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
  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 |= htons(CE_VALID);
  51                         break;
  52                 case UNMARK_VALID:
  53                         active_cache[pos]->ce_flags &= ~htons(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 add_file_to_cache(const char *path)
  64 {
  65         int size, namelen, option, status;
  66         struct cache_entry *ce;
  67         struct stat st;
  68
  69         status = lstat(path, &st);
  70
  71         /* We probably want to do this in remove_file_from_cache() and
  72          * add_cache_entry() instead...
  73          */
  74         cache_tree_invalidate_path(active_cache_tree, path);
  75
  76         if (status < 0 || S_ISDIR(st.st_mode)) {
  77                 /* When we used to have "path" and now we want to add
  78                  * "path/file", we need a way to remove "path" before
  79                  * being able to add "path/file".  However,
  80                  * "git-update-index --remove path" would not work.
  81                  * --force-remove can be used but this is more user
  82                  * friendly, especially since we can do the opposite
  83                  * case just fine without --force-remove.
  84                  */
  85                 if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
  86                         if (allow_remove) {
  87                                 if (remove_file_from_cache(path))
  88                                         return error("%s: cannot remove from the index",
  89                                                      path);
  90                                 else
  91                                         return 0;
  92                         } else if (status < 0) {
  93                                 return error("%s: does not exist and --remove not passed",
  94                                              path);
  95                         }
  96                 }
  97                 if (0 == status)
  98                         return error("%s: is a directory - add files inside instead",
  99                                      path);
 100                 else
 101                         return error("lstat(\"%s\"): %s", path,
 102                                      strerror(errno));
 103         }
 104
 105         namelen = strlen(path);
 106         size = cache_entry_size(namelen);
 107         ce = xcalloc(1, size);
 108         memcpy(ce->name, path, namelen);
 109         ce->ce_flags = htons(namelen);
 110         fill_stat_cache_info(ce, &st);
 111
 112         if (trust_executable_bit && has_symlinks)
 113                 ce->ce_mode = create_ce_mode(st.st_mode);
 114         else {
 115                 /* If there is an existing entry, pick the mode bits and type
 116                  * from it, otherwise assume unexecutable regular file.
 117                  */
 118                 struct cache_entry *ent;
 119                 int pos = cache_name_pos(path, namelen);
 120
 121                 ent = (0 <= pos) ? active_cache[pos] : NULL;
 122                 ce->ce_mode = ce_mode_from_stat(ent, st.st_mode);
 123         }
 124
 125         if (index_path(ce->sha1, path, &st, !info_only))
 126                 return -1;
 127         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 128         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 129         if (add_cache_entry(ce, option))
 130                 return error("%s: cannot add to the index - missing --add option?",
 131                              path);
 132         return 0;
 133 }
 134
 135 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
 136                          const char *path, int stage)
 137 {
 138         int size, len, option;
 139         struct cache_entry *ce;
 140
 141         if (!verify_path(path))
 142                 return -1;
 143
 144         len = strlen(path);
 145         size = cache_entry_size(len);
 146         ce = xcalloc(1, size);
 147
 148         hashcpy(ce->sha1, sha1);
 149         memcpy(ce->name, path, len);
 150         ce->ce_flags = create_ce_flags(len, stage);
 151         ce->ce_mode = create_ce_mode(mode);
 152         if (assume_unchanged)
 153                 ce->ce_flags |= htons(CE_VALID);
 154         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 155         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 156         if (add_cache_entry(ce, option))
 157                 return error("%s: cannot add to the index - missing --add option?",
 158                              path);
 159         report("add '%s'", path);
 160         cache_tree_invalidate_path(active_cache_tree, path);
 161         return 0;
 162 }
 163
 164 static void chmod_path(int flip, const char *path)
 165 {
 166         int pos;
 167         struct cache_entry *ce;
 168         unsigned int mode;
 169
 170         pos = cache_name_pos(path, strlen(path));
 171         if (pos < 0)
 172                 goto fail;
 173         ce = active_cache[pos];
 174         mode = ntohl(ce->ce_mode);
 175         if (!S_ISREG(mode))
 176                 goto fail;
 177         switch (flip) {
 178         case '+':
 179                 ce->ce_mode |= htonl(0111); break;
 180         case '-':
 181                 ce->ce_mode &= htonl(~0111); break;
 182         default:
 183                 goto fail;
 184         }
 185         cache_tree_invalidate_path(active_cache_tree, path);
 186         active_cache_changed = 1;
 187         report("chmod %cx '%s'", flip, path);
 188         return;
 189  fail:
 190         die("git-update-index: cannot chmod %cx '%s'", flip, path);
 191 }
 192
 193 static void update_one(const char *path, const char *prefix, int prefix_length)
 194 {
 195         const char *p = prefix_path(prefix, prefix_length, path);
 196         if (!verify_path(p)) {
 197                 fprintf(stderr, "Ignoring path %s\n", path);
 198                 goto free_return;
 199         }
 200         if (mark_valid_only) {
 201                 if (mark_valid(p))
 202                         die("Unable to mark file %s", path);
 203                 goto free_return;
 204         }
 205         cache_tree_invalidate_path(active_cache_tree, path);
 206
 207         if (force_remove) {
 208                 if (remove_file_from_cache(p))
 209                         die("git-update-index: unable to remove %s", path);
 210                 report("remove '%s'", path);
 211                 goto free_return;
 212         }
 213         if (add_file_to_cache(p))
 214                 die("Unable to process file %s", path);
 215         report("add '%s'", path);
 216  free_return:
 217         if (p < path || p > path + strlen(path))
 218                 free((char*)p);
 219 }
 220
 221 static void read_index_info(int line_termination)
 222 {
 223         struct strbuf buf;
 224         strbuf_init(&buf);
 225         while (1) {
 226                 char *ptr, *tab;
 227                 char *path_name;
 228                 unsigned char sha1[20];
 229                 unsigned int mode;
 230                 unsigned long ul;
 231                 int stage;
 232
 233                 /* This reads lines formatted in one of three formats:
 234                  *
 235                  * (1) mode         SP sha1          TAB path
 236                  * The first format is what "git-apply --index-info"
 237                  * reports, and used to reconstruct a partial tree
 238                  * that is used for phony merge base tree when falling
 239                  * back on 3-way merge.
 240                  *
 241                  * (2) mode SP type SP sha1          TAB path
 242                  * The second format is to stuff git-ls-tree output
 243                  * into the index file.
 244                  *
 245                  * (3) mode         SP sha1 SP stage TAB path
 246                  * This format is to put higher order stages into the
 247                  * index file and matches git-ls-files --stage output.
 248                  */
 249                 read_line(&buf, stdin, line_termination);
 250                 if (buf.eof)
 251                         break;
 252
 253                 errno = 0;
 254                 ul = strtoul(buf.buf, &ptr, 8);
 255                 if (ptr == buf.buf || *ptr != ' '
 256                     || errno || (unsigned int) ul != ul)
 257                         goto bad_line;
 258                 mode = ul;
 259
 260                 tab = strchr(ptr, '\t');
 261                 if (!tab || tab - ptr < 41)
 262                         goto bad_line;
 263
 264                 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
 265                         stage = tab[-1] - '0';
 266                         ptr = tab + 1; /* point at the head of path */
 267                         tab = tab - 2; /* point at tail of sha1 */
 268                 }
 269                 else {
 270                         stage = 0;
 271                         ptr = tab + 1; /* point at the head of path */
 272                 }
 273
 274                 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
 275                         goto bad_line;
 276
 277                 if (line_termination && ptr[0] == '"')
 278                         path_name = unquote_c_style(ptr, NULL);
 279                 else
 280                         path_name = ptr;
 281
 282                 if (!verify_path(path_name)) {
 283                         fprintf(stderr, "Ignoring path %s\n", path_name);
 284                         if (path_name != ptr)
 285                                 free(path_name);
 286                         continue;
 287                 }
 288                 cache_tree_invalidate_path(active_cache_tree, path_name);
 289
 290                 if (!mode) {
 291                         /* mode == 0 means there is no such path -- remove */
 292                         if (remove_file_from_cache(path_name))
 293                                 die("git-update-index: unable to remove %s",
 294                                     ptr);
 295                 }
 296                 else {
 297                         /* mode ' ' sha1 '\t' name
 298                          * ptr[-1] points at tab,
 299                          * ptr[-41] is at the beginning of sha1
 300                          */
 301                         ptr[-42] = ptr[-1] = 0;
 302                         if (add_cacheinfo(mode, sha1, path_name, stage))
 303                                 die("git-update-index: unable to update %s",
 304                                     path_name);
 305                 }
 306                 if (path_name != ptr)
 307                         free(path_name);
 308                 continue;
 309
 310         bad_line:
 311                 die("malformed index info %s", buf.buf);
 312         }
 313 }
 314
 315 static const char update_index_usage[] =
 316 "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>...";
 317
 318 static unsigned char head_sha1[20];
 319 static unsigned char merge_head_sha1[20];
 320
 321 static struct cache_entry *read_one_ent(const char *which,
 322                                         unsigned char *ent, const char *path,
 323                                         int namelen, int stage)
 324 {
 325         unsigned mode;
 326         unsigned char sha1[20];
 327         int size;
 328         struct cache_entry *ce;
 329
 330         if (get_tree_entry(ent, path, sha1, &mode)) {
 331                 if (which)
 332                         error("%s: not in %s branch.", path, which);
 333                 return NULL;
 334         }
 335         if (mode == S_IFDIR) {
 336                 if (which)
 337                         error("%s: not a blob in %s branch.", path, which);
 338                 return NULL;
 339         }
 340         size = cache_entry_size(namelen);
 341         ce = xcalloc(1, size);
 342
 343         hashcpy(ce->sha1, sha1);
 344         memcpy(ce->name, path, namelen);
 345         ce->ce_flags = create_ce_flags(namelen, stage);
 346         ce->ce_mode = create_ce_mode(mode);
 347         return ce;
 348 }
 349
 350 static int unresolve_one(const char *path)
 351 {
 352         int namelen = strlen(path);
 353         int pos;
 354         int ret = 0;
 355         struct cache_entry *ce_2 = NULL, *ce_3 = NULL;
 356
 357         /* See if there is such entry in the index. */
 358         pos = cache_name_pos(path, namelen);
 359         if (pos < 0) {
 360                 /* If there isn't, either it is unmerged, or
 361                  * resolved as "removed" by mistake.  We do not
 362                  * want to do anything in the former case.
 363                  */
 364                 pos = -pos-1;
 365                 if (pos < active_nr) {
 366                         struct cache_entry *ce = active_cache[pos];
 367                         if (ce_namelen(ce) == namelen &&
 368                             !memcmp(ce->name, path, namelen)) {
 369                                 fprintf(stderr,
 370                                         "%s: skipping still unmerged path.\n",
 371                                         path);
 372                                 goto free_return;
 373                         }
 374                 }
 375         }
 376
 377         /* Grab blobs from given path from HEAD and MERGE_HEAD,
 378          * stuff HEAD version in stage #2,
 379          * stuff MERGE_HEAD version in stage #3.
 380          */
 381         ce_2 = read_one_ent("our", head_sha1, path, namelen, 2);
 382         ce_3 = read_one_ent("their", merge_head_sha1, path, namelen, 3);
 383
 384         if (!ce_2 || !ce_3) {
 385                 ret = -1;
 386                 goto free_return;
 387         }
 388         if (!hashcmp(ce_2->sha1, ce_3->sha1) &&
 389             ce_2->ce_mode == ce_3->ce_mode) {
 390                 fprintf(stderr, "%s: identical in both, skipping.\n",
 391                         path);
 392                 goto free_return;
 393         }
 394
 395         cache_tree_invalidate_path(active_cache_tree, path);
 396         remove_file_from_cache(path);
 397         if (add_cache_entry(ce_2, ADD_CACHE_OK_TO_ADD)) {
 398                 error("%s: cannot add our version to the index.", path);
 399                 ret = -1;
 400                 goto free_return;
 401         }
 402         if (!add_cache_entry(ce_3, ADD_CACHE_OK_TO_ADD))
 403                 return 0;
 404         error("%s: cannot add their version to the index.", path);
 405         ret = -1;
 406  free_return:
 407         free(ce_2);
 408         free(ce_3);
 409         return ret;
 410 }
 411
 412 static void read_head_pointers(void)
 413 {
 414         if (read_ref("HEAD", head_sha1))
 415                 die("No HEAD -- no initial commit yet?\n");
 416         if (read_ref("MERGE_HEAD", merge_head_sha1)) {
 417                 fprintf(stderr, "Not in the middle of a merge.\n");
 418                 exit(0);
 419         }
 420 }
 421
 422 static int do_unresolve(int ac, const char **av,
 423                         const char *prefix, int prefix_length)
 424 {
 425         int i;
 426         int err = 0;
 427
 428         /* Read HEAD and MERGE_HEAD; if MERGE_HEAD does not exist, we
 429          * are not doing a merge, so exit with success status.
 430          */
 431         read_head_pointers();
 432
 433         for (i = 1; i < ac; i++) {
 434                 const char *arg = av[i];
 435                 const char *p = prefix_path(prefix, prefix_length, arg);
 436                 err |= unresolve_one(p);
 437                 if (p < arg || p > arg + strlen(arg))
 438                         free((char*)p);
 439         }
 440         return err;
 441 }
 442
 443 static int do_reupdate(int ac, const char **av,
 444                        const char *prefix, int prefix_length)
 445 {
 446         /* Read HEAD and run update-index on paths that are
 447          * merged and already different between index and HEAD.
 448          */
 449         int pos;
 450         int has_head = 1;
 451         const char **pathspec = get_pathspec(prefix, av + 1);
 452
 453         if (read_ref("HEAD", head_sha1))
 454                 /* If there is no HEAD, that means it is an initial
 455                  * commit.  Update everything in the index.
 456                  */
 457                 has_head = 0;
 458  redo:
 459         for (pos = 0; pos < active_nr; pos++) {
 460                 struct cache_entry *ce = active_cache[pos];
 461                 struct cache_entry *old = NULL;
 462                 int save_nr;
 463
 464                 if (ce_stage(ce) || !ce_path_match(ce, pathspec))
 465                         continue;
 466                 if (has_head)
 467                         old = read_one_ent(NULL, head_sha1,
 468                                            ce->name, ce_namelen(ce), 0);
 469                 if (old && ce->ce_mode == old->ce_mode &&
 470                     !hashcmp(ce->sha1, old->sha1)) {
 471                         free(old);
 472                         continue; /* unchanged */
 473                 }
 474                 /* Be careful.  The working tree may not have the
 475                  * path anymore, in which case, under 'allow_remove',
 476                  * or worse yet 'allow_replace', active_nr may decrease.
 477                  */
 478                 save_nr = active_nr;
 479                 update_one(ce->name + prefix_length, prefix, prefix_length);
 480                 if (save_nr != active_nr)
 481                         goto redo;
 482         }
 483         return 0;
 484 }
 485
 486 int cmd_update_index(int argc, const char **argv, const char *prefix)
 487 {
 488         int i, newfd, entries, has_errors = 0, line_termination = '\n';
 489         int allow_options = 1;
 490         int read_from_stdin = 0;
 491         int prefix_length = prefix ? strlen(prefix) : 0;
 492         char set_executable_bit = 0;
 493         unsigned int refresh_flags = 0;
 494         int lock_error = 0;
 495         struct lock_file *lock_file;
 496
 497         git_config(git_default_config);
 498
 499         /* We can't free this memory, it becomes part of a linked list parsed atexit() */
 500         lock_file = xcalloc(1, sizeof(struct lock_file));
 501
 502         newfd = hold_lock_file_for_update(lock_file, get_index_file(), 0);
 503         if (newfd < 0)
 504                 lock_error = errno;
 505
 506         entries = read_cache();
 507         if (entries < 0)
 508                 die("cache corrupted");
 509
 510         for (i = 1 ; i < argc; i++) {
 511                 const char *path = argv[i];
 512                 const char *p;
 513
 514                 if (allow_options && *path == '-') {
 515                         if (!strcmp(path, "--")) {
 516                                 allow_options = 0;
 517                                 continue;
 518                         }
 519                         if (!strcmp(path, "-q")) {
 520                                 refresh_flags |= REFRESH_QUIET;
 521                                 continue;
 522                         }
 523                         if (!strcmp(path, "--add")) {
 524                                 allow_add = 1;
 525                                 continue;
 526                         }
 527                         if (!strcmp(path, "--replace")) {
 528                                 allow_replace = 1;
 529                                 continue;
 530                         }
 531                         if (!strcmp(path, "--remove")) {
 532                                 allow_remove = 1;
 533                                 continue;
 534                         }
 535                         if (!strcmp(path, "--unmerged")) {
 536                                 refresh_flags |= REFRESH_UNMERGED;
 537                                 continue;
 538                         }
 539                         if (!strcmp(path, "--refresh")) {
 540                                 has_errors |= refresh_cache(refresh_flags);
 541                                 continue;
 542                         }
 543                         if (!strcmp(path, "--really-refresh")) {
 544                                 has_errors |= refresh_cache(REFRESH_REALLY | refresh_flags);
 545                                 continue;
 546                         }
 547                         if (!strcmp(path, "--cacheinfo")) {
 548                                 unsigned char sha1[20];
 549                                 unsigned int mode;
 550
 551                                 if (i+3 >= argc)
 552                                         die("git-update-index: --cacheinfo <mode> <sha1> <path>");
 553
 554                                 if ((strtoul_ui(argv[i+1], 8, &mode) != 1) ||
 555                                     get_sha1_hex(argv[i+2], sha1) ||
 556                                     add_cacheinfo(mode, sha1, argv[i+3], 0))
 557                                         die("git-update-index: --cacheinfo"
 558                                             " cannot add %s", argv[i+3]);
 559                                 i += 3;
 560                                 continue;
 561                         }
 562                         if (!strcmp(path, "--chmod=-x") ||
 563                             !strcmp(path, "--chmod=+x")) {
 564                                 if (argc <= i+1)
 565                                         die("git-update-index: %s <path>", path);
 566                                 set_executable_bit = path[8];
 567                                 continue;
 568                         }
 569                         if (!strcmp(path, "--assume-unchanged")) {
 570                                 mark_valid_only = MARK_VALID;
 571                                 continue;
 572                         }
 573                         if (!strcmp(path, "--no-assume-unchanged")) {
 574                                 mark_valid_only = UNMARK_VALID;
 575                                 continue;
 576                         }
 577                         if (!strcmp(path, "--info-only")) {
 578                                 info_only = 1;
 579                                 continue;
 580                         }
 581                         if (!strcmp(path, "--force-remove")) {
 582                                 force_remove = 1;
 583                                 continue;
 584                         }
 585                         if (!strcmp(path, "-z")) {
 586                                 line_termination = 0;
 587                                 continue;
 588                         }
 589                         if (!strcmp(path, "--stdin")) {
 590                                 if (i != argc - 1)
 591                                         die("--stdin must be at the end");
 592                                 read_from_stdin = 1;
 593                                 break;
 594                         }
 595                         if (!strcmp(path, "--index-info")) {
 596                                 if (i != argc - 1)
 597                                         die("--index-info must be at the end");
 598                                 allow_add = allow_replace = allow_remove = 1;
 599                                 read_index_info(line_termination);
 600                                 break;
 601                         }
 602                         if (!strcmp(path, "--unresolve")) {
 603                                 has_errors = do_unresolve(argc - i, argv + i,
 604                                                           prefix, prefix_length);
 605                                 if (has_errors)
 606                                         active_cache_changed = 0;
 607                                 goto finish;
 608                         }
 609                         if (!strcmp(path, "--again") || !strcmp(path, "-g")) {
 610                                 has_errors = do_reupdate(argc - i, argv + i,
 611                                                          prefix, prefix_length);
 612                                 if (has_errors)
 613                                         active_cache_changed = 0;
 614                                 goto finish;
 615                         }
 616                         if (!strcmp(path, "--ignore-missing")) {
 617                                 refresh_flags |= REFRESH_IGNORE_MISSING;
 618                                 continue;
 619                         }
 620                         if (!strcmp(path, "--verbose")) {
 621                                 verbose = 1;
 622                                 continue;
 623                         }
 624                         if (!strcmp(path, "-h") || !strcmp(path, "--help"))
 625                                 usage(update_index_usage);
 626                         die("unknown option %s", path);
 627                 }
 628                 p = prefix_path(prefix, prefix_length, path);
 629                 update_one(p, NULL, 0);
 630                 if (set_executable_bit)
 631                         chmod_path(set_executable_bit, p);
 632                 if (p < path || p > path + strlen(path))
 633                         free((char*)p);
 634         }
 635         if (read_from_stdin) {
 636                 struct strbuf buf;
 637                 strbuf_init(&buf);
 638                 while (1) {
 639                         char *path_name;
 640                         const char *p;
 641                         read_line(&buf, stdin, line_termination);
 642                         if (buf.eof)
 643                                 break;
 644                         if (line_termination && buf.buf[0] == '"')
 645                                 path_name = unquote_c_style(buf.buf, NULL);
 646                         else
 647                                 path_name = buf.buf;
 648                         p = prefix_path(prefix, prefix_length, path_name);
 649                         update_one(p, NULL, 0);
 650                         if (set_executable_bit)
 651                                 chmod_path(set_executable_bit, p);
 652                         if (p < path_name || p > path_name + strlen(path_name))
 653                                 free((char*) p);
 654                         if (path_name != buf.buf)
 655                                 free(path_name);
 656                 }
 657         }
 658
 659  finish:
 660         if (active_cache_changed) {
 661                 if (newfd < 0) {
 662                         if (refresh_flags & REFRESH_QUIET)
 663                                 exit(128);
 664                         die("unable to create '%s.lock': %s",
 665                             get_index_file(), strerror(lock_error));
 666                 }
 667                 if (write_cache(newfd, active_cache, active_nr) ||
 668                     close(newfd) || commit_lock_file(lock_file))
 669                         die("Unable to write new index file");
 670         }
 671
 672         rollback_lock_file(lock_file);
 673
 674         return has_errors ? 1 : 0;
 675 }