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)
 113                 ce->ce_mode = create_ce_mode(st.st_mode);
 114         else {
 115                 /* If there is an existing entry, pick the mode bits
 116                  * from it, otherwise assume unexecutable.
 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                 int stage;
 231
 232                 /* This reads lines formatted in one of three formats:
 233                  *
 234                  * (1) mode         SP sha1          TAB path
 235                  * The first format is what "git-apply --index-info"
 236                  * reports, and used to reconstruct a partial tree
 237                  * that is used for phony merge base tree when falling
 238                  * back on 3-way merge.
 239                  *
 240                  * (2) mode SP type SP sha1          TAB path
 241                  * The second format is to stuff git-ls-tree output
 242                  * into the index file.
 243                  *
 244                  * (3) mode         SP sha1 SP stage TAB path
 245                  * This format is to put higher order stages into the
 246                  * index file and matches git-ls-files --stage output.
 247                  */
 248                 read_line(&buf, stdin, line_termination);
 249                 if (buf.eof)
 250                         break;
 251
 252                 mode = strtoul(buf.buf, &ptr, 8);
 253                 if (ptr == buf.buf || *ptr != ' ')
 254                         goto bad_line;
 255
 256                 tab = strchr(ptr, '\t');
 257                 if (!tab || tab - ptr < 41)
 258                         goto bad_line;
 259
 260                 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
 261                         stage = tab[-1] - '0';
 262                         ptr = tab + 1; /* point at the head of path */
 263                         tab = tab - 2; /* point at tail of sha1 */
 264                 }
 265                 else {
 266                         stage = 0;
 267                         ptr = tab + 1; /* point at the head of path */
 268                 }
 269
 270                 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
 271                         goto bad_line;
 272
 273                 if (line_termination && ptr[0] == '"')
 274                         path_name = unquote_c_style(ptr, NULL);
 275                 else
 276                         path_name = ptr;
 277
 278                 if (!verify_path(path_name)) {
 279                         fprintf(stderr, "Ignoring path %s\n", path_name);
 280                         if (path_name != ptr)
 281                                 free(path_name);
 282                         continue;
 283                 }
 284                 cache_tree_invalidate_path(active_cache_tree, path_name);
 285
 286                 if (!mode) {
 287                         /* mode == 0 means there is no such path -- remove */
 288                         if (remove_file_from_cache(path_name))
 289                                 die("git-update-index: unable to remove %s",
 290                                     ptr);
 291                 }
 292                 else {
 293                         /* mode ' ' sha1 '\t' name
 294                          * ptr[-1] points at tab,
 295                          * ptr[-41] is at the beginning of sha1
 296                          */
 297                         ptr[-42] = ptr[-1] = 0;
 298                         if (add_cacheinfo(mode, sha1, path_name, stage))
 299                                 die("git-update-index: unable to update %s",
 300                                     path_name);
 301                 }
 302                 if (path_name != ptr)
 303                         free(path_name);
 304                 continue;
 305
 306         bad_line:
 307                 die("malformed index info %s", buf.buf);
 308         }
 309 }
 310
 311 static const char update_index_usage[] =
 312 "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>...";
 313
 314 static unsigned char head_sha1[20];
 315 static unsigned char merge_head_sha1[20];
 316
 317 static struct cache_entry *read_one_ent(const char *which,
 318                                         unsigned char *ent, const char *path,
 319                                         int namelen, int stage)
 320 {
 321         unsigned mode;
 322         unsigned char sha1[20];
 323         int size;
 324         struct cache_entry *ce;
 325
 326         if (get_tree_entry(ent, path, sha1, &mode)) {
 327                 if (which)
 328                         error("%s: not in %s branch.", path, which);
 329                 return NULL;
 330         }
 331         if (mode == S_IFDIR) {
 332                 if (which)
 333                         error("%s: not a blob in %s branch.", path, which);
 334                 return NULL;
 335         }
 336         size = cache_entry_size(namelen);
 337         ce = xcalloc(1, size);
 338
 339         hashcpy(ce->sha1, sha1);
 340         memcpy(ce->name, path, namelen);
 341         ce->ce_flags = create_ce_flags(namelen, stage);
 342         ce->ce_mode = create_ce_mode(mode);
 343         return ce;
 344 }
 345
 346 static int unresolve_one(const char *path)
 347 {
 348         int namelen = strlen(path);
 349         int pos;
 350         int ret = 0;
 351         struct cache_entry *ce_2 = NULL, *ce_3 = NULL;
 352
 353         /* See if there is such entry in the index. */
 354         pos = cache_name_pos(path, namelen);
 355         if (pos < 0) {
 356                 /* If there isn't, either it is unmerged, or
 357                  * resolved as "removed" by mistake.  We do not
 358                  * want to do anything in the former case.
 359                  */
 360                 pos = -pos-1;
 361                 if (pos < active_nr) {
 362                         struct cache_entry *ce = active_cache[pos];
 363                         if (ce_namelen(ce) == namelen &&
 364                             !memcmp(ce->name, path, namelen)) {
 365                                 fprintf(stderr,
 366                                         "%s: skipping still unmerged path.\n",
 367                                         path);
 368                                 goto free_return;
 369                         }
 370                 }
 371         }
 372
 373         /* Grab blobs from given path from HEAD and MERGE_HEAD,
 374          * stuff HEAD version in stage #2,
 375          * stuff MERGE_HEAD version in stage #3.
 376          */
 377         ce_2 = read_one_ent("our", head_sha1, path, namelen, 2);
 378         ce_3 = read_one_ent("their", merge_head_sha1, path, namelen, 3);
 379
 380         if (!ce_2 || !ce_3) {
 381                 ret = -1;
 382                 goto free_return;
 383         }
 384         if (!hashcmp(ce_2->sha1, ce_3->sha1) &&
 385             ce_2->ce_mode == ce_3->ce_mode) {
 386                 fprintf(stderr, "%s: identical in both, skipping.\n",
 387                         path);
 388                 goto free_return;
 389         }
 390
 391         cache_tree_invalidate_path(active_cache_tree, path);
 392         remove_file_from_cache(path);
 393         if (add_cache_entry(ce_2, ADD_CACHE_OK_TO_ADD)) {
 394                 error("%s: cannot add our version to the index.", path);
 395                 ret = -1;
 396                 goto free_return;
 397         }
 398         if (!add_cache_entry(ce_3, ADD_CACHE_OK_TO_ADD))
 399                 return 0;
 400         error("%s: cannot add their version to the index.", path);
 401         ret = -1;
 402  free_return:
 403         free(ce_2);
 404         free(ce_3);
 405         return ret;
 406 }
 407
 408 static void read_head_pointers(void)
 409 {
 410         if (read_ref("HEAD", head_sha1))
 411                 die("No HEAD -- no initial commit yet?\n");
 412         if (read_ref("MERGE_HEAD", merge_head_sha1)) {
 413                 fprintf(stderr, "Not in the middle of a merge.\n");
 414                 exit(0);
 415         }
 416 }
 417
 418 static int do_unresolve(int ac, const char **av,
 419                         const char *prefix, int prefix_length)
 420 {
 421         int i;
 422         int err = 0;
 423
 424         /* Read HEAD and MERGE_HEAD; if MERGE_HEAD does not exist, we
 425          * are not doing a merge, so exit with success status.
 426          */
 427         read_head_pointers();
 428
 429         for (i = 1; i < ac; i++) {
 430                 const char *arg = av[i];
 431                 const char *p = prefix_path(prefix, prefix_length, arg);
 432                 err |= unresolve_one(p);
 433                 if (p < arg || p > arg + strlen(arg))
 434                         free((char*)p);
 435         }
 436         return err;
 437 }
 438
 439 static int do_reupdate(int ac, const char **av,
 440                        const char *prefix, int prefix_length)
 441 {
 442         /* Read HEAD and run update-index on paths that are
 443          * merged and already different between index and HEAD.
 444          */
 445         int pos;
 446         int has_head = 1;
 447         const char **pathspec = get_pathspec(prefix, av + 1);
 448
 449         if (read_ref("HEAD", head_sha1))
 450                 /* If there is no HEAD, that means it is an initial
 451                  * commit.  Update everything in the index.
 452                  */
 453                 has_head = 0;
 454  redo:
 455         for (pos = 0; pos < active_nr; pos++) {
 456                 struct cache_entry *ce = active_cache[pos];
 457                 struct cache_entry *old = NULL;
 458                 int save_nr;
 459
 460                 if (ce_stage(ce) || !ce_path_match(ce, pathspec))
 461                         continue;
 462                 if (has_head)
 463                         old = read_one_ent(NULL, head_sha1,
 464                                            ce->name, ce_namelen(ce), 0);
 465                 if (old && ce->ce_mode == old->ce_mode &&
 466                     !hashcmp(ce->sha1, old->sha1)) {
 467                         free(old);
 468                         continue; /* unchanged */
 469                 }
 470                 /* Be careful.  The working tree may not have the
 471                  * path anymore, in which case, under 'allow_remove',
 472                  * or worse yet 'allow_replace', active_nr may decrease.
 473                  */
 474                 save_nr = active_nr;
 475                 update_one(ce->name + prefix_length, prefix, prefix_length);
 476                 if (save_nr != active_nr)
 477                         goto redo;
 478         }
 479         return 0;
 480 }
 481
 482 int cmd_update_index(int argc, const char **argv, const char *prefix)
 483 {
 484         int i, newfd, entries, has_errors = 0, line_termination = '\n';
 485         int allow_options = 1;
 486         int read_from_stdin = 0;
 487         int prefix_length = prefix ? strlen(prefix) : 0;
 488         char set_executable_bit = 0;
 489         unsigned int refresh_flags = 0;
 490         struct lock_file *lock_file;
 491
 492         git_config(git_default_config);
 493
 494         /* We can't free this memory, it becomes part of a linked list parsed atexit() */
 495         lock_file = xcalloc(1, sizeof(struct lock_file));
 496
 497         newfd = hold_lock_file_for_update(lock_file, get_index_file(), 1);
 498
 499         entries = read_cache();
 500         if (entries < 0)
 501                 die("cache corrupted");
 502
 503         for (i = 1 ; i < argc; i++) {
 504                 const char *path = argv[i];
 505                 const char *p;
 506
 507                 if (allow_options && *path == '-') {
 508                         if (!strcmp(path, "--")) {
 509                                 allow_options = 0;
 510                                 continue;
 511                         }
 512                         if (!strcmp(path, "-q")) {
 513                                 refresh_flags |= REFRESH_QUIET;
 514                                 continue;
 515                         }
 516                         if (!strcmp(path, "--add")) {
 517                                 allow_add = 1;
 518                                 continue;
 519                         }
 520                         if (!strcmp(path, "--replace")) {
 521                                 allow_replace = 1;
 522                                 continue;
 523                         }
 524                         if (!strcmp(path, "--remove")) {
 525                                 allow_remove = 1;
 526                                 continue;
 527                         }
 528                         if (!strcmp(path, "--unmerged")) {
 529                                 refresh_flags |= REFRESH_UNMERGED;
 530                                 continue;
 531                         }
 532                         if (!strcmp(path, "--refresh")) {
 533                                 has_errors |= refresh_cache(refresh_flags);
 534                                 continue;
 535                         }
 536                         if (!strcmp(path, "--really-refresh")) {
 537                                 has_errors |= refresh_cache(REFRESH_REALLY | refresh_flags);
 538                                 continue;
 539                         }
 540                         if (!strcmp(path, "--cacheinfo")) {
 541                                 unsigned char sha1[20];
 542                                 unsigned int mode;
 543
 544                                 if (i+3 >= argc)
 545                                         die("git-update-index: --cacheinfo <mode> <sha1> <path>");
 546
 547                                 if ((sscanf(argv[i+1], "%o", &mode) != 1) ||
 548                                     get_sha1_hex(argv[i+2], sha1) ||
 549                                     add_cacheinfo(mode, sha1, argv[i+3], 0))
 550                                         die("git-update-index: --cacheinfo"
 551                                             " cannot add %s", argv[i+3]);
 552                                 i += 3;
 553                                 continue;
 554                         }
 555                         if (!strcmp(path, "--chmod=-x") ||
 556                             !strcmp(path, "--chmod=+x")) {
 557                                 if (argc <= i+1)
 558                                         die("git-update-index: %s <path>", path);
 559                                 set_executable_bit = path[8];
 560                                 continue;
 561                         }
 562                         if (!strcmp(path, "--assume-unchanged")) {
 563                                 mark_valid_only = MARK_VALID;
 564                                 continue;
 565                         }
 566                         if (!strcmp(path, "--no-assume-unchanged")) {
 567                                 mark_valid_only = UNMARK_VALID;
 568                                 continue;
 569                         }
 570                         if (!strcmp(path, "--info-only")) {
 571                                 info_only = 1;
 572                                 continue;
 573                         }
 574                         if (!strcmp(path, "--force-remove")) {
 575                                 force_remove = 1;
 576                                 continue;
 577                         }
 578                         if (!strcmp(path, "-z")) {
 579                                 line_termination = 0;
 580                                 continue;
 581                         }
 582                         if (!strcmp(path, "--stdin")) {
 583                                 if (i != argc - 1)
 584                                         die("--stdin must be at the end");
 585                                 read_from_stdin = 1;
 586                                 break;
 587                         }
 588                         if (!strcmp(path, "--index-info")) {
 589                                 if (i != argc - 1)
 590                                         die("--index-info must be at the end");
 591                                 allow_add = allow_replace = allow_remove = 1;
 592                                 read_index_info(line_termination);
 593                                 break;
 594                         }
 595                         if (!strcmp(path, "--unresolve")) {
 596                                 has_errors = do_unresolve(argc - i, argv + i,
 597                                                           prefix, prefix_length);
 598                                 if (has_errors)
 599                                         active_cache_changed = 0;
 600                                 goto finish;
 601                         }
 602                         if (!strcmp(path, "--again") || !strcmp(path, "-g")) {
 603                                 has_errors = do_reupdate(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, "--ignore-missing")) {
 610                                 refresh_flags |= REFRESH_IGNORE_MISSING;
 611                                 continue;
 612                         }
 613                         if (!strcmp(path, "--verbose")) {
 614                                 verbose = 1;
 615                                 continue;
 616                         }
 617                         if (!strcmp(path, "-h") || !strcmp(path, "--help"))
 618                                 usage(update_index_usage);
 619                         die("unknown option %s", path);
 620                 }
 621                 p = prefix_path(prefix, prefix_length, path);
 622                 update_one(p, NULL, 0);
 623                 if (set_executable_bit)
 624                         chmod_path(set_executable_bit, p);
 625                 if (p < path || p > path + strlen(path))
 626                         free((char*)p);
 627         }
 628         if (read_from_stdin) {
 629                 struct strbuf buf;
 630                 strbuf_init(&buf);
 631                 while (1) {
 632                         char *path_name;
 633                         const char *p;
 634                         read_line(&buf, stdin, line_termination);
 635                         if (buf.eof)
 636                                 break;
 637                         if (line_termination && buf.buf[0] == '"')
 638                                 path_name = unquote_c_style(buf.buf, NULL);
 639                         else
 640                                 path_name = buf.buf;
 641                         p = prefix_path(prefix, prefix_length, path_name);
 642                         update_one(p, NULL, 0);
 643                         if (set_executable_bit)
 644                                 chmod_path(set_executable_bit, p);
 645                         if (p < path_name || p > path_name + strlen(path_name))
 646                                 free((char*) p);
 647                         if (path_name != buf.buf)
 648                                 free(path_name);
 649                 }
 650         }
 651
 652  finish:
 653         if (active_cache_changed) {
 654                 if (write_cache(newfd, active_cache, active_nr) ||
 655                     close(newfd) || commit_lock_file(lock_file))
 656                         die("Unable to write new index file");
 657         }
 658
 659         rollback_lock_file(lock_file);
 660
 661         return has_errors ? 1 : 0;
 662 }