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                         ERROR("\"%s\": malformed extended attribute names list",
 133                               path);
 134                         errno = EINVAL;
 135                         return -1;
 136                 }
 137
 138                 /*
 139                  * Note: we take care to always call lgetxattr() with a nonzero
 140                  * size, since zero size means to return the value length only.
 141                  */
 142                 if (entries_end - (void *)entry <= sizeof(*entry) + name_len) {
 143                         errno = ERANGE;
 144                         return -1;
 145                 }
 146
 147                 entry->name_len = cpu_to_le16(name_len);
 148                 entry->reserved = 0;
 149                 value = mempcpy(entry->name, name, name_len);
 150
 151                 value_len = lgetxattr(path, name, value, entries_end - value);
 152                 if (value_len < 0) {
 153                         if (errno != ERANGE) {
 154                                 ERROR_WITH_ERRNO("\"%s\": unable to read extended attribute \"%s\"",
 155                                                  path, name);
 156                         }
 157                         return -1;
 158                 }
 159                 if ((u32)value_len != value_len) {
 160                         ERROR("\"%s\": value of extended attribute \"%s\" is too large",
 161                               path, name);
 162                         errno = EINVAL;
 163                         return -1;
 164                 }
 165                 entry->value_len = cpu_to_le32(value_len);
 166
 167                 /*
 168                  * Zero-pad the entry to the next 4-byte boundary.
 169                  * Note: because we've guaranteed that @entries_size is a
 170                  * multiple of 4, this cannot overflow the @entries buffer.
 171                  */
 172                 value += value_len;
 173                 while ((uintptr_t)value & 3) {
 174                         *(u8 *)value = 0;
 175                         value++;
 176                 }
 177
 178                 entry = value;
 179                 name += name_len + 1;
 180         } while (name < names_end);
 181
 182         return (void *)entry - entries;
 183 }
 184
 185 static int
 186 create_xattr_item(const char *path, struct wim_inode *inode,
 187                   const char *names, size_t names_size)
 188 {
 189         char _entries[1024] _aligned_attribute(4);
 190         char *entries = _entries;
 191         size_t entries_avail = ARRAY_LEN(_entries);
 192         ssize_t entries_size;
 193         int ret;
 194
 195 retry:
 196         /* Serialize the xattrs into @entries */
 197         entries_size = gather_xattr_entries(path, names, names_size,
 198                                             entries, entries_avail);
 199         if (entries_size < 0) {
 200                 ret = WIMLIB_ERR_STAT;
 201                 if (errno != ERANGE)
 202                         goto out;
 203                 /* Not enough space in @entries.  Reallocate it. */
 204                 if (entries != _entries)
 205                         FREE(entries);
 206                 ret = WIMLIB_ERR_NOMEM;
 207                 entries_avail *= 2;
 208                 entries = MALLOC(entries_avail);
 209                 if (!entries)
 210                         goto out;
 211                 goto retry;
 212         }
 213
 214         /* Copy @entries into an xattr item associated with @inode */
 215         if ((u32)entries_size != entries_size) {
 216                 ERROR("\"%s\": too much xattr data!", path);
 217                 ret = WIMLIB_ERR_STAT;
 218                 goto out;
 219         }
 220         ret = WIMLIB_ERR_NOMEM;
 221         if (!inode_set_linux_xattrs(inode, entries, entries_size))
 222                 goto out;
 223
 224         ret = 0;
 225 out:
 226         if (entries != _entries)
 227                 FREE(entries);
 228         return ret;
 229 }
 230
 231 /*
 232  * If the file at @path has Linux-style extended attributes, read them into
 233  * memory and add them to @inode as a tagged item.
 234  */
 235 static noinline_for_stack int
 236 scan_linux_xattrs(const char *path, struct wim_inode *inode)
 237 {
 238         char _names[256];
 239         char *names = _names;
 240         ssize_t names_size = ARRAY_LEN(_names);
 241         int ret = 0;
 242
 243 retry:
 244         /* Gather the names of the xattrs of the file at @path */
 245         names_size = llistxattr(path, names, names_size);
 246         if (names_size == 0) /* No xattrs? */
 247                 goto out;
 248         if (names_size < 0) {
 249                 /* xattrs unsupported or disabled? */
 250                 if (errno == ENOTSUP || errno == ENOSYS)
 251                         goto out;
 252                 if (errno == ERANGE) {
 253                         /*
 254                          * Not enough space in @names.  Ask for how much space
 255                          * we need, then try again.
 256                          */
 257                         names_size = llistxattr(path, NULL, 0);
 258                         if (names_size == 0)
 259                                 goto out;
 260                         if (names_size > 0) {
 261                                 if (names != _names)
 262                                         FREE(names);
 263                                 names = MALLOC(names_size);
 264                                 if (!names) {
 265                                         ret = WIMLIB_ERR_NOMEM;
 266                                         goto out;
 267                                 }
 268                                 goto retry;
 269                         }
 270                 }
 271                 /* Some other error occurred. */
 272                 ERROR_WITH_ERRNO("\"%s\": unable to list extended attributes",
 273                                  path);
 274                 ret = WIMLIB_ERR_STAT;
 275                 goto out;
 276         }
 277
 278         /*
 279          * We have a nonempty list of xattr names.  Gather the xattr values and
 280          * add them as a tagged item.
 281          */
 282         ret = create_xattr_item(path, inode, names, names_size);
 283 out:
 284         if (names != _names)
 285                 FREE(names);
 286         return ret;
 287 }
 288 #endif /* HAVE_XATTR_SUPPORT */
 289
 290 static int
 291 unix_scan_regular_file(const char *path, u64 blocks, u64 size,
 292                        struct wim_inode *inode,
 293                        struct list_head *unhashed_blobs)
 294 {
 295         struct blob_descriptor *blob = NULL;
 296         struct wim_inode_stream *strm;
 297
 298         /*
 299          * Set FILE_ATTRIBUTE_SPARSE_FILE if the file uses less disk space than
 300          * expected given its size.
 301          */
 302         if (blocks < DIV_ROUND_UP(size, 512))
 303                 inode->i_attributes = FILE_ATTRIBUTE_SPARSE_FILE;
 304         else
 305                 inode->i_attributes = FILE_ATTRIBUTE_NORMAL;
 306
 307         if (size) {
 308                 blob = new_blob_descriptor();
 309                 if (unlikely(!blob))
 310                         goto err_nomem;
 311                 blob->file_on_disk = STRDUP(path);
 312                 if (unlikely(!blob->file_on_disk))
 313                         goto err_nomem;
 314                 blob->blob_location = BLOB_IN_FILE_ON_DISK;
 315                 blob->size = size;
 316                 blob->file_inode = inode;
 317         }
 318
 319         strm = inode_add_stream(inode, STREAM_TYPE_DATA, NO_STREAM_NAME, blob);
 320         if (unlikely(!strm))
 321                 goto err_nomem;
 322
 323         prepare_unhashed_blob(blob, inode, strm->stream_id, unhashed_blobs);
 324         return 0;
 325
 326 err_nomem:
 327         free_blob_descriptor(blob);
 328         return WIMLIB_ERR_NOMEM;
 329 }
 330
 331 static int
 332 unix_build_dentry_tree_recursive(struct wim_dentry **tree_ret,
 333                                  char *path, size_t path_len,
 334                                  int dirfd, const char *relpath,
 335                                  struct scan_params *params);
 336
 337 static int
 338 unix_scan_directory(struct wim_dentry *dir_dentry,
 339                     char *full_path, size_t full_path_len,
 340                     int parent_dirfd, const char *dir_relpath,
 341                     struct scan_params *params)
 342 {
 343
 344         int dirfd;
 345         DIR *dir;
 346         int ret;
 347
 348         dirfd = my_openat(full_path, parent_dirfd, dir_relpath, O_RDONLY);
 349         if (dirfd < 0) {
 350                 ERROR_WITH_ERRNO("\"%s\": Can't open directory", full_path);
 351                 return WIMLIB_ERR_OPENDIR;
 352         }
 353
 354         dir_dentry->d_inode->i_attributes = FILE_ATTRIBUTE_DIRECTORY;
 355         dir = my_fdopendir(&dirfd);
 356         if (!dir) {
 357                 ERROR_WITH_ERRNO("\"%s\": Can't open directory", full_path);
 358                 close(dirfd);
 359                 return WIMLIB_ERR_OPENDIR;
 360         }
 361
 362         ret = 0;
 363         for (;;) {
 364                 struct dirent *entry;
 365                 struct wim_dentry *child;
 366                 size_t name_len;
 367
 368                 errno = 0;
 369                 entry = readdir(dir);
 370                 if (!entry) {
 371                         if (errno) {
 372                                 ret = WIMLIB_ERR_READ;
 373                                 ERROR_WITH_ERRNO("\"%s\": Error reading directory",
 374                                                  full_path);
 375                         }
 376                         break;
 377                 }
 378
 379                 name_len = strlen(entry->d_name);
 380
 381                 if (should_ignore_filename(entry->d_name, name_len))
 382                         continue;
 383
 384                 full_path[full_path_len] = '/';
 385                 memcpy(&full_path[full_path_len + 1], entry->d_name, name_len + 1);
 386                 ret = unix_build_dentry_tree_recursive(&child,
 387                                                        full_path,
 388                                                        full_path_len + 1 + name_len,
 389                                                        dirfd,
 390                                                        &full_path[full_path_len + 1],
 391                                                        params);
 392                 full_path[full_path_len] = '\0';
 393                 if (ret)
 394                         break;
 395                 attach_scanned_tree(dir_dentry, child, params->blob_table);
 396         }
 397         closedir(dir);
 398         return ret;
 399 }
 400
 401 /*
 402  * Given an absolute symbolic link target (UNIX-style, beginning with '/'),
 403  * determine whether it points into the directory identified by @ino and @dev.
 404  * If yes, return the suffix of @target which is relative to this directory, but
 405  * retaining leading slashes.  If no, return @target.
 406  *
 407  * Here are some examples, assuming that the @ino/@dev directory is "/home/e":
 408  *
 409  *      Original target         New target
 410  *      ---------------         ----------
 411  *      /home/e/test            /test
 412  *      /home/e/test/           /test/
 413  *      //home//e//test//       //test//
 414  *      /home/e                                         (empty string)
 415  *      /home/e/                /
 416  *      /usr/lib                /usr/lib                (external link)
 417  *
 418  * Because of the possibility of other links into the @ino/@dev directory and/or
 419  * multiple path separators, we can't simply do a string comparison; instead we
 420  * need to stat() each ancestor directory.
 421  *
 422  * If the link points directly to the @ino/@dev directory with no trailing
 423  * slashes, then the new target will be an empty string.  This is not a valid
 424  * UNIX symlink target, but we store this in the archive anyway since the target
 425  * is intended to be de-relativized when the link is extracted.
 426  */
 427 static char *
 428 unix_relativize_link_target(char *target, u64 ino, u64 dev)
 429 {
 430         char *p = target;
 431
 432         do {
 433                 char save;
 434                 struct stat stbuf;
 435                 int ret;
 436
 437                 /* Skip slashes (guaranteed to be at least one here)  */
 438                 do {
 439                         p++;
 440                 } while (*p == '/');
 441
 442                 /* End of string?  */
 443                 if (!*p)
 444                         break;
 445
 446                 /* Skip non-slashes (guaranteed to be at least one here)  */
 447                 do {
 448                         p++;
 449                 } while (*p && *p != '/');
 450
 451                 /* Get the inode and device numbers for this prefix.  */
 452                 save = *p;
 453                 *p = '\0';
 454                 ret = stat(target, &stbuf);
 455                 *p = save;
 456
 457                 if (ret) {
 458                         /* stat() failed.  Assume the link points outside the
 459                          * directory tree being captured.  */
 460                         break;
 461                 }
 462
 463                 if (stbuf.st_ino == ino && stbuf.st_dev == dev) {
 464                         /* Link points inside directory tree being captured.
 465                          * Return abbreviated path.  */
 466                         return p;
 467                 }
 468         } while (*p);
 469
 470         /* Link does not point inside directory tree being captured.  */
 471         return target;
 472 }
 473
 474 static noinline_for_stack int
 475 unix_scan_symlink(const char *full_path, int dirfd, const char *relpath,
 476                   struct wim_inode *inode, struct scan_params *params)
 477 {
 478         char orig_target[REPARSE_POINT_MAX_SIZE];
 479         char *target = orig_target;
 480         int ret;
 481
 482         /* Read the UNIX symbolic link target.  */
 483         ret = my_readlinkat(full_path, dirfd, relpath, target,
 484                             sizeof(orig_target));
 485         if (unlikely(ret < 0)) {
 486                 ERROR_WITH_ERRNO("\"%s\": Can't read target of symbolic link",
 487                                  full_path);
 488                 return WIMLIB_ERR_READLINK;
 489         }
 490         if (unlikely(ret >= sizeof(orig_target))) {
 491                 ERROR("\"%s\": target of symbolic link is too long", full_path);
 492                 return WIMLIB_ERR_READLINK;
 493         }
 494         target[ret] = '\0';
 495
 496         /* If the link is absolute and reparse point fixups are enabled, then
 497          * change it to be "absolute" relative to the tree being captured.  */
 498         if (target[0] == '/' && (params->add_flags & WIMLIB_ADD_FLAG_RPFIX)) {
 499                 int status = WIMLIB_SCAN_DENTRY_NOT_FIXED_SYMLINK;
 500
 501                 params->progress.scan.cur_path = full_path;
 502                 params->progress.scan.symlink_target = target;
 503
 504                 target = unix_relativize_link_target(target,
 505                                                      params->capture_root_ino,
 506                                                      params->capture_root_dev);
 507                 if (target != orig_target) {
 508                         /* Link target was fixed.  */
 509                         inode->i_rp_flags &= ~WIM_RP_FLAG_NOT_FIXED;
 510                         status = WIMLIB_SCAN_DENTRY_FIXED_SYMLINK;
 511                 }
 512                 ret = do_scan_progress(params, status, NULL);
 513                 if (ret)
 514                         return ret;
 515         }
 516
 517         /* Translate the UNIX symlink target into a Windows reparse point.  */
 518         ret = wim_inode_set_symlink(inode, target, params->blob_table);
 519         if (unlikely(ret)) {
 520                 if (ret == WIMLIB_ERR_INVALID_UTF8_STRING) {
 521                         ERROR("\"%s\": target of symbolic link is not valid "
 522                               "UTF-8.  This is not supported.", full_path);
 523                 }
 524                 return ret;
 525         }
 526
 527         /* On Windows, a reparse point can be set on both directory and
 528          * non-directory files.  Usually, a link that is intended to point to a
 529          * (non-)directory is stored as a reparse point on a (non-)directory
 530          * file.  Replicate this behavior by examining the target file.  */
 531         struct stat stbuf;
 532         if (my_fstatat(full_path, dirfd, relpath, &stbuf, 0) == 0 &&
 533             S_ISDIR(stbuf.st_mode))
 534                 inode->i_attributes |= FILE_ATTRIBUTE_DIRECTORY;
 535         return 0;
 536 }
 537
 538 static int
 539 unix_build_dentry_tree_recursive(struct wim_dentry **tree_ret,
 540                                  char *full_path, size_t full_path_len,
 541                                  int dirfd, const char *relpath,
 542                                  struct scan_params *params)
 543 {
 544         struct wim_dentry *tree = NULL;
 545         struct wim_inode *inode = NULL;
 546         int ret;
 547         struct stat stbuf;
 548         int stat_flags;
 549
 550         ret = try_exclude(full_path, params);
 551         if (unlikely(ret < 0)) /* Excluded? */
 552                 goto out_progress;
 553         if (unlikely(ret > 0)) /* Error? */
 554                 goto out;
 555
 556         if (params->add_flags & (WIMLIB_ADD_FLAG_DEREFERENCE |
 557                                  WIMLIB_ADD_FLAG_ROOT))
 558                 stat_flags = 0;
 559         else
 560                 stat_flags = AT_SYMLINK_NOFOLLOW;
 561
 562         ret = my_fstatat(full_path, dirfd, relpath, &stbuf, stat_flags);
 563
 564         if (ret) {
 565                 ERROR_WITH_ERRNO("\"%s\": Can't read metadata", full_path);
 566                 ret = WIMLIB_ERR_STAT;
 567                 goto out;
 568         }
 569
 570         if (!(params->add_flags & WIMLIB_ADD_FLAG_UNIX_DATA)) {
 571                 if (unlikely(!S_ISREG(stbuf.st_mode) &&
 572                              !S_ISDIR(stbuf.st_mode) &&
 573                              !S_ISLNK(stbuf.st_mode)))
 574                 {
 575                         if (params->add_flags &
 576                             WIMLIB_ADD_FLAG_NO_UNSUPPORTED_EXCLUDE)
 577                         {
 578                                 ERROR("\"%s\": File type is unsupported",
 579                                       full_path);
 580                                 ret = WIMLIB_ERR_UNSUPPORTED_FILE;
 581                                 goto out;
 582                         }
 583                         params->progress.scan.cur_path = full_path;
 584                         ret = do_scan_progress(params,
 585                                                WIMLIB_SCAN_DENTRY_UNSUPPORTED,
 586                                                NULL);
 587                         goto out;
 588                 }
 589         }
 590
 591         ret = inode_table_new_dentry(params->inode_table, relpath,
 592                                      stbuf.st_ino, stbuf.st_dev, false, &tree);
 593         if (unlikely(ret)) {
 594                 if (ret == WIMLIB_ERR_INVALID_UTF8_STRING) {
 595                         ERROR("\"%s\": filename is not valid UTF-8.  "
 596                               "This is not supported.", full_path);
 597                 }
 598                 goto out;
 599         }
 600
 601         inode = tree->d_inode;
 602
 603         /* Already seen this inode?  */
 604         if (inode->i_nlink > 1)
 605                 goto out_progress;
 606
 607 #ifdef HAVE_STAT_NANOSECOND_PRECISION
 608         inode->i_creation_time = timespec_to_wim_timestamp(&stbuf.st_mtim);
 609         inode->i_last_write_time = timespec_to_wim_timestamp(&stbuf.st_mtim);
 610         inode->i_last_access_time = timespec_to_wim_timestamp(&stbuf.st_atim);
 611 #else
 612         inode->i_creation_time = time_t_to_wim_timestamp(stbuf.st_mtime);
 613         inode->i_last_write_time = time_t_to_wim_timestamp(stbuf.st_mtime);
 614         inode->i_last_access_time = time_t_to_wim_timestamp(stbuf.st_atime);
 615 #endif
 616         if (params->add_flags & WIMLIB_ADD_FLAG_UNIX_DATA) {
 617                 struct wimlib_unix_data unix_data;
 618
 619                 unix_data.uid = stbuf.st_uid;
 620                 unix_data.gid = stbuf.st_gid;
 621                 unix_data.mode = stbuf.st_mode;
 622                 unix_data.rdev = stbuf.st_rdev;
 623                 if (!inode_set_unix_data(inode, &unix_data, UNIX_DATA_ALL)) {
 624                         ret = WIMLIB_ERR_NOMEM;
 625                         goto out;
 626                 }
 627 #ifdef HAVE_XATTR_SUPPORT
 628                 ret = scan_linux_xattrs(full_path, inode);
 629                 if (ret)
 630                         goto out;
 631 #endif
 632         }
 633
 634         if (params->add_flags & WIMLIB_ADD_FLAG_ROOT) {
 635                 params->capture_root_ino = stbuf.st_ino;
 636                 params->capture_root_dev = stbuf.st_dev;
 637                 params->add_flags &= ~WIMLIB_ADD_FLAG_ROOT;
 638         }
 639
 640         if (S_ISREG(stbuf.st_mode)) {
 641                 ret = unix_scan_regular_file(full_path, stbuf.st_blocks,
 642                                              stbuf.st_size, inode,
 643                                              params->unhashed_blobs);
 644         } else if (S_ISDIR(stbuf.st_mode)) {
 645                 ret = unix_scan_directory(tree, full_path, full_path_len,
 646                                           dirfd, relpath, params);
 647         } else if (S_ISLNK(stbuf.st_mode)) {
 648                 ret = unix_scan_symlink(full_path, dirfd, relpath,
 649                                         inode, params);
 650         }
 651
 652         if (ret)
 653                 goto out;
 654
 655 out_progress:
 656         params->progress.scan.cur_path = full_path;
 657         if (likely(tree))
 658                 ret = do_scan_progress(params, WIMLIB_SCAN_DENTRY_OK, inode);
 659         else
 660                 ret = do_scan_progress(params, WIMLIB_SCAN_DENTRY_EXCLUDED, NULL);
 661 out:
 662         if (unlikely(ret)) {
 663                 free_dentry_tree(tree, params->blob_table);
 664                 tree = NULL;
 665                 ret = report_scan_error(params, ret, full_path);
 666         }
 667         *tree_ret = tree;
 668         return ret;
 669 }
 670
 671 /*
 672  * unix_build_dentry_tree():
 673  *      Builds a tree of WIM dentries from an on-disk directory tree (UNIX
 674  *      version; no NTFS-specific data is captured).
 675  *
 676  * @root_ret:   Place to return a pointer to the root of the dentry tree.  Set
 677  *              to NULL if the file or directory was excluded from capture.
 678  *
 679  * @root_disk_path:  The path to the root of the directory tree on disk.
 680  *
 681  * @params:     See doc for `struct scan_params'.
 682  *
 683  * @return:     0 on success, nonzero on failure.  It is a failure if any of
 684  *              the files cannot be `stat'ed, or if any of the needed
 685  *              directories cannot be opened or read.  Failure to add the files
 686  *              to the WIM may still occur later when trying to actually read
 687  *              the on-disk files during a call to wimlib_write() or
 688  *              wimlib_overwrite().
 689  */
 690 int
 691 unix_build_dentry_tree(struct wim_dentry **root_ret,
 692                        const char *root_disk_path, struct scan_params *params)
 693 {
 694         size_t path_len;
 695         size_t path_bufsz;
 696         char *path_buf;
 697         int ret;
 698
 699         path_len = strlen(root_disk_path);
 700         path_bufsz = min(32790, PATH_MAX + 1);
 701
 702         if (path_len >= path_bufsz)
 703                 return WIMLIB_ERR_INVALID_PARAM;
 704
 705         path_buf = MALLOC(path_bufsz);
 706         if (!path_buf)
 707                 return WIMLIB_ERR_NOMEM;
 708         memcpy(path_buf, root_disk_path, path_len + 1);
 709
 710         params->capture_root_nchars = path_len;
 711
 712         ret = unix_build_dentry_tree_recursive(root_ret, path_buf, path_len,
 713                                                AT_FDCWD, path_buf, params);
 714         FREE(path_buf);
 715         return ret;
 716 }
 717
 718 #endif /* !__WIN32__ */