Andrew's git / gitweb.git / fsck.c
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fsck.con commit object: add repository argument to object_as_type (1268dfa)
   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
  21static struct oidset gitmodules_found = OIDSET_INIT;
  22static 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_PARSE, 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(BAD_TAG_NAME, INFO) \
  82        FUNC(MISSING_TAGGER_ENTRY, INFO)
  83
  84#define MSG_ID(id, msg_type) FSCK_MSG_##id,
  85enum fsck_msg_id {
  86        FOREACH_MSG_ID(MSG_ID)
  87        FSCK_MSG_MAX
  88};
  89#undef MSG_ID
  90
  91#define STR(x) #x
  92#define MSG_ID(id, msg_type) { STR(id), NULL, NULL, FSCK_##msg_type },
  93static struct {
  94        const char *id_string;
  95        const char *downcased;
  96        const char *camelcased;
  97        int msg_type;
  98} msg_id_info[FSCK_MSG_MAX + 1] = {
  99        FOREACH_MSG_ID(MSG_ID)
 100        { NULL, NULL, NULL, -1 }
 101};
 102#undef MSG_ID
 103
 104static void prepare_msg_ids(void)
 105{
 106        int i;
 107
 108        if (msg_id_info[0].downcased)
 109                return;
 110
 111        /* convert id_string to lower case, without underscores. */
 112        for (i = 0; i < FSCK_MSG_MAX; i++) {
 113                const char *p = msg_id_info[i].id_string;
 114                int len = strlen(p);
 115                char *q = xmalloc(len);
 116
 117                msg_id_info[i].downcased = q;
 118                while (*p)
 119                        if (*p == '_')
 120                                p++;
 121                        else
 122                                *(q)++ = tolower(*(p)++);
 123                *q = '\0';
 124
 125                p = msg_id_info[i].id_string;
 126                q = xmalloc(len);
 127                msg_id_info[i].camelcased = q;
 128                while (*p) {
 129                        if (*p == '_') {
 130                                p++;
 131                                if (*p)
 132                                        *q++ = *p++;
 133                        } else {
 134                                *q++ = tolower(*p++);
 135                        }
 136                }
 137                *q = '\0';
 138        }
 139}
 140
 141static int parse_msg_id(const char *text)
 142{
 143        int i;
 144
 145        prepare_msg_ids();
 146
 147        for (i = 0; i < FSCK_MSG_MAX; i++)
 148                if (!strcmp(text, msg_id_info[i].downcased))
 149                        return i;
 150
 151        return -1;
 152}
 153
 154void list_config_fsck_msg_ids(struct string_list *list, const char *prefix)
 155{
 156        int i;
 157
 158        prepare_msg_ids();
 159
 160        for (i = 0; i < FSCK_MSG_MAX; i++)
 161                list_config_item(list, prefix, msg_id_info[i].camelcased);
 162}
 163
 164static int fsck_msg_type(enum fsck_msg_id msg_id,
 165        struct fsck_options *options)
 166{
 167        int msg_type;
 168
 169        assert(msg_id >= 0 && msg_id < FSCK_MSG_MAX);
 170
 171        if (options->msg_type)
 172                msg_type = options->msg_type[msg_id];
 173        else {
 174                msg_type = msg_id_info[msg_id].msg_type;
 175                if (options->strict && msg_type == FSCK_WARN)
 176                        msg_type = FSCK_ERROR;
 177        }
 178
 179        return msg_type;
 180}
 181
 182static void init_skiplist(struct fsck_options *options, const char *path)
 183{
 184        static struct oid_array skiplist = OID_ARRAY_INIT;
 185        int sorted, fd;
 186        char buffer[GIT_MAX_HEXSZ + 1];
 187        struct object_id oid;
 188
 189        if (options->skiplist)
 190                sorted = options->skiplist->sorted;
 191        else {
 192                sorted = 1;
 193                options->skiplist = &skiplist;
 194        }
 195
 196        fd = open(path, O_RDONLY);
 197        if (fd < 0)
 198                die("Could not open skip list: %s", path);
 199        for (;;) {
 200                const char *p;
 201                int result = read_in_full(fd, buffer, sizeof(buffer));
 202                if (result < 0)
 203                        die_errno("Could not read '%s'", path);
 204                if (!result)
 205                        break;
 206                if (parse_oid_hex(buffer, &oid, &p) || *p != '\n')
 207                        die("Invalid SHA-1: %s", buffer);
 208                oid_array_append(&skiplist, &oid);
 209                if (sorted && skiplist.nr > 1 &&
 210                                oidcmp(&skiplist.oid[skiplist.nr - 2],
 211                                       &oid) > 0)
 212                        sorted = 0;
 213        }
 214        close(fd);
 215
 216        if (sorted)
 217                skiplist.sorted = 1;
 218}
 219
 220static int parse_msg_type(const char *str)
 221{
 222        if (!strcmp(str, "error"))
 223                return FSCK_ERROR;
 224        else if (!strcmp(str, "warn"))
 225                return FSCK_WARN;
 226        else if (!strcmp(str, "ignore"))
 227                return FSCK_IGNORE;
 228        else
 229                die("Unknown fsck message type: '%s'", str);
 230}
 231
 232int is_valid_msg_type(const char *msg_id, const char *msg_type)
 233{
 234        if (parse_msg_id(msg_id) < 0)
 235                return 0;
 236        parse_msg_type(msg_type);
 237        return 1;
 238}
 239
 240void fsck_set_msg_type(struct fsck_options *options,
 241                const char *msg_id, const char *msg_type)
 242{
 243        int id = parse_msg_id(msg_id), type;
 244
 245        if (id < 0)
 246                die("Unhandled message id: %s", msg_id);
 247        type = parse_msg_type(msg_type);
 248
 249        if (type != FSCK_ERROR && msg_id_info[id].msg_type == FSCK_FATAL)
 250                die("Cannot demote %s to %s", msg_id, msg_type);
 251
 252        if (!options->msg_type) {
 253                int i;
 254                int *msg_type;
 255                ALLOC_ARRAY(msg_type, FSCK_MSG_MAX);
 256                for (i = 0; i < FSCK_MSG_MAX; i++)
 257                        msg_type[i] = fsck_msg_type(i, options);
 258                options->msg_type = msg_type;
 259        }
 260
 261        options->msg_type[id] = type;
 262}
 263
 264void fsck_set_msg_types(struct fsck_options *options, const char *values)
 265{
 266        char *buf = xstrdup(values), *to_free = buf;
 267        int done = 0;
 268
 269        while (!done) {
 270                int len = strcspn(buf, " ,|"), equal;
 271
 272                done = !buf[len];
 273                if (!len) {
 274                        buf++;
 275                        continue;
 276                }
 277                buf[len] = '\0';
 278
 279                for (equal = 0;
 280                     equal < len && buf[equal] != '=' && buf[equal] != ':';
 281                     equal++)
 282                        buf[equal] = tolower(buf[equal]);
 283                buf[equal] = '\0';
 284
 285                if (!strcmp(buf, "skiplist")) {
 286                        if (equal == len)
 287                                die("skiplist requires a path");
 288                        init_skiplist(options, buf + equal + 1);
 289                        buf += len + 1;
 290                        continue;
 291                }
 292
 293                if (equal == len)
 294                        die("Missing '=': '%s'", buf);
 295
 296                fsck_set_msg_type(options, buf, buf + equal + 1);
 297                buf += len + 1;
 298        }
 299        free(to_free);
 300}
 301
 302static void append_msg_id(struct strbuf *sb, const char *msg_id)
 303{
 304        for (;;) {
 305                char c = *(msg_id)++;
 306
 307                if (!c)
 308                        break;
 309                if (c != '_')
 310                        strbuf_addch(sb, tolower(c));
 311                else {
 312                        assert(*msg_id);
 313                        strbuf_addch(sb, *(msg_id)++);
 314                }
 315        }
 316
 317        strbuf_addstr(sb, ": ");
 318}
 319
 320__attribute__((format (printf, 4, 5)))
 321static int report(struct fsck_options *options, struct object *object,
 322        enum fsck_msg_id id, const char *fmt, ...)
 323{
 324        va_list ap;
 325        struct strbuf sb = STRBUF_INIT;
 326        int msg_type = fsck_msg_type(id, options), result;
 327
 328        if (msg_type == FSCK_IGNORE)
 329                return 0;
 330
 331        if (options->skiplist && object &&
 332                        oid_array_lookup(options->skiplist, &object->oid) >= 0)
 333                return 0;
 334
 335        if (msg_type == FSCK_FATAL)
 336                msg_type = FSCK_ERROR;
 337        else if (msg_type == FSCK_INFO)
 338                msg_type = FSCK_WARN;
 339
 340        append_msg_id(&sb, msg_id_info[id].id_string);
 341
 342        va_start(ap, fmt);
 343        strbuf_vaddf(&sb, fmt, ap);
 344        result = options->error_func(options, object, msg_type, sb.buf);
 345        strbuf_release(&sb);
 346        va_end(ap);
 347
 348        return result;
 349}
 350
 351static char *get_object_name(struct fsck_options *options, struct object *obj)
 352{
 353        if (!options->object_names)
 354                return NULL;
 355        return lookup_decoration(options->object_names, obj);
 356}
 357
 358static void put_object_name(struct fsck_options *options, struct object *obj,
 359        const char *fmt, ...)
 360{
 361        va_list ap;
 362        struct strbuf buf = STRBUF_INIT;
 363        char *existing;
 364
 365        if (!options->object_names)
 366                return;
 367        existing = lookup_decoration(options->object_names, obj);
 368        if (existing)
 369                return;
 370        va_start(ap, fmt);
 371        strbuf_vaddf(&buf, fmt, ap);
 372        add_decoration(options->object_names, obj, strbuf_detach(&buf, NULL));
 373        va_end(ap);
 374}
 375
 376static const char *describe_object(struct fsck_options *o, struct object *obj)
 377{
 378        static struct strbuf buf = STRBUF_INIT;
 379        char *name;
 380
 381        strbuf_reset(&buf);
 382        strbuf_addstr(&buf, oid_to_hex(&obj->oid));
 383        if (o->object_names && (name = lookup_decoration(o->object_names, obj)))
 384                strbuf_addf(&buf, " (%s)", name);
 385
 386        return buf.buf;
 387}
 388
 389static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
 390{
 391        struct tree_desc desc;
 392        struct name_entry entry;
 393        int res = 0;
 394        const char *name;
 395
 396        if (parse_tree(tree))
 397                return -1;
 398
 399        name = get_object_name(options, &tree->object);
 400        if (init_tree_desc_gently(&desc, tree->buffer, tree->size))
 401                return -1;
 402        while (tree_entry_gently(&desc, &entry)) {
 403                struct object *obj;
 404                int result;
 405
 406                if (S_ISGITLINK(entry.mode))
 407                        continue;
 408
 409                if (S_ISDIR(entry.mode)) {
 410                        obj = (struct object *)lookup_tree(entry.oid);
 411                        if (name && obj)
 412                                put_object_name(options, obj, "%s%s/", name,
 413                                        entry.path);
 414                        result = options->walk(obj, OBJ_TREE, data, options);
 415                }
 416                else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
 417                        obj = (struct object *)lookup_blob(entry.oid);
 418                        if (name && obj)
 419                                put_object_name(options, obj, "%s%s", name,
 420                                        entry.path);
 421                        result = options->walk(obj, OBJ_BLOB, data, options);
 422                }
 423                else {
 424                        result = error("in tree %s: entry %s has bad mode %.6o",
 425                                        describe_object(options, &tree->object), entry.path, entry.mode);
 426                }
 427                if (result < 0)
 428                        return result;
 429                if (!res)
 430                        res = result;
 431        }
 432        return res;
 433}
 434
 435static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
 436{
 437        int counter = 0, generation = 0, name_prefix_len = 0;
 438        struct commit_list *parents;
 439        int res;
 440        int result;
 441        const char *name;
 442
 443        if (parse_commit(commit))
 444                return -1;
 445
 446        name = get_object_name(options, &commit->object);
 447        if (name)
 448                put_object_name(options, &get_commit_tree(commit)->object,
 449                                "%s:", name);
 450
 451        result = options->walk((struct object *)get_commit_tree(commit),
 452                               OBJ_TREE, data, options);
 453        if (result < 0)
 454                return result;
 455        res = result;
 456
 457        parents = commit->parents;
 458        if (name && parents) {
 459                int len = strlen(name), power;
 460
 461                if (len && name[len - 1] == '^') {
 462                        generation = 1;
 463                        name_prefix_len = len - 1;
 464                }
 465                else { /* parse ~<generation> suffix */
 466                        for (generation = 0, power = 1;
 467                             len && isdigit(name[len - 1]);
 468                             power *= 10)
 469                                generation += power * (name[--len] - '0');
 470                        if (power > 1 && len && name[len - 1] == '~')
 471                                name_prefix_len = len - 1;
 472                }
 473        }
 474
 475        while (parents) {
 476                if (name) {
 477                        struct object *obj = &parents->item->object;
 478
 479                        if (++counter > 1)
 480                                put_object_name(options, obj, "%s^%d",
 481                                        name, counter);
 482                        else if (generation > 0)
 483                                put_object_name(options, obj, "%.*s~%d",
 484                                        name_prefix_len, name, generation + 1);
 485                        else
 486                                put_object_name(options, obj, "%s^", name);
 487                }
 488                result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
 489                if (result < 0)
 490                        return result;
 491                if (!res)
 492                        res = result;
 493                parents = parents->next;
 494        }
 495        return res;
 496}
 497
 498static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
 499{
 500        char *name = get_object_name(options, &tag->object);
 501
 502        if (parse_tag(tag))
 503                return -1;
 504        if (name)
 505                put_object_name(options, tag->tagged, "%s", name);
 506        return options->walk(tag->tagged, OBJ_ANY, data, options);
 507}
 508
 509int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
 510{
 511        if (!obj)
 512                return -1;
 513
 514        if (obj->type == OBJ_NONE)
 515                parse_object(the_repository, &obj->oid);
 516
 517        switch (obj->type) {
 518        case OBJ_BLOB:
 519                return 0;
 520        case OBJ_TREE:
 521                return fsck_walk_tree((struct tree *)obj, data, options);
 522        case OBJ_COMMIT:
 523                return fsck_walk_commit((struct commit *)obj, data, options);
 524        case OBJ_TAG:
 525                return fsck_walk_tag((struct tag *)obj, data, options);
 526        default:
 527                error("Unknown object type for %s", describe_object(options, obj));
 528                return -1;
 529        }
 530}
 531
 532/*
 533 * The entries in a tree are ordered in the _path_ order,
 534 * which means that a directory entry is ordered by adding
 535 * a slash to the end of it.
 536 *
 537 * So a directory called "a" is ordered _after_ a file
 538 * called "a.c", because "a/" sorts after "a.c".
 539 */
 540#define TREE_UNORDERED (-1)
 541#define TREE_HAS_DUPS  (-2)
 542
 543static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
 544{
 545        int len1 = strlen(name1);
 546        int len2 = strlen(name2);
 547        int len = len1 < len2 ? len1 : len2;
 548        unsigned char c1, c2;
 549        int cmp;
 550
 551        cmp = memcmp(name1, name2, len);
 552        if (cmp < 0)
 553                return 0;
 554        if (cmp > 0)
 555                return TREE_UNORDERED;
 556
 557        /*
 558         * Ok, the first <len> characters are the same.
 559         * Now we need to order the next one, but turn
 560         * a '\0' into a '/' for a directory entry.
 561         */
 562        c1 = name1[len];
 563        c2 = name2[len];
 564        if (!c1 && !c2)
 565                /*
 566                 * git-write-tree used to write out a nonsense tree that has
 567                 * entries with the same name, one blob and one tree.  Make
 568                 * sure we do not have duplicate entries.
 569                 */
 570                return TREE_HAS_DUPS;
 571        if (!c1 && S_ISDIR(mode1))
 572                c1 = '/';
 573        if (!c2 && S_ISDIR(mode2))
 574                c2 = '/';
 575        return c1 < c2 ? 0 : TREE_UNORDERED;
 576}
 577
 578static int fsck_tree(struct tree *item, struct fsck_options *options)
 579{
 580        int retval = 0;
 581        int has_null_sha1 = 0;
 582        int has_full_path = 0;
 583        int has_empty_name = 0;
 584        int has_dot = 0;
 585        int has_dotdot = 0;
 586        int has_dotgit = 0;
 587        int has_zero_pad = 0;
 588        int has_bad_modes = 0;
 589        int has_dup_entries = 0;
 590        int not_properly_sorted = 0;
 591        struct tree_desc desc;
 592        unsigned o_mode;
 593        const char *o_name;
 594
 595        if (init_tree_desc_gently(&desc, item->buffer, item->size)) {
 596                retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 597                return retval;
 598        }
 599
 600        o_mode = 0;
 601        o_name = NULL;
 602
 603        while (desc.size) {
 604                unsigned mode;
 605                const char *name;
 606                const struct object_id *oid;
 607
 608                oid = tree_entry_extract(&desc, &name, &mode);
 609
 610                has_null_sha1 |= is_null_oid(oid);
 611                has_full_path |= !!strchr(name, '/');
 612                has_empty_name |= !*name;
 613                has_dot |= !strcmp(name, ".");
 614                has_dotdot |= !strcmp(name, "..");
 615                has_dotgit |= is_hfs_dotgit(name) || is_ntfs_dotgit(name);
 616                has_zero_pad |= *(char *)desc.buffer == '0';
 617
 618                if (is_hfs_dotgitmodules(name) || is_ntfs_dotgitmodules(name)) {
 619                        if (!S_ISLNK(mode))
 620                                oidset_insert(&gitmodules_found, oid);
 621                        else
 622                                retval += report(options, &item->object,
 623                                                 FSCK_MSG_GITMODULES_SYMLINK,
 624                                                 ".gitmodules is a symbolic link");
 625                }
 626
 627                if (update_tree_entry_gently(&desc)) {
 628                        retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 629                        break;
 630                }
 631
 632                switch (mode) {
 633                /*
 634                 * Standard modes..
 635                 */
 636                case S_IFREG | 0755:
 637                case S_IFREG | 0644:
 638                case S_IFLNK:
 639                case S_IFDIR:
 640                case S_IFGITLINK:
 641                        break;
 642                /*
 643                 * This is nonstandard, but we had a few of these
 644                 * early on when we honored the full set of mode
 645                 * bits..
 646                 */
 647                case S_IFREG | 0664:
 648                        if (!options->strict)
 649                                break;
 650                        /* fallthrough */
 651                default:
 652                        has_bad_modes = 1;
 653                }
 654
 655                if (o_name) {
 656                        switch (verify_ordered(o_mode, o_name, mode, name)) {
 657                        case TREE_UNORDERED:
 658                                not_properly_sorted = 1;
 659                                break;
 660                        case TREE_HAS_DUPS:
 661                                has_dup_entries = 1;
 662                                break;
 663                        default:
 664                                break;
 665                        }
 666                }
 667
 668                o_mode = mode;
 669                o_name = name;
 670        }
 671
 672        if (has_null_sha1)
 673                retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
 674        if (has_full_path)
 675                retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
 676        if (has_empty_name)
 677                retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
 678        if (has_dot)
 679                retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
 680        if (has_dotdot)
 681                retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
 682        if (has_dotgit)
 683                retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
 684        if (has_zero_pad)
 685                retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
 686        if (has_bad_modes)
 687                retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
 688        if (has_dup_entries)
 689                retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
 690        if (not_properly_sorted)
 691                retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
 692        return retval;
 693}
 694
 695static int verify_headers(const void *data, unsigned long size,
 696                          struct object *obj, struct fsck_options *options)
 697{
 698        const char *buffer = (const char *)data;
 699        unsigned long i;
 700
 701        for (i = 0; i < size; i++) {
 702                switch (buffer[i]) {
 703                case '\0':
 704                        return report(options, obj,
 705                                FSCK_MSG_NUL_IN_HEADER,
 706                                "unterminated header: NUL at offset %ld", i);
 707                case '\n':
 708                        if (i + 1 < size && buffer[i + 1] == '\n')
 709                                return 0;
 710                }
 711        }
 712
 713        /*
 714         * We did not find double-LF that separates the header
 715         * and the body.  Not having a body is not a crime but
 716         * we do want to see the terminating LF for the last header
 717         * line.
 718         */
 719        if (size && buffer[size - 1] == '\n')
 720                return 0;
 721
 722        return report(options, obj,
 723                FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
 724}
 725
 726static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
 727{
 728        const char *p = *ident;
 729        char *end;
 730
 731        *ident = strchrnul(*ident, '\n');
 732        if (**ident == '\n')
 733                (*ident)++;
 734
 735        if (*p == '<')
 736                return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 737        p += strcspn(p, "<>\n");
 738        if (*p == '>')
 739                return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
 740        if (*p != '<')
 741                return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
 742        if (p[-1] != ' ')
 743                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 744        p++;
 745        p += strcspn(p, "<>\n");
 746        if (*p != '>')
 747                return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
 748        p++;
 749        if (*p != ' ')
 750                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
 751        p++;
 752        if (*p == '0' && p[1] != ' ')
 753                return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
 754        if (date_overflows(parse_timestamp(p, &end, 10)))
 755                return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
 756        if ((end == p || *end != ' '))
 757                return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
 758        p = end + 1;
 759        if ((*p != '+' && *p != '-') ||
 760            !isdigit(p[1]) ||
 761            !isdigit(p[2]) ||
 762            !isdigit(p[3]) ||
 763            !isdigit(p[4]) ||
 764            (p[5] != '\n'))
 765                return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
 766        p += 6;
 767        return 0;
 768}
 769
 770static int fsck_commit_buffer(struct commit *commit, const char *buffer,
 771        unsigned long size, struct fsck_options *options)
 772{
 773        struct object_id tree_oid, oid;
 774        struct commit_graft *graft;
 775        unsigned parent_count, parent_line_count = 0, author_count;
 776        int err;
 777        const char *buffer_begin = buffer;
 778        const char *p;
 779
 780        if (verify_headers(buffer, size, &commit->object, options))
 781                return -1;
 782
 783        if (!skip_prefix(buffer, "tree ", &buffer))
 784                return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
 785        if (parse_oid_hex(buffer, &tree_oid, &p) || *p != '\n') {
 786                err = report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
 787                if (err)
 788                        return err;
 789        }
 790        buffer = p + 1;
 791        while (skip_prefix(buffer, "parent ", &buffer)) {
 792                if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
 793                        err = report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
 794                        if (err)
 795                                return err;
 796                }
 797                buffer = p + 1;
 798                parent_line_count++;
 799        }
 800        graft = lookup_commit_graft(the_repository, &commit->object.oid);
 801        parent_count = commit_list_count(commit->parents);
 802        if (graft) {
 803                if (graft->nr_parent == -1 && !parent_count)
 804                        ; /* shallow commit */
 805                else if (graft->nr_parent != parent_count) {
 806                        err = report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
 807                        if (err)
 808                                return err;
 809                }
 810        } else {
 811                if (parent_count != parent_line_count) {
 812                        err = report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
 813                        if (err)
 814                                return err;
 815                }
 816        }
 817        author_count = 0;
 818        while (skip_prefix(buffer, "author ", &buffer)) {
 819                author_count++;
 820                err = fsck_ident(&buffer, &commit->object, options);
 821                if (err)
 822                        return err;
 823        }
 824        if (author_count < 1)
 825                err = report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
 826        else if (author_count > 1)
 827                err = report(options, &commit->object, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
 828        if (err)
 829                return err;
 830        if (!skip_prefix(buffer, "committer ", &buffer))
 831                return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
 832        err = fsck_ident(&buffer, &commit->object, options);
 833        if (err)
 834                return err;
 835        if (!get_commit_tree(commit)) {
 836                err = report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", oid_to_hex(&tree_oid));
 837                if (err)
 838                        return err;
 839        }
 840        if (memchr(buffer_begin, '\0', size)) {
 841                err = report(options, &commit->object, FSCK_MSG_NUL_IN_COMMIT,
 842                             "NUL byte in the commit object body");
 843                if (err)
 844                        return err;
 845        }
 846        return 0;
 847}
 848
 849static int fsck_commit(struct commit *commit, const char *data,
 850        unsigned long size, struct fsck_options *options)
 851{
 852        const char *buffer = data ?  data : get_commit_buffer(commit, &size);
 853        int ret = fsck_commit_buffer(commit, buffer, size, options);
 854        if (!data)
 855                unuse_commit_buffer(commit, buffer);
 856        return ret;
 857}
 858
 859static int fsck_tag_buffer(struct tag *tag, const char *data,
 860        unsigned long size, struct fsck_options *options)
 861{
 862        struct object_id oid;
 863        int ret = 0;
 864        const char *buffer;
 865        char *to_free = NULL, *eol;
 866        struct strbuf sb = STRBUF_INIT;
 867        const char *p;
 868
 869        if (data)
 870                buffer = data;
 871        else {
 872                enum object_type type;
 873
 874                buffer = to_free =
 875                        read_object_file(&tag->object.oid, &type, &size);
 876                if (!buffer)
 877                        return report(options, &tag->object,
 878                                FSCK_MSG_MISSING_TAG_OBJECT,
 879                                "cannot read tag object");
 880
 881                if (type != OBJ_TAG) {
 882                        ret = report(options, &tag->object,
 883                                FSCK_MSG_TAG_OBJECT_NOT_TAG,
 884                                "expected tag got %s",
 885                            type_name(type));
 886                        goto done;
 887                }
 888        }
 889
 890        ret = verify_headers(buffer, size, &tag->object, options);
 891        if (ret)
 892                goto done;
 893
 894        if (!skip_prefix(buffer, "object ", &buffer)) {
 895                ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
 896                goto done;
 897        }
 898        if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
 899                ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
 900                if (ret)
 901                        goto done;
 902        }
 903        buffer = p + 1;
 904
 905        if (!skip_prefix(buffer, "type ", &buffer)) {
 906                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
 907                goto done;
 908        }
 909        eol = strchr(buffer, '\n');
 910        if (!eol) {
 911                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
 912                goto done;
 913        }
 914        if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
 915                ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
 916        if (ret)
 917                goto done;
 918        buffer = eol + 1;
 919
 920        if (!skip_prefix(buffer, "tag ", &buffer)) {
 921                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
 922                goto done;
 923        }
 924        eol = strchr(buffer, '\n');
 925        if (!eol) {
 926                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
 927                goto done;
 928        }
 929        strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
 930        if (check_refname_format(sb.buf, 0)) {
 931                ret = report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
 932                           "invalid 'tag' name: %.*s",
 933                           (int)(eol - buffer), buffer);
 934                if (ret)
 935                        goto done;
 936        }
 937        buffer = eol + 1;
 938
 939        if (!skip_prefix(buffer, "tagger ", &buffer)) {
 940                /* early tags do not contain 'tagger' lines; warn only */
 941                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
 942                if (ret)
 943                        goto done;
 944        }
 945        else
 946                ret = fsck_ident(&buffer, &tag->object, options);
 947
 948done:
 949        strbuf_release(&sb);
 950        free(to_free);
 951        return ret;
 952}
 953
 954static int fsck_tag(struct tag *tag, const char *data,
 955        unsigned long size, struct fsck_options *options)
 956{
 957        struct object *tagged = tag->tagged;
 958
 959        if (!tagged)
 960                return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
 961
 962        return fsck_tag_buffer(tag, data, size, options);
 963}
 964
 965struct fsck_gitmodules_data {
 966        struct object *obj;
 967        struct fsck_options *options;
 968        int ret;
 969};
 970
 971static int fsck_gitmodules_fn(const char *var, const char *value, void *vdata)
 972{
 973        struct fsck_gitmodules_data *data = vdata;
 974        const char *subsection, *key;
 975        int subsection_len;
 976        char *name;
 977
 978        if (parse_config_key(var, "submodule", &subsection, &subsection_len, &key) < 0 ||
 979            !subsection)
 980                return 0;
 981
 982        name = xmemdupz(subsection, subsection_len);
 983        if (check_submodule_name(name) < 0)
 984                data->ret |= report(data->options, data->obj,
 985                                    FSCK_MSG_GITMODULES_NAME,
 986                                    "disallowed submodule name: %s",
 987                                    name);
 988        free(name);
 989
 990        return 0;
 991}
 992
 993static int fsck_blob(struct blob *blob, const char *buf,
 994                     unsigned long size, struct fsck_options *options)
 995{
 996        struct fsck_gitmodules_data data;
 997
 998        if (!oidset_contains(&gitmodules_found, &blob->object.oid))
 999                return 0;
1000        oidset_insert(&gitmodules_done, &blob->object.oid);
1001
1002        if (!buf) {
1003                /*
1004                 * A missing buffer here is a sign that the caller found the
1005                 * blob too gigantic to load into memory. Let's just consider
1006                 * that an error.
1007                 */
1008                return report(options, &blob->object,
1009                              FSCK_MSG_GITMODULES_PARSE,
1010                              ".gitmodules too large to parse");
1011        }
1012
1013        data.obj = &blob->object;
1014        data.options = options;
1015        data.ret = 0;
1016        if (git_config_from_mem(fsck_gitmodules_fn, CONFIG_ORIGIN_BLOB,
1017                                ".gitmodules", buf, size, &data))
1018                data.ret |= report(options, &blob->object,
1019                                   FSCK_MSG_GITMODULES_PARSE,
1020                                   "could not parse gitmodules blob");
1021
1022        return data.ret;
1023}
1024
1025int fsck_object(struct object *obj, void *data, unsigned long size,
1026        struct fsck_options *options)
1027{
1028        if (!obj)
1029                return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
1030
1031        if (obj->type == OBJ_BLOB)
1032                return fsck_blob((struct blob *)obj, data, size, options);
1033        if (obj->type == OBJ_TREE)
1034                return fsck_tree((struct tree *) obj, options);
1035        if (obj->type == OBJ_COMMIT)
1036                return fsck_commit((struct commit *) obj, (const char *) data,
1037                        size, options);
1038        if (obj->type == OBJ_TAG)
1039                return fsck_tag((struct tag *) obj, (const char *) data,
1040                        size, options);
1041
1042        return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
1043                          obj->type);
1044}
1045
1046int fsck_error_function(struct fsck_options *o,
1047        struct object *obj, int msg_type, const char *message)
1048{
1049        if (msg_type == FSCK_WARN) {
1050                warning("object %s: %s", describe_object(o, obj), message);
1051                return 0;
1052        }
1053        error("object %s: %s", describe_object(o, obj), message);
1054        return 1;
1055}
1056
1057int fsck_finish(struct fsck_options *options)
1058{
1059        int ret = 0;
1060        struct oidset_iter iter;
1061        const struct object_id *oid;
1062
1063        oidset_iter_init(&gitmodules_found, &iter);
1064        while ((oid = oidset_iter_next(&iter))) {
1065                struct blob *blob;
1066                enum object_type type;
1067                unsigned long size;
1068                char *buf;
1069
1070                if (oidset_contains(&gitmodules_done, oid))
1071                        continue;
1072
1073                blob = lookup_blob(oid);
1074                if (!blob) {
1075                        struct object *obj = lookup_unknown_object(oid->hash);
1076                        ret |= report(options, obj,
1077                                      FSCK_MSG_GITMODULES_BLOB,
1078                                      "non-blob found at .gitmodules");
1079                        continue;
1080                }
1081
1082                buf = read_object_file(oid, &type, &size);
1083                if (!buf) {
1084                        if (is_promisor_object(&blob->object.oid))
1085                                continue;
1086                        ret |= report(options, &blob->object,
1087                                      FSCK_MSG_GITMODULES_MISSING,
1088                                      "unable to read .gitmodules blob");
1089                        continue;
1090                }
1091
1092                if (type == OBJ_BLOB)
1093                        ret |= fsck_blob(blob, buf, size, options);
1094                else
1095                        ret |= report(options, &blob->object,
1096                                      FSCK_MSG_GITMODULES_BLOB,
1097                                      "non-blob found at .gitmodules");
1098                free(buf);
1099        }
1100
1101
1102        oidset_clear(&gitmodules_found);
1103        oidset_clear(&gitmodules_done);
1104        return ret;
1105}