git.oblomov.eu Git - git/blob - builtin-update-index.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7 #include "strbuf.h"
   8 #include "quote.h"
   9 #include "cache-tree.h"
  10 #include "tree-walk.h"
  11 #include "builtin.h"
  12 #include "refs.h"
  13
  14 /*
  15  * Default to not allowing changes to the list of files. The
  16  * tool doesn't actually care, but this makes it harder to add
  17  * files to the revision control by mistake by doing something
  18  * like "git-update-index *" and suddenly having all the object
  19  * files be revision controlled.
  20  */
  21 static int allow_add;
  22 static int allow_remove;
  23 static int allow_replace;
  24 static int info_only;
  25 static int force_remove;
  26 static int verbose;
  27 static int mark_valid_only;
  28 #define MARK_VALID 1
  29 #define UNMARK_VALID 2
  30
  31 static void report(const char *fmt, ...)
  32 {
  33         va_list vp;
  34
  35         if (!verbose)
  36                 return;
  37
  38         va_start(vp, fmt);
  39         vprintf(fmt, vp);
  40         putchar('\n');
  41         va_end(vp);
  42 }
  43
  44 static int mark_valid(const char *path)
  45 {
  46         int namelen = strlen(path);
  47         int pos = cache_name_pos(path, namelen);
  48         if (0 <= pos) {
  49                 switch (mark_valid_only) {
  50                 case MARK_VALID:
  51                         active_cache[pos]->ce_flags |= htons(CE_VALID);
  52                         break;
  53                 case UNMARK_VALID:
  54                         active_cache[pos]->ce_flags &= ~htons(CE_VALID);
  55                         break;
  56                 }
  57                 cache_tree_invalidate_path(active_cache_tree, path);
  58                 active_cache_changed = 1;
  59                 return 0;
  60         }
  61         return -1;
  62 }
  63
  64 static int remove_one_path(const char *path)
  65 {
  66         if (!allow_remove)
  67                 return error("%s: does not exist and --remove not passed", path);
  68         if (remove_file_from_cache(path))
  69                 return error("%s: cannot remove from the index", path);
  70         return 0;
  71 }
  72
  73 /*
  74  * Handle a path that couldn't be lstat'ed. It's either:
  75  *  - missing file (ENOENT or ENOTDIR). That's ok if we're
  76  *    supposed to be removing it and the removal actually
  77  *    succeeds.
  78  *  - permission error. That's never ok.
  79  */
  80 static int process_lstat_error(const char *path, int err)
  81 {
  82         if (err == ENOENT || err == ENOTDIR)
  83                 return remove_one_path(path);
  84         return error("lstat(\"%s\"): %s", path, strerror(errno));
  85 }
  86
  87 static int add_one_path(struct cache_entry *old, const char *path, int len, struct stat *st)
  88 {
  89         int option, size = cache_entry_size(len);
  90         struct cache_entry *ce = xcalloc(1, size);
  91
  92         memcpy(ce->name, path, len);
  93         ce->ce_flags = htons(len);
  94         fill_stat_cache_info(ce, st);
  95         ce->ce_mode = ce_mode_from_stat(old, st->st_mode);
  96
  97         if (index_path(ce->sha1, path, st, !info_only))
  98                 return -1;
  99         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 100         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 101         if (add_cache_entry(ce, option))
 102                 return error("%s: cannot add to the index - missing --add option?", path);
 103         return 0;
 104 }
 105
 106 /*
 107  * Handle a path that was a directory. Four cases:
 108  *
 109  *  - it's already a gitlink in the index, and we keep it that
 110  *    way, and update it if we can (if we cannot find the HEAD,
 111  *    we're going to keep it unchanged in the index!)
 112  *
 113  *  - it's a *file* in the index, in which case it should be
 114  *    removed as a file if removal is allowed, since it doesn't
 115  *    exist as such any more. If removal isn't allowed, it's
 116  *    an error.
 117  *
 118  *    (NOTE! This is old and arguably fairly strange behaviour.
 119  *    We might want to make this an error unconditionally, and
 120  *    use "--force-remove" if you actually want to force removal).
 121  *
 122  *  - it used to exist as a subdirectory (ie multiple files with
 123  *    this particular prefix) in the index, in which case it's wrong
 124  *    to try to update it as a directory.
 125  *
 126  *  - it doesn't exist at all in the index, but it is a valid
 127  *    git directory, and it should be *added* as a gitlink.
 128  */
 129 static int process_directory(const char *path, int len, struct stat *st)
 130 {
 131         unsigned char sha1[20];
 132         int pos = cache_name_pos(path, len);
 133
 134         /* Exact match: file or existing gitlink */
 135         if (pos >= 0) {
 136                 struct cache_entry *ce = active_cache[pos];
 137                 if (S_ISDIRLNK(ntohl(ce->ce_mode))) {
 138
 139                         /* Do nothing to the index if there is no HEAD! */
 140                         if (resolve_gitlink_ref(path, "HEAD", sha1) < 0)
 141                                 return 0;
 142
 143                         return add_one_path(ce, path, len, st);
 144                 }
 145                 /* Should this be an unconditional error? */
 146                 return remove_one_path(path);
 147         }
 148
 149         /* Inexact match: is there perhaps a subdirectory match? */
 150         pos = -pos-1;
 151         while (pos < active_nr) {
 152                 struct cache_entry *ce = active_cache[pos++];
 153
 154                 if (strncmp(ce->name, path, len))
 155                         break;
 156                 if (ce->name[len] > '/')
 157                         break;
 158                 if (ce->name[len] < '/')
 159                         continue;
 160
 161                 /* Subdirectory match - error out */
 162                 return error("%s: is a directory - add individual files instead", path);
 163         }
 164
 165         /* No match - should we add it as a gitlink? */
 166         if (!resolve_gitlink_ref(path, "HEAD", sha1))
 167                 return add_one_path(NULL, path, len, st);
 168
 169         /* Error out. */
 170         return error("%s: is a directory - add files inside instead", path);
 171 }
 172
 173 /*
 174  * Process a regular file
 175  */
 176 static int process_file(const char *path, int len, struct stat *st)
 177 {
 178         int pos = cache_name_pos(path, len);
 179         struct cache_entry *ce = pos < 0 ? NULL : active_cache[pos];
 180
 181         if (ce && S_ISDIRLNK(ntohl(ce->ce_mode)))
 182                 return error("%s is already a gitlink, not replacing", path);
 183
 184         return add_one_path(ce, path, len, st);
 185 }
 186
 187 static int process_path(const char *path)
 188 {
 189         int len;
 190         struct stat st;
 191
 192         /* We probably want to do this in remove_file_from_cache() and
 193          * add_cache_entry() instead...
 194          */
 195         cache_tree_invalidate_path(active_cache_tree, path);
 196
 197         /*
 198          * First things first: get the stat information, to decide
 199          * what to do about the pathname!
 200          */
 201         if (lstat(path, &st) < 0)
 202                 return process_lstat_error(path, errno);
 203
 204         len = strlen(path);
 205         if (S_ISDIR(st.st_mode))
 206                 return process_directory(path, len, &st);
 207
 208         return process_file(path, len, &st);
 209 }
 210
 211 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
 212                          const char *path, int stage)
 213 {
 214         int size, len, option;
 215         struct cache_entry *ce;
 216
 217         if (!verify_path(path))
 218                 return -1;
 219
 220         len = strlen(path);
 221         size = cache_entry_size(len);
 222         ce = xcalloc(1, size);
 223
 224         hashcpy(ce->sha1, sha1);
 225         memcpy(ce->name, path, len);
 226         ce->ce_flags = create_ce_flags(len, stage);
 227         ce->ce_mode = create_ce_mode(mode);
 228         if (assume_unchanged)
 229                 ce->ce_flags |= htons(CE_VALID);
 230         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 231         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 232         if (add_cache_entry(ce, option))
 233                 return error("%s: cannot add to the index - missing --add option?",
 234                              path);
 235         report("add '%s'", path);
 236         cache_tree_invalidate_path(active_cache_tree, path);
 237         return 0;
 238 }
 239
 240 static void chmod_path(int flip, const char *path)
 241 {
 242         int pos;
 243         struct cache_entry *ce;
 244         unsigned int mode;
 245
 246         pos = cache_name_pos(path, strlen(path));
 247         if (pos < 0)
 248                 goto fail;
 249         ce = active_cache[pos];
 250         mode = ntohl(ce->ce_mode);
 251         if (!S_ISREG(mode))
 252                 goto fail;
 253         switch (flip) {
 254         case '+':
 255                 ce->ce_mode |= htonl(0111); break;
 256         case '-':
 257                 ce->ce_mode &= htonl(~0111); break;
 258         default:
 259                 goto fail;
 260         }
 261         cache_tree_invalidate_path(active_cache_tree, path);
 262         active_cache_changed = 1;
 263         report("chmod %cx '%s'", flip, path);
 264         return;
 265  fail:
 266         die("git-update-index: cannot chmod %cx '%s'", flip, path);
 267 }
 268
 269 static void update_one(const char *path, const char *prefix, int prefix_length)
 270 {
 271         const char *p = prefix_path(prefix, prefix_length, path);
 272         if (!verify_path(p)) {
 273                 fprintf(stderr, "Ignoring path %s\n", path);
 274                 goto free_return;
 275         }
 276         if (mark_valid_only) {
 277                 if (mark_valid(p))
 278                         die("Unable to mark file %s", path);
 279                 goto free_return;
 280         }
 281         cache_tree_invalidate_path(active_cache_tree, path);
 282
 283         if (force_remove) {
 284                 if (remove_file_from_cache(p))
 285                         die("git-update-index: unable to remove %s", path);
 286                 report("remove '%s'", path);
 287                 goto free_return;
 288         }
 289         if (process_path(p))
 290                 die("Unable to process path %s", path);
 291         report("add '%s'", path);
 292  free_return:
 293         if (p < path || p > path + strlen(path))
 294                 free((char*)p);
 295 }
 296
 297 static void read_index_info(int line_termination)
 298 {
 299         struct strbuf buf;
 300         strbuf_init(&buf);
 301         while (1) {
 302                 char *ptr, *tab;
 303                 char *path_name;
 304                 unsigned char sha1[20];
 305                 unsigned int mode;
 306                 unsigned long ul;
 307                 int stage;
 308
 309                 /* This reads lines formatted in one of three formats:
 310                  *
 311                  * (1) mode         SP sha1          TAB path
 312                  * The first format is what "git-apply --index-info"
 313                  * reports, and used to reconstruct a partial tree
 314                  * that is used for phony merge base tree when falling
 315                  * back on 3-way merge.
 316                  *
 317                  * (2) mode SP type SP sha1          TAB path
 318                  * The second format is to stuff git-ls-tree output
 319                  * into the index file.
 320                  *
 321                  * (3) mode         SP sha1 SP stage TAB path
 322                  * This format is to put higher order stages into the
 323                  * index file and matches git-ls-files --stage output.
 324                  */
 325                 read_line(&buf, stdin, line_termination);
 326                 if (buf.eof)
 327                         break;
 328
 329                 errno = 0;
 330                 ul = strtoul(buf.buf, &ptr, 8);
 331                 if (ptr == buf.buf || *ptr != ' '
 332                     || errno || (unsigned int) ul != ul)
 333                         goto bad_line;
 334                 mode = ul;
 335
 336                 tab = strchr(ptr, '\t');
 337                 if (!tab || tab - ptr < 41)
 338                         goto bad_line;
 339
 340                 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
 341                         stage = tab[-1] - '0';
 342                         ptr = tab + 1; /* point at the head of path */
 343                         tab = tab - 2; /* point at tail of sha1 */
 344                 }
 345                 else {
 346                         stage = 0;
 347                         ptr = tab + 1; /* point at the head of path */
 348                 }
 349
 350                 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
 351                         goto bad_line;
 352
 353                 if (line_termination && ptr[0] == '"')
 354                         path_name = unquote_c_style(ptr, NULL);
 355                 else
 356                         path_name = ptr;
 357
 358                 if (!verify_path(path_name)) {
 359                         fprintf(stderr, "Ignoring path %s\n", path_name);
 360                         if (path_name != ptr)
 361                                 free(path_name);
 362                         continue;
 363                 }
 364                 cache_tree_invalidate_path(active_cache_tree, path_name);
 365
 366                 if (!mode) {
 367                         /* mode == 0 means there is no such path -- remove */
 368                         if (remove_file_from_cache(path_name))
 369                                 die("git-update-index: unable to remove %s",
 370                                     ptr);
 371                 }
 372                 else {
 373                         /* mode ' ' sha1 '\t' name
 374                          * ptr[-1] points at tab,
 375                          * ptr[-41] is at the beginning of sha1
 376                          */
 377                         ptr[-42] = ptr[-1] = 0;
 378                         if (add_cacheinfo(mode, sha1, path_name, stage))
 379                                 die("git-update-index: unable to update %s",
 380                                     path_name);
 381                 }
 382                 if (path_name != ptr)
 383                         free(path_name);
 384                 continue;
 385
 386         bad_line:
 387                 die("malformed index info %s", buf.buf);
 388         }
 389 }
 390
 391 static const char update_index_usage[] =
 392 "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 | -g] [--ignore-missing] [-z] [--verbose] [--] <file>...";
 393
 394 static unsigned char head_sha1[20];
 395 static unsigned char merge_head_sha1[20];
 396
 397 static struct cache_entry *read_one_ent(const char *which,
 398                                         unsigned char *ent, const char *path,
 399                                         int namelen, int stage)
 400 {
 401         unsigned mode;
 402         unsigned char sha1[20];
 403         int size;
 404         struct cache_entry *ce;
 405
 406         if (get_tree_entry(ent, path, sha1, &mode)) {
 407                 if (which)
 408                         error("%s: not in %s branch.", path, which);
 409                 return NULL;
 410         }
 411         if (mode == S_IFDIR) {
 412                 if (which)
 413                         error("%s: not a blob in %s branch.", path, which);
 414                 return NULL;
 415         }
 416         size = cache_entry_size(namelen);
 417         ce = xcalloc(1, size);
 418
 419         hashcpy(ce->sha1, sha1);
 420         memcpy(ce->name, path, namelen);
 421         ce->ce_flags = create_ce_flags(namelen, stage);
 422         ce->ce_mode = create_ce_mode(mode);
 423         return ce;
 424 }
 425
 426 static int unresolve_one(const char *path)
 427 {
 428         int namelen = strlen(path);
 429         int pos;
 430         int ret = 0;
 431         struct cache_entry *ce_2 = NULL, *ce_3 = NULL;
 432
 433         /* See if there is such entry in the index. */
 434         pos = cache_name_pos(path, namelen);
 435         if (pos < 0) {
 436                 /* If there isn't, either it is unmerged, or
 437                  * resolved as "removed" by mistake.  We do not
 438                  * want to do anything in the former case.
 439                  */
 440                 pos = -pos-1;
 441                 if (pos < active_nr) {
 442                         struct cache_entry *ce = active_cache[pos];
 443                         if (ce_namelen(ce) == namelen &&
 444                             !memcmp(ce->name, path, namelen)) {
 445                                 fprintf(stderr,
 446                                         "%s: skipping still unmerged path.\n",
 447                                         path);
 448                                 goto free_return;
 449                         }
 450                 }
 451         }
 452
 453         /* Grab blobs from given path from HEAD and MERGE_HEAD,
 454          * stuff HEAD version in stage #2,
 455          * stuff MERGE_HEAD version in stage #3.
 456          */
 457         ce_2 = read_one_ent("our", head_sha1, path, namelen, 2);
 458         ce_3 = read_one_ent("their", merge_head_sha1, path, namelen, 3);
 459
 460         if (!ce_2 || !ce_3) {
 461                 ret = -1;
 462                 goto free_return;
 463         }
 464         if (!hashcmp(ce_2->sha1, ce_3->sha1) &&
 465             ce_2->ce_mode == ce_3->ce_mode) {
 466                 fprintf(stderr, "%s: identical in both, skipping.\n",
 467                         path);
 468                 goto free_return;
 469         }
 470
 471         cache_tree_invalidate_path(active_cache_tree, path);
 472         remove_file_from_cache(path);
 473         if (add_cache_entry(ce_2, ADD_CACHE_OK_TO_ADD)) {
 474                 error("%s: cannot add our version to the index.", path);
 475                 ret = -1;
 476                 goto free_return;
 477         }
 478         if (!add_cache_entry(ce_3, ADD_CACHE_OK_TO_ADD))
 479                 return 0;
 480         error("%s: cannot add their version to the index.", path);
 481         ret = -1;
 482  free_return:
 483         free(ce_2);
 484         free(ce_3);
 485         return ret;
 486 }
 487
 488 static void read_head_pointers(void)
 489 {
 490         if (read_ref("HEAD", head_sha1))
 491                 die("No HEAD -- no initial commit yet?\n");
 492         if (read_ref("MERGE_HEAD", merge_head_sha1)) {
 493                 fprintf(stderr, "Not in the middle of a merge.\n");
 494                 exit(0);
 495         }
 496 }
 497
 498 static int do_unresolve(int ac, const char **av,
 499                         const char *prefix, int prefix_length)
 500 {
 501         int i;
 502         int err = 0;
 503
 504         /* Read HEAD and MERGE_HEAD; if MERGE_HEAD does not exist, we
 505          * are not doing a merge, so exit with success status.
 506          */
 507         read_head_pointers();
 508
 509         for (i = 1; i < ac; i++) {
 510                 const char *arg = av[i];
 511                 const char *p = prefix_path(prefix, prefix_length, arg);
 512                 err |= unresolve_one(p);
 513                 if (p < arg || p > arg + strlen(arg))
 514                         free((char*)p);
 515         }
 516         return err;
 517 }
 518
 519 static int do_reupdate(int ac, const char **av,
 520                        const char *prefix, int prefix_length)
 521 {
 522         /* Read HEAD and run update-index on paths that are
 523          * merged and already different between index and HEAD.
 524          */
 525         int pos;
 526         int has_head = 1;
 527         const char **pathspec = get_pathspec(prefix, av + 1);
 528
 529         if (read_ref("HEAD", head_sha1))
 530                 /* If there is no HEAD, that means it is an initial
 531                  * commit.  Update everything in the index.
 532                  */
 533                 has_head = 0;
 534  redo:
 535         for (pos = 0; pos < active_nr; pos++) {
 536                 struct cache_entry *ce = active_cache[pos];
 537                 struct cache_entry *old = NULL;
 538                 int save_nr;
 539
 540                 if (ce_stage(ce) || !ce_path_match(ce, pathspec))
 541                         continue;
 542                 if (has_head)
 543                         old = read_one_ent(NULL, head_sha1,
 544                                            ce->name, ce_namelen(ce), 0);
 545                 if (old && ce->ce_mode == old->ce_mode &&
 546                     !hashcmp(ce->sha1, old->sha1)) {
 547                         free(old);
 548                         continue; /* unchanged */
 549                 }
 550                 /* Be careful.  The working tree may not have the
 551                  * path anymore, in which case, under 'allow_remove',
 552                  * or worse yet 'allow_replace', active_nr may decrease.
 553                  */
 554                 save_nr = active_nr;
 555                 update_one(ce->name + prefix_length, prefix, prefix_length);
 556                 if (save_nr != active_nr)
 557                         goto redo;
 558         }
 559         return 0;
 560 }
 561
 562 int cmd_update_index(int argc, const char **argv, const char *prefix)
 563 {
 564         int i, newfd, entries, has_errors = 0, line_termination = '\n';
 565         int allow_options = 1;
 566         int read_from_stdin = 0;
 567         int prefix_length = prefix ? strlen(prefix) : 0;
 568         char set_executable_bit = 0;
 569         unsigned int refresh_flags = 0;
 570         int lock_error = 0;
 571         struct lock_file *lock_file;
 572
 573         git_config(git_default_config);
 574
 575         /* We can't free this memory, it becomes part of a linked list parsed atexit() */
 576         lock_file = xcalloc(1, sizeof(struct lock_file));
 577
 578         newfd = hold_locked_index(lock_file, 0);
 579         if (newfd < 0)
 580                 lock_error = errno;
 581
 582         entries = read_cache();
 583         if (entries < 0)
 584                 die("cache corrupted");
 585
 586         for (i = 1 ; i < argc; i++) {
 587                 const char *path = argv[i];
 588                 const char *p;
 589
 590                 if (allow_options && *path == '-') {
 591                         if (!strcmp(path, "--")) {
 592                                 allow_options = 0;
 593                                 continue;
 594                         }
 595                         if (!strcmp(path, "-q")) {
 596                                 refresh_flags |= REFRESH_QUIET;
 597                                 continue;
 598                         }
 599                         if (!strcmp(path, "--add")) {
 600                                 allow_add = 1;
 601                                 continue;
 602                         }
 603                         if (!strcmp(path, "--replace")) {
 604                                 allow_replace = 1;
 605                                 continue;
 606                         }
 607                         if (!strcmp(path, "--remove")) {
 608                                 allow_remove = 1;
 609                                 continue;
 610                         }
 611                         if (!strcmp(path, "--unmerged")) {
 612                                 refresh_flags |= REFRESH_UNMERGED;
 613                                 continue;
 614                         }
 615                         if (!strcmp(path, "--refresh")) {
 616                                 has_errors |= refresh_cache(refresh_flags);
 617                                 continue;
 618                         }
 619                         if (!strcmp(path, "--really-refresh")) {
 620                                 has_errors |= refresh_cache(REFRESH_REALLY | refresh_flags);
 621                                 continue;
 622                         }
 623                         if (!strcmp(path, "--cacheinfo")) {
 624                                 unsigned char sha1[20];
 625                                 unsigned int mode;
 626
 627                                 if (i+3 >= argc)
 628                                         die("git-update-index: --cacheinfo <mode> <sha1> <path>");
 629
 630                                 if (strtoul_ui(argv[i+1], 8, &mode) ||
 631                                     get_sha1_hex(argv[i+2], sha1) ||
 632                                     add_cacheinfo(mode, sha1, argv[i+3], 0))
 633                                         die("git-update-index: --cacheinfo"
 634                                             " cannot add %s", argv[i+3]);
 635                                 i += 3;
 636                                 continue;
 637                         }
 638                         if (!strcmp(path, "--chmod=-x") ||
 639                             !strcmp(path, "--chmod=+x")) {
 640                                 if (argc <= i+1)
 641                                         die("git-update-index: %s <path>", path);
 642                                 set_executable_bit = path[8];
 643                                 continue;
 644                         }
 645                         if (!strcmp(path, "--assume-unchanged")) {
 646                                 mark_valid_only = MARK_VALID;
 647                                 continue;
 648                         }
 649                         if (!strcmp(path, "--no-assume-unchanged")) {
 650                                 mark_valid_only = UNMARK_VALID;
 651                                 continue;
 652                         }
 653                         if (!strcmp(path, "--info-only")) {
 654                                 info_only = 1;
 655                                 continue;
 656                         }
 657                         if (!strcmp(path, "--force-remove")) {
 658                                 force_remove = 1;
 659                                 continue;
 660                         }
 661                         if (!strcmp(path, "-z")) {
 662                                 line_termination = 0;
 663                                 continue;
 664                         }
 665                         if (!strcmp(path, "--stdin")) {
 666                                 if (i != argc - 1)
 667                                         die("--stdin must be at the end");
 668                                 read_from_stdin = 1;
 669                                 break;
 670                         }
 671                         if (!strcmp(path, "--index-info")) {
 672                                 if (i != argc - 1)
 673                                         die("--index-info must be at the end");
 674                                 allow_add = allow_replace = allow_remove = 1;
 675                                 read_index_info(line_termination);
 676                                 break;
 677                         }
 678                         if (!strcmp(path, "--unresolve")) {
 679                                 has_errors = do_unresolve(argc - i, argv + i,
 680                                                           prefix, prefix_length);
 681                                 if (has_errors)
 682                                         active_cache_changed = 0;
 683                                 goto finish;
 684                         }
 685                         if (!strcmp(path, "--again") || !strcmp(path, "-g")) {
 686                                 has_errors = do_reupdate(argc - i, argv + i,
 687                                                          prefix, prefix_length);
 688                                 if (has_errors)
 689                                         active_cache_changed = 0;
 690                                 goto finish;
 691                         }
 692                         if (!strcmp(path, "--ignore-missing")) {
 693                                 refresh_flags |= REFRESH_IGNORE_MISSING;
 694                                 continue;
 695                         }
 696                         if (!strcmp(path, "--verbose")) {
 697                                 verbose = 1;
 698                                 continue;
 699                         }
 700                         if (!strcmp(path, "-h") || !strcmp(path, "--help"))
 701                                 usage(update_index_usage);
 702                         die("unknown option %s", path);
 703                 }
 704                 p = prefix_path(prefix, prefix_length, path);
 705                 update_one(p, NULL, 0);
 706                 if (set_executable_bit)
 707                         chmod_path(set_executable_bit, p);
 708                 if (p < path || p > path + strlen(path))
 709                         free((char*)p);
 710         }
 711         if (read_from_stdin) {
 712                 struct strbuf buf;
 713                 strbuf_init(&buf);
 714                 while (1) {
 715                         char *path_name;
 716                         const char *p;
 717                         read_line(&buf, stdin, line_termination);
 718                         if (buf.eof)
 719                                 break;
 720                         if (line_termination && buf.buf[0] == '"')
 721                                 path_name = unquote_c_style(buf.buf, NULL);
 722                         else
 723                                 path_name = buf.buf;
 724                         p = prefix_path(prefix, prefix_length, path_name);
 725                         update_one(p, NULL, 0);
 726                         if (set_executable_bit)
 727                                 chmod_path(set_executable_bit, p);
 728                         if (p < path_name || p > path_name + strlen(path_name))
 729                                 free((char*) p);
 730                         if (path_name != buf.buf)
 731                                 free(path_name);
 732                 }
 733         }
 734
 735  finish:
 736         if (active_cache_changed) {
 737                 if (newfd < 0) {
 738                         if (refresh_flags & REFRESH_QUIET)
 739                                 exit(128);
 740                         die("unable to create '%s.lock': %s",
 741                             get_index_file(), strerror(lock_error));
 742                 }
 743                 if (write_cache(newfd, active_cache, active_nr) ||
 744                     close(newfd) || commit_locked_index(lock_file))
 745                         die("Unable to write new index file");
 746         }
 747
 748         rollback_lock_file(lock_file);
 749
 750         return has_errors ? 1 : 0;
 751 }