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
  11 /*
  12  * Default to not allowing changes to the list of files. The
  13  * tool doesn't actually care, but this makes it harder to add
  14  * files to the revision control by mistake by doing something
  15  * like "git-update-index *" and suddenly having all the object
  16  * files be revision controlled.
  17  */
  18 static int allow_add;
  19 static int allow_remove;
  20 static int allow_replace;
  21 static int allow_unmerged; /* --refresh needing merge is not error */
  22 static int not_new; /* --refresh not having working tree files is not error */
  23 static int quiet; /* --refresh needing update is not error */
  24 static int info_only;
  25 static int force_remove;
  26 static int verbose;
  27 static int mark_valid_only = 0;
  28 #define MARK_VALID 1
  29 #define UNMARK_VALID 2
  30
  31
  32 /* Three functions to allow overloaded pointer return; see linux/err.h */
  33 static inline void *ERR_PTR(long error)
  34 {
  35         return (void *) error;
  36 }
  37
  38 static inline long PTR_ERR(const void *ptr)
  39 {
  40         return (long) ptr;
  41 }
  42
  43 static inline long IS_ERR(const void *ptr)
  44 {
  45         return (unsigned long)ptr > (unsigned long)-1000L;
  46 }
  47
  48 static void report(const char *fmt, ...)
  49 {
  50         va_list vp;
  51
  52         if (!verbose)
  53                 return;
  54
  55         va_start(vp, fmt);
  56         vprintf(fmt, vp);
  57         putchar('\n');
  58         va_end(vp);
  59 }
  60
  61 static int mark_valid(const char *path)
  62 {
  63         int namelen = strlen(path);
  64         int pos = cache_name_pos(path, namelen);
  65         if (0 <= pos) {
  66                 switch (mark_valid_only) {
  67                 case MARK_VALID:
  68                         active_cache[pos]->ce_flags |= htons(CE_VALID);
  69                         break;
  70                 case UNMARK_VALID:
  71                         active_cache[pos]->ce_flags &= ~htons(CE_VALID);
  72                         break;
  73                 }
  74                 cache_tree_invalidate_path(active_cache_tree, path);
  75                 active_cache_changed = 1;
  76                 return 0;
  77         }
  78         return -1;
  79 }
  80
  81 static int add_file_to_cache(const char *path)
  82 {
  83         int size, namelen, option, status;
  84         struct cache_entry *ce;
  85         struct stat st;
  86
  87         status = lstat(path, &st);
  88
  89         /* We probably want to do this in remove_file_from_cache() and
  90          * add_cache_entry() instead...
  91          */
  92         cache_tree_invalidate_path(active_cache_tree, path);
  93
  94         if (status < 0 || S_ISDIR(st.st_mode)) {
  95                 /* When we used to have "path" and now we want to add
  96                  * "path/file", we need a way to remove "path" before
  97                  * being able to add "path/file".  However,
  98                  * "git-update-index --remove path" would not work.
  99                  * --force-remove can be used but this is more user
 100                  * friendly, especially since we can do the opposite
 101                  * case just fine without --force-remove.
 102                  */
 103                 if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
 104                         if (allow_remove) {
 105                                 if (remove_file_from_cache(path))
 106                                         return error("%s: cannot remove from the index",
 107                                                      path);
 108                                 else
 109                                         return 0;
 110                         } else if (status < 0) {
 111                                 return error("%s: does not exist and --remove not passed",
 112                                              path);
 113                         }
 114                 }
 115                 if (0 == status)
 116                         return error("%s: is a directory - add files inside instead",
 117                                      path);
 118                 else
 119                         return error("lstat(\"%s\"): %s", path,
 120                                      strerror(errno));
 121         }
 122
 123         namelen = strlen(path);
 124         size = cache_entry_size(namelen);
 125         ce = xcalloc(1, size);
 126         memcpy(ce->name, path, namelen);
 127         ce->ce_flags = htons(namelen);
 128         fill_stat_cache_info(ce, &st);
 129
 130         ce->ce_mode = create_ce_mode(st.st_mode);
 131         if (!trust_executable_bit) {
 132                 /* If there is an existing entry, pick the mode bits
 133                  * from it.
 134                  */
 135                 int pos = cache_name_pos(path, namelen);
 136                 if (0 <= pos)
 137                         ce->ce_mode = active_cache[pos]->ce_mode;
 138         }
 139
 140         if (index_path(ce->sha1, path, &st, !info_only))
 141                 return -1;
 142         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 143         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 144         if (add_cache_entry(ce, option))
 145                 return error("%s: cannot add to the index - missing --add option?",
 146                              path);
 147         return 0;
 148 }
 149
 150 /*
 151  * "refresh" does not calculate a new sha1 file or bring the
 152  * cache up-to-date for mode/content changes. But what it
 153  * _does_ do is to "re-match" the stat information of a file
 154  * with the cache, so that you can refresh the cache for a
 155  * file that hasn't been changed but where the stat entry is
 156  * out of date.
 157  *
 158  * For example, you'd want to do this after doing a "git-read-tree",
 159  * to link up the stat cache details with the proper files.
 160  */
 161 static struct cache_entry *refresh_entry(struct cache_entry *ce, int really)
 162 {
 163         struct stat st;
 164         struct cache_entry *updated;
 165         int changed, size;
 166
 167         if (lstat(ce->name, &st) < 0)
 168                 return ERR_PTR(-errno);
 169
 170         changed = ce_match_stat(ce, &st, really);
 171         if (!changed) {
 172                 if (really && assume_unchanged &&
 173                     !(ce->ce_flags & htons(CE_VALID)))
 174                         ; /* mark this one VALID again */
 175                 else
 176                         return NULL;
 177         }
 178
 179         if (ce_modified(ce, &st, really))
 180                 return ERR_PTR(-EINVAL);
 181
 182         size = ce_size(ce);
 183         updated = xmalloc(size);
 184         memcpy(updated, ce, size);
 185         fill_stat_cache_info(updated, &st);
 186
 187         /* In this case, if really is not set, we should leave
 188          * CE_VALID bit alone.  Otherwise, paths marked with
 189          * --no-assume-unchanged (i.e. things to be edited) will
 190          * reacquire CE_VALID bit automatically, which is not
 191          * really what we want.
 192          */
 193         if (!really && assume_unchanged && !(ce->ce_flags & htons(CE_VALID)))
 194                 updated->ce_flags &= ~htons(CE_VALID);
 195
 196         return updated;
 197 }
 198
 199 static int refresh_cache(int really)
 200 {
 201         int i;
 202         int has_errors = 0;
 203
 204         for (i = 0; i < active_nr; i++) {
 205                 struct cache_entry *ce, *new;
 206                 ce = active_cache[i];
 207                 if (ce_stage(ce)) {
 208                         while ((i < active_nr) &&
 209                                ! strcmp(active_cache[i]->name, ce->name))
 210                                 i++;
 211                         i--;
 212                         if (allow_unmerged)
 213                                 continue;
 214                         printf("%s: needs merge\n", ce->name);
 215                         has_errors = 1;
 216                         continue;
 217                 }
 218
 219                 new = refresh_entry(ce, really);
 220                 if (!new)
 221                         continue;
 222                 if (IS_ERR(new)) {
 223                         if (not_new && PTR_ERR(new) == -ENOENT)
 224                                 continue;
 225                         if (really && PTR_ERR(new) == -EINVAL) {
 226                                 /* If we are doing --really-refresh that
 227                                  * means the index is not valid anymore.
 228                                  */
 229                                 ce->ce_flags &= ~htons(CE_VALID);
 230                                 active_cache_changed = 1;
 231                         }
 232                         if (quiet)
 233                                 continue;
 234                         printf("%s: needs update\n", ce->name);
 235                         has_errors = 1;
 236                         continue;
 237                 }
 238                 active_cache_changed = 1;
 239                 /* You can NOT just free active_cache[i] here, since it
 240                  * might not be necessarily malloc()ed but can also come
 241                  * from mmap(). */
 242                 active_cache[i] = new;
 243         }
 244         return has_errors;
 245 }
 246
 247 /*
 248  * We fundamentally don't like some paths: we don't want
 249  * dot or dot-dot anywhere, and for obvious reasons don't
 250  * want to recurse into ".git" either.
 251  *
 252  * Also, we don't want double slashes or slashes at the
 253  * end that can make pathnames ambiguous.
 254  */
 255 static int verify_dotfile(const char *rest)
 256 {
 257         /*
 258          * The first character was '.', but that
 259          * has already been discarded, we now test
 260          * the rest.
 261          */
 262         switch (*rest) {
 263         /* "." is not allowed */
 264         case '\0': case '/':
 265                 return 0;
 266
 267         /*
 268          * ".git" followed by  NUL or slash is bad. This
 269          * shares the path end test with the ".." case.
 270          */
 271         case 'g':
 272                 if (rest[1] != 'i')
 273                         break;
 274                 if (rest[2] != 't')
 275                         break;
 276                 rest += 2;
 277         /* fallthrough */
 278         case '.':
 279                 if (rest[1] == '\0' || rest[1] == '/')
 280                         return 0;
 281         }
 282         return 1;
 283 }
 284
 285 static int verify_path(const char *path)
 286 {
 287         char c;
 288
 289         goto inside;
 290         for (;;) {
 291                 if (!c)
 292                         return 1;
 293                 if (c == '/') {
 294 inside:
 295                         c = *path++;
 296                         switch (c) {
 297                         default:
 298                                 continue;
 299                         case '/': case '\0':
 300                                 break;
 301                         case '.':
 302                                 if (verify_dotfile(path))
 303                                         continue;
 304                         }
 305                         return 0;
 306                 }
 307                 c = *path++;
 308         }
 309 }
 310
 311 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
 312                          const char *path, int stage)
 313 {
 314         int size, len, option;
 315         struct cache_entry *ce;
 316
 317         if (!verify_path(path))
 318                 return -1;
 319
 320         len = strlen(path);
 321         size = cache_entry_size(len);
 322         ce = xcalloc(1, size);
 323
 324         memcpy(ce->sha1, sha1, 20);
 325         memcpy(ce->name, path, len);
 326         ce->ce_flags = create_ce_flags(len, stage);
 327         ce->ce_mode = create_ce_mode(mode);
 328         if (assume_unchanged)
 329                 ce->ce_flags |= htons(CE_VALID);
 330         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 331         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 332         if (add_cache_entry(ce, option))
 333                 return error("%s: cannot add to the index - missing --add option?",
 334                              path);
 335         report("add '%s'", path);
 336         cache_tree_invalidate_path(active_cache_tree, path);
 337         return 0;
 338 }
 339
 340 static int chmod_path(int flip, const char *path)
 341 {
 342         int pos;
 343         struct cache_entry *ce;
 344         unsigned int mode;
 345
 346         pos = cache_name_pos(path, strlen(path));
 347         if (pos < 0)
 348                 return -1;
 349         ce = active_cache[pos];
 350         mode = ntohl(ce->ce_mode);
 351         if (!S_ISREG(mode))
 352                 return -1;
 353         switch (flip) {
 354         case '+':
 355                 ce->ce_mode |= htonl(0111); break;
 356         case '-':
 357                 ce->ce_mode &= htonl(~0111); break;
 358         default:
 359                 return -1;
 360         }
 361         cache_tree_invalidate_path(active_cache_tree, path);
 362         active_cache_changed = 1;
 363         return 0;
 364 }
 365
 366 static struct cache_file cache_file;
 367
 368 static void update_one(const char *path, const char *prefix, int prefix_length)
 369 {
 370         const char *p = prefix_path(prefix, prefix_length, path);
 371         if (!verify_path(p)) {
 372                 fprintf(stderr, "Ignoring path %s\n", path);
 373                 return;
 374         }
 375         if (mark_valid_only) {
 376                 if (mark_valid(p))
 377                         die("Unable to mark file %s", path);
 378                 return;
 379         }
 380         cache_tree_invalidate_path(active_cache_tree, path);
 381
 382         if (force_remove) {
 383                 if (remove_file_from_cache(p))
 384                         die("git-update-index: unable to remove %s", path);
 385                 report("remove '%s'", path);
 386                 return;
 387         }
 388         if (add_file_to_cache(p))
 389                 die("Unable to process file %s", path);
 390         report("add '%s'", path);
 391 }
 392
 393 static void read_index_info(int line_termination)
 394 {
 395         struct strbuf buf;
 396         strbuf_init(&buf);
 397         while (1) {
 398                 char *ptr, *tab;
 399                 char *path_name;
 400                 unsigned char sha1[20];
 401                 unsigned int mode;
 402                 int stage;
 403
 404                 /* This reads lines formatted in one of three formats:
 405                  *
 406                  * (1) mode         SP sha1          TAB path
 407                  * The first format is what "git-apply --index-info"
 408                  * reports, and used to reconstruct a partial tree
 409                  * that is used for phony merge base tree when falling
 410                  * back on 3-way merge.
 411                  *
 412                  * (2) mode SP type SP sha1          TAB path
 413                  * The second format is to stuff git-ls-tree output
 414                  * into the index file.
 415                  *
 416                  * (3) mode         SP sha1 SP stage TAB path
 417                  * This format is to put higher order stages into the
 418                  * index file and matches git-ls-files --stage output.
 419                  */
 420                 read_line(&buf, stdin, line_termination);
 421                 if (buf.eof)
 422                         break;
 423
 424                 mode = strtoul(buf.buf, &ptr, 8);
 425                 if (ptr == buf.buf || *ptr != ' ')
 426                         goto bad_line;
 427
 428                 tab = strchr(ptr, '\t');
 429                 if (!tab || tab - ptr < 41)
 430                         goto bad_line;
 431
 432                 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
 433                         stage = tab[-1] - '0';
 434                         ptr = tab + 1; /* point at the head of path */
 435                         tab = tab - 2; /* point at tail of sha1 */
 436                 }
 437                 else {
 438                         stage = 0;
 439                         ptr = tab + 1; /* point at the head of path */
 440                 }
 441
 442                 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
 443                         goto bad_line;
 444
 445                 if (line_termination && ptr[0] == '"')
 446                         path_name = unquote_c_style(ptr, NULL);
 447                 else
 448                         path_name = ptr;
 449
 450                 if (!verify_path(path_name)) {
 451                         fprintf(stderr, "Ignoring path %s\n", path_name);
 452                         if (path_name != ptr)
 453                                 free(path_name);
 454                         continue;
 455                 }
 456                 cache_tree_invalidate_path(active_cache_tree, path_name);
 457
 458                 if (!mode) {
 459                         /* mode == 0 means there is no such path -- remove */
 460                         if (remove_file_from_cache(path_name))
 461                                 die("git-update-index: unable to remove %s",
 462                                     ptr);
 463                 }
 464                 else {
 465                         /* mode ' ' sha1 '\t' name
 466                          * ptr[-1] points at tab,
 467                          * ptr[-41] is at the beginning of sha1
 468                          */
 469                         ptr[-42] = ptr[-1] = 0;
 470                         if (add_cacheinfo(mode, sha1, path_name, stage))
 471                                 die("git-update-index: unable to update %s",
 472                                     path_name);
 473                 }
 474                 if (path_name != ptr)
 475                         free(path_name);
 476                 continue;
 477
 478         bad_line:
 479                 die("malformed index info %s", buf.buf);
 480         }
 481 }
 482
 483 static const char update_index_usage[] =
 484 "git-update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--cacheinfo] [--chmod=(+|-)x] [--info-only] [--force-remove] [--stdin] [--index-info] [--ignore-missing] [-z] [--verbose] [--] <file>...";
 485
 486 int main(int argc, const char **argv)
 487 {
 488         int i, newfd, entries, has_errors = 0, line_termination = '\n';
 489         int allow_options = 1;
 490         int read_from_stdin = 0;
 491         const char *prefix = setup_git_directory();
 492         int prefix_length = prefix ? strlen(prefix) : 0;
 493
 494         git_config(git_default_config);
 495
 496         newfd = hold_index_file_for_update(&cache_file, get_index_file());
 497         if (newfd < 0)
 498                 die("unable to create new cachefile");
 499
 500         entries = read_cache();
 501         if (entries < 0)
 502                 die("cache corrupted");
 503
 504         for (i = 1 ; i < argc; i++) {
 505                 const char *path = argv[i];
 506
 507                 if (allow_options && *path == '-') {
 508                         if (!strcmp(path, "--")) {
 509                                 allow_options = 0;
 510                                 continue;
 511                         }
 512                         if (!strcmp(path, "-q")) {
 513                                 quiet = 1;
 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                                 allow_unmerged = 1;
 530                                 continue;
 531                         }
 532                         if (!strcmp(path, "--refresh")) {
 533                                 has_errors |= refresh_cache(0);
 534                                 continue;
 535                         }
 536                         if (!strcmp(path, "--really-refresh")) {
 537                                 has_errors |= refresh_cache(1);
 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                                 if (chmod_path(path[8], argv[++i]))
 560                                         die("git-update-index: %s cannot chmod %s", path, argv[i]);
 561                                 continue;
 562                         }
 563                         if (!strcmp(path, "--assume-unchanged")) {
 564                                 mark_valid_only = MARK_VALID;
 565                                 continue;
 566                         }
 567                         if (!strcmp(path, "--no-assume-unchanged")) {
 568                                 mark_valid_only = UNMARK_VALID;
 569                                 continue;
 570                         }
 571                         if (!strcmp(path, "--info-only")) {
 572                                 info_only = 1;
 573                                 continue;
 574                         }
 575                         if (!strcmp(path, "--force-remove")) {
 576                                 force_remove = 1;
 577                                 continue;
 578                         }
 579                         if (!strcmp(path, "-z")) {
 580                                 line_termination = 0;
 581                                 continue;
 582                         }
 583                         if (!strcmp(path, "--stdin")) {
 584                                 if (i != argc - 1)
 585                                         die("--stdin must be at the end");
 586                                 read_from_stdin = 1;
 587                                 break;
 588                         }
 589                         if (!strcmp(path, "--index-info")) {
 590                                 if (i != argc - 1)
 591                                         die("--index-info must be at the end");
 592                                 allow_add = allow_replace = allow_remove = 1;
 593                                 read_index_info(line_termination);
 594                                 break;
 595                         }
 596                         if (!strcmp(path, "--ignore-missing")) {
 597                                 not_new = 1;
 598                                 continue;
 599                         }
 600                         if (!strcmp(path, "--verbose")) {
 601                                 verbose = 1;
 602                                 continue;
 603                         }
 604                         if (!strcmp(path, "-h") || !strcmp(path, "--help"))
 605                                 usage(update_index_usage);
 606                         die("unknown option %s", path);
 607                 }
 608                 update_one(path, prefix, prefix_length);
 609         }
 610         if (read_from_stdin) {
 611                 struct strbuf buf;
 612                 strbuf_init(&buf);
 613                 while (1) {
 614                         char *path_name;
 615                         read_line(&buf, stdin, line_termination);
 616                         if (buf.eof)
 617                                 break;
 618                         if (line_termination && buf.buf[0] == '"')
 619                                 path_name = unquote_c_style(buf.buf, NULL);
 620                         else
 621                                 path_name = buf.buf;
 622                         update_one(path_name, prefix, prefix_length);
 623                         if (path_name != buf.buf)
 624                                 free(path_name);
 625                 }
 626         }
 627         if (active_cache_changed) {
 628                 if (write_cache(newfd, active_cache, active_nr) ||
 629                     commit_index_file(&cache_file))
 630                         die("Unable to write new cachefile");
 631         }
 632
 633         return has_errors ? 1 : 0;
 634 }