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                 return NULL;
 166
 167         if (ce_modified(ce, &st, really))
 168                 return ERR_PTR(-EINVAL);
 169
 170         size = ce_size(ce);
 171         updated = xmalloc(size);
 172         memcpy(updated, ce, size);
 173         fill_stat_cache_info(updated, &st);
 174
 175         return updated;
 176 }
 177
 178 static int refresh_cache(int really)
 179 {
 180         int i;
 181         int has_errors = 0;
 182
 183         for (i = 0; i < active_nr; i++) {
 184                 struct cache_entry *ce, *new;
 185                 ce = active_cache[i];
 186                 if (ce_stage(ce)) {
 187                         while ((i < active_nr) &&
 188                                ! strcmp(active_cache[i]->name, ce->name))
 189                                 i++;
 190                         i--;
 191                         if (allow_unmerged)
 192                                 continue;
 193                         printf("%s: needs merge\n", ce->name);
 194                         has_errors = 1;
 195                         continue;
 196                 }
 197
 198                 new = refresh_entry(ce, really);
 199                 if (!new)
 200                         continue;
 201                 if (IS_ERR(new)) {
 202                         if (not_new && PTR_ERR(new) == -ENOENT)
 203                                 continue;
 204                         if (really && PTR_ERR(new) == -EINVAL) {
 205                                 /* If we are doing --really-refresh that
 206                                  * means the index is not valid anymore.
 207                                  */
 208                                 ce->ce_flags &= ~htons(CE_VALID);
 209                                 active_cache_changed = 1;
 210                         }
 211                         if (quiet)
 212                                 continue;
 213                         printf("%s: needs update\n", ce->name);
 214                         has_errors = 1;
 215                         continue;
 216                 }
 217                 active_cache_changed = 1;
 218                 /* You can NOT just free active_cache[i] here, since it
 219                  * might not be necessarily malloc()ed but can also come
 220                  * from mmap(). */
 221                 active_cache[i] = new;
 222         }
 223         return has_errors;
 224 }
 225
 226 /*
 227  * We fundamentally don't like some paths: we don't want
 228  * dot or dot-dot anywhere, and for obvious reasons don't
 229  * want to recurse into ".git" either.
 230  *
 231  * Also, we don't want double slashes or slashes at the
 232  * end that can make pathnames ambiguous.
 233  */
 234 static int verify_dotfile(const char *rest)
 235 {
 236         /*
 237          * The first character was '.', but that
 238          * has already been discarded, we now test
 239          * the rest.
 240          */
 241         switch (*rest) {
 242         /* "." is not allowed */
 243         case '\0': case '/':
 244                 return 0;
 245
 246         /*
 247          * ".git" followed by  NUL or slash is bad. This
 248          * shares the path end test with the ".." case.
 249          */
 250         case 'g':
 251                 if (rest[1] != 'i')
 252                         break;
 253                 if (rest[2] != 't')
 254                         break;
 255                 rest += 2;
 256         /* fallthrough */
 257         case '.':
 258                 if (rest[1] == '\0' || rest[1] == '/')
 259                         return 0;
 260         }
 261         return 1;
 262 }
 263
 264 static int verify_path(const char *path)
 265 {
 266         char c;
 267
 268         goto inside;
 269         for (;;) {
 270                 if (!c)
 271                         return 1;
 272                 if (c == '/') {
 273 inside:
 274                         c = *path++;
 275                         switch (c) {
 276                         default:
 277                                 continue;
 278                         case '/': case '\0':
 279                                 break;
 280                         case '.':
 281                                 if (verify_dotfile(path))
 282                                         continue;
 283                         }
 284                         return 0;
 285                 }
 286                 c = *path++;
 287         }
 288 }
 289
 290 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
 291                          const char *path, int stage)
 292 {
 293         int size, len, option;
 294         struct cache_entry *ce;
 295
 296         if (!verify_path(path))
 297                 return -1;
 298
 299         len = strlen(path);
 300         size = cache_entry_size(len);
 301         ce = xmalloc(size);
 302         memset(ce, 0, size);
 303
 304         memcpy(ce->sha1, sha1, 20);
 305         memcpy(ce->name, path, len);
 306         ce->ce_flags = create_ce_flags(len, stage);
 307         ce->ce_mode = create_ce_mode(mode);
 308         if (assume_unchanged)
 309                 ce->ce_flags |= htons(CE_VALID);
 310         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 311         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 312         if (add_cache_entry(ce, option))
 313                 return error("%s: cannot add to the index - missing --add option?",
 314                              path);
 315         report("add '%s'", path);
 316         return 0;
 317 }
 318
 319 static int chmod_path(int flip, const char *path)
 320 {
 321         int pos;
 322         struct cache_entry *ce;
 323         unsigned int mode;
 324
 325         pos = cache_name_pos(path, strlen(path));
 326         if (pos < 0)
 327                 return -1;
 328         ce = active_cache[pos];
 329         mode = ntohl(ce->ce_mode);
 330         if (!S_ISREG(mode))
 331                 return -1;
 332         switch (flip) {
 333         case '+':
 334                 ce->ce_mode |= htonl(0111); break;
 335         case '-':
 336                 ce->ce_mode &= htonl(~0111); break;
 337         default:
 338                 return -1;
 339         }
 340         active_cache_changed = 1;
 341         return 0;
 342 }
 343
 344 static struct cache_file cache_file;
 345
 346 static void update_one(const char *path, const char *prefix, int prefix_length)
 347 {
 348         const char *p = prefix_path(prefix, prefix_length, path);
 349         if (!verify_path(p)) {
 350                 fprintf(stderr, "Ignoring path %s\n", path);
 351                 return;
 352         }
 353         if (mark_valid_only) {
 354                 if (mark_valid(p))
 355                         die("Unable to mark file %s", path);
 356                 return;
 357         }
 358
 359         if (force_remove) {
 360                 if (remove_file_from_cache(p))
 361                         die("git-update-index: unable to remove %s", path);
 362                 report("remove '%s'", path);
 363                 return;
 364         }
 365         if (add_file_to_cache(p))
 366                 die("Unable to process file %s", path);
 367         report("add '%s'", path);
 368 }
 369
 370 static void read_index_info(int line_termination)
 371 {
 372         struct strbuf buf;
 373         strbuf_init(&buf);
 374         while (1) {
 375                 char *ptr, *tab;
 376                 char *path_name;
 377                 unsigned char sha1[20];
 378                 unsigned int mode;
 379                 int stage;
 380
 381                 /* This reads lines formatted in one of three formats:
 382                  *
 383                  * (1) mode         SP sha1          TAB path
 384                  * The first format is what "git-apply --index-info"
 385                  * reports, and used to reconstruct a partial tree
 386                  * that is used for phony merge base tree when falling
 387                  * back on 3-way merge.
 388                  *
 389                  * (2) mode SP type SP sha1          TAB path
 390                  * The second format is to stuff git-ls-tree output
 391                  * into the index file.
 392                  *
 393                  * (3) mode         SP sha1 SP stage TAB path
 394                  * This format is to put higher order stages into the
 395                  * index file and matches git-ls-files --stage output.
 396                  */
 397                 read_line(&buf, stdin, line_termination);
 398                 if (buf.eof)
 399                         break;
 400
 401                 mode = strtoul(buf.buf, &ptr, 8);
 402                 if (ptr == buf.buf || *ptr != ' ')
 403                         goto bad_line;
 404
 405                 tab = strchr(ptr, '\t');
 406                 if (!tab || tab - ptr < 41)
 407                         goto bad_line;
 408
 409                 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
 410                         stage = tab[-1] - '0';
 411                         ptr = tab + 1; /* point at the head of path */
 412                         tab = tab - 2; /* point at tail of sha1 */
 413                 }
 414                 else {
 415                         stage = 0;
 416                         ptr = tab + 1; /* point at the head of path */
 417                 }
 418
 419                 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
 420                         goto bad_line;
 421
 422                 if (line_termination && ptr[0] == '"')
 423                         path_name = unquote_c_style(ptr, NULL);
 424                 else
 425                         path_name = ptr;
 426
 427                 if (!verify_path(path_name)) {
 428                         fprintf(stderr, "Ignoring path %s\n", path_name);
 429                         if (path_name != ptr)
 430                                 free(path_name);
 431                         continue;
 432                 }
 433
 434                 if (!mode) {
 435                         /* mode == 0 means there is no such path -- remove */
 436                         if (remove_file_from_cache(path_name))
 437                                 die("git-update-index: unable to remove %s",
 438                                     ptr);
 439                 }
 440                 else {
 441                         /* mode ' ' sha1 '\t' name
 442                          * ptr[-1] points at tab,
 443                          * ptr[-41] is at the beginning of sha1
 444                          */
 445                         ptr[-42] = ptr[-1] = 0;
 446                         if (add_cacheinfo(mode, sha1, path_name, stage))
 447                                 die("git-update-index: unable to update %s",
 448                                     path_name);
 449                 }
 450                 if (path_name != ptr)
 451                         free(path_name);
 452                 continue;
 453
 454         bad_line:
 455                 die("malformed index info %s", buf.buf);
 456         }
 457 }
 458
 459 static const char update_index_usage[] =
 460 "git-update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--cacheinfo] [--chmod=(+|-)x] [--info-only] [--force-remove] [--stdin] [--index-info] [--ignore-missing] [-z] [--verbose] [--] <file>...";
 461
 462 int main(int argc, const char **argv)
 463 {
 464         int i, newfd, entries, has_errors = 0, line_termination = '\n';
 465         int allow_options = 1;
 466         int read_from_stdin = 0;
 467         const char *prefix = setup_git_directory();
 468         int prefix_length = prefix ? strlen(prefix) : 0;
 469
 470         git_config(git_default_config);
 471
 472         newfd = hold_index_file_for_update(&cache_file, get_index_file());
 473         if (newfd < 0)
 474                 die("unable to create new cachefile");
 475
 476         entries = read_cache();
 477         if (entries < 0)
 478                 die("cache corrupted");
 479
 480         for (i = 1 ; i < argc; i++) {
 481                 const char *path = argv[i];
 482
 483                 if (allow_options && *path == '-') {
 484                         if (!strcmp(path, "--")) {
 485                                 allow_options = 0;
 486                                 continue;
 487                         }
 488                         if (!strcmp(path, "-q")) {
 489                                 quiet = 1;
 490                                 continue;
 491                         }
 492                         if (!strcmp(path, "--add")) {
 493                                 allow_add = 1;
 494                                 continue;
 495                         }
 496                         if (!strcmp(path, "--replace")) {
 497                                 allow_replace = 1;
 498                                 continue;
 499                         }
 500                         if (!strcmp(path, "--remove")) {
 501                                 allow_remove = 1;
 502                                 continue;
 503                         }
 504                         if (!strcmp(path, "--unmerged")) {
 505                                 allow_unmerged = 1;
 506                                 continue;
 507                         }
 508                         if (!strcmp(path, "--refresh")) {
 509                                 has_errors |= refresh_cache(0);
 510                                 continue;
 511                         }
 512                         if (!strcmp(path, "--really-refresh")) {
 513                                 has_errors |= refresh_cache(1);
 514                                 continue;
 515                         }
 516                         if (!strcmp(path, "--cacheinfo")) {
 517                                 unsigned char sha1[20];
 518                                 unsigned int mode;
 519
 520                                 if (i+3 >= argc)
 521                                         die("git-update-index: --cacheinfo <mode> <sha1> <path>");
 522
 523                                 if ((sscanf(argv[i+1], "%o", &mode) != 1) ||
 524                                     get_sha1_hex(argv[i+2], sha1) ||
 525                                     add_cacheinfo(mode, sha1, argv[i+3], 0))
 526                                         die("git-update-index: --cacheinfo"
 527                                             " cannot add %s", argv[i+3]);
 528                                 i += 3;
 529                                 continue;
 530                         }
 531                         if (!strcmp(path, "--chmod=-x") ||
 532                             !strcmp(path, "--chmod=+x")) {
 533                                 if (argc <= i+1)
 534                                         die("git-update-index: %s <path>", path);
 535                                 if (chmod_path(path[8], argv[++i]))
 536                                         die("git-update-index: %s cannot chmod %s", path, argv[i]);
 537                                 continue;
 538                         }
 539                         if (!strcmp(path, "--assume-unchanged")) {
 540                                 mark_valid_only = MARK_VALID;
 541                                 continue;
 542                         }
 543                         if (!strcmp(path, "--no-assume-unchanged")) {
 544                                 mark_valid_only = UNMARK_VALID;
 545                                 continue;
 546                         }
 547                         if (!strcmp(path, "--info-only")) {
 548                                 info_only = 1;
 549                                 continue;
 550                         }
 551                         if (!strcmp(path, "--force-remove")) {
 552                                 force_remove = 1;
 553                                 continue;
 554                         }
 555                         if (!strcmp(path, "-z")) {
 556                                 line_termination = 0;
 557                                 continue;
 558                         }
 559                         if (!strcmp(path, "--stdin")) {
 560                                 if (i != argc - 1)
 561                                         die("--stdin must be at the end");
 562                                 read_from_stdin = 1;
 563                                 break;
 564                         }
 565                         if (!strcmp(path, "--index-info")) {
 566                                 allow_add = allow_replace = allow_remove = 1;
 567                                 read_index_info(line_termination);
 568                                 continue;
 569                         }
 570                         if (!strcmp(path, "--ignore-missing")) {
 571                                 not_new = 1;
 572                                 continue;
 573                         }
 574                         if (!strcmp(path, "--verbose")) {
 575                                 verbose = 1;
 576                                 continue;
 577                         }
 578                         if (!strcmp(path, "-h") || !strcmp(path, "--help"))
 579                                 usage(update_index_usage);
 580                         die("unknown option %s", path);
 581                 }
 582                 update_one(path, prefix, prefix_length);
 583         }
 584         if (read_from_stdin) {
 585                 struct strbuf buf;
 586                 strbuf_init(&buf);
 587                 while (1) {
 588                         char *path_name;
 589                         read_line(&buf, stdin, line_termination);
 590                         if (buf.eof)
 591                                 break;
 592                         if (line_termination && buf.buf[0] == '"')
 593                                 path_name = unquote_c_style(buf.buf, NULL);
 594                         else
 595                                 path_name = buf.buf;
 596                         update_one(path_name, prefix, prefix_length);
 597                         if (path_name != buf.buf)
 598                                 free(path_name);
 599                 }
 600         }
 601         if (active_cache_changed) {
 602                 if (write_cache(newfd, active_cache, active_nr) ||
 603                     commit_index_file(&cache_file))
 604                         die("Unable to write new cachefile");
 605         }
 606
 607         return has_errors ? 1 : 0;
 608 }