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

   1 /*
   2  * update_image.c - Update a WIM image.
   3  */
   4
   5 /*
   6  * Copyright (C) 2013, 2014 Eric Biggers
   7  *
   8  * This file is part of wimlib, a library for working with WIM files.
   9  *
  10  * wimlib is free software; you can redistribute it and/or modify it under the
  11  * terms of the GNU General Public License as published by the Free
  12  * Software Foundation; either version 3 of the License, or (at your option)
  13  * any later version.
  14  *
  15  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  16  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  17  * A PARTICULAR PURPOSE. See the GNU General Public License for more
  18  * details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  22  */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #  include "config.h"
  26 #endif
  27
  28 #include "wimlib/capture.h"
  29 #include "wimlib/dentry.h"
  30 #include "wimlib/encoding.h"
  31 #include "wimlib/error.h"
  32 #include "wimlib/lookup_table.h"
  33 #include "wimlib/metadata.h"
  34 #ifdef WITH_NTFS_3G
  35 #  include "wimlib/ntfs_3g.h" /* for do_ntfs_umount() */
  36 #endif
  37 #include "wimlib/paths.h"
  38 #include "wimlib/xml.h"
  39
  40 #include <errno.h>
  41 #include <sys/stat.h>
  42 #include <stdlib.h>
  43
  44 #ifdef HAVE_ALLOCA_H
  45 #  include <alloca.h>
  46 #endif
  47
  48 /* Saved specification of a "primitive" update operation that was performed.  */
  49 struct update_primitive {
  50         enum {
  51                 /* Unlinked a dentry from its parent directory.  */
  52                 UNLINK_DENTRY,
  53
  54                 /* Linked a dentry into its parent directory.  */
  55                 LINK_DENTRY,
  56
  57                 /* Changed the file name of a dentry.  */
  58                 CHANGE_FILE_NAME,
  59
  60                 /* Changed the short name of a dentry.  */
  61                 CHANGE_SHORT_NAME,
  62         } type;
  63
  64         union {
  65                 /* For UNLINK_DENTRY and LINK_DENTRY operations  */
  66                 struct {
  67                         /* Dentry that was linked or unlinked.  */
  68                         struct wim_dentry *subject;
  69
  70                         /* For link operations, the directory into which
  71                          * @subject was linked, or NULL if @subject was set as
  72                          * the root of the image.
  73                          *
  74                          * For unlink operations, the directory from which
  75                          * @subject was unlinked, or NULL if @subject was unset
  76                          * as the root of the image.  */
  77                         struct wim_dentry *parent;
  78                 } link;
  79
  80                 /* For CHANGE_FILE_NAME and CHANGE_SHORT_NAME operations  */
  81                 struct {
  82                         /* Dentry that had its name changed.  */
  83                         struct wim_dentry *subject;
  84
  85                         /* The old name.  */
  86                         utf16lechar *old_name;
  87                 } name;
  88         };
  89 };
  90
  91 /* Chronological list of primitive operations that were executed for a single
  92  * logical update command, such as 'add', 'delete', or 'rename'.  */
  93 struct update_primitive_list {
  94         struct update_primitive *entries;
  95         struct update_primitive inline_entries[4];
  96         size_t num_entries;
  97         size_t num_alloc_entries;
  98 };
  99
 100 /* Journal for managing the executing of zero or more logical update commands,
 101  * such as 'add', 'delete', or 'rename'.  This allows either committing or
 102  * rolling back the commands.  */
 103 struct update_command_journal {
 104         /* Number of update commands this journal contains.  */
 105         size_t num_cmds;
 106
 107         /* Index of currently executing update command.  */
 108         size_t cur_cmd;
 109
 110         /* Location of the WIM image's root pointer.  */
 111         struct wim_dentry **root_p;
 112
 113         /* Pointer to the lookup table of the WIM (may needed for rollback)  */
 114         struct wim_lookup_table *lookup_table;
 115
 116         /* List of dentries that are currently unlinked from the WIM image.
 117          * These must be freed when no longer needed for commit or rollback.  */
 118         struct list_head orphans;
 119
 120         /* Per-command logs.  */
 121         struct update_primitive_list cmd_prims[];
 122 };
 123
 124 static void
 125 init_update_primitive_list(struct update_primitive_list *l)
 126 {
 127         l->entries = l->inline_entries;
 128         l->num_entries = 0;
 129         l->num_alloc_entries = ARRAY_LEN(l->inline_entries);
 130 }
 131
 132 /* Allocates a new journal for managing the execution of up to @num_cmds update
 133  * commands.  */
 134 static struct update_command_journal *
 135 new_update_command_journal(size_t num_cmds, struct wim_dentry **root_p,
 136                            struct wim_lookup_table *lookup_table)
 137 {
 138         struct update_command_journal *j;
 139
 140         j = MALLOC(sizeof(*j) + num_cmds * sizeof(j->cmd_prims[0]));
 141         if (j) {
 142                 j->num_cmds = num_cmds;
 143                 j->cur_cmd = 0;
 144                 j->root_p = root_p;
 145                 j->lookup_table = lookup_table;
 146                 INIT_LIST_HEAD(&j->orphans);
 147                 for (size_t i = 0; i < num_cmds; i++)
 148                         init_update_primitive_list(&j->cmd_prims[i]);
 149         }
 150         return j;
 151 }
 152
 153 /* Don't call this directly; use commit_update() or rollback_update() instead.
 154  */
 155 static void
 156 free_update_command_journal(struct update_command_journal *j)
 157 {
 158         struct wim_dentry *orphan;
 159
 160         /* Free orphaned dentry trees  */
 161         while (!list_empty(&j->orphans)) {
 162                 orphan = list_first_entry(&j->orphans,
 163                                           struct wim_dentry, tmp_list);
 164                 list_del(&orphan->tmp_list);
 165                 free_dentry_tree(orphan, j->lookup_table);
 166         }
 167
 168         for (size_t i = 0; i < j->num_cmds; i++)
 169                 if (j->cmd_prims[i].entries != j->cmd_prims[i].inline_entries)
 170                         FREE(j->cmd_prims[i].entries);
 171         FREE(j);
 172 }
 173
 174 /* Add the entry @prim to the update command journal @j.  */
 175 static int
 176 record_update_primitive(struct update_command_journal *j,
 177                         struct update_primitive prim)
 178 {
 179         struct update_primitive_list *l;
 180
 181         l = &j->cmd_prims[j->cur_cmd];
 182
 183         if (l->num_entries == l->num_alloc_entries) {
 184                 struct update_primitive *new_entries;
 185                 size_t new_num_alloc_entries;
 186                 size_t new_size;
 187
 188                 new_num_alloc_entries = l->num_alloc_entries * 2;
 189                 new_size = new_num_alloc_entries * sizeof(new_entries[0]);
 190                 if (l->entries == l->inline_entries) {
 191                         new_entries = MALLOC(new_size);
 192                         if (!new_entries)
 193                                 return WIMLIB_ERR_NOMEM;
 194                         memcpy(new_entries, l->inline_entries,
 195                                sizeof(l->inline_entries));
 196                 } else {
 197                         new_entries = REALLOC(l->entries, new_size);
 198                         if (!new_entries)
 199                                 return WIMLIB_ERR_NOMEM;
 200                 }
 201                 l->entries = new_entries;
 202                 l->num_alloc_entries = new_num_alloc_entries;
 203         }
 204         l->entries[l->num_entries++] = prim;
 205         return 0;
 206 }
 207
 208 static void
 209 do_unlink(struct wim_dentry *subject, struct wim_dentry *parent,
 210           struct wim_dentry **root_p)
 211 {
 212         if (parent) {
 213                 /* Unlink @subject from its @parent.  */
 214                 wimlib_assert(subject->parent == parent);
 215                 unlink_dentry(subject);
 216         } else {
 217                 /* Unset @subject as the root of the image.  */
 218                 *root_p = NULL;
 219         }
 220         subject->parent = subject;
 221 }
 222
 223 static void
 224 do_link(struct wim_dentry *subject, struct wim_dentry *parent,
 225         struct wim_dentry **root_p)
 226 {
 227         if (parent) {
 228                 /* Link @subject to its @parent  */
 229                 struct wim_dentry *existing;
 230
 231                 existing = dentry_add_child(parent, subject);
 232                 wimlib_assert(!existing);
 233         } else {
 234                 /* Set @subject as root of the image  */
 235                 *root_p = subject;
 236         }
 237 }
 238
 239 /* Undo a link operation.  */
 240 static void
 241 rollback_link(struct wim_dentry *subject, struct wim_dentry *parent,
 242               struct wim_dentry **root_p, struct list_head *orphans)
 243 {
 244         /* Unlink is the opposite of link  */
 245         do_unlink(subject, parent, root_p);
 246
 247         /* @subject is now unlinked.  Add it to orphans. */
 248         list_add(&subject->tmp_list, orphans);
 249         subject->is_orphan = 1;
 250 }
 251
 252 /* Undo an unlink operation.  */
 253 static void
 254 rollback_unlink(struct wim_dentry *subject, struct wim_dentry *parent,
 255                 struct wim_dentry **root_p)
 256 {
 257         /* Link is the opposite of unlink  */
 258         do_link(subject, parent, root_p);
 259
 260         /* @subject is no longer unlinked.  Delete it from orphans. */
 261         list_del(&subject->tmp_list);
 262         subject->is_orphan = 0;
 263 }
 264
 265 /* Rollback a name change operation.  */
 266 static void
 267 rollback_name_change(utf16lechar *old_name,
 268                      utf16lechar **name_ptr, u16 *name_nbytes_ptr)
 269 {
 270         /* Free the new name, then replace it with the old name.  */
 271         FREE(*name_ptr);
 272         if (old_name) {
 273                 *name_ptr = old_name;
 274                 *name_nbytes_ptr = utf16le_strlen(old_name);
 275         } else {
 276                 *name_ptr = NULL;
 277                 *name_nbytes_ptr = 0;
 278         }
 279 }
 280
 281 /* Rollback a primitive update operation.  */
 282 static void
 283 rollback_update_primitive(const struct update_primitive *prim,
 284                           struct wim_dentry **root_p,
 285                           struct list_head *orphans)
 286 {
 287         switch (prim->type) {
 288         case LINK_DENTRY:
 289                 rollback_link(prim->link.subject, prim->link.parent, root_p,
 290                               orphans);
 291                 break;
 292         case UNLINK_DENTRY:
 293                 rollback_unlink(prim->link.subject, prim->link.parent, root_p);
 294                 break;
 295         case CHANGE_FILE_NAME:
 296                 rollback_name_change(prim->name.old_name,
 297                                      &prim->name.subject->file_name,
 298                                      &prim->name.subject->file_name_nbytes);
 299                 break;
 300         case CHANGE_SHORT_NAME:
 301                 rollback_name_change(prim->name.old_name,
 302                                      &prim->name.subject->short_name,
 303                                      &prim->name.subject->short_name_nbytes);
 304                 break;
 305         }
 306 }
 307
 308 /* Rollback a logical update command  */
 309 static void
 310 rollback_update_command(const struct update_primitive_list *l,
 311                         struct wim_dentry **root_p,
 312                         struct list_head *orphans)
 313 {
 314         size_t i = l->num_entries;
 315
 316         /* Rollback each primitive operation, in reverse order.  */
 317         while (i--)
 318                 rollback_update_primitive(&l->entries[i], root_p, orphans);
 319 }
 320
 321 /****************************************************************************/
 322
 323 /* Link @subject into the directory @parent; or, if @parent is NULL, set
 324  * @subject as the root of the WIM image.
 325  *
 326  * This is the journaled version, so it can be rolled back.  */
 327 static int
 328 journaled_link(struct update_command_journal *j,
 329                struct wim_dentry *subject, struct wim_dentry *parent)
 330 {
 331         struct update_primitive prim;
 332         int ret;
 333
 334         prim.type = LINK_DENTRY;
 335         prim.link.subject = subject;
 336         prim.link.parent = parent;
 337
 338         ret = record_update_primitive(j, prim);
 339         if (ret)
 340                 return ret;
 341
 342         do_link(subject, parent, j->root_p);
 343
 344         if (subject->is_orphan) {
 345                 list_del(&subject->tmp_list);
 346                 subject->is_orphan = 0;
 347         }
 348         return 0;
 349 }
 350
 351 /* Unlink @subject from the WIM image.
 352  *
 353  * This is the journaled version, so it can be rolled back.  */
 354 static int
 355 journaled_unlink(struct update_command_journal *j, struct wim_dentry *subject)
 356 {
 357         struct wim_dentry *parent;
 358         struct update_primitive prim;
 359         int ret;
 360
 361         if (dentry_is_root(subject))
 362                 parent = NULL;
 363         else
 364                 parent = subject->parent;
 365
 366         prim.type = UNLINK_DENTRY;
 367         prim.link.subject = subject;
 368         prim.link.parent = parent;
 369
 370         ret = record_update_primitive(j, prim);
 371         if (ret)
 372                 return ret;
 373
 374         do_unlink(subject, parent, j->root_p);
 375
 376         list_add(&subject->tmp_list, &j->orphans);
 377         subject->is_orphan = 1;
 378         return 0;
 379 }
 380
 381 /* Change the name of @dentry to @new_name_tstr.
 382  *
 383  * This is the journaled version, so it can be rolled back.  */
 384 static int
 385 journaled_change_name(struct update_command_journal *j,
 386                       struct wim_dentry *dentry, const tchar *new_name_tstr)
 387 {
 388         int ret;
 389         utf16lechar *new_name = NULL;
 390         u16 new_name_nbytes = 0;
 391         struct update_primitive prim;
 392
 393         /* Set the long name.  */
 394         ret = get_utf16le_string(new_name_tstr, &new_name, &new_name_nbytes);
 395         if (ret)
 396                 return ret;
 397
 398         prim.type = CHANGE_FILE_NAME;
 399         prim.name.subject = dentry;
 400         prim.name.old_name = dentry->file_name;
 401         ret = record_update_primitive(j, prim);
 402         if (ret)
 403                 return ret;
 404
 405         dentry->file_name = new_name;
 406         dentry->file_name_nbytes = new_name_nbytes;
 407
 408         /* Clear the short name.  */
 409         prim.type = CHANGE_SHORT_NAME;
 410         prim.name.subject = dentry;
 411         prim.name.old_name = dentry->short_name;
 412         ret = record_update_primitive(j, prim);
 413         if (ret)
 414                 return ret;
 415
 416         dentry->short_name = NULL;
 417         dentry->short_name_nbytes = 0;
 418         return 0;
 419 }
 420
 421 static void
 422 next_command(struct update_command_journal *j)
 423 {
 424         j->cur_cmd++;
 425 }
 426
 427 static void
 428 commit_update(struct update_command_journal *j)
 429 {
 430         for (size_t i = 0; i < j->num_cmds; i++)
 431         {
 432                 for (size_t k = 0; k < j->cmd_prims[i].num_entries; k++)
 433                 {
 434                         if (j->cmd_prims[i].entries[k].type == CHANGE_FILE_NAME ||
 435                             j->cmd_prims[i].entries[k].type == CHANGE_SHORT_NAME)
 436                         {
 437                                 FREE(j->cmd_prims[i].entries[k].name.old_name);
 438                         }
 439                 }
 440         }
 441         free_update_command_journal(j);
 442 }
 443
 444 static void
 445 rollback_update(struct update_command_journal *j)
 446 {
 447         /* Rollback each logical update command, in reverse order.  */
 448         size_t i = j->cur_cmd;
 449         if (i < j->num_cmds)
 450                 i++;
 451         while (i--)
 452                 rollback_update_command(&j->cmd_prims[i], j->root_p, &j->orphans);
 453         free_update_command_journal(j);
 454 }
 455
 456 /*
 457  * Set the name of @branch for placing it at @target in the WIM image.  This
 458  * assumes that @target is in "canonical form", as produced by
 459  * canonicalize_wim_path().
 460  *
 461  * Note: for the root target this produces the empty name.
 462  */
 463 static int
 464 set_branch_name(struct wim_dentry *branch, const utf16lechar *target)
 465 {
 466         const utf16lechar *p;
 467
 468         /* Find end of string.  (We can assume it contains at least one
 469          * character, the leading slash.)   */
 470         wimlib_assert(target[0] == cpu_to_le16(WIM_PATH_SEPARATOR));
 471         p = target;
 472         do {
 473                 p++;
 474         } while (*p);
 475
 476         while (*(p - 1) != cpu_to_le16(WIM_PATH_SEPARATOR))
 477                 p--;
 478
 479
 480         /* We're assuming no trailing slashes.  */
 481         wimlib_assert(*p || p == &target[1]);
 482
 483         return dentry_set_name_utf16le(branch, p);
 484 }
 485
 486 static int
 487 handle_conflict(struct wim_dentry *branch, struct wim_dentry *existing,
 488                 struct update_command_journal *j,
 489                 int add_flags, wimlib_progress_func_t progress_func)
 490 {
 491         bool branch_is_dir = dentry_is_directory(branch);
 492         bool existing_is_dir = dentry_is_directory(existing);
 493
 494         if (branch_is_dir != existing_is_dir) {
 495                 if (existing_is_dir)  {
 496                         ERROR("\"%"TS"\" is a directory!\n"
 497                               "        Specify the path at which "
 498                               "to place the file inside this directory.",
 499                               dentry_full_path(existing));
 500                         return WIMLIB_ERR_IS_DIRECTORY;
 501                 } else {
 502                         ERROR("Can't place directory at \"%"TS"\" because "
 503                               "a nondirectory file already exists there!",
 504                               dentry_full_path(existing));
 505                         return WIMLIB_ERR_NOTDIR;
 506                 }
 507         }
 508
 509         if (branch_is_dir) {
 510                 /* Directory overlay  */
 511                 while (dentry_has_children(branch)) {
 512                         struct wim_dentry *new_child;
 513                         struct wim_dentry *existing_child;
 514                         int ret;
 515
 516                         new_child = dentry_any_child(branch);
 517
 518                         existing_child =
 519                                 get_dentry_child_with_utf16le_name(existing,
 520                                                                    new_child->file_name,
 521                                                                    new_child->file_name_nbytes,
 522                                                                    WIMLIB_CASE_PLATFORM_DEFAULT);
 523                         unlink_dentry(new_child);
 524                         if (existing_child) {
 525                                 ret = handle_conflict(new_child, existing_child,
 526                                                       j, add_flags, progress_func);
 527                         } else {
 528                                 ret = journaled_link(j, new_child, existing);
 529                         }
 530                         if (ret) {
 531                                 dentry_add_child(branch, new_child);
 532                                 return ret;
 533                         }
 534                 }
 535                 free_dentry(branch);
 536                 return 0;
 537         } else if (add_flags & WIMLIB_ADD_FLAG_NO_REPLACE) {
 538                 /* Can't replace nondirectory file  */
 539                 ERROR("Refusing to overwrite nondirectory file \"%"TS"\"",
 540                       dentry_full_path(existing));
 541                 return WIMLIB_ERR_INVALID_OVERLAY;
 542         } else {
 543                 /* Replace nondirectory file  */
 544                 struct wim_dentry *parent;
 545                 int ret;
 546
 547                 parent = existing->parent;
 548
 549                 ret = calculate_dentry_full_path(existing);
 550                 if (ret)
 551                         return ret;
 552
 553                 ret = journaled_unlink(j, existing);
 554                 if (ret)
 555                         return ret;
 556
 557                 ret = journaled_link(j, branch, parent);
 558                 if (ret)
 559                         return ret;
 560
 561                 if (progress_func && (add_flags & WIMLIB_ADD_FLAG_VERBOSE)) {
 562                         union wimlib_progress_info info;
 563
 564                         info.replace.path_in_wim = existing->_full_path;
 565                         progress_func(WIMLIB_PROGRESS_MSG_REPLACE_FILE_IN_WIM, &info);
 566                 }
 567                 return 0;
 568         }
 569 }
 570
 571 static int
 572 do_attach_branch(struct wim_dentry *branch, utf16lechar *target,
 573                  struct update_command_journal *j,
 574                  int add_flags, wimlib_progress_func_t progress_func)
 575 {
 576         struct wim_dentry *parent;
 577         struct wim_dentry *existing;
 578         utf16lechar empty_name[1] = {0};
 579         utf16lechar *cur_component_name;
 580         utf16lechar *next_component_name;
 581         int ret;
 582
 583         /* Attempt to create root directory before proceeding to the "real"
 584          * first component  */
 585         parent = NULL;
 586         existing = *j->root_p;
 587         cur_component_name = empty_name;
 588
 589         /* Skip leading slashes  */
 590         next_component_name = target;
 591         while (*next_component_name == cpu_to_le16(WIM_PATH_SEPARATOR))
 592                 next_component_name++;
 593
 594         while (*next_component_name) { /* While not the last component ... */
 595                 utf16lechar *end;
 596
 597                 if (existing) {
 598                         /* Descend into existing directory  */
 599                         if (!dentry_is_directory(existing)) {
 600                                 ERROR("\"%"TS"\" in the WIM image "
 601                                       "is not a directory!",
 602                                       dentry_full_path(existing));
 603                                 return WIMLIB_ERR_NOTDIR;
 604                         }
 605                 } else {
 606                         /* A parent directory of the target didn't exist.  Make
 607                          * the way by creating a filler directory.  */
 608                         struct wim_dentry *filler;
 609
 610                         ret = new_filler_directory(T(""), &filler);
 611                         if (ret)
 612                                 return ret;
 613                         ret = dentry_set_name_utf16le(filler,
 614                                                       cur_component_name);
 615                         if (ret) {
 616                                 free_dentry(filler);
 617                                 return ret;
 618                         }
 619                         ret = journaled_link(j, filler, parent);
 620                         if (ret) {
 621                                 free_dentry(filler);
 622                                 return ret;
 623                         }
 624                         existing = filler;
 625                 }
 626
 627                 /* Advance to next component  */
 628
 629                 cur_component_name = next_component_name;
 630                 end = cur_component_name + 1;
 631                 while (*end && *end != cpu_to_le16(WIM_PATH_SEPARATOR))
 632                         end++;
 633
 634                 next_component_name = end;
 635                 if (*end) {
 636                         /* There will still be more components after this.  */
 637                         *end = 0;
 638                         do {
 639                         } while (*++next_component_name == cpu_to_le16(WIM_PATH_SEPARATOR));
 640                         wimlib_assert(*next_component_name);  /* No trailing slashes  */
 641                 } else {
 642                         /* This will be the last component  */
 643                         next_component_name = end;
 644                 }
 645                 parent = existing;
 646                 existing = get_dentry_child_with_utf16le_name(
 647                                         parent,
 648                                         cur_component_name,
 649                                         (end - cur_component_name) * sizeof(utf16lechar),
 650                                         WIMLIB_CASE_PLATFORM_DEFAULT);
 651         }
 652
 653         /* Last component  */
 654         if (existing) {
 655                 return handle_conflict(branch, existing, j,
 656                                        add_flags, progress_func);
 657         } else {
 658                 return journaled_link(j, branch, parent);
 659         }
 660 }
 661
 662 /*
 663  * Place the directory entry tree @branch at the path @target_tstr in the WIM
 664  * image.
 665  *
 666  * @target_tstr cannot contain trailing slashes, and all path separators must be
 667  * WIM_PATH_SEPARATOR.
 668  *
 669  * On success, @branch is committed to the journal @j.
 670  * Otherwise @branch is freed.
 671  *
 672  * The relevant @add_flags are WIMLIB_ADD_FLAG_NO_REPLACE and
 673  * WIMLIB_ADD_FLAG_VERBOSE.
 674  */
 675 static int
 676 attach_branch(struct wim_dentry *branch, const tchar *target_tstr,
 677               struct update_command_journal *j,
 678               int add_flags, wimlib_progress_func_t progress_func)
 679 {
 680         int ret;
 681         utf16lechar *target;
 682
 683         if (unlikely(!branch))
 684                 return 0;
 685
 686 #if TCHAR_IS_UTF16LE
 687         target = memdup(target_tstr,
 688                         (tstrlen(target_tstr) + 1) * sizeof(target_tstr[0]));
 689         if (!target) {
 690                 ret = WIMLIB_ERR_NOMEM;
 691                 goto out_free_branch;
 692         }
 693 #else
 694         {
 695                 size_t target_nbytes;
 696                 ret = tstr_to_utf16le(target_tstr,
 697                                       tstrlen(target_tstr) * sizeof(target_tstr[0]),
 698                                       &target, &target_nbytes);
 699                 if (ret)
 700                         goto out_free_branch;
 701         }
 702 #endif
 703
 704         ret = set_branch_name(branch, target);
 705         if (ret)
 706                 goto out_free_target;
 707
 708         ret = do_attach_branch(branch, target, j, add_flags, progress_func);
 709         if (ret)
 710                 goto out_free_target;
 711         /* branch was successfully committed to the journal  */
 712         branch = NULL;
 713 out_free_target:
 714         FREE(target);
 715 out_free_branch:
 716         free_dentry_tree(branch, j->lookup_table);
 717         return ret;
 718 }
 719
 720 static const char wincfg[] =
 721 "[ExclusionList]\n"
 722 "/$ntfs.log\n"
 723 "/hiberfil.sys\n"
 724 "/pagefile.sys\n"
 725 "/swapfile.sys\n"
 726 "/System Volume Information\n"
 727 "/RECYCLER\n"
 728 "/Windows/CSC\n";
 729
 730 static const tchar *wimboot_cfgfile =
 731             WIMLIB_WIM_PATH_SEPARATOR_STRING T("Windows")
 732             WIMLIB_WIM_PATH_SEPARATOR_STRING T("System32")
 733             WIMLIB_WIM_PATH_SEPARATOR_STRING T("WimBootCompress.ini");
 734
 735 static int
 736 get_capture_config(const tchar *config_file, struct capture_config *config,
 737                    int add_flags, const tchar *fs_source_path)
 738 {
 739         int ret;
 740         tchar *tmp_config_file = NULL;
 741
 742         memset(config, 0, sizeof(*config));
 743
 744         /* For WIMBoot capture, check for default capture configuration file
 745          * unless one was explicitly specified.  */
 746         if (!config_file && (add_flags & WIMLIB_ADD_FLAG_WIMBOOT)) {
 747
 748                 /* XXX: Handle loading file correctly when in NTFS volume.  */
 749
 750                 size_t len = tstrlen(fs_source_path) +
 751                              tstrlen(wimboot_cfgfile);
 752                 tmp_config_file = MALLOC((len + 1) * sizeof(tchar));
 753                 struct stat st;
 754
 755                 tsprintf(tmp_config_file, T("%"TS"%"TS),
 756                          fs_source_path, wimboot_cfgfile);
 757                 if (!tstat(tmp_config_file, &st)) {
 758                         config_file = tmp_config_file;
 759                         add_flags &= ~WIMLIB_ADD_FLAG_WINCONFIG;
 760                 } else {
 761                         WARNING("\"%"TS"\" does not exist.\n"
 762                                 "          Using default capture configuration!",
 763                                 tmp_config_file);
 764                 }
 765         }
 766
 767         if (add_flags & WIMLIB_ADD_FLAG_WINCONFIG) {
 768                 /* Use Windows default.  */
 769                 if (config_file)
 770                         return WIMLIB_ERR_INVALID_PARAM;
 771                 ret = do_read_capture_config_file(T("wincfg"), wincfg,
 772                                                   sizeof(wincfg) - 1, config);
 773         } else if (config_file) {
 774                 /* Use the specified configuration file.  */
 775                 ret = do_read_capture_config_file(config_file, NULL, 0, config);
 776         } else {
 777                 /* ... Or don't use any configuration file at all.  No files
 778                  * will be excluded from capture, all files will be compressed,
 779                  * etc.  */
 780                 ret = 0;
 781         }
 782         FREE(tmp_config_file);
 783         return ret;
 784 }
 785
 786 static int
 787 execute_add_command(struct update_command_journal *j,
 788                     WIMStruct *wim,
 789                     const struct wimlib_update_command *add_cmd,
 790                     struct wim_inode_table *inode_table,
 791                     struct wim_sd_set *sd_set,
 792                     struct list_head *unhashed_streams,
 793                     wimlib_progress_func_t progress_func)
 794 {
 795         int ret;
 796         int add_flags;
 797         tchar *fs_source_path;
 798         tchar *wim_target_path;
 799         const tchar *config_file;
 800         struct add_image_params params;
 801         struct capture_config config;
 802         capture_tree_t capture_tree = platform_default_capture_tree;
 803 #ifdef WITH_NTFS_3G
 804         struct _ntfs_volume *ntfs_vol = NULL;
 805 #endif
 806         void *extra_arg = NULL;
 807         struct wim_dentry *branch;
 808
 809         add_flags = add_cmd->add.add_flags;
 810         fs_source_path = add_cmd->add.fs_source_path;
 811         wim_target_path = add_cmd->add.wim_target_path;
 812         config_file = add_cmd->add.config_file;
 813
 814         DEBUG("fs_source_path=\"%"TS"\", wim_target_path=\"%"TS"\", add_flags=%#x",
 815               fs_source_path, wim_target_path, add_flags);
 816
 817         memset(&params, 0, sizeof(params));
 818
 819 #ifdef WITH_NTFS_3G
 820         if (add_flags & WIMLIB_ADD_FLAG_NTFS) {
 821                 capture_tree = build_dentry_tree_ntfs;
 822                 extra_arg = &ntfs_vol;
 823                 if (wim_get_current_image_metadata(wim)->ntfs_vol != NULL) {
 824                         ERROR("NTFS volume already set");
 825                         ret = WIMLIB_ERR_INVALID_PARAM;
 826                         goto out;
 827                 }
 828         }
 829 #endif
 830
 831         ret = get_capture_config(config_file, &config,
 832                                  add_flags, fs_source_path);
 833         if (ret)
 834                 goto out;
 835
 836         params.lookup_table = wim->lookup_table;
 837         params.unhashed_streams = unhashed_streams;
 838         params.inode_table = inode_table;
 839         params.sd_set = sd_set;
 840         params.config = &config;
 841         params.add_flags = add_flags;
 842         params.extra_arg = extra_arg;
 843
 844         params.progress_func = progress_func;
 845         params.progress.scan.source = fs_source_path;
 846         params.progress.scan.wim_target_path = wim_target_path;
 847         if (progress_func)
 848                 progress_func(WIMLIB_PROGRESS_MSG_SCAN_BEGIN, &params.progress);
 849
 850         if (WIMLIB_IS_WIM_ROOT_PATH(wim_target_path))
 851                 params.add_flags |= WIMLIB_ADD_FLAG_ROOT;
 852         ret = (*capture_tree)(&branch, fs_source_path, &params);
 853         if (ret)
 854                 goto out_destroy_config;
 855
 856         if (progress_func)
 857                 progress_func(WIMLIB_PROGRESS_MSG_SCAN_END, &params.progress);
 858
 859         if (WIMLIB_IS_WIM_ROOT_PATH(wim_target_path) &&
 860             branch && !dentry_is_directory(branch))
 861         {
 862                 ERROR("\"%"TS"\" is not a directory!", fs_source_path);
 863                 ret = WIMLIB_ERR_NOTDIR;
 864                 free_dentry_tree(branch, wim->lookup_table);
 865                 goto out_cleanup_after_capture;
 866         }
 867
 868         ret = attach_branch(branch, wim_target_path, j,
 869                             add_flags, params.progress_func);
 870         if (ret)
 871                 goto out_cleanup_after_capture;
 872
 873         if (config_file && (add_flags & WIMLIB_ADD_FLAG_WIMBOOT) &&
 874             WIMLIB_IS_WIM_ROOT_PATH(wim_target_path))
 875         {
 876                 params.add_flags = 0;
 877                 params.progress_func = NULL;
 878                 params.config = NULL;
 879
 880                 /* If a capture configuration file was explicitly specified when
 881                  * capturing an image in WIMBoot mode, save it as
 882                  * /Windows/System32/WimBootCompress.ini in the WIM image. */
 883                 ret = platform_default_capture_tree(&branch, config_file, &params);
 884                 if (ret)
 885                         goto out_cleanup_after_capture;
 886
 887                 ret = attach_branch(branch, wimboot_cfgfile, j, 0, NULL);
 888                 if (ret)
 889                         goto out_cleanup_after_capture;
 890         }
 891
 892 #ifdef WITH_NTFS_3G
 893         wim_get_current_image_metadata(wim)->ntfs_vol = ntfs_vol;
 894 #endif
 895         if (add_flags & WIMLIB_ADD_FLAG_RPFIX)
 896                 wim->hdr.flags |= WIM_HDR_FLAG_RP_FIX;
 897         ret = 0;
 898         goto out_destroy_config;
 899 out_cleanup_after_capture:
 900 #ifdef WITH_NTFS_3G
 901         if (ntfs_vol)
 902                 do_ntfs_umount(ntfs_vol);
 903 #endif
 904 out_destroy_config:
 905         destroy_capture_config(&config);
 906 out:
 907         return ret;
 908 }
 909
 910 static int
 911 execute_delete_command(struct update_command_journal *j,
 912                        WIMStruct *wim,
 913                        const struct wimlib_update_command *delete_cmd)
 914 {
 915         int flags;
 916         const tchar *wim_path;
 917         struct wim_dentry *tree;
 918
 919         flags = delete_cmd->delete_.delete_flags;
 920         wim_path = delete_cmd->delete_.wim_path;
 921
 922         DEBUG("Deleting WIM path \"%"TS"\" (flags=%#x)", wim_path, flags);
 923
 924         tree = get_dentry(wim, wim_path, WIMLIB_CASE_PLATFORM_DEFAULT);
 925         if (!tree) {
 926                 /* Path to delete does not exist in the WIM. */
 927                 if (flags & WIMLIB_DELETE_FLAG_FORCE) {
 928                         return 0;
 929                 } else {
 930                         ERROR("Path \"%"TS"\" does not exist in WIM image %d",
 931                               wim_path, wim->current_image);
 932                         return WIMLIB_ERR_PATH_DOES_NOT_EXIST;
 933                 }
 934         }
 935
 936         if (dentry_is_directory(tree) && !(flags & WIMLIB_DELETE_FLAG_RECURSIVE)) {
 937                 ERROR("Path \"%"TS"\" in WIM image %d is a directory "
 938                       "but a recursive delete was not requested",
 939                       wim_path, wim->current_image);
 940                 return WIMLIB_ERR_IS_DIRECTORY;
 941         }
 942
 943         return journaled_unlink(j, tree);
 944 }
 945
 946 static int
 947 free_dentry_full_path(struct wim_dentry *dentry, void *_ignore)
 948 {
 949         FREE(dentry->_full_path);
 950         dentry->_full_path = NULL;
 951         return 0;
 952 }
 953
 954 /* Is @d1 a (possibly nonproper) ancestor of @d2?  */
 955 static bool
 956 is_ancestor(struct wim_dentry *d1, struct wim_dentry *d2)
 957 {
 958         for (;;) {
 959                 if (d2 == d1)
 960                         return true;
 961                 if (dentry_is_root(d2))
 962                         return false;
 963                 d2 = d2->parent;
 964         }
 965 }
 966
 967 /* Rename a file or directory in the WIM.
 968  *
 969  * This returns a -errno value.
 970  *
 971  * The journal @j is optional.
 972  */
 973 int
 974 rename_wim_path(WIMStruct *wim, const tchar *from, const tchar *to,
 975                 CASE_SENSITIVITY_TYPE case_type,
 976                 struct update_command_journal *j)
 977 {
 978         struct wim_dentry *src;
 979         struct wim_dentry *dst;
 980         struct wim_dentry *parent_of_dst;
 981         int ret;
 982
 983         /* This rename() implementation currently only supports actual files
 984          * (not alternate data streams) */
 985
 986         src = get_dentry(wim, from, case_type);
 987         if (!src)
 988                 return -errno;
 989
 990         dst = get_dentry(wim, to, case_type);
 991
 992         if (dst) {
 993                 /* Destination file exists */
 994
 995                 if (src == dst) /* Same file */
 996                         return 0;
 997
 998                 if (!dentry_is_directory(src)) {
 999                         /* Cannot rename non-directory to directory. */
1000                         if (dentry_is_directory(dst))
1001                                 return -EISDIR;
1002                 } else {
1003                         /* Cannot rename directory to a non-directory or a non-empty
1004                          * directory */
1005                         if (!dentry_is_directory(dst))
1006                                 return -ENOTDIR;
1007                         if (dentry_has_children(dst))
1008                                 return -ENOTEMPTY;
1009                 }
1010                 parent_of_dst = dst->parent;
1011         } else {
1012                 /* Destination does not exist */
1013                 parent_of_dst = get_parent_dentry(wim, to, case_type);
1014                 if (!parent_of_dst)
1015                         return -errno;
1016
1017                 if (!dentry_is_directory(parent_of_dst))
1018                         return -ENOTDIR;
1019         }
1020
1021         /* @src can't be an ancestor of @dst.  Otherwise we're unlinking @src
1022          * from the tree and creating a loop...  */
1023         if (is_ancestor(src, parent_of_dst))
1024                 return -EBUSY;
1025
1026         if (j) {
1027                 if (dst)
1028                         if (journaled_unlink(j, dst))
1029                                 return -ENOMEM;
1030                 if (journaled_unlink(j, src))
1031                         return -ENOMEM;
1032                 if (journaled_change_name(j, src, path_basename(to)))
1033                         return -ENOMEM;
1034                 if (journaled_link(j, src, parent_of_dst))
1035                         return -ENOMEM;
1036         } else {
1037                 ret = dentry_set_name(src, path_basename(to));
1038                 if (ret)
1039                         return -ENOMEM;
1040                 if (dst) {
1041                         unlink_dentry(dst);
1042                         free_dentry_tree(dst, wim->lookup_table);
1043                 }
1044                 unlink_dentry(src);
1045                 dentry_add_child(parent_of_dst, src);
1046         }
1047         if (src->_full_path)
1048                 for_dentry_in_tree(src, free_dentry_full_path, NULL);
1049         return 0;
1050 }
1051
1052
1053 static int
1054 execute_rename_command(struct update_command_journal *j,
1055                        WIMStruct *wim,
1056                        const struct wimlib_update_command *rename_cmd)
1057 {
1058         int ret;
1059
1060         ret = rename_wim_path(wim, rename_cmd->rename.wim_source_path,
1061                               rename_cmd->rename.wim_target_path,
1062                               WIMLIB_CASE_PLATFORM_DEFAULT, j);
1063         if (ret) {
1064                 ret = -ret;
1065                 errno = ret;
1066                 ERROR_WITH_ERRNO("Can't rename \"%"TS"\" to \"%"TS"\"",
1067                                  rename_cmd->rename.wim_source_path,
1068                                  rename_cmd->rename.wim_target_path);
1069                 switch (ret) {
1070                 case ENOMEM:
1071                         ret = WIMLIB_ERR_NOMEM;
1072                         break;
1073                 case ENOTDIR:
1074                         ret = WIMLIB_ERR_NOTDIR;
1075                         break;
1076                 case ENOTEMPTY:
1077                 case EBUSY:
1078                         /* XXX: EBUSY is returned when the rename would create a
1079                          * loop.  It maybe should have its own error code.  */
1080                         ret = WIMLIB_ERR_NOTEMPTY;
1081                         break;
1082                 case EISDIR:
1083                         ret = WIMLIB_ERR_IS_DIRECTORY;
1084                         break;
1085                 case ENOENT:
1086                 default:
1087                         ret = WIMLIB_ERR_PATH_DOES_NOT_EXIST;
1088                         break;
1089                 }
1090         }
1091         return ret;
1092 }
1093
1094 static inline const tchar *
1095 update_op_to_str(int op)
1096 {
1097         switch (op) {
1098         case WIMLIB_UPDATE_OP_ADD:
1099                 return T("add");
1100         case WIMLIB_UPDATE_OP_DELETE:
1101                 return T("delete");
1102         case WIMLIB_UPDATE_OP_RENAME:
1103                 return T("rename");
1104         default:
1105                 wimlib_assert(0);
1106                 return NULL;
1107         }
1108 }
1109
1110 static bool
1111 have_command_type(const struct wimlib_update_command *cmds, size_t num_cmds,
1112                   enum wimlib_update_op op)
1113 {
1114         for (size_t i = 0; i < num_cmds; i++)
1115                 if (cmds[i].op == op)
1116                         return true;
1117         return false;
1118 }
1119
1120 static int
1121 execute_update_commands(WIMStruct *wim,
1122                         const struct wimlib_update_command *cmds,
1123                         size_t num_cmds,
1124                         int update_flags,
1125                         wimlib_progress_func_t progress_func)
1126 {
1127         struct wim_inode_table *inode_table;
1128         struct wim_sd_set *sd_set;
1129         struct list_head unhashed_streams;
1130         struct update_command_journal *j;
1131         union wimlib_progress_info info;
1132         int ret;
1133
1134         if (have_command_type(cmds, num_cmds, WIMLIB_UPDATE_OP_ADD)) {
1135                 /* If we have at least one "add" command, create the inode and
1136                  * security descriptor tables to index new inodes and new
1137                  * security descriptors, respectively.  */
1138                 inode_table = alloca(sizeof(struct wim_inode_table));
1139                 sd_set = alloca(sizeof(struct wim_sd_set));
1140
1141                 ret = init_inode_table(inode_table, 9001);
1142                 if (ret)
1143                         goto out;
1144
1145                 ret = init_sd_set(sd_set, wim_security_data(wim));
1146                 if (ret)
1147                         goto out_destroy_inode_table;
1148
1149                 INIT_LIST_HEAD(&unhashed_streams);
1150         } else {
1151                 inode_table = NULL;
1152                 sd_set = NULL;
1153         }
1154
1155         /* Start an in-memory journal to allow rollback if something goes wrong
1156          */
1157         j = new_update_command_journal(num_cmds,
1158                                        &wim_get_current_image_metadata(wim)->root_dentry,
1159                                        wim->lookup_table);
1160         if (!j) {
1161                 ret = WIMLIB_ERR_NOMEM;
1162                 goto out_destroy_sd_set;
1163         }
1164
1165         info.update.completed_commands = 0;
1166         info.update.total_commands = num_cmds;
1167         ret = 0;
1168         for (size_t i = 0; i < num_cmds; i++) {
1169                 DEBUG("Executing update command %zu of %zu (op=%"TS")",
1170                       i + 1, num_cmds, update_op_to_str(cmds[i].op));
1171                 if (update_flags & WIMLIB_UPDATE_FLAG_SEND_PROGRESS &&
1172                     progress_func)
1173                 {
1174                         info.update.command = &cmds[i];
1175                         (*progress_func)(WIMLIB_PROGRESS_MSG_UPDATE_BEGIN_COMMAND,
1176                                          &info);
1177                 }
1178                 ret = WIMLIB_ERR_INVALID_PARAM;
1179                 switch (cmds[i].op) {
1180                 case WIMLIB_UPDATE_OP_ADD:
1181                         ret = execute_add_command(j, wim, &cmds[i], inode_table,
1182                                                   sd_set, &unhashed_streams,
1183                                                   progress_func);
1184                         break;
1185                 case WIMLIB_UPDATE_OP_DELETE:
1186                         ret = execute_delete_command(j, wim, &cmds[i]);
1187                         break;
1188                 case WIMLIB_UPDATE_OP_RENAME:
1189                         ret = execute_rename_command(j, wim, &cmds[i]);
1190                         break;
1191                 }
1192                 if (unlikely(ret))
1193                         goto rollback;
1194                 info.update.completed_commands++;
1195                 if (update_flags & WIMLIB_UPDATE_FLAG_SEND_PROGRESS &&
1196                     progress_func)
1197                 {
1198                         (*progress_func)(WIMLIB_PROGRESS_MSG_UPDATE_END_COMMAND,
1199                                          &info);
1200                 }
1201                 next_command(j);
1202         }
1203
1204         commit_update(j);
1205         if (inode_table) {
1206                 struct wim_image_metadata *imd;
1207
1208                 imd = wim_get_current_image_metadata(wim);
1209
1210                 list_splice_tail(&unhashed_streams, &imd->unhashed_streams);
1211                 inode_table_prepare_inode_list(inode_table, &imd->inode_list);
1212         }
1213         goto out_destroy_sd_set;
1214
1215 rollback:
1216         if (sd_set)
1217                 rollback_new_security_descriptors(sd_set);
1218         rollback_update(j);
1219 out_destroy_sd_set:
1220         if (sd_set)
1221                 destroy_sd_set(sd_set);
1222 out_destroy_inode_table:
1223         if (inode_table)
1224                 destroy_inode_table(inode_table);
1225 out:
1226         return ret;
1227 }
1228
1229
1230 static int
1231 check_add_command(struct wimlib_update_command *cmd,
1232                   const struct wim_header *hdr)
1233 {
1234         int add_flags = cmd->add.add_flags;
1235
1236         if (add_flags & ~(WIMLIB_ADD_FLAG_NTFS |
1237                           WIMLIB_ADD_FLAG_DEREFERENCE |
1238                           WIMLIB_ADD_FLAG_VERBOSE |
1239                           /* BOOT doesn't make sense for wimlib_update_image().  */
1240                           /*WIMLIB_ADD_FLAG_BOOT |*/
1241                           WIMLIB_ADD_FLAG_UNIX_DATA |
1242                           WIMLIB_ADD_FLAG_NO_ACLS |
1243                           WIMLIB_ADD_FLAG_STRICT_ACLS |
1244                           WIMLIB_ADD_FLAG_EXCLUDE_VERBOSE |
1245                           WIMLIB_ADD_FLAG_RPFIX |
1246                           WIMLIB_ADD_FLAG_NORPFIX |
1247                           WIMLIB_ADD_FLAG_NO_UNSUPPORTED_EXCLUDE |
1248                           WIMLIB_ADD_FLAG_WINCONFIG |
1249                           WIMLIB_ADD_FLAG_WIMBOOT |
1250                           WIMLIB_ADD_FLAG_NO_REPLACE))
1251                 return WIMLIB_ERR_INVALID_PARAM;
1252
1253         bool is_entire_image = WIMLIB_IS_WIM_ROOT_PATH(cmd->add.wim_target_path);
1254
1255 #ifndef WITH_NTFS_3G
1256         if (add_flags & WIMLIB_ADD_FLAG_NTFS) {
1257                 ERROR("wimlib was compiled without support for NTFS-3g, so\n"
1258                       "        we cannot capture a WIM image directly "
1259                       "from an NTFS volume");
1260                 return WIMLIB_ERR_UNSUPPORTED;
1261         }
1262 #endif
1263
1264 #ifdef __WIN32__
1265         /* Check for flags not supported on Windows */
1266         if (add_flags & WIMLIB_ADD_FLAG_UNIX_DATA) {
1267                 ERROR("Capturing UNIX-specific data is not supported on Windows");
1268                 return WIMLIB_ERR_UNSUPPORTED;
1269         }
1270         if (add_flags & WIMLIB_ADD_FLAG_DEREFERENCE) {
1271                 ERROR("Dereferencing symbolic links is not supported on Windows");
1272                 return WIMLIB_ERR_UNSUPPORTED;
1273         }
1274 #endif
1275
1276         /* VERBOSE implies EXCLUDE_VERBOSE */
1277         if (add_flags & WIMLIB_ADD_FLAG_VERBOSE)
1278                 add_flags |= WIMLIB_ADD_FLAG_EXCLUDE_VERBOSE;
1279
1280         /* Check for contradictory reparse point fixup flags */
1281         if ((add_flags & (WIMLIB_ADD_FLAG_RPFIX |
1282                           WIMLIB_ADD_FLAG_NORPFIX)) ==
1283                 (WIMLIB_ADD_FLAG_RPFIX |
1284                  WIMLIB_ADD_FLAG_NORPFIX))
1285         {
1286                 ERROR("Cannot specify RPFIX and NORPFIX flags "
1287                       "at the same time!");
1288                 return WIMLIB_ERR_INVALID_PARAM;
1289         }
1290
1291         /* Set default behavior on reparse point fixups if requested */
1292         if ((add_flags & (WIMLIB_ADD_FLAG_RPFIX |
1293                           WIMLIB_ADD_FLAG_NORPFIX)) == 0)
1294         {
1295                 /* Do reparse-point fixups by default if we are capturing an
1296                  * entire image and either the header flag is set from previous
1297                  * images, or if this is the first image being added. */
1298                 if (is_entire_image &&
1299                     ((hdr->flags & WIM_HDR_FLAG_RP_FIX) || hdr->image_count == 1))
1300                         add_flags |= WIMLIB_ADD_FLAG_RPFIX;
1301         }
1302
1303         if (!is_entire_image) {
1304                 if (add_flags & WIMLIB_ADD_FLAG_NTFS) {
1305                         ERROR("Cannot add directly from a NTFS volume "
1306                               "when not capturing a full image!");
1307                         return WIMLIB_ERR_INVALID_PARAM;
1308                 }
1309
1310                 if (add_flags & WIMLIB_ADD_FLAG_RPFIX) {
1311                         ERROR("Cannot do reparse point fixups when "
1312                               "not capturing a full image!");
1313                         return WIMLIB_ERR_INVALID_PARAM;
1314                 }
1315         }
1316         /* We may have modified the add flags. */
1317         cmd->add.add_flags = add_flags;
1318         return 0;
1319 }
1320
1321 static int
1322 check_delete_command(const struct wimlib_update_command *cmd)
1323 {
1324         if (cmd->delete_.delete_flags & ~(WIMLIB_DELETE_FLAG_FORCE |
1325                                           WIMLIB_DELETE_FLAG_RECURSIVE))
1326                 return WIMLIB_ERR_INVALID_PARAM;
1327         return 0;
1328 }
1329
1330 static int
1331 check_rename_command(const struct wimlib_update_command *cmd)
1332 {
1333         if (cmd->rename.rename_flags != 0)
1334                 return WIMLIB_ERR_INVALID_PARAM;
1335         return 0;
1336 }
1337
1338 static int
1339 check_update_command(struct wimlib_update_command *cmd,
1340                      const struct wim_header *hdr)
1341 {
1342         switch (cmd->op) {
1343         case WIMLIB_UPDATE_OP_ADD:
1344                 return check_add_command(cmd, hdr);
1345         case WIMLIB_UPDATE_OP_DELETE:
1346                 return check_delete_command(cmd);
1347         case WIMLIB_UPDATE_OP_RENAME:
1348                 return check_rename_command(cmd);
1349         }
1350         return 0;
1351 }
1352
1353 static int
1354 check_update_commands(struct wimlib_update_command *cmds, size_t num_cmds,
1355                       const struct wim_header *hdr)
1356 {
1357         int ret = 0;
1358         for (size_t i = 0; i < num_cmds; i++) {
1359                 ret = check_update_command(&cmds[i], hdr);
1360                 if (ret)
1361                         break;
1362         }
1363         return ret;
1364 }
1365
1366
1367 static void
1368 free_update_commands(struct wimlib_update_command *cmds, size_t num_cmds)
1369 {
1370         if (cmds) {
1371                 for (size_t i = 0; i < num_cmds; i++) {
1372                         switch (cmds[i].op) {
1373                         case WIMLIB_UPDATE_OP_ADD:
1374                                 FREE(cmds[i].add.wim_target_path);
1375                                 break;
1376                         case WIMLIB_UPDATE_OP_DELETE:
1377                                 FREE(cmds[i].delete_.wim_path);
1378                                 break;
1379                         case WIMLIB_UPDATE_OP_RENAME:
1380                                 FREE(cmds[i].rename.wim_source_path);
1381                                 FREE(cmds[i].rename.wim_target_path);
1382                                 break;
1383                         }
1384                 }
1385                 FREE(cmds);
1386         }
1387 }
1388
1389 static int
1390 copy_update_commands(const struct wimlib_update_command *cmds,
1391                      size_t num_cmds,
1392                      struct wimlib_update_command **cmds_copy_ret)
1393 {
1394         int ret;
1395         struct wimlib_update_command *cmds_copy;
1396
1397         cmds_copy = CALLOC(num_cmds, sizeof(cmds[0]));
1398         if (!cmds_copy)
1399                 goto oom;
1400
1401         for (size_t i = 0; i < num_cmds; i++) {
1402                 cmds_copy[i].op = cmds[i].op;
1403                 switch (cmds[i].op) {
1404                 case WIMLIB_UPDATE_OP_ADD:
1405                         cmds_copy[i].add.fs_source_path = cmds[i].add.fs_source_path;
1406                         cmds_copy[i].add.wim_target_path =
1407                                 canonicalize_wim_path(cmds[i].add.wim_target_path);
1408                         if (!cmds_copy[i].add.wim_target_path)
1409                                 goto oom;
1410                         cmds_copy[i].add.config_file = cmds[i].add.config_file;
1411                         cmds_copy[i].add.add_flags = cmds[i].add.add_flags;
1412                         break;
1413                 case WIMLIB_UPDATE_OP_DELETE:
1414                         cmds_copy[i].delete_.wim_path =
1415                                 canonicalize_wim_path(cmds[i].delete_.wim_path);
1416                         if (!cmds_copy[i].delete_.wim_path)
1417                                 goto oom;
1418                         cmds_copy[i].delete_.delete_flags = cmds[i].delete_.delete_flags;
1419                         break;
1420                 case WIMLIB_UPDATE_OP_RENAME:
1421                         cmds_copy[i].rename.wim_source_path =
1422                                 canonicalize_wim_path(cmds[i].rename.wim_source_path);
1423                         cmds_copy[i].rename.wim_target_path =
1424                                 canonicalize_wim_path(cmds[i].rename.wim_target_path);
1425                         if (!cmds_copy[i].rename.wim_source_path ||
1426                             !cmds_copy[i].rename.wim_target_path)
1427                                 goto oom;
1428                         break;
1429                 default:
1430                         ERROR("Unknown update operation %u", cmds[i].op);
1431                         ret = WIMLIB_ERR_INVALID_PARAM;
1432                         goto err;
1433                 }
1434         }
1435         *cmds_copy_ret = cmds_copy;
1436         ret = 0;
1437 out:
1438         return ret;
1439 oom:
1440         ret = WIMLIB_ERR_NOMEM;
1441 err:
1442         free_update_commands(cmds_copy, num_cmds);
1443         goto out;
1444 }
1445
1446 /* API function documented in wimlib.h  */
1447 WIMLIBAPI int
1448 wimlib_update_image(WIMStruct *wim,
1449                     int image,
1450                     const struct wimlib_update_command *cmds,
1451                     size_t num_cmds,
1452                     int update_flags,
1453                     wimlib_progress_func_t progress_func)
1454 {
1455         int ret;
1456         struct wimlib_update_command *cmds_copy;
1457
1458         if (update_flags & ~WIMLIB_UPDATE_FLAG_SEND_PROGRESS)
1459                 return WIMLIB_ERR_INVALID_PARAM;
1460
1461         DEBUG("Updating image %d with %zu commands", image, num_cmds);
1462
1463         if (have_command_type(cmds, num_cmds, WIMLIB_UPDATE_OP_DELETE))
1464                 ret = can_delete_from_wim(wim);
1465         else
1466                 ret = can_modify_wim(wim);
1467
1468         if (ret)
1469                 goto out;
1470
1471         /* Load the metadata for the image to modify (if not loaded already) */
1472         ret = select_wim_image(wim, image);
1473         if (ret)
1474                 goto out;
1475
1476         DEBUG("Preparing %zu update commands", num_cmds);
1477
1478         /* Make a copy of the update commands, in the process doing certain
1479          * canonicalizations on paths (e.g. translating backslashes to forward
1480          * slashes).  This is done to avoid modifying the caller's copy of the
1481          * commands. */
1482         ret = copy_update_commands(cmds, num_cmds, &cmds_copy);
1483         if (ret)
1484                 goto out;
1485
1486         /* Perform additional checks on the update commands before we execute
1487          * them. */
1488         ret = check_update_commands(cmds_copy, num_cmds, &wim->hdr);
1489         if (ret)
1490                 goto out_free_cmds_copy;
1491
1492         /* Actually execute the update commands. */
1493         DEBUG("Executing %zu update commands", num_cmds);
1494         ret = execute_update_commands(wim, cmds_copy, num_cmds, update_flags,
1495                                       progress_func);
1496         if (ret)
1497                 goto out_free_cmds_copy;
1498
1499         wim->image_metadata[image - 1]->modified = 1;
1500
1501         /* Statistics about the WIM image, such as the numbers of files and
1502          * directories, may have changed.  Call xml_update_image_info() to
1503          * recalculate these statistics. */
1504         xml_update_image_info(wim, image);
1505 out_free_cmds_copy:
1506         free_update_commands(cmds_copy, num_cmds);
1507 out:
1508         return ret;
1509 }