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         /* In this case, if really is not set, we should leave
 176          * CE_VALID bit alone.  Otherwise, paths marked with
 177          * --no-assume-unchanged (i.e. things to be edited) will
 178          * reacquire CE_VALID bit automatically, which is not
 179          * really what we want.
 180          */
 181         if (!really && assume_unchanged && !(ce->ce_flags & htons(CE_VALID)))
 182                 updated->ce_flags &= ~htons(CE_VALID);
 183
 184         return updated;
 185 }
 186
 187 static int refresh_cache(int really)
 188 {
 189         int i;
 190         int has_errors = 0;
 191
 192         for (i = 0; i < active_nr; i++) {
 193                 struct cache_entry *ce, *new;
 194                 ce = active_cache[i];
 195                 if (ce_stage(ce)) {
 196                         while ((i < active_nr) &&
 197                                ! strcmp(active_cache[i]->name, ce->name))
 198                                 i++;
 199                         i--;
 200                         if (allow_unmerged)
 201                                 continue;
 202                         printf("%s: needs merge\n", ce->name);
 203                         has_errors = 1;
 204                         continue;
 205                 }
 206
 207                 new = refresh_entry(ce, really);
 208                 if (!new)
 209                         continue;
 210                 if (IS_ERR(new)) {
 211                         if (not_new && PTR_ERR(new) == -ENOENT)
 212                                 continue;
 213                         if (really && PTR_ERR(new) == -EINVAL) {
 214                                 /* If we are doing --really-refresh that
 215                                  * means the index is not valid anymore.
 216                                  */
 217                                 ce->ce_flags &= ~htons(CE_VALID);
 218                                 active_cache_changed = 1;
 219                         }
 220                         if (quiet)
 221                                 continue;
 222                         printf("%s: needs update\n", ce->name);
 223                         has_errors = 1;
 224                         continue;
 225                 }
 226                 active_cache_changed = 1;
 227                 /* You can NOT just free active_cache[i] here, since it
 228                  * might not be necessarily malloc()ed but can also come
 229                  * from mmap(). */
 230                 active_cache[i] = new;
 231         }
 232         return has_errors;
 233 }
 234
 235 /*
 236  * We fundamentally don't like some paths: we don't want
 237  * dot or dot-dot anywhere, and for obvious reasons don't
 238  * want to recurse into ".git" either.
 239  *
 240  * Also, we don't want double slashes or slashes at the
 241  * end that can make pathnames ambiguous.
 242  */
 243 static int verify_dotfile(const char *rest)
 244 {
 245         /*
 246          * The first character was '.', but that
 247          * has already been discarded, we now test
 248          * the rest.
 249          */
 250         switch (*rest) {
 251         /* "." is not allowed */
 252         case '\0': case '/':
 253                 return 0;
 254
 255         /*
 256          * ".git" followed by  NUL or slash is bad. This
 257          * shares the path end test with the ".." case.
 258          */
 259         case 'g':
 260                 if (rest[1] != 'i')
 261                         break;
 262                 if (rest[2] != 't')
 263                         break;
 264                 rest += 2;
 265         /* fallthrough */
 266         case '.':
 267                 if (rest[1] == '\0' || rest[1] == '/')
 268                         return 0;
 269         }
 270         return 1;
 271 }
 272
 273 static int verify_path(const char *path)
 274 {
 275         char c;
 276
 277         goto inside;
 278         for (;;) {
 279                 if (!c)
 280                         return 1;
 281                 if (c == '/') {
 282 inside:
 283                         c = *path++;
 284                         switch (c) {
 285                         default:
 286                                 continue;
 287                         case '/': case '\0':
 288                                 break;
 289                         case '.':
 290                                 if (verify_dotfile(path))
 291                                         continue;
 292                         }
 293                         return 0;
 294                 }
 295                 c = *path++;
 296         }
 297 }
 298
 299 static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
 300                          const char *path, int stage)
 301 {
 302         int size, len, option;
 303         struct cache_entry *ce;
 304
 305         if (!verify_path(path))
 306                 return -1;
 307
 308         len = strlen(path);
 309         size = cache_entry_size(len);
 310         ce = xmalloc(size);
 311         memset(ce, 0, size);
 312
 313         memcpy(ce->sha1, sha1, 20);
 314         memcpy(ce->name, path, len);
 315         ce->ce_flags = create_ce_flags(len, stage);
 316         ce->ce_mode = create_ce_mode(mode);
 317         if (assume_unchanged)
 318                 ce->ce_flags |= htons(CE_VALID);
 319         option = allow_add ? ADD_CACHE_OK_TO_ADD : 0;
 320         option |= allow_replace ? ADD_CACHE_OK_TO_REPLACE : 0;
 321         if (add_cache_entry(ce, option))
 322                 return error("%s: cannot add to the index - missing --add option?",
 323                              path);
 324         report("add '%s'", path);
 325         return 0;
 326 }
 327
 328 static int chmod_path(int flip, const char *path)
 329 {
 330         int pos;
 331         struct cache_entry *ce;
 332         unsigned int mode;
 333
 334         pos = cache_name_pos(path, strlen(path));
 335         if (pos < 0)
 336                 return -1;
 337         ce = active_cache[pos];
 338         mode = ntohl(ce->ce_mode);
 339         if (!S_ISREG(mode))
 340                 return -1;
 341         switch (flip) {
 342         case '+':
 343                 ce->ce_mode |= htonl(0111); break;
 344         case '-':
 345                 ce->ce_mode &= htonl(~0111); break;
 346         default:
 347                 return -1;
 348         }
 349         active_cache_changed = 1;
 350         return 0;
 351 }
 352
 353 static struct cache_file cache_file;
 354
 355 static void update_one(const char *path, const char *prefix, int prefix_length)
 356 {
 357         const char *p = prefix_path(prefix, prefix_length, path);
 358         if (!verify_path(p)) {
 359                 fprintf(stderr, "Ignoring path %s\n", path);
 360                 return;
 361         }
 362         if (mark_valid_only) {
 363                 if (mark_valid(p))
 364                         die("Unable to mark file %s", path);
 365                 return;
 366         }
 367
 368         if (force_remove) {
 369                 if (remove_file_from_cache(p))
 370                         die("git-update-index: unable to remove %s", path);
 371                 report("remove '%s'", path);
 372                 return;
 373         }
 374         if (add_file_to_cache(p))
 375                 die("Unable to process file %s", path);
 376         report("add '%s'", path);
 377 }
 378
 379 static void read_index_info(int line_termination)
 380 {
 381         struct strbuf buf;
 382         strbuf_init(&buf);
 383         while (1) {
 384                 char *ptr, *tab;
 385                 char *path_name;
 386                 unsigned char sha1[20];
 387                 unsigned int mode;
 388                 int stage;
 389
 390                 /* This reads lines formatted in one of three formats:
 391                  *
 392                  * (1) mode         SP sha1          TAB path
 393                  * The first format is what "git-apply --index-info"
 394                  * reports, and used to reconstruct a partial tree
 395                  * that is used for phony merge base tree when falling
 396                  * back on 3-way merge.
 397                  *
 398                  * (2) mode SP type SP sha1          TAB path
 399                  * The second format is to stuff git-ls-tree output
 400                  * into the index file.
 401                  *
 402                  * (3) mode         SP sha1 SP stage TAB path
 403                  * This format is to put higher order stages into the
 404                  * index file and matches git-ls-files --stage output.
 405                  */
 406                 read_line(&buf, stdin, line_termination);
 407                 if (buf.eof)
 408                         break;
 409
 410                 mode = strtoul(buf.buf, &ptr, 8);
 411                 if (ptr == buf.buf || *ptr != ' ')
 412                         goto bad_line;
 413
 414                 tab = strchr(ptr, '\t');
 415                 if (!tab || tab - ptr < 41)
 416                         goto bad_line;
 417
 418                 if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
 419                         stage = tab[-1] - '0';
 420                         ptr = tab + 1; /* point at the head of path */
 421                         tab = tab - 2; /* point at tail of sha1 */
 422                 }
 423                 else {
 424                         stage = 0;
 425                         ptr = tab + 1; /* point at the head of path */
 426                 }
 427
 428                 if (get_sha1_hex(tab - 40, sha1) || tab[-41] != ' ')
 429                         goto bad_line;
 430
 431                 if (line_termination && ptr[0] == '"')
 432                         path_name = unquote_c_style(ptr, NULL);
 433                 else
 434                         path_name = ptr;
 435
 436                 if (!verify_path(path_name)) {
 437                         fprintf(stderr, "Ignoring path %s\n", path_name);
 438                         if (path_name != ptr)
 439                                 free(path_name);
 440                         continue;
 441                 }
 442
 443                 if (!mode) {
 444                         /* mode == 0 means there is no such path -- remove */
 445                         if (remove_file_from_cache(path_name))
 446                                 die("git-update-index: unable to remove %s",
 447                                     ptr);
 448                 }
 449                 else {
 450                         /* mode ' ' sha1 '\t' name
 451                          * ptr[-1] points at tab,
 452                          * ptr[-41] is at the beginning of sha1
 453                          */
 454                         ptr[-42] = ptr[-1] = 0;
 455                         if (add_cacheinfo(mode, sha1, path_name, stage))
 456                                 die("git-update-index: unable to update %s",
 457                                     path_name);
 458                 }
 459                 if (path_name != ptr)
 460                         free(path_name);
 461                 continue;
 462
 463         bad_line:
 464                 die("malformed index info %s", buf.buf);
 465         }
 466 }
 467
 468 static const char update_index_usage[] =
 469 "git-update-index [-q] [--add] [--replace] [--remove] [--unmerged] [--refresh] [--cacheinfo] [--chmod=(+|-)x] [--info-only] [--force-remove] [--stdin] [--index-info] [--ignore-missing] [-z] [--verbose] [--] <file>...";
 470
 471 int main(int argc, const char **argv)
 472 {
 473         int i, newfd, entries, has_errors = 0, line_termination = '\n';
 474         int allow_options = 1;
 475         int read_from_stdin = 0;
 476         const char *prefix = setup_git_directory();
 477         int prefix_length = prefix ? strlen(prefix) : 0;
 478
 479         git_config(git_default_config);
 480
 481         newfd = hold_index_file_for_update(&cache_file, get_index_file());
 482         if (newfd < 0)
 483                 die("unable to create new cachefile");
 484
 485         entries = read_cache();
 486         if (entries < 0)
 487                 die("cache corrupted");
 488
 489         for (i = 1 ; i < argc; i++) {
 490                 const char *path = argv[i];
 491
 492                 if (allow_options && *path == '-') {
 493                         if (!strcmp(path, "--")) {
 494                                 allow_options = 0;
 495                                 continue;
 496                         }
 497                         if (!strcmp(path, "-q")) {
 498                                 quiet = 1;
 499                                 continue;
 500                         }
 501                         if (!strcmp(path, "--add")) {
 502                                 allow_add = 1;
 503                                 continue;
 504                         }
 505                         if (!strcmp(path, "--replace")) {
 506                                 allow_replace = 1;
 507                                 continue;
 508                         }
 509                         if (!strcmp(path, "--remove")) {
 510                                 allow_remove = 1;
 511                                 continue;
 512                         }
 513                         if (!strcmp(path, "--unmerged")) {
 514                                 allow_unmerged = 1;
 515                                 continue;
 516                         }
 517                         if (!strcmp(path, "--refresh")) {
 518                                 has_errors |= refresh_cache(0);
 519                                 continue;
 520                         }
 521                         if (!strcmp(path, "--really-refresh")) {
 522                                 has_errors |= refresh_cache(1);
 523                                 continue;
 524                         }
 525                         if (!strcmp(path, "--cacheinfo")) {
 526                                 unsigned char sha1[20];
 527                                 unsigned int mode;
 528
 529                                 if (i+3 >= argc)
 530                                         die("git-update-index: --cacheinfo <mode> <sha1> <path>");
 531
 532                                 if ((sscanf(argv[i+1], "%o", &mode) != 1) ||
 533                                     get_sha1_hex(argv[i+2], sha1) ||
 534                                     add_cacheinfo(mode, sha1, argv[i+3], 0))
 535                                         die("git-update-index: --cacheinfo"
 536                                             " cannot add %s", argv[i+3]);
 537                                 i += 3;
 538                                 continue;
 539                         }
 540                         if (!strcmp(path, "--chmod=-x") ||
 541                             !strcmp(path, "--chmod=+x")) {
 542                                 if (argc <= i+1)
 543                                         die("git-update-index: %s <path>", path);
 544                                 if (chmod_path(path[8], argv[++i]))
 545                                         die("git-update-index: %s cannot chmod %s", path, argv[i]);
 546                                 continue;
 547                         }
 548                         if (!strcmp(path, "--assume-unchanged")) {
 549                                 mark_valid_only = MARK_VALID;
 550                                 continue;
 551                         }
 552                         if (!strcmp(path, "--no-assume-unchanged")) {
 553                                 mark_valid_only = UNMARK_VALID;
 554                                 continue;
 555                         }
 556                         if (!strcmp(path, "--info-only")) {
 557                                 info_only = 1;
 558                                 continue;
 559                         }
 560                         if (!strcmp(path, "--force-remove")) {
 561                                 force_remove = 1;
 562                                 continue;
 563                         }
 564                         if (!strcmp(path, "-z")) {
 565                                 line_termination = 0;
 566                                 continue;
 567                         }
 568                         if (!strcmp(path, "--stdin")) {
 569                                 if (i != argc - 1)
 570                                         die("--stdin must be at the end");
 571                                 read_from_stdin = 1;
 572                                 break;
 573                         }
 574                         if (!strcmp(path, "--index-info")) {
 575                                 allow_add = allow_replace = allow_remove = 1;
 576                                 read_index_info(line_termination);
 577                                 continue;
 578                         }
 579                         if (!strcmp(path, "--ignore-missing")) {
 580                                 not_new = 1;
 581                                 continue;
 582                         }
 583                         if (!strcmp(path, "--verbose")) {
 584                                 verbose = 1;
 585                                 continue;
 586                         }
 587                         if (!strcmp(path, "-h") || !strcmp(path, "--help"))
 588                                 usage(update_index_usage);
 589                         die("unknown option %s", path);
 590                 }
 591                 update_one(path, prefix, prefix_length);
 592         }
 593         if (read_from_stdin) {
 594                 struct strbuf buf;
 595                 strbuf_init(&buf);
 596                 while (1) {
 597                         char *path_name;
 598                         read_line(&buf, stdin, line_termination);
 599                         if (buf.eof)
 600                                 break;
 601                         if (line_termination && buf.buf[0] == '"')
 602                                 path_name = unquote_c_style(buf.buf, NULL);
 603                         else
 604                                 path_name = buf.buf;
 605                         update_one(path_name, prefix, prefix_length);
 606                         if (path_name != buf.buf)
 607                                 free(path_name);
 608                 }
 609         }
 610         if (active_cache_changed) {
 611                 if (write_cache(newfd, active_cache, active_nr) ||
 612                     commit_index_file(&cache_file))
 613                         die("Unable to write new cachefile");
 614         }
 615
 616         return has_errors ? 1 : 0;
 617 }