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->object.oid,
 331                                   tree->buffer, tree->size, 0))
 332                 return -1;
 333         while (tree_entry_gently(&desc, &entry)) {
 334                 struct object *obj;
 335                 int result;
 336
 337                 if (S_ISGITLINK(entry.mode))
 338                         continue;
 339
 340                 if (S_ISDIR(entry.mode)) {
 341                         obj = (struct object *)lookup_tree(the_repository, &entry.oid);
 342                         if (name && obj)
 343                                 fsck_put_object_name(options, &entry.oid, "%s%s/",
 344                                                      name, entry.path);
 345                         result = options->walk(obj, OBJ_TREE, data, options);
 346                 }
 347                 else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
 348                         obj = (struct object *)lookup_blob(the_repository, &entry.oid);
 349                         if (name && obj)
 350                                 fsck_put_object_name(options, &entry.oid, "%s%s",
 351                                                      name, entry.path);
 352                         result = options->walk(obj, OBJ_BLOB, data, options);
 353                 }
 354                 else {
 355                         result = error("in tree %s: entry %s has bad mode %.6o",
 356                                        fsck_describe_object(options, &tree->object.oid),
 357                                        entry.path, entry.mode);
 358                 }
 359                 if (result < 0)
 360                         return result;
 361                 if (!res)
 362                         res = result;
 363         }
 364         return res;
 365 }
 366
 367 static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
 368 {
 369         int counter = 0, generation = 0, name_prefix_len = 0;
 370         struct commit_list *parents;
 371         int res;
 372         int result;
 373         const char *name;
 374
 375         if (repo_parse_commit(the_repository, commit))
 376                 return -1;
 377
 378         name = fsck_get_object_name(options, &commit->object.oid);
 379         if (name)
 380                 fsck_put_object_name(options, get_commit_tree_oid(commit),
 381                                      "%s:", name);
 382
 383         result = options->walk((struct object *) repo_get_commit_tree(the_repository, commit),
 384                                OBJ_TREE, data, options);
 385         if (result < 0)
 386                 return result;
 387         res = result;
 388
 389         parents = commit->parents;
 390         if (name && parents) {
 391                 int len = strlen(name), power;
 392
 393                 if (len && name[len - 1] == '^') {
 394                         generation = 1;
 395                         name_prefix_len = len - 1;
 396                 }
 397                 else { /* parse ~<generation> suffix */
 398                         for (generation = 0, power = 1;
 399                              len && isdigit(name[len - 1]);
 400                              power *= 10)
 401                                 generation += power * (name[--len] - '0');
 402                         if (power > 1 && len && name[len - 1] == '~')
 403                                 name_prefix_len = len - 1;
 404                         else {
 405                                 /* Maybe a non-first parent, e.g. HEAD^2 */
 406                                 generation = 0;
 407                                 name_prefix_len = len;
 408                         }
 409                 }
 410         }
 411
 412         while (parents) {
 413                 if (name) {
 414                         struct object_id *oid = &parents->item->object.oid;
 415
 416                         if (counter++)
 417                                 fsck_put_object_name(options, oid, "%s^%d",
 418                                                      name, counter);
 419                         else if (generation > 0)
 420                                 fsck_put_object_name(options, oid, "%.*s~%d",
 421                                                      name_prefix_len, name,
 422                                                      generation + 1);
 423                         else
 424                                 fsck_put_object_name(options, oid, "%s^", name);
 425                 }
 426                 result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
 427                 if (result < 0)
 428                         return result;
 429                 if (!res)
 430                         res = result;
 431                 parents = parents->next;
 432         }
 433         return res;
 434 }
 435
 436 static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
 437 {
 438         const char *name = fsck_get_object_name(options, &tag->object.oid);
 439
 440         if (parse_tag(tag))
 441                 return -1;
 442         if (name)
 443                 fsck_put_object_name(options, &tag->tagged->oid, "%s", name);
 444         return options->walk(tag->tagged, OBJ_ANY, data, options);
 445 }
 446
 447 int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
 448 {
 449         if (!obj)
 450                 return -1;
 451
 452         if (obj->type == OBJ_NONE)
 453                 parse_object(the_repository, &obj->oid);
 454
 455         switch (obj->type) {
 456         case OBJ_BLOB:
 457                 return 0;
 458         case OBJ_TREE:
 459                 return fsck_walk_tree((struct tree *)obj, data, options);
 460         case OBJ_COMMIT:
 461                 return fsck_walk_commit((struct commit *)obj, data, options);
 462         case OBJ_TAG:
 463                 return fsck_walk_tag((struct tag *)obj, data, options);
 464         default:
 465                 error("Unknown object type for %s",
 466                       fsck_describe_object(options, &obj->oid));
 467                 return -1;
 468         }
 469 }
 470
 471 struct name_stack {
 472         const char **names;
 473         size_t nr, alloc;
 474 };
 475
 476 static void name_stack_push(struct name_stack *stack, const char *name)
 477 {
 478         ALLOC_GROW(stack->names, stack->nr + 1, stack->alloc);
 479         stack->names[stack->nr++] = name;
 480 }
 481
 482 static const char *name_stack_pop(struct name_stack *stack)
 483 {
 484         return stack->nr ? stack->names[--stack->nr] : NULL;
 485 }
 486
 487 static void name_stack_clear(struct name_stack *stack)
 488 {
 489         FREE_AND_NULL(stack->names);
 490         stack->nr = stack->alloc = 0;
 491 }
 492
 493 /*
 494  * The entries in a tree are ordered in the _path_ order,
 495  * which means that a directory entry is ordered by adding
 496  * a slash to the end of it.
 497  *
 498  * So a directory called "a" is ordered _after_ a file
 499  * called "a.c", because "a/" sorts after "a.c".
 500  */
 501 #define TREE_UNORDERED (-1)
 502 #define TREE_HAS_DUPS  (-2)
 503
 504 static int is_less_than_slash(unsigned char c)
 505 {
 506         return '\0' < c && c < '/';
 507 }
 508
 509 static int verify_ordered(unsigned mode1, const char *name1,
 510                           unsigned mode2, const char *name2,
 511                           struct name_stack *candidates)
 512 {
 513         int len1 = strlen(name1);
 514         int len2 = strlen(name2);
 515         int len = len1 < len2 ? len1 : len2;
 516         unsigned char c1, c2;
 517         int cmp;
 518
 519         cmp = memcmp(name1, name2, len);
 520         if (cmp < 0)
 521                 return 0;
 522         if (cmp > 0)
 523                 return TREE_UNORDERED;
 524
 525         /*
 526          * Ok, the first <len> characters are the same.
 527          * Now we need to order the next one, but turn
 528          * a '\0' into a '/' for a directory entry.
 529          */
 530         c1 = name1[len];
 531         c2 = name2[len];
 532         if (!c1 && !c2)
 533                 /*
 534                  * git-write-tree used to write out a nonsense tree that has
 535                  * entries with the same name, one blob and one tree.  Make
 536                  * sure we do not have duplicate entries.
 537                  */
 538                 return TREE_HAS_DUPS;
 539         if (!c1 && S_ISDIR(mode1))
 540                 c1 = '/';
 541         if (!c2 && S_ISDIR(mode2))
 542                 c2 = '/';
 543
 544         /*
 545          * There can be non-consecutive duplicates due to the implicitly
 546          * added slash, e.g.:
 547          *
 548          *   foo
 549          *   foo.bar
 550          *   foo.bar.baz
 551          *   foo.bar/
 552          *   foo/
 553          *
 554          * Record non-directory candidates (like "foo" and "foo.bar" in
 555          * the example) on a stack and check directory candidates (like
 556          * foo/" and "foo.bar/") against that stack.
 557          */
 558         if (!c1 && is_less_than_slash(c2)) {
 559                 name_stack_push(candidates, name1);
 560         } else if (c2 == '/' && is_less_than_slash(c1)) {
 561                 for (;;) {
 562                         const char *p;
 563                         const char *f_name = name_stack_pop(candidates);
 564
 565                         if (!f_name)
 566                                 break;
 567                         if (!skip_prefix(name2, f_name, &p))
 568                                 continue;
 569                         if (!*p)
 570                                 return TREE_HAS_DUPS;
 571                         if (is_less_than_slash(*p)) {
 572                                 name_stack_push(candidates, f_name);
 573                                 break;
 574                         }
 575                 }
 576         }
 577
 578         return c1 < c2 ? 0 : TREE_UNORDERED;
 579 }
 580
 581 static int fsck_tree(const struct object_id *tree_oid,
 582                      const char *buffer, unsigned long size,
 583                      struct fsck_options *options)
 584 {
 585         int retval = 0;
 586         int has_null_sha1 = 0;
 587         int has_full_path = 0;
 588         int has_empty_name = 0;
 589         int has_dot = 0;
 590         int has_dotdot = 0;
 591         int has_dotgit = 0;
 592         int has_zero_pad = 0;
 593         int has_bad_modes = 0;
 594         int has_dup_entries = 0;
 595         int not_properly_sorted = 0;
 596         int has_large_name = 0;
 597         struct tree_desc desc;
 598         unsigned o_mode;
 599         const char *o_name;
 600         struct name_stack df_dup_candidates = { NULL };
 601
 602         if (init_tree_desc_gently(&desc, tree_oid, buffer, size,
 603                                   TREE_DESC_RAW_MODES)) {
 604                 retval += report(options, tree_oid, OBJ_TREE,
 605                                  FSCK_MSG_BAD_TREE,
 606                                  "cannot be parsed as a tree");
 607                 return retval;
 608         }
 609
 610         o_mode = 0;
 611         o_name = NULL;
 612
 613         while (desc.size) {
 614                 unsigned short mode;
 615                 const char *name, *backslash;
 616                 const struct object_id *entry_oid;
 617
 618                 entry_oid = tree_entry_extract(&desc, &name, &mode);
 619
 620                 has_null_sha1 |= is_null_oid(entry_oid);
 621                 has_full_path |= !!strchr(name, '/');
 622                 has_empty_name |= !*name;
 623                 has_dot |= !strcmp(name, ".");
 624                 has_dotdot |= !strcmp(name, "..");
 625                 has_dotgit |= is_hfs_dotgit(name) || is_ntfs_dotgit(name);
 626                 has_zero_pad |= *(char *)desc.buffer == '0';
 627                 has_large_name |= tree_entry_len(&desc.entry) > max_tree_entry_len;
 628
 629                 if (is_hfs_dotgitmodules(name) || is_ntfs_dotgitmodules(name)) {
 630                         if (!S_ISLNK(mode))
 631                                 oidset_insert(&options->gitmodules_found,
 632                                               entry_oid);
 633                         else
 634                                 retval += report(options,
 635                                                  tree_oid, OBJ_TREE,
 636                                                  FSCK_MSG_GITMODULES_SYMLINK,
 637                                                  ".gitmodules is a symbolic link");
 638                 }
 639
 640                 if (is_hfs_dotgitattributes(name) || is_ntfs_dotgitattributes(name)) {
 641                         if (!S_ISLNK(mode))
 642                                 oidset_insert(&options->gitattributes_found,
 643                                               entry_oid);
 644                         else
 645                                 retval += report(options, tree_oid, OBJ_TREE,
 646                                                  FSCK_MSG_GITATTRIBUTES_SYMLINK,
 647                                                  ".gitattributes is a symlink");
 648                 }
 649
 650                 if (S_ISLNK(mode)) {
 651                         if (is_hfs_dotgitignore(name) ||
 652                             is_ntfs_dotgitignore(name))
 653                                 retval += report(options, tree_oid, OBJ_TREE,
 654                                                  FSCK_MSG_GITIGNORE_SYMLINK,
 655                                                  ".gitignore is a symlink");
 656                         if (is_hfs_dotmailmap(name) ||
 657                             is_ntfs_dotmailmap(name))
 658                                 retval += report(options, tree_oid, OBJ_TREE,
 659                                                  FSCK_MSG_MAILMAP_SYMLINK,
 660                                                  ".mailmap is a symlink");
 661                 }
 662
 663                 if ((backslash = strchr(name, '\\'))) {
 664                         while (backslash) {
 665                                 backslash++;
 666                                 has_dotgit |= is_ntfs_dotgit(backslash);
 667                                 if (is_ntfs_dotgitmodules(backslash)) {
 668                                         if (!S_ISLNK(mode))
 669                                                 oidset_insert(&options->gitmodules_found,
 670                                                               entry_oid);
 671                                         else
 672                                                 retval += report(options, tree_oid, OBJ_TREE,
 673                                                                  FSCK_MSG_GITMODULES_SYMLINK,
 674                                                                  ".gitmodules is a symbolic link");
 675                                 }
 676                                 backslash = strchr(backslash, '\\');
 677                         }
 678                 }
 679
 680                 if (update_tree_entry_gently(&desc)) {
 681                         retval += report(options, tree_oid, OBJ_TREE,
 682                                          FSCK_MSG_BAD_TREE,
 683                                          "cannot be parsed as a tree");
 684                         break;
 685                 }
 686
 687                 switch (mode) {
 688                 /*
 689                  * Standard modes..
 690                  */
 691                 case S_IFREG | 0755:
 692                 case S_IFREG | 0644:
 693                 case S_IFLNK:
 694                 case S_IFDIR:
 695                 case S_IFGITLINK:
 696                         break;
 697                 /*
 698                  * This is nonstandard, but we had a few of these
 699                  * early on when we honored the full set of mode
 700                  * bits..
 701                  */
 702                 case S_IFREG | 0664:
 703                         if (!options->strict)
 704                                 break;
 705                         /* fallthrough */
 706                 default:
 707                         has_bad_modes = 1;
 708                 }
 709
 710                 if (o_name) {
 711                         switch (verify_ordered(o_mode, o_name, mode, name,
 712                                                &df_dup_candidates)) {
 713                         case TREE_UNORDERED:
 714                                 not_properly_sorted = 1;
 715                                 break;
 716                         case TREE_HAS_DUPS:
 717                                 has_dup_entries = 1;
 718                                 break;
 719                         default:
 720                                 break;
 721                         }
 722                 }
 723
 724                 o_mode = mode;
 725                 o_name = name;
 726         }
 727
 728         name_stack_clear(&df_dup_candidates);
 729
 730         if (has_null_sha1)
 731                 retval += report(options, tree_oid, OBJ_TREE,
 732                                  FSCK_MSG_NULL_SHA1,
 733                                  "contains entries pointing to null sha1");
 734         if (has_full_path)
 735                 retval += report(options, tree_oid, OBJ_TREE,
 736                                  FSCK_MSG_FULL_PATHNAME,
 737                                  "contains full pathnames");
 738         if (has_empty_name)
 739                 retval += report(options, tree_oid, OBJ_TREE,
 740                                  FSCK_MSG_EMPTY_NAME,
 741                                  "contains empty pathname");
 742         if (has_dot)
 743                 retval += report(options, tree_oid, OBJ_TREE,
 744                                  FSCK_MSG_HAS_DOT,
 745                                  "contains '.'");
 746         if (has_dotdot)
 747                 retval += report(options, tree_oid, OBJ_TREE,
 748                                  FSCK_MSG_HAS_DOTDOT,
 749                                  "contains '..'");
 750         if (has_dotgit)
 751                 retval += report(options, tree_oid, OBJ_TREE,
 752                                  FSCK_MSG_HAS_DOTGIT,
 753                                  "contains '.git'");
 754         if (has_zero_pad)
 755                 retval += report(options, tree_oid, OBJ_TREE,
 756                                  FSCK_MSG_ZERO_PADDED_FILEMODE,
 757                                  "contains zero-padded file modes");
 758         if (has_bad_modes)
 759                 retval += report(options, tree_oid, OBJ_TREE,
 760                                  FSCK_MSG_BAD_FILEMODE,
 761                                  "contains bad file modes");
 762         if (has_dup_entries)
 763                 retval += report(options, tree_oid, OBJ_TREE,
 764                                  FSCK_MSG_DUPLICATE_ENTRIES,
 765                                  "contains duplicate file entries");
 766         if (not_properly_sorted)
 767                 retval += report(options, tree_oid, OBJ_TREE,
 768                                  FSCK_MSG_TREE_NOT_SORTED,
 769                                  "not properly sorted");
 770         if (has_large_name)
 771                 retval += report(options, tree_oid, OBJ_TREE,
 772                                  FSCK_MSG_LARGE_PATHNAME,
 773                                  "contains excessively large pathname");
 774         return retval;
 775 }
 776
 777 /*
 778  * Confirm that the headers of a commit or tag object end in a reasonable way,
 779  * either with the usual "\n\n" separator, or at least with a trailing newline
 780  * on the final header line.
 781  *
 782  * This property is important for the memory safety of our callers. It allows
 783  * them to scan the buffer linewise without constantly checking the remaining
 784  * size as long as:
 785  *
 786  *   - they check that there are bytes left in the buffer at the start of any
 787  *     line (i.e., that the last newline they saw was not the final one we
 788  *     found here)
 789  *
 790  *   - any intra-line scanning they do will stop at a newline, which will worst
 791  *     case hit the newline we found here as the end-of-header. This makes it
 792  *     OK for them to use helpers like parse_oid_hex(), or even skip_prefix().
 793  */
 794 static int verify_headers(const void *data, unsigned long size,
 795                           const struct object_id *oid, enum object_type type,
 796                           struct fsck_options *options)
 797 {
 798         const char *buffer = (const char *)data;
 799         unsigned long i;
 800
 801         for (i = 0; i < size; i++) {
 802                 switch (buffer[i]) {
 803                 case '\0':
 804                         return report(options, oid, type,
 805                                 FSCK_MSG_NUL_IN_HEADER,
 806                                 "unterminated header: NUL at offset %ld", i);
 807                 case '\n':
 808                         if (i + 1 < size && buffer[i + 1] == '\n')
 809                                 return 0;
 810                 }
 811         }
 812
 813         /*
 814          * We did not find double-LF that separates the header
 815          * and the body.  Not having a body is not a crime but
 816          * we do want to see the terminating LF for the last header
 817          * line.
 818          */
 819         if (size && buffer[size - 1] == '\n')
 820                 return 0;
 821
 822         return report(options, oid, type,
 823                 FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
 824 }
 825
 826 static int fsck_ident(const char **ident,
 827                       const struct object_id *oid, enum object_type type,
 828                       struct fsck_options *options)
 829 {
 830         const char *p = *ident;
 831         char *end;
 832
 833         *ident = strchrnul(*ident, '\n');
 834         if (**ident == '\n')
 835                 (*ident)++;
 836
 837         if (*p == '<')
 838                 return report(options, oid, type, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 839         p += strcspn(p, "<>\n");
 840         if (*p == '>')
 841                 return report(options, oid, type, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
 842         if (*p != '<')
 843                 return report(options, oid, type, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
 844         if (p[-1] != ' ')
 845                 return report(options, oid, type, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 846         p++;
 847         p += strcspn(p, "<>\n");
 848         if (*p != '>')
 849                 return report(options, oid, type, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
 850         p++;
 851         if (*p != ' ')
 852                 return report(options, oid, type, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
 853         p++;
 854         /*
 855          * Our timestamp parser is based on the C strto*() functions, which
 856          * will happily eat whitespace, including the newline that is supposed
 857          * to prevent us walking past the end of the buffer. So do our own
 858          * scan, skipping linear whitespace but not newlines, and then
 859          * confirming we found a digit. We _could_ be even more strict here,
 860          * as we really expect only a single space, but since we have
 861          * traditionally allowed extra whitespace, we'll continue to do so.
 862          */
 863         while (*p == ' ' || *p == '\t')
 864                 p++;
 865         if (!isdigit(*p))
 866                 return report(options, oid, type, FSCK_MSG_BAD_DATE,
 867                               "invalid author/committer line - bad date");
 868         if (*p == '0' && p[1] != ' ')
 869                 return report(options, oid, type, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
 870         if (date_overflows(parse_timestamp(p, &end, 10)))
 871                 return report(options, oid, type, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
 872         if ((end == p || *end != ' '))
 873                 return report(options, oid, type, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
 874         p = end + 1;
 875         if ((*p != '+' && *p != '-') ||
 876             !isdigit(p[1]) ||
 877             !isdigit(p[2]) ||
 878             !isdigit(p[3]) ||
 879             !isdigit(p[4]) ||
 880             (p[5] != '\n'))
 881                 return report(options, oid, type, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
 882         p += 6;
 883         return 0;
 884 }
 885
 886 static int fsck_commit(const struct object_id *oid,
 887                        const char *buffer, unsigned long size,
 888                        struct fsck_options *options)
 889 {
 890         struct object_id tree_oid, parent_oid;
 891         unsigned author_count;
 892         int err;
 893         const char *buffer_begin = buffer;
 894         const char *buffer_end = buffer + size;
 895         const char *p;
 896
 897         /*
 898          * We _must_ stop parsing immediately if this reports failure, as the
 899          * memory safety of the rest of the function depends on it. See the
 900          * comment above the definition of verify_headers() for more details.
 901          */
 902         if (verify_headers(buffer, size, oid, OBJ_COMMIT, options))
 903                 return -1;
 904
 905         if (buffer >= buffer_end || !skip_prefix(buffer, "tree ", &buffer))
 906                 return report(options, oid, OBJ_COMMIT, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
 907         if (parse_oid_hex(buffer, &tree_oid, &p) || *p != '\n') {
 908                 err = report(options, oid, OBJ_COMMIT, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
 909                 if (err)
 910                         return err;
 911         }
 912         buffer = p + 1;
 913         while (buffer < buffer_end && skip_prefix(buffer, "parent ", &buffer)) {
 914                 if (parse_oid_hex(buffer, &parent_oid, &p) || *p != '\n') {
 915                         err = report(options, oid, OBJ_COMMIT, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
 916                         if (err)
 917                                 return err;
 918                 }
 919                 buffer = p + 1;
 920         }
 921         author_count = 0;
 922         while (buffer < buffer_end && skip_prefix(buffer, "author ", &buffer)) {
 923                 author_count++;
 924                 err = fsck_ident(&buffer, oid, OBJ_COMMIT, options);
 925                 if (err)
 926                         return err;
 927         }
 928         if (author_count < 1)
 929                 err = report(options, oid, OBJ_COMMIT, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
 930         else if (author_count > 1)
 931                 err = report(options, oid, OBJ_COMMIT, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
 932         if (err)
 933                 return err;
 934         if (buffer >= buffer_end || !skip_prefix(buffer, "committer ", &buffer))
 935                 return report(options, oid, OBJ_COMMIT, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
 936         err = fsck_ident(&buffer, oid, OBJ_COMMIT, options);
 937         if (err)
 938                 return err;
 939         if (memchr(buffer_begin, '\0', size)) {
 940                 err = report(options, oid, OBJ_COMMIT, FSCK_MSG_NUL_IN_COMMIT,
 941                              "NUL byte in the commit object body");
 942                 if (err)
 943                         return err;
 944         }
 945         return 0;
 946 }
 947
 948 static int fsck_tag(const struct object_id *oid, const char *buffer,
 949                     unsigned long size, struct fsck_options *options)
 950 {
 951         struct object_id tagged_oid;
 952         int tagged_type;
 953         return fsck_tag_standalone(oid, buffer, size, options, &tagged_oid,
 954                                    &tagged_type);
 955 }
 956
 957 int fsck_tag_standalone(const struct object_id *oid, const char *buffer,
 958                         unsigned long size, struct fsck_options *options,
 959                         struct object_id *tagged_oid,
 960                         int *tagged_type)
 961 {
 962         int ret = 0;
 963         char *eol;
 964         struct strbuf sb = STRBUF_INIT;
 965         const char *buffer_end = buffer + size;
 966         const char *p;
 967
 968         /*
 969          * We _must_ stop parsing immediately if this reports failure, as the
 970          * memory safety of the rest of the function depends on it. See the
 971          * comment above the definition of verify_headers() for more details.
 972          */
 973         ret = verify_headers(buffer, size, oid, OBJ_TAG, options);
 974         if (ret)
 975                 goto done;
 976
 977         if (buffer >= buffer_end || !skip_prefix(buffer, "object ", &buffer)) {
 978                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
 979                 goto done;
 980         }
 981         if (parse_oid_hex(buffer, tagged_oid, &p) || *p != '\n') {
 982                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
 983                 if (ret)
 984                         goto done;
 985         }
 986         buffer = p + 1;
 987
 988         if (buffer >= buffer_end || !skip_prefix(buffer, "type ", &buffer)) {
 989                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
 990                 goto done;
 991         }
 992         eol = memchr(buffer, '\n', buffer_end - buffer);
 993         if (!eol) {
 994                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
 995                 goto done;
 996         }
 997         *tagged_type = type_from_string_gently(buffer, eol - buffer, 1);
 998         if (*tagged_type < 0)
 999                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
1000         if (ret)
1001                 goto done;
1002         buffer = eol + 1;
1003
1004         if (buffer >= buffer_end || !skip_prefix(buffer, "tag ", &buffer)) {
1005                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
1006                 goto done;
1007         }
1008         eol = memchr(buffer, '\n', buffer_end - buffer);
1009         if (!eol) {
1010                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
1011                 goto done;
1012         }
1013         strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
1014         if (check_refname_format(sb.buf, 0)) {
1015                 ret = report(options, oid, OBJ_TAG,
1016                              FSCK_MSG_BAD_TAG_NAME,
1017                              "invalid 'tag' name: %.*s",
1018                              (int)(eol - buffer), buffer);
1019                 if (ret)
1020                         goto done;
1021         }
1022         buffer = eol + 1;
1023
1024         if (buffer >= buffer_end || !skip_prefix(buffer, "tagger ", &buffer)) {
1025                 /* early tags do not contain 'tagger' lines; warn only */
1026                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
1027                 if (ret)
1028                         goto done;
1029         }
1030         else
1031                 ret = fsck_ident(&buffer, oid, OBJ_TAG, options);
1032
1033         if (buffer < buffer_end && !starts_with(buffer, "\n")) {
1034                 /*
1035                  * The verify_headers() check will allow
1036                  * e.g. "[...]tagger <tagger>\nsome
1037                  * garbage\n\nmessage" to pass, thinking "some
1038                  * garbage" could be a custom header. E.g. "mktag"
1039                  * doesn't want any unknown headers.
1040                  */
1041                 ret = report(options, oid, OBJ_TAG, FSCK_MSG_EXTRA_HEADER_ENTRY, "invalid format - extra header(s) after 'tagger'");
1042                 if (ret)
1043                         goto done;
1044         }
1045
1046 done:
1047         strbuf_release(&sb);
1048         return ret;
1049 }
1050
1051 struct fsck_gitmodules_data {
1052         const struct object_id *oid;
1053         struct fsck_options *options;
1054         int ret;
1055 };
1056
1057 static int fsck_gitmodules_fn(const char *var, const char *value,
1058                               const struct config_context *ctx UNUSED,
1059                               void *vdata)
1060 {
1061         struct fsck_gitmodules_data *data = vdata;
1062         const char *subsection, *key;
1063         size_t subsection_len;
1064         char *name;
1065
1066         if (parse_config_key(var, "submodule", &subsection, &subsection_len, &key) < 0 ||
1067             !subsection)
1068                 return 0;
1069
1070         name = xmemdupz(subsection, subsection_len);
1071         if (check_submodule_name(name) < 0)
1072                 data->ret |= report(data->options,
1073                                     data->oid, OBJ_BLOB,
1074                                     FSCK_MSG_GITMODULES_NAME,
1075                                     "disallowed submodule name: %s",
1076                                     name);
1077         if (!strcmp(key, "url") && value &&
1078             check_submodule_url(value) < 0)
1079                 data->ret |= report(data->options,
1080                                     data->oid, OBJ_BLOB,
1081                                     FSCK_MSG_GITMODULES_URL,
1082                                     "disallowed submodule url: %s",
1083                                     value);
1084         if (!strcmp(key, "path") && value &&
1085             looks_like_command_line_option(value))
1086                 data->ret |= report(data->options,
1087                                     data->oid, OBJ_BLOB,
1088                                     FSCK_MSG_GITMODULES_PATH,
1089                                     "disallowed submodule path: %s",
1090                                     value);
1091         if (!strcmp(key, "update") && value &&
1092             parse_submodule_update_type(value) == SM_UPDATE_COMMAND)
1093                 data->ret |= report(data->options, data->oid, OBJ_BLOB,
1094                                     FSCK_MSG_GITMODULES_UPDATE,
1095                                     "disallowed submodule update setting: %s",
1096                                     value);
1097         free(name);
1098
1099         return 0;
1100 }
1101
1102 static int fsck_blob(const struct object_id *oid, const char *buf,
1103                      unsigned long size, struct fsck_options *options)
1104 {
1105         int ret = 0;
1106
1107         if (object_on_skiplist(options, oid))
1108                 return 0;
1109
1110         if (oidset_contains(&options->gitmodules_found, oid)) {
1111                 struct config_options config_opts = { 0 };
1112                 struct fsck_gitmodules_data data;
1113
1114                 oidset_insert(&options->gitmodules_done, oid);
1115
1116                 if (!buf) {
1117                         /*
1118                          * A missing buffer here is a sign that the caller found the
1119                          * blob too gigantic to load into memory. Let's just consider
1120                          * that an error.
1121                          */
1122                         return report(options, oid, OBJ_BLOB,
1123                                         FSCK_MSG_GITMODULES_LARGE,
1124                                         ".gitmodules too large to parse");
1125                 }
1126
1127                 data.oid = oid;
1128                 data.options = options;
1129                 data.ret = 0;
1130                 config_opts.error_action = CONFIG_ERROR_SILENT;
1131                 if (git_config_from_mem(fsck_gitmodules_fn, CONFIG_ORIGIN_BLOB,
1132                                         ".gitmodules", buf, size, &data,
1133                                         CONFIG_SCOPE_UNKNOWN, &config_opts))
1134                         data.ret |= report(options, oid, OBJ_BLOB,
1135                                         FSCK_MSG_GITMODULES_PARSE,
1136                                         "could not parse gitmodules blob");
1137                 ret |= data.ret;
1138         }
1139
1140         if (oidset_contains(&options->gitattributes_found, oid)) {
1141                 const char *ptr;
1142
1143                 oidset_insert(&options->gitattributes_done, oid);
1144
1145                 if (!buf || size > ATTR_MAX_FILE_SIZE) {
1146                         /*
1147                          * A missing buffer here is a sign that the caller found the
1148                          * blob too gigantic to load into memory. Let's just consider
1149                          * that an error.
1150                          */
1151                         return report(options, oid, OBJ_BLOB,
1152                                         FSCK_MSG_GITATTRIBUTES_LARGE,
1153                                         ".gitattributes too large to parse");
1154                 }
1155
1156                 for (ptr = buf; *ptr; ) {
1157                         const char *eol = strchrnul(ptr, '\n');
1158                         if (eol - ptr >= ATTR_MAX_LINE_LENGTH) {
1159                                 ret |= report(options, oid, OBJ_BLOB,
1160                                               FSCK_MSG_GITATTRIBUTES_LINE_LENGTH,
1161                                               ".gitattributes has too long lines to parse");
1162                                 break;
1163                         }
1164
1165                         ptr = *eol ? eol + 1 : eol;
1166                 }
1167         }
1168
1169         return ret;
1170 }
1171
1172 int fsck_object(struct object *obj, void *data, unsigned long size,
1173         struct fsck_options *options)
1174 {
1175         if (!obj)
1176                 return report(options, NULL, OBJ_NONE, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
1177
1178         return fsck_buffer(&obj->oid, obj->type, data, size, options);
1179 }
1180
1181 int fsck_buffer(const struct object_id *oid, enum object_type type,
1182                 void *data, unsigned long size,
1183                 struct fsck_options *options)
1184 {
1185         if (type == OBJ_BLOB)
1186                 return fsck_blob(oid, data, size, options);
1187         if (type == OBJ_TREE)
1188                 return fsck_tree(oid, data, size, options);
1189         if (type == OBJ_COMMIT)
1190                 return fsck_commit(oid, data, size, options);
1191         if (type == OBJ_TAG)
1192                 return fsck_tag(oid, data, size, options);
1193
1194         return report(options, oid, type,
1195                       FSCK_MSG_UNKNOWN_TYPE,
1196                       "unknown type '%d' (internal fsck error)",
1197                       type);
1198 }
1199
1200 int fsck_error_function(struct fsck_options *o,
1201                         const struct object_id *oid,
1202                         enum object_type object_type UNUSED,
1203                         enum fsck_msg_type msg_type,
1204                         enum fsck_msg_id msg_id UNUSED,
1205                         const char *message)
1206 {
1207         if (msg_type == FSCK_WARN) {
1208                 warning("object %s: %s", fsck_describe_object(o, oid), message);
1209                 return 0;
1210         }
1211         error("object %s: %s", fsck_describe_object(o, oid), message);
1212         return 1;
1213 }
1214
1215 static int fsck_blobs(struct oidset *blobs_found, struct oidset *blobs_done,
1216                       enum fsck_msg_id msg_missing, enum fsck_msg_id msg_type,
1217                       struct fsck_options *options, const char *blob_type)
1218 {
1219         int ret = 0;
1220         struct oidset_iter iter;
1221         const struct object_id *oid;
1222
1223         oidset_iter_init(blobs_found, &iter);
1224         while ((oid = oidset_iter_next(&iter))) {
1225                 enum object_type type;
1226                 unsigned long size;
1227                 char *buf;
1228
1229                 if (oidset_contains(blobs_done, oid))
1230                         continue;
1231
1232                 buf = repo_read_object_file(the_repository, oid, &type, &size);
1233                 if (!buf) {
1234                         if (is_promisor_object(oid))
1235                                 continue;
1236                         ret |= report(options,
1237                                       oid, OBJ_BLOB, msg_missing,
1238                                       "unable to read %s blob", blob_type);
1239                         continue;
1240                 }
1241
1242                 if (type == OBJ_BLOB)
1243                         ret |= fsck_blob(oid, buf, size, options);
1244                 else
1245                         ret |= report(options, oid, type, msg_type,
1246                                       "non-blob found at %s", blob_type);
1247                 free(buf);
1248         }
1249
1250         oidset_clear(blobs_found);
1251         oidset_clear(blobs_done);
1252
1253         return ret;
1254 }
1255
1256 int fsck_finish(struct fsck_options *options)
1257 {
1258         int ret = 0;
1259
1260         ret |= fsck_blobs(&options->gitmodules_found, &options->gitmodules_done,
1261                           FSCK_MSG_GITMODULES_MISSING, FSCK_MSG_GITMODULES_BLOB,
1262                           options, ".gitmodules");
1263         ret |= fsck_blobs(&options->gitattributes_found, &options->gitattributes_done,
1264                           FSCK_MSG_GITATTRIBUTES_MISSING, FSCK_MSG_GITATTRIBUTES_BLOB,
1265                           options, ".gitattributes");
1266
1267         return ret;
1268 }
1269
1270 int git_fsck_config(const char *var, const char *value,
1271                     const struct config_context *ctx, void *cb)
1272 {
1273         struct fsck_options *options = cb;
1274         const char *msg_id;
1275
1276         if (strcmp(var, "fsck.skiplist") == 0) {
1277                 const char *path;
1278                 struct strbuf sb = STRBUF_INIT;
1279
1280                 if (git_config_pathname(&path, var, value))
1281                         return 1;
1282                 strbuf_addf(&sb, "skiplist=%s", path);
1283                 free((char *)path);
1284                 fsck_set_msg_types(options, sb.buf);
1285                 strbuf_release(&sb);
1286                 return 0;
1287         }
1288
1289         if (skip_prefix(var, "fsck.", &msg_id)) {
1290                 if (!value)
1291                         return config_error_nonbool(var);
1292                 fsck_set_msg_type(options, msg_id, value);
1293                 return 0;
1294         }
1295
1296         return git_default_config(var, value, ctx, cb);
1297 }
1298
1299 /*
1300  * Custom error callbacks that are used in more than one place.
1301  */
1302
1303 int fsck_error_cb_print_missing_gitmodules(struct fsck_options *o,
1304                                            const struct object_id *oid,
1305                                            enum object_type object_type,
1306                                            enum fsck_msg_type msg_type,
1307                                            enum fsck_msg_id msg_id,
1308                                            const char *message)
1309 {
1310         if (msg_id == FSCK_MSG_GITMODULES_MISSING) {
1311                 puts(oid_to_hex(oid));
1312                 return 0;
1313         }
1314         return fsck_error_function(o, oid, object_type, msg_type, msg_id, message);
1315 }