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