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