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