fsck.c

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