_stack *stk = NULL;
 245        int current;
 246
 247        if ((!dir->exclude_per_dir) ||
 248            (baselen + strlen(dir->exclude_per_dir) >= PATH_MAX))
 249                return; /* too long a path -- ignore */
 250
 251        /* Pop the ones that are not the prefix of the path being checked. */
 252        el = &dir->exclude_list[EXC_DIRS];
 253        while ((stk = dir->exclude_stack) != NULL) {
 254                if (stk->baselen <= baselen &&
 255                    !strncmp(dir->basebuf, base, stk->baselen))
 256                        break;
 257                dir->exclude_stack = stk->prev;
 258                while (stk->exclude_ix < el->nr)
 259                        free(el->excludes[--el->nr]);
 260                free(stk->filebuf);
 261                free(stk);
 262        }
 263
 264        /* Read from the parent directories and push them down. */
 265        current = stk ? stk->baselen : -1;
 266        while (current < baselen) {
 267                struct exclude_stack *stk = xcalloc(1, sizeof(*stk));
 268                const char *cp;
 269
 270                if (current < 0) {
 271                        cp = base;
 272                        current = 0;
 273                }
 274                else {
 275                        cp = strchr(base + current + 1, '/');
 276                        if (!cp)
 277                                die("oops in prep_exclude");
 278                        cp++;
 279                }
 280                stk->prev = dir->exclude_stack;
 281                stk->baselen = cp - base;
 282                stk->exclude_ix = el->nr;
 283                memcpy(dir->basebuf + current, base + current,
 284                       stk->baselen - current);
 285                strcpy(dir->basebuf + stk->baselen, dir->exclude_per_dir);
 286                add_excludes_from_file_1(dir->basebuf,
 287                                         dir->basebuf, stk->baselen,
 288                                         &stk->filebuf, el);
 289                dir->exclude_stack = stk;
 290                current = stk->baselen;
 291        }
 292        dir->basebuf[baselen] = '\0';
 293}
 294
 295/* Scan the list and let the last match determines the fate.
 296 * Return 1 for exclude, 0 for include and -1 for undecided.
 297 */
 298static int excluded_1(const char *pathname,
 299                      int pathlen, const char *basename, int *dtype,
 300                      struct exclude_list *el)
 301{
 302        int i;
 303
 304        if (el->nr) {
 305                for (i = el->nr - 1; 0 <= i; i--) {
 306                        struct exclude *x = el->excludes[i];
 307                        const char *exclude = x->pattern;
 308                        int to_exclude = x->to_exclude;
 309
 310                        if (x->flags & EXC_FLAG_MUSTBEDIR) {
 311                                if (*dtype == DT_UNKNOWN)
 312                                        *dtype = get_dtype(NULL, pathname);
 313                                if (*dtype != DT_DIR)
 314                                        continue;
 315                        }
 316
 317                        if (x->flags & EXC_FLAG_NODIR) {
 318                                /* match basename */
 319                                if (x->flags & EXC_FLAG_NOWILDCARD) {
 320                                        if (!strcmp(exclude, basename))
 321                                                return to_exclude;
 322                                } else if (x->flags & EXC_FLAG_ENDSWITH) {
 323                                        if (x->patternlen - 1 <= pathlen &&
 324                                            !strcmp(exclude + 1, pathname + pathlen - x->patternlen + 1))
 325                                                return to_exclude;
 326                                } else {
 327                                        if (fnmatch(exclude, basename, 0) == 0)
 328                                                return to_exclude;
 329                                }
 330                        }
 331                        else {
 332                                /* match with FNM_PATHNAME:
 333                                 * exclude has base (baselen long) implicitly
 334                                 * in front of it.
 335                                 */
 336                                int baselen = x->baselen;
 337                                if (*exclude == '/')
 338                                        exclude++;
 339
 340                                if (pathlen < baselen ||
 341                                    (baselen && pathname[baselen-1] != '/') ||
 342                                    strncmp(pathname, x->base, baselen))
 343                                    continue;
 344
 345                                if (x->flags & EXC_FLAG_NOWILDCARD) {
 346                                        if (!strcmp(exclude, pathname + baselen))
 347                                                return to_exclude;
 348                                } else {
 349                                        if (fnmatch(exclude, pathname+baselen,
 350                                                    FNM_PATHNAME) == 0)
 351                                            return to_exclude;
 352                                }
 353                        }
 354                }
 355        }
 356        return -1; /* undecided */
 357}
 358
 359int excluded(struct dir_struct *dir, const char *pathname, int *dtype_p)
 360{
 361        int pathlen = strlen(pathname);
 362        int st;
 363        const char *basename = strrchr(pathname, '/');
 364        basename = (basename) ? basename+1 : pathname;
 365
 366        prep_exclude(dir, pathname, basename-pathname);
 367        for (st = EXC_CMDL; st <= EXC_FILE; st++) {
 368                switch (excluded_1(pathname, pathlen, basename,
 369                                   dtype_p, &dir->exclude_list[st])) {
 370                case 0:
 371                        return 0;
 372                case 1:
 373                        return 1;
 374                }
 375        }
 376        return 0;
 377}
 378
 379static struct dir_entry *dir_entry_new(const char *pathname, int len)
 380{
 381        struct dir_entry *ent;
 382
 383        ent = xmalloc(sizeof(*ent) + len + 1);
 384        ent->len = len;
 385        memcpy(ent->name, pathname, len);
 386        ent->name[len] = 0;
 387        return ent;
 388}
 389
 390struct dir_entry *dir_add_name(struct dir_struct *dir, const char *pathname, int len)
 391{
 392        if (cache_name_exists(pathname, len, ignore_case))
 393                return NULL;
 394
 395        ALLOC_GROW(dir->entries, dir->nr+1, dir->alloc);
 396        return dir->entries[dir->nr++] = dir_entry_new(pathname, len);
 397}
 398
 399struct dir_entry *dir_add_ignored(struct dir_struct *dir, const char *pathname, int len)
 400{
 401        if (cache_name_pos(pathname, len) >= 0)
 402                return NULL;
 403
 404        ALLOC_GROW(dir->ignored, dir->ignored_nr+1, dir->ignored_alloc);
 405        return dir->ignored[dir->ignored_nr++] = dir_entry_new(pathname, len);
 406}
 407
 408enum exist_status {
 409        index_nonexistent = 0,
 410        index_directory,
 411        index_gitdir,
 412};
 413
 414/*
 415 * The index sorts alphabetically by entry name, which
 416 * means that a gitlink sorts as '\0' at the end, while
 417 * a directory (which is defined not as an entry, but as
 418 * the files it contains) will sort with the '/' at the
 419 * end.
 420 */
 421static enum exist_status directory_exists_in_index(const char *dirname, int len)
 422{
 423        int pos = cache_name_pos(dirname, len);
 424        if (pos < 0)
 425                pos = -pos-1;
 426        while (pos < active_nr) {
 427                struct cache_entry *ce = active_cache[pos++];
 428                unsigned char endchar;
 429
 430                if (strncmp(ce->name, dirname, len))
 431                        break;
 432                endchar = ce->name[len];
 433                if (endchar > '/')
 434                        break;
 435                if (endchar == '/')
 436                        return index_directory;
 437                if (!endchar && S_ISGITLINK(ce->ce_mode))
 438                        return index_gitdir;
 439        }
 440        return index_nonexistent;
 441}
 442
 443/*
 444 * When we find a directory when traversing the filesystem, we
 445 * have three distinct cases:
 446 *
 447 *  - ignore it
 448 *  - see it as a directory
 449 *  - recurse into it
 450 *
 451 * and which one we choose depends on a combination of existing
 452 * git index contents and the flags passed into the directory
 453 * traversal routine.
 454 *
 455 * Case 1: If we *already* have entries in the index under that
 456 * directory name, we always recurse into the directory to see
 457 * all the files.
 458 *
 459 * Case 2: If we *already* have that directory name as a gitlink,
 460 * we always continue to see it as a gitlink, regardless of whether
 461 * there is an actual git directory there or not (it might not
 462 * be checked out as a subproject!)
 463 *
 464 * Case 3: if we didn't have it in the index previously, we
 465 * have a few sub-cases:
 466 *
 467 *  (a) if "show_other_directories" is true, we show it as
 468 *      just a directory, unless "hide_empty_directories" is
 469 *      also true and the directory is empty, in which case
 470 *      we just ignore it entirely.
 471 *  (b) if it looks like a git directory, and we don't have
 472 *      'no_gitlinks' set we treat it as a gitlink, and show it
 473 *      as a directory.
 474 *  (c) otherwise, we recurse into it.
 475 */
 476enum directory_treatment {
 477        show_directory,
 478        ignore_directory,
 479        recurse_into_directory,
 480};
 481
 482static enum directory_treatment treat_directory(struct dir_struct *dir,
 483        const char *dirname, int len,
 484        const struct path_simplify *simplify)
 485{
 486        /* The "len-1" is to strip the final '/' */
 487        switch (directory_exists_in_index(dirname, len-1)) {
 488        case index_directory:
 489                return recurse_into_directory;
 490
 491        case index_gitdir:
 492                if (dir->show_other_directories)
 493                        return ignore_directory;
 494                return show_directory;
 495
 496        case index_nonexistent:
 497                if (dir->show_other_directories)
 498                        break;
 499                if (!dir->no_gitlinks) {
 500                        unsigned char sha1[20];
 501                        if (resolve_gitlink_ref(dirname, "HEAD", sha1) == 0)
 502                                return show_directory;
 503                }
 504                return recurse_into_directory;
 505        }
 506
 507        /* This is the "show_other_directories" case */
 508        if (!dir->hide_empty_directories)
 509                return show_directory;
 510        if (!read_directory_recursive(dir, dirname, dirname, len, 1, simplify))
 511                return ignore_directory;
 512        return show_directory;
 513}
 514
 515/*
 516 * This is an inexact early pruning of any recursive directory
 517 * reading - if the path cannot possibly be in the pathspec,
 518 * return true, and we'll skip it early.
 519 */
 520static int simplify_away(const char *path, int pathlen, const struct path_simplify *simplify)
 521{
 522        if (simplify) {
 523                for (;;) {
 524                        const char *match = simplify->path;
 525                        int len = simplify->len;
 526
 527                        if (!match)
 528                                break;
 529                        if (len > pathlen)
 530                                len = pathlen;
 531                        if (!memcmp(path, match, len))
 532                                return 0;
 533                        simplify++;
 534                }
 535                return 1;
 536        }
 537        return 0;
 538}
 539
 540static int in_pathspec(const char *path, int len, const struct path_simplify *simplify)
 541{
 542        if (simplify) {
 543                for (; simplify->path; simplify++) {
 544                        if (len == simplify->len
 545                            && !memcmp(path, simplify->path, len))
 546                                return 1;
 547                }
 548        }
 549        return 0;
 550}
 551
 552static int get_dtype(struct dirent *de, const char *path)
 553{
 554        int dtype = de ? DTYPE(de) : DT_UNKNOWN;
 555        struct stat st;
 556
 557        if (dtype != DT_UNKNOWN)
 558                return dtype;
 559        if (lstat(path, &st))
 560                return dtype;
 561        if (S_ISREG(st.st_mode))
 562                return DT_REG;
 563        if (S_ISDIR(st.st_mode))
 564                return DT_DIR;
 565        if (S_ISLNK(st.st_mode))
 566                return DT_LNK;
 567        return dtype;
 568}
 569
 570/*
 571 * Read a directory tree. We currently ignore anything but
 572 * directories, regular files and symlinks. That's because git
 573 * doesn't handle them at all yet. Maybe that will change some
 574 * day.
 575 *
 576 * Also, we ignore the name ".git" (even if it is not a directory).
 577 * That likely will not change.
 578 */
 579static int read_directory_recursive(struct dir_struct *dir, const char *path, const char *base, int baselen, int check_only, const struct path_simplify *simplify)
 580{
 581        DIR *fdir = opendir(path);
 582        int contents = 0;
 583
 584        if (fdir) {
 585                struct dirent *de;
 586                char fullname[PATH_MAX + 1];
 587                memcpy(fullname, base, baselen);
 588
 589                while ((de = readdir(fdir)) != NULL) {
 590                        int len, dtype;
 591                        int exclude;
 592
 593                        if ((de->d_name[0] == '.') &&
 594                            (de->d_name[1] == 0 ||
 595                             !strcmp(de->d_name + 1, ".") ||
 596                             !strcmp(de->d_name + 1, "git")))
 597                                continue;
 598                        len = strlen(de->d_name);
 599                        /* Ignore overly long pathnames! */
 600                        if (len + baselen + 8 > sizeof(fullname))
 601                                continue;
 602                        memcpy(fullname + baselen, de->d_name, len+1);
 603                        if (simplify_away(fullname, baselen + len, simplify))
 604                                continue;
 605
 606                        dtype = DTYPE(de);
 607                        exclude = excluded(dir, fullname, &dtype);
 608                        if (exclude && dir->collect_ignored
 609                            && in_pathspec(fullname, baselen + len, simplify))
 610                                dir_add_ignored(dir, fullname, baselen + len);
 611
 612                        /*
 613                         * Excluded? If we don't explicitly want to show
 614                         * ignored files, ignore it
 615                         */
 616                        if (exclude && !dir->show_ignored)
 617                                continue;
 618
 619                        if (dtype == DT_UNKNOWN)
 620                                dtype = get_dtype(de, fullname);
 621
 622                        /*
 623                         * Do we want to see just the ignored files?
 624                         * We still need to recurse into directories,
 625                         * even if we don't ignore them, since the
 626                         * directory may contain files that we do..
 627                         */
 628                        if (!exclude && dir->show_ignored) {
 629                                if (dtype != DT_DIR)
 630                                        continue;
 631                        }
 632
 633                        switch (dtype) {
 634                        default:
 635                                continue;
 636                        case DT_DIR:
 637                                memcpy(fullname + baselen + len, "/", 2);
 638                                len++;
 639                                switch (treat_directory(dir, fullname, baselen + len, simplify)) {
 640                                case show_directory:
 641                                        if (exclude != dir->show_ignored)
 642                                                continue;
 643                                        break;
 644                                case recurse_into_directory:
 645                                        contents += read_directory_recursive(dir,
 646                                                fullname, fullname, baselen + len, 0, simplify);
 647                                        continue;
 648                                case ignore_directory:
 649                                        continue;
 650                                }
 651                                break;
 652                        case DT_REG:
 653                        case DT_LNK:
 654                                break;
 655                        }
 656                        contents++;
 657                        if (check_only)
 658                                goto exit_early;
 659                        else
 660                                dir_add_name(dir, fullname, baselen + len);
 661                }
 662exit_early:
 663                closedir(fdir);
 664        }
 665
 666        return contents;
 667}
 668
 669static int cmp_name(const void *p1, const void *p2)
 670{
 671        const struct dir_entry *e1 = *(const struct dir_entry **)p1;
 672        const struct dir_entry *e2 = *(const struct dir_entry **)p2;
 673
 674        return cache_name_compare(e1->name, e1->len,
 675                                  e2->name, e2->len);
 676}
 677
 678/*
 679 * Return the length of the "simple" part of a path match limiter.
 680 */
 681static int simple_length(const char *match)
 682{
 683        const char special[256] = {
 684                [0] = 1, ['?'] = 1,
 685                ['\\'] = 1, ['*'] = 1,
 686                ['['] = 1
 687        };
 688        int len = -1;
 689
 690        for (;;) {
 691                unsigned char c = *match++;
 692                len++;
 693                if (special[c])
 694                        return len;
 695        }
 696}
 697
 698static struct path_simplify *create_simplify(const char **pathspec)
 699{
 700        int nr, alloc = 0;
 701        struct path_simplify *simplify = NULL;
 702
 703        if (!pathspec)
 704                return NULL;
 705
 706        for (nr = 0 ; ; nr++) {
 707                const char *match;
 708                if (nr >= alloc) {
 709                        alloc = alloc_nr(alloc);
 710                        simplify = xrealloc(simplify, alloc * sizeof(*simplify));
 711                }
 712                match = *pathspec++;
 713                if (!match)
 714                        break;
 715                simplify[nr].path = match;
 716                simplify[nr].len = simple_length(match);
 717        }
 718        simplify[nr].path = NULL;
 719        simplify[nr].len = 0;
 720        return simplify;
 721}
 722
 723static void free_simplify(struct path_simplify *simplify)
 724{
 725        free(simplify);
 726}
 727
 728int read_directory(struct dir_struct *dir, const char *path, const char *base, int baselen, const char **pathspec)
 729{
 730        struct path_simplify *simplify = create_simplify(pathspec);
 731
 732        read_directory_recursive(dir, path, base, baselen, 0, simplify);
 733        free_simplify(simplify);
 734        qsort(dir->entries, dir->nr, sizeof(struct dir_entry *), cmp_name);
 735        qsort(dir->ignored, dir->ignored_nr, sizeof(struct dir_entry *), cmp_name);
 736        return dir->nr;
 737}
 738
 739int file_exists(const char *f)
 740{
 741        struct stat sb;
 742        return lstat(f, &sb) == 0;
 743}
 744
 745/*
 746 * get_relative_cwd() gets the prefix of the current working directory
 747 * relative to 'dir'.  If we are not inside 'dir', it returns NULL.
 748 *
 749 * As a convenience, it also returns NULL if 'dir' is already NULL.  The
 750 * reason for this behaviour is that it is natural for functions returning
 751 * directory names to return NULL to say "this directory does not exist"
 752 * or "this directory is invalid".  These cases are usually handled the
 753 * same as if the cwd is not inside 'dir' at all, so get_relative_cwd()
 754 * returns NULL for both of them.
 755 *
 756 * Most notably, get_relative_cwd(buffer, size, get_git_work_tree())
 757 * unifies the handling of "outside work tree" with "no work tree at all".
 758 */
 759char *get_relative_cwd(char *buffer, int size, const char *dir)
 760{
 761        char *cwd = buffer;
 762
 763        if (!dir)
 764                return NULL;
 765        if (!getcwd(buffer, size))
 766                die("can't find the current directory: %s", strerror(errno));
 767
 768        if (!is_absolute_path(dir))
 769                dir = make_absolute_path(dir);
 770
 771        while (*dir && *dir == *cwd) {
 772                dir++;
 773                cwd++;
 774        }
 775        if (*dir)
 776                return NULL;
 777        if (*cwd == '/')
 778                return cwd + 1;
 779        return cwd;
 780}
 781
 782int is_inside_dir(const char *dir)
 783{
 784        char buffer[PATH_MAX];
 785        return get_relative_cwd(buffer, sizeof(buffer), dir) != NULL;
 786}
 787
 788int remove_dir_recursively(struct strbuf *path, int only_empty)
 789{
 790        DIR *dir = opendir(path->buf);
 791        struct dirent *e;
 792        int ret = 0, original_len = path->len, len;
 793
 794        if (!dir)
 795                return -1;
 796        if (path->buf[original_len - 1] != '/')
 797                strbuf_addch(path, '/');
 798
 799        len = path->len;
 800        while ((e = readdir(dir)) != NULL) {
 801                struct stat st;
 802                if ((e->d_name[0] == '.') &&
 803                    ((e->d_name[1] == 0) ||
 804                     ((e->d_name[1] == '.') && e->d_name[2] == 0)))
 805                        continue; /* "." and ".." */
 806
 807                strbuf_setlen(path, len);
 808                strbuf_addstr(path, e->d_name);
 809                if (lstat(path->buf, &st))
 810                        ; /* fall thru */
 811                else if (S_ISDIR(st.st_mode)) {
 812                        if (!remove_dir_recursively(path, only_empty))
 813                                continue; /* happy */
 814                } else if (!only_empty && !unlink(path->buf))
 815                        continue; /* happy, too */
 816
 817                /* path too long, stat fails, or non-directory still exists */
 818                ret = -1;
 819                break;
 820        }
 821        closedir(dir);
 822
 823        strbuf_setlen(path, original_len);
 824        if (!ret)
 825                ret = rmdir(path->buf);
 826        return ret;
 827}
 828
 829void setup_standard_excludes(struct dir_struct *dir)
 830{
 831        const char *path;
 832
 833        dir->exclude_per_dir = ".gitignore";
 834        path = git_path("info/exclude");
 835        if (!access(path, R_OK))
 836                add_excludes_from_file(dir, path);
 837        if (excludes_file && !access(excludes_file, R_OK))
 838                add_excludes_from_file(dir, excludes_file);
 839}