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