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