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