builtin/update-index.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7 #include "quote.h"
   8 #include "cache-tree.h"
   9 #include "tree-walk.h"
  10 #include "builtin.h"
  11 #include "refs.h"
  12 #include "resolve-undo.h"
  13
  14 /*
  15  * Default to not allowing changes to the list of files. The
  16  * tool doesn't actually care, but this makes it harder to add
  17  * files to the revision control by mistake by doing something
  18  * like "git update-index *" and suddenly having all the object
  19  * files be revision controlled.
  20  */
  21 static int allow_add;
  22 static int allow_remove;
  23 static int allow_replace;
  24 static int info_only;
  25 static int force_remove;
  26 static int verbose;
  27 static int mark_valid_only;
  28 static int mark_skip_worktree_only;
  29 #define MARK_FLAG 1
  30 #define UNMARK_FLAG 2
  31
  32 __attribute__((format (printf, 1, 2)))
  33 static void report(const char *fmt, ...)
  34 {
  35         va_list vp;
  36
  37         if (!verbose)
  38                 return;
  39
  40         va_start(vp, fmt);
  41         vprintf(fmt, vp);
  42         putchar('\n');
  43         va_end(vp);
  44 }
  45
  46 static int mark_ce_flags(const char *path, int flag, int mark)
  47 {
  48         int namelen = strlen(path);
  49         int pos = cache_name_pos(path, namelen);
  50         if (0 <= pos) {
  51                 if (mark)
  52                         active_cache[pos]->ce_flags |= flag;
  53                 else
  54                         active_cache[pos]->ce_flags &= ~flag;
  55                 cache_tree_invalidate_path(active_cache_tree, path);
  56                 active_cache_changed = 1;
  57                 return 0;
  58         }
  59         return -1;
  60 }
  61
  62 static int remove_one_path(const char *path)
  63 {
  64         if (!allow_remove)
  65                 return error("%s: does not exist and --remove not passed", path);
  66         if (remove_file_from_cache(path))
  67                 return error("%s: cannot remove from the index", path);
  68         return 0;
  69 }
  70
  71 /*
  72  * Handle a path that couldn't be lstat'ed. It's either:
  73  *  - missing file (ENOENT or ENOTDIR). That's ok if we're
  74  *    supposed to be removing it and the removal actually
  75  *    succeeds.
  76  *  - permission error. That's never ok.
  77  */
  78 static int process_lstat_error(const char *path, int err)
  79 {
  80         if (err == ENOENT || err == ENOTDIR)
  81                 return remove_one_path(path);
  82         return error("lstat(\"%s\"): %s", path, strerror(errno));
  83 }
  84
  85 static int add_one_path(struct cache_entry *old, const char *path, int len, struct stat *st)
  86 {
  87         int option, size;
  88         struct cache_entry *ce;
  89
  90         /* Was the old index entry already up-to-date? */
  91         if (old && !ce_stage(old) && !ce_match_stat(old, st, 0))
  92                 return 0;
  93
  94         size = cache_entry_size(len);
  95         ce = xcalloc(1, size);
  96         memcpy(ce->name, path, len);
  97         ce->ce_flags = len;
  98         fill_stat_cache_info(ce, st);
  99         ce->ce_mode = ce_mode_from_stat(old, st->st_mode);
 100
 101         if (index_path(ce->sha1, path, st, !info_only))
 102                 return -1;
 103         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 104         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 105         if (add_cache_entry(ce, option))
 106                 return error("%s: cannot add to the index - missing --add option?", path);
 107         return 0;
 108 }
 109
 110 /*
 111  * Handle a path that was a directory. Four cases:
 112  *
 113  *  - it's already a gitlink in the index, and we keep it that
 114  *    way, and update it if we can (if we cannot find the HEAD,
 115  *    we're going to keep it unchanged in the index!)
 116  *
 117  *  - it's a *file* in the index, in which case it should be
 118  *    removed as a file if removal is allowed, since it doesn't
 119  *    exist as such any more. If removal isn't allowed, it's
 120  *    an error.
 121  *
 122  *    (NOTE! This is old and arguably fairly strange behaviour.
 123  *    We might want to make this an error unconditionally, and
 124  *    use "--force-remove" if you actually want to force removal).
 125  *
 126  *  - it used to exist as a subdirectory (ie multiple files with
 127  *    this particular prefix) in the index, in which case it's wrong
 128  *    to try to update it as a directory.
 129  *
 130  *  - it doesn't exist at all in the index, but it is a valid
 131  *    git directory, and it should be *added* as a gitlink.
 132  */
 133 static int process_directory(const char *path, int len, struct stat *st)
 134 {
 135         unsigned char sha1[20];
 136         int pos = cache_name_pos(path, len);
 137
 138         /* Exact match: file or existing gitlink */
 139         if (pos >= 0) {
 140                 struct cache_entry *ce = active_cache[pos];
 141                 if (S_ISGITLINK(ce->ce_mode)) {
 142
 143                         /* Do nothing to the index if there is no HEAD! */
 144                         if (resolve_gitlink_ref(path, "HEAD", sha1) < 0)
 145                                 return 0;
 146
 147                         return add_one_path(ce, path, len, st);
 148                 }
 149                 /* Should this be an unconditional error? */
 150                 return remove_one_path(path);
 151         }
 152
 153         /* Inexact match: is there perhaps a subdirectory match? */
 154         pos = -pos-1;
 155         while (pos < active_nr) {
 156                 struct cache_entry *ce = active_cache[pos++];
 157
 158                 if (strncmp(ce->name, path, len))
 159                         break;
 160                 if (ce->name[len] > '/')
 161                         break;
 162                 if (ce->name[len] < '/')
 163                         continue;
 164
 165                 /* Subdirectory match - error out */
 166                 return error("%s: is a directory - add individual files instead", path);
 167         }
 168
 169         /* No match - should we add it as a gitlink? */
 170         if (!resolve_gitlink_ref(path, "HEAD", sha1))
 171                 return add_one_path(NULL, path, len, st);
 172
 173         /* Error out. */
 174         return error("%s: is a directory - add files inside instead", path);
 175 }
 176
 177 static int process_path(const char *path)
 178 {
 179         int pos, len;
 180         struct stat st;
 181         struct cache_entry *ce;
 182
 183         len = strlen(path);
 184         if (has_symlink_leading_path(path, len))
 185                 return error("'%s' is beyond a symbolic link", path);
 186
 187         pos = cache_name_pos(path, len);
 188         ce = pos < 0 ? NULL : active_cache[pos];
 189         if (ce && ce_skip_worktree(ce)) {
 190                 /*
 191                  * working directory version is assumed "good"
 192                  * so updating it does not make sense.
 193                  * On the other hand, removing it from index should work
 194                  */
 195                 if (allow_remove && remove_file_from_cache(path))
 196                         return error("%s: cannot remove from the index", path);
 197                 return 0;
 198         }
 199
 200         /*
 201          * First things first: get the stat information, to decide
 202          * what to do about the pathname!
 203          */
 204         if (lstat(path, &st) < 0)
 205                 return process_lstat_error(path, errno);
 206
 207         if (S_ISDIR(st.st_mode))
 208                 return process_directory(path, len, &st);
 209
 210         /*
 211          * Process a regular file
 212          */
 213         if (ce && S_ISGITLINK(ce->ce_mode))
 214                 return error("%s is already a gitlink, not replacing", path);
 215
 216         return add_one_path(ce, path, len, &st);
 217 }
 218
 219 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
 220                          const char *path, int stage)
 221 {
 222         int size, len, option;
 223         struct cache_entry *ce;
 224
 225         if (!verify_path(path))
 226                 return error("Invalid path '%s'", path);
 227
 228         len = strlen(path);
 229         size = cache_entry_size(len);
 230         ce = xcalloc(1, size);
 231
 232         hashcpy(ce->sha1, sha1);
 233         memcpy(ce->name, path, len);
 234         ce->ce_flags = create_ce_flags(len, stage);
 235         ce->ce_mode = create_ce_mode(mode);
 236         if (assume_unchanged)
 237                 ce->ce_flags |= CE_VALID;
 238         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 239         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 240         if (add_cache_entry(ce, option))
 241                 return error("%s: cannot add to the index - missing --add option?",
 242                              path);
 243         report("add '%s'", path);
 244         return 0;
 245 }
 246
 247 static void chmod_path(int flip, const char *path)
 248 {
 249         int pos;
 250         struct cache_entry *ce;
 251         unsigned int mode;
 252
 253         pos = cache_name_pos(path, strlen(path));
 254         if (pos < 0)
 255                 goto fail;
 256         ce = active_cache[pos];
 257         mode = ce->ce_mode;
 258         if (!S_ISREG(mode))
 259                 goto fail;
 260         switch (flip) {
 261         case '+':
 262                 ce->ce_mode |= 0111; break;
 263         case '-':
 264                 ce->ce_mode &= ~0111; break;
 265         default:
 266                 goto fail;
 267         }
 268         cache_tree_invalidate_path(active_cache_tree, path);
 269         active_cache_changed = 1;
 270         report("chmod %cx '%s'", flip, path);
 271         return;
 272  fail:
 273         die("git update-index: cannot chmod %cx '%s'", flip, path);
 274 }
 275
 276 static void update_one(const char *path, const char *prefix, int prefix_length)
 277 {
 278         const char *p = prefix_path(prefix, prefix_length, path);
 279         if (!verify_path(p)) {
 280                 fprintf(stderr, "Ignoring path %s\n", path);
 281                 goto free_return;
 282         }
 283         if (mark_valid_only) {
 284                 if (mark_ce_flags(p, CE_VALID, mark_valid_only == MARK_FLAG))
 285                         die("Unable to mark file %s", path);
 286                 goto free_return;
 287         }
 288         if (mark_skip_worktree_only) {
 289                 if (mark_ce_flags(p, CE_SKIP_WORKTREE, mark_skip_worktree_only == MARK_FLAG))
 290                         die("Unable to mark file %s", path);
 291                 goto free_return;
 292         }
 293
 294         if (force_remove) {
 295                 if (remove_file_from_cache(p))
 296                         die("git update-index: unable to remove %s", path);
 297                 report("remove '%s'", path);
 298                 goto free_return;
 299         }
 300         if (process_path(p))
 301                 die("Unable to process path %s", path);
 302         report("add '%s'", path);
 303  free_return:
 304         if (p < path || p > path + strlen(path))
 305                 free((char *)p);
 306 }
 307
 308 static void read_index_info(int line_termination)
 309 {
 310         struct strbuf buf = STRBUF_INIT;
 311         struct strbuf uq = STRBUF_INIT;
 312
 313         while (strbuf_getline(&buf, stdin, line_termination) != EOF) {
 314                 char *ptr, *tab;
 315                 char *path_name;
 316                 unsigned char sha1[20];
 317                 unsigned int mode;
 318                 unsigned long ul;
 319                 int stage;
 320
 321                 /* This reads lines formatted in one of three formats:
 322                  *
 323                  * (1) mode         SP sha1          TAB path
 324                  * The first format is what "git apply --index-info"
 325                  * reports, and used to reconstruct a partial tree
 326                  * that is used for phony merge base tree when falling
 327                  * back on 3-way merge.
 328                  *
 329                  * (2) mode SP type SP sha1          TAB path
 330                  * The second format is to stuff "git ls-tree" output
 331                  * into the index file.
 332                  *
 333                  * (3) mode         SP sha1 SP stage TAB path
 334                  * This format is to put higher order stages into the
 335                  * index file and matches "git ls-files --stage" output.
 336                  */
 337                 errno = 0;
 338                 ul = strtoul(buf.buf, &ptr, 8);
 339                 if (ptr == buf.buf || *ptr != ' '
 340                     || errno || (unsigned int) ul != ul)
 341                         goto bad_line;
 342                 mode = ul;
 343
 344                 tab = strchr(ptr, '\t');
 345                 if (!tab || tab - ptr < 41)
 346                         goto bad_line;
 347
 348                 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
 349                         stage = tab[-1] - '0';
 350                         ptr = tab + 1; /* point at the head of path */
 351                         tab = tab - 2; /* point at tail of sha1 */
 352                 }
 353                 else {
 354                         stage = 0;
 355                         ptr = tab + 1; /* point at the head of path */
 356                 }
 357
 358                 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
 359                         goto bad_line;
 360
 361                 path_name = ptr;
 362                 if (line_termination && path_name[0] == '"') {
 363                         strbuf_reset(&uq);
 364                         if (unquote_c_style(&uq, path_name, NULL)) {
 365                                 die("git update-index: bad quoting of path name");
 366                         }
 367                         path_name = uq.buf;
 368                 }
 369
 370                 if (!verify_path(path_name)) {
 371                         fprintf(stderr, "Ignoring path %s\n", path_name);
 372                         continue;
 373                 }
 374
 375                 if (!mode) {
 376                         /* mode == 0 means there is no such path -- remove */
 377                         if (remove_file_from_cache(path_name))
 378                                 die("git update-index: unable to remove %s",
 379                                     ptr);
 380                 }
 381                 else {
 382                         /* mode ' ' sha1 '\t' name
 383                          * ptr[-1] points at tab,
 384                          * ptr[-41] is at the beginning of sha1
 385                          */
 386                         ptr[-42] = ptr[-1] = 0;
 387                         if (add_cacheinfo(mode, sha1, path_name, stage))
 388                                 die("git update-index: unable to update %s",
 389                                     path_name);
 390                 }
 391                 continue;
 392
 393         bad_line:
 394                 die("malformed index info %s", buf.buf);
 395         }
 396         strbuf_release(&buf);
 397         strbuf_release(&uq);
 398 }
 399
 400 static const char update_index_usage[] =
 401 "git update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--really-refresh] [--cacheinfo] [--chmod=(+|-)x] [--assume-unchanged] [--skip-worktree|--no-skip-worktree] [--info-only] [--force-remove] [--stdin] [--index-info] [--unresolve] [--again | -g] [--ignore-missing] [-z] [--verbose] [--] [<file>...]";
 402
 403 static unsigned char head_sha1[20];
 404 static unsigned char merge_head_sha1[20];
 405
 406 static struct cache_entry *read_one_ent(const char *which,
 407                                         unsigned char *ent, const char *path,
 408                                         int namelen, int stage)
 409 {
 410         unsigned mode;
 411         unsigned char sha1[20];
 412         int size;
 413         struct cache_entry *ce;
 414
 415         if (get_tree_entry(ent, path, sha1, &mode)) {
 416                 if (which)
 417                         error("%s: not in %s branch.", path, which);
 418                 return NULL;
 419         }
 420         if (mode == S_IFDIR) {
 421                 if (which)
 422                         error("%s: not a blob in %s branch.", path, which);
 423                 return NULL;
 424         }
 425         size = cache_entry_size(namelen);
 426         ce = xcalloc(1, size);
 427
 428         hashcpy(ce->sha1, sha1);
 429         memcpy(ce->name, path, namelen);
 430         ce->ce_flags = create_ce_flags(namelen, stage);
 431         ce->ce_mode = create_ce_mode(mode);
 432         return ce;
 433 }
 434
 435 static int unresolve_one(const char *path)
 436 {
 437         int namelen = strlen(path);
 438         int pos;
 439         int ret = 0;
 440         struct cache_entry *ce_2 = NULL, *ce_3 = NULL;
 441
 442         /* See if there is such entry in the index. */
 443         pos = cache_name_pos(path, namelen);
 444         if (0 <= pos) {
 445                 /* already merged */
 446                 pos = unmerge_cache_entry_at(pos);
 447                 if (pos < active_nr) {
 448                         struct cache_entry *ce = active_cache[pos];
 449                         if (ce_stage(ce) &&
 450                             ce_namelen(ce) == namelen &&
 451                             !memcmp(ce->name, path, namelen))
 452                                 return 0;
 453                 }
 454                 /* no resolve-undo information; fall back */
 455         } else {
 456                 /* If there isn't, either it is unmerged, or
 457                  * resolved as "removed" by mistake.  We do not
 458                  * want to do anything in the former case.
 459                  */
 460                 pos = -pos-1;
 461                 if (pos < active_nr) {
 462                         struct cache_entry *ce = active_cache[pos];
 463                         if (ce_namelen(ce) == namelen &&
 464                             !memcmp(ce->name, path, namelen)) {
 465                                 fprintf(stderr,
 466                                         "%s: skipping still unmerged path.\n",
 467                                         path);
 468                                 goto free_return;
 469                         }
 470                 }
 471         }
 472
 473         /* Grab blobs from given path from HEAD and MERGE_HEAD,
 474          * stuff HEAD version in stage #2,
 475          * stuff MERGE_HEAD version in stage #3.
 476          */
 477         ce_2 = read_one_ent("our", head_sha1, path, namelen, 2);
 478         ce_3 = read_one_ent("their", merge_head_sha1, path, namelen, 3);
 479
 480         if (!ce_2 || !ce_3) {
 481                 ret = -1;
 482                 goto free_return;
 483         }
 484         if (!hashcmp(ce_2->sha1, ce_3->sha1) &&
 485             ce_2->ce_mode == ce_3->ce_mode) {
 486                 fprintf(stderr, "%s: identical in both, skipping.\n",
 487                         path);
 488                 goto free_return;
 489         }
 490
 491         remove_file_from_cache(path);
 492         if (add_cache_entry(ce_2, ADD_CACHE_OK_TO_ADD)) {
 493                 error("%s: cannot add our version to the index.", path);
 494                 ret = -1;
 495                 goto free_return;
 496         }
 497         if (!add_cache_entry(ce_3, ADD_CACHE_OK_TO_ADD))
 498                 return 0;
 499         error("%s: cannot add their version to the index.", path);
 500         ret = -1;
 501  free_return:
 502         free(ce_2);
 503         free(ce_3);
 504         return ret;
 505 }
 506
 507 static void read_head_pointers(void)
 508 {
 509         if (read_ref("HEAD", head_sha1))
 510                 die("No HEAD -- no initial commit yet?");
 511         if (read_ref("MERGE_HEAD", merge_head_sha1)) {
 512                 fprintf(stderr, "Not in the middle of a merge.\n");
 513                 exit(0);
 514         }
 515 }
 516
 517 static int do_unresolve(int ac, const char **av,
 518                         const char *prefix, int prefix_length)
 519 {
 520         int i;
 521         int err = 0;
 522
 523         /* Read HEAD and MERGE_HEAD; if MERGE_HEAD does not exist, we
 524          * are not doing a merge, so exit with success status.
 525          */
 526         read_head_pointers();
 527
 528         for (i = 1; i < ac; i++) {
 529                 const char *arg = av[i];
 530                 const char *p = prefix_path(prefix, prefix_length, arg);
 531                 err |= unresolve_one(p);
 532                 if (p < arg || p > arg + strlen(arg))
 533                         free((char *)p);
 534         }
 535         return err;
 536 }
 537
 538 static int do_reupdate(int ac, const char **av,
 539                        const char *prefix, int prefix_length)
 540 {
 541         /* Read HEAD and run update-index on paths that are
 542          * merged and already different between index and HEAD.
 543          */
 544         int pos;
 545         int has_head = 1;
 546         const char **pathspec = get_pathspec(prefix, av + 1);
 547
 548         if (read_ref("HEAD", head_sha1))
 549                 /* If there is no HEAD, that means it is an initial
 550                  * commit.  Update everything in the index.
 551                  */
 552                 has_head = 0;
 553  redo:
 554         for (pos = 0; pos < active_nr; pos++) {
 555                 struct cache_entry *ce = active_cache[pos];
 556                 struct cache_entry *old = NULL;
 557                 int save_nr;
 558
 559                 if (ce_stage(ce) || !ce_path_match(ce, pathspec))
 560                         continue;
 561                 if (has_head)
 562                         old = read_one_ent(NULL, head_sha1,
 563                                            ce->name, ce_namelen(ce), 0);
 564                 if (old && ce->ce_mode == old->ce_mode &&
 565                     !hashcmp(ce->sha1, old->sha1)) {
 566                         free(old);
 567                         continue; /* unchanged */
 568                 }
 569                 /* Be careful.  The working tree may not have the
 570                  * path anymore, in which case, under 'allow_remove',
 571                  * or worse yet 'allow_replace', active_nr may decrease.
 572                  */
 573                 save_nr = active_nr;
 574                 update_one(ce->name + prefix_length, prefix, prefix_length);
 575                 if (save_nr != active_nr)
 576                         goto redo;
 577         }
 578         return 0;
 579 }
 580
 581 int cmd_update_index(int argc, const char **argv, const char *prefix)
 582 {
 583         int i, newfd, entries, has_errors = 0, line_termination = '\n';
 584         int allow_options = 1;
 585         int read_from_stdin = 0;
 586         int prefix_length = prefix ? strlen(prefix) : 0;
 587         char set_executable_bit = 0;
 588         unsigned int refresh_flags = 0;
 589         int lock_error = 0;
 590         struct lock_file *lock_file;
 591
 592         git_config(git_default_config, NULL);
 593
 594         /* We can't free this memory, it becomes part of a linked list parsed atexit() */
 595         lock_file = xcalloc(1, sizeof(struct lock_file));
 596
 597         newfd = hold_locked_index(lock_file, 0);
 598         if (newfd < 0)
 599                 lock_error = errno;
 600
 601         entries = read_cache();
 602         if (entries < 0)
 603                 die("cache corrupted");
 604
 605         for (i = 1 ; i < argc; i++) {
 606                 const char *path = argv[i];
 607                 const char *p;
 608
 609                 if (allow_options && *path == '-') {
 610                         if (!strcmp(path, "--")) {
 611                                 allow_options = 0;
 612                                 continue;
 613                         }
 614                         if (!strcmp(path, "-q")) {
 615                                 refresh_flags |= REFRESH_QUIET;
 616                                 continue;
 617                         }
 618                         if (!strcmp(path, "--ignore-submodules")) {
 619                                 refresh_flags |= REFRESH_IGNORE_SUBMODULES;
 620                                 continue;
 621                         }
 622                         if (!strcmp(path, "--add")) {
 623                                 allow_add = 1;
 624                                 continue;
 625                         }
 626                         if (!strcmp(path, "--replace")) {
 627                                 allow_replace = 1;
 628                                 continue;
 629                         }
 630                         if (!strcmp(path, "--remove")) {
 631                                 allow_remove = 1;
 632                                 continue;
 633                         }
 634                         if (!strcmp(path, "--unmerged")) {
 635                                 refresh_flags |= REFRESH_UNMERGED;
 636                                 continue;
 637                         }
 638                         if (!strcmp(path, "--refresh")) {
 639                                 setup_work_tree();
 640                                 has_errors |= refresh_cache(refresh_flags);
 641                                 continue;
 642                         }
 643                         if (!strcmp(path, "--really-refresh")) {
 644                                 setup_work_tree();
 645                                 has_errors |= refresh_cache(REFRESH_REALLY | refresh_flags);
 646                                 continue;
 647                         }
 648                         if (!strcmp(path, "--cacheinfo")) {
 649                                 unsigned char sha1[20];
 650                                 unsigned int mode;
 651
 652                                 if (i+3 >= argc)
 653                                         die("git update-index: --cacheinfo <mode> <sha1> <path>");
 654
 655                                 if (strtoul_ui(argv[i+1], 8, &mode) ||
 656                                     get_sha1_hex(argv[i+2], sha1) ||
 657                                     add_cacheinfo(mode, sha1, argv[i+3], 0))
 658                                         die("git update-index: --cacheinfo"
 659                                             " cannot add %s", argv[i+3]);
 660                                 i += 3;
 661                                 continue;
 662                         }
 663                         if (!strcmp(path, "--chmod=-x") ||
 664                             !strcmp(path, "--chmod=+x")) {
 665                                 if (argc <= i+1)
 666                                         die("git update-index: %s <path>", path);
 667                                 set_executable_bit = path[8];
 668                                 continue;
 669                         }
 670                         if (!strcmp(path, "--assume-unchanged")) {
 671                                 mark_valid_only = MARK_FLAG;
 672                                 continue;
 673                         }
 674                         if (!strcmp(path, "--no-assume-unchanged")) {
 675                                 mark_valid_only = UNMARK_FLAG;
 676                                 continue;
 677                         }
 678                         if (!strcmp(path, "--no-skip-worktree")) {
 679                                 mark_skip_worktree_only = UNMARK_FLAG;
 680                                 continue;
 681                         }
 682                         if (!strcmp(path, "--skip-worktree")) {
 683                                 mark_skip_worktree_only = MARK_FLAG;
 684                                 continue;
 685                         }
 686                         if (!strcmp(path, "--info-only")) {
 687                                 info_only = 1;
 688                                 continue;
 689                         }
 690                         if (!strcmp(path, "--force-remove")) {
 691                                 force_remove = 1;
 692                                 continue;
 693                         }
 694                         if (!strcmp(path, "-z")) {
 695                                 line_termination = 0;
 696                                 continue;
 697                         }
 698                         if (!strcmp(path, "--stdin")) {
 699                                 if (i != argc - 1)
 700                                         die("--stdin must be at the end");
 701                                 read_from_stdin = 1;
 702                                 break;
 703                         }
 704                         if (!strcmp(path, "--index-info")) {
 705                                 if (i != argc - 1)
 706                                         die("--index-info must be at the end");
 707                                 allow_add = allow_replace = allow_remove = 1;
 708                                 read_index_info(line_termination);
 709                                 break;
 710                         }
 711                         if (!strcmp(path, "--unresolve")) {
 712                                 has_errors = do_unresolve(argc - i, argv + i,
 713                                                           prefix, prefix_length);
 714                                 if (has_errors)
 715                                         active_cache_changed = 0;
 716                                 goto finish;
 717                         }
 718                         if (!strcmp(path, "--again") || !strcmp(path, "-g")) {
 719                                 setup_work_tree();
 720                                 has_errors = do_reupdate(argc - i, argv + i,
 721                                                          prefix, prefix_length);
 722                                 if (has_errors)
 723                                         active_cache_changed = 0;
 724                                 goto finish;
 725                         }
 726                         if (!strcmp(path, "--ignore-missing")) {
 727                                 refresh_flags |= REFRESH_IGNORE_MISSING;
 728                                 continue;
 729                         }
 730                         if (!strcmp(path, "--verbose")) {
 731                                 verbose = 1;
 732                                 continue;
 733                         }
 734                         if (!strcmp(path, "--clear-resolve-undo")) {
 735                                 resolve_undo_clear();
 736                                 continue;
 737                         }
 738                         if (!strcmp(path, "-h") || !strcmp(path, "--help"))
 739                                 usage(update_index_usage);
 740                         die("unknown option %s", path);
 741                 }
 742                 setup_work_tree();
 743                 p = prefix_path(prefix, prefix_length, path);
 744                 update_one(p, NULL, 0);
 745                 if (set_executable_bit)
 746                         chmod_path(set_executable_bit, p);
 747                 if (p < path || p > path + strlen(path))
 748                         free((char *)p);
 749         }
 750         if (read_from_stdin) {
 751                 struct strbuf buf = STRBUF_INIT, nbuf = STRBUF_INIT;
 752
 753                 setup_work_tree();
 754                 while (strbuf_getline(&buf, stdin, line_termination) != EOF) {
 755                         const char *p;
 756                         if (line_termination && buf.buf[0] == '"') {
 757                                 strbuf_reset(&nbuf);
 758                                 if (unquote_c_style(&nbuf, buf.buf, NULL))
 759                                         die("line is badly quoted");
 760                                 strbuf_swap(&buf, &nbuf);
 761                         }
 762                         p = prefix_path(prefix, prefix_length, buf.buf);
 763                         update_one(p, NULL, 0);
 764                         if (set_executable_bit)
 765                                 chmod_path(set_executable_bit, p);
 766                         if (p < buf.buf || p > buf.buf + buf.len)
 767                                 free((char *)p);
 768                 }
 769                 strbuf_release(&nbuf);
 770                 strbuf_release(&buf);
 771         }
 772
 773  finish:
 774         if (active_cache_changed) {
 775                 if (newfd < 0) {
 776                         if (refresh_flags & REFRESH_QUIET)
 777                                 exit(128);
 778                         unable_to_lock_index_die(get_index_file(), lock_error);
 779                 }
 780                 if (write_cache(newfd, active_cache, active_nr) ||
 781                     commit_locked_index(lock_file))
 782                         die("Unable to write new index file");
 783         }
 784
 785         rollback_lock_file(lock_file);
 786
 787         return has_errors ? 1 : 0;
 788 }