wimlib.net Git - wimlib/blob - src/unix_capture.c

   1 /*
   2  * unix_capture.c:  Capture a directory tree on UNIX.
   3  */
   4
   5 /*
   6  * Copyright (C) 2012-2016 Eric Biggers
   7  *
   8  * This file is free software; you can redistribute it and/or modify it under
   9  * the terms of the GNU Lesser General Public License as published by the Free
  10  * Software Foundation; either version 3 of the License, or (at your option) any
  11  * later version.
  12  *
  13  * This file is distributed in the hope that it will be useful, but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  15  * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
  16  * details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public License
  19  * along with this file; if not, see http://www.gnu.org/licenses/.
  20  */
  21
  22 #ifndef __WIN32__
  23
  24 #ifdef HAVE_CONFIG_H
  25 #  include "config.h"
  26 #endif
  27
  28 #include <dirent.h>
  29 #include <errno.h>
  30 #include <fcntl.h>
  31 #include <limits.h> /* for PATH_MAX */
  32 #include <sys/stat.h>
  33 #include <sys/types.h>
  34 #ifdef HAVE_SYS_XATTR_H
  35 #  include <sys/xattr.h>
  36 #endif
  37 #include <unistd.h>
  38
  39 #include "wimlib/blob_table.h"
  40 #include "wimlib/dentry.h"
  41 #include "wimlib/error.h"
  42 #include "wimlib/reparse.h"
  43 #include "wimlib/scan.h"
  44 #include "wimlib/timestamp.h"
  45 #include "wimlib/unix_data.h"
  46 #include "wimlib/xattr.h"
  47
  48 #ifdef HAVE_FDOPENDIR
  49 #  define my_fdopendir(dirfd_p) fdopendir(*(dirfd_p))
  50 #else
  51 static DIR *
  52 my_fdopendir(int *dirfd_p)
  53 {
  54         DIR *dir = NULL;
  55         int old_pwd;
  56
  57         old_pwd = open(".", O_RDONLY);
  58         if (old_pwd >= 0) {
  59                 if (!fchdir(*dirfd_p)) {
  60                         dir = opendir(".");
  61                         if (dir) {
  62                                 close(*dirfd_p);
  63                                 *dirfd_p = dirfd(dir);
  64                         }
  65                         fchdir(old_pwd);
  66                 }
  67                 close(old_pwd);
  68         }
  69         return dir;
  70 }
  71 #endif
  72
  73 #ifdef HAVE_OPENAT
  74 #  define my_openat(full_path, dirfd, relpath, flags) \
  75                 openat((dirfd), (relpath), (flags))
  76 #else
  77 #  define my_openat(full_path, dirfd, relpath, flags) \
  78                 open((full_path), (flags))
  79 #endif
  80
  81 #ifdef HAVE_READLINKAT
  82 #  define my_readlinkat(full_path, dirfd, relpath, buf, bufsize) \
  83                 readlinkat((dirfd), (relpath), (buf), (bufsize))
  84 #else
  85 #  define my_readlinkat(full_path, dirfd, relpath, buf, bufsize) \
  86                 readlink((full_path), (buf), (bufsize))
  87 #endif
  88
  89 #ifdef HAVE_FSTATAT
  90 #  define my_fstatat(full_path, dirfd, relpath, stbuf, flags)   \
  91         fstatat((dirfd), (relpath), (stbuf), (flags))
  92 #else
  93 #  define my_fstatat(full_path, dirfd, relpath, stbuf, flags)   \
  94         ((flags) & AT_SYMLINK_NOFOLLOW) ? \
  95                 lstat((full_path), (stbuf)) : \
  96                 stat((full_path), (stbuf))
  97 #endif
  98
  99 #ifndef AT_FDCWD
 100 #  define AT_FDCWD      -100
 101 #endif
 102
 103 #ifndef AT_SYMLINK_NOFOLLOW
 104 #  define AT_SYMLINK_NOFOLLOW   0x100
 105 #endif
 106
 107 #ifdef HAVE_XATTR_SUPPORT
 108 /*
 109  * Retrieves the values of the xattrs named by the null-terminated @names of the
 110  * file at @path and serializes the xattr names and values into @entries.  If
 111  * successful, returns the number of bytes used in @entries.  If unsuccessful,
 112  * returns -1 and sets errno (ERANGE if @entries was too small).
 113  */
 114 static ssize_t
 115 gather_xattr_entries(const char *path, const char *names, size_t names_size,
 116                      void *entries, size_t entries_size)
 117 {
 118         const char * const names_end = names + names_size;
 119         void * const entries_end = entries + entries_size;
 120         const char *name = names;
 121         struct wimlib_xattr_entry *entry = entries;
 122
 123         wimlib_assert((uintptr_t)entries % 4 == 0 &&
 124                       entries_size % 4 == 0 && names_size != 0);
 125         do {
 126                 size_t name_len = strnlen(name, names_end - name);
 127                 void *value;
 128                 ssize_t value_len;
 129
 130                 if (name_len == 0 || name_len >= names_end - name ||
 131                     (u16)name_len != name_len)
 132                         goto malformed;
 133
 134                 /*
 135                  * Note: we take care to always call lgetxattr() with a nonzero
 136                  * size, since zero size means to return the value length only.
 137                  */
 138                 if (entries_end - (void *)entry <= sizeof(*entry) + name_len) {
 139                         errno = ERANGE;
 140                         return -1;
 141                 }
 142
 143                 entry->name_len = cpu_to_le16(name_len);
 144                 entry->reserved = cpu_to_le16(0);
 145                 value = mempcpy(entry->name, name, name_len);
 146
 147                 value_len = lgetxattr(path, name, value, entries_end - value);
 148                 if (value_len < 0) {
 149                         if (errno != ERANGE) {
 150                                 ERROR_WITH_ERRNO("\"%s\": unable to read "
 151                                                  "extended attribute \"%s\"",
 152                                                  path, name);
 153                         }
 154                         return -1;
 155                 }
 156                 if ((u32)value_len != value_len)
 157                         goto malformed;
 158                 entry->value_len = cpu_to_le32(value_len);
 159                 value += value_len;
 160
 161                 /* pad value to next 4-byte boundary */
 162                 memset(value, 0, -(uintptr_t)value & 3);
 163                 value += -(uintptr_t)value & 3;
 164
 165                 entry = value;
 166                 name += name_len + 1;
 167         } while (name < names_end);
 168
 169         return (void *)entry - entries;
 170
 171 malformed:
 172         errno = EINVAL;
 173         ERROR("\"%s\": malformed extended attribute name list", path);
 174         return -1;
 175 }
 176
 177 static int
 178 create_xattr_stream(const char *path, struct wim_inode *inode,
 179                     struct blob_table *blob_table,
 180                     const char *names, size_t names_size)
 181 {
 182         char _entries[1024] _aligned_attribute(4);
 183         char *entries = _entries;
 184         size_t entries_avail = ARRAY_LEN(_entries);
 185         ssize_t entries_size;
 186         struct wim_inode_stream *strm;
 187         int ret;
 188
 189 retry:
 190         /* Serialize the xattrs into @entries */
 191         entries_size = gather_xattr_entries(path, names, names_size,
 192                                             entries, entries_avail);
 193         if (entries_size < 0) {
 194                 ret = WIMLIB_ERR_STAT;
 195                 if (errno != ERANGE)
 196                         goto out;
 197                 /* Not enough space in @entries.  Reallocate it. */
 198                 if (entries != _entries)
 199                         FREE(entries);
 200                 ret = WIMLIB_ERR_NOMEM;
 201                 entries_avail *= 2;
 202                 entries = MALLOC(entries_avail);
 203                 if (!entries)
 204                         goto out;
 205                 goto retry;
 206         }
 207
 208         /* Add the xattr stream from the serialized xattrs in @entries */
 209         ret = WIMLIB_ERR_NOMEM;
 210         strm = inode_add_stream_with_data(inode, STREAM_TYPE_LINUX_XATTR,
 211                                           NO_STREAM_NAME, entries, entries_size,
 212                                           blob_table);
 213         if (!strm)
 214                 goto out;
 215
 216         if (!inode_set_linux_xattr_hash(inode, stream_hash(strm))) {
 217                 inode_remove_stream(inode, strm, blob_table);
 218                 goto out;
 219         }
 220
 221         ret = 0;
 222 out:
 223         if (entries != _entries)
 224                 FREE(entries);
 225         return ret;
 226 }
 227
 228 /*
 229  * If the file at @path has Linux-style extended attributes, read them into
 230  * memory and add them to @inode as a stream (deduplicated in @blob_table).
 231  */
 232 static noinline_for_stack int
 233 scan_linux_xattrs(const char *path, struct wim_inode *inode,
 234                   struct blob_table *blob_table)
 235 {
 236         char _names[1024];
 237         char *names = _names;
 238         ssize_t names_size = ARRAY_LEN(_names);
 239         int ret;
 240
 241 retry:
 242         /* Gather the names of the xattrs of the file at @path */
 243         ret = 0;
 244         names_size = llistxattr(path, names, names_size);
 245         if (names_size == 0) /* No xattrs? */
 246                 goto out;
 247         if (names_size < 0) {
 248                 ret = 0;
 249                 if (errno == ENOTSUP) /* No xattrs (unsupported or disabled)? */
 250                         goto out;
 251                 if (errno == ERANGE) {
 252                         /*
 253                          * Not enough space in @names.  Ask for how much space
 254                          * we need, then try again.
 255                          */
 256                         names_size = llistxattr(path, NULL, 0);
 257                         if (names_size >= 0) {
 258                                 if (names != _names)
 259                                         FREE(names);
 260                                 ret = WIMLIB_ERR_NOMEM;
 261                                 names = MALLOC(names_size);
 262                                 if (!names)
 263                                         goto out;
 264                                 goto retry;
 265                         }
 266                 }
 267                 WARNING_WITH_ERRNO("\"%s\": unable to list extended attributes",
 268                                    path);
 269                 ret = WIMLIB_ERR_STAT;
 270                 goto out;
 271         }
 272
 273         /*
 274          * We have a nonempty list of xattr names.  Gather the xattr values and
 275          * add the xattr stream.
 276          */
 277         ret = create_xattr_stream(path, inode, blob_table, names, names_size);
 278 out:
 279         if (names != _names)
 280                 FREE(names);
 281         return ret;
 282 }
 283 #endif /* HAVE_XATTR_SUPPORT */
 284
 285 static int
 286 unix_scan_regular_file(const char *path, u64 blocks, u64 size,
 287                        struct wim_inode *inode,
 288                        struct list_head *unhashed_blobs)
 289 {
 290         struct blob_descriptor *blob = NULL;
 291         struct wim_inode_stream *strm;
 292
 293         /*
 294          * Set FILE_ATTRIBUTE_SPARSE_FILE if the file uses less disk space than
 295          * expected given its size.
 296          */
 297         if (blocks < DIV_ROUND_UP(size, 512))
 298                 inode->i_attributes = FILE_ATTRIBUTE_SPARSE_FILE;
 299         else
 300                 inode->i_attributes = FILE_ATTRIBUTE_NORMAL;
 301
 302         if (size) {
 303                 blob = new_blob_descriptor();
 304                 if (unlikely(!blob))
 305                         goto err_nomem;
 306                 blob->file_on_disk = STRDUP(path);
 307                 if (unlikely(!blob->file_on_disk))
 308                         goto err_nomem;
 309                 blob->blob_location = BLOB_IN_FILE_ON_DISK;
 310                 blob->size = size;
 311                 blob->file_inode = inode;
 312         }
 313
 314         strm = inode_add_stream(inode, STREAM_TYPE_DATA, NO_STREAM_NAME, blob);
 315         if (unlikely(!strm))
 316                 goto err_nomem;
 317
 318         prepare_unhashed_blob(blob, inode, strm->stream_id, unhashed_blobs);
 319         return 0;
 320
 321 err_nomem:
 322         free_blob_descriptor(blob);
 323         return WIMLIB_ERR_NOMEM;
 324 }
 325
 326 static int
 327 unix_build_dentry_tree_recursive(struct wim_dentry **tree_ret,
 328                                  char *path, size_t path_len,
 329                                  int dirfd, const char *relpath,
 330                                  struct scan_params *params);
 331
 332 static int
 333 unix_scan_directory(struct wim_dentry *dir_dentry,
 334                     char *full_path, size_t full_path_len,
 335                     int parent_dirfd, const char *dir_relpath,
 336                     struct scan_params *params)
 337 {
 338
 339         int dirfd;
 340         DIR *dir;
 341         int ret;
 342
 343         dirfd = my_openat(full_path, parent_dirfd, dir_relpath, O_RDONLY);
 344         if (dirfd < 0) {
 345                 ERROR_WITH_ERRNO("\"%s\": Can't open directory", full_path);
 346                 return WIMLIB_ERR_OPENDIR;
 347         }
 348
 349         dir_dentry->d_inode->i_attributes = FILE_ATTRIBUTE_DIRECTORY;
 350         dir = my_fdopendir(&dirfd);
 351         if (!dir) {
 352                 ERROR_WITH_ERRNO("\"%s\": Can't open directory", full_path);
 353                 close(dirfd);
 354                 return WIMLIB_ERR_OPENDIR;
 355         }
 356
 357         ret = 0;
 358         for (;;) {
 359                 struct dirent *entry;
 360                 struct wim_dentry *child;
 361                 size_t name_len;
 362
 363                 errno = 0;
 364                 entry = readdir(dir);
 365                 if (!entry) {
 366                         if (errno) {
 367                                 ret = WIMLIB_ERR_READ;
 368                                 ERROR_WITH_ERRNO("\"%s\": Error reading directory",
 369                                                  full_path);
 370                         }
 371                         break;
 372                 }
 373
 374                 name_len = strlen(entry->d_name);
 375
 376                 if (should_ignore_filename(entry->d_name, name_len))
 377                         continue;
 378
 379                 full_path[full_path_len] = '/';
 380                 memcpy(&full_path[full_path_len + 1], entry->d_name, name_len + 1);
 381                 ret = unix_build_dentry_tree_recursive(&child,
 382                                                        full_path,
 383                                                        full_path_len + 1 + name_len,
 384                                                        dirfd,
 385                                                        &full_path[full_path_len + 1],
 386                                                        params);
 387                 full_path[full_path_len] = '\0';
 388                 if (ret)
 389                         break;
 390                 attach_scanned_tree(dir_dentry, child, params->blob_table);
 391         }
 392         closedir(dir);
 393         return ret;
 394 }
 395
 396 /*
 397  * Given an absolute symbolic link target (UNIX-style, beginning with '/'),
 398  * determine whether it points into the directory identified by @ino and @dev.
 399  * If yes, return the suffix of @target which is relative to this directory, but
 400  * retaining leading slashes.  If no, return @target.
 401  *
 402  * Here are some examples, assuming that the @ino/@dev directory is "/home/e":
 403  *
 404  *      Original target         New target
 405  *      ---------------         ----------
 406  *      /home/e/test            /test
 407  *      /home/e/test/           /test/
 408  *      //home//e//test//       //test//
 409  *      /home/e                                         (empty string)
 410  *      /home/e/                /
 411  *      /usr/lib                /usr/lib                (external link)
 412  *
 413  * Because of the possibility of other links into the @ino/@dev directory and/or
 414  * multiple path separators, we can't simply do a string comparison; instead we
 415  * need to stat() each ancestor directory.
 416  *
 417  * If the link points directly to the @ino/@dev directory with no trailing
 418  * slashes, then the new target will be an empty string.  This is not a valid
 419  * UNIX symlink target, but we store this in the archive anyway since the target
 420  * is intended to be de-relativized when the link is extracted.
 421  */
 422 static char *
 423 unix_relativize_link_target(char *target, u64 ino, u64 dev)
 424 {
 425         char *p = target;
 426
 427         do {
 428                 char save;
 429                 struct stat stbuf;
 430                 int ret;
 431
 432                 /* Skip slashes (guaranteed to be at least one here)  */
 433                 do {
 434                         p++;
 435                 } while (*p == '/');
 436
 437                 /* End of string?  */
 438                 if (!*p)
 439                         break;
 440
 441                 /* Skip non-slashes (guaranteed to be at least one here)  */
 442                 do {
 443                         p++;
 444                 } while (*p && *p != '/');
 445
 446                 /* Get the inode and device numbers for this prefix.  */
 447                 save = *p;
 448                 *p = '\0';
 449                 ret = stat(target, &stbuf);
 450                 *p = save;
 451
 452                 if (ret) {
 453                         /* stat() failed.  Assume the link points outside the
 454                          * directory tree being captured.  */
 455                         break;
 456                 }
 457
 458                 if (stbuf.st_ino == ino && stbuf.st_dev == dev) {
 459                         /* Link points inside directory tree being captured.
 460                          * Return abbreviated path.  */
 461                         return p;
 462                 }
 463         } while (*p);
 464
 465         /* Link does not point inside directory tree being captured.  */
 466         return target;
 467 }
 468
 469 static noinline_for_stack int
 470 unix_scan_symlink(const char *full_path, int dirfd, const char *relpath,
 471                   struct wim_inode *inode, struct scan_params *params)
 472 {
 473         char orig_target[REPARSE_POINT_MAX_SIZE];
 474         char *target = orig_target;
 475         int ret;
 476
 477         /* Read the UNIX symbolic link target.  */
 478         ret = my_readlinkat(full_path, dirfd, relpath, target,
 479                             sizeof(orig_target));
 480         if (unlikely(ret < 0)) {
 481                 ERROR_WITH_ERRNO("\"%s\": Can't read target of symbolic link",
 482                                  full_path);
 483                 return WIMLIB_ERR_READLINK;
 484         }
 485         if (unlikely(ret >= sizeof(orig_target))) {
 486                 ERROR("\"%s\": target of symbolic link is too long", full_path);
 487                 return WIMLIB_ERR_READLINK;
 488         }
 489         target[ret] = '\0';
 490
 491         /* If the link is absolute and reparse point fixups are enabled, then
 492          * change it to be "absolute" relative to the tree being captured.  */
 493         if (target[0] == '/' && (params->add_flags & WIMLIB_ADD_FLAG_RPFIX)) {
 494                 int status = WIMLIB_SCAN_DENTRY_NOT_FIXED_SYMLINK;
 495
 496                 params->progress.scan.cur_path = full_path;
 497                 params->progress.scan.symlink_target = target;
 498
 499                 target = unix_relativize_link_target(target,
 500                                                      params->capture_root_ino,
 501                                                      params->capture_root_dev);
 502                 if (target != orig_target) {
 503                         /* Link target was fixed.  */
 504                         inode->i_rp_flags &= ~WIM_RP_FLAG_NOT_FIXED;
 505                         status = WIMLIB_SCAN_DENTRY_FIXED_SYMLINK;
 506                 }
 507                 ret = do_scan_progress(params, status, NULL);
 508                 if (ret)
 509                         return ret;
 510         }
 511
 512         /* Translate the UNIX symlink target into a Windows reparse point.  */
 513         ret = wim_inode_set_symlink(inode, target, params->blob_table);
 514         if (unlikely(ret)) {
 515                 if (ret == WIMLIB_ERR_INVALID_UTF8_STRING) {
 516                         ERROR("\"%s\": target of symbolic link is not valid "
 517                               "UTF-8.  This is not supported.", full_path);
 518                 }
 519                 return ret;
 520         }
 521
 522         /* On Windows, a reparse point can be set on both directory and
 523          * non-directory files.  Usually, a link that is intended to point to a
 524          * (non-)directory is stored as a reparse point on a (non-)directory
 525          * file.  Replicate this behavior by examining the target file.  */
 526         struct stat stbuf;
 527         if (my_fstatat(full_path, dirfd, relpath, &stbuf, 0) == 0 &&
 528             S_ISDIR(stbuf.st_mode))
 529                 inode->i_attributes |= FILE_ATTRIBUTE_DIRECTORY;
 530         return 0;
 531 }
 532
 533 static int
 534 unix_build_dentry_tree_recursive(struct wim_dentry **tree_ret,
 535                                  char *full_path, size_t full_path_len,
 536                                  int dirfd, const char *relpath,
 537                                  struct scan_params *params)
 538 {
 539         struct wim_dentry *tree = NULL;
 540         struct wim_inode *inode = NULL;
 541         int ret;
 542         struct stat stbuf;
 543         int stat_flags;
 544
 545         ret = try_exclude(full_path, params);
 546         if (unlikely(ret < 0)) /* Excluded? */
 547                 goto out_progress;
 548         if (unlikely(ret > 0)) /* Error? */
 549                 goto out;
 550
 551         if (params->add_flags & (WIMLIB_ADD_FLAG_DEREFERENCE |
 552                                  WIMLIB_ADD_FLAG_ROOT))
 553                 stat_flags = 0;
 554         else
 555                 stat_flags = AT_SYMLINK_NOFOLLOW;
 556
 557         ret = my_fstatat(full_path, dirfd, relpath, &stbuf, stat_flags);
 558
 559         if (ret) {
 560                 ERROR_WITH_ERRNO("\"%s\": Can't read metadata", full_path);
 561                 ret = WIMLIB_ERR_STAT;
 562                 goto out;
 563         }
 564
 565         if (!(params->add_flags & WIMLIB_ADD_FLAG_UNIX_DATA)) {
 566                 if (unlikely(!S_ISREG(stbuf.st_mode) &&
 567                              !S_ISDIR(stbuf.st_mode) &&
 568                              !S_ISLNK(stbuf.st_mode)))
 569                 {
 570                         if (params->add_flags &
 571                             WIMLIB_ADD_FLAG_NO_UNSUPPORTED_EXCLUDE)
 572                         {
 573                                 ERROR("\"%s\": File type is unsupported",
 574                                       full_path);
 575                                 ret = WIMLIB_ERR_UNSUPPORTED_FILE;
 576                                 goto out;
 577                         }
 578                         params->progress.scan.cur_path = full_path;
 579                         ret = do_scan_progress(params,
 580                                                WIMLIB_SCAN_DENTRY_UNSUPPORTED,
 581                                                NULL);
 582                         goto out;
 583                 }
 584         }
 585
 586         ret = inode_table_new_dentry(params->inode_table, relpath,
 587                                      stbuf.st_ino, stbuf.st_dev, false, &tree);
 588         if (unlikely(ret)) {
 589                 if (ret == WIMLIB_ERR_INVALID_UTF8_STRING) {
 590                         ERROR("\"%s\": filename is not valid UTF-8.  "
 591                               "This is not supported.", full_path);
 592                 }
 593                 goto out;
 594         }
 595
 596         inode = tree->d_inode;
 597
 598         /* Already seen this inode?  */
 599         if (inode->i_nlink > 1)
 600                 goto out_progress;
 601
 602 #ifdef HAVE_STAT_NANOSECOND_PRECISION
 603         inode->i_creation_time = timespec_to_wim_timestamp(&stbuf.st_mtim);
 604         inode->i_last_write_time = timespec_to_wim_timestamp(&stbuf.st_mtim);
 605         inode->i_last_access_time = timespec_to_wim_timestamp(&stbuf.st_atim);
 606 #else
 607         inode->i_creation_time = time_t_to_wim_timestamp(stbuf.st_mtime);
 608         inode->i_last_write_time = time_t_to_wim_timestamp(stbuf.st_mtime);
 609         inode->i_last_access_time = time_t_to_wim_timestamp(stbuf.st_atime);
 610 #endif
 611         if (params->add_flags & WIMLIB_ADD_FLAG_UNIX_DATA) {
 612                 struct wimlib_unix_data unix_data;
 613
 614                 unix_data.uid = stbuf.st_uid;
 615                 unix_data.gid = stbuf.st_gid;
 616                 unix_data.mode = stbuf.st_mode;
 617                 unix_data.rdev = stbuf.st_rdev;
 618                 if (!inode_set_unix_data(inode, &unix_data, UNIX_DATA_ALL)) {
 619                         ret = WIMLIB_ERR_NOMEM;
 620                         goto out;
 621                 }
 622 #ifdef HAVE_XATTR_SUPPORT
 623                 ret = scan_linux_xattrs(full_path, inode, params->blob_table);
 624                 if (ret)
 625                         goto out;
 626 #endif
 627         }
 628
 629         if (params->add_flags & WIMLIB_ADD_FLAG_ROOT) {
 630                 params->capture_root_ino = stbuf.st_ino;
 631                 params->capture_root_dev = stbuf.st_dev;
 632                 params->add_flags &= ~WIMLIB_ADD_FLAG_ROOT;
 633         }
 634
 635         if (S_ISREG(stbuf.st_mode)) {
 636                 ret = unix_scan_regular_file(full_path, stbuf.st_blocks,
 637                                              stbuf.st_size, inode,
 638                                              params->unhashed_blobs);
 639         } else if (S_ISDIR(stbuf.st_mode)) {
 640                 ret = unix_scan_directory(tree, full_path, full_path_len,
 641                                           dirfd, relpath, params);
 642         } else if (S_ISLNK(stbuf.st_mode)) {
 643                 ret = unix_scan_symlink(full_path, dirfd, relpath,
 644                                         inode, params);
 645         }
 646
 647         if (ret)
 648                 goto out;
 649
 650 out_progress:
 651         params->progress.scan.cur_path = full_path;
 652         if (likely(tree))
 653                 ret = do_scan_progress(params, WIMLIB_SCAN_DENTRY_OK, inode);
 654         else
 655                 ret = do_scan_progress(params, WIMLIB_SCAN_DENTRY_EXCLUDED, NULL);
 656 out:
 657         if (unlikely(ret)) {
 658                 free_dentry_tree(tree, params->blob_table);
 659                 tree = NULL;
 660                 ret = report_scan_error(params, ret, full_path);
 661         }
 662         *tree_ret = tree;
 663         return ret;
 664 }
 665
 666 /*
 667  * unix_build_dentry_tree():
 668  *      Builds a tree of WIM dentries from an on-disk directory tree (UNIX
 669  *      version; no NTFS-specific data is captured).
 670  *
 671  * @root_ret:   Place to return a pointer to the root of the dentry tree.  Set
 672  *              to NULL if the file or directory was excluded from capture.
 673  *
 674  * @root_disk_path:  The path to the root of the directory tree on disk.
 675  *
 676  * @params:     See doc for `struct scan_params'.
 677  *
 678  * @return:     0 on success, nonzero on failure.  It is a failure if any of
 679  *              the files cannot be `stat'ed, or if any of the needed
 680  *              directories cannot be opened or read.  Failure to add the files
 681  *              to the WIM may still occur later when trying to actually read
 682  *              the on-disk files during a call to wimlib_write() or
 683  *              wimlib_overwrite().
 684  */
 685 int
 686 unix_build_dentry_tree(struct wim_dentry **root_ret,
 687                        const char *root_disk_path, struct scan_params *params)
 688 {
 689         size_t path_len;
 690         size_t path_bufsz;
 691         char *path_buf;
 692         int ret;
 693
 694         path_len = strlen(root_disk_path);
 695         path_bufsz = min(32790, PATH_MAX + 1);
 696
 697         if (path_len >= path_bufsz)
 698                 return WIMLIB_ERR_INVALID_PARAM;
 699
 700         path_buf = MALLOC(path_bufsz);
 701         if (!path_buf)
 702                 return WIMLIB_ERR_NOMEM;
 703         memcpy(path_buf, root_disk_path, path_len + 1);
 704
 705         params->capture_root_nchars = path_len;
 706
 707         ret = unix_build_dentry_tree_recursive(root_ret, path_buf, path_len,
 708                                                AT_FDCWD, path_buf, params);
 709         FREE(path_buf);
 710         return ret;
 711 }
 712
 713 #endif /* !__WIN32__ */