fsck.c

   1 #include "git-compat-util.h"
   2 #include "date.h"
   3 #include "dir.h"
   4 #include "hex.h"
   5 #include "object-store-ll.h"
   6 #include "path.h"
   7 #include "repository.h"
   8 #include "object.h"
   9 #include "attr.h"
  10 #include "blob.h"
  11 #include "tree.h"
  12 #include "tree-walk.h"
  13 #include "commit.h"
  14 #include "tag.h"
  15 #include "fsck.h"
  16 #include "refs.h"
  17 #include "url.h"
  18 #include "utf8.h"
  19 #include "decorate.h"
  20 #include "oidset.h"
  21 #include "packfile.h"
  22 #include "submodule-config.h"
  23 #include "config.h"
  24 #include "credential.h"
  25 #include "help.h"
  26
  27 static ssize_t max_tree_entry_len = 4096;
  28
  29 #define STR(x) #x
  30 #define MSG_ID(id, msg_type) { STR(id), NULL, NULL, FSCK_##msg_type },
  31 static struct {
  32         const char *id_string;
  33         const char *downcased;
  34         const char *camelcased;
  35         enum fsck_msg_type msg_type;
  36 } msg_id_info[FSCK_MSG_MAX + 1] = {
  37         FOREACH_FSCK_MSG_ID(MSG_ID)
  38         { NULL, NULL, NULL, -1 }
  39 };
  40 #undef MSG_ID
  41 #undef STR
  42
  43 static void prepare_msg_ids(void)
  44 {
  45         int i;
  46
  47         if (msg_id_info[0].downcased)
  48                 return;
  49
  50         /* convert id_string to lower case, without underscores. */
  51         for (i = 0; i < FSCK_MSG_MAX; i++) {
  52                 const char *p = msg_id_info[i].id_string;
  53                 int len = strlen(p);
  54                 char *q = xmalloc(len);
  55
  56                 msg_id_info[i].downcased = q;
  57                 while (*p)
  58                         if (*p == '_')
  59                                 p++;
  60                         else
  61                                 *(q)++ = tolower(*(p)++);
  62                 *q = '\0';
  63
  64                 p = msg_id_info[i].id_string;
  65                 q = xmalloc(len);
  66                 msg_id_info[i].camelcased = q;
  67                 while (*p) {
  68                         if (*p == '_') {
  69                                 p++;
  70                                 if (*p)
  71                                         *q++ = *p++;
  72                         } else {
  73                                 *q++ = tolower(*p++);
  74                         }
  75                 }
  76                 *q = '\0';
  77         }
  78 }
  79
  80 static int parse_msg_id(const char *text)
  81 {
  82         int i;
  83
  84         prepare_msg_ids();
  85
  86         for (i = 0; i < FSCK_MSG_MAX; i++)
  87                 if (!strcmp(text, msg_id_info[i].downcased))
  88                         return i;
  89
  90         return -1;
  91 }
  92
  93 void list_config_fsck_msg_ids(struct string_list *list, const char *prefix)
  94 {
  95         int i;
  96
  97         prepare_msg_ids();
  98
  99         for (i = 0; i < FSCK_MSG_MAX; i++)
 100                 list_config_item(list, prefix, msg_id_info[i].camelcased);
 101 }
 102
 103 static enum fsck_msg_type fsck_msg_type(enum fsck_msg_id msg_id,
 104         struct fsck_options *options)
 105 {
 106         assert(msg_id >= 0 && msg_id < FSCK_MSG_MAX);
 107
 108         if (!options->msg_type) {
 109                 enum fsck_msg_type msg_type = msg_id_info[msg_id].msg_type;
 110
 111                 if (options->strict && msg_type == FSCK_WARN)
 112                         msg_type = FSCK_ERROR;
 113                 return msg_type;
 114         }
 115
 116         return options->msg_type[msg_id];
 117 }
 118
 119 static enum fsck_msg_type parse_msg_type(const char *str)
 120 {
 121         if (!strcmp(str, "error"))
 122                 return FSCK_ERROR;
 123         else if (!strcmp(str, "warn"))
 124                 return FSCK_WARN;
 125         else if (!strcmp(str, "ignore"))
 126                 return FSCK_IGNORE;
 127         else
 128                 die("Unknown fsck message type: '%s'", str);
 129 }
 130
 131 int is_valid_msg_type(const char *msg_id, const char *msg_type)
 132 {
 133         if (parse_msg_id(msg_id) < 0)
 134                 return 0;
 135         parse_msg_type(msg_type);
 136         return 1;
 137 }
 138
 139 void fsck_set_msg_type_from_ids(struct fsck_options *options,
 140                                 enum fsck_msg_id msg_id,
 141                                 enum fsck_msg_type msg_type)
 142 {
 143         if (!options->msg_type) {
 144                 int i;
 145                 enum fsck_msg_type *severity;
 146                 ALLOC_ARRAY(severity, FSCK_MSG_MAX);
 147                 for (i = 0; i < FSCK_MSG_MAX; i++)
 148                         severity[i] = fsck_msg_type(i, options);
 149                 options->msg_type = severity;
 150         }
 151
 152         options->msg_type[msg_id] = msg_type;
 153 }
 154
 155 void fsck_set_msg_type(struct fsck_options *options,
 156                        const char *msg_id_str, const char *msg_type_str)
 157 {
 158         int msg_id = parse_msg_id(msg_id_str);
 159         char *to_free = NULL;
 160         enum fsck_msg_type msg_type;
 161
 162         if (msg_id < 0)
 163                 die("Unhandled message id: %s", msg_id_str);
 164
 165         if (msg_id == FSCK_MSG_LARGE_PATHNAME) {
 166                 const char *colon = strchr(msg_type_str, ':');
 167                 if (colon) {
 168                         msg_type_str = to_free =
 169                                 xmemdupz(msg_type_str, colon - msg_type_str);
 170                         colon++;
 171                         if (!git_parse_ssize_t(colon, &max_tree_entry_len))
 172                                 die("unable to parse max tree entry len: %s", colon);
 173                 }
 174         }
 175         msg_type = parse_msg_type(msg_type_str);
 176
 177         if (msg_type != FSCK_ERROR && msg_id_info[msg_id].msg_type == FSCK_FATAL)
 178                 die("Cannot demote %s to %s", msg_id_str, msg_type_str);
 179
 180         fsck_set_msg_type_from_ids(options, msg_id, msg_type);
 181         free(to_free);
 182 }
 183
 184 void fsck_set_msg_types(struct fsck_options *options, const char *values)
 185 {
 186         char *buf = xstrdup(values), *to_free = buf;
 187         int done = 0;
 188
 189         while (!done) {
 190                 int len = strcspn(buf, " ,|"), equal;
 191
 192                 done = !buf[len];
 193                 if (!len) {
 194                         buf++;
 195                         continue;
 196                 }
 197                 buf[len] = '\0';
 198
 199                 for (equal = 0;
 200                      equal < len && buf[equal] != '=' && buf[equal] != ':';
 201                      equal++)
 202                         buf[equal] = tolower(buf[equal]);
 203                 buf[equal] = '\0';
 204
 205                 if (!strcmp(buf, "skiplist")) {
 206                         if (equal == len)
 207                                 die("skiplist requires a path");
 208                         oidset_parse_file(&options->skiplist, buf + equal + 1);
 209                         buf += len + 1;
 210                         continue;
 211                 }
 212
 213                 if (equal == len)
 214                         die("Missing '=': '%s'", buf);
 215
 216                 fsck_set_msg_type(options, buf, buf + equal + 1);
 217                 buf += len + 1;
 218         }
 219         free(to_free);
 220 }
 221
 222 static int object_on_skiplist(struct fsck_options *opts,
 223                               const struct object_id *oid)
 224 {
 225         return opts && oid && oidset_contains(&opts->skiplist, oid);
 226 }
 227
 228 __attribute__((format (printf, 5, 6)))
 229 static int report(struct fsck_options *options,
 230                   const struct object_id *oid, enum object_type object_type,
 231                   enum fsck_msg_id msg_id, const char *fmt, ...)
 232 {
 233         va_list ap;
 234         struct strbuf sb = STRBUF_INIT;
 235         enum fsck_msg_type msg_type = fsck_msg_type(msg_id, options);
 236         int result;
 237
 238         if (msg_type == FSCK_IGNORE)
 239                 return 0;
 240
 241         if (object_on_skiplist(options, oid))
 242                 return 0;
 243
 244         if (msg_type == FSCK_FATAL)
 245                 msg_type = FSCK_ERROR;
 246         else if (msg_type == FSCK_INFO)
 247                 msg_type = FSCK_WARN;
 248
 249         prepare_msg_ids();
 250         strbuf_addf(&sb, "%s: ", msg_id_info[msg_id].camelcased);
 251
 252         va_start(ap, fmt);
 253         strbuf_vaddf(&sb, fmt, ap);
 254         result = options->error_func(options, oid, object_type,
 255                                      msg_type, msg_id, sb.buf);
 256         strbuf_release(&sb);
 257         va_end(ap);
 258
 259         return result;
 260 }
 261
 262 void fsck_enable_object_names(struct fsck_options *options)
 263 {
 264         if (!options->object_names)
 265                 options->object_names = kh_init_oid_map();
 266 }
 267
 268 const char *fsck_get_object_name(struct fsck_options *options,
 269                                  const struct object_id *oid)
 270 {
 271         khiter_t pos;
 272         if (!options->object_names)
 273                 return NULL;
 274         pos = kh_get_oid_map(options->object_names, *oid);
 275         if (pos >= kh_end(options->object_names))
 276                 return NULL;
 277         return kh_value(options->object_names, pos);
 278 }
 279
 280 void fsck_put_object_name(struct fsck_options *options,
 281                           const struct object_id *oid,
 282                           const char *fmt, ...)
 283 {
 284         va_list ap;
 285         struct strbuf buf = STRBUF_INIT;
 286         khiter_t pos;
 287         int hashret;
 288
 289         if (!options->object_names)
 290                 return;
 291
 292         pos = kh_put_oid_map(options->object_names, *oid, &hashret);
 293         if (!hashret)
 294                 return;
 295         va_start(ap, fmt);
 296         strbuf_vaddf(&buf, fmt, ap);
 297         kh_value(options->object_names, pos) = strbuf_detach(&buf, NULL);
 298         va_end(ap);
 299 }
 300
 301 const char *fsck_describe_object(struct fsck_options *options,
 302                                  const struct object_id *oid)
 303 {
 304         static struct strbuf bufs[] = {
 305                 STRBUF_INIT, STRBUF_INIT, STRBUF_INIT, STRBUF_INIT
 306         };
 307         static int b = 0;
 308         struct strbuf *buf;
 309         const char *name = fsck_get_object_name(options, oid);
 310
 311         buf = bufs + b;
 312         b = (b + 1) % ARRAY_SIZE(bufs);
 313         strbuf_reset(buf);
 314         strbuf_addstr(buf, oid_to_hex(oid));
 315         if (name)
 316                 strbuf_addf(buf, " (%s)", name);
 317
 318         return buf->buf;
 319 }
 320
 321 static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
 322 {
 323         struct tree_desc desc;
 324         struct name_entry entry;
 325         int res = 0;
 326         const char *name;
 327
 328         if (parse_tree(tree))
 329                 return -1;
 330
 331         name = fsck_get_object_name(options, &tree->object.oid);
 332         if (init_tree_desc_gently(&desc, tree->buffer, tree->size, 0))
 333                 return -1;
 334         while (tree_entry_gently(&desc, &entry)) {
 335                 struct object *obj;
 336                 int result;
 337
 338                 if (S_ISGITLINK(entry.mode))
 339                         continue;
 340
 341                 if (S_ISDIR(entry.mode)) {
 342                         obj = (struct object *)lookup_tree(the_repository, &entry.oid);
 343                         if (name && obj)
 344                                 fsck_put_object_name(options, &entry.oid, "%s%s/",
 345                                                      name, entry.path);
 346                         result = options->walk(obj, OBJ_TREE, data, options);
 347                 }
 348                 else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
 349                         obj = (struct object *)lookup_blob(the_repository, &entry.oid);
 350                         if (name && obj)
 351                                 fsck_put_object_name(options, &entry.oid, "%s%s",
 352                                                      name, entry.path);
 353                         result = options->walk(obj, OBJ_BLOB, data, options);
 354                 }
 355                 else {
 356                         result = error("in tree %s: entry %s has bad mode %.6o",
 357                                        fsck_describe_object(options, &tree->object.oid),
 358                                        entry.path, entry.mode);
 359                 }
 360                 if (result < 0)
 361                         return result;
 362                 if (!res)
 363                         res = result;
 364         }
 365         return res;
 366 }
 367
 368 static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
 369 {
 370         int counter = 0, generation = 0, name_prefix_len = 0;
 371         struct commit_list *parents;
 372         int res;
 373         int result;
 374         const char *name;
 375
 376         if (repo_parse_commit(the_repository, commit))
 377                 return -1;
 378
 379         name = fsck_get_object_name(options, &commit->object.oid);
 380         if (name)
 381                 fsck_put_object_name(options, get_commit_tree_oid(commit),
 382                                      "%s:", name);
 383
 384         result = options->walk((struct object *) repo_get_commit_tree(the_repository, commit),
 385                                OBJ_TREE, data, options);
 386         if (result < 0)
 387                 return result;
 388         res = result;
 389
 390         parents = commit->parents;
 391         if (name && parents) {
 392                 int len = strlen(name), power;
 393
 394                 if (len && name[len - 1] == '^') {
 395                         generation = 1;
 396                         name_prefix_len = len - 1;
 397                 }
 398                 else { /* parse ~<generation> suffix */
 399                         for (generation = 0, power = 1;
 400                              len && isdigit(name[len - 1]);
 401                              power *= 10)
 402                                 generation += power * (name[--len] - '0');
 403                         if (power > 1 && len && name[len - 1] == '~')
 404                                 name_prefix_len = len - 1;
 405                         else {
 406                                 /* Maybe a non-first parent, e.g. HEAD^2 */
 407                                 generation = 0;
 408                                 name_prefix_len = len;
 409                         }
 410                 }
 411         }
 412
 413         while (parents) {
 414                 if (name) {
 415                         struct object_id *oid = &parents->item->object.oid;
 416
 417                         if (counter++)
 418                                 fsck_put_object_name(options, oid, "%s^%d",
 419                                                      name, counter);
 420                         else if (generation > 0)
 421                                 fsck_put_object_name(options, oid, "%.*s~%d",
 422                                                      name_prefix_len, name,
 423                                                      generation + 1);
 424                         else
 425                                 fsck_put_object_name(options, oid, "%s^", name);
 426                 }
 427                 result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
 428                 if (result < 0)
 429                         return result;
 430                 if (!res)
 431                         res = result;
 432                 parents = parents->next;
 433         }
 434         return res;
 435 }
 436
 437 static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
 438 {
 439         const char *name = fsck_get_object_name(options, &tag->object.oid);
 440
 441         if (parse_tag(tag))
 442                 return -1;
 443         if (name)
 444                 fsck_put_object_name(options, &tag->tagged->oid, "%s", name);
 445         return options->walk(tag->tagged, OBJ_ANY, data, options);
 446 }
 447
 448 int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
 449 {
 450         if (!obj)
 451                 return -1;
 452
 453         if (obj->type == OBJ_NONE)
 454                 parse_object(the_repository, &obj->oid);
 455
 456         switch (obj->type) {
 457         case OBJ_BLOB:
 458                 return 0;
 459         case OBJ_TREE:
 460                 return fsck_walk_tree((struct tree *)obj, data, options);
 461         case OBJ_COMMIT:
 462                 return fsck_walk_commit((struct commit *)obj, data, options);
 463         case OBJ_TAG:
 464                 return fsck_walk_tag((struct tag *)obj, data, options);
 465         default:
 466                 error("Unknown object type for %s",
 467                       fsck_describe_object(options, &obj->oid));
 468                 return -1;
 469         }
 470 }
 471
 472 struct name_stack {
 473         const char **names;
 474         size_t nr, alloc;
 475 };
 476
 477 static void name_stack_push(struct name_stack *stack, const char *name)
 478 {
 479         ALLOC_GROW(stack->names, stack->nr + 1, stack->alloc);
 480         stack->names[stack->nr++] = name;
 481 }
 482
 483 static const char *name_stack_pop(struct name_stack *stack)
 484 {
 485         return stack->nr ? stack->names[--stack->nr] : NULL;
 486 }
 487
 488 static void name_stack_clear(struct name_stack *stack)
 489 {
 490         FREE_AND_NULL(stack->names);
 491         stack->nr = stack->alloc = 0;
 492 }
 493
 494 /*
 495  * The entries in a tree are ordered in the _path_ order,
 496  * which means that a directory entry is ordered by adding
 497  * a slash to the end of it.
 498  *
 499  * So a directory called "a" is ordered _after_ a file
 500  * called "a.c", because "a/" sorts after "a.c".
 501  */
 502 #define TREE_UNORDERED (-1)
 503 #define TREE_HAS_DUPS  (-2)
 504
 505 static int is_less_than_slash(unsigned char c)
 506 {
 507         return '\0' < c && c < '/';
 508 }
 509
 510 static int verify_ordered(unsigned mode1, const char *name1,
 511                           unsigned mode2, const char *name2,
 512                           struct name_stack *candidates)
 513 {
 514         int len1 = strlen(name1);
 515         int len2 = strlen(name2);
 516         int len = len1 < len2 ? len1 : len2;
 517         unsigned char c1, c2;
 518         int cmp;
 519
 520         cmp = memcmp(name1, name2, len);
 521         if (cmp < 0)
 522                 return 0;
 523         if (cmp > 0)
 524                 return TREE_UNORDERED;
 525
 526         /*
 527          * Ok, the first <len> characters are the same.
 528          * Now we need to order the next one, but turn
 529          * a '\0' into a '/' for a directory entry.
 530          */
 531         c1 = name1[len];
 532         c2 = name2[len];
 533         if (!c1 && !c2)
 534                 /*
 535                  * git-write-tree used to write out a nonsense tree that has
 536                  * entries with the same name, one blob and one tree.  Make
 537                  * sure we do not have duplicate entries.
 538                  */
 539                 return TREE_HAS_DUPS;
 540         if (!c1 && S_ISDIR(mode1))
 541                 c1 = '/';
 542         if (!c2 && S_ISDIR(mode2))
 543                 c2 = '/';
 544
 545         /*
 546          * There can be non-consecutive duplicates due to the implicitly
 547          * added slash, e.g.:
 548          *
 549          *   foo
 550          *   foo.bar
 551          *   foo.bar.baz
 552          *   foo.bar/
 553          *   foo/
 554          *
 555          * Record non-directory candidates (like "foo" and "foo.bar" in
 556          * the example) on a stack and check directory candidates (like
 557          * foo/" and "foo.bar/") against that stack.
 558          */
 559         if (!c1 && is_less_than_slash(c2)) {
 560                 name_stack_push(candidates, name1);
 561         } else if (c2 == '/' && is_less_than_slash(c1)) {
 562                 for (;;) {
 563                         const char *p;
 564                         const char *f_name = name_stack_pop(candidates);
 565
 566                         if (!f_name)
 567                                 break;
 568                         if (!skip_prefix(name2, f_name, &p))
 569                                 continue;
 570                         if (!*p)
 571                                 return TREE_HAS_DUPS;
 572                         if (is_less_than_slash(*p)) {
 573                                 name_stack_push(candidates, f_name);
 574                                 break;
 575                         }
 576                 }
 577         }
 578
 579         return c1 < c2 ? 0 : TREE_UNORDERED;
 580 }
 581
 582 static int fsck_tree(const struct object_id *tree_oid,
 583                      const char *buffer, unsigned long size,
 584                      struct fsck_options *options)
 585 {
 586         int retval = 0;
 587         int has_null_sha1 = 0;
 588         int has_full_path = 0;
 589         int has_empty_name = 0;
 590         int has_dot = 0;
 591         int has_dotdot = 0;
 592         int has_dotgit = 0;
 593         int has_zero_pad = 0;
 594         int has_bad_modes = 0;
 595         int has_dup_entries = 0;
 596         int not_properly_sorted = 0;
 597         int has_large_name = 0;
 598         struct tree_desc desc;
 599         unsigned o_mode;
 600         const char *o_name;
 601         struct name_stack df_dup_candidates = { NULL };
 602
 603         if (init_tree_desc_gently(&desc, buffer, size, TREE_DESC_RAW_MODES)) {
 604                 retval += report(options, tree_oid, OBJ_TREE,
 605                                  FSCK_MSG_BAD_TREE,
 606                                  "cannot be parsed as a tree");
 607                 return retval;
 608         }
 609
 610         o_mode = 0;
 611         o_name = NULL;
 612
 613         while (desc.size) {
 614                 unsigned short mode;
 615                 const char *name, *backslash;
 616                 const struct object_id *entry_oid;
 617
 618                 entry_oid = tree_entry_extract(&desc, &name, &mode);
 619
 620                 has_null_sha1 |= is_null_oid(entry_oid);
 621                 has_full_path |= !!strchr(name, '/');
 622                 has_empty_name |= !*name;
 623                 has_dot |= !strcmp(name, ".");
 624                 has_dotdot |= !strcmp(name, "..");
 625                 has_dotgit |= is_hfs_dotgit(name) || is_ntfs_dotgit(name);
 626                 has_zero_pad |= *(char *)desc.buffer == '0';
 627                 has_large_name |= tree_entry_len(&desc.entry) > max_tree_entry_len;
 628
 629                 if (is_hfs_dotgitmodules(name) || is_ntfs_dotgitmodules(name)) {
 630                         if (!S_ISLNK(mode))
 631                                 oidset_insert(&options->gitmodules_found,
 632                                               entry_oid);
 633                         else
 634                                 retval += report(options,
 635                                                  tree_oid, OBJ_TREE,
 636                                                  FSCK_MSG_GITMODULES_SYMLINK,
 637                                                  ".gitmodules is a symbolic link");
 638                 }
 639
 640                 if (is_hfs_dotgitattributes(name) || is_ntfs_dotgitattributes(name)) {
 641                         if (!S_ISLNK(mode))
 642                                 oidset_insert(&options->gitattributes_found,
 643                                               entry_oid);
 644                         else
 645                                 retval += report(options, tree_oid, OBJ_TREE,
 646                                                  FSCK_MSG_GITATTRIBUTES_SYMLINK,
 647                                                  ".gitattributes is a symlink");
 648                 }
 649
 650                 if (S_ISLNK(mode)) {
 651                         if (is_hfs_dotgitignore(name) ||
 652                             is_ntfs_dotgitignore(name))
 653                                 retval += report(options, tree_oid, OBJ_TREE,
 654                                                  FSCK_MSG_GITIGNORE_SYMLINK,
 655                                                  ".gitignore is a symlink");
 656                         if (is_hfs_dotmailmap(name) ||
 657                             is_ntfs_dotmailmap(name))
 658                                 retval += report(options, tree_oid, OBJ_TREE,
 659                                                  FSCK_MSG_MAILMAP_SYMLINK,
 660                                                  ".mailmap is a symlink");
 661                 }
 662
 663                 if ((backslash = strchr(name, '\\'))) {
 664                         while (backslash) {
 665                                 backslash++;
 666                                 has_dotgit |= is_ntfs_dotgit(backslash);
 667                                 if (is_ntfs_dotgitmodules(backslash)) {
 668                                         if (!S_ISLNK(mode))
 669                                                 oidset_insert(&options->gitmodules_found,
 670                                                               entry_oid);
 671                                         else
 672                                                 retval += report(options, tree_oid, OBJ_TREE,
 673                                                                  FSCK_MSG_GITMODULES_SYMLINK,
 674                                                                  ".gitmodules is a symbolic link");
 675                                 }
 676                                 backslash = strchr(backslash, '\\');
 677                         }
 678                 }
 679
 680                 if (update_tree_entry_gently(&desc)) {
 681                         retval += report(options, tree_oid, OBJ_TREE,
 682                                          FSCK_MSG_BAD_TREE,
 683                                          "cannot be parsed as a tree");
 684                         break;
 685                 }
 686
 687                 switch (mode) {
 688                 /*
 689                  * Standard modes..
 690                  */
 691                 case S_IFREG | 0755:
 692                 case S_IFREG | 0644:
 693                 case S_IFLNK:
 694                 case S_IFDIR:
 695                 case S_IFGITLINK:
 696                         break;
 697                 /*
 698                  * This is nonstandard, but we had a few of these
 699                  * early on when we honored the full set of mode
 700                  * bits..
 701                  */
 702                 case S_IFREG | 0664:
 703                         if (!options->strict)
 704                                 break;
 705                         /* fallthrough */
 706                 default:
 707                         has_bad_modes = 1;
 708                 }
 709
 710                 if (o_name) {
 711                         switch (verify_ordered(o_mode, o_name, mode, name,
 712                                                &df_dup_candidates)) {
 713                         case TREE_UNORDERED:
 714                                 not_properly_sorted = 1;
 715                                 break;
 716                         case TREE_HAS_DUPS:
 717                                 has_dup_entries = 1;
 718                                 break;
 719                         default:
 720                                 break;
 721                         }
 722                 }
 723
 724                 o_mode = mode;
 725                 o_name = name;
 726         }
 727
 728         name_stack_clear(&df_dup_candidates);
 729
 730         if (has_null_sha1)
 731                 retval += report(options, tree_oid, OBJ_TREE,
 732                                  FSCK_MSG_NULL_SHA1,
 733                                  "contains entries pointing to null sha1");
 734         if (has_full_path)
 735                 retval += report(options, tree_oid, OBJ_TREE,
 736                                  FSCK_MSG_FULL_PATHNAME,
 737                                  "contains full pathnames");
 738         if (has_empty_name)
 739                 retval += report(options, tree_oid, OBJ_TREE,
 740                                  FSCK_MSG_EMPTY_NAME,
 741                                  "contains empty pathname");
 742         if (has_dot)
 743                 retval += report(options, tree_oid, OBJ_TREE,
 744                                  FSCK_MSG_HAS_DOT,
 745                                  "contains '.'");
 746         if (has_dotdot)
 747                 retval += report(options, tree_oid, OBJ_TREE,
 748                                  FSCK_MSG_HAS_DOTDOT,
 749                                  "contains '..'");
 750         if (has_dotgit)
 751                 retval += report(options, tree_oid, OBJ_TREE,
 752                                  FSCK_MSG_HAS_DOTGIT,
 753                                  "contains '.git'");
 754         if (has_zero_pad)
 755                 retval += report(options, tree_oid, OBJ_TREE,
 756                                  FSCK_MSG_ZERO_PADDED_FILEMODE,
 757                                  "contains zero-padded file modes");
 758         if (has_bad_modes)
 759                 retval += report(options, tree_oid, OBJ_TREE,
 760                                  FSCK_MSG_BAD_FILEMODE,
 761                                  "contains bad file modes");
 762         if (has_dup_entries)
 763                 retval += report(options, tree_oid, OBJ_TREE,
 764                                  FSCK_MSG_DUPLICATE_ENTRIES,
 765                                  "contains duplicate file entries");
 766         if (not_properly_sorted)
 767                 retval += report(options, tree_oid, OBJ_TREE,
 768                                  FSCK_MSG_TREE_NOT_SORTED,
 769                                  "not properly sorted");
 770         if (has_large_name)
 771                 retval += report(options, tree_oid, OBJ_TREE,
 772                                  FSCK_MSG_LARGE_PATHNAME,
 773                                  "contains excessively large pathname");
 774         return retval;
 775 }
 776
 777 /*
 778  * Confirm that the headers of a commit or tag object end in a reasonable way,
 779  * either with the usual "\n\n" separator, or at least with a trailing newline
 780  * on the final header line.
 781  *
 782  * This property is important for the memory safety of our callers. It allows
 783  * them to scan the buffer linewise without constantly checking the remaining
 784  * size as long as:
 785  *
 786  *   - they check that there are bytes left in the buffer at the start of any
 787  *     line (i.e., that the last newline they saw was not the final one we
 788  *     found here)
 789  *
 790  *   - any intra-line scanning they do will stop at a newline, which will worst
 791  *     case hit the newline we found here as the end-of-header. This makes it
 792  *     OK for them to use helpers like parse_oid_hex(), or even skip_prefix().
 793  */
 794 static int verify_headers(const void *data, unsigned long size,
 795                           const struct object_id *oid, enum object_type type,
 796                           struct fsck_options *options)
 797 {
 798         const char *buffer = (const char *)data;
 799         unsigned long i;
 800
 801         for (i = 0; i < size; i++) {
 802                 switch (buffer[i]) {
 803                 case '\0':
 804                         return report(options, oid, type,
 805                                 FSCK_MSG_NUL_IN_HEADER,
 806                                 "unterminated header: NUL at offset %ld", i);
 807                 case '\n':
 808                         if (i + 1 < size && buffer[i + 1] == '\n')
 809                                 return 0;
 810                 }
 811         }
 812
 813         /*
 814          * We did not find double-LF that separates the header
 815          * and the body.  Not having a body is not a crime but
 816          * we do want to see the terminating LF for the last header
 817          * line.
 818          */
 819         if (size && buffer[size - 1] == '\n')
 820                 return 0;
 821
 822         return report(options, oid, type,
 823                 FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
 824 }
 825
 826 static int fsck_ident(const char **ident,
 827                       const struct object_id *oid, enum object_type type,
 828                       struct fsck_options *options)
 829 {
 830         const char *p = *ident;
 831         char *end;
 832
 833         *ident = strchrnul(*ident, '\n');
 834         if (**ident == '\n')
 835                 (*ident)++;
 836
 837         if (*p == '<')
 838                 return report(options, oid, type, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 839         p += strcspn(p, "<>\n");
 840         if (*p == '>')
 841                 return report(options, oid, type, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
 842         if (*p != '<')
 843                 return report(options, oid, type, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
 844         if (p[-1] != ' ')
 845                 return report(options, oid, type, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 846         p++;
 847         p += strcspn(p, "<>\n");
 848         if (*p != '>')
 849                 return report(options, oid, type, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
 850         p++;
 851         if (*p != ' ')
 852                 return report(options, oid, type, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
 853         p++;
 854         /*
 855          * Our timestamp parser is based on the C strto*() functions, which
 856          * will happily eat whitespace, including the newline that is supposed
 857          * to prevent us walking past the end of the buffer. So do our own
 858          * scan, skipping linear whitespace but not newlines, and then
 859          * confirming we found a digit. We _could_ be even more strict here,
 860          * as we really expect only a single space, but since we have
 861          * traditionally allowed extra whitespace, we'll continue to do so.
 862          */
 863         while (*p == ' ' || *p == '\t')
 864                 p++;
 865         if (!isdigit(*p))
 866                 return report(options, oid, type, FSCK_MSG_BAD_DATE,
 867                               "invalid author/committer line - bad date");
 868         if (*p == '0' && p[1] != ' ')
 869                 return report(options, oid, type, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
 870         if (date_overflows(parse_timestamp(p, &end, 10)))
 871                 return report(options, oid, type, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
 872         if ((end == p || *end != ' '))
 873                 return report(options, oid, type, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
 874         p = end + 1;
 875         if ((*p != '+' && *p != '-') ||
 876             !isdigit(p[1]) ||
 877             !isdigit(p[2]) ||
 878             !isdigit(p[3]) ||
 879             !isdigit(p[4]) ||
 880             (p[5] != '\n'))
 881                 return report(options, oid, type, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
 882         p += 6;
 883         return 0;
 884 }
 885
 886 static int fsck_commit(const struct object_id *oid,
 887                        const char *buffer, unsigned long size,
 888                        struct fsck_options *options)
 889 {
 890         struct object_id tree_oid, parent_oid;
 891         unsigned author_count;
 892         int err;
 893         const char *buffer_begin = buffer;
 894         const char *buffer_end = buffer + size;
 895         const char *p;
 896
 897         /*
 898          * We _must_ stop parsing immediately if this reports failure, as the
 899          * memory safety of the rest of the function depends on it. See the
 900          * comment above the definition of verify_headers() for more details.
 901          */
 902         if (verify_headers(buffer, size, oid, OBJ_COMMIT, options))
 903                 return -1;
 904
 905         if (buffer >= buffer_end || !skip_prefix(buffer, "tree ", &buffer))
 906                 return report(options, oid, OBJ_COMMIT, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
 907         if (parse_oid_hex(buffer, &tree_oid, &p) || *p != '\n') {
 908                 err = report(options, oid, OBJ_COMMIT, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
 909                 if (err)
 910                         return err;
 911         }
 912         buffer = p + 1;
 913         while (buffer < buffer_end && skip_prefix(buffer, "parent ", &buffer)) {
 914                 if (parse_oid_hex(buffer, &parent_oid, &p) || *p != '\n') {
 915                         err = report(options, oid, OBJ_COMMIT, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
 916                         if (err)
 917                                 return err;
 918                 }
 919                 buffer = p + 1;
 920         }
 921         author_count = 0;
 922         while (buffer < buffer_end && skip_prefix(buffer, "author ", &buffer)) {
 923                 author_count++;
 924                 err = fsck_ident(&buffer, oid, OBJ_COMMIT, options);
 925                 if (err)
 926                         return err;
 927         }
 928         if (author_count < 1)
 929                 err = report(options, oid, OBJ_COMMIT, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
 930         else if (author_count > 1)
 931                 err = report(options, oid, OBJ_COMMIT, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
 932         if (err)
 933                 return err;
 934         if (buffer >= buffer_end || !skip_prefix(buffer, "committer ", &buffer))
 935                 return report(options, oid, OBJ_COMMIT, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
 936         err = fsck_ident(&buffer, oid, OBJ_COMMIT, options);
 937         if (err)
 938                 return err;
 939         if (memchr(buffer_begin, '\0', size)) {
 940                 err = report(options, oid, OBJ_COMMIT, FSCK_MSG_NUL_IN_COMMIT,
 941                              "NUL byte in the commit object body");
 942                 if (err)
 943                         return err;
 944         }
 945         return 0;
 946 }
 947
 948 static int fsck_tag(const struct object_id *oid, const char *buffer,
 949                     unsigned long size, struct fsck_options *options)
 950 {
 951         struct object_id tagged_oid;
 952         int tagged_type;
 953         return fsck_tag_standalone(oid, buffer, size, options, &tagged_oid,
 954                                    &tagged_type);
 955 }
 956
 957 int fsck_tag_standalone(const struct object_id *oid, const char *buffer,
 958                         unsigned long size, struct fsck_options *options,
 959                         struct object_id *tagged_oid,
 960                         int *tagged_type)
 961 {
 962         int ret = 0;
 963         char *eol;
 964         struct strbuf sb = STRBUF_INIT;
 965         const char *buffer_end = buffer + size;
 966         const char *p;
 967
 968         /*
 969          * We _must_ stop parsing immediately if this reports failure, as the
 970          * memory safety of the rest of the function depends on it. See the
 971          * comment above the definition of verify_headers() for more details.
 972          */
 973         ret = verify_headers(buffer, size, oid, OBJ_TAG, options);
 974         if (ret)
 975                 goto done;
 976
 977         if (buffer >= buffer_end || !skip_prefix(buffer, "object ", &buffer)) {
 978                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
 979                 goto done;
 980         }
 981         if (parse_oid_hex(buffer, tagged_oid, &p) || *p != '\n') {
 982                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
 983                 if (ret)
 984                         goto done;
 985         }
 986         buffer = p + 1;
 987
 988         if (buffer >= buffer_end || !skip_prefix(buffer, "type ", &buffer)) {
 989                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
 990                 goto done;
 991         }
 992         eol = memchr(buffer, '\n', buffer_end - buffer);
 993         if (!eol) {
 994                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
 995                 goto done;
 996         }
 997         *tagged_type = type_from_string_gently(buffer, eol - buffer, 1);
 998         if (*tagged_type < 0)
 999                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
1000         if (ret)
1001                 goto done;
1002         buffer = eol + 1;
1003
1004         if (buffer >= buffer_end || !skip_prefix(buffer, "tag ", &buffer)) {
1005                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
1006                 goto done;
1007         }
1008         eol = memchr(buffer, '\n', buffer_end - buffer);
1009         if (!eol) {
1010                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
1011                 goto done;
1012         }
1013         strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
1014         if (check_refname_format(sb.buf, 0)) {
1015                 ret = report(options, oid, OBJ_TAG,
1016                              FSCK_MSG_BAD_TAG_NAME,
1017                              "invalid 'tag' name: %.*s",
1018                              (int)(eol - buffer), buffer);
1019                 if (ret)
1020                         goto done;
1021         }
1022         buffer = eol + 1;
1023
1024         if (buffer >= buffer_end || !skip_prefix(buffer, "tagger ", &buffer)) {
1025                 /* early tags do not contain 'tagger' lines; warn only */
1026                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
1027                 if (ret)
1028                         goto done;
1029         }
1030         else
1031                 ret = fsck_ident(&buffer, oid, OBJ_TAG, options);
1032
1033         if (buffer < buffer_end && !starts_with(buffer, "\n")) {
1034                 /*
1035                  * The verify_headers() check will allow
1036                  * e.g. "[...]tagger <tagger>\nsome
1037                  * garbage\n\nmessage" to pass, thinking "some
1038                  * garbage" could be a custom header. E.g. "mktag"
1039                  * doesn't want any unknown headers.
1040                  */
1041                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_EXTRA_HEADER_ENTRY, "invalid format - extra header(s) after 'tagger'");
1042                 if (ret)
1043                         goto done;
1044         }
1045
1046 done:
1047         strbuf_release(&sb);
1048         return ret;
1049 }
1050
1051 static int starts_with_dot_slash(const char *const path)
1052 {
1053         return path_match_flags(path, PATH_MATCH_STARTS_WITH_DOT_SLASH |
1054                                 PATH_MATCH_XPLATFORM);
1055 }
1056
1057 static int starts_with_dot_dot_slash(const char *const path)
1058 {
1059         return path_match_flags(path, PATH_MATCH_STARTS_WITH_DOT_DOT_SLASH |
1060                                 PATH_MATCH_XPLATFORM);
1061 }
1062
1063 static int submodule_url_is_relative(const char *url)
1064 {
1065         return starts_with_dot_slash(url) || starts_with_dot_dot_slash(url);
1066 }
1067
1068 /*
1069  * Count directory components that a relative submodule URL should chop
1070  * from the remote_url it is to be resolved against.
1071  *
1072  * In other words, this counts "../" components at the start of a
1073  * submodule URL.
1074  *
1075  * Returns the number of directory components to chop and writes a
1076  * pointer to the next character of url after all leading "./" and
1077  * "../" components to out.
1078  */
1079 static int count_leading_dotdots(const char *url, const char **out)
1080 {
1081         int result = 0;
1082         while (1) {
1083                 if (starts_with_dot_dot_slash(url)) {
1084                         result++;
1085                         url += strlen("../");
1086                         continue;
1087                 }
1088                 if (starts_with_dot_slash(url)) {
1089                         url += strlen("./");
1090                         continue;
1091                 }
1092                 *out = url;
1093                 return result;
1094         }
1095 }
1096 /*
1097  * Check whether a transport is implemented by git-remote-curl.
1098  *
1099  * If it is, returns 1 and writes the URL that would be passed to
1100  * git-remote-curl to the "out" parameter.
1101  *
1102  * Otherwise, returns 0 and leaves "out" untouched.
1103  *
1104  * Examples:
1105  *   http::https://example.com/repo.git -> 1, https://example.com/repo.git
1106  *   https://example.com/repo.git -> 1, https://example.com/repo.git
1107  *   git://example.com/repo.git -> 0
1108  *
1109  * This is for use in checking for previously exploitable bugs that
1110  * required a submodule URL to be passed to git-remote-curl.
1111  */
1112 static int url_to_curl_url(const char *url, const char **out)
1113 {
1114         /*
1115          * We don't need to check for case-aliases, "http.exe", and so
1116          * on because in the default configuration, is_transport_allowed
1117          * prevents URLs with those schemes from being cloned
1118          * automatically.
1119          */
1120         if (skip_prefix(url, "http::", out) ||
1121             skip_prefix(url, "https::", out) ||
1122             skip_prefix(url, "ftp::", out) ||
1123             skip_prefix(url, "ftps::", out))
1124                 return 1;
1125         if (starts_with(url, "http://") ||
1126             starts_with(url, "https://") ||
1127             starts_with(url, "ftp://") ||
1128             starts_with(url, "ftps://")) {
1129                 *out = url;
1130                 return 1;
1131         }
1132         return 0;
1133 }
1134
1135 static int check_submodule_url(const char *url)
1136 {
1137         const char *curl_url;
1138
1139         if (looks_like_command_line_option(url))
1140                 return -1;
1141
1142         if (submodule_url_is_relative(url) || starts_with(url, "git://")) {
1143                 char *decoded;
1144                 const char *next;
1145                 int has_nl;
1146
1147                 /*
1148                  * This could be appended to an http URL and url-decoded;
1149                  * check for malicious characters.
1150                  */
1151                 decoded = url_decode(url);
1152                 has_nl = !!strchr(decoded, '\n');
1153
1154                 free(decoded);
1155                 if (has_nl)
1156                         return -1;
1157
1158                 /*
1159                  * URLs which escape their root via "../" can overwrite
1160                  * the host field and previous components, resolving to
1161                  * URLs like https::example.com/submodule.git and
1162                  * https:///example.com/submodule.git that were
1163                  * susceptible to CVE-2020-11008.
1164                  */
1165                 if (count_leading_dotdots(url, &next) > 0 &&
1166                     (*next == ':' || *next == '/'))
1167                         return -1;
1168         }
1169
1170         else if (url_to_curl_url(url, &curl_url)) {
1171                 struct credential c = CREDENTIAL_INIT;
1172                 int ret = 0;
1173                 if (credential_from_url_gently(&c, curl_url, 1) ||
1174                     !*c.host)
1175                         ret = -1;
1176                 credential_clear(&c);
1177                 return ret;
1178         }
1179
1180         return 0;
1181 }
1182
1183 struct fsck_gitmodules_data {
1184         const struct object_id *oid;
1185         struct fsck_options *options;
1186         int ret;
1187 };
1188
1189 static int fsck_gitmodules_fn(const char *var, const char *value,
1190                               const struct config_context *ctx UNUSED,
1191                               void *vdata)
1192 {
1193         struct fsck_gitmodules_data *data = vdata;
1194         const char *subsection, *key;
1195         size_t subsection_len;
1196         char *name;
1197
1198         if (parse_config_key(var, "submodule", &subsection, &subsection_len, &key) < 0 ||
1199             !subsection)
1200                 return 0;
1201
1202         name = xmemdupz(subsection, subsection_len);
1203         if (check_submodule_name(name) < 0)
1204                 data->ret |= report(data->options,
1205                                     data->oid, OBJ_BLOB,
1206                                     FSCK_MSG_GITMODULES_NAME,
1207                                     "disallowed submodule name: %s",
1208                                     name);
1209         if (!strcmp(key, "url") && value &&
1210             check_submodule_url(value) < 0)
1211                 data->ret |= report(data->options,
1212                                     data->oid, OBJ_BLOB,
1213                                     FSCK_MSG_GITMODULES_URL,
1214                                     "disallowed submodule url: %s",
1215                                     value);
1216         if (!strcmp(key, "path") && value &&
1217             looks_like_command_line_option(value))
1218                 data->ret |= report(data->options,
1219                                     data->oid, OBJ_BLOB,
1220                                     FSCK_MSG_GITMODULES_PATH,
1221                                     "disallowed submodule path: %s",
1222                                     value);
1223         if (!strcmp(key, "update") && value &&
1224             parse_submodule_update_type(value) == SM_UPDATE_COMMAND)
1225                 data->ret |= report(data->options, data->oid, OBJ_BLOB,
1226                                     FSCK_MSG_GITMODULES_UPDATE,
1227                                     "disallowed submodule update setting: %s",
1228                                     value);
1229         free(name);
1230
1231         return 0;
1232 }
1233
1234 static int fsck_blob(const struct object_id *oid, const char *buf,
1235                      unsigned long size, struct fsck_options *options)
1236 {
1237         int ret = 0;
1238
1239         if (object_on_skiplist(options, oid))
1240                 return 0;
1241
1242         if (oidset_contains(&options->gitmodules_found, oid)) {
1243                 struct config_options config_opts = { 0 };
1244                 struct fsck_gitmodules_data data;
1245
1246                 oidset_insert(&options->gitmodules_done, oid);
1247
1248                 if (!buf) {
1249                         /*
1250                          * A missing buffer here is a sign that the caller found the
1251                          * blob too gigantic to load into memory. Let's just consider
1252                          * that an error.
1253                          */
1254                         return report(options, oid, OBJ_BLOB,
1255                                         FSCK_MSG_GITMODULES_LARGE,
1256                                         ".gitmodules too large to parse");
1257                 }
1258
1259                 data.oid = oid;
1260                 data.options = options;
1261                 data.ret = 0;
1262                 config_opts.error_action = CONFIG_ERROR_SILENT;
1263                 if (git_config_from_mem(fsck_gitmodules_fn, CONFIG_ORIGIN_BLOB,
1264                                         ".gitmodules", buf, size, &data,
1265                                         CONFIG_SCOPE_UNKNOWN, &config_opts))
1266                         data.ret |= report(options, oid, OBJ_BLOB,
1267                                         FSCK_MSG_GITMODULES_PARSE,
1268                                         "could not parse gitmodules blob");
1269                 ret |= data.ret;
1270         }
1271
1272         if (oidset_contains(&options->gitattributes_found, oid)) {
1273                 const char *ptr;
1274
1275                 oidset_insert(&options->gitattributes_done, oid);
1276
1277                 if (!buf || size > ATTR_MAX_FILE_SIZE) {
1278                         /*
1279                          * A missing buffer here is a sign that the caller found the
1280                          * blob too gigantic to load into memory. Let's just consider
1281                          * that an error.
1282                          */
1283                         return report(options, oid, OBJ_BLOB,
1284                                         FSCK_MSG_GITATTRIBUTES_LARGE,
1285                                         ".gitattributes too large to parse");
1286                 }
1287
1288                 for (ptr = buf; *ptr; ) {
1289                         const char *eol = strchrnul(ptr, '\n');
1290                         if (eol - ptr >= ATTR_MAX_LINE_LENGTH) {
1291                                 ret |= report(options, oid, OBJ_BLOB,
1292                                               FSCK_MSG_GITATTRIBUTES_LINE_LENGTH,
1293                                               ".gitattributes has too long lines to parse");
1294                                 break;
1295                         }
1296
1297                         ptr = *eol ? eol + 1 : eol;
1298                 }
1299         }
1300
1301         return ret;
1302 }
1303
1304 int fsck_object(struct object *obj, void *data, unsigned long size,
1305         struct fsck_options *options)
1306 {
1307         if (!obj)
1308                 return report(options, NULL, OBJ_NONE, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
1309
1310         return fsck_buffer(&obj->oid, obj->type, data, size, options);
1311 }
1312
1313 int fsck_buffer(const struct object_id *oid, enum object_type type,
1314                 void *data, unsigned long size,
1315                 struct fsck_options *options)
1316 {
1317         if (type == OBJ_BLOB)
1318                 return fsck_blob(oid, data, size, options);
1319         if (type == OBJ_TREE)
1320                 return fsck_tree(oid, data, size, options);
1321         if (type == OBJ_COMMIT)
1322                 return fsck_commit(oid, data, size, options);
1323         if (type == OBJ_TAG)
1324                 return fsck_tag(oid, data, size, options);
1325
1326         return report(options, oid, type,
1327                       FSCK_MSG_UNKNOWN_TYPE,
1328                       "unknown type '%d' (internal fsck error)",
1329                       type);
1330 }
1331
1332 int fsck_error_function(struct fsck_options *o,
1333                         const struct object_id *oid,
1334                         enum object_type object_type UNUSED,
1335                         enum fsck_msg_type msg_type,
1336                         enum fsck_msg_id msg_id UNUSED,
1337                         const char *message)
1338 {
1339         if (msg_type == FSCK_WARN) {
1340                 warning("object %s: %s", fsck_describe_object(o, oid), message);
1341                 return 0;
1342         }
1343         error("object %s: %s", fsck_describe_object(o, oid), message);
1344         return 1;
1345 }
1346
1347 static int fsck_blobs(struct oidset *blobs_found, struct oidset *blobs_done,
1348                       enum fsck_msg_id msg_missing, enum fsck_msg_id msg_type,
1349                       struct fsck_options *options, const char *blob_type)
1350 {
1351         int ret = 0;
1352         struct oidset_iter iter;
1353         const struct object_id *oid;
1354
1355         oidset_iter_init(blobs_found, &iter);
1356         while ((oid = oidset_iter_next(&iter))) {
1357                 enum object_type type;
1358                 unsigned long size;
1359                 char *buf;
1360
1361                 if (oidset_contains(blobs_done, oid))
1362                         continue;
1363
1364                 buf = repo_read_object_file(the_repository, oid, &type, &size);
1365                 if (!buf) {
1366                         if (is_promisor_object(oid))
1367                                 continue;
1368                         ret |= report(options,
1369                                       oid, OBJ_BLOB, msg_missing,
1370                                       "unable to read %s blob", blob_type);
1371                         continue;
1372                 }
1373
1374                 if (type == OBJ_BLOB)
1375                         ret |= fsck_blob(oid, buf, size, options);
1376                 else
1377                         ret |= report(options, oid, type, msg_type,
1378                                       "non-blob found at %s", blob_type);
1379                 free(buf);
1380         }
1381
1382         oidset_clear(blobs_found);
1383         oidset_clear(blobs_done);
1384
1385         return ret;
1386 }
1387
1388 int fsck_finish(struct fsck_options *options)
1389 {
1390         int ret = 0;
1391
1392         ret |= fsck_blobs(&options->gitmodules_found, &options->gitmodules_done,
1393                           FSCK_MSG_GITMODULES_MISSING, FSCK_MSG_GITMODULES_BLOB,
1394                           options, ".gitmodules");
1395         ret |= fsck_blobs(&options->gitattributes_found, &options->gitattributes_done,
1396                           FSCK_MSG_GITATTRIBUTES_MISSING, FSCK_MSG_GITATTRIBUTES_BLOB,
1397                           options, ".gitattributes");
1398
1399         return ret;
1400 }
1401
1402 int git_fsck_config(const char *var, const char *value,
1403                     const struct config_context *ctx, void *cb)
1404 {
1405         struct fsck_options *options = cb;
1406         if (strcmp(var, "fsck.skiplist") == 0) {
1407                 const char *path;
1408                 struct strbuf sb = STRBUF_INIT;
1409
1410                 if (git_config_pathname(&path, var, value))
1411                         return 1;
1412                 strbuf_addf(&sb, "skiplist=%s", path);
1413                 free((char *)path);
1414                 fsck_set_msg_types(options, sb.buf);
1415                 strbuf_release(&sb);
1416                 return 0;
1417         }
1418
1419         if (skip_prefix(var, "fsck.", &var)) {
1420                 fsck_set_msg_type(options, var, value);
1421                 return 0;
1422         }
1423
1424         return git_default_config(var, value, ctx, cb);
1425 }
1426
1427 /*
1428  * Custom error callbacks that are used in more than one place.
1429  */
1430
1431 int fsck_error_cb_print_missing_gitmodules(struct fsck_options *o,
1432                                            const struct object_id *oid,
1433                                            enum object_type object_type,
1434                                            enum fsck_msg_type msg_type,
1435                                            enum fsck_msg_id msg_id,
1436                                            const char *message)
1437 {
1438         if (msg_id == FSCK_MSG_GITMODULES_MISSING) {
1439                 puts(oid_to_hex(oid));
1440                 return 0;
1441         }
1442         return fsck_error_function(o, oid, object_type, msg_type, msg_id, message);
1443 }