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 /*
 241  * We fundamentally don't like some paths: we don't want
 242  * dot or dot-dot anywhere, and for obvious reasons don't
 243  * want to recurse into ".git" either.
 244  *
 245  * Also, we don't want double slashes or slashes at the
 246  * end that can make pathnames ambiguous.
 247  */
 248 static int verify_dotfile(const char *rest)
 249 {
 250         /*
 251          * The first character was '.', but that
 252          * has already been discarded, we now test
 253          * the rest.
 254          */
 255         switch (*rest) {
 256         /* "." is not allowed */
 257         case '\0': case '/':
 258                 return 0;
 259
 260         /*
 261          * ".git" followed by  NUL or slash is bad. This
 262          * shares the path end test with the ".." case.
 263          */
 264         case 'g':
 265                 if (rest[1] != 'i')
 266                         break;
 267                 if (rest[2] != 't')
 268                         break;
 269                 rest += 2;
 270         /* fallthrough */
 271         case '.':
 272                 if (rest[1] == '\0' || rest[1] == '/')
 273                         return 0;
 274         }
 275         return 1;
 276 }
 277
 278 static int verify_path(const char *path)
 279 {
 280         char c;
 281
 282         goto inside;
 283         for (;;) {
 284                 if (!c)
 285                         return 1;
 286                 if (c == '/') {
 287 inside:
 288                         c = *path++;
 289                         switch (c) {
 290                         default:
 291                                 continue;
 292                         case '/': case '\0':
 293                                 break;
 294                         case '.':
 295                                 if (verify_dotfile(path))
 296                                         continue;
 297                         }
 298                         return 0;
 299                 }
 300                 c = *path++;
 301         }
 302 }
 303
 304 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
 305                          const char *path, int stage)
 306 {
 307         int size, len, option;
 308         struct cache_entry *ce;
 309
 310         if (!verify_path(path))
 311                 return -1;
 312
 313         len = strlen(path);
 314         size = cache_entry_size(len);
 315         ce = xcalloc(1, size);
 316
 317         memcpy(ce->sha1, sha1, 20);
 318         memcpy(ce->name, path, len);
 319         ce->ce_flags = create_ce_flags(len, stage);
 320         ce->ce_mode = create_ce_mode(mode);
 321         if (assume_unchanged)
 322                 ce->ce_flags |= htons(CE_VALID);
 323         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 324         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 325         if (add_cache_entry(ce, option))
 326                 return error("%s: cannot add to the index - missing --add option?",
 327                              path);
 328         report("add '%s'", path);
 329         return 0;
 330 }
 331
 332 static void chmod_path(int flip, const char *path)
 333 {
 334         int pos;
 335         struct cache_entry *ce;
 336         unsigned int mode;
 337
 338         pos = cache_name_pos(path, strlen(path));
 339         if (pos < 0)
 340                 goto fail;
 341         ce = active_cache[pos];
 342         mode = ntohl(ce->ce_mode);
 343         if (!S_ISREG(mode))
 344                 goto fail;
 345         switch (flip) {
 346         case '+':
 347                 ce->ce_mode |= htonl(0111); break;
 348         case '-':
 349                 ce->ce_mode &= htonl(~0111); break;
 350         default:
 351                 goto fail;
 352         }
 353         active_cache_changed = 1;
 354         report("chmod %cx '%s'", flip, path);
 355         return;
 356  fail:
 357         die("git-update-index: cannot chmod %cx '%s'", flip, path);
 358 }
 359
 360 static struct cache_file cache_file;
 361
 362 static void update_one(const char *path, const char *prefix, int prefix_length)
 363 {
 364         const char *p = prefix_path(prefix, prefix_length, path);
 365         if (!verify_path(p)) {
 366                 fprintf(stderr, "Ignoring path %s\n", path);
 367                 return;
 368         }
 369         if (mark_valid_only) {
 370                 if (mark_valid(p))
 371                         die("Unable to mark file %s", path);
 372                 return;
 373         }
 374
 375         if (force_remove) {
 376                 if (remove_file_from_cache(p))
 377                         die("git-update-index: unable to remove %s", path);
 378                 report("remove '%s'", path);
 379                 return;
 380         }
 381         if (add_file_to_cache(p))
 382                 die("Unable to process file %s", path);
 383         report("add '%s'", path);
 384 }
 385
 386 static void read_index_info(int line_termination)
 387 {
 388         struct strbuf buf;
 389         strbuf_init(&buf);
 390         while (1) {
 391                 char *ptr, *tab;
 392                 char *path_name;
 393                 unsigned char sha1[20];
 394                 unsigned int mode;
 395                 int stage;
 396
 397                 /* This reads lines formatted in one of three formats:
 398                  *
 399                  * (1) mode         SP sha1          TAB path
 400                  * The first format is what "git-apply --index-info"
 401                  * reports, and used to reconstruct a partial tree
 402                  * that is used for phony merge base tree when falling
 403                  * back on 3-way merge.
 404                  *
 405                  * (2) mode SP type SP sha1          TAB path
 406                  * The second format is to stuff git-ls-tree output
 407                  * into the index file.
 408                  *
 409                  * (3) mode         SP sha1 SP stage TAB path
 410                  * This format is to put higher order stages into the
 411                  * index file and matches git-ls-files --stage output.
 412                  */
 413                 read_line(&buf, stdin, line_termination);
 414                 if (buf.eof)
 415                         break;
 416
 417                 mode = strtoul(buf.buf, &ptr, 8);
 418                 if (ptr == buf.buf || *ptr != ' ')
 419                         goto bad_line;
 420
 421                 tab = strchr(ptr, '\t');
 422                 if (!tab || tab - ptr < 41)
 423                         goto bad_line;
 424
 425                 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
 426                         stage = tab[-1] - '0';
 427                         ptr = tab + 1; /* point at the head of path */
 428                         tab = tab - 2; /* point at tail of sha1 */
 429                 }
 430                 else {
 431                         stage = 0;
 432                         ptr = tab + 1; /* point at the head of path */
 433                 }
 434
 435                 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
 436                         goto bad_line;
 437
 438                 if (line_termination && ptr[0] == '"')
 439                         path_name = unquote_c_style(ptr, NULL);
 440                 else
 441                         path_name = ptr;
 442
 443                 if (!verify_path(path_name)) {
 444                         fprintf(stderr, "Ignoring path %s\n", path_name);
 445                         if (path_name != ptr)
 446                                 free(path_name);
 447                         continue;
 448                 }
 449
 450                 if (!mode) {
 451                         /* mode == 0 means there is no such path -- remove */
 452                         if (remove_file_from_cache(path_name))
 453                                 die("git-update-index: unable to remove %s",
 454                                     ptr);
 455                 }
 456                 else {
 457                         /* mode ' ' sha1 '\t' name
 458                          * ptr[-1] points at tab,
 459                          * ptr[-41] is at the beginning of sha1
 460                          */
 461                         ptr[-42] = ptr[-1] = 0;
 462                         if (add_cacheinfo(mode, sha1, path_name, stage))
 463                                 die("git-update-index: unable to update %s",
 464                                     path_name);
 465                 }
 466                 if (path_name != ptr)
 467                         free(path_name);
 468                 continue;
 469
 470         bad_line:
 471                 die("malformed index info %s", buf.buf);
 472         }
 473 }
 474
 475 static const char update_index_usage[] =
 476 "git-update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--really-refresh] [--cacheinfo] [--chmod=(+|-)x] [--assume-unchanged] [--info-only] [--force-remove] [--stdin] [--index-info] [--unresolve] [--ignore-missing] [-z] [--verbose] [--] <file>...";
 477
 478 static unsigned char head_sha1[20];
 479 static unsigned char merge_head_sha1[20];
 480
 481 static struct cache_entry *read_one_ent(const char *which,
 482                                         unsigned char *ent, const char *path,
 483                                         int namelen, int stage)
 484 {
 485         unsigned mode;
 486         unsigned char sha1[20];
 487         int size;
 488         struct cache_entry *ce;
 489
 490         if (get_tree_entry(ent, path, sha1, &mode)) {
 491                 error("%s: not in %s branch.", path, which);
 492                 return NULL;
 493         }
 494         if (mode == S_IFDIR) {
 495                 error("%s: not a blob in %s branch.", path, which);
 496                 return NULL;
 497         }
 498         size = cache_entry_size(namelen);
 499         ce = xcalloc(1, size);
 500
 501         memcpy(ce->sha1, sha1, 20);
 502         memcpy(ce->name, path, namelen);
 503         ce->ce_flags = create_ce_flags(namelen, stage);
 504         ce->ce_mode = create_ce_mode(mode);
 505         return ce;
 506 }
 507
 508 static int unresolve_one(const char *path)
 509 {
 510         int namelen = strlen(path);
 511         int pos;
 512         int ret = 0;
 513         struct cache_entry *ce_2 = NULL, *ce_3 = NULL;
 514
 515         /* See if there is such entry in the index. */
 516         pos = cache_name_pos(path, namelen);
 517         if (pos < 0) {
 518                 /* If there isn't, either it is unmerged, or
 519                  * resolved as "removed" by mistake.  We do not
 520                  * want to do anything in the former case.
 521                  */
 522                 pos = -pos-1;
 523                 if (pos < active_nr) {
 524                         struct cache_entry *ce = active_cache[pos];
 525                         if (ce_namelen(ce) == namelen &&
 526                             !memcmp(ce->name, path, namelen)) {
 527                                 fprintf(stderr,
 528                                         "%s: skipping still unmerged path.\n",
 529                                         path);
 530                                 goto free_return;
 531                         }
 532                 }
 533         }
 534
 535         /* Grab blobs from given path from HEAD and MERGE_HEAD,
 536          * stuff HEAD version in stage #2,
 537          * stuff MERGE_HEAD version in stage #3.
 538          */
 539         ce_2 = read_one_ent("our", head_sha1, path, namelen, 2);
 540         ce_3 = read_one_ent("their", merge_head_sha1, path, namelen, 3);
 541
 542         if (!ce_2 || !ce_3) {
 543                 ret = -1;
 544                 goto free_return;
 545         }
 546         if (!memcmp(ce_2->sha1, ce_3->sha1, 20) &&
 547             ce_2->ce_mode == ce_3->ce_mode) {
 548                 fprintf(stderr, "%s: identical in both, skipping.\n",
 549                         path);
 550                 goto free_return;
 551         }
 552
 553         remove_file_from_cache(path);
 554         if (add_cache_entry(ce_2, ADD_CACHE_OK_TO_ADD)) {
 555                 error("%s: cannot add our version to the index.", path);
 556                 ret = -1;
 557                 goto free_return;
 558         }
 559         if (!add_cache_entry(ce_3, ADD_CACHE_OK_TO_ADD))
 560                 return 0;
 561         error("%s: cannot add their version to the index.", path);
 562         ret = -1;
 563  free_return:
 564         free(ce_2);
 565         free(ce_3);
 566         return ret;
 567 }
 568
 569 static void read_head_pointers(void)
 570 {
 571         if (read_ref(git_path("HEAD"), head_sha1))
 572                 die("No HEAD -- no initial commit yet?\n");
 573         if (read_ref(git_path("MERGE_HEAD"), merge_head_sha1)) {
 574                 fprintf(stderr, "Not in the middle of a merge.\n");
 575                 exit(0);
 576         }
 577 }
 578
 579 static int do_unresolve(int ac, const char **av)
 580 {
 581         int i;
 582         int err = 0;
 583
 584         /* Read HEAD and MERGE_HEAD; if MERGE_HEAD does not exist, we
 585          * are not doing a merge, so exit with success status.
 586          */
 587         read_head_pointers();
 588
 589         for (i = 1; i < ac; i++) {
 590                 const char *arg = av[i];
 591                 err |= unresolve_one(arg);
 592         }
 593         return err;
 594 }
 595
 596 int main(int argc, const char **argv)
 597 {
 598         int i, newfd, entries, has_errors = 0, line_termination = '\n';
 599         int allow_options = 1;
 600         int read_from_stdin = 0;
 601         const char *prefix = setup_git_directory();
 602         int prefix_length = prefix ? strlen(prefix) : 0;
 603         char set_executable_bit = 0;
 604
 605         git_config(git_default_config);
 606
 607         newfd = hold_index_file_for_update(&cache_file, get_index_file());
 608         if (newfd < 0)
 609                 die("unable to create new cachefile");
 610
 611         entries = read_cache();
 612         if (entries < 0)
 613                 die("cache corrupted");
 614
 615         for (i = 1 ; i < argc; i++) {
 616                 const char *path = argv[i];
 617
 618                 if (allow_options && *path == '-') {
 619                         if (!strcmp(path, "--")) {
 620                                 allow_options = 0;
 621                                 continue;
 622                         }
 623                         if (!strcmp(path, "-q")) {
 624                                 quiet = 1;
 625                                 continue;
 626                         }
 627                         if (!strcmp(path, "--add")) {
 628                                 allow_add = 1;
 629                                 continue;
 630                         }
 631                         if (!strcmp(path, "--replace")) {
 632                                 allow_replace = 1;
 633                                 continue;
 634                         }
 635                         if (!strcmp(path, "--remove")) {
 636                                 allow_remove = 1;
 637                                 continue;
 638                         }
 639                         if (!strcmp(path, "--unmerged")) {
 640                                 allow_unmerged = 1;
 641                                 continue;
 642                         }
 643                         if (!strcmp(path, "--refresh")) {
 644                                 has_errors |= refresh_cache(0);
 645                                 continue;
 646                         }
 647                         if (!strcmp(path, "--really-refresh")) {
 648                                 has_errors |= refresh_cache(1);
 649                                 continue;
 650                         }
 651                         if (!strcmp(path, "--cacheinfo")) {
 652                                 unsigned char sha1[20];
 653                                 unsigned int mode;
 654
 655                                 if (i+3 >= argc)
 656                                         die("git-update-index: --cacheinfo <mode> <sha1> <path>");
 657
 658                                 if ((sscanf(argv[i+1], "%o", &mode) != 1) ||
 659                                     get_sha1_hex(argv[i+2], sha1) ||
 660                                     add_cacheinfo(mode, sha1, argv[i+3], 0))
 661                                         die("git-update-index: --cacheinfo"
 662                                             " cannot add %s", argv[i+3]);
 663                                 i += 3;
 664                                 continue;
 665                         }
 666                         if (!strcmp(path, "--chmod=-x") ||
 667                             !strcmp(path, "--chmod=+x")) {
 668                                 if (argc <= i+1)
 669                                         die("git-update-index: %s <path>", path);
 670                                 set_executable_bit = path[8];
 671                                 continue;
 672                         }
 673                         if (!strcmp(path, "--assume-unchanged")) {
 674                                 mark_valid_only = MARK_VALID;
 675                                 continue;
 676                         }
 677                         if (!strcmp(path, "--no-assume-unchanged")) {
 678                                 mark_valid_only = UNMARK_VALID;
 679                                 continue;
 680                         }
 681                         if (!strcmp(path, "--info-only")) {
 682                                 info_only = 1;
 683                                 continue;
 684                         }
 685                         if (!strcmp(path, "--force-remove")) {
 686                                 force_remove = 1;
 687                                 continue;
 688                         }
 689                         if (!strcmp(path, "-z")) {
 690                                 line_termination = 0;
 691                                 continue;
 692                         }
 693                         if (!strcmp(path, "--stdin")) {
 694                                 if (i != argc - 1)
 695                                         die("--stdin must be at the end");
 696                                 read_from_stdin = 1;
 697                                 break;
 698                         }
 699                         if (!strcmp(path, "--index-info")) {
 700                                 if (i != argc - 1)
 701                                         die("--index-info must be at the end");
 702                                 allow_add = allow_replace = allow_remove = 1;
 703                                 read_index_info(line_termination);
 704                                 break;
 705                         }
 706                         if (!strcmp(path, "--unresolve")) {
 707                                 has_errors = do_unresolve(argc - i, argv + i);
 708                                 if (has_errors)
 709                                         active_cache_changed = 0;
 710                                 goto finish;
 711                         }
 712                         if (!strcmp(path, "--ignore-missing")) {
 713                                 not_new = 1;
 714                                 continue;
 715                         }
 716                         if (!strcmp(path, "--verbose")) {
 717                                 verbose = 1;
 718                                 continue;
 719                         }
 720                         if (!strcmp(path, "-h") || !strcmp(path, "--help"))
 721                                 usage(update_index_usage);
 722                         die("unknown option %s", path);
 723                 }
 724                 update_one(path, prefix, prefix_length);
 725                 if (set_executable_bit)
 726                         chmod_path(set_executable_bit, path);
 727         }
 728         if (read_from_stdin) {
 729                 struct strbuf buf;
 730                 strbuf_init(&buf);
 731                 while (1) {
 732                         char *path_name;
 733                         read_line(&buf, stdin, line_termination);
 734                         if (buf.eof)
 735                                 break;
 736                         if (line_termination && buf.buf[0] == '"')
 737                                 path_name = unquote_c_style(buf.buf, NULL);
 738                         else
 739                                 path_name = buf.buf;
 740                         update_one(path_name, prefix, prefix_length);
 741                         if (set_executable_bit) {
 742                                 const char *p = prefix_path(prefix, prefix_length, path_name);
 743                                 chmod_path(set_executable_bit, p);
 744                         }
 745                         if (path_name != buf.buf)
 746                                 free(path_name);
 747                 }
 748         }
 749
 750  finish:
 751         if (active_cache_changed) {
 752                 if (write_cache(newfd, active_cache, active_nr) ||
 753                     commit_index_file(&cache_file))
 754                         die("Unable to write new cachefile");
 755         }
 756
 757         return has_errors ? 1 : 0;
 758 }