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 "strbuf.h"
   8 #include "quote.h"
   9 #include "cache-tree.h"
  10 #include "tree-walk.h"
  11 #include "cache-tree.h"
  12
  13 /*
  14  * Default to not allowing changes to the list of files. The
  15  * tool doesn't actually care, but this makes it harder to add
  16  * files to the revision control by mistake by doing something
  17  * like "git-update-index *" and suddenly having all the object
  18  * files be revision controlled.
  19  */
  20 static int allow_add;
  21 static int allow_remove;
  22 static int allow_replace;
  23 static int allow_unmerged; /* --refresh needing merge is not error */
  24 static int not_new; /* --refresh not having working tree files is not error */
  25 static int quiet; /* --refresh needing update is not error */
  26 static int info_only;
  27 static int force_remove;
  28 static int verbose;
  29 static int mark_valid_only = 0;
  30 #define MARK_VALID 1
  31 #define UNMARK_VALID 2
  32
  33
  34 /* Three functions to allow overloaded pointer return; see linux/err.h */
  35 static inline void *ERR_PTR(long error)
  36 {
  37         return (void *) error;
  38 }
  39
  40 static inline long PTR_ERR(const void *ptr)
  41 {
  42         return (long) ptr;
  43 }
  44
  45 static inline long IS_ERR(const void *ptr)
  46 {
  47         return (unsigned long)ptr > (unsigned long)-1000L;
  48 }
  49
  50 static void report(const char *fmt, ...)
  51 {
  52         va_list vp;
  53
  54         if (!verbose)
  55                 return;
  56
  57         va_start(vp, fmt);
  58         vprintf(fmt, vp);
  59         putchar('\n');
  60         va_end(vp);
  61 }
  62
  63 static int mark_valid(const char *path)
  64 {
  65         int namelen = strlen(path);
  66         int pos = cache_name_pos(path, namelen);
  67         if (0 <= pos) {
  68                 switch (mark_valid_only) {
  69                 case MARK_VALID:
  70                         active_cache[pos]->ce_flags |= htons(CE_VALID);
  71                         break;
  72                 case UNMARK_VALID:
  73                         active_cache[pos]->ce_flags &= ~htons(CE_VALID);
  74                         break;
  75                 }
  76                 cache_tree_invalidate_path(active_cache_tree, path);
  77                 active_cache_changed = 1;
  78                 return 0;
  79         }
  80         return -1;
  81 }
  82
  83 static int add_file_to_cache(const char *path)
  84 {
  85         int size, namelen, option, status;
  86         struct cache_entry *ce;
  87         struct stat st;
  88
  89         status = lstat(path, &st);
  90
  91         /* We probably want to do this in remove_file_from_cache() and
  92          * add_cache_entry() instead...
  93          */
  94         cache_tree_invalidate_path(active_cache_tree, path);
  95
  96         if (status < 0 || S_ISDIR(st.st_mode)) {
  97                 /* When we used to have "path" and now we want to add
  98                  * "path/file", we need a way to remove "path" before
  99                  * being able to add "path/file".  However,
 100                  * "git-update-index --remove path" would not work.
 101                  * --force-remove can be used but this is more user
 102                  * friendly, especially since we can do the opposite
 103                  * case just fine without --force-remove.
 104                  */
 105                 if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
 106                         if (allow_remove) {
 107                                 if (remove_file_from_cache(path))
 108                                         return error("%s: cannot remove from the index",
 109                                                      path);
 110                                 else
 111                                         return 0;
 112                         } else if (status < 0) {
 113                                 return error("%s: does not exist and --remove not passed",
 114                                              path);
 115                         }
 116                 }
 117                 if (0 == status)
 118                         return error("%s: is a directory - add files inside instead",
 119                                      path);
 120                 else
 121                         return error("lstat(\"%s\"): %s", path,
 122                                      strerror(errno));
 123         }
 124
 125         namelen = strlen(path);
 126         size = cache_entry_size(namelen);
 127         ce = xcalloc(1, size);
 128         memcpy(ce->name, path, namelen);
 129         ce->ce_flags = htons(namelen);
 130         fill_stat_cache_info(ce, &st);
 131
 132         ce->ce_mode = create_ce_mode(st.st_mode);
 133         if (!trust_executable_bit) {
 134                 /* If there is an existing entry, pick the mode bits
 135                  * from it.
 136                  */
 137                 int pos = cache_name_pos(path, namelen);
 138                 if (0 <= pos)
 139                         ce->ce_mode = active_cache[pos]->ce_mode;
 140         }
 141
 142         if (index_path(ce->sha1, path, &st, !info_only))
 143                 return -1;
 144         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 145         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 146         if (add_cache_entry(ce, option))
 147                 return error("%s: cannot add to the index - missing --add option?",
 148                              path);
 149         return 0;
 150 }
 151
 152 /*
 153  * "refresh" does not calculate a new sha1 file or bring the
 154  * cache up-to-date for mode/content changes. But what it
 155  * _does_ do is to "re-match" the stat information of a file
 156  * with the cache, so that you can refresh the cache for a
 157  * file that hasn't been changed but where the stat entry is
 158  * out of date.
 159  *
 160  * For example, you'd want to do this after doing a "git-read-tree",
 161  * to link up the stat cache details with the proper files.
 162  */
 163 static struct cache_entry *refresh_entry(struct cache_entry *ce, int really)
 164 {
 165         struct stat st;
 166         struct cache_entry *updated;
 167         int changed, size;
 168
 169         if (lstat(ce->name, &st) < 0)
 170                 return ERR_PTR(-errno);
 171
 172         changed = ce_match_stat(ce, &st, really);
 173         if (!changed) {
 174                 if (really && assume_unchanged &&
 175                     !(ce->ce_flags & htons(CE_VALID)))
 176                         ; /* mark this one VALID again */
 177                 else
 178                         return NULL;
 179         }
 180
 181         if (ce_modified(ce, &st, really))
 182                 return ERR_PTR(-EINVAL);
 183
 184         size = ce_size(ce);
 185         updated = xmalloc(size);
 186         memcpy(updated, ce, size);
 187         fill_stat_cache_info(updated, &st);
 188
 189         /* In this case, if really is not set, we should leave
 190          * CE_VALID bit alone.  Otherwise, paths marked with
 191          * --no-assume-unchanged (i.e. things to be edited) will
 192          * reacquire CE_VALID bit automatically, which is not
 193          * really what we want.
 194          */
 195         if (!really && assume_unchanged && !(ce->ce_flags & htons(CE_VALID)))
 196                 updated->ce_flags &= ~htons(CE_VALID);
 197
 198         return updated;
 199 }
 200
 201 static int refresh_cache(int really)
 202 {
 203         int i;
 204         int has_errors = 0;
 205
 206         for (i = 0; i < active_nr; i++) {
 207                 struct cache_entry *ce, *new;
 208                 ce = active_cache[i];
 209                 if (ce_stage(ce)) {
 210                         while ((i < active_nr) &&
 211                                ! strcmp(active_cache[i]->name, ce->name))
 212                                 i++;
 213                         i--;
 214                         if (allow_unmerged)
 215                                 continue;
 216                         printf("%s: needs merge\n", ce->name);
 217                         has_errors = 1;
 218                         continue;
 219                 }
 220
 221                 new = refresh_entry(ce, really);
 222                 if (!new)
 223                         continue;
 224                 if (IS_ERR(new)) {
 225                         if (not_new && PTR_ERR(new) == -ENOENT)
 226                                 continue;
 227                         if (really && PTR_ERR(new) == -EINVAL) {
 228                                 /* If we are doing --really-refresh that
 229                                  * means the index is not valid anymore.
 230                                  */
 231                                 ce->ce_flags &= ~htons(CE_VALID);
 232                                 active_cache_changed = 1;
 233                         }
 234                         if (quiet)
 235                                 continue;
 236                         printf("%s: needs update\n", ce->name);
 237                         has_errors = 1;
 238                         continue;
 239                 }
 240                 active_cache_changed = 1;
 241                 /* You can NOT just free active_cache[i] here, since it
 242                  * might not be necessarily malloc()ed but can also come
 243                  * from mmap(). */
 244                 active_cache[i] = new;
 245         }
 246         return has_errors;
 247 }
 248
 249 /*
 250  * We fundamentally don't like some paths: we don't want
 251  * dot or dot-dot anywhere, and for obvious reasons don't
 252  * want to recurse into ".git" either.
 253  *
 254  * Also, we don't want double slashes or slashes at the
 255  * end that can make pathnames ambiguous.
 256  */
 257 static int verify_dotfile(const char *rest)
 258 {
 259         /*
 260          * The first character was '.', but that
 261          * has already been discarded, we now test
 262          * the rest.
 263          */
 264         switch (*rest) {
 265         /* "." is not allowed */
 266         case '\0': case '/':
 267                 return 0;
 268
 269         /*
 270          * ".git" followed by  NUL or slash is bad. This
 271          * shares the path end test with the ".." case.
 272          */
 273         case 'g':
 274                 if (rest[1] != 'i')
 275                         break;
 276                 if (rest[2] != 't')
 277                         break;
 278                 rest += 2;
 279         /* fallthrough */
 280         case '.':
 281                 if (rest[1] == '\0' || rest[1] == '/')
 282                         return 0;
 283         }
 284         return 1;
 285 }
 286
 287 static int verify_path(const char *path)
 288 {
 289         char c;
 290
 291         goto inside;
 292         for (;;) {
 293                 if (!c)
 294                         return 1;
 295                 if (c == '/') {
 296 inside:
 297                         c = *path++;
 298                         switch (c) {
 299                         default:
 300                                 continue;
 301                         case '/': case '\0':
 302                                 break;
 303                         case '.':
 304                                 if (verify_dotfile(path))
 305                                         continue;
 306                         }
 307                         return 0;
 308                 }
 309                 c = *path++;
 310         }
 311 }
 312
 313 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
 314                          const char *path, int stage)
 315 {
 316         int size, len, option;
 317         struct cache_entry *ce;
 318
 319         if (!verify_path(path))
 320                 return -1;
 321
 322         len = strlen(path);
 323         size = cache_entry_size(len);
 324         ce = xcalloc(1, size);
 325
 326         memcpy(ce->sha1, sha1, 20);
 327         memcpy(ce->name, path, len);
 328         ce->ce_flags = create_ce_flags(len, stage);
 329         ce->ce_mode = create_ce_mode(mode);
 330         if (assume_unchanged)
 331                 ce->ce_flags |= htons(CE_VALID);
 332         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 333         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 334         if (add_cache_entry(ce, option))
 335                 return error("%s: cannot add to the index - missing --add option?",
 336                              path);
 337         report("add '%s'", path);
 338         cache_tree_invalidate_path(active_cache_tree, path);
 339         return 0;
 340 }
 341
 342 static void chmod_path(int flip, const char *path)
 343 {
 344         int pos;
 345         struct cache_entry *ce;
 346         unsigned int mode;
 347
 348         pos = cache_name_pos(path, strlen(path));
 349         if (pos < 0)
 350                 goto fail;
 351         ce = active_cache[pos];
 352         mode = ntohl(ce->ce_mode);
 353         if (!S_ISREG(mode))
 354                 goto fail;
 355         switch (flip) {
 356         case '+':
 357                 ce->ce_mode |= htonl(0111); break;
 358         case '-':
 359                 ce->ce_mode &= htonl(~0111); break;
 360         default:
 361                 goto fail;
 362         }
 363         cache_tree_invalidate_path(active_cache_tree, path);
 364         active_cache_changed = 1;
 365         report("chmod %cx '%s'", flip, path);
 366         return;
 367  fail:
 368         die("git-update-index: cannot chmod %cx '%s'", flip, path);
 369 }
 370
 371 static struct cache_file cache_file;
 372
 373 static void update_one(const char *path, const char *prefix, int prefix_length)
 374 {
 375         const char *p = prefix_path(prefix, prefix_length, path);
 376         if (!verify_path(p)) {
 377                 fprintf(stderr, "Ignoring path %s\n", path);
 378                 return;
 379         }
 380         if (mark_valid_only) {
 381                 if (mark_valid(p))
 382                         die("Unable to mark file %s", path);
 383                 return;
 384         }
 385         cache_tree_invalidate_path(active_cache_tree, path);
 386
 387         if (force_remove) {
 388                 if (remove_file_from_cache(p))
 389                         die("git-update-index: unable to remove %s", path);
 390                 report("remove '%s'", path);
 391                 return;
 392         }
 393         if (add_file_to_cache(p))
 394                 die("Unable to process file %s", path);
 395         report("add '%s'", path);
 396 }
 397
 398 static void read_index_info(int line_termination)
 399 {
 400         struct strbuf buf;
 401         strbuf_init(&buf);
 402         while (1) {
 403                 char *ptr, *tab;
 404                 char *path_name;
 405                 unsigned char sha1[20];
 406                 unsigned int mode;
 407                 int stage;
 408
 409                 /* This reads lines formatted in one of three formats:
 410                  *
 411                  * (1) mode         SP sha1          TAB path
 412                  * The first format is what "git-apply --index-info"
 413                  * reports, and used to reconstruct a partial tree
 414                  * that is used for phony merge base tree when falling
 415                  * back on 3-way merge.
 416                  *
 417                  * (2) mode SP type SP sha1          TAB path
 418                  * The second format is to stuff git-ls-tree output
 419                  * into the index file.
 420                  *
 421                  * (3) mode         SP sha1 SP stage TAB path
 422                  * This format is to put higher order stages into the
 423                  * index file and matches git-ls-files --stage output.
 424                  */
 425                 read_line(&buf, stdin, line_termination);
 426                 if (buf.eof)
 427                         break;
 428
 429                 mode = strtoul(buf.buf, &ptr, 8);
 430                 if (ptr == buf.buf || *ptr != ' ')
 431                         goto bad_line;
 432
 433                 tab = strchr(ptr, '\t');
 434                 if (!tab || tab - ptr < 41)
 435                         goto bad_line;
 436
 437                 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
 438                         stage = tab[-1] - '0';
 439                         ptr = tab + 1; /* point at the head of path */
 440                         tab = tab - 2; /* point at tail of sha1 */
 441                 }
 442                 else {
 443                         stage = 0;
 444                         ptr = tab + 1; /* point at the head of path */
 445                 }
 446
 447                 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
 448                         goto bad_line;
 449
 450                 if (line_termination && ptr[0] == '"')
 451                         path_name = unquote_c_style(ptr, NULL);
 452                 else
 453                         path_name = ptr;
 454
 455                 if (!verify_path(path_name)) {
 456                         fprintf(stderr, "Ignoring path %s\n", path_name);
 457                         if (path_name != ptr)
 458                                 free(path_name);
 459                         continue;
 460                 }
 461                 cache_tree_invalidate_path(active_cache_tree, path_name);
 462
 463                 if (!mode) {
 464                         /* mode == 0 means there is no such path -- remove */
 465                         if (remove_file_from_cache(path_name))
 466                                 die("git-update-index: unable to remove %s",
 467                                     ptr);
 468                 }
 469                 else {
 470                         /* mode ' ' sha1 '\t' name
 471                          * ptr[-1] points at tab,
 472                          * ptr[-41] is at the beginning of sha1
 473                          */
 474                         ptr[-42] = ptr[-1] = 0;
 475                         if (add_cacheinfo(mode, sha1, path_name, stage))
 476                                 die("git-update-index: unable to update %s",
 477                                     path_name);
 478                 }
 479                 if (path_name != ptr)
 480                         free(path_name);
 481                 continue;
 482
 483         bad_line:
 484                 die("malformed index info %s", buf.buf);
 485         }
 486 }
 487
 488 static const char update_index_usage[] =
 489 "git-update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--cacheinfo] [--chmod=(+|-)x] [--info-only] [--force-remove] [--stdin] [--index-info] [--ignore-missing] [-z] [--verbose] [--] <file>...";
 490
 491 static unsigned char head_sha1[20];
 492 static unsigned char merge_head_sha1[20];
 493
 494 static struct cache_entry *read_one_ent(const char *which,
 495                                         unsigned char *ent, const char *path,
 496                                         int namelen, int stage)
 497 {
 498         unsigned mode;
 499         unsigned char sha1[20];
 500         int size;
 501         struct cache_entry *ce;
 502
 503         if (get_tree_entry(ent, path, sha1, &mode)) {
 504                 error("%s: not in %s branch.", path, which);
 505                 return NULL;
 506         }
 507         if (mode == S_IFDIR) {
 508                 error("%s: not a blob in %s branch.", path, which);
 509                 return NULL;
 510         }
 511         size = cache_entry_size(namelen);
 512         ce = xcalloc(1, size);
 513
 514         memcpy(ce->sha1, sha1, 20);
 515         memcpy(ce->name, path, namelen);
 516         ce->ce_flags = create_ce_flags(namelen, stage);
 517         ce->ce_mode = create_ce_mode(mode);
 518         return ce;
 519 }
 520
 521 static int unresolve_one(const char *path)
 522 {
 523         int namelen = strlen(path);
 524         int pos;
 525         int ret = 0;
 526         struct cache_entry *ce_2 = NULL, *ce_3 = NULL;
 527
 528         /* See if there is such entry in the index. */
 529         pos = cache_name_pos(path, namelen);
 530         if (pos < 0) {
 531                 /* If there isn't, either it is unmerged, or
 532                  * resolved as "removed" by mistake.  We do not
 533                  * want to do anything in the former case.
 534                  */
 535                 pos = -pos-1;
 536                 if (pos < active_nr) {
 537                         struct cache_entry *ce = active_cache[pos];
 538                         if (ce_namelen(ce) == namelen &&
 539                             !memcmp(ce->name, path, namelen)) {
 540                                 fprintf(stderr,
 541                                         "%s: skipping still unmerged path.\n",
 542                                         path);
 543                                 goto free_return;
 544                         }
 545                 }
 546         }
 547
 548         /* Grab blobs from given path from HEAD and MERGE_HEAD,
 549          * stuff HEAD version in stage #2,
 550          * stuff MERGE_HEAD version in stage #3.
 551          */
 552         ce_2 = read_one_ent("our", head_sha1, path, namelen, 2);
 553         ce_3 = read_one_ent("their", merge_head_sha1, path, namelen, 3);
 554
 555         if (!ce_2 || !ce_3) {
 556                 ret = -1;
 557                 goto free_return;
 558         }
 559         if (!memcmp(ce_2->sha1, ce_3->sha1, 20) &&
 560             ce_2->ce_mode == ce_3->ce_mode) {
 561                 fprintf(stderr, "%s: identical in both, skipping.\n",
 562                         path);
 563                 goto free_return;
 564         }
 565
 566         cache_tree_invalidate_path(active_cache_tree, path);
 567         remove_file_from_cache(path);
 568         if (add_cache_entry(ce_2, ADD_CACHE_OK_TO_ADD)) {
 569                 error("%s: cannot add our version to the index.", path);
 570                 ret = -1;
 571                 goto free_return;
 572         }
 573         if (!add_cache_entry(ce_3, ADD_CACHE_OK_TO_ADD))
 574                 return 0;
 575         error("%s: cannot add their version to the index.", path);
 576         ret = -1;
 577  free_return:
 578         free(ce_2);
 579         free(ce_3);
 580         return ret;
 581 }
 582
 583 static void read_head_pointers(void)
 584 {
 585         if (read_ref(git_path("HEAD"), head_sha1))
 586                 die("No HEAD -- no initial commit yet?\n");
 587         if (read_ref(git_path("MERGE_HEAD"), merge_head_sha1)) {
 588                 fprintf(stderr, "Not in the middle of a merge.\n");
 589                 exit(0);
 590         }
 591 }
 592
 593 static int do_unresolve(int ac, const char **av)
 594 {
 595         int i;
 596         int err = 0;
 597
 598         /* Read HEAD and MERGE_HEAD; if MERGE_HEAD does not exist, we
 599          * are not doing a merge, so exit with success status.
 600          */
 601         read_head_pointers();
 602
 603         for (i = 1; i < ac; i++) {
 604                 const char *arg = av[i];
 605                 err |= unresolve_one(arg);
 606         }
 607         return err;
 608 }
 609
 610 int main(int argc, const char **argv)
 611 {
 612         int i, newfd, entries, has_errors = 0, line_termination = '\n';
 613         int allow_options = 1;
 614         int read_from_stdin = 0;
 615         const char *prefix = setup_git_directory();
 616         int prefix_length = prefix ? strlen(prefix) : 0;
 617         char set_executable_bit = 0;
 618
 619         git_config(git_default_config);
 620
 621         newfd = hold_index_file_for_update(&cache_file, get_index_file());
 622         if (newfd < 0)
 623                 die("unable to create new cachefile");
 624
 625         entries = read_cache();
 626         if (entries < 0)
 627                 die("cache corrupted");
 628
 629         for (i = 1 ; i < argc; i++) {
 630                 const char *path = argv[i];
 631
 632                 if (allow_options && *path == '-') {
 633                         if (!strcmp(path, "--")) {
 634                                 allow_options = 0;
 635                                 continue;
 636                         }
 637                         if (!strcmp(path, "-q")) {
 638                                 quiet = 1;
 639                                 continue;
 640                         }
 641                         if (!strcmp(path, "--add")) {
 642                                 allow_add = 1;
 643                                 continue;
 644                         }
 645                         if (!strcmp(path, "--replace")) {
 646                                 allow_replace = 1;
 647                                 continue;
 648                         }
 649                         if (!strcmp(path, "--remove")) {
 650                                 allow_remove = 1;
 651                                 continue;
 652                         }
 653                         if (!strcmp(path, "--unmerged")) {
 654                                 allow_unmerged = 1;
 655                                 continue;
 656                         }
 657                         if (!strcmp(path, "--refresh")) {
 658                                 has_errors |= refresh_cache(0);
 659                                 continue;
 660                         }
 661                         if (!strcmp(path, "--really-refresh")) {
 662                                 has_errors |= refresh_cache(1);
 663                                 continue;
 664                         }
 665                         if (!strcmp(path, "--cacheinfo")) {
 666                                 unsigned char sha1[20];
 667                                 unsigned int mode;
 668
 669                                 if (i+3 >= argc)
 670                                         die("git-update-index: --cacheinfo <mode> <sha1> <path>");
 671
 672                                 if ((sscanf(argv[i+1], "%o", &mode) != 1) ||
 673                                     get_sha1_hex(argv[i+2], sha1) ||
 674                                     add_cacheinfo(mode, sha1, argv[i+3], 0))
 675                                         die("git-update-index: --cacheinfo"
 676                                             " cannot add %s", argv[i+3]);
 677                                 i += 3;
 678                                 continue;
 679                         }
 680                         if (!strcmp(path, "--chmod=-x") ||
 681                             !strcmp(path, "--chmod=+x")) {
 682                                 if (argc <= i+1)
 683                                         die("git-update-index: %s <path>", path);
 684                                 set_executable_bit = path[8];
 685                                 continue;
 686                         }
 687                         if (!strcmp(path, "--assume-unchanged")) {
 688                                 mark_valid_only = MARK_VALID;
 689                                 continue;
 690                         }
 691                         if (!strcmp(path, "--no-assume-unchanged")) {
 692                                 mark_valid_only = UNMARK_VALID;
 693                                 continue;
 694                         }
 695                         if (!strcmp(path, "--info-only")) {
 696                                 info_only = 1;
 697                                 continue;
 698                         }
 699                         if (!strcmp(path, "--force-remove")) {
 700                                 force_remove = 1;
 701                                 continue;
 702                         }
 703                         if (!strcmp(path, "-z")) {
 704                                 line_termination = 0;
 705                                 continue;
 706                         }
 707                         if (!strcmp(path, "--stdin")) {
 708                                 if (i != argc - 1)
 709                                         die("--stdin must be at the end");
 710                                 read_from_stdin = 1;
 711                                 break;
 712                         }
 713                         if (!strcmp(path, "--index-info")) {
 714                                 if (i != argc - 1)
 715                                         die("--index-info must be at the end");
 716                                 allow_add = allow_replace = allow_remove = 1;
 717                                 read_index_info(line_termination);
 718                                 break;
 719                         }
 720                         if (!strcmp(path, "--unresolve")) {
 721                                 has_errors = do_unresolve(argc - i, argv + i);
 722                                 if (has_errors)
 723                                         active_cache_changed = 0;
 724                                 goto finish;
 725                         }
 726                         if (!strcmp(path, "--ignore-missing")) {
 727                                 not_new = 1;
 728                                 continue;
 729                         }
 730                         if (!strcmp(path, "--verbose")) {
 731                                 verbose = 1;
 732                                 continue;
 733                         }
 734                         if (!strcmp(path, "-h") || !strcmp(path, "--help"))
 735                                 usage(update_index_usage);
 736                         die("unknown option %s", path);
 737                 }
 738                 update_one(path, prefix, prefix_length);
 739                 if (set_executable_bit)
 740                         chmod_path(set_executable_bit, path);
 741         }
 742         if (read_from_stdin) {
 743                 struct strbuf buf;
 744                 strbuf_init(&buf);
 745                 while (1) {
 746                         char *path_name;
 747                         read_line(&buf, stdin, line_termination);
 748                         if (buf.eof)
 749                                 break;
 750                         if (line_termination && buf.buf[0] == '"')
 751                                 path_name = unquote_c_style(buf.buf, NULL);
 752                         else
 753                                 path_name = buf.buf;
 754                         update_one(path_name, prefix, prefix_length);
 755                         if (set_executable_bit) {
 756                                 const char *p = prefix_path(prefix, prefix_length, path_name);
 757                                 chmod_path(set_executable_bit, p);
 758                         }
 759                         if (path_name != buf.buf)
 760                                 free(path_name);
 761                 }
 762         }
 763
 764  finish:
 765         if (active_cache_changed) {
 766                 if (write_cache(newfd, active_cache, active_nr) ||
 767                     commit_index_file(&cache_file))
 768                         die("Unable to write new cachefile");
 769         }
 770
 771         return has_errors ? 1 : 0;
 772 }