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
  12 /*
  13  * Default to not allowing changes to the list of files. The
  14  * tool doesn't actually care, but this makes it harder to add
  15  * files to the revision control by mistake by doing something
  16  * like "git-update-index *" and suddenly having all the object
  17  * files be revision controlled.
  18  */
  19 static int allow_add;
  20 static int allow_remove;
  21 static int allow_replace;
  22 static int allow_unmerged; /* --refresh needing merge is not error */
  23 static int not_new; /* --refresh not having working tree files is not error */
  24 static int quiet; /* --refresh needing update is not error */
  25 static int info_only;
  26 static int force_remove;
  27 static int verbose;
  28 static int mark_valid_only = 0;
  29 #define MARK_VALID 1
  30 #define UNMARK_VALID 2
  31
  32
  33 /* Three functions to allow overloaded pointer return; see linux/err.h */
  34 static inline void *ERR_PTR(long error)
  35 {
  36         return (void *) error;
  37 }
  38
  39 static inline long PTR_ERR(const void *ptr)
  40 {
  41         return (long) ptr;
  42 }
  43
  44 static inline long IS_ERR(const void *ptr)
  45 {
  46         return (unsigned long)ptr > (unsigned long)-1000L;
  47 }
  48
  49 static void report(const char *fmt, ...)
  50 {
  51         va_list vp;
  52
  53         if (!verbose)
  54                 return;
  55
  56         va_start(vp, fmt);
  57         vprintf(fmt, vp);
  58         putchar('\n');
  59         va_end(vp);
  60 }
  61
  62 static int mark_valid(const char *path)
  63 {
  64         int namelen = strlen(path);
  65         int pos = cache_name_pos(path, namelen);
  66         if (0 <= pos) {
  67                 switch (mark_valid_only) {
  68                 case MARK_VALID:
  69                         active_cache[pos]->ce_flags |= htons(CE_VALID);
  70                         break;
  71                 case UNMARK_VALID:
  72                         active_cache[pos]->ce_flags &= ~htons(CE_VALID);
  73                         break;
  74                 }
  75                 cache_tree_invalidate_path(active_cache_tree, path);
  76                 active_cache_changed = 1;
  77                 return 0;
  78         }
  79         return -1;
  80 }
  81
  82 static int add_file_to_cache(const char *path)
  83 {
  84         int size, namelen, option, status;
  85         struct cache_entry *ce;
  86         struct stat st;
  87
  88         status = lstat(path, &st);
  89
  90         /* We probably want to do this in remove_file_from_cache() and
  91          * add_cache_entry() instead...
  92          */
  93         cache_tree_invalidate_path(active_cache_tree, path);
  94
  95         if (status < 0 || S_ISDIR(st.st_mode)) {
  96                 /* When we used to have "path" and now we want to add
  97                  * "path/file", we need a way to remove "path" before
  98                  * being able to add "path/file".  However,
  99                  * "git-update-index --remove path" would not work.
 100                  * --force-remove can be used but this is more user
 101                  * friendly, especially since we can do the opposite
 102                  * case just fine without --force-remove.
 103                  */
 104                 if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
 105                         if (allow_remove) {
 106                                 if (remove_file_from_cache(path))
 107                                         return error("%s: cannot remove from the index",
 108                                                      path);
 109                                 else
 110                                         return 0;
 111                         } else if (status < 0) {
 112                                 return error("%s: does not exist and --remove not passed",
 113                                              path);
 114                         }
 115                 }
 116                 if (0 == status)
 117                         return error("%s: is a directory - add files inside instead",
 118                                      path);
 119                 else
 120                         return error("lstat(\"%s\"): %s", path,
 121                                      strerror(errno));
 122         }
 123
 124         namelen = strlen(path);
 125         size = cache_entry_size(namelen);
 126         ce = xcalloc(1, size);
 127         memcpy(ce->name, path, namelen);
 128         ce->ce_flags = htons(namelen);
 129         fill_stat_cache_info(ce, &st);
 130
 131         ce->ce_mode = create_ce_mode(st.st_mode);
 132         if (!trust_executable_bit) {
 133                 /* If there is an existing entry, pick the mode bits
 134                  * from it.
 135                  */
 136                 int pos = cache_name_pos(path, namelen);
 137                 if (0 <= pos)
 138                         ce->ce_mode = active_cache[pos]->ce_mode;
 139         }
 140
 141         if (index_path(ce->sha1, path, &st, !info_only))
 142                 return -1;
 143         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 144         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 145         if (add_cache_entry(ce, option))
 146                 return error("%s: cannot add to the index - missing --add option?",
 147                              path);
 148         return 0;
 149 }
 150
 151 /*
 152  * "refresh" does not calculate a new sha1 file or bring the
 153  * cache up-to-date for mode/content changes. But what it
 154  * _does_ do is to "re-match" the stat information of a file
 155  * with the cache, so that you can refresh the cache for a
 156  * file that hasn't been changed but where the stat entry is
 157  * out of date.
 158  *
 159  * For example, you'd want to do this after doing a "git-read-tree",
 160  * to link up the stat cache details with the proper files.
 161  */
 162 static struct cache_entry *refresh_entry(struct cache_entry *ce, int really)
 163 {
 164         struct stat st;
 165         struct cache_entry *updated;
 166         int changed, size;
 167
 168         if (lstat(ce->name, &st) < 0)
 169                 return ERR_PTR(-errno);
 170
 171         changed = ce_match_stat(ce, &st, really);
 172         if (!changed) {
 173                 if (really && assume_unchanged &&
 174                     !(ce->ce_flags & htons(CE_VALID)))
 175                         ; /* mark this one VALID again */
 176                 else
 177                         return NULL;
 178         }
 179
 180         if (ce_modified(ce, &st, really))
 181                 return ERR_PTR(-EINVAL);
 182
 183         size = ce_size(ce);
 184         updated = xmalloc(size);
 185         memcpy(updated, ce, size);
 186         fill_stat_cache_info(updated, &st);
 187
 188         /* In this case, if really is not set, we should leave
 189          * CE_VALID bit alone.  Otherwise, paths marked with
 190          * --no-assume-unchanged (i.e. things to be edited) will
 191          * reacquire CE_VALID bit automatically, which is not
 192          * really what we want.
 193          */
 194         if (!really && assume_unchanged && !(ce->ce_flags & htons(CE_VALID)))
 195                 updated->ce_flags &= ~htons(CE_VALID);
 196
 197         return updated;
 198 }
 199
 200 static int refresh_cache(int really)
 201 {
 202         int i;
 203         int has_errors = 0;
 204
 205         for (i = 0; i < active_nr; i++) {
 206                 struct cache_entry *ce, *new;
 207                 ce = active_cache[i];
 208                 if (ce_stage(ce)) {
 209                         while ((i < active_nr) &&
 210                                ! strcmp(active_cache[i]->name, ce->name))
 211                                 i++;
 212                         i--;
 213                         if (allow_unmerged)
 214                                 continue;
 215                         printf("%s: needs merge\n", ce->name);
 216                         has_errors = 1;
 217                         continue;
 218                 }
 219
 220                 new = refresh_entry(ce, really);
 221                 if (!new)
 222                         continue;
 223                 if (IS_ERR(new)) {
 224                         if (not_new && PTR_ERR(new) == -ENOENT)
 225                                 continue;
 226                         if (really && PTR_ERR(new) == -EINVAL) {
 227                                 /* If we are doing --really-refresh that
 228                                  * means the index is not valid anymore.
 229                                  */
 230                                 ce->ce_flags &= ~htons(CE_VALID);
 231                                 active_cache_changed = 1;
 232                         }
 233                         if (quiet)
 234                                 continue;
 235                         printf("%s: needs update\n", ce->name);
 236                         has_errors = 1;
 237                         continue;
 238                 }
 239                 active_cache_changed = 1;
 240                 /* You can NOT just free active_cache[i] here, since it
 241                  * might not be necessarily malloc()ed but can also come
 242                  * from mmap(). */
 243                 active_cache[i] = new;
 244         }
 245         return has_errors;
 246 }
 247
 248 /*
 249  * We fundamentally don't like some paths: we don't want
 250  * dot or dot-dot anywhere, and for obvious reasons don't
 251  * want to recurse into ".git" either.
 252  *
 253  * Also, we don't want double slashes or slashes at the
 254  * end that can make pathnames ambiguous.
 255  */
 256 static int verify_dotfile(const char *rest)
 257 {
 258         /*
 259          * The first character was '.', but that
 260          * has already been discarded, we now test
 261          * the rest.
 262          */
 263         switch (*rest) {
 264         /* "." is not allowed */
 265         case '\0': case '/':
 266                 return 0;
 267
 268         /*
 269          * ".git" followed by  NUL or slash is bad. This
 270          * shares the path end test with the ".." case.
 271          */
 272         case 'g':
 273                 if (rest[1] != 'i')
 274                         break;
 275                 if (rest[2] != 't')
 276                         break;
 277                 rest += 2;
 278         /* fallthrough */
 279         case '.':
 280                 if (rest[1] == '\0' || rest[1] == '/')
 281                         return 0;
 282         }
 283         return 1;
 284 }
 285
 286 static int verify_path(const char *path)
 287 {
 288         char c;
 289
 290         goto inside;
 291         for (;;) {
 292                 if (!c)
 293                         return 1;
 294                 if (c == '/') {
 295 inside:
 296                         c = *path++;
 297                         switch (c) {
 298                         default:
 299                                 continue;
 300                         case '/': case '\0':
 301                                 break;
 302                         case '.':
 303                                 if (verify_dotfile(path))
 304                                         continue;
 305                         }
 306                         return 0;
 307                 }
 308                 c = *path++;
 309         }
 310 }
 311
 312 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
 313                          const char *path, int stage)
 314 {
 315         int size, len, option;
 316         struct cache_entry *ce;
 317
 318         if (!verify_path(path))
 319                 return -1;
 320
 321         len = strlen(path);
 322         size = cache_entry_size(len);
 323         ce = xcalloc(1, size);
 324
 325         memcpy(ce->sha1, sha1, 20);
 326         memcpy(ce->name, path, len);
 327         ce->ce_flags = create_ce_flags(len, stage);
 328         ce->ce_mode = create_ce_mode(mode);
 329         if (assume_unchanged)
 330                 ce->ce_flags |= htons(CE_VALID);
 331         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 332         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 333         if (add_cache_entry(ce, option))
 334                 return error("%s: cannot add to the index - missing --add option?",
 335                              path);
 336         report("add '%s'", path);
 337         cache_tree_invalidate_path(active_cache_tree, path);
 338         return 0;
 339 }
 340
 341 static void chmod_path(int flip, const char *path)
 342 {
 343         int pos;
 344         struct cache_entry *ce;
 345         unsigned int mode;
 346
 347         pos = cache_name_pos(path, strlen(path));
 348         if (pos < 0)
 349                 goto fail;
 350         ce = active_cache[pos];
 351         mode = ntohl(ce->ce_mode);
 352         if (!S_ISREG(mode))
 353                 goto fail;
 354         switch (flip) {
 355         case '+':
 356                 ce->ce_mode |= htonl(0111); break;
 357         case '-':
 358                 ce->ce_mode &= htonl(~0111); break;
 359         default:
 360                 goto fail;
 361         }
 362         cache_tree_invalidate_path(active_cache_tree, path);
 363         active_cache_changed = 1;
 364         report("chmod %cx '%s'", flip, path);
 365         return;
 366  fail:
 367         die("git-update-index: cannot chmod %cx '%s'", flip, path);
 368 }
 369
 370 static struct cache_file cache_file;
 371
 372 static void update_one(const char *path, const char *prefix, int prefix_length)
 373 {
 374         const char *p = prefix_path(prefix, prefix_length, path);
 375         if (!verify_path(p)) {
 376                 fprintf(stderr, "Ignoring path %s\n", path);
 377                 goto free_return;
 378         }
 379         if (mark_valid_only) {
 380                 if (mark_valid(p))
 381                         die("Unable to mark file %s", path);
 382                 goto free_return;
 383         }
 384         cache_tree_invalidate_path(active_cache_tree, path);
 385
 386         if (force_remove) {
 387                 if (remove_file_from_cache(p))
 388                         die("git-update-index: unable to remove %s", path);
 389                 report("remove '%s'", path);
 390                 goto free_return;
 391         }
 392         if (add_file_to_cache(p))
 393                 die("Unable to process file %s", path);
 394         report("add '%s'", path);
 395  free_return:
 396         if (p < path || p > path + strlen(path))
 397                 free((char*)p);
 398 }
 399
 400 static void read_index_info(int line_termination)
 401 {
 402         struct strbuf buf;
 403         strbuf_init(&buf);
 404         while (1) {
 405                 char *ptr, *tab;
 406                 char *path_name;
 407                 unsigned char sha1[20];
 408                 unsigned int mode;
 409                 int stage;
 410
 411                 /* This reads lines formatted in one of three formats:
 412                  *
 413                  * (1) mode         SP sha1          TAB path
 414                  * The first format is what "git-apply --index-info"
 415                  * reports, and used to reconstruct a partial tree
 416                  * that is used for phony merge base tree when falling
 417                  * back on 3-way merge.
 418                  *
 419                  * (2) mode SP type SP sha1          TAB path
 420                  * The second format is to stuff git-ls-tree output
 421                  * into the index file.
 422                  *
 423                  * (3) mode         SP sha1 SP stage TAB path
 424                  * This format is to put higher order stages into the
 425                  * index file and matches git-ls-files --stage output.
 426                  */
 427                 read_line(&buf, stdin, line_termination);
 428                 if (buf.eof)
 429                         break;
 430
 431                 mode = strtoul(buf.buf, &ptr, 8);
 432                 if (ptr == buf.buf || *ptr != ' ')
 433                         goto bad_line;
 434
 435                 tab = strchr(ptr, '\t');
 436                 if (!tab || tab - ptr < 41)
 437                         goto bad_line;
 438
 439                 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
 440                         stage = tab[-1] - '0';
 441                         ptr = tab + 1; /* point at the head of path */
 442                         tab = tab - 2; /* point at tail of sha1 */
 443                 }
 444                 else {
 445                         stage = 0;
 446                         ptr = tab + 1; /* point at the head of path */
 447                 }
 448
 449                 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
 450                         goto bad_line;
 451
 452                 if (line_termination && ptr[0] == '"')
 453                         path_name = unquote_c_style(ptr, NULL);
 454                 else
 455                         path_name = ptr;
 456
 457                 if (!verify_path(path_name)) {
 458                         fprintf(stderr, "Ignoring path %s\n", path_name);
 459                         if (path_name != ptr)
 460                                 free(path_name);
 461                         continue;
 462                 }
 463                 cache_tree_invalidate_path(active_cache_tree, path_name);
 464
 465                 if (!mode) {
 466                         /* mode == 0 means there is no such path -- remove */
 467                         if (remove_file_from_cache(path_name))
 468                                 die("git-update-index: unable to remove %s",
 469                                     ptr);
 470                 }
 471                 else {
 472                         /* mode ' ' sha1 '\t' name
 473                          * ptr[-1] points at tab,
 474                          * ptr[-41] is at the beginning of sha1
 475                          */
 476                         ptr[-42] = ptr[-1] = 0;
 477                         if (add_cacheinfo(mode, sha1, path_name, stage))
 478                                 die("git-update-index: unable to update %s",
 479                                     path_name);
 480                 }
 481                 if (path_name != ptr)
 482                         free(path_name);
 483                 continue;
 484
 485         bad_line:
 486                 die("malformed index info %s", buf.buf);
 487         }
 488 }
 489
 490 static const char update_index_usage[] =
 491 "git-update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--really-refresh] [--cacheinfo] [--chmod=(+|-)x] [--assume-unchanged] [--info-only] [--force-remove] [--stdin] [--index-info] [--unresolve] [--again] [--ignore-missing] [-z] [--verbose] [--] <file>...";
 492
 493 static unsigned char head_sha1[20];
 494 static unsigned char merge_head_sha1[20];
 495
 496 static struct cache_entry *read_one_ent(const char *which,
 497                                         unsigned char *ent, const char *path,
 498                                         int namelen, int stage)
 499 {
 500         unsigned mode;
 501         unsigned char sha1[20];
 502         int size;
 503         struct cache_entry *ce;
 504
 505         if (get_tree_entry(ent, path, sha1, &mode)) {
 506                 if (which)
 507                         error("%s: not in %s branch.", path, which);
 508                 return NULL;
 509         }
 510         if (mode == S_IFDIR) {
 511                 if (which)
 512                         error("%s: not a blob in %s branch.", path, which);
 513                 return NULL;
 514         }
 515         size = cache_entry_size(namelen);
 516         ce = xcalloc(1, size);
 517
 518         memcpy(ce->sha1, sha1, 20);
 519         memcpy(ce->name, path, namelen);
 520         ce->ce_flags = create_ce_flags(namelen, stage);
 521         ce->ce_mode = create_ce_mode(mode);
 522         return ce;
 523 }
 524
 525 static int unresolve_one(const char *path)
 526 {
 527         int namelen = strlen(path);
 528         int pos;
 529         int ret = 0;
 530         struct cache_entry *ce_2 = NULL, *ce_3 = NULL;
 531
 532         /* See if there is such entry in the index. */
 533         pos = cache_name_pos(path, namelen);
 534         if (pos < 0) {
 535                 /* If there isn't, either it is unmerged, or
 536                  * resolved as "removed" by mistake.  We do not
 537                  * want to do anything in the former case.
 538                  */
 539                 pos = -pos-1;
 540                 if (pos < active_nr) {
 541                         struct cache_entry *ce = active_cache[pos];
 542                         if (ce_namelen(ce) == namelen &&
 543                             !memcmp(ce->name, path, namelen)) {
 544                                 fprintf(stderr,
 545                                         "%s: skipping still unmerged path.\n",
 546                                         path);
 547                                 goto free_return;
 548                         }
 549                 }
 550         }
 551
 552         /* Grab blobs from given path from HEAD and MERGE_HEAD,
 553          * stuff HEAD version in stage #2,
 554          * stuff MERGE_HEAD version in stage #3.
 555          */
 556         ce_2 = read_one_ent("our", head_sha1, path, namelen, 2);
 557         ce_3 = read_one_ent("their", merge_head_sha1, path, namelen, 3);
 558
 559         if (!ce_2 || !ce_3) {
 560                 ret = -1;
 561                 goto free_return;
 562         }
 563         if (!memcmp(ce_2->sha1, ce_3->sha1, 20) &&
 564             ce_2->ce_mode == ce_3->ce_mode) {
 565                 fprintf(stderr, "%s: identical in both, skipping.\n",
 566                         path);
 567                 goto free_return;
 568         }
 569
 570         cache_tree_invalidate_path(active_cache_tree, path);
 571         remove_file_from_cache(path);
 572         if (add_cache_entry(ce_2, ADD_CACHE_OK_TO_ADD)) {
 573                 error("%s: cannot add our version to the index.", path);
 574                 ret = -1;
 575                 goto free_return;
 576         }
 577         if (!add_cache_entry(ce_3, ADD_CACHE_OK_TO_ADD))
 578                 return 0;
 579         error("%s: cannot add their version to the index.", path);
 580         ret = -1;
 581  free_return:
 582         free(ce_2);
 583         free(ce_3);
 584         return ret;
 585 }
 586
 587 static void read_head_pointers(void)
 588 {
 589         if (read_ref(git_path("HEAD"), head_sha1))
 590                 die("No HEAD -- no initial commit yet?\n");
 591         if (read_ref(git_path("MERGE_HEAD"), merge_head_sha1)) {
 592                 fprintf(stderr, "Not in the middle of a merge.\n");
 593                 exit(0);
 594         }
 595 }
 596
 597 static int do_unresolve(int ac, const char **av,
 598                         const char *prefix, int prefix_length)
 599 {
 600         int i;
 601         int err = 0;
 602
 603         /* Read HEAD and MERGE_HEAD; if MERGE_HEAD does not exist, we
 604          * are not doing a merge, so exit with success status.
 605          */
 606         read_head_pointers();
 607
 608         for (i = 1; i < ac; i++) {
 609                 const char *arg = av[i];
 610                 const char *p = prefix_path(prefix, prefix_length, arg);
 611                 err |= unresolve_one(p);
 612                 if (p < arg || p > arg + strlen(arg))
 613                         free((char*)p);
 614         }
 615         return err;
 616 }
 617
 618 static int do_reupdate(int ac, const char **av,
 619                        const char *prefix, int prefix_length)
 620 {
 621         /* Read HEAD and run update-index on paths that are
 622          * merged and already different between index and HEAD.
 623          */
 624         int pos;
 625         int has_head = 1;
 626         const char **pathspec = get_pathspec(prefix, av + 1);
 627
 628         if (read_ref(git_path("HEAD"), head_sha1))
 629                 /* If there is no HEAD, that means it is an initial
 630                  * commit.  Update everything in the index.
 631                  */
 632                 has_head = 0;
 633  redo:
 634         for (pos = 0; pos < active_nr; pos++) {
 635                 struct cache_entry *ce = active_cache[pos];
 636                 struct cache_entry *old = NULL;
 637                 int save_nr;
 638
 639                 if (ce_stage(ce) || !ce_path_match(ce, pathspec))
 640                         continue;
 641                 if (has_head)
 642                         old = read_one_ent(NULL, head_sha1,
 643                                            ce->name, ce_namelen(ce), 0);
 644                 if (old && ce->ce_mode == old->ce_mode &&
 645                     !memcmp(ce->sha1, old->sha1, 20)) {
 646                         free(old);
 647                         continue; /* unchanged */
 648                 }
 649                 /* Be careful.  The working tree may not have the
 650                  * path anymore, in which case, under 'allow_remove',
 651                  * or worse yet 'allow_replace', active_nr may decrease.
 652                  */
 653                 save_nr = active_nr;
 654                 update_one(ce->name + prefix_length, prefix, prefix_length);
 655                 if (save_nr != active_nr)
 656                         goto redo;
 657         }
 658         return 0;
 659 }
 660
 661 int main(int argc, const char **argv)
 662 {
 663         int i, newfd, entries, has_errors = 0, line_termination = '\n';
 664         int allow_options = 1;
 665         int read_from_stdin = 0;
 666         const char *prefix = setup_git_directory();
 667         int prefix_length = prefix ? strlen(prefix) : 0;
 668         char set_executable_bit = 0;
 669
 670         git_config(git_default_config);
 671
 672         newfd = hold_index_file_for_update(&cache_file, get_index_file());
 673         if (newfd < 0)
 674                 die("unable to create new cachefile");
 675
 676         entries = read_cache();
 677         if (entries < 0)
 678                 die("cache corrupted");
 679
 680         for (i = 1 ; i < argc; i++) {
 681                 const char *path = argv[i];
 682
 683                 if (allow_options && *path == '-') {
 684                         if (!strcmp(path, "--")) {
 685                                 allow_options = 0;
 686                                 continue;
 687                         }
 688                         if (!strcmp(path, "-q")) {
 689                                 quiet = 1;
 690                                 continue;
 691                         }
 692                         if (!strcmp(path, "--add")) {
 693                                 allow_add = 1;
 694                                 continue;
 695                         }
 696                         if (!strcmp(path, "--replace")) {
 697                                 allow_replace = 1;
 698                                 continue;
 699                         }
 700                         if (!strcmp(path, "--remove")) {
 701                                 allow_remove = 1;
 702                                 continue;
 703                         }
 704                         if (!strcmp(path, "--unmerged")) {
 705                                 allow_unmerged = 1;
 706                                 continue;
 707                         }
 708                         if (!strcmp(path, "--refresh")) {
 709                                 has_errors |= refresh_cache(0);
 710                                 continue;
 711                         }
 712                         if (!strcmp(path, "--really-refresh")) {
 713                                 has_errors |= refresh_cache(1);
 714                                 continue;
 715                         }
 716                         if (!strcmp(path, "--cacheinfo")) {
 717                                 unsigned char sha1[20];
 718                                 unsigned int mode;
 719
 720                                 if (i+3 >= argc)
 721                                         die("git-update-index: --cacheinfo <mode> <sha1> <path>");
 722
 723                                 if ((sscanf(argv[i+1], "%o", &mode) != 1) ||
 724                                     get_sha1_hex(argv[i+2], sha1) ||
 725                                     add_cacheinfo(mode, sha1, argv[i+3], 0))
 726                                         die("git-update-index: --cacheinfo"
 727                                             " cannot add %s", argv[i+3]);
 728                                 i += 3;
 729                                 continue;
 730                         }
 731                         if (!strcmp(path, "--chmod=-x") ||
 732                             !strcmp(path, "--chmod=+x")) {
 733                                 if (argc <= i+1)
 734                                         die("git-update-index: %s <path>", path);
 735                                 set_executable_bit = path[8];
 736                                 continue;
 737                         }
 738                         if (!strcmp(path, "--assume-unchanged")) {
 739                                 mark_valid_only = MARK_VALID;
 740                                 continue;
 741                         }
 742                         if (!strcmp(path, "--no-assume-unchanged")) {
 743                                 mark_valid_only = UNMARK_VALID;
 744                                 continue;
 745                         }
 746                         if (!strcmp(path, "--info-only")) {
 747                                 info_only = 1;
 748                                 continue;
 749                         }
 750                         if (!strcmp(path, "--force-remove")) {
 751                                 force_remove = 1;
 752                                 continue;
 753                         }
 754                         if (!strcmp(path, "-z")) {
 755                                 line_termination = 0;
 756                                 continue;
 757                         }
 758                         if (!strcmp(path, "--stdin")) {
 759                                 if (i != argc - 1)
 760                                         die("--stdin must be at the end");
 761                                 read_from_stdin = 1;
 762                                 break;
 763                         }
 764                         if (!strcmp(path, "--index-info")) {
 765                                 if (i != argc - 1)
 766                                         die("--index-info must be at the end");
 767                                 allow_add = allow_replace = allow_remove = 1;
 768                                 read_index_info(line_termination);
 769                                 break;
 770                         }
 771                         if (!strcmp(path, "--unresolve")) {
 772                                 has_errors = do_unresolve(argc - i, argv + i,
 773                                                           prefix, prefix_length);
 774                                 if (has_errors)
 775                                         active_cache_changed = 0;
 776                                 goto finish;
 777                         }
 778                         if (!strcmp(path, "--again")) {
 779                                 has_errors = do_reupdate(argc - i, argv + i,
 780                                                          prefix, prefix_length);
 781                                 if (has_errors)
 782                                         active_cache_changed = 0;
 783                                 goto finish;
 784                         }
 785                         if (!strcmp(path, "--ignore-missing")) {
 786                                 not_new = 1;
 787                                 continue;
 788                         }
 789                         if (!strcmp(path, "--verbose")) {
 790                                 verbose = 1;
 791                                 continue;
 792                         }
 793                         if (!strcmp(path, "-h") || !strcmp(path, "--help"))
 794                                 usage(update_index_usage);
 795                         die("unknown option %s", path);
 796                 }
 797                 update_one(path, prefix, prefix_length);
 798                 if (set_executable_bit)
 799                         chmod_path(set_executable_bit, path);
 800         }
 801         if (read_from_stdin) {
 802                 struct strbuf buf;
 803                 strbuf_init(&buf);
 804                 while (1) {
 805                         char *path_name;
 806                         const char *p;
 807                         read_line(&buf, stdin, line_termination);
 808                         if (buf.eof)
 809                                 break;
 810                         if (line_termination && buf.buf[0] == '"')
 811                                 path_name = unquote_c_style(buf.buf, NULL);
 812                         else
 813                                 path_name = buf.buf;
 814                         p = prefix_path(prefix, prefix_length, path_name);
 815                         update_one(p, NULL, 0);
 816                         if (set_executable_bit)
 817                                 chmod_path(set_executable_bit, p);
 818                         if (p < path_name || p > path_name + strlen(path_name))
 819                                 free((char*) p);
 820                         if (path_name != buf.buf)
 821                                 free(path_name);
 822                 }
 823         }
 824
 825  finish:
 826         if (active_cache_changed) {
 827                 if (write_cache(newfd, active_cache, active_nr) ||
 828                     commit_index_file(&cache_file))
 829                         die("Unable to write new cachefile");
 830         }
 831
 832         return has_errors ? 1 : 0;
 833 }