git.oblomov.eu Git - git/blob - fsck.c

   1 #include "cache.h"
   2 #include "object-store.h"
   3 #include "repository.h"
   4 #include "object.h"
   5 #include "blob.h"
   6 #include "tree.h"
   7 #include "tree-walk.h"
   8 #include "commit.h"
   9 #include "tag.h"
  10 #include "fsck.h"
  11 #include "refs.h"
  12 #include "url.h"
  13 #include "utf8.h"
  14 #include "decorate.h"
  15 #include "oidset.h"
  16 #include "packfile.h"
  17 #include "submodule-config.h"
  18 #include "config.h"
  19 #include "credential.h"
  20 #include "help.h"
  21
  22 static struct oidset gitmodules_found = OIDSET_INIT;
  23 static struct oidset gitmodules_done = OIDSET_INIT;
  24
  25 #define FSCK_FATAL -1
  26 #define FSCK_INFO -2
  27
  28 #define FOREACH_MSG_ID(FUNC) \
  29         /* fatal errors */ \
  30         FUNC(NUL_IN_HEADER, FATAL) \
  31         FUNC(UNTERMINATED_HEADER, FATAL) \
  32         /* errors */ \
  33         FUNC(BAD_DATE, ERROR) \
  34         FUNC(BAD_DATE_OVERFLOW, ERROR) \
  35         FUNC(BAD_EMAIL, ERROR) \
  36         FUNC(BAD_NAME, ERROR) \
  37         FUNC(BAD_OBJECT_SHA1, ERROR) \
  38         FUNC(BAD_PARENT_SHA1, ERROR) \
  39         FUNC(BAD_TAG_OBJECT, ERROR) \
  40         FUNC(BAD_TIMEZONE, ERROR) \
  41         FUNC(BAD_TREE, ERROR) \
  42         FUNC(BAD_TREE_SHA1, ERROR) \
  43         FUNC(BAD_TYPE, ERROR) \
  44         FUNC(DUPLICATE_ENTRIES, ERROR) \
  45         FUNC(MISSING_AUTHOR, ERROR) \
  46         FUNC(MISSING_COMMITTER, ERROR) \
  47         FUNC(MISSING_EMAIL, ERROR) \
  48         FUNC(MISSING_NAME_BEFORE_EMAIL, ERROR) \
  49         FUNC(MISSING_OBJECT, ERROR) \
  50         FUNC(MISSING_SPACE_BEFORE_DATE, ERROR) \
  51         FUNC(MISSING_SPACE_BEFORE_EMAIL, ERROR) \
  52         FUNC(MISSING_TAG, ERROR) \
  53         FUNC(MISSING_TAG_ENTRY, ERROR) \
  54         FUNC(MISSING_TREE, ERROR) \
  55         FUNC(MISSING_TREE_OBJECT, ERROR) \
  56         FUNC(MISSING_TYPE, ERROR) \
  57         FUNC(MISSING_TYPE_ENTRY, ERROR) \
  58         FUNC(MULTIPLE_AUTHORS, ERROR) \
  59         FUNC(TREE_NOT_SORTED, ERROR) \
  60         FUNC(UNKNOWN_TYPE, ERROR) \
  61         FUNC(ZERO_PADDED_DATE, ERROR) \
  62         FUNC(GITMODULES_MISSING, ERROR) \
  63         FUNC(GITMODULES_BLOB, ERROR) \
  64         FUNC(GITMODULES_LARGE, ERROR) \
  65         FUNC(GITMODULES_NAME, ERROR) \
  66         FUNC(GITMODULES_SYMLINK, ERROR) \
  67         FUNC(GITMODULES_URL, ERROR) \
  68         FUNC(GITMODULES_PATH, ERROR) \
  69         FUNC(GITMODULES_UPDATE, ERROR) \
  70         /* warnings */ \
  71         FUNC(BAD_FILEMODE, WARN) \
  72         FUNC(EMPTY_NAME, WARN) \
  73         FUNC(FULL_PATHNAME, WARN) \
  74         FUNC(HAS_DOT, WARN) \
  75         FUNC(HAS_DOTDOT, WARN) \
  76         FUNC(HAS_DOTGIT, WARN) \
  77         FUNC(NULL_SHA1, WARN) \
  78         FUNC(ZERO_PADDED_FILEMODE, WARN) \
  79         FUNC(NUL_IN_COMMIT, WARN) \
  80         /* infos (reported as warnings, but ignored by default) */ \
  81         FUNC(GITMODULES_PARSE, INFO) \
  82         FUNC(BAD_TAG_NAME, INFO) \
  83         FUNC(MISSING_TAGGER_ENTRY, INFO) \
  84         /* ignored (elevated when requested) */ \
  85         FUNC(EXTRA_HEADER_ENTRY, IGNORE)
  86
  87 #define MSG_ID(id, msg_type) FSCK_MSG_##id,
  88 enum fsck_msg_id {
  89         FOREACH_MSG_ID(MSG_ID)
  90         FSCK_MSG_MAX
  91 };
  92 #undef MSG_ID
  93
  94 #define STR(x) #x
  95 #define MSG_ID(id, msg_type) { STR(id), NULL, NULL, FSCK_##msg_type },
  96 static struct {
  97         const char *id_string;
  98         const char *downcased;
  99         const char *camelcased;
 100         int msg_type;
 101 } msg_id_info[FSCK_MSG_MAX + 1] = {
 102         FOREACH_MSG_ID(MSG_ID)
 103         { NULL, NULL, NULL, -1 }
 104 };
 105 #undef MSG_ID
 106
 107 static void prepare_msg_ids(void)
 108 {
 109         int i;
 110
 111         if (msg_id_info[0].downcased)
 112                 return;
 113
 114         /* convert id_string to lower case, without underscores. */
 115         for (i = 0; i < FSCK_MSG_MAX; i++) {
 116                 const char *p = msg_id_info[i].id_string;
 117                 int len = strlen(p);
 118                 char *q = xmalloc(len);
 119
 120                 msg_id_info[i].downcased = q;
 121                 while (*p)
 122                         if (*p == '_')
 123                                 p++;
 124                         else
 125                                 *(q)++ = tolower(*(p)++);
 126                 *q = '\0';
 127
 128                 p = msg_id_info[i].id_string;
 129                 q = xmalloc(len);
 130                 msg_id_info[i].camelcased = q;
 131                 while (*p) {
 132                         if (*p == '_') {
 133                                 p++;
 134                                 if (*p)
 135                                         *q++ = *p++;
 136                         } else {
 137                                 *q++ = tolower(*p++);
 138                         }
 139                 }
 140                 *q = '\0';
 141         }
 142 }
 143
 144 static int parse_msg_id(const char *text)
 145 {
 146         int i;
 147
 148         prepare_msg_ids();
 149
 150         for (i = 0; i < FSCK_MSG_MAX; i++)
 151                 if (!strcmp(text, msg_id_info[i].downcased))
 152                         return i;
 153
 154         return -1;
 155 }
 156
 157 void list_config_fsck_msg_ids(struct string_list *list, const char *prefix)
 158 {
 159         int i;
 160
 161         prepare_msg_ids();
 162
 163         for (i = 0; i < FSCK_MSG_MAX; i++)
 164                 list_config_item(list, prefix, msg_id_info[i].camelcased);
 165 }
 166
 167 static int fsck_msg_type(enum fsck_msg_id msg_id,
 168         struct fsck_options *options)
 169 {
 170         assert(msg_id >= 0 && msg_id < FSCK_MSG_MAX);
 171
 172         if (!options->msg_type) {
 173                 int msg_type = msg_id_info[msg_id].msg_type;
 174
 175                 if (options->strict && msg_type == FSCK_WARN)
 176                         msg_type = FSCK_ERROR;
 177                 return msg_type;
 178         }
 179
 180         return options->msg_type[msg_id];
 181 }
 182
 183 static int parse_msg_type(const char *str)
 184 {
 185         if (!strcmp(str, "error"))
 186                 return FSCK_ERROR;
 187         else if (!strcmp(str, "warn"))
 188                 return FSCK_WARN;
 189         else if (!strcmp(str, "ignore"))
 190                 return FSCK_IGNORE;
 191         else
 192                 die("Unknown fsck message type: '%s'", str);
 193 }
 194
 195 int is_valid_msg_type(const char *msg_id, const char *msg_type)
 196 {
 197         if (parse_msg_id(msg_id) < 0)
 198                 return 0;
 199         parse_msg_type(msg_type);
 200         return 1;
 201 }
 202
 203 void fsck_set_msg_type(struct fsck_options *options,
 204                        const char *msg_id_str, const char *msg_type_str)
 205 {
 206         int msg_id = parse_msg_id(msg_id_str), msg_type;
 207
 208         if (msg_id < 0)
 209                 die("Unhandled message id: %s", msg_id_str);
 210         msg_type = parse_msg_type(msg_type_str);
 211
 212         if (msg_type != FSCK_ERROR && msg_id_info[msg_id].msg_type == FSCK_FATAL)
 213                 die("Cannot demote %s to %s", msg_id_str, msg_type_str);
 214
 215         if (!options->msg_type) {
 216                 int i;
 217                 int *severity;
 218                 ALLOC_ARRAY(severity, FSCK_MSG_MAX);
 219                 for (i = 0; i < FSCK_MSG_MAX; i++)
 220                         severity[i] = fsck_msg_type(i, options);
 221                 options->msg_type = severity;
 222         }
 223
 224         options->msg_type[msg_id] = msg_type;
 225 }
 226
 227 void fsck_set_msg_types(struct fsck_options *options, const char *values)
 228 {
 229         char *buf = xstrdup(values), *to_free = buf;
 230         int done = 0;
 231
 232         while (!done) {
 233                 int len = strcspn(buf, " ,|"), equal;
 234
 235                 done = !buf[len];
 236                 if (!len) {
 237                         buf++;
 238                         continue;
 239                 }
 240                 buf[len] = '\0';
 241
 242                 for (equal = 0;
 243                      equal < len && buf[equal] != '=' && buf[equal] != ':';
 244                      equal++)
 245                         buf[equal] = tolower(buf[equal]);
 246                 buf[equal] = '\0';
 247
 248                 if (!strcmp(buf, "skiplist")) {
 249                         if (equal == len)
 250                                 die("skiplist requires a path");
 251                         oidset_parse_file(&options->skiplist, buf + equal + 1);
 252                         buf += len + 1;
 253                         continue;
 254                 }
 255
 256                 if (equal == len)
 257                         die("Missing '=': '%s'", buf);
 258
 259                 fsck_set_msg_type(options, buf, buf + equal + 1);
 260                 buf += len + 1;
 261         }
 262         free(to_free);
 263 }
 264
 265 static int object_on_skiplist(struct fsck_options *opts,
 266                               const struct object_id *oid)
 267 {
 268         return opts && oid && oidset_contains(&opts->skiplist, oid);
 269 }
 270
 271 __attribute__((format (printf, 5, 6)))
 272 static int report(struct fsck_options *options,
 273                   const struct object_id *oid, enum object_type object_type,
 274                   enum fsck_msg_id msg_id, const char *fmt, ...)
 275 {
 276         va_list ap;
 277         struct strbuf sb = STRBUF_INIT;
 278         int msg_type = fsck_msg_type(msg_id, options), result;
 279
 280         if (msg_type == FSCK_IGNORE)
 281                 return 0;
 282
 283         if (object_on_skiplist(options, oid))
 284                 return 0;
 285
 286         if (msg_type == FSCK_FATAL)
 287                 msg_type = FSCK_ERROR;
 288         else if (msg_type == FSCK_INFO)
 289                 msg_type = FSCK_WARN;
 290
 291         prepare_msg_ids();
 292         strbuf_addf(&sb, "%s: ", msg_id_info[msg_id].camelcased);
 293
 294         va_start(ap, fmt);
 295         strbuf_vaddf(&sb, fmt, ap);
 296         result = options->error_func(options, oid, object_type,
 297                                      msg_type, sb.buf);
 298         strbuf_release(&sb);
 299         va_end(ap);
 300
 301         return result;
 302 }
 303
 304 void fsck_enable_object_names(struct fsck_options *options)
 305 {
 306         if (!options->object_names)
 307                 options->object_names = kh_init_oid_map();
 308 }
 309
 310 const char *fsck_get_object_name(struct fsck_options *options,
 311                                  const struct object_id *oid)
 312 {
 313         khiter_t pos;
 314         if (!options->object_names)
 315                 return NULL;
 316         pos = kh_get_oid_map(options->object_names, *oid);
 317         if (pos >= kh_end(options->object_names))
 318                 return NULL;
 319         return kh_value(options->object_names, pos);
 320 }
 321
 322 void fsck_put_object_name(struct fsck_options *options,
 323                           const struct object_id *oid,
 324                           const char *fmt, ...)
 325 {
 326         va_list ap;
 327         struct strbuf buf = STRBUF_INIT;
 328         khiter_t pos;
 329         int hashret;
 330
 331         if (!options->object_names)
 332                 return;
 333
 334         pos = kh_put_oid_map(options->object_names, *oid, &hashret);
 335         if (!hashret)
 336                 return;
 337         va_start(ap, fmt);
 338         strbuf_vaddf(&buf, fmt, ap);
 339         kh_value(options->object_names, pos) = strbuf_detach(&buf, NULL);
 340         va_end(ap);
 341 }
 342
 343 const char *fsck_describe_object(struct fsck_options *options,
 344                                  const struct object_id *oid)
 345 {
 346         static struct strbuf bufs[] = {
 347                 STRBUF_INIT, STRBUF_INIT, STRBUF_INIT, STRBUF_INIT
 348         };
 349         static int b = 0;
 350         struct strbuf *buf;
 351         const char *name = fsck_get_object_name(options, oid);
 352
 353         buf = bufs + b;
 354         b = (b + 1) % ARRAY_SIZE(bufs);
 355         strbuf_reset(buf);
 356         strbuf_addstr(buf, oid_to_hex(oid));
 357         if (name)
 358                 strbuf_addf(buf, " (%s)", name);
 359
 360         return buf->buf;
 361 }
 362
 363 static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
 364 {
 365         struct tree_desc desc;
 366         struct name_entry entry;
 367         int res = 0;
 368         const char *name;
 369
 370         if (parse_tree(tree))
 371                 return -1;
 372
 373         name = fsck_get_object_name(options, &tree->object.oid);
 374         if (init_tree_desc_gently(&desc, tree->buffer, tree->size))
 375                 return -1;
 376         while (tree_entry_gently(&desc, &entry)) {
 377                 struct object *obj;
 378                 int result;
 379
 380                 if (S_ISGITLINK(entry.mode))
 381                         continue;
 382
 383                 if (S_ISDIR(entry.mode)) {
 384                         obj = (struct object *)lookup_tree(the_repository, &entry.oid);
 385                         if (name && obj)
 386                                 fsck_put_object_name(options, &entry.oid, "%s%s/",
 387                                                      name, entry.path);
 388                         result = options->walk(obj, OBJ_TREE, data, options);
 389                 }
 390                 else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
 391                         obj = (struct object *)lookup_blob(the_repository, &entry.oid);
 392                         if (name && obj)
 393                                 fsck_put_object_name(options, &entry.oid, "%s%s",
 394                                                      name, entry.path);
 395                         result = options->walk(obj, OBJ_BLOB, data, options);
 396                 }
 397                 else {
 398                         result = error("in tree %s: entry %s has bad mode %.6o",
 399                                        fsck_describe_object(options, &tree->object.oid),
 400                                        entry.path, entry.mode);
 401                 }
 402                 if (result < 0)
 403                         return result;
 404                 if (!res)
 405                         res = result;
 406         }
 407         return res;
 408 }
 409
 410 static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
 411 {
 412         int counter = 0, generation = 0, name_prefix_len = 0;
 413         struct commit_list *parents;
 414         int res;
 415         int result;
 416         const char *name;
 417
 418         if (parse_commit(commit))
 419                 return -1;
 420
 421         name = fsck_get_object_name(options, &commit->object.oid);
 422         if (name)
 423                 fsck_put_object_name(options, get_commit_tree_oid(commit),
 424                                      "%s:", name);
 425
 426         result = options->walk((struct object *)get_commit_tree(commit),
 427                                OBJ_TREE, data, options);
 428         if (result < 0)
 429                 return result;
 430         res = result;
 431
 432         parents = commit->parents;
 433         if (name && parents) {
 434                 int len = strlen(name), power;
 435
 436                 if (len && name[len - 1] == '^') {
 437                         generation = 1;
 438                         name_prefix_len = len - 1;
 439                 }
 440                 else { /* parse ~<generation> suffix */
 441                         for (generation = 0, power = 1;
 442                              len && isdigit(name[len - 1]);
 443                              power *= 10)
 444                                 generation += power * (name[--len] - '0');
 445                         if (power > 1 && len && name[len - 1] == '~')
 446                                 name_prefix_len = len - 1;
 447                         else {
 448                                 /* Maybe a non-first parent, e.g. HEAD^2 */
 449                                 generation = 0;
 450                                 name_prefix_len = len;
 451                         }
 452                 }
 453         }
 454
 455         while (parents) {
 456                 if (name) {
 457                         struct object_id *oid = &parents->item->object.oid;
 458
 459                         if (counter++)
 460                                 fsck_put_object_name(options, oid, "%s^%d",
 461                                                      name, counter);
 462                         else if (generation > 0)
 463                                 fsck_put_object_name(options, oid, "%.*s~%d",
 464                                                      name_prefix_len, name,
 465                                                      generation + 1);
 466                         else
 467                                 fsck_put_object_name(options, oid, "%s^", name);
 468                 }
 469                 result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
 470                 if (result < 0)
 471                         return result;
 472                 if (!res)
 473                         res = result;
 474                 parents = parents->next;
 475         }
 476         return res;
 477 }
 478
 479 static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
 480 {
 481         const char *name = fsck_get_object_name(options, &tag->object.oid);
 482
 483         if (parse_tag(tag))
 484                 return -1;
 485         if (name)
 486                 fsck_put_object_name(options, &tag->tagged->oid, "%s", name);
 487         return options->walk(tag->tagged, OBJ_ANY, data, options);
 488 }
 489
 490 int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
 491 {
 492         if (!obj)
 493                 return -1;
 494
 495         if (obj->type == OBJ_NONE)
 496                 parse_object(the_repository, &obj->oid);
 497
 498         switch (obj->type) {
 499         case OBJ_BLOB:
 500                 return 0;
 501         case OBJ_TREE:
 502                 return fsck_walk_tree((struct tree *)obj, data, options);
 503         case OBJ_COMMIT:
 504                 return fsck_walk_commit((struct commit *)obj, data, options);
 505         case OBJ_TAG:
 506                 return fsck_walk_tag((struct tag *)obj, data, options);
 507         default:
 508                 error("Unknown object type for %s",
 509                       fsck_describe_object(options, &obj->oid));
 510                 return -1;
 511         }
 512 }
 513
 514 struct name_stack {
 515         const char **names;
 516         size_t nr, alloc;
 517 };
 518
 519 static void name_stack_push(struct name_stack *stack, const char *name)
 520 {
 521         ALLOC_GROW(stack->names, stack->nr + 1, stack->alloc);
 522         stack->names[stack->nr++] = name;
 523 }
 524
 525 static const char *name_stack_pop(struct name_stack *stack)
 526 {
 527         return stack->nr ? stack->names[--stack->nr] : NULL;
 528 }
 529
 530 static void name_stack_clear(struct name_stack *stack)
 531 {
 532         FREE_AND_NULL(stack->names);
 533         stack->nr = stack->alloc = 0;
 534 }
 535
 536 /*
 537  * The entries in a tree are ordered in the _path_ order,
 538  * which means that a directory entry is ordered by adding
 539  * a slash to the end of it.
 540  *
 541  * So a directory called "a" is ordered _after_ a file
 542  * called "a.c", because "a/" sorts after "a.c".
 543  */
 544 #define TREE_UNORDERED (-1)
 545 #define TREE_HAS_DUPS  (-2)
 546
 547 static int is_less_than_slash(unsigned char c)
 548 {
 549         return '\0' < c && c < '/';
 550 }
 551
 552 static int verify_ordered(unsigned mode1, const char *name1,
 553                           unsigned mode2, const char *name2,
 554                           struct name_stack *candidates)
 555 {
 556         int len1 = strlen(name1);
 557         int len2 = strlen(name2);
 558         int len = len1 < len2 ? len1 : len2;
 559         unsigned char c1, c2;
 560         int cmp;
 561
 562         cmp = memcmp(name1, name2, len);
 563         if (cmp < 0)
 564                 return 0;
 565         if (cmp > 0)
 566                 return TREE_UNORDERED;
 567
 568         /*
 569          * Ok, the first <len> characters are the same.
 570          * Now we need to order the next one, but turn
 571          * a '\0' into a '/' for a directory entry.
 572          */
 573         c1 = name1[len];
 574         c2 = name2[len];
 575         if (!c1 && !c2)
 576                 /*
 577                  * git-write-tree used to write out a nonsense tree that has
 578                  * entries with the same name, one blob and one tree.  Make
 579                  * sure we do not have duplicate entries.
 580                  */
 581                 return TREE_HAS_DUPS;
 582         if (!c1 && S_ISDIR(mode1))
 583                 c1 = '/';
 584         if (!c2 && S_ISDIR(mode2))
 585                 c2 = '/';
 586
 587         /*
 588          * There can be non-consecutive duplicates due to the implicitly
 589          * added slash, e.g.:
 590          *
 591          *   foo
 592          *   foo.bar
 593          *   foo.bar.baz
 594          *   foo.bar/
 595          *   foo/
 596          *
 597          * Record non-directory candidates (like "foo" and "foo.bar" in
 598          * the example) on a stack and check directory candidates (like
 599          * foo/" and "foo.bar/") against that stack.
 600          */
 601         if (!c1 && is_less_than_slash(c2)) {
 602                 name_stack_push(candidates, name1);
 603         } else if (c2 == '/' && is_less_than_slash(c1)) {
 604                 for (;;) {
 605                         const char *p;
 606                         const char *f_name = name_stack_pop(candidates);
 607
 608                         if (!f_name)
 609                                 break;
 610                         if (!skip_prefix(name2, f_name, &p))
 611                                 continue;
 612                         if (!*p)
 613                                 return TREE_HAS_DUPS;
 614                         if (is_less_than_slash(*p)) {
 615                                 name_stack_push(candidates, f_name);
 616                                 break;
 617                         }
 618                 }
 619         }
 620
 621         return c1 < c2 ? 0 : TREE_UNORDERED;
 622 }
 623
 624 static int fsck_tree(const struct object_id *oid,
 625                      const char *buffer, unsigned long size,
 626                      struct fsck_options *options)
 627 {
 628         int retval = 0;
 629         int has_null_sha1 = 0;
 630         int has_full_path = 0;
 631         int has_empty_name = 0;
 632         int has_dot = 0;
 633         int has_dotdot = 0;
 634         int has_dotgit = 0;
 635         int has_zero_pad = 0;
 636         int has_bad_modes = 0;
 637         int has_dup_entries = 0;
 638         int not_properly_sorted = 0;
 639         struct tree_desc desc;
 640         unsigned o_mode;
 641         const char *o_name;
 642         struct name_stack df_dup_candidates = { NULL };
 643
 644         if (init_tree_desc_gently(&desc, buffer, size)) {
 645                 retval += report(options, oid, OBJ_TREE, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 646                 return retval;
 647         }
 648
 649         o_mode = 0;
 650         o_name = NULL;
 651
 652         while (desc.size) {
 653                 unsigned short mode;
 654                 const char *name, *backslash;
 655                 const struct object_id *oid;
 656
 657                 oid = tree_entry_extract(&desc, &name, &mode);
 658
 659                 has_null_sha1 |= is_null_oid(oid);
 660                 has_full_path |= !!strchr(name, '/');
 661                 has_empty_name |= !*name;
 662                 has_dot |= !strcmp(name, ".");
 663                 has_dotdot |= !strcmp(name, "..");
 664                 has_dotgit |= is_hfs_dotgit(name) || is_ntfs_dotgit(name);
 665                 has_zero_pad |= *(char *)desc.buffer == '0';
 666
 667                 if (is_hfs_dotgitmodules(name) || is_ntfs_dotgitmodules(name)) {
 668                         if (!S_ISLNK(mode))
 669                                 oidset_insert(&gitmodules_found, oid);
 670                         else
 671                                 retval += report(options,
 672                                                  oid, OBJ_TREE,
 673                                                  FSCK_MSG_GITMODULES_SYMLINK,
 674                                                  ".gitmodules is a symbolic link");
 675                 }
 676
 677                 if ((backslash = strchr(name, '\\'))) {
 678                         while (backslash) {
 679                                 backslash++;
 680                                 has_dotgit |= is_ntfs_dotgit(backslash);
 681                                 if (is_ntfs_dotgitmodules(backslash)) {
 682                                         if (!S_ISLNK(mode))
 683                                                 oidset_insert(&gitmodules_found, oid);
 684                                         else
 685                                                 retval += report(options, oid, OBJ_TREE,
 686                                                                  FSCK_MSG_GITMODULES_SYMLINK,
 687                                                                  ".gitmodules is a symbolic link");
 688                                 }
 689                                 backslash = strchr(backslash, '\\');
 690                         }
 691                 }
 692
 693                 if (update_tree_entry_gently(&desc)) {
 694                         retval += report(options, oid, OBJ_TREE, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 695                         break;
 696                 }
 697
 698                 switch (mode) {
 699                 /*
 700                  * Standard modes..
 701                  */
 702                 case S_IFREG | 0755:
 703                 case S_IFREG | 0644:
 704                 case S_IFLNK:
 705                 case S_IFDIR:
 706                 case S_IFGITLINK:
 707                         break;
 708                 /*
 709                  * This is nonstandard, but we had a few of these
 710                  * early on when we honored the full set of mode
 711                  * bits..
 712                  */
 713                 case S_IFREG | 0664:
 714                         if (!options->strict)
 715                                 break;
 716                         /* fallthrough */
 717                 default:
 718                         has_bad_modes = 1;
 719                 }
 720
 721                 if (o_name) {
 722                         switch (verify_ordered(o_mode, o_name, mode, name,
 723                                                &df_dup_candidates)) {
 724                         case TREE_UNORDERED:
 725                                 not_properly_sorted = 1;
 726                                 break;
 727                         case TREE_HAS_DUPS:
 728                                 has_dup_entries = 1;
 729                                 break;
 730                         default:
 731                                 break;
 732                         }
 733                 }
 734
 735                 o_mode = mode;
 736                 o_name = name;
 737         }
 738
 739         name_stack_clear(&df_dup_candidates);
 740
 741         if (has_null_sha1)
 742                 retval += report(options, oid, OBJ_TREE, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
 743         if (has_full_path)
 744                 retval += report(options, oid, OBJ_TREE, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
 745         if (has_empty_name)
 746                 retval += report(options, oid, OBJ_TREE, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
 747         if (has_dot)
 748                 retval += report(options, oid, OBJ_TREE, FSCK_MSG_HAS_DOT, "contains '.'");
 749         if (has_dotdot)
 750                 retval += report(options, oid, OBJ_TREE, FSCK_MSG_HAS_DOTDOT, "contains '..'");
 751         if (has_dotgit)
 752                 retval += report(options, oid, OBJ_TREE, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
 753         if (has_zero_pad)
 754                 retval += report(options, oid, OBJ_TREE, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
 755         if (has_bad_modes)
 756                 retval += report(options, oid, OBJ_TREE, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
 757         if (has_dup_entries)
 758                 retval += report(options, oid, OBJ_TREE, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
 759         if (not_properly_sorted)
 760                 retval += report(options, oid, OBJ_TREE, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
 761         return retval;
 762 }
 763
 764 static int verify_headers(const void *data, unsigned long size,
 765                           const struct object_id *oid, enum object_type type,
 766                           struct fsck_options *options)
 767 {
 768         const char *buffer = (const char *)data;
 769         unsigned long i;
 770
 771         for (i = 0; i < size; i++) {
 772                 switch (buffer[i]) {
 773                 case '\0':
 774                         return report(options, oid, type,
 775                                 FSCK_MSG_NUL_IN_HEADER,
 776                                 "unterminated header: NUL at offset %ld", i);
 777                 case '\n':
 778                         if (i + 1 < size && buffer[i + 1] == '\n')
 779                                 return 0;
 780                 }
 781         }
 782
 783         /*
 784          * We did not find double-LF that separates the header
 785          * and the body.  Not having a body is not a crime but
 786          * we do want to see the terminating LF for the last header
 787          * line.
 788          */
 789         if (size && buffer[size - 1] == '\n')
 790                 return 0;
 791
 792         return report(options, oid, type,
 793                 FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
 794 }
 795
 796 static int fsck_ident(const char **ident,
 797                       const struct object_id *oid, enum object_type type,
 798                       struct fsck_options *options)
 799 {
 800         const char *p = *ident;
 801         char *end;
 802
 803         *ident = strchrnul(*ident, '\n');
 804         if (**ident == '\n')
 805                 (*ident)++;
 806
 807         if (*p == '<')
 808                 return report(options, oid, type, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 809         p += strcspn(p, "<>\n");
 810         if (*p == '>')
 811                 return report(options, oid, type, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
 812         if (*p != '<')
 813                 return report(options, oid, type, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
 814         if (p[-1] != ' ')
 815                 return report(options, oid, type, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 816         p++;
 817         p += strcspn(p, "<>\n");
 818         if (*p != '>')
 819                 return report(options, oid, type, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
 820         p++;
 821         if (*p != ' ')
 822                 return report(options, oid, type, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
 823         p++;
 824         if (*p == '0' && p[1] != ' ')
 825                 return report(options, oid, type, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
 826         if (date_overflows(parse_timestamp(p, &end, 10)))
 827                 return report(options, oid, type, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
 828         if ((end == p || *end != ' '))
 829                 return report(options, oid, type, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
 830         p = end + 1;
 831         if ((*p != '+' && *p != '-') ||
 832             !isdigit(p[1]) ||
 833             !isdigit(p[2]) ||
 834             !isdigit(p[3]) ||
 835             !isdigit(p[4]) ||
 836             (p[5] != '\n'))
 837                 return report(options, oid, type, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
 838         p += 6;
 839         return 0;
 840 }
 841
 842 static int fsck_commit(const struct object_id *oid,
 843                        const char *buffer, unsigned long size,
 844                        struct fsck_options *options)
 845 {
 846         struct object_id tree_oid, parent_oid;
 847         unsigned author_count;
 848         int err;
 849         const char *buffer_begin = buffer;
 850         const char *p;
 851
 852         if (verify_headers(buffer, size, oid, OBJ_COMMIT, options))
 853                 return -1;
 854
 855         if (!skip_prefix(buffer, "tree ", &buffer))
 856                 return report(options, oid, OBJ_COMMIT, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
 857         if (parse_oid_hex(buffer, &tree_oid, &p) || *p != '\n') {
 858                 err = report(options, oid, OBJ_COMMIT, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
 859                 if (err)
 860                         return err;
 861         }
 862         buffer = p + 1;
 863         while (skip_prefix(buffer, "parent ", &buffer)) {
 864                 if (parse_oid_hex(buffer, &parent_oid, &p) || *p != '\n') {
 865                         err = report(options, oid, OBJ_COMMIT, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
 866                         if (err)
 867                                 return err;
 868                 }
 869                 buffer = p + 1;
 870         }
 871         author_count = 0;
 872         while (skip_prefix(buffer, "author ", &buffer)) {
 873                 author_count++;
 874                 err = fsck_ident(&buffer, oid, OBJ_COMMIT, options);
 875                 if (err)
 876                         return err;
 877         }
 878         if (author_count < 1)
 879                 err = report(options, oid, OBJ_COMMIT, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
 880         else if (author_count > 1)
 881                 err = report(options, oid, OBJ_COMMIT, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
 882         if (err)
 883                 return err;
 884         if (!skip_prefix(buffer, "committer ", &buffer))
 885                 return report(options, oid, OBJ_COMMIT, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
 886         err = fsck_ident(&buffer, oid, OBJ_COMMIT, options);
 887         if (err)
 888                 return err;
 889         if (memchr(buffer_begin, '\0', size)) {
 890                 err = report(options, oid, OBJ_COMMIT, FSCK_MSG_NUL_IN_COMMIT,
 891                              "NUL byte in the commit object body");
 892                 if (err)
 893                         return err;
 894         }
 895         return 0;
 896 }
 897
 898 static int fsck_tag(const struct object_id *oid, const char *buffer,
 899                     unsigned long size, struct fsck_options *options)
 900 {
 901         struct object_id tagged_oid;
 902         int tagged_type;
 903         return fsck_tag_standalone(oid, buffer, size, options, &tagged_oid,
 904                                    &tagged_type);
 905 }
 906
 907 int fsck_tag_standalone(const struct object_id *oid, const char *buffer,
 908                         unsigned long size, struct fsck_options *options,
 909                         struct object_id *tagged_oid,
 910                         int *tagged_type)
 911 {
 912         int ret = 0;
 913         char *eol;
 914         struct strbuf sb = STRBUF_INIT;
 915         const char *p;
 916
 917         ret = verify_headers(buffer, size, oid, OBJ_TAG, options);
 918         if (ret)
 919                 goto done;
 920
 921         if (!skip_prefix(buffer, "object ", &buffer)) {
 922                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
 923                 goto done;
 924         }
 925         if (parse_oid_hex(buffer, tagged_oid, &p) || *p != '\n') {
 926                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
 927                 if (ret)
 928                         goto done;
 929         }
 930         buffer = p + 1;
 931
 932         if (!skip_prefix(buffer, "type ", &buffer)) {
 933                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
 934                 goto done;
 935         }
 936         eol = strchr(buffer, '\n');
 937         if (!eol) {
 938                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
 939                 goto done;
 940         }
 941         *tagged_type = type_from_string_gently(buffer, eol - buffer, 1);
 942         if (*tagged_type < 0)
 943                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
 944         if (ret)
 945                 goto done;
 946         buffer = eol + 1;
 947
 948         if (!skip_prefix(buffer, "tag ", &buffer)) {
 949                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
 950                 goto done;
 951         }
 952         eol = strchr(buffer, '\n');
 953         if (!eol) {
 954                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
 955                 goto done;
 956         }
 957         strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
 958         if (check_refname_format(sb.buf, 0)) {
 959                 ret = report(options, oid, OBJ_TAG,
 960                              FSCK_MSG_BAD_TAG_NAME,
 961                              "invalid 'tag' name: %.*s",
 962                              (int)(eol - buffer), buffer);
 963                 if (ret)
 964                         goto done;
 965         }
 966         buffer = eol + 1;
 967
 968         if (!skip_prefix(buffer, "tagger ", &buffer)) {
 969                 /* early tags do not contain 'tagger' lines; warn only */
 970                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
 971                 if (ret)
 972                         goto done;
 973         }
 974         else
 975                 ret = fsck_ident(&buffer, oid, OBJ_TAG, options);
 976         if (!*buffer)
 977                 goto done;
 978
 979         if (!starts_with(buffer, "\n")) {
 980                 /*
 981                  * The verify_headers() check will allow
 982                  * e.g. "[...]tagger <tagger>\nsome
 983                  * garbage\n\nmessage" to pass, thinking "some
 984                  * garbage" could be a custom header. E.g. "mktag"
 985                  * doesn't want any unknown headers.
 986                  */
 987                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_EXTRA_HEADER_ENTRY, "invalid format - extra header(s) after 'tagger'");
 988                 if (ret)
 989                         goto done;
 990         }
 991
 992 done:
 993         strbuf_release(&sb);
 994         return ret;
 995 }
 996
 997 /*
 998  * Like builtin/submodule--helper.c's starts_with_dot_slash, but without
 999  * relying on the platform-dependent is_dir_sep helper.
1000  *
1001  * This is for use in checking whether a submodule URL is interpreted as
1002  * relative to the current directory on any platform, since \ is a
1003  * directory separator on Windows but not on other platforms.
1004  */
1005 static int starts_with_dot_slash(const char *str)
1006 {
1007         return str[0] == '.' && (str[1] == '/' || str[1] == '\\');
1008 }
1009
1010 /*
1011  * Like starts_with_dot_slash, this is a variant of submodule--helper's
1012  * helper of the same name with the twist that it accepts backslash as a
1013  * directory separator even on non-Windows platforms.
1014  */
1015 static int starts_with_dot_dot_slash(const char *str)
1016 {
1017         return str[0] == '.' && starts_with_dot_slash(str + 1);
1018 }
1019
1020 static int submodule_url_is_relative(const char *url)
1021 {
1022         return starts_with_dot_slash(url) || starts_with_dot_dot_slash(url);
1023 }
1024
1025 /*
1026  * Count directory components that a relative submodule URL should chop
1027  * from the remote_url it is to be resolved against.
1028  *
1029  * In other words, this counts "../" components at the start of a
1030  * submodule URL.
1031  *
1032  * Returns the number of directory components to chop and writes a
1033  * pointer to the next character of url after all leading "./" and
1034  * "../" components to out.
1035  */
1036 static int count_leading_dotdots(const char *url, const char **out)
1037 {
1038         int result = 0;
1039         while (1) {
1040                 if (starts_with_dot_dot_slash(url)) {
1041                         result++;
1042                         url += strlen("../");
1043                         continue;
1044                 }
1045                 if (starts_with_dot_slash(url)) {
1046                         url += strlen("./");
1047                         continue;
1048                 }
1049                 *out = url;
1050                 return result;
1051         }
1052 }
1053 /*
1054  * Check whether a transport is implemented by git-remote-curl.
1055  *
1056  * If it is, returns 1 and writes the URL that would be passed to
1057  * git-remote-curl to the "out" parameter.
1058  *
1059  * Otherwise, returns 0 and leaves "out" untouched.
1060  *
1061  * Examples:
1062  *   http::https://example.com/repo.git -> 1, https://example.com/repo.git
1063  *   https://example.com/repo.git -> 1, https://example.com/repo.git
1064  *   git://example.com/repo.git -> 0
1065  *
1066  * This is for use in checking for previously exploitable bugs that
1067  * required a submodule URL to be passed to git-remote-curl.
1068  */
1069 static int url_to_curl_url(const char *url, const char **out)
1070 {
1071         /*
1072          * We don't need to check for case-aliases, "http.exe", and so
1073          * on because in the default configuration, is_transport_allowed
1074          * prevents URLs with those schemes from being cloned
1075          * automatically.
1076          */
1077         if (skip_prefix(url, "http::", out) ||
1078             skip_prefix(url, "https::", out) ||
1079             skip_prefix(url, "ftp::", out) ||
1080             skip_prefix(url, "ftps::", out))
1081                 return 1;
1082         if (starts_with(url, "http://") ||
1083             starts_with(url, "https://") ||
1084             starts_with(url, "ftp://") ||
1085             starts_with(url, "ftps://")) {
1086                 *out = url;
1087                 return 1;
1088         }
1089         return 0;
1090 }
1091
1092 static int check_submodule_url(const char *url)
1093 {
1094         const char *curl_url;
1095
1096         if (looks_like_command_line_option(url))
1097                 return -1;
1098
1099         if (submodule_url_is_relative(url) || starts_with(url, "git://")) {
1100                 char *decoded;
1101                 const char *next;
1102                 int has_nl;
1103
1104                 /*
1105                  * This could be appended to an http URL and url-decoded;
1106                  * check for malicious characters.
1107                  */
1108                 decoded = url_decode(url);
1109                 has_nl = !!strchr(decoded, '\n');
1110
1111                 free(decoded);
1112                 if (has_nl)
1113                         return -1;
1114
1115                 /*
1116                  * URLs which escape their root via "../" can overwrite
1117                  * the host field and previous components, resolving to
1118                  * URLs like https::example.com/submodule.git and
1119                  * https:///example.com/submodule.git that were
1120                  * susceptible to CVE-2020-11008.
1121                  */
1122                 if (count_leading_dotdots(url, &next) > 0 &&
1123                     (*next == ':' || *next == '/'))
1124                         return -1;
1125         }
1126
1127         else if (url_to_curl_url(url, &curl_url)) {
1128                 struct credential c = CREDENTIAL_INIT;
1129                 int ret = 0;
1130                 if (credential_from_url_gently(&c, curl_url, 1) ||
1131                     !*c.host)
1132                         ret = -1;
1133                 credential_clear(&c);
1134                 return ret;
1135         }
1136
1137         return 0;
1138 }
1139
1140 struct fsck_gitmodules_data {
1141         const struct object_id *oid;
1142         struct fsck_options *options;
1143         int ret;
1144 };
1145
1146 static int fsck_gitmodules_fn(const char *var, const char *value, void *vdata)
1147 {
1148         struct fsck_gitmodules_data *data = vdata;
1149         const char *subsection, *key;
1150         size_t subsection_len;
1151         char *name;
1152
1153         if (parse_config_key(var, "submodule", &subsection, &subsection_len, &key) < 0 ||
1154             !subsection)
1155                 return 0;
1156
1157         name = xmemdupz(subsection, subsection_len);
1158         if (check_submodule_name(name) < 0)
1159                 data->ret |= report(data->options,
1160                                     data->oid, OBJ_BLOB,
1161                                     FSCK_MSG_GITMODULES_NAME,
1162                                     "disallowed submodule name: %s",
1163                                     name);
1164         if (!strcmp(key, "url") && value &&
1165             check_submodule_url(value) < 0)
1166                 data->ret |= report(data->options,
1167                                     data->oid, OBJ_BLOB,
1168                                     FSCK_MSG_GITMODULES_URL,
1169                                     "disallowed submodule url: %s",
1170                                     value);
1171         if (!strcmp(key, "path") && value &&
1172             looks_like_command_line_option(value))
1173                 data->ret |= report(data->options,
1174                                     data->oid, OBJ_BLOB,
1175                                     FSCK_MSG_GITMODULES_PATH,
1176                                     "disallowed submodule path: %s",
1177                                     value);
1178         if (!strcmp(key, "update") && value &&
1179             parse_submodule_update_type(value) == SM_UPDATE_COMMAND)
1180                 data->ret |= report(data->options, data->oid, OBJ_BLOB,
1181                                     FSCK_MSG_GITMODULES_UPDATE,
1182                                     "disallowed submodule update setting: %s",
1183                                     value);
1184         free(name);
1185
1186         return 0;
1187 }
1188
1189 static int fsck_blob(const struct object_id *oid, const char *buf,
1190                      unsigned long size, struct fsck_options *options)
1191 {
1192         struct fsck_gitmodules_data data;
1193         struct config_options config_opts = { 0 };
1194
1195         if (!oidset_contains(&gitmodules_found, oid))
1196                 return 0;
1197         oidset_insert(&gitmodules_done, oid);
1198
1199         if (object_on_skiplist(options, oid))
1200                 return 0;
1201
1202         if (!buf) {
1203                 /*
1204                  * A missing buffer here is a sign that the caller found the
1205                  * blob too gigantic to load into memory. Let's just consider
1206                  * that an error.
1207                  */
1208                 return report(options, oid, OBJ_BLOB,
1209                               FSCK_MSG_GITMODULES_LARGE,
1210                               ".gitmodules too large to parse");
1211         }
1212
1213         data.oid = oid;
1214         data.options = options;
1215         data.ret = 0;
1216         config_opts.error_action = CONFIG_ERROR_SILENT;
1217         if (git_config_from_mem(fsck_gitmodules_fn, CONFIG_ORIGIN_BLOB,
1218                                 ".gitmodules", buf, size, &data, &config_opts))
1219                 data.ret |= report(options, oid, OBJ_BLOB,
1220                                    FSCK_MSG_GITMODULES_PARSE,
1221                                    "could not parse gitmodules blob");
1222
1223         return data.ret;
1224 }
1225
1226 int fsck_object(struct object *obj, void *data, unsigned long size,
1227         struct fsck_options *options)
1228 {
1229         if (!obj)
1230                 return report(options, NULL, OBJ_NONE, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
1231
1232         if (obj->type == OBJ_BLOB)
1233                 return fsck_blob(&obj->oid, data, size, options);
1234         if (obj->type == OBJ_TREE)
1235                 return fsck_tree(&obj->oid, data, size, options);
1236         if (obj->type == OBJ_COMMIT)
1237                 return fsck_commit(&obj->oid, data, size, options);
1238         if (obj->type == OBJ_TAG)
1239                 return fsck_tag(&obj->oid, data, size, options);
1240
1241         return report(options, &obj->oid, obj->type,
1242                       FSCK_MSG_UNKNOWN_TYPE,
1243                       "unknown type '%d' (internal fsck error)",
1244                       obj->type);
1245 }
1246
1247 int fsck_error_function(struct fsck_options *o,
1248                         const struct object_id *oid,
1249                         enum object_type object_type,
1250                         int msg_type, const char *message)
1251 {
1252         if (msg_type == FSCK_WARN) {
1253                 warning("object %s: %s", fsck_describe_object(o, oid), message);
1254                 return 0;
1255         }
1256         error("object %s: %s", fsck_describe_object(o, oid), message);
1257         return 1;
1258 }
1259
1260 void register_found_gitmodules(const struct object_id *oid)
1261 {
1262         oidset_insert(&gitmodules_found, oid);
1263 }
1264
1265 int fsck_finish(struct fsck_options *options)
1266 {
1267         int ret = 0;
1268         struct oidset_iter iter;
1269         const struct object_id *oid;
1270
1271         oidset_iter_init(&gitmodules_found, &iter);
1272         while ((oid = oidset_iter_next(&iter))) {
1273                 enum object_type type;
1274                 unsigned long size;
1275                 char *buf;
1276
1277                 if (oidset_contains(&gitmodules_done, oid))
1278                         continue;
1279
1280                 buf = read_object_file(oid, &type, &size);
1281                 if (!buf) {
1282                         if (is_promisor_object(oid))
1283                                 continue;
1284                         ret |= report(options,
1285                                       oid, OBJ_BLOB,
1286                                       FSCK_MSG_GITMODULES_MISSING,
1287                                       "unable to read .gitmodules blob");
1288                         continue;
1289                 }
1290
1291                 if (type == OBJ_BLOB)
1292                         ret |= fsck_blob(oid, buf, size, options);
1293                 else
1294                         ret |= report(options,
1295                                       oid, type,
1296                                       FSCK_MSG_GITMODULES_BLOB,
1297                                       "non-blob found at .gitmodules");
1298                 free(buf);
1299         }
1300
1301
1302         oidset_clear(&gitmodules_found);
1303         oidset_clear(&gitmodules_done);
1304         return ret;
1305 }
1306
1307 int git_fsck_config(const char *var, const char *value, void *cb)
1308 {
1309         struct fsck_options *options = cb;
1310         if (strcmp(var, "fsck.skiplist") == 0) {
1311                 const char *path;
1312                 struct strbuf sb = STRBUF_INIT;
1313
1314                 if (git_config_pathname(&path, var, value))
1315                         return 1;
1316                 strbuf_addf(&sb, "skiplist=%s", path);
1317                 free((char *)path);
1318                 fsck_set_msg_types(options, sb.buf);
1319                 strbuf_release(&sb);
1320                 return 0;
1321         }
1322
1323         if (skip_prefix(var, "fsck.", &var)) {
1324                 fsck_set_msg_type(options, var, value);
1325                 return 0;
1326         }
1327
1328         return git_default_config(var, value, cb);
1329 }