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_VALID 1
  28 #define UNMARK_VALID 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_valid(const char *path)
  44 {
  45         int namelen = strlen(path);
  46         int pos = cache_name_pos(path, namelen);
  47         if (0 <= pos) {
  48                 switch (mark_valid_only) {
  49                 case MARK_VALID:
  50                         active_cache[pos]->ce_flags |= CE_VALID;
  51                         break;
  52                 case UNMARK_VALID:
  53                         active_cache[pos]->ce_flags &= ~CE_VALID;
  54                         break;
  55                 }
  56                 cache_tree_invalidate_path(active_cache_tree, path);
  57                 active_cache_changed = 1;
  58                 return 0;
  59         }
  60         return -1;
  61 }
  62
  63 static int remove_one_path(const char *path)
  64 {
  65         if (!allow_remove)
  66                 return error("%s: does not exist and --remove not passed", path);
  67         if (remove_file_from_cache(path))
  68                 return error("%s: cannot remove from the index", path);
  69         return 0;
  70 }
  71
  72 /*
  73  * Handle a path that couldn't be lstat'ed. It's either:
  74  *  - missing file (ENOENT or ENOTDIR). That's ok if we're
  75  *    supposed to be removing it and the removal actually
  76  *    succeeds.
  77  *  - permission error. That's never ok.
  78  */
  79 static int process_lstat_error(const char *path, int err)
  80 {
  81         if (err == ENOENT || err == ENOTDIR)
  82                 return remove_one_path(path);
  83         return error("lstat(\"%s\"): %s", path, strerror(errno));
  84 }
  85
  86 static int add_one_path(struct cache_entry *old, const char *path, int len, struct stat *st)
  87 {
  88         int option, size;
  89         struct cache_entry *ce;
  90
  91         /* Was the old index entry already up-to-date? */
  92         if (old && !ce_stage(old) && !ce_match_stat(old, st, 0))
  93                 return 0;
  94
  95         size = cache_entry_size(len);
  96         ce = xcalloc(1, size);
  97         memcpy(ce->name, path, len);
  98         ce->ce_flags = len;
  99         fill_stat_cache_info(ce, st);
 100         ce->ce_mode = ce_mode_from_stat(old, st->st_mode);
 101
 102         if (index_path(ce->sha1, path, st, !info_only))
 103                 return -1;
 104         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 105         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 106         if (add_cache_entry(ce, option))
 107                 return error("%s: cannot add to the index - missing --add option?", path);
 108         return 0;
 109 }
 110
 111 /*
 112  * Handle a path that was a directory. Four cases:
 113  *
 114  *  - it's already a gitlink in the index, and we keep it that
 115  *    way, and update it if we can (if we cannot find the HEAD,
 116  *    we're going to keep it unchanged in the index!)
 117  *
 118  *  - it's a *file* in the index, in which case it should be
 119  *    removed as a file if removal is allowed, since it doesn't
 120  *    exist as such any more. If removal isn't allowed, it's
 121  *    an error.
 122  *
 123  *    (NOTE! This is old and arguably fairly strange behaviour.
 124  *    We might want to make this an error unconditionally, and
 125  *    use "--force-remove" if you actually want to force removal).
 126  *
 127  *  - it used to exist as a subdirectory (ie multiple files with
 128  *    this particular prefix) in the index, in which case it's wrong
 129  *    to try to update it as a directory.
 130  *
 131  *  - it doesn't exist at all in the index, but it is a valid
 132  *    git directory, and it should be *added* as a gitlink.
 133  */
 134 static int process_directory(const char *path, int len, struct stat *st)
 135 {
 136         unsigned char sha1[20];
 137         int pos = cache_name_pos(path, len);
 138
 139         /* Exact match: file or existing gitlink */
 140         if (pos >= 0) {
 141                 struct cache_entry *ce = active_cache[pos];
 142                 if (S_ISGITLINK(ce->ce_mode)) {
 143
 144                         /* Do nothing to the index if there is no HEAD! */
 145                         if (resolve_gitlink_ref(path, "HEAD", sha1) < 0)
 146                                 return 0;
 147
 148                         return add_one_path(ce, path, len, st);
 149                 }
 150                 /* Should this be an unconditional error? */
 151                 return remove_one_path(path);
 152         }
 153
 154         /* Inexact match: is there perhaps a subdirectory match? */
 155         pos = -pos-1;
 156         while (pos < active_nr) {
 157                 struct cache_entry *ce = active_cache[pos++];
 158
 159                 if (strncmp(ce->name, path, len))
 160                         break;
 161                 if (ce->name[len] > '/')
 162                         break;
 163                 if (ce->name[len] < '/')
 164                         continue;
 165
 166                 /* Subdirectory match - error out */
 167                 return error("%s: is a directory - add individual files instead", path);
 168         }
 169
 170         /* No match - should we add it as a gitlink? */
 171         if (!resolve_gitlink_ref(path, "HEAD", sha1))
 172                 return add_one_path(NULL, path, len, st);
 173
 174         /* Error out. */
 175         return error("%s: is a directory - add files inside instead", path);
 176 }
 177
 178 /*
 179  * Process a regular file
 180  */
 181 static int process_file(const char *path, int len, struct stat *st)
 182 {
 183         int pos = cache_name_pos(path, len);
 184         struct cache_entry *ce = pos < 0 ? NULL : active_cache[pos];
 185
 186         if (ce && S_ISGITLINK(ce->ce_mode))
 187                 return error("%s is already a gitlink, not replacing", path);
 188
 189         return add_one_path(ce, path, len, st);
 190 }
 191
 192 static int process_path(const char *path)
 193 {
 194         int len;
 195         struct stat st;
 196
 197         len = strlen(path);
 198         if (has_symlink_leading_path(len, path))
 199                 return error("'%s' is beyond a symbolic link", path);
 200
 201         /*
 202          * First things first: get the stat information, to decide
 203          * what to do about the pathname!
 204          */
 205         if (lstat(path, &st) < 0)
 206                 return process_lstat_error(path, errno);
 207
 208         if (S_ISDIR(st.st_mode))
 209                 return process_directory(path, len, &st);
 210
 211         return process_file(path, len, &st);
 212 }
 213
 214 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
 215                          const char *path, int stage)
 216 {
 217         int size, len, option;
 218         struct cache_entry *ce;
 219
 220         if (!verify_path(path))
 221                 return -1;
 222
 223         len = strlen(path);
 224         size = cache_entry_size(len);
 225         ce = xcalloc(1, size);
 226
 227         hashcpy(ce->sha1, sha1);
 228         memcpy(ce->name, path, len);
 229         ce->ce_flags = create_ce_flags(len, stage);
 230         ce->ce_mode = create_ce_mode(mode);
 231         if (assume_unchanged)
 232                 ce->ce_flags |= CE_VALID;
 233         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 234         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 235         if (add_cache_entry(ce, option))
 236                 return error("%s: cannot add to the index - missing --add option?",
 237                              path);
 238         report("add '%s'", path);
 239         return 0;
 240 }
 241
 242 static void chmod_path(int flip, const char *path)
 243 {
 244         int pos;
 245         struct cache_entry *ce;
 246         unsigned int mode;
 247
 248         pos = cache_name_pos(path, strlen(path));
 249         if (pos < 0)
 250                 goto fail;
 251         ce = active_cache[pos];
 252         mode = ce->ce_mode;
 253         if (!S_ISREG(mode))
 254                 goto fail;
 255         switch (flip) {
 256         case '+':
 257                 ce->ce_mode |= 0111; break;
 258         case '-':
 259                 ce->ce_mode &= ~0111; break;
 260         default:
 261                 goto fail;
 262         }
 263         cache_tree_invalidate_path(active_cache_tree, path);
 264         active_cache_changed = 1;
 265         report("chmod %cx '%s'", flip, path);
 266         return;
 267  fail:
 268         die("git-update-index: cannot chmod %cx '%s'", flip, path);
 269 }
 270
 271 static void update_one(const char *path, const char *prefix, int prefix_length)
 272 {
 273         const char *p = prefix_path(prefix, prefix_length, path);
 274         if (!verify_path(p)) {
 275                 fprintf(stderr, "Ignoring path %s\n", path);
 276                 goto free_return;
 277         }
 278         if (mark_valid_only) {
 279                 if (mark_valid(p))
 280                         die("Unable to mark file %s", path);
 281                 goto free_return;
 282         }
 283
 284         if (force_remove) {
 285                 if (remove_file_from_cache(p))
 286                         die("git-update-index: unable to remove %s", path);
 287                 report("remove '%s'", path);
 288                 goto free_return;
 289         }
 290         if (process_path(p))
 291                 die("Unable to process path %s", path);
 292         report("add '%s'", path);
 293  free_return:
 294         if (p < path || p > path + strlen(path))
 295                 free((char*)p);
 296 }
 297
 298 static void read_index_info(int line_termination)
 299 {
 300         struct strbuf buf;
 301         struct strbuf uq;
 302
 303         strbuf_init(&buf, 0);
 304         strbuf_init(&uq, 0);
 305         while (strbuf_getline(&buf, stdin, line_termination) != EOF) {
 306                 char *ptr, *tab;
 307                 char *path_name;
 308                 unsigned char sha1[20];
 309                 unsigned int mode;
 310                 unsigned long ul;
 311                 int stage;
 312
 313                 /* This reads lines formatted in one of three formats:
 314                  *
 315                  * (1) mode         SP sha1          TAB path
 316                  * The first format is what "git-apply --index-info"
 317                  * reports, and used to reconstruct a partial tree
 318                  * that is used for phony merge base tree when falling
 319                  * back on 3-way merge.
 320                  *
 321                  * (2) mode SP type SP sha1          TAB path
 322                  * The second format is to stuff git-ls-tree output
 323                  * into the index file.
 324                  *
 325                  * (3) mode         SP sha1 SP stage TAB path
 326                  * This format is to put higher order stages into the
 327                  * index file and matches git-ls-files --stage output.
 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                 path_name = ptr;
 354                 if (line_termination && path_name[0] == '"') {
 355                         strbuf_reset(&uq);
 356                         if (unquote_c_style(&uq, path_name, NULL)) {
 357                                 die("git-update-index: bad quoting of path name");
 358                         }
 359                         path_name = uq.buf;
 360                 }
 361
 362                 if (!verify_path(path_name)) {
 363                         fprintf(stderr, "Ignoring path %s\n", path_name);
 364                         continue;
 365                 }
 366
 367                 if (!mode) {
 368                         /* mode == 0 means there is no such path -- remove */
 369                         if (remove_file_from_cache(path_name))
 370                                 die("git-update-index: unable to remove %s",
 371                                     ptr);
 372                 }
 373                 else {
 374                         /* mode ' ' sha1 '\t' name
 375                          * ptr[-1] points at tab,
 376                          * ptr[-41] is at the beginning of sha1
 377                          */
 378                         ptr[-42] = ptr[-1] = 0;
 379                         if (add_cacheinfo(mode, sha1, path_name, stage))
 380                                 die("git-update-index: unable to update %s",
 381                                     path_name);
 382                 }
 383                 continue;
 384
 385         bad_line:
 386                 die("malformed index info %s", buf.buf);
 387         }
 388         strbuf_release(&buf);
 389         strbuf_release(&uq);
 390 }
 391
 392 static const char update_index_usage[] =
 393 "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>...";
 394
 395 static unsigned char head_sha1[20];
 396 static unsigned char merge_head_sha1[20];
 397
 398 static struct cache_entry *read_one_ent(const char *which,
 399                                         unsigned char *ent, const char *path,
 400                                         int namelen, int stage)
 401 {
 402         unsigned mode;
 403         unsigned char sha1[20];
 404         int size;
 405         struct cache_entry *ce;
 406
 407         if (get_tree_entry(ent, path, sha1, &mode)) {
 408                 if (which)
 409                         error("%s: not in %s branch.", path, which);
 410                 return NULL;
 411         }
 412         if (mode == S_IFDIR) {
 413                 if (which)
 414                         error("%s: not a blob in %s branch.", path, which);
 415                 return NULL;
 416         }
 417         size = cache_entry_size(namelen);
 418         ce = xcalloc(1, size);
 419
 420         hashcpy(ce->sha1, sha1);
 421         memcpy(ce->name, path, namelen);
 422         ce->ce_flags = create_ce_flags(namelen, stage);
 423         ce->ce_mode = create_ce_mode(mode);
 424         return ce;
 425 }
 426
 427 static int unresolve_one(const char *path)
 428 {
 429         int namelen = strlen(path);
 430         int pos;
 431         int ret = 0;
 432         struct cache_entry *ce_2 = NULL, *ce_3 = NULL;
 433
 434         /* See if there is such entry in the index. */
 435         pos = cache_name_pos(path, namelen);
 436         if (pos < 0) {
 437                 /* If there isn't, either it is unmerged, or
 438                  * resolved as "removed" by mistake.  We do not
 439                  * want to do anything in the former case.
 440                  */
 441                 pos = -pos-1;
 442                 if (pos < active_nr) {
 443                         struct cache_entry *ce = active_cache[pos];
 444                         if (ce_namelen(ce) == namelen &&
 445                             !memcmp(ce->name, path, namelen)) {
 446                                 fprintf(stderr,
 447                                         "%s: skipping still unmerged path.\n",
 448                                         path);
 449                                 goto free_return;
 450                         }
 451                 }
 452         }
 453
 454         /* Grab blobs from given path from HEAD and MERGE_HEAD,
 455          * stuff HEAD version in stage #2,
 456          * stuff MERGE_HEAD version in stage #3.
 457          */
 458         ce_2 = read_one_ent("our", head_sha1, path, namelen, 2);
 459         ce_3 = read_one_ent("their", merge_head_sha1, path, namelen, 3);
 460
 461         if (!ce_2 || !ce_3) {
 462                 ret = -1;
 463                 goto free_return;
 464         }
 465         if (!hashcmp(ce_2->sha1, ce_3->sha1) &&
 466             ce_2->ce_mode == ce_3->ce_mode) {
 467                 fprintf(stderr, "%s: identical in both, skipping.\n",
 468                         path);
 469                 goto free_return;
 470         }
 471
 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, NULL);
 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, "--ignore-submodules")) {
 600                                 refresh_flags |= REFRESH_IGNORE_SUBMODULES;
 601                                 continue;
 602                         }
 603                         if (!strcmp(path, "--add")) {
 604                                 allow_add = 1;
 605                                 continue;
 606                         }
 607                         if (!strcmp(path, "--replace")) {
 608                                 allow_replace = 1;
 609                                 continue;
 610                         }
 611                         if (!strcmp(path, "--remove")) {
 612                                 allow_remove = 1;
 613                                 continue;
 614                         }
 615                         if (!strcmp(path, "--unmerged")) {
 616                                 refresh_flags |= REFRESH_UNMERGED;
 617                                 continue;
 618                         }
 619                         if (!strcmp(path, "--refresh")) {
 620                                 has_errors |= refresh_cache(refresh_flags);
 621                                 continue;
 622                         }
 623                         if (!strcmp(path, "--really-refresh")) {
 624                                 has_errors |= refresh_cache(REFRESH_REALLY | refresh_flags);
 625                                 continue;
 626                         }
 627                         if (!strcmp(path, "--cacheinfo")) {
 628                                 unsigned char sha1[20];
 629                                 unsigned int mode;
 630
 631                                 if (i+3 >= argc)
 632                                         die("git-update-index: --cacheinfo <mode> <sha1> <path>");
 633
 634                                 if (strtoul_ui(argv[i+1], 8, &mode) ||
 635                                     get_sha1_hex(argv[i+2], sha1) ||
 636                                     add_cacheinfo(mode, sha1, argv[i+3], 0))
 637                                         die("git-update-index: --cacheinfo"
 638                                             " cannot add %s", argv[i+3]);
 639                                 i += 3;
 640                                 continue;
 641                         }
 642                         if (!strcmp(path, "--chmod=-x") ||
 643                             !strcmp(path, "--chmod=+x")) {
 644                                 if (argc <= i+1)
 645                                         die("git-update-index: %s <path>", path);
 646                                 set_executable_bit = path[8];
 647                                 continue;
 648                         }
 649                         if (!strcmp(path, "--assume-unchanged")) {
 650                                 mark_valid_only = MARK_VALID;
 651                                 continue;
 652                         }
 653                         if (!strcmp(path, "--no-assume-unchanged")) {
 654                                 mark_valid_only = UNMARK_VALID;
 655                                 continue;
 656                         }
 657                         if (!strcmp(path, "--info-only")) {
 658                                 info_only = 1;
 659                                 continue;
 660                         }
 661                         if (!strcmp(path, "--force-remove")) {
 662                                 force_remove = 1;
 663                                 continue;
 664                         }
 665                         if (!strcmp(path, "-z")) {
 666                                 line_termination = 0;
 667                                 continue;
 668                         }
 669                         if (!strcmp(path, "--stdin")) {
 670                                 if (i != argc - 1)
 671                                         die("--stdin must be at the end");
 672                                 read_from_stdin = 1;
 673                                 break;
 674                         }
 675                         if (!strcmp(path, "--index-info")) {
 676                                 if (i != argc - 1)
 677                                         die("--index-info must be at the end");
 678                                 allow_add = allow_replace = allow_remove = 1;
 679                                 read_index_info(line_termination);
 680                                 break;
 681                         }
 682                         if (!strcmp(path, "--unresolve")) {
 683                                 has_errors = do_unresolve(argc - i, argv + i,
 684                                                           prefix, prefix_length);
 685                                 if (has_errors)
 686                                         active_cache_changed = 0;
 687                                 goto finish;
 688                         }
 689                         if (!strcmp(path, "--again") || !strcmp(path, "-g")) {
 690                                 has_errors = do_reupdate(argc - i, argv + i,
 691                                                          prefix, prefix_length);
 692                                 if (has_errors)
 693                                         active_cache_changed = 0;
 694                                 goto finish;
 695                         }
 696                         if (!strcmp(path, "--ignore-missing")) {
 697                                 refresh_flags |= REFRESH_IGNORE_MISSING;
 698                                 continue;
 699                         }
 700                         if (!strcmp(path, "--verbose")) {
 701                                 verbose = 1;
 702                                 continue;
 703                         }
 704                         if (!strcmp(path, "-h") || !strcmp(path, "--help"))
 705                                 usage(update_index_usage);
 706                         die("unknown option %s", path);
 707                 }
 708                 p = prefix_path(prefix, prefix_length, path);
 709                 update_one(p, NULL, 0);
 710                 if (set_executable_bit)
 711                         chmod_path(set_executable_bit, p);
 712                 if (p < path || p > path + strlen(path))
 713                         free((char*)p);
 714         }
 715         if (read_from_stdin) {
 716                 struct strbuf buf, nbuf;
 717
 718                 strbuf_init(&buf, 0);
 719                 strbuf_init(&nbuf, 0);
 720                 while (strbuf_getline(&buf, stdin, line_termination) != EOF) {
 721                         const char *p;
 722                         if (line_termination && buf.buf[0] == '"') {
 723                                 strbuf_reset(&nbuf);
 724                                 if (unquote_c_style(&nbuf, buf.buf, NULL))
 725                                         die("line is badly quoted");
 726                                 strbuf_swap(&buf, &nbuf);
 727                         }
 728                         p = prefix_path(prefix, prefix_length, buf.buf);
 729                         update_one(p, NULL, 0);
 730                         if (set_executable_bit)
 731                                 chmod_path(set_executable_bit, p);
 732                         if (p < buf.buf || p > buf.buf + buf.len)
 733                                 free((char *)p);
 734                 }
 735                 strbuf_release(&nbuf);
 736                 strbuf_release(&buf);
 737         }
 738
 739  finish:
 740         if (active_cache_changed) {
 741                 if (newfd < 0) {
 742                         if (refresh_flags & REFRESH_QUIET)
 743                                 exit(128);
 744                         die("unable to create '%s.lock': %s",
 745                             get_index_file(), strerror(lock_error));
 746                 }
 747                 if (write_cache(newfd, active_cache, active_nr) ||
 748                     commit_locked_index(lock_file))
 749                         die("Unable to write new index file");
 750         }
 751
 752         rollback_lock_file(lock_file);
 753
 754         return has_errors ? 1 : 0;
 755 }