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
  12 /*
  13  * Default to not allowing changes to the list of files. The
  14  * tool doesn't actually care, but this makes it harder to add
  15  * files to the revision control by mistake by doing something
  16  * like "git-update-index *" and suddenly having all the object
  17  * files be revision controlled.
  18  */
  19 static int allow_add;
  20 static int allow_remove;
  21 static int allow_replace;
  22 static int info_only;
  23 static int force_remove;
  24 static int verbose;
  25 static int mark_valid_only = 0;
  26 #define MARK_VALID 1
  27 #define UNMARK_VALID 2
  28
  29 static void report(const char *fmt, ...)
  30 {
  31         va_list vp;
  32
  33         if (!verbose)
  34                 return;
  35
  36         va_start(vp, fmt);
  37         vprintf(fmt, vp);
  38         putchar('\n');
  39         va_end(vp);
  40 }
  41
  42 static int mark_valid(const char *path)
  43 {
  44         int namelen = strlen(path);
  45         int pos = cache_name_pos(path, namelen);
  46         if (0 <= pos) {
  47                 switch (mark_valid_only) {
  48                 case MARK_VALID:
  49                         active_cache[pos]->ce_flags |= htons(CE_VALID);
  50                         break;
  51                 case UNMARK_VALID:
  52                         active_cache[pos]->ce_flags &= ~htons(CE_VALID);
  53                         break;
  54                 }
  55                 cache_tree_invalidate_path(active_cache_tree, path);
  56                 active_cache_changed = 1;
  57                 return 0;
  58         }
  59         return -1;
  60 }
  61
  62 static int add_file_to_cache(const char *path)
  63 {
  64         int size, namelen, option, status;
  65         struct cache_entry *ce;
  66         struct stat st;
  67
  68         status = lstat(path, &st);
  69
  70         /* We probably want to do this in remove_file_from_cache() and
  71          * add_cache_entry() instead...
  72          */
  73         cache_tree_invalidate_path(active_cache_tree, path);
  74
  75         if (status < 0 || S_ISDIR(st.st_mode)) {
  76                 /* When we used to have "path" and now we want to add
  77                  * "path/file", we need a way to remove "path" before
  78                  * being able to add "path/file".  However,
  79                  * "git-update-index --remove path" would not work.
  80                  * --force-remove can be used but this is more user
  81                  * friendly, especially since we can do the opposite
  82                  * case just fine without --force-remove.
  83                  */
  84                 if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
  85                         if (allow_remove) {
  86                                 if (remove_file_from_cache(path))
  87                                         return error("%s: cannot remove from the index",
  88                                                      path);
  89                                 else
  90                                         return 0;
  91                         } else if (status < 0) {
  92                                 return error("%s: does not exist and --remove not passed",
  93                                              path);
  94                         }
  95                 }
  96                 if (0 == status)
  97                         return error("%s: is a directory - add files inside instead",
  98                                      path);
  99                 else
 100                         return error("lstat(\"%s\"): %s", path,
 101                                      strerror(errno));
 102         }
 103
 104         namelen = strlen(path);
 105         size = cache_entry_size(namelen);
 106         ce = xcalloc(1, size);
 107         memcpy(ce->name, path, namelen);
 108         ce->ce_flags = htons(namelen);
 109         fill_stat_cache_info(ce, &st);
 110
 111         ce->ce_mode = create_ce_mode(st.st_mode);
 112         if (!trust_executable_bit) {
 113                 /* If there is an existing entry, pick the mode bits
 114                  * from it.
 115                  */
 116                 int pos = cache_name_pos(path, namelen);
 117                 if (0 <= pos)
 118                         ce->ce_mode = active_cache[pos]->ce_mode;
 119         }
 120
 121         if (index_path(ce->sha1, path, &st, !info_only))
 122                 return -1;
 123         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 124         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 125         if (add_cache_entry(ce, option))
 126                 return error("%s: cannot add to the index - missing --add option?",
 127                              path);
 128         return 0;
 129 }
 130
 131 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
 132                          const char *path, int stage)
 133 {
 134         int size, len, option;
 135         struct cache_entry *ce;
 136
 137         if (!verify_path(path))
 138                 return -1;
 139
 140         len = strlen(path);
 141         size = cache_entry_size(len);
 142         ce = xcalloc(1, size);
 143
 144         memcpy(ce->sha1, sha1, 20);
 145         memcpy(ce->name, path, len);
 146         ce->ce_flags = create_ce_flags(len, stage);
 147         ce->ce_mode = create_ce_mode(mode);
 148         if (assume_unchanged)
 149                 ce->ce_flags |= htons(CE_VALID);
 150         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 151         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 152         if (add_cache_entry(ce, option))
 153                 return error("%s: cannot add to the index - missing --add option?",
 154                              path);
 155         report("add '%s'", path);
 156         cache_tree_invalidate_path(active_cache_tree, path);
 157         return 0;
 158 }
 159
 160 static void chmod_path(int flip, const char *path)
 161 {
 162         int pos;
 163         struct cache_entry *ce;
 164         unsigned int mode;
 165
 166         pos = cache_name_pos(path, strlen(path));
 167         if (pos < 0)
 168                 goto fail;
 169         ce = active_cache[pos];
 170         mode = ntohl(ce->ce_mode);
 171         if (!S_ISREG(mode))
 172                 goto fail;
 173         switch (flip) {
 174         case '+':
 175                 ce->ce_mode |= htonl(0111); break;
 176         case '-':
 177                 ce->ce_mode &= htonl(~0111); break;
 178         default:
 179                 goto fail;
 180         }
 181         cache_tree_invalidate_path(active_cache_tree, path);
 182         active_cache_changed = 1;
 183         report("chmod %cx '%s'", flip, path);
 184         return;
 185  fail:
 186         die("git-update-index: cannot chmod %cx '%s'", flip, path);
 187 }
 188
 189 static struct lock_file lock_file;
 190
 191 static void update_one(const char *path, const char *prefix, int prefix_length)
 192 {
 193         const char *p = prefix_path(prefix, prefix_length, path);
 194         if (!verify_path(p)) {
 195                 fprintf(stderr, "Ignoring path %s\n", path);
 196                 goto free_return;
 197         }
 198         if (mark_valid_only) {
 199                 if (mark_valid(p))
 200                         die("Unable to mark file %s", path);
 201                 goto free_return;
 202         }
 203         cache_tree_invalidate_path(active_cache_tree, path);
 204
 205         if (force_remove) {
 206                 if (remove_file_from_cache(p))
 207                         die("git-update-index: unable to remove %s", path);
 208                 report("remove '%s'", path);
 209                 goto free_return;
 210         }
 211         if (add_file_to_cache(p))
 212                 die("Unable to process file %s", path);
 213         report("add '%s'", path);
 214  free_return:
 215         if (p < path || p > path + strlen(path))
 216                 free((char*)p);
 217 }
 218
 219 static void read_index_info(int line_termination)
 220 {
 221         struct strbuf buf;
 222         strbuf_init(&buf);
 223         while (1) {
 224                 char *ptr, *tab;
 225                 char *path_name;
 226                 unsigned char sha1[20];
 227                 unsigned int mode;
 228                 int stage;
 229
 230                 /* This reads lines formatted in one of three formats:
 231                  *
 232                  * (1) mode         SP sha1          TAB path
 233                  * The first format is what "git-apply --index-info"
 234                  * reports, and used to reconstruct a partial tree
 235                  * that is used for phony merge base tree when falling
 236                  * back on 3-way merge.
 237                  *
 238                  * (2) mode SP type SP sha1          TAB path
 239                  * The second format is to stuff git-ls-tree output
 240                  * into the index file.
 241                  *
 242                  * (3) mode         SP sha1 SP stage TAB path
 243                  * This format is to put higher order stages into the
 244                  * index file and matches git-ls-files --stage output.
 245                  */
 246                 read_line(&buf, stdin, line_termination);
 247                 if (buf.eof)
 248                         break;
 249
 250                 mode = strtoul(buf.buf, &ptr, 8);
 251                 if (ptr == buf.buf || *ptr != ' ')
 252                         goto bad_line;
 253
 254                 tab = strchr(ptr, '\t');
 255                 if (!tab || tab - ptr < 41)
 256                         goto bad_line;
 257
 258                 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
 259                         stage = tab[-1] - '0';
 260                         ptr = tab + 1; /* point at the head of path */
 261                         tab = tab - 2; /* point at tail of sha1 */
 262                 }
 263                 else {
 264                         stage = 0;
 265                         ptr = tab + 1; /* point at the head of path */
 266                 }
 267
 268                 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
 269                         goto bad_line;
 270
 271                 if (line_termination && ptr[0] == '"')
 272                         path_name = unquote_c_style(ptr, NULL);
 273                 else
 274                         path_name = ptr;
 275
 276                 if (!verify_path(path_name)) {
 277                         fprintf(stderr, "Ignoring path %s\n", path_name);
 278                         if (path_name != ptr)
 279                                 free(path_name);
 280                         continue;
 281                 }
 282                 cache_tree_invalidate_path(active_cache_tree, path_name);
 283
 284                 if (!mode) {
 285                         /* mode == 0 means there is no such path -- remove */
 286                         if (remove_file_from_cache(path_name))
 287                                 die("git-update-index: unable to remove %s",
 288                                     ptr);
 289                 }
 290                 else {
 291                         /* mode ' ' sha1 '\t' name
 292                          * ptr[-1] points at tab,
 293                          * ptr[-41] is at the beginning of sha1
 294                          */
 295                         ptr[-42] = ptr[-1] = 0;
 296                         if (add_cacheinfo(mode, sha1, path_name, stage))
 297                                 die("git-update-index: unable to update %s",
 298                                     path_name);
 299                 }
 300                 if (path_name != ptr)
 301                         free(path_name);
 302                 continue;
 303
 304         bad_line:
 305                 die("malformed index info %s", buf.buf);
 306         }
 307 }
 308
 309 static const char update_index_usage[] =
 310 "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>...";
 311
 312 static unsigned char head_sha1[20];
 313 static unsigned char merge_head_sha1[20];
 314
 315 static struct cache_entry *read_one_ent(const char *which,
 316                                         unsigned char *ent, const char *path,
 317                                         int namelen, int stage)
 318 {
 319         unsigned mode;
 320         unsigned char sha1[20];
 321         int size;
 322         struct cache_entry *ce;
 323
 324         if (get_tree_entry(ent, path, sha1, &mode)) {
 325                 if (which)
 326                         error("%s: not in %s branch.", path, which);
 327                 return NULL;
 328         }
 329         if (mode == S_IFDIR) {
 330                 if (which)
 331                         error("%s: not a blob in %s branch.", path, which);
 332                 return NULL;
 333         }
 334         size = cache_entry_size(namelen);
 335         ce = xcalloc(1, size);
 336
 337         memcpy(ce->sha1, sha1, 20);
 338         memcpy(ce->name, path, namelen);
 339         ce->ce_flags = create_ce_flags(namelen, stage);
 340         ce->ce_mode = create_ce_mode(mode);
 341         return ce;
 342 }
 343
 344 static int unresolve_one(const char *path)
 345 {
 346         int namelen = strlen(path);
 347         int pos;
 348         int ret = 0;
 349         struct cache_entry *ce_2 = NULL, *ce_3 = NULL;
 350
 351         /* See if there is such entry in the index. */
 352         pos = cache_name_pos(path, namelen);
 353         if (pos < 0) {
 354                 /* If there isn't, either it is unmerged, or
 355                  * resolved as "removed" by mistake.  We do not
 356                  * want to do anything in the former case.
 357                  */
 358                 pos = -pos-1;
 359                 if (pos < active_nr) {
 360                         struct cache_entry *ce = active_cache[pos];
 361                         if (ce_namelen(ce) == namelen &&
 362                             !memcmp(ce->name, path, namelen)) {
 363                                 fprintf(stderr,
 364                                         "%s: skipping still unmerged path.\n",
 365                                         path);
 366                                 goto free_return;
 367                         }
 368                 }
 369         }
 370
 371         /* Grab blobs from given path from HEAD and MERGE_HEAD,
 372          * stuff HEAD version in stage #2,
 373          * stuff MERGE_HEAD version in stage #3.
 374          */
 375         ce_2 = read_one_ent("our", head_sha1, path, namelen, 2);
 376         ce_3 = read_one_ent("their", merge_head_sha1, path, namelen, 3);
 377
 378         if (!ce_2 || !ce_3) {
 379                 ret = -1;
 380                 goto free_return;
 381         }
 382         if (!memcmp(ce_2->sha1, ce_3->sha1, 20) &&
 383             ce_2->ce_mode == ce_3->ce_mode) {
 384                 fprintf(stderr, "%s: identical in both, skipping.\n",
 385                         path);
 386                 goto free_return;
 387         }
 388
 389         cache_tree_invalidate_path(active_cache_tree, path);
 390         remove_file_from_cache(path);
 391         if (add_cache_entry(ce_2, ADD_CACHE_OK_TO_ADD)) {
 392                 error("%s: cannot add our version to the index.", path);
 393                 ret = -1;
 394                 goto free_return;
 395         }
 396         if (!add_cache_entry(ce_3, ADD_CACHE_OK_TO_ADD))
 397                 return 0;
 398         error("%s: cannot add their version to the index.", path);
 399         ret = -1;
 400  free_return:
 401         free(ce_2);
 402         free(ce_3);
 403         return ret;
 404 }
 405
 406 static void read_head_pointers(void)
 407 {
 408         if (read_ref(git_path("HEAD"), head_sha1))
 409                 die("No HEAD -- no initial commit yet?\n");
 410         if (read_ref(git_path("MERGE_HEAD"), merge_head_sha1)) {
 411                 fprintf(stderr, "Not in the middle of a merge.\n");
 412                 exit(0);
 413         }
 414 }
 415
 416 static int do_unresolve(int ac, const char **av,
 417                         const char *prefix, int prefix_length)
 418 {
 419         int i;
 420         int err = 0;
 421
 422         /* Read HEAD and MERGE_HEAD; if MERGE_HEAD does not exist, we
 423          * are not doing a merge, so exit with success status.
 424          */
 425         read_head_pointers();
 426
 427         for (i = 1; i < ac; i++) {
 428                 const char *arg = av[i];
 429                 const char *p = prefix_path(prefix, prefix_length, arg);
 430                 err |= unresolve_one(p);
 431                 if (p < arg || p > arg + strlen(arg))
 432                         free((char*)p);
 433         }
 434         return err;
 435 }
 436
 437 static int do_reupdate(int ac, const char **av,
 438                        const char *prefix, int prefix_length)
 439 {
 440         /* Read HEAD and run update-index on paths that are
 441          * merged and already different between index and HEAD.
 442          */
 443         int pos;
 444         int has_head = 1;
 445         const char **pathspec = get_pathspec(prefix, av + 1);
 446
 447         if (read_ref(git_path("HEAD"), head_sha1))
 448                 /* If there is no HEAD, that means it is an initial
 449                  * commit.  Update everything in the index.
 450                  */
 451                 has_head = 0;
 452  redo:
 453         for (pos = 0; pos < active_nr; pos++) {
 454                 struct cache_entry *ce = active_cache[pos];
 455                 struct cache_entry *old = NULL;
 456                 int save_nr;
 457
 458                 if (ce_stage(ce) || !ce_path_match(ce, pathspec))
 459                         continue;
 460                 if (has_head)
 461                         old = read_one_ent(NULL, head_sha1,
 462                                            ce->name, ce_namelen(ce), 0);
 463                 if (old && ce->ce_mode == old->ce_mode &&
 464                     !memcmp(ce->sha1, old->sha1, 20)) {
 465                         free(old);
 466                         continue; /* unchanged */
 467                 }
 468                 /* Be careful.  The working tree may not have the
 469                  * path anymore, in which case, under 'allow_remove',
 470                  * or worse yet 'allow_replace', active_nr may decrease.
 471                  */
 472                 save_nr = active_nr;
 473                 update_one(ce->name + prefix_length, prefix, prefix_length);
 474                 if (save_nr != active_nr)
 475                         goto redo;
 476         }
 477         return 0;
 478 }
 479
 480 int main(int argc, const char **argv)
 481 {
 482         int i, newfd, entries, has_errors = 0, line_termination = '\n';
 483         int allow_options = 1;
 484         int read_from_stdin = 0;
 485         const char *prefix = setup_git_directory();
 486         int prefix_length = prefix ? strlen(prefix) : 0;
 487         char set_executable_bit = 0;
 488         unsigned int refresh_flags = 0;
 489
 490         git_config(git_default_config);
 491
 492         newfd = hold_lock_file_for_update(&lock_file, get_index_file());
 493         if (newfd < 0)
 494                 die("unable to create new index file");
 495
 496         entries = read_cache();
 497         if (entries < 0)
 498                 die("cache corrupted");
 499
 500         for (i = 1 ; i < argc; i++) {
 501                 const char *path = argv[i];
 502
 503                 if (allow_options && *path == '-') {
 504                         if (!strcmp(path, "--")) {
 505                                 allow_options = 0;
 506                                 continue;
 507                         }
 508                         if (!strcmp(path, "-q")) {
 509                                 refresh_flags |= REFRESH_QUIET;
 510                                 continue;
 511                         }
 512                         if (!strcmp(path, "--add")) {
 513                                 allow_add = 1;
 514                                 continue;
 515                         }
 516                         if (!strcmp(path, "--replace")) {
 517                                 allow_replace = 1;
 518                                 continue;
 519                         }
 520                         if (!strcmp(path, "--remove")) {
 521                                 allow_remove = 1;
 522                                 continue;
 523                         }
 524                         if (!strcmp(path, "--unmerged")) {
 525                                 refresh_flags |= REFRESH_UNMERGED;
 526                                 continue;
 527                         }
 528                         if (!strcmp(path, "--refresh")) {
 529                                 has_errors |= refresh_cache(refresh_flags);
 530                                 continue;
 531                         }
 532                         if (!strcmp(path, "--really-refresh")) {
 533                                 has_errors |= refresh_cache(REFRESH_REALLY | refresh_flags);
 534                                 continue;
 535                         }
 536                         if (!strcmp(path, "--cacheinfo")) {
 537                                 unsigned char sha1[20];
 538                                 unsigned int mode;
 539
 540                                 if (i+3 >= argc)
 541                                         die("git-update-index: --cacheinfo <mode> <sha1> <path>");
 542
 543                                 if ((sscanf(argv[i+1], "%o", &mode) != 1) ||
 544                                     get_sha1_hex(argv[i+2], sha1) ||
 545                                     add_cacheinfo(mode, sha1, argv[i+3], 0))
 546                                         die("git-update-index: --cacheinfo"
 547                                             " cannot add %s", argv[i+3]);
 548                                 i += 3;
 549                                 continue;
 550                         }
 551                         if (!strcmp(path, "--chmod=-x") ||
 552                             !strcmp(path, "--chmod=+x")) {
 553                                 if (argc <= i+1)
 554                                         die("git-update-index: %s <path>", path);
 555                                 set_executable_bit = path[8];
 556                                 continue;
 557                         }
 558                         if (!strcmp(path, "--assume-unchanged")) {
 559                                 mark_valid_only = MARK_VALID;
 560                                 continue;
 561                         }
 562                         if (!strcmp(path, "--no-assume-unchanged")) {
 563                                 mark_valid_only = UNMARK_VALID;
 564                                 continue;
 565                         }
 566                         if (!strcmp(path, "--info-only")) {
 567                                 info_only = 1;
 568                                 continue;
 569                         }
 570                         if (!strcmp(path, "--force-remove")) {
 571                                 force_remove = 1;
 572                                 continue;
 573                         }
 574                         if (!strcmp(path, "-z")) {
 575                                 line_termination = 0;
 576                                 continue;
 577                         }
 578                         if (!strcmp(path, "--stdin")) {
 579                                 if (i != argc - 1)
 580                                         die("--stdin must be at the end");
 581                                 read_from_stdin = 1;
 582                                 break;
 583                         }
 584                         if (!strcmp(path, "--index-info")) {
 585                                 if (i != argc - 1)
 586                                         die("--index-info must be at the end");
 587                                 allow_add = allow_replace = allow_remove = 1;
 588                                 read_index_info(line_termination);
 589                                 break;
 590                         }
 591                         if (!strcmp(path, "--unresolve")) {
 592                                 has_errors = do_unresolve(argc - i, argv + i,
 593                                                           prefix, prefix_length);
 594                                 if (has_errors)
 595                                         active_cache_changed = 0;
 596                                 goto finish;
 597                         }
 598                         if (!strcmp(path, "--again")) {
 599                                 has_errors = do_reupdate(argc - i, argv + i,
 600                                                          prefix, prefix_length);
 601                                 if (has_errors)
 602                                         active_cache_changed = 0;
 603                                 goto finish;
 604                         }
 605                         if (!strcmp(path, "--ignore-missing")) {
 606                                 refresh_flags |= REFRESH_IGNORE_MISSING;
 607                                 continue;
 608                         }
 609                         if (!strcmp(path, "--verbose")) {
 610                                 verbose = 1;
 611                                 continue;
 612                         }
 613                         if (!strcmp(path, "-h") || !strcmp(path, "--help"))
 614                                 usage(update_index_usage);
 615                         die("unknown option %s", path);
 616                 }
 617                 update_one(path, prefix, prefix_length);
 618                 if (set_executable_bit)
 619                         chmod_path(set_executable_bit, path);
 620         }
 621         if (read_from_stdin) {
 622                 struct strbuf buf;
 623                 strbuf_init(&buf);
 624                 while (1) {
 625                         char *path_name;
 626                         const char *p;
 627                         read_line(&buf, stdin, line_termination);
 628                         if (buf.eof)
 629                                 break;
 630                         if (line_termination && buf.buf[0] == '"')
 631                                 path_name = unquote_c_style(buf.buf, NULL);
 632                         else
 633                                 path_name = buf.buf;
 634                         p = prefix_path(prefix, prefix_length, path_name);
 635                         update_one(p, NULL, 0);
 636                         if (set_executable_bit)
 637                                 chmod_path(set_executable_bit, p);
 638                         if (p < path_name || p > path_name + strlen(path_name))
 639                                 free((char*) p);
 640                         if (path_name != buf.buf)
 641                                 free(path_name);
 642                 }
 643         }
 644
 645  finish:
 646         if (active_cache_changed) {
 647                 if (write_cache(newfd, active_cache, active_nr) ||
 648                     commit_lock_file(&lock_file))
 649                         die("Unable to write new index file");
 650         }
 651
 652         return has_errors ? 1 : 0;
 653 }