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