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

   1 #include "cache.h"
   2 #include "object-store.h"
   3 #include "repository.h"
   4 #include "object.h"
   5 #include "blob.h"
   6 #include "tree.h"
   7 #include "tree-walk.h"
   8 #include "commit.h"
   9 #include "tag.h"
  10 #include "fsck.h"
  11 #include "refs.h"
  12 #include "utf8.h"
  13 #include "sha1-array.h"
  14 #include "decorate.h"
  15 #include "oidset.h"
  16 #include "packfile.h"
  17 #include "submodule-config.h"
  18 #include "config.h"
  19 #include "help.h"
  20
  21 static struct oidset gitmodules_found = OIDSET_INIT;
  22 static struct oidset gitmodules_done = OIDSET_INIT;
  23
  24 #define FSCK_FATAL -1
  25 #define FSCK_INFO -2
  26
  27 #define FOREACH_MSG_ID(FUNC) \
  28         /* fatal errors */ \
  29         FUNC(NUL_IN_HEADER, FATAL) \
  30         FUNC(UNTERMINATED_HEADER, FATAL) \
  31         /* errors */ \
  32         FUNC(BAD_DATE, ERROR) \
  33         FUNC(BAD_DATE_OVERFLOW, ERROR) \
  34         FUNC(BAD_EMAIL, ERROR) \
  35         FUNC(BAD_NAME, ERROR) \
  36         FUNC(BAD_OBJECT_SHA1, ERROR) \
  37         FUNC(BAD_PARENT_SHA1, ERROR) \
  38         FUNC(BAD_TAG_OBJECT, ERROR) \
  39         FUNC(BAD_TIMEZONE, ERROR) \
  40         FUNC(BAD_TREE, ERROR) \
  41         FUNC(BAD_TREE_SHA1, ERROR) \
  42         FUNC(BAD_TYPE, ERROR) \
  43         FUNC(DUPLICATE_ENTRIES, ERROR) \
  44         FUNC(MISSING_AUTHOR, ERROR) \
  45         FUNC(MISSING_COMMITTER, ERROR) \
  46         FUNC(MISSING_EMAIL, ERROR) \
  47         FUNC(MISSING_GRAFT, ERROR) \
  48         FUNC(MISSING_NAME_BEFORE_EMAIL, ERROR) \
  49         FUNC(MISSING_OBJECT, ERROR) \
  50         FUNC(MISSING_PARENT, ERROR) \
  51         FUNC(MISSING_SPACE_BEFORE_DATE, ERROR) \
  52         FUNC(MISSING_SPACE_BEFORE_EMAIL, ERROR) \
  53         FUNC(MISSING_TAG, ERROR) \
  54         FUNC(MISSING_TAG_ENTRY, ERROR) \
  55         FUNC(MISSING_TAG_OBJECT, ERROR) \
  56         FUNC(MISSING_TREE, ERROR) \
  57         FUNC(MISSING_TREE_OBJECT, ERROR) \
  58         FUNC(MISSING_TYPE, ERROR) \
  59         FUNC(MISSING_TYPE_ENTRY, ERROR) \
  60         FUNC(MULTIPLE_AUTHORS, ERROR) \
  61         FUNC(TAG_OBJECT_NOT_TAG, ERROR) \
  62         FUNC(TREE_NOT_SORTED, ERROR) \
  63         FUNC(UNKNOWN_TYPE, ERROR) \
  64         FUNC(ZERO_PADDED_DATE, ERROR) \
  65         FUNC(GITMODULES_MISSING, ERROR) \
  66         FUNC(GITMODULES_BLOB, ERROR) \
  67         FUNC(GITMODULES_LARGE, ERROR) \
  68         FUNC(GITMODULES_NAME, ERROR) \
  69         FUNC(GITMODULES_SYMLINK, ERROR) \
  70         /* warnings */ \
  71         FUNC(BAD_FILEMODE, WARN) \
  72         FUNC(EMPTY_NAME, WARN) \
  73         FUNC(FULL_PATHNAME, WARN) \
  74         FUNC(HAS_DOT, WARN) \
  75         FUNC(HAS_DOTDOT, WARN) \
  76         FUNC(HAS_DOTGIT, WARN) \
  77         FUNC(NULL_SHA1, WARN) \
  78         FUNC(ZERO_PADDED_FILEMODE, WARN) \
  79         FUNC(NUL_IN_COMMIT, WARN) \
  80         /* infos (reported as warnings, but ignored by default) */ \
  81         FUNC(GITMODULES_PARSE, INFO) \
  82         FUNC(BAD_TAG_NAME, INFO) \
  83         FUNC(MISSING_TAGGER_ENTRY, INFO)
  84
  85 #define MSG_ID(id, msg_type) FSCK_MSG_##id,
  86 enum fsck_msg_id {
  87         FOREACH_MSG_ID(MSG_ID)
  88         FSCK_MSG_MAX
  89 };
  90 #undef MSG_ID
  91
  92 #define STR(x) #x
  93 #define MSG_ID(id, msg_type) { STR(id), NULL, NULL, FSCK_##msg_type },
  94 static struct {
  95         const char *id_string;
  96         const char *downcased;
  97         const char *camelcased;
  98         int msg_type;
  99 } msg_id_info[FSCK_MSG_MAX + 1] = {
 100         FOREACH_MSG_ID(MSG_ID)
 101         { NULL, NULL, NULL, -1 }
 102 };
 103 #undef MSG_ID
 104
 105 static void prepare_msg_ids(void)
 106 {
 107         int i;
 108
 109         if (msg_id_info[0].downcased)
 110                 return;
 111
 112         /* convert id_string to lower case, without underscores. */
 113         for (i = 0; i < FSCK_MSG_MAX; i++) {
 114                 const char *p = msg_id_info[i].id_string;
 115                 int len = strlen(p);
 116                 char *q = xmalloc(len);
 117
 118                 msg_id_info[i].downcased = q;
 119                 while (*p)
 120                         if (*p == '_')
 121                                 p++;
 122                         else
 123                                 *(q)++ = tolower(*(p)++);
 124                 *q = '\0';
 125
 126                 p = msg_id_info[i].id_string;
 127                 q = xmalloc(len);
 128                 msg_id_info[i].camelcased = q;
 129                 while (*p) {
 130                         if (*p == '_') {
 131                                 p++;
 132                                 if (*p)
 133                                         *q++ = *p++;
 134                         } else {
 135                                 *q++ = tolower(*p++);
 136                         }
 137                 }
 138                 *q = '\0';
 139         }
 140 }
 141
 142 static int parse_msg_id(const char *text)
 143 {
 144         int i;
 145
 146         prepare_msg_ids();
 147
 148         for (i = 0; i < FSCK_MSG_MAX; i++)
 149                 if (!strcmp(text, msg_id_info[i].downcased))
 150                         return i;
 151
 152         return -1;
 153 }
 154
 155 void list_config_fsck_msg_ids(struct string_list *list, const char *prefix)
 156 {
 157         int i;
 158
 159         prepare_msg_ids();
 160
 161         for (i = 0; i < FSCK_MSG_MAX; i++)
 162                 list_config_item(list, prefix, msg_id_info[i].camelcased);
 163 }
 164
 165 static int fsck_msg_type(enum fsck_msg_id msg_id,
 166         struct fsck_options *options)
 167 {
 168         int msg_type;
 169
 170         assert(msg_id >= 0 && msg_id < FSCK_MSG_MAX);
 171
 172         if (options->msg_type)
 173                 msg_type = options->msg_type[msg_id];
 174         else {
 175                 msg_type = msg_id_info[msg_id].msg_type;
 176                 if (options->strict && msg_type == FSCK_WARN)
 177                         msg_type = FSCK_ERROR;
 178         }
 179
 180         return msg_type;
 181 }
 182
 183 static void init_skiplist(struct fsck_options *options, const char *path)
 184 {
 185         static struct oid_array skiplist = OID_ARRAY_INIT;
 186         int sorted, fd;
 187         char buffer[GIT_MAX_HEXSZ + 1];
 188         struct object_id oid;
 189
 190         if (options->skiplist)
 191                 sorted = options->skiplist->sorted;
 192         else {
 193                 sorted = 1;
 194                 options->skiplist = &skiplist;
 195         }
 196
 197         fd = open(path, O_RDONLY);
 198         if (fd < 0)
 199                 die("Could not open skip list: %s", path);
 200         for (;;) {
 201                 const char *p;
 202                 int result = read_in_full(fd, buffer, sizeof(buffer));
 203                 if (result < 0)
 204                         die_errno("Could not read '%s'", path);
 205                 if (!result)
 206                         break;
 207                 if (parse_oid_hex(buffer, &oid, &p) || *p != '\n')
 208                         die("Invalid SHA-1: %s", buffer);
 209                 oid_array_append(&skiplist, &oid);
 210                 if (sorted && skiplist.nr > 1 &&
 211                                 oidcmp(&skiplist.oid[skiplist.nr - 2],
 212                                        &oid) > 0)
 213                         sorted = 0;
 214         }
 215         close(fd);
 216
 217         if (sorted)
 218                 skiplist.sorted = 1;
 219 }
 220
 221 static int parse_msg_type(const char *str)
 222 {
 223         if (!strcmp(str, "error"))
 224                 return FSCK_ERROR;
 225         else if (!strcmp(str, "warn"))
 226                 return FSCK_WARN;
 227         else if (!strcmp(str, "ignore"))
 228                 return FSCK_IGNORE;
 229         else
 230                 die("Unknown fsck message type: '%s'", str);
 231 }
 232
 233 int is_valid_msg_type(const char *msg_id, const char *msg_type)
 234 {
 235         if (parse_msg_id(msg_id) < 0)
 236                 return 0;
 237         parse_msg_type(msg_type);
 238         return 1;
 239 }
 240
 241 void fsck_set_msg_type(struct fsck_options *options,
 242                 const char *msg_id, const char *msg_type)
 243 {
 244         int id = parse_msg_id(msg_id), type;
 245
 246         if (id < 0)
 247                 die("Unhandled message id: %s", msg_id);
 248         type = parse_msg_type(msg_type);
 249
 250         if (type != FSCK_ERROR && msg_id_info[id].msg_type == FSCK_FATAL)
 251                 die("Cannot demote %s to %s", msg_id, msg_type);
 252
 253         if (!options->msg_type) {
 254                 int i;
 255                 int *msg_type;
 256                 ALLOC_ARRAY(msg_type, FSCK_MSG_MAX);
 257                 for (i = 0; i < FSCK_MSG_MAX; i++)
 258                         msg_type[i] = fsck_msg_type(i, options);
 259                 options->msg_type = msg_type;
 260         }
 261
 262         options->msg_type[id] = type;
 263 }
 264
 265 void fsck_set_msg_types(struct fsck_options *options, const char *values)
 266 {
 267         char *buf = xstrdup(values), *to_free = buf;
 268         int done = 0;
 269
 270         while (!done) {
 271                 int len = strcspn(buf, " ,|"), equal;
 272
 273                 done = !buf[len];
 274                 if (!len) {
 275                         buf++;
 276                         continue;
 277                 }
 278                 buf[len] = '\0';
 279
 280                 for (equal = 0;
 281                      equal < len && buf[equal] != '=' && buf[equal] != ':';
 282                      equal++)
 283                         buf[equal] = tolower(buf[equal]);
 284                 buf[equal] = '\0';
 285
 286                 if (!strcmp(buf, "skiplist")) {
 287                         if (equal == len)
 288                                 die("skiplist requires a path");
 289                         init_skiplist(options, buf + equal + 1);
 290                         buf += len + 1;
 291                         continue;
 292                 }
 293
 294                 if (equal == len)
 295                         die("Missing '=': '%s'", buf);
 296
 297                 fsck_set_msg_type(options, buf, buf + equal + 1);
 298                 buf += len + 1;
 299         }
 300         free(to_free);
 301 }
 302
 303 static void append_msg_id(struct strbuf *sb, const char *msg_id)
 304 {
 305         for (;;) {
 306                 char c = *(msg_id)++;
 307
 308                 if (!c)
 309                         break;
 310                 if (c != '_')
 311                         strbuf_addch(sb, tolower(c));
 312                 else {
 313                         assert(*msg_id);
 314                         strbuf_addch(sb, *(msg_id)++);
 315                 }
 316         }
 317
 318         strbuf_addstr(sb, ": ");
 319 }
 320
 321 static int object_on_skiplist(struct fsck_options *opts, struct object *obj)
 322 {
 323         if (opts && opts->skiplist && obj)
 324                 return oid_array_lookup(opts->skiplist, &obj->oid) >= 0;
 325         return 0;
 326 }
 327
 328 __attribute__((format (printf, 4, 5)))
 329 static int report(struct fsck_options *options, struct object *object,
 330         enum fsck_msg_id id, const char *fmt, ...)
 331 {
 332         va_list ap;
 333         struct strbuf sb = STRBUF_INIT;
 334         int msg_type = fsck_msg_type(id, options), result;
 335
 336         if (msg_type == FSCK_IGNORE)
 337                 return 0;
 338
 339         if (object_on_skiplist(options, object))
 340                 return 0;
 341
 342         if (msg_type == FSCK_FATAL)
 343                 msg_type = FSCK_ERROR;
 344         else if (msg_type == FSCK_INFO)
 345                 msg_type = FSCK_WARN;
 346
 347         append_msg_id(&sb, msg_id_info[id].id_string);
 348
 349         va_start(ap, fmt);
 350         strbuf_vaddf(&sb, fmt, ap);
 351         result = options->error_func(options, object, msg_type, sb.buf);
 352         strbuf_release(&sb);
 353         va_end(ap);
 354
 355         return result;
 356 }
 357
 358 static char *get_object_name(struct fsck_options *options, struct object *obj)
 359 {
 360         if (!options->object_names)
 361                 return NULL;
 362         return lookup_decoration(options->object_names, obj);
 363 }
 364
 365 static void put_object_name(struct fsck_options *options, struct object *obj,
 366         const char *fmt, ...)
 367 {
 368         va_list ap;
 369         struct strbuf buf = STRBUF_INIT;
 370         char *existing;
 371
 372         if (!options->object_names)
 373                 return;
 374         existing = lookup_decoration(options->object_names, obj);
 375         if (existing)
 376                 return;
 377         va_start(ap, fmt);
 378         strbuf_vaddf(&buf, fmt, ap);
 379         add_decoration(options->object_names, obj, strbuf_detach(&buf, NULL));
 380         va_end(ap);
 381 }
 382
 383 static const char *describe_object(struct fsck_options *o, struct object *obj)
 384 {
 385         static struct strbuf buf = STRBUF_INIT;
 386         char *name;
 387
 388         strbuf_reset(&buf);
 389         strbuf_addstr(&buf, oid_to_hex(&obj->oid));
 390         if (o->object_names && (name = lookup_decoration(o->object_names, obj)))
 391                 strbuf_addf(&buf, " (%s)", name);
 392
 393         return buf.buf;
 394 }
 395
 396 static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
 397 {
 398         struct tree_desc desc;
 399         struct name_entry entry;
 400         int res = 0;
 401         const char *name;
 402
 403         if (parse_tree(tree))
 404                 return -1;
 405
 406         name = get_object_name(options, &tree->object);
 407         if (init_tree_desc_gently(&desc, tree->buffer, tree->size))
 408                 return -1;
 409         while (tree_entry_gently(&desc, &entry)) {
 410                 struct object *obj;
 411                 int result;
 412
 413                 if (S_ISGITLINK(entry.mode))
 414                         continue;
 415
 416                 if (S_ISDIR(entry.mode)) {
 417                         obj = (struct object *)lookup_tree(the_repository, entry.oid);
 418                         if (name && obj)
 419                                 put_object_name(options, obj, "%s%s/", name,
 420                                         entry.path);
 421                         result = options->walk(obj, OBJ_TREE, data, options);
 422                 }
 423                 else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
 424                         obj = (struct object *)lookup_blob(the_repository, entry.oid);
 425                         if (name && obj)
 426                                 put_object_name(options, obj, "%s%s", name,
 427                                         entry.path);
 428                         result = options->walk(obj, OBJ_BLOB, data, options);
 429                 }
 430                 else {
 431                         result = error("in tree %s: entry %s has bad mode %.6o",
 432                                         describe_object(options, &tree->object), entry.path, entry.mode);
 433                 }
 434                 if (result < 0)
 435                         return result;
 436                 if (!res)
 437                         res = result;
 438         }
 439         return res;
 440 }
 441
 442 static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
 443 {
 444         int counter = 0, generation = 0, name_prefix_len = 0;
 445         struct commit_list *parents;
 446         int res;
 447         int result;
 448         const char *name;
 449
 450         if (parse_commit(commit))
 451                 return -1;
 452
 453         name = get_object_name(options, &commit->object);
 454         if (name)
 455                 put_object_name(options, &get_commit_tree(commit)->object,
 456                                 "%s:", name);
 457
 458         result = options->walk((struct object *)get_commit_tree(commit),
 459                                OBJ_TREE, data, options);
 460         if (result < 0)
 461                 return result;
 462         res = result;
 463
 464         parents = commit->parents;
 465         if (name && parents) {
 466                 int len = strlen(name), power;
 467
 468                 if (len && name[len - 1] == '^') {
 469                         generation = 1;
 470                         name_prefix_len = len - 1;
 471                 }
 472                 else { /* parse ~<generation> suffix */
 473                         for (generation = 0, power = 1;
 474                              len && isdigit(name[len - 1]);
 475                              power *= 10)
 476                                 generation += power * (name[--len] - '0');
 477                         if (power > 1 && len && name[len - 1] == '~')
 478                                 name_prefix_len = len - 1;
 479                 }
 480         }
 481
 482         while (parents) {
 483                 if (name) {
 484                         struct object *obj = &parents->item->object;
 485
 486                         if (++counter > 1)
 487                                 put_object_name(options, obj, "%s^%d",
 488                                         name, counter);
 489                         else if (generation > 0)
 490                                 put_object_name(options, obj, "%.*s~%d",
 491                                         name_prefix_len, name, generation + 1);
 492                         else
 493                                 put_object_name(options, obj, "%s^", name);
 494                 }
 495                 result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
 496                 if (result < 0)
 497                         return result;
 498                 if (!res)
 499                         res = result;
 500                 parents = parents->next;
 501         }
 502         return res;
 503 }
 504
 505 static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
 506 {
 507         char *name = get_object_name(options, &tag->object);
 508
 509         if (parse_tag(tag))
 510                 return -1;
 511         if (name)
 512                 put_object_name(options, tag->tagged, "%s", name);
 513         return options->walk(tag->tagged, OBJ_ANY, data, options);
 514 }
 515
 516 int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
 517 {
 518         if (!obj)
 519                 return -1;
 520
 521         if (obj->type == OBJ_NONE)
 522                 parse_object(the_repository, &obj->oid);
 523
 524         switch (obj->type) {
 525         case OBJ_BLOB:
 526                 return 0;
 527         case OBJ_TREE:
 528                 return fsck_walk_tree((struct tree *)obj, data, options);
 529         case OBJ_COMMIT:
 530                 return fsck_walk_commit((struct commit *)obj, data, options);
 531         case OBJ_TAG:
 532                 return fsck_walk_tag((struct tag *)obj, data, options);
 533         default:
 534                 error("Unknown object type for %s", describe_object(options, obj));
 535                 return -1;
 536         }
 537 }
 538
 539 /*
 540  * The entries in a tree are ordered in the _path_ order,
 541  * which means that a directory entry is ordered by adding
 542  * a slash to the end of it.
 543  *
 544  * So a directory called "a" is ordered _after_ a file
 545  * called "a.c", because "a/" sorts after "a.c".
 546  */
 547 #define TREE_UNORDERED (-1)
 548 #define TREE_HAS_DUPS  (-2)
 549
 550 static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
 551 {
 552         int len1 = strlen(name1);
 553         int len2 = strlen(name2);
 554         int len = len1 < len2 ? len1 : len2;
 555         unsigned char c1, c2;
 556         int cmp;
 557
 558         cmp = memcmp(name1, name2, len);
 559         if (cmp < 0)
 560                 return 0;
 561         if (cmp > 0)
 562                 return TREE_UNORDERED;
 563
 564         /*
 565          * Ok, the first <len> characters are the same.
 566          * Now we need to order the next one, but turn
 567          * a '\0' into a '/' for a directory entry.
 568          */
 569         c1 = name1[len];
 570         c2 = name2[len];
 571         if (!c1 && !c2)
 572                 /*
 573                  * git-write-tree used to write out a nonsense tree that has
 574                  * entries with the same name, one blob and one tree.  Make
 575                  * sure we do not have duplicate entries.
 576                  */
 577                 return TREE_HAS_DUPS;
 578         if (!c1 && S_ISDIR(mode1))
 579                 c1 = '/';
 580         if (!c2 && S_ISDIR(mode2))
 581                 c2 = '/';
 582         return c1 < c2 ? 0 : TREE_UNORDERED;
 583 }
 584
 585 static int fsck_tree(struct tree *item, struct fsck_options *options)
 586 {
 587         int retval = 0;
 588         int has_null_sha1 = 0;
 589         int has_full_path = 0;
 590         int has_empty_name = 0;
 591         int has_dot = 0;
 592         int has_dotdot = 0;
 593         int has_dotgit = 0;
 594         int has_zero_pad = 0;
 595         int has_bad_modes = 0;
 596         int has_dup_entries = 0;
 597         int not_properly_sorted = 0;
 598         struct tree_desc desc;
 599         unsigned o_mode;
 600         const char *o_name;
 601
 602         if (init_tree_desc_gently(&desc, item->buffer, item->size)) {
 603                 retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 604                 return retval;
 605         }
 606
 607         o_mode = 0;
 608         o_name = NULL;
 609
 610         while (desc.size) {
 611                 unsigned mode;
 612                 const char *name;
 613                 const struct object_id *oid;
 614
 615                 oid = tree_entry_extract(&desc, &name, &mode);
 616
 617                 has_null_sha1 |= is_null_oid(oid);
 618                 has_full_path |= !!strchr(name, '/');
 619                 has_empty_name |= !*name;
 620                 has_dot |= !strcmp(name, ".");
 621                 has_dotdot |= !strcmp(name, "..");
 622                 has_dotgit |= is_hfs_dotgit(name) || is_ntfs_dotgit(name);
 623                 has_zero_pad |= *(char *)desc.buffer == '0';
 624
 625                 if (is_hfs_dotgitmodules(name) || is_ntfs_dotgitmodules(name)) {
 626                         if (!S_ISLNK(mode))
 627                                 oidset_insert(&gitmodules_found, oid);
 628                         else
 629                                 retval += report(options, &item->object,
 630                                                  FSCK_MSG_GITMODULES_SYMLINK,
 631                                                  ".gitmodules is a symbolic link");
 632                 }
 633
 634                 if (update_tree_entry_gently(&desc)) {
 635                         retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 636                         break;
 637                 }
 638
 639                 switch (mode) {
 640                 /*
 641                  * Standard modes..
 642                  */
 643                 case S_IFREG | 0755:
 644                 case S_IFREG | 0644:
 645                 case S_IFLNK:
 646                 case S_IFDIR:
 647                 case S_IFGITLINK:
 648                         break;
 649                 /*
 650                  * This is nonstandard, but we had a few of these
 651                  * early on when we honored the full set of mode
 652                  * bits..
 653                  */
 654                 case S_IFREG | 0664:
 655                         if (!options->strict)
 656                                 break;
 657                         /* fallthrough */
 658                 default:
 659                         has_bad_modes = 1;
 660                 }
 661
 662                 if (o_name) {
 663                         switch (verify_ordered(o_mode, o_name, mode, name)) {
 664                         case TREE_UNORDERED:
 665                                 not_properly_sorted = 1;
 666                                 break;
 667                         case TREE_HAS_DUPS:
 668                                 has_dup_entries = 1;
 669                                 break;
 670                         default:
 671                                 break;
 672                         }
 673                 }
 674
 675                 o_mode = mode;
 676                 o_name = name;
 677         }
 678
 679         if (has_null_sha1)
 680                 retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
 681         if (has_full_path)
 682                 retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
 683         if (has_empty_name)
 684                 retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
 685         if (has_dot)
 686                 retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
 687         if (has_dotdot)
 688                 retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
 689         if (has_dotgit)
 690                 retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
 691         if (has_zero_pad)
 692                 retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
 693         if (has_bad_modes)
 694                 retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
 695         if (has_dup_entries)
 696                 retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
 697         if (not_properly_sorted)
 698                 retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
 699         return retval;
 700 }
 701
 702 static int verify_headers(const void *data, unsigned long size,
 703                           struct object *obj, struct fsck_options *options)
 704 {
 705         const char *buffer = (const char *)data;
 706         unsigned long i;
 707
 708         for (i = 0; i < size; i++) {
 709                 switch (buffer[i]) {
 710                 case '\0':
 711                         return report(options, obj,
 712                                 FSCK_MSG_NUL_IN_HEADER,
 713                                 "unterminated header: NUL at offset %ld", i);
 714                 case '\n':
 715                         if (i + 1 < size && buffer[i + 1] == '\n')
 716                                 return 0;
 717                 }
 718         }
 719
 720         /*
 721          * We did not find double-LF that separates the header
 722          * and the body.  Not having a body is not a crime but
 723          * we do want to see the terminating LF for the last header
 724          * line.
 725          */
 726         if (size && buffer[size - 1] == '\n')
 727                 return 0;
 728
 729         return report(options, obj,
 730                 FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
 731 }
 732
 733 static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
 734 {
 735         const char *p = *ident;
 736         char *end;
 737
 738         *ident = strchrnul(*ident, '\n');
 739         if (**ident == '\n')
 740                 (*ident)++;
 741
 742         if (*p == '<')
 743                 return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 744         p += strcspn(p, "<>\n");
 745         if (*p == '>')
 746                 return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
 747         if (*p != '<')
 748                 return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
 749         if (p[-1] != ' ')
 750                 return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 751         p++;
 752         p += strcspn(p, "<>\n");
 753         if (*p != '>')
 754                 return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
 755         p++;
 756         if (*p != ' ')
 757                 return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
 758         p++;
 759         if (*p == '0' && p[1] != ' ')
 760                 return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
 761         if (date_overflows(parse_timestamp(p, &end, 10)))
 762                 return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
 763         if ((end == p || *end != ' '))
 764                 return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
 765         p = end + 1;
 766         if ((*p != '+' && *p != '-') ||
 767             !isdigit(p[1]) ||
 768             !isdigit(p[2]) ||
 769             !isdigit(p[3]) ||
 770             !isdigit(p[4]) ||
 771             (p[5] != '\n'))
 772                 return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
 773         p += 6;
 774         return 0;
 775 }
 776
 777 static int fsck_commit_buffer(struct commit *commit, const char *buffer,
 778         unsigned long size, struct fsck_options *options)
 779 {
 780         struct object_id tree_oid, oid;
 781         struct commit_graft *graft;
 782         unsigned parent_count, parent_line_count = 0, author_count;
 783         int err;
 784         const char *buffer_begin = buffer;
 785         const char *p;
 786
 787         if (verify_headers(buffer, size, &commit->object, options))
 788                 return -1;
 789
 790         if (!skip_prefix(buffer, "tree ", &buffer))
 791                 return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
 792         if (parse_oid_hex(buffer, &tree_oid, &p) || *p != '\n') {
 793                 err = report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
 794                 if (err)
 795                         return err;
 796         }
 797         buffer = p + 1;
 798         while (skip_prefix(buffer, "parent ", &buffer)) {
 799                 if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
 800                         err = report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
 801                         if (err)
 802                                 return err;
 803                 }
 804                 buffer = p + 1;
 805                 parent_line_count++;
 806         }
 807         graft = lookup_commit_graft(the_repository, &commit->object.oid);
 808         parent_count = commit_list_count(commit->parents);
 809         if (graft) {
 810                 if (graft->nr_parent == -1 && !parent_count)
 811                         ; /* shallow commit */
 812                 else if (graft->nr_parent != parent_count) {
 813                         err = report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
 814                         if (err)
 815                                 return err;
 816                 }
 817         } else {
 818                 if (parent_count != parent_line_count) {
 819                         err = report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
 820                         if (err)
 821                                 return err;
 822                 }
 823         }
 824         author_count = 0;
 825         while (skip_prefix(buffer, "author ", &buffer)) {
 826                 author_count++;
 827                 err = fsck_ident(&buffer, &commit->object, options);
 828                 if (err)
 829                         return err;
 830         }
 831         if (author_count < 1)
 832                 err = report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
 833         else if (author_count > 1)
 834                 err = report(options, &commit->object, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
 835         if (err)
 836                 return err;
 837         if (!skip_prefix(buffer, "committer ", &buffer))
 838                 return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
 839         err = fsck_ident(&buffer, &commit->object, options);
 840         if (err)
 841                 return err;
 842         if (!get_commit_tree(commit)) {
 843                 err = report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", oid_to_hex(&tree_oid));
 844                 if (err)
 845                         return err;
 846         }
 847         if (memchr(buffer_begin, '\0', size)) {
 848                 err = report(options, &commit->object, FSCK_MSG_NUL_IN_COMMIT,
 849                              "NUL byte in the commit object body");
 850                 if (err)
 851                         return err;
 852         }
 853         return 0;
 854 }
 855
 856 static int fsck_commit(struct commit *commit, const char *data,
 857         unsigned long size, struct fsck_options *options)
 858 {
 859         const char *buffer = data ?  data : get_commit_buffer(commit, &size);
 860         int ret = fsck_commit_buffer(commit, buffer, size, options);
 861         if (!data)
 862                 unuse_commit_buffer(commit, buffer);
 863         return ret;
 864 }
 865
 866 static int fsck_tag_buffer(struct tag *tag, const char *data,
 867         unsigned long size, struct fsck_options *options)
 868 {
 869         struct object_id oid;
 870         int ret = 0;
 871         const char *buffer;
 872         char *to_free = NULL, *eol;
 873         struct strbuf sb = STRBUF_INIT;
 874         const char *p;
 875
 876         if (data)
 877                 buffer = data;
 878         else {
 879                 enum object_type type;
 880
 881                 buffer = to_free =
 882                         read_object_file(&tag->object.oid, &type, &size);
 883                 if (!buffer)
 884                         return report(options, &tag->object,
 885                                 FSCK_MSG_MISSING_TAG_OBJECT,
 886                                 "cannot read tag object");
 887
 888                 if (type != OBJ_TAG) {
 889                         ret = report(options, &tag->object,
 890                                 FSCK_MSG_TAG_OBJECT_NOT_TAG,
 891                                 "expected tag got %s",
 892                             type_name(type));
 893                         goto done;
 894                 }
 895         }
 896
 897         ret = verify_headers(buffer, size, &tag->object, options);
 898         if (ret)
 899                 goto done;
 900
 901         if (!skip_prefix(buffer, "object ", &buffer)) {
 902                 ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
 903                 goto done;
 904         }
 905         if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
 906                 ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
 907                 if (ret)
 908                         goto done;
 909         }
 910         buffer = p + 1;
 911
 912         if (!skip_prefix(buffer, "type ", &buffer)) {
 913                 ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
 914                 goto done;
 915         }
 916         eol = strchr(buffer, '\n');
 917         if (!eol) {
 918                 ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
 919                 goto done;
 920         }
 921         if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
 922                 ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
 923         if (ret)
 924                 goto done;
 925         buffer = eol + 1;
 926
 927         if (!skip_prefix(buffer, "tag ", &buffer)) {
 928                 ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
 929                 goto done;
 930         }
 931         eol = strchr(buffer, '\n');
 932         if (!eol) {
 933                 ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
 934                 goto done;
 935         }
 936         strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
 937         if (check_refname_format(sb.buf, 0)) {
 938                 ret = report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
 939                            "invalid 'tag' name: %.*s",
 940                            (int)(eol - buffer), buffer);
 941                 if (ret)
 942                         goto done;
 943         }
 944         buffer = eol + 1;
 945
 946         if (!skip_prefix(buffer, "tagger ", &buffer)) {
 947                 /* early tags do not contain 'tagger' lines; warn only */
 948                 ret = report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
 949                 if (ret)
 950                         goto done;
 951         }
 952         else
 953                 ret = fsck_ident(&buffer, &tag->object, options);
 954
 955 done:
 956         strbuf_release(&sb);
 957         free(to_free);
 958         return ret;
 959 }
 960
 961 static int fsck_tag(struct tag *tag, const char *data,
 962         unsigned long size, struct fsck_options *options)
 963 {
 964         struct object *tagged = tag->tagged;
 965
 966         if (!tagged)
 967                 return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
 968
 969         return fsck_tag_buffer(tag, data, size, options);
 970 }
 971
 972 struct fsck_gitmodules_data {
 973         struct object *obj;
 974         struct fsck_options *options;
 975         int ret;
 976 };
 977
 978 static int fsck_gitmodules_fn(const char *var, const char *value, void *vdata)
 979 {
 980         struct fsck_gitmodules_data *data = vdata;
 981         const char *subsection, *key;
 982         int subsection_len;
 983         char *name;
 984
 985         if (parse_config_key(var, "submodule", &subsection, &subsection_len, &key) < 0 ||
 986             !subsection)
 987                 return 0;
 988
 989         name = xmemdupz(subsection, subsection_len);
 990         if (check_submodule_name(name) < 0)
 991                 data->ret |= report(data->options, data->obj,
 992                                     FSCK_MSG_GITMODULES_NAME,
 993                                     "disallowed submodule name: %s",
 994                                     name);
 995         free(name);
 996
 997         return 0;
 998 }
 999
1000 static int fsck_blob(struct blob *blob, const char *buf,
1001                      unsigned long size, struct fsck_options *options)
1002 {
1003         struct fsck_gitmodules_data data;
1004         struct config_options config_opts = { 0 };
1005
1006         if (!oidset_contains(&gitmodules_found, &blob->object.oid))
1007                 return 0;
1008         oidset_insert(&gitmodules_done, &blob->object.oid);
1009
1010         if (object_on_skiplist(options, &blob->object))
1011                 return 0;
1012
1013         if (!buf) {
1014                 /*
1015                  * A missing buffer here is a sign that the caller found the
1016                  * blob too gigantic to load into memory. Let's just consider
1017                  * that an error.
1018                  */
1019                 return report(options, &blob->object,
1020                               FSCK_MSG_GITMODULES_LARGE,
1021                               ".gitmodules too large to parse");
1022         }
1023
1024         data.obj = &blob->object;
1025         data.options = options;
1026         data.ret = 0;
1027         config_opts.error_action = CONFIG_ERROR_SILENT;
1028         if (git_config_from_mem(fsck_gitmodules_fn, CONFIG_ORIGIN_BLOB,
1029                                 ".gitmodules", buf, size, &data, &config_opts))
1030                 data.ret |= report(options, &blob->object,
1031                                    FSCK_MSG_GITMODULES_PARSE,
1032                                    "could not parse gitmodules blob");
1033
1034         return data.ret;
1035 }
1036
1037 int fsck_object(struct object *obj, void *data, unsigned long size,
1038         struct fsck_options *options)
1039 {
1040         if (!obj)
1041                 return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
1042
1043         if (obj->type == OBJ_BLOB)
1044                 return fsck_blob((struct blob *)obj, data, size, options);
1045         if (obj->type == OBJ_TREE)
1046                 return fsck_tree((struct tree *) obj, options);
1047         if (obj->type == OBJ_COMMIT)
1048                 return fsck_commit((struct commit *) obj, (const char *) data,
1049                         size, options);
1050         if (obj->type == OBJ_TAG)
1051                 return fsck_tag((struct tag *) obj, (const char *) data,
1052                         size, options);
1053
1054         return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
1055                           obj->type);
1056 }
1057
1058 int fsck_error_function(struct fsck_options *o,
1059         struct object *obj, int msg_type, const char *message)
1060 {
1061         if (msg_type == FSCK_WARN) {
1062                 warning("object %s: %s", describe_object(o, obj), message);
1063                 return 0;
1064         }
1065         error("object %s: %s", describe_object(o, obj), message);
1066         return 1;
1067 }
1068
1069 int fsck_finish(struct fsck_options *options)
1070 {
1071         int ret = 0;
1072         struct oidset_iter iter;
1073         const struct object_id *oid;
1074
1075         oidset_iter_init(&gitmodules_found, &iter);
1076         while ((oid = oidset_iter_next(&iter))) {
1077                 struct blob *blob;
1078                 enum object_type type;
1079                 unsigned long size;
1080                 char *buf;
1081
1082                 if (oidset_contains(&gitmodules_done, oid))
1083                         continue;
1084
1085                 blob = lookup_blob(the_repository, oid);
1086                 if (!blob) {
1087                         struct object *obj = lookup_unknown_object(oid->hash);
1088                         ret |= report(options, obj,
1089                                       FSCK_MSG_GITMODULES_BLOB,
1090                                       "non-blob found at .gitmodules");
1091                         continue;
1092                 }
1093
1094                 buf = read_object_file(oid, &type, &size);
1095                 if (!buf) {
1096                         if (is_promisor_object(&blob->object.oid))
1097                                 continue;
1098                         ret |= report(options, &blob->object,
1099                                       FSCK_MSG_GITMODULES_MISSING,
1100                                       "unable to read .gitmodules blob");
1101                         continue;
1102                 }
1103
1104                 if (type == OBJ_BLOB)
1105                         ret |= fsck_blob(blob, buf, size, options);
1106                 else
1107                         ret |= report(options, &blob->object,
1108                                       FSCK_MSG_GITMODULES_BLOB,
1109                                       "non-blob found at .gitmodules");
1110                 free(buf);
1111         }
1112
1113
1114         oidset_clear(&gitmodules_found);
1115         oidset_clear(&gitmodules_done);
1116         return ret;
1117 }