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
  10 /*
  11  * Default to not allowing changes to the list of files. The
  12  * tool doesn't actually care, but this makes it harder to add
  13  * files to the revision control by mistake by doing something
  14  * like "git-update-index *" and suddenly having all the object
  15  * files be revision controlled.
  16  */
  17 static int allow_add;
  18 static int allow_remove;
  19 static int allow_replace;
  20 static int allow_unmerged; /* --refresh needing merge is not error */
  21 static int not_new; /* --refresh not having working tree files is not error */
  22 static int quiet; /* --refresh needing update is not error */
  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
  31 /* Three functions to allow overloaded pointer return; see linux/err.h */
  32 static inline void *ERR_PTR(long error)
  33 {
  34         return (void *) error;
  35 }
  36
  37 static inline long PTR_ERR(const void *ptr)
  38 {
  39         return (long) ptr;
  40 }
  41
  42 static inline long IS_ERR(const void *ptr)
  43 {
  44         return (unsigned long)ptr > (unsigned long)-1000L;
  45 }
  46
  47 static void report(const char *fmt, ...)
  48 {
  49         va_list vp;
  50
  51         if (!verbose)
  52                 return;
  53
  54         va_start(vp, fmt);
  55         vprintf(fmt, vp);
  56         putchar('\n');
  57         va_end(vp);
  58 }
  59
  60 static int mark_valid(const char *path)
  61 {
  62         int namelen = strlen(path);
  63         int pos = cache_name_pos(path, namelen);
  64         if (0 <= pos) {
  65                 switch (mark_valid_only) {
  66                 case MARK_VALID:
  67                         active_cache[pos]->ce_flags |= htons(CE_VALID);
  68                         break;
  69                 case UNMARK_VALID:
  70                         active_cache[pos]->ce_flags &= ~htons(CE_VALID);
  71                         break;
  72                 }
  73                 active_cache_changed = 1;
  74                 return 0;
  75         }
  76         return -1;
  77 }
  78
  79 static int add_file_to_cache(const char *path)
  80 {
  81         int size, namelen, option, status;
  82         struct cache_entry *ce;
  83         struct stat st;
  84
  85         status = lstat(path, &st);
  86         if (status < 0 || S_ISDIR(st.st_mode)) {
  87                 /* When we used to have "path" and now we want to add
  88                  * "path/file", we need a way to remove "path" before
  89                  * being able to add "path/file".  However,
  90                  * "git-update-index --remove path" would not work.
  91                  * --force-remove can be used but this is more user
  92                  * friendly, especially since we can do the opposite
  93                  * case just fine without --force-remove.
  94                  */
  95                 if (status == 0 || (errno == ENOENT || errno == ENOTDIR)) {
  96                         if (allow_remove) {
  97                                 if (remove_file_from_cache(path))
  98                                         return error("%s: cannot remove from the index",
  99                                                      path);
 100                                 else
 101                                         return 0;
 102                         } else if (status < 0) {
 103                                 return error("%s: does not exist and --remove not passed",
 104                                              path);
 105                         }
 106                 }
 107                 if (0 == status)
 108                         return error("%s: is a directory - add files inside instead",
 109                                      path);
 110                 else
 111                         return error("lstat(\"%s\"): %s", path,
 112                                      strerror(errno));
 113         }
 114
 115         namelen = strlen(path);
 116         size = cache_entry_size(namelen);
 117         ce = xmalloc(size);
 118         memset(ce, 0, size);
 119         memcpy(ce->name, path, namelen);
 120         ce->ce_flags = htons(namelen);
 121         fill_stat_cache_info(ce, &st);
 122
 123         ce->ce_mode = create_ce_mode(st.st_mode);
 124         if (!trust_executable_bit) {
 125                 /* If there is an existing entry, pick the mode bits
 126                  * from it.
 127                  */
 128                 int pos = cache_name_pos(path, namelen);
 129                 if (0 <= pos)
 130                         ce->ce_mode = active_cache[pos]->ce_mode;
 131         }
 132
 133         if (index_path(ce->sha1, path, &st, !info_only))
 134                 return -1;
 135         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 136         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 137         if (add_cache_entry(ce, option))
 138                 return error("%s: cannot add to the index - missing --add option?",
 139                              path);
 140         return 0;
 141 }
 142
 143 /*
 144  * "refresh" does not calculate a new sha1 file or bring the
 145  * cache up-to-date for mode/content changes. But what it
 146  * _does_ do is to "re-match" the stat information of a file
 147  * with the cache, so that you can refresh the cache for a
 148  * file that hasn't been changed but where the stat entry is
 149  * out of date.
 150  *
 151  * For example, you'd want to do this after doing a "git-read-tree",
 152  * to link up the stat cache details with the proper files.
 153  */
 154 static struct cache_entry *refresh_entry(struct cache_entry *ce, int really)
 155 {
 156         struct stat st;
 157         struct cache_entry *updated;
 158         int changed, size;
 159
 160         if (lstat(ce->name, &st) < 0)
 161                 return ERR_PTR(-errno);
 162
 163         changed = ce_match_stat(ce, &st, really);
 164         if (!changed) {
 165                 if (really && assume_unchanged &&
 166                     !(ce->ce_flags & htons(CE_VALID)))
 167                         ; /* mark this one VALID again */
 168                 else
 169                         return NULL;
 170         }
 171
 172         if (ce_modified(ce, &st, really))
 173                 return ERR_PTR(-EINVAL);
 174
 175         size = ce_size(ce);
 176         updated = xmalloc(size);
 177         memcpy(updated, ce, size);
 178         fill_stat_cache_info(updated, &st);
 179
 180         /* In this case, if really is not set, we should leave
 181          * CE_VALID bit alone.  Otherwise, paths marked with
 182          * --no-assume-unchanged (i.e. things to be edited) will
 183          * reacquire CE_VALID bit automatically, which is not
 184          * really what we want.
 185          */
 186         if (!really && assume_unchanged && !(ce->ce_flags & htons(CE_VALID)))
 187                 updated->ce_flags &= ~htons(CE_VALID);
 188
 189         return updated;
 190 }
 191
 192 static int refresh_cache(int really)
 193 {
 194         int i;
 195         int has_errors = 0;
 196
 197         for (i = 0; i < active_nr; i++) {
 198                 struct cache_entry *ce, *new;
 199                 ce = active_cache[i];
 200                 if (ce_stage(ce)) {
 201                         while ((i < active_nr) &&
 202                                ! strcmp(active_cache[i]->name, ce->name))
 203                                 i++;
 204                         i--;
 205                         if (allow_unmerged)
 206                                 continue;
 207                         printf("%s: needs merge\n", ce->name);
 208                         has_errors = 1;
 209                         continue;
 210                 }
 211
 212                 new = refresh_entry(ce, really);
 213                 if (!new)
 214                         continue;
 215                 if (IS_ERR(new)) {
 216                         if (not_new && PTR_ERR(new) == -ENOENT)
 217                                 continue;
 218                         if (really && PTR_ERR(new) == -EINVAL) {
 219                                 /* If we are doing --really-refresh that
 220                                  * means the index is not valid anymore.
 221                                  */
 222                                 ce->ce_flags &= ~htons(CE_VALID);
 223                                 active_cache_changed = 1;
 224                         }
 225                         if (quiet)
 226                                 continue;
 227                         printf("%s: needs update\n", ce->name);
 228                         has_errors = 1;
 229                         continue;
 230                 }
 231                 active_cache_changed = 1;
 232                 /* You can NOT just free active_cache[i] here, since it
 233                  * might not be necessarily malloc()ed but can also come
 234                  * from mmap(). */
 235                 active_cache[i] = new;
 236         }
 237         return has_errors;
 238 }
 239
 240 /*
 241  * We fundamentally don't like some paths: we don't want
 242  * dot or dot-dot anywhere, and for obvious reasons don't
 243  * want to recurse into ".git" either.
 244  *
 245  * Also, we don't want double slashes or slashes at the
 246  * end that can make pathnames ambiguous.
 247  */
 248 static int verify_dotfile(const char *rest)
 249 {
 250         /*
 251          * The first character was '.', but that
 252          * has already been discarded, we now test
 253          * the rest.
 254          */
 255         switch (*rest) {
 256         /* "." is not allowed */
 257         case '\0': case '/':
 258                 return 0;
 259
 260         /*
 261          * ".git" followed by  NUL or slash is bad. This
 262          * shares the path end test with the ".." case.
 263          */
 264         case 'g':
 265                 if (rest[1] != 'i')
 266                         break;
 267                 if (rest[2] != 't')
 268                         break;
 269                 rest += 2;
 270         /* fallthrough */
 271         case '.':
 272                 if (rest[1] == '\0' || rest[1] == '/')
 273                         return 0;
 274         }
 275         return 1;
 276 }
 277
 278 static int verify_path(const char *path)
 279 {
 280         char c;
 281
 282         goto inside;
 283         for (;;) {
 284                 if (!c)
 285                         return 1;
 286                 if (c == '/') {
 287 inside:
 288                         c = *path++;
 289                         switch (c) {
 290                         default:
 291                                 continue;
 292                         case '/': case '\0':
 293                                 break;
 294                         case '.':
 295                                 if (verify_dotfile(path))
 296                                         continue;
 297                         }
 298                         return 0;
 299                 }
 300                 c = *path++;
 301         }
 302 }
 303
 304 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
 305                          const char *path, int stage)
 306 {
 307         int size, len, option;
 308         struct cache_entry *ce;
 309
 310         if (!verify_path(path))
 311                 return -1;
 312
 313         len = strlen(path);
 314         size = cache_entry_size(len);
 315         ce = xmalloc(size);
 316         memset(ce, 0, size);
 317
 318         memcpy(ce->sha1, sha1, 20);
 319         memcpy(ce->name, path, len);
 320         ce->ce_flags = create_ce_flags(len, stage);
 321         ce->ce_mode = create_ce_mode(mode);
 322         if (assume_unchanged)
 323                 ce->ce_flags |= htons(CE_VALID);
 324         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 325         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 326         if (add_cache_entry(ce, option))
 327                 return error("%s: cannot add to the index - missing --add option?",
 328                              path);
 329         report("add '%s'", path);
 330         return 0;
 331 }
 332
 333 static int chmod_path(int flip, const char *path)
 334 {
 335         int pos;
 336         struct cache_entry *ce;
 337         unsigned int mode;
 338
 339         pos = cache_name_pos(path, strlen(path));
 340         if (pos < 0)
 341                 return -1;
 342         ce = active_cache[pos];
 343         mode = ntohl(ce->ce_mode);
 344         if (!S_ISREG(mode))
 345                 return -1;
 346         switch (flip) {
 347         case '+':
 348                 ce->ce_mode |= htonl(0111); break;
 349         case '-':
 350                 ce->ce_mode &= htonl(~0111); break;
 351         default:
 352                 return -1;
 353         }
 354         active_cache_changed = 1;
 355         return 0;
 356 }
 357
 358 static struct cache_file cache_file;
 359
 360 static void update_one(const char *path, const char *prefix, int prefix_length)
 361 {
 362         const char *p = prefix_path(prefix, prefix_length, path);
 363         if (!verify_path(p)) {
 364                 fprintf(stderr, "Ignoring path %s\n", path);
 365                 return;
 366         }
 367         if (mark_valid_only) {
 368                 if (mark_valid(p))
 369                         die("Unable to mark file %s", path);
 370                 return;
 371         }
 372
 373         if (force_remove) {
 374                 if (remove_file_from_cache(p))
 375                         die("git-update-index: unable to remove %s", path);
 376                 report("remove '%s'", path);
 377                 return;
 378         }
 379         if (add_file_to_cache(p))
 380                 die("Unable to process file %s", path);
 381         report("add '%s'", path);
 382 }
 383
 384 static void read_index_info(int line_termination)
 385 {
 386         struct strbuf buf;
 387         strbuf_init(&buf);
 388         while (1) {
 389                 char *ptr, *tab;
 390                 char *path_name;
 391                 unsigned char sha1[20];
 392                 unsigned int mode;
 393                 int stage;
 394
 395                 /* This reads lines formatted in one of three formats:
 396                  *
 397                  * (1) mode         SP sha1          TAB path
 398                  * The first format is what "git-apply --index-info"
 399                  * reports, and used to reconstruct a partial tree
 400                  * that is used for phony merge base tree when falling
 401                  * back on 3-way merge.
 402                  *
 403                  * (2) mode SP type SP sha1          TAB path
 404                  * The second format is to stuff git-ls-tree output
 405                  * into the index file.
 406                  *
 407                  * (3) mode         SP sha1 SP stage TAB path
 408                  * This format is to put higher order stages into the
 409                  * index file and matches git-ls-files --stage output.
 410                  */
 411                 read_line(&buf, stdin, line_termination);
 412                 if (buf.eof)
 413                         break;
 414
 415                 mode = strtoul(buf.buf, &ptr, 8);
 416                 if (ptr == buf.buf || *ptr != ' ')
 417                         goto bad_line;
 418
 419                 tab = strchr(ptr, '\t');
 420                 if (!tab || tab - ptr < 41)
 421                         goto bad_line;
 422
 423                 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
 424                         stage = tab[-1] - '0';
 425                         ptr = tab + 1; /* point at the head of path */
 426                         tab = tab - 2; /* point at tail of sha1 */
 427                 }
 428                 else {
 429                         stage = 0;
 430                         ptr = tab + 1; /* point at the head of path */
 431                 }
 432
 433                 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
 434                         goto bad_line;
 435
 436                 if (line_termination && ptr[0] == '"')
 437                         path_name = unquote_c_style(ptr, NULL);
 438                 else
 439                         path_name = ptr;
 440
 441                 if (!verify_path(path_name)) {
 442                         fprintf(stderr, "Ignoring path %s\n", path_name);
 443                         if (path_name != ptr)
 444                                 free(path_name);
 445                         continue;
 446                 }
 447
 448                 if (!mode) {
 449                         /* mode == 0 means there is no such path -- remove */
 450                         if (remove_file_from_cache(path_name))
 451                                 die("git-update-index: unable to remove %s",
 452                                     ptr);
 453                 }
 454                 else {
 455                         /* mode ' ' sha1 '\t' name
 456                          * ptr[-1] points at tab,
 457                          * ptr[-41] is at the beginning of sha1
 458                          */
 459                         ptr[-42] = ptr[-1] = 0;
 460                         if (add_cacheinfo(mode, sha1, path_name, stage))
 461                                 die("git-update-index: unable to update %s",
 462                                     path_name);
 463                 }
 464                 if (path_name != ptr)
 465                         free(path_name);
 466                 continue;
 467
 468         bad_line:
 469                 die("malformed index info %s", buf.buf);
 470         }
 471 }
 472
 473 static const char update_index_usage[] =
 474 "git-update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--cacheinfo] [--chmod=(+|-)x] [--info-only] [--force-remove] [--stdin] [--index-info] [--ignore-missing] [-z] [--verbose] [--] <file>...";
 475
 476 int main(int argc, const char **argv)
 477 {
 478         int i, newfd, entries, has_errors = 0, line_termination = '\n';
 479         int allow_options = 1;
 480         int read_from_stdin = 0;
 481         const char *prefix = setup_git_directory();
 482         int prefix_length = prefix ? strlen(prefix) : 0;
 483
 484         git_config(git_default_config);
 485
 486         newfd = hold_index_file_for_update(&cache_file, get_index_file());
 487         if (newfd < 0)
 488                 die("unable to create new cachefile");
 489
 490         entries = read_cache();
 491         if (entries < 0)
 492                 die("cache corrupted");
 493
 494         for (i = 1 ; i < argc; i++) {
 495                 const char *path = argv[i];
 496
 497                 if (allow_options && *path == '-') {
 498                         if (!strcmp(path, "--")) {
 499                                 allow_options = 0;
 500                                 continue;
 501                         }
 502                         if (!strcmp(path, "-q")) {
 503                                 quiet = 1;
 504                                 continue;
 505                         }
 506                         if (!strcmp(path, "--add")) {
 507                                 allow_add = 1;
 508                                 continue;
 509                         }
 510                         if (!strcmp(path, "--replace")) {
 511                                 allow_replace = 1;
 512                                 continue;
 513                         }
 514                         if (!strcmp(path, "--remove")) {
 515                                 allow_remove = 1;
 516                                 continue;
 517                         }
 518                         if (!strcmp(path, "--unmerged")) {
 519                                 allow_unmerged = 1;
 520                                 continue;
 521                         }
 522                         if (!strcmp(path, "--refresh")) {
 523                                 has_errors |= refresh_cache(0);
 524                                 continue;
 525                         }
 526                         if (!strcmp(path, "--really-refresh")) {
 527                                 has_errors |= refresh_cache(1);
 528                                 continue;
 529                         }
 530                         if (!strcmp(path, "--cacheinfo")) {
 531                                 unsigned char sha1[20];
 532                                 unsigned int mode;
 533
 534                                 if (i+3 >= argc)
 535                                         die("git-update-index: --cacheinfo <mode> <sha1> <path>");
 536
 537                                 if ((sscanf(argv[i+1], "%o", &mode) != 1) ||
 538                                     get_sha1_hex(argv[i+2], sha1) ||
 539                                     add_cacheinfo(mode, sha1, argv[i+3], 0))
 540                                         die("git-update-index: --cacheinfo"
 541                                             " cannot add %s", argv[i+3]);
 542                                 i += 3;
 543                                 continue;
 544                         }
 545                         if (!strcmp(path, "--chmod=-x") ||
 546                             !strcmp(path, "--chmod=+x")) {
 547                                 if (argc <= i+1)
 548                                         die("git-update-index: %s <path>", path);
 549                                 if (chmod_path(path[8], argv[++i]))
 550                                         die("git-update-index: %s cannot chmod %s", path, argv[i]);
 551                                 continue;
 552                         }
 553                         if (!strcmp(path, "--assume-unchanged")) {
 554                                 mark_valid_only = MARK_VALID;
 555                                 continue;
 556                         }
 557                         if (!strcmp(path, "--no-assume-unchanged")) {
 558                                 mark_valid_only = UNMARK_VALID;
 559                                 continue;
 560                         }
 561                         if (!strcmp(path, "--info-only")) {
 562                                 info_only = 1;
 563                                 continue;
 564                         }
 565                         if (!strcmp(path, "--force-remove")) {
 566                                 force_remove = 1;
 567                                 continue;
 568                         }
 569                         if (!strcmp(path, "-z")) {
 570                                 line_termination = 0;
 571                                 continue;
 572                         }
 573                         if (!strcmp(path, "--stdin")) {
 574                                 if (i != argc - 1)
 575                                         die("--stdin must be at the end");
 576                                 read_from_stdin = 1;
 577                                 break;
 578                         }
 579                         if (!strcmp(path, "--index-info")) {
 580                                 allow_add = allow_replace = allow_remove = 1;
 581                                 read_index_info(line_termination);
 582                                 continue;
 583                         }
 584                         if (!strcmp(path, "--ignore-missing")) {
 585                                 not_new = 1;
 586                                 continue;
 587                         }
 588                         if (!strcmp(path, "--verbose")) {
 589                                 verbose = 1;
 590                                 continue;
 591                         }
 592                         if (!strcmp(path, "-h") || !strcmp(path, "--help"))
 593                                 usage(update_index_usage);
 594                         die("unknown option %s", path);
 595                 }
 596                 update_one(path, prefix, prefix_length);
 597         }
 598         if (read_from_stdin) {
 599                 struct strbuf buf;
 600                 strbuf_init(&buf);
 601                 while (1) {
 602                         char *path_name;
 603                         read_line(&buf, stdin, line_termination);
 604                         if (buf.eof)
 605                                 break;
 606                         if (line_termination && buf.buf[0] == '"')
 607                                 path_name = unquote_c_style(buf.buf, NULL);
 608                         else
 609                                 path_name = buf.buf;
 610                         update_one(path_name, prefix, prefix_length);
 611                         if (path_name != buf.buf)
 612                                 free(path_name);
 613                 }
 614         }
 615         if (active_cache_changed) {
 616                 if (write_cache(newfd, active_cache, active_nr) ||
 617                     commit_index_file(&cache_file))
 618                         die("Unable to write new cachefile");
 619         }
 620
 621         return has_errors ? 1 : 0;
 622 }