Andrew's git / gitweb.git / fsck.c
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fsck.con commit Merge branch 'ts/doc-build-manpage-xsl-quietly' into maint (7532a18)
   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_LARGE, ERROR) \
  68        FUNC(GITMODULES_NAME, ERROR) \
  69        FUNC(GITMODULES_SYMLINK, ERROR) \
  70        FUNC(GITMODULES_URL, ERROR) \
  71        FUNC(GITMODULES_PATH, ERROR) \
  72        /* warnings */ \
  73        FUNC(BAD_FILEMODE, WARN) \
  74        FUNC(EMPTY_NAME, WARN) \
  75        FUNC(FULL_PATHNAME, WARN) \
  76        FUNC(HAS_DOT, WARN) \
  77        FUNC(HAS_DOTDOT, WARN) \
  78        FUNC(HAS_DOTGIT, WARN) \
  79        FUNC(NULL_SHA1, WARN) \
  80        FUNC(ZERO_PADDED_FILEMODE, WARN) \
  81        FUNC(NUL_IN_COMMIT, WARN) \
  82        /* infos (reported as warnings, but ignored by default) */ \
  83        FUNC(GITMODULES_PARSE, INFO) \
  84        FUNC(BAD_TAG_NAME, INFO) \
  85        FUNC(MISSING_TAGGER_ENTRY, INFO)
  86
  87#define MSG_ID(id, msg_type) FSCK_MSG_##id,
  88enum fsck_msg_id {
  89        FOREACH_MSG_ID(MSG_ID)
  90        FSCK_MSG_MAX
  91};
  92#undef MSG_ID
  93
  94#define STR(x) #x
  95#define MSG_ID(id, msg_type) { STR(id), NULL, NULL, FSCK_##msg_type },
  96static struct {
  97        const char *id_string;
  98        const char *downcased;
  99        const char *camelcased;
 100        int msg_type;
 101} msg_id_info[FSCK_MSG_MAX + 1] = {
 102        FOREACH_MSG_ID(MSG_ID)
 103        { NULL, NULL, NULL, -1 }
 104};
 105#undef MSG_ID
 106
 107static void prepare_msg_ids(void)
 108{
 109        int i;
 110
 111        if (msg_id_info[0].downcased)
 112                return;
 113
 114        /* convert id_string to lower case, without underscores. */
 115        for (i = 0; i < FSCK_MSG_MAX; i++) {
 116                const char *p = msg_id_info[i].id_string;
 117                int len = strlen(p);
 118                char *q = xmalloc(len);
 119
 120                msg_id_info[i].downcased = q;
 121                while (*p)
 122                        if (*p == '_')
 123                                p++;
 124                        else
 125                                *(q)++ = tolower(*(p)++);
 126                *q = '\0';
 127
 128                p = msg_id_info[i].id_string;
 129                q = xmalloc(len);
 130                msg_id_info[i].camelcased = q;
 131                while (*p) {
 132                        if (*p == '_') {
 133                                p++;
 134                                if (*p)
 135                                        *q++ = *p++;
 136                        } else {
 137                                *q++ = tolower(*p++);
 138                        }
 139                }
 140                *q = '\0';
 141        }
 142}
 143
 144static int parse_msg_id(const char *text)
 145{
 146        int i;
 147
 148        prepare_msg_ids();
 149
 150        for (i = 0; i < FSCK_MSG_MAX; i++)
 151                if (!strcmp(text, msg_id_info[i].downcased))
 152                        return i;
 153
 154        return -1;
 155}
 156
 157void list_config_fsck_msg_ids(struct string_list *list, const char *prefix)
 158{
 159        int i;
 160
 161        prepare_msg_ids();
 162
 163        for (i = 0; i < FSCK_MSG_MAX; i++)
 164                list_config_item(list, prefix, msg_id_info[i].camelcased);
 165}
 166
 167static int fsck_msg_type(enum fsck_msg_id msg_id,
 168        struct fsck_options *options)
 169{
 170        int msg_type;
 171
 172        assert(msg_id >= 0 && msg_id < FSCK_MSG_MAX);
 173
 174        if (options->msg_type)
 175                msg_type = options->msg_type[msg_id];
 176        else {
 177                msg_type = msg_id_info[msg_id].msg_type;
 178                if (options->strict && msg_type == FSCK_WARN)
 179                        msg_type = FSCK_ERROR;
 180        }
 181
 182        return msg_type;
 183}
 184
 185static void init_skiplist(struct fsck_options *options, const char *path)
 186{
 187        static struct oid_array skiplist = OID_ARRAY_INIT;
 188        int sorted, fd;
 189        char buffer[GIT_MAX_HEXSZ + 1];
 190        struct object_id oid;
 191
 192        if (options->skiplist)
 193                sorted = options->skiplist->sorted;
 194        else {
 195                sorted = 1;
 196                options->skiplist = &skiplist;
 197        }
 198
 199        fd = open(path, O_RDONLY);
 200        if (fd < 0)
 201                die("Could not open skip list: %s", path);
 202        for (;;) {
 203                const char *p;
 204                int result = read_in_full(fd, buffer, sizeof(buffer));
 205                if (result < 0)
 206                        die_errno("Could not read '%s'", path);
 207                if (!result)
 208                        break;
 209                if (parse_oid_hex(buffer, &oid, &p) || *p != '\n')
 210                        die("Invalid SHA-1: %s", buffer);
 211                oid_array_append(&skiplist, &oid);
 212                if (sorted && skiplist.nr > 1 &&
 213                                oidcmp(&skiplist.oid[skiplist.nr - 2],
 214                                       &oid) > 0)
 215                        sorted = 0;
 216        }
 217        close(fd);
 218
 219        if (sorted)
 220                skiplist.sorted = 1;
 221}
 222
 223static int parse_msg_type(const char *str)
 224{
 225        if (!strcmp(str, "error"))
 226                return FSCK_ERROR;
 227        else if (!strcmp(str, "warn"))
 228                return FSCK_WARN;
 229        else if (!strcmp(str, "ignore"))
 230                return FSCK_IGNORE;
 231        else
 232                die("Unknown fsck message type: '%s'", str);
 233}
 234
 235int is_valid_msg_type(const char *msg_id, const char *msg_type)
 236{
 237        if (parse_msg_id(msg_id) < 0)
 238                return 0;
 239        parse_msg_type(msg_type);
 240        return 1;
 241}
 242
 243void fsck_set_msg_type(struct fsck_options *options,
 244                const char *msg_id, const char *msg_type)
 245{
 246        int id = parse_msg_id(msg_id), type;
 247
 248        if (id < 0)
 249                die("Unhandled message id: %s", msg_id);
 250        type = parse_msg_type(msg_type);
 251
 252        if (type != FSCK_ERROR && msg_id_info[id].msg_type == FSCK_FATAL)
 253                die("Cannot demote %s to %s", msg_id, msg_type);
 254
 255        if (!options->msg_type) {
 256                int i;
 257                int *msg_type;
 258                ALLOC_ARRAY(msg_type, FSCK_MSG_MAX);
 259                for (i = 0; i < FSCK_MSG_MAX; i++)
 260                        msg_type[i] = fsck_msg_type(i, options);
 261                options->msg_type = msg_type;
 262        }
 263
 264        options->msg_type[id] = type;
 265}
 266
 267void fsck_set_msg_types(struct fsck_options *options, const char *values)
 268{
 269        char *buf = xstrdup(values), *to_free = buf;
 270        int done = 0;
 271
 272        while (!done) {
 273                int len = strcspn(buf, " ,|"), equal;
 274
 275                done = !buf[len];
 276                if (!len) {
 277                        buf++;
 278                        continue;
 279                }
 280                buf[len] = '\0';
 281
 282                for (equal = 0;
 283                     equal < len && buf[equal] != '=' && buf[equal] != ':';
 284                     equal++)
 285                        buf[equal] = tolower(buf[equal]);
 286                buf[equal] = '\0';
 287
 288                if (!strcmp(buf, "skiplist")) {
 289                        if (equal == len)
 290                                die("skiplist requires a path");
 291                        init_skiplist(options, buf + equal + 1);
 292                        buf += len + 1;
 293                        continue;
 294                }
 295
 296                if (equal == len)
 297                        die("Missing '=': '%s'", buf);
 298
 299                fsck_set_msg_type(options, buf, buf + equal + 1);
 300                buf += len + 1;
 301        }
 302        free(to_free);
 303}
 304
 305static void append_msg_id(struct strbuf *sb, const char *msg_id)
 306{
 307        for (;;) {
 308                char c = *(msg_id)++;
 309
 310                if (!c)
 311                        break;
 312                if (c != '_')
 313                        strbuf_addch(sb, tolower(c));
 314                else {
 315                        assert(*msg_id);
 316                        strbuf_addch(sb, *(msg_id)++);
 317                }
 318        }
 319
 320        strbuf_addstr(sb, ": ");
 321}
 322
 323static int object_on_skiplist(struct fsck_options *opts, struct object *obj)
 324{
 325        if (opts && opts->skiplist && obj)
 326                return oid_array_lookup(opts->skiplist, &obj->oid) >= 0;
 327        return 0;
 328}
 329
 330__attribute__((format (printf, 4, 5)))
 331static int report(struct fsck_options *options, struct object *object,
 332        enum fsck_msg_id id, const char *fmt, ...)
 333{
 334        va_list ap;
 335        struct strbuf sb = STRBUF_INIT;
 336        int msg_type = fsck_msg_type(id, options), result;
 337
 338        if (msg_type == FSCK_IGNORE)
 339                return 0;
 340
 341        if (object_on_skiplist(options, object))
 342                return 0;
 343
 344        if (msg_type == FSCK_FATAL)
 345                msg_type = FSCK_ERROR;
 346        else if (msg_type == FSCK_INFO)
 347                msg_type = FSCK_WARN;
 348
 349        append_msg_id(&sb, msg_id_info[id].id_string);
 350
 351        va_start(ap, fmt);
 352        strbuf_vaddf(&sb, fmt, ap);
 353        result = options->error_func(options, object, msg_type, sb.buf);
 354        strbuf_release(&sb);
 355        va_end(ap);
 356
 357        return result;
 358}
 359
 360static char *get_object_name(struct fsck_options *options, struct object *obj)
 361{
 362        if (!options->object_names)
 363                return NULL;
 364        return lookup_decoration(options->object_names, obj);
 365}
 366
 367static void put_object_name(struct fsck_options *options, struct object *obj,
 368        const char *fmt, ...)
 369{
 370        va_list ap;
 371        struct strbuf buf = STRBUF_INIT;
 372        char *existing;
 373
 374        if (!options->object_names)
 375                return;
 376        existing = lookup_decoration(options->object_names, obj);
 377        if (existing)
 378                return;
 379        va_start(ap, fmt);
 380        strbuf_vaddf(&buf, fmt, ap);
 381        add_decoration(options->object_names, obj, strbuf_detach(&buf, NULL));
 382        va_end(ap);
 383}
 384
 385static const char *describe_object(struct fsck_options *o, struct object *obj)
 386{
 387        static struct strbuf buf = STRBUF_INIT;
 388        char *name;
 389
 390        strbuf_reset(&buf);
 391        strbuf_addstr(&buf, oid_to_hex(&obj->oid));
 392        if (o->object_names && (name = lookup_decoration(o->object_names, obj)))
 393                strbuf_addf(&buf, " (%s)", name);
 394
 395        return buf.buf;
 396}
 397
 398static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
 399{
 400        struct tree_desc desc;
 401        struct name_entry entry;
 402        int res = 0;
 403        const char *name;
 404
 405        if (parse_tree(tree))
 406                return -1;
 407
 408        name = get_object_name(options, &tree->object);
 409        if (init_tree_desc_gently(&desc, tree->buffer, tree->size))
 410                return -1;
 411        while (tree_entry_gently(&desc, &entry)) {
 412                struct object *obj;
 413                int result;
 414
 415                if (S_ISGITLINK(entry.mode))
 416                        continue;
 417
 418                if (S_ISDIR(entry.mode)) {
 419                        obj = (struct object *)lookup_tree(the_repository, entry.oid);
 420                        if (name && obj)
 421                                put_object_name(options, obj, "%s%s/", name,
 422                                        entry.path);
 423                        result = options->walk(obj, OBJ_TREE, data, options);
 424                }
 425                else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
 426                        obj = (struct object *)lookup_blob(the_repository, entry.oid);
 427                        if (name && obj)
 428                                put_object_name(options, obj, "%s%s", name,
 429                                        entry.path);
 430                        result = options->walk(obj, OBJ_BLOB, data, options);
 431                }
 432                else {
 433                        result = error("in tree %s: entry %s has bad mode %.6o",
 434                                        describe_object(options, &tree->object), entry.path, entry.mode);
 435                }
 436                if (result < 0)
 437                        return result;
 438                if (!res)
 439                        res = result;
 440        }
 441        return res;
 442}
 443
 444static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
 445{
 446        int counter = 0, generation = 0, name_prefix_len = 0;
 447        struct commit_list *parents;
 448        int res;
 449        int result;
 450        const char *name;
 451
 452        if (parse_commit(commit))
 453                return -1;
 454
 455        name = get_object_name(options, &commit->object);
 456        if (name)
 457                put_object_name(options, &get_commit_tree(commit)->object,
 458                                "%s:", name);
 459
 460        result = options->walk((struct object *)get_commit_tree(commit),
 461                               OBJ_TREE, data, options);
 462        if (result < 0)
 463                return result;
 464        res = result;
 465
 466        parents = commit->parents;
 467        if (name && parents) {
 468                int len = strlen(name), power;
 469
 470                if (len && name[len - 1] == '^') {
 471                        generation = 1;
 472                        name_prefix_len = len - 1;
 473                }
 474                else { /* parse ~<generation> suffix */
 475                        for (generation = 0, power = 1;
 476                             len && isdigit(name[len - 1]);
 477                             power *= 10)
 478                                generation += power * (name[--len] - '0');
 479                        if (power > 1 && len && name[len - 1] == '~')
 480                                name_prefix_len = len - 1;
 481                }
 482        }
 483
 484        while (parents) {
 485                if (name) {
 486                        struct object *obj = &parents->item->object;
 487
 488                        if (++counter > 1)
 489                                put_object_name(options, obj, "%s^%d",
 490                                        name, counter);
 491                        else if (generation > 0)
 492                                put_object_name(options, obj, "%.*s~%d",
 493                                        name_prefix_len, name, generation + 1);
 494                        else
 495                                put_object_name(options, obj, "%s^", name);
 496                }
 497                result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
 498                if (result < 0)
 499                        return result;
 500                if (!res)
 501                        res = result;
 502                parents = parents->next;
 503        }
 504        return res;
 505}
 506
 507static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
 508{
 509        char *name = get_object_name(options, &tag->object);
 510
 511        if (parse_tag(tag))
 512                return -1;
 513        if (name)
 514                put_object_name(options, tag->tagged, "%s", name);
 515        return options->walk(tag->tagged, OBJ_ANY, data, options);
 516}
 517
 518int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
 519{
 520        if (!obj)
 521                return -1;
 522
 523        if (obj->type == OBJ_NONE)
 524                parse_object(the_repository, &obj->oid);
 525
 526        switch (obj->type) {
 527        case OBJ_BLOB:
 528                return 0;
 529        case OBJ_TREE:
 530                return fsck_walk_tree((struct tree *)obj, data, options);
 531        case OBJ_COMMIT:
 532                return fsck_walk_commit((struct commit *)obj, data, options);
 533        case OBJ_TAG:
 534                return fsck_walk_tag((struct tag *)obj, data, options);
 535        default:
 536                error("Unknown object type for %s", describe_object(options, obj));
 537                return -1;
 538        }
 539}
 540
 541/*
 542 * The entries in a tree are ordered in the _path_ order,
 543 * which means that a directory entry is ordered by adding
 544 * a slash to the end of it.
 545 *
 546 * So a directory called "a" is ordered _after_ a file
 547 * called "a.c", because "a/" sorts after "a.c".
 548 */
 549#define TREE_UNORDERED (-1)
 550#define TREE_HAS_DUPS  (-2)
 551
 552static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
 553{
 554        int len1 = strlen(name1);
 555        int len2 = strlen(name2);
 556        int len = len1 < len2 ? len1 : len2;
 557        unsigned char c1, c2;
 558        int cmp;
 559
 560        cmp = memcmp(name1, name2, len);
 561        if (cmp < 0)
 562                return 0;
 563        if (cmp > 0)
 564                return TREE_UNORDERED;
 565
 566        /*
 567         * Ok, the first <len> characters are the same.
 568         * Now we need to order the next one, but turn
 569         * a '\0' into a '/' for a directory entry.
 570         */
 571        c1 = name1[len];
 572        c2 = name2[len];
 573        if (!c1 && !c2)
 574                /*
 575                 * git-write-tree used to write out a nonsense tree that has
 576                 * entries with the same name, one blob and one tree.  Make
 577                 * sure we do not have duplicate entries.
 578                 */
 579                return TREE_HAS_DUPS;
 580        if (!c1 && S_ISDIR(mode1))
 581                c1 = '/';
 582        if (!c2 && S_ISDIR(mode2))
 583                c2 = '/';
 584        return c1 < c2 ? 0 : TREE_UNORDERED;
 585}
 586
 587static int fsck_tree(struct tree *item, struct fsck_options *options)
 588{
 589        int retval = 0;
 590        int has_null_sha1 = 0;
 591        int has_full_path = 0;
 592        int has_empty_name = 0;
 593        int has_dot = 0;
 594        int has_dotdot = 0;
 595        int has_dotgit = 0;
 596        int has_zero_pad = 0;
 597        int has_bad_modes = 0;
 598        int has_dup_entries = 0;
 599        int not_properly_sorted = 0;
 600        struct tree_desc desc;
 601        unsigned o_mode;
 602        const char *o_name;
 603
 604        if (init_tree_desc_gently(&desc, item->buffer, item->size)) {
 605                retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 606                return retval;
 607        }
 608
 609        o_mode = 0;
 610        o_name = NULL;
 611
 612        while (desc.size) {
 613                unsigned mode;
 614                const char *name;
 615                const struct object_id *oid;
 616
 617                oid = tree_entry_extract(&desc, &name, &mode);
 618
 619                has_null_sha1 |= is_null_oid(oid);
 620                has_full_path |= !!strchr(name, '/');
 621                has_empty_name |= !*name;
 622                has_dot |= !strcmp(name, ".");
 623                has_dotdot |= !strcmp(name, "..");
 624                has_dotgit |= is_hfs_dotgit(name) || is_ntfs_dotgit(name);
 625                has_zero_pad |= *(char *)desc.buffer == '0';
 626
 627                if (is_hfs_dotgitmodules(name) || is_ntfs_dotgitmodules(name)) {
 628                        if (!S_ISLNK(mode))
 629                                oidset_insert(&gitmodules_found, oid);
 630                        else
 631                                retval += report(options, &item->object,
 632                                                 FSCK_MSG_GITMODULES_SYMLINK,
 633                                                 ".gitmodules is a symbolic link");
 634                }
 635
 636                if (update_tree_entry_gently(&desc)) {
 637                        retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 638                        break;
 639                }
 640
 641                switch (mode) {
 642                /*
 643                 * Standard modes..
 644                 */
 645                case S_IFREG | 0755:
 646                case S_IFREG | 0644:
 647                case S_IFLNK:
 648                case S_IFDIR:
 649                case S_IFGITLINK:
 650                        break;
 651                /*
 652                 * This is nonstandard, but we had a few of these
 653                 * early on when we honored the full set of mode
 654                 * bits..
 655                 */
 656                case S_IFREG | 0664:
 657                        if (!options->strict)
 658                                break;
 659                        /* fallthrough */
 660                default:
 661                        has_bad_modes = 1;
 662                }
 663
 664                if (o_name) {
 665                        switch (verify_ordered(o_mode, o_name, mode, name)) {
 666                        case TREE_UNORDERED:
 667                                not_properly_sorted = 1;
 668                                break;
 669                        case TREE_HAS_DUPS:
 670                                has_dup_entries = 1;
 671                                break;
 672                        default:
 673                                break;
 674                        }
 675                }
 676
 677                o_mode = mode;
 678                o_name = name;
 679        }
 680
 681        if (has_null_sha1)
 682                retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
 683        if (has_full_path)
 684                retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
 685        if (has_empty_name)
 686                retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
 687        if (has_dot)
 688                retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
 689        if (has_dotdot)
 690                retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
 691        if (has_dotgit)
 692                retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
 693        if (has_zero_pad)
 694                retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
 695        if (has_bad_modes)
 696                retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
 697        if (has_dup_entries)
 698                retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
 699        if (not_properly_sorted)
 700                retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
 701        return retval;
 702}
 703
 704static int verify_headers(const void *data, unsigned long size,
 705                          struct object *obj, struct fsck_options *options)
 706{
 707        const char *buffer = (const char *)data;
 708        unsigned long i;
 709
 710        for (i = 0; i < size; i++) {
 711                switch (buffer[i]) {
 712                case '\0':
 713                        return report(options, obj,
 714                                FSCK_MSG_NUL_IN_HEADER,
 715                                "unterminated header: NUL at offset %ld", i);
 716                case '\n':
 717                        if (i + 1 < size && buffer[i + 1] == '\n')
 718                                return 0;
 719                }
 720        }
 721
 722        /*
 723         * We did not find double-LF that separates the header
 724         * and the body.  Not having a body is not a crime but
 725         * we do want to see the terminating LF for the last header
 726         * line.
 727         */
 728        if (size && buffer[size - 1] == '\n')
 729                return 0;
 730
 731        return report(options, obj,
 732                FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
 733}
 734
 735static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
 736{
 737        const char *p = *ident;
 738        char *end;
 739
 740        *ident = strchrnul(*ident, '\n');
 741        if (**ident == '\n')
 742                (*ident)++;
 743
 744        if (*p == '<')
 745                return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 746        p += strcspn(p, "<>\n");
 747        if (*p == '>')
 748                return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
 749        if (*p != '<')
 750                return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
 751        if (p[-1] != ' ')
 752                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 753        p++;
 754        p += strcspn(p, "<>\n");
 755        if (*p != '>')
 756                return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
 757        p++;
 758        if (*p != ' ')
 759                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
 760        p++;
 761        if (*p == '0' && p[1] != ' ')
 762                return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
 763        if (date_overflows(parse_timestamp(p, &end, 10)))
 764                return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
 765        if ((end == p || *end != ' '))
 766                return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
 767        p = end + 1;
 768        if ((*p != '+' && *p != '-') ||
 769            !isdigit(p[1]) ||
 770            !isdigit(p[2]) ||
 771            !isdigit(p[3]) ||
 772            !isdigit(p[4]) ||
 773            (p[5] != '\n'))
 774                return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
 775        p += 6;
 776        return 0;
 777}
 778
 779static int fsck_commit_buffer(struct commit *commit, const char *buffer,
 780        unsigned long size, struct fsck_options *options)
 781{
 782        struct object_id tree_oid, oid;
 783        struct commit_graft *graft;
 784        unsigned parent_count, parent_line_count = 0, author_count;
 785        int err;
 786        const char *buffer_begin = buffer;
 787        const char *p;
 788
 789        if (verify_headers(buffer, size, &commit->object, options))
 790                return -1;
 791
 792        if (!skip_prefix(buffer, "tree ", &buffer))
 793                return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
 794        if (parse_oid_hex(buffer, &tree_oid, &p) || *p != '\n') {
 795                err = report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
 796                if (err)
 797                        return err;
 798        }
 799        buffer = p + 1;
 800        while (skip_prefix(buffer, "parent ", &buffer)) {
 801                if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
 802                        err = report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
 803                        if (err)
 804                                return err;
 805                }
 806                buffer = p + 1;
 807                parent_line_count++;
 808        }
 809        graft = lookup_commit_graft(the_repository, &commit->object.oid);
 810        parent_count = commit_list_count(commit->parents);
 811        if (graft) {
 812                if (graft->nr_parent == -1 && !parent_count)
 813                        ; /* shallow commit */
 814                else if (graft->nr_parent != parent_count) {
 815                        err = report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
 816                        if (err)
 817                                return err;
 818                }
 819        } else {
 820                if (parent_count != parent_line_count) {
 821                        err = report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
 822                        if (err)
 823                                return err;
 824                }
 825        }
 826        author_count = 0;
 827        while (skip_prefix(buffer, "author ", &buffer)) {
 828                author_count++;
 829                err = fsck_ident(&buffer, &commit->object, options);
 830                if (err)
 831                        return err;
 832        }
 833        if (author_count < 1)
 834                err = report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
 835        else if (author_count > 1)
 836                err = report(options, &commit->object, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
 837        if (err)
 838                return err;
 839        if (!skip_prefix(buffer, "committer ", &buffer))
 840                return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
 841        err = fsck_ident(&buffer, &commit->object, options);
 842        if (err)
 843                return err;
 844        if (!get_commit_tree(commit)) {
 845                err = report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", oid_to_hex(&tree_oid));
 846                if (err)
 847                        return err;
 848        }
 849        if (memchr(buffer_begin, '\0', size)) {
 850                err = report(options, &commit->object, FSCK_MSG_NUL_IN_COMMIT,
 851                             "NUL byte in the commit object body");
 852                if (err)
 853                        return err;
 854        }
 855        return 0;
 856}
 857
 858static int fsck_commit(struct commit *commit, const char *data,
 859        unsigned long size, struct fsck_options *options)
 860{
 861        const char *buffer = data ?  data : get_commit_buffer(commit, &size);
 862        int ret = fsck_commit_buffer(commit, buffer, size, options);
 863        if (!data)
 864                unuse_commit_buffer(commit, buffer);
 865        return ret;
 866}
 867
 868static int fsck_tag_buffer(struct tag *tag, const char *data,
 869        unsigned long size, struct fsck_options *options)
 870{
 871        struct object_id oid;
 872        int ret = 0;
 873        const char *buffer;
 874        char *to_free = NULL, *eol;
 875        struct strbuf sb = STRBUF_INIT;
 876        const char *p;
 877
 878        if (data)
 879                buffer = data;
 880        else {
 881                enum object_type type;
 882
 883                buffer = to_free =
 884                        read_object_file(&tag->object.oid, &type, &size);
 885                if (!buffer)
 886                        return report(options, &tag->object,
 887                                FSCK_MSG_MISSING_TAG_OBJECT,
 888                                "cannot read tag object");
 889
 890                if (type != OBJ_TAG) {
 891                        ret = report(options, &tag->object,
 892                                FSCK_MSG_TAG_OBJECT_NOT_TAG,
 893                                "expected tag got %s",
 894                            type_name(type));
 895                        goto done;
 896                }
 897        }
 898
 899        ret = verify_headers(buffer, size, &tag->object, options);
 900        if (ret)
 901                goto done;
 902
 903        if (!skip_prefix(buffer, "object ", &buffer)) {
 904                ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
 905                goto done;
 906        }
 907        if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
 908                ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
 909                if (ret)
 910                        goto done;
 911        }
 912        buffer = p + 1;
 913
 914        if (!skip_prefix(buffer, "type ", &buffer)) {
 915                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
 916                goto done;
 917        }
 918        eol = strchr(buffer, '\n');
 919        if (!eol) {
 920                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
 921                goto done;
 922        }
 923        if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
 924                ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
 925        if (ret)
 926                goto done;
 927        buffer = eol + 1;
 928
 929        if (!skip_prefix(buffer, "tag ", &buffer)) {
 930                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
 931                goto done;
 932        }
 933        eol = strchr(buffer, '\n');
 934        if (!eol) {
 935                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
 936                goto done;
 937        }
 938        strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
 939        if (check_refname_format(sb.buf, 0)) {
 940                ret = report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
 941                           "invalid 'tag' name: %.*s",
 942                           (int)(eol - buffer), buffer);
 943                if (ret)
 944                        goto done;
 945        }
 946        buffer = eol + 1;
 947
 948        if (!skip_prefix(buffer, "tagger ", &buffer)) {
 949                /* early tags do not contain 'tagger' lines; warn only */
 950                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
 951                if (ret)
 952                        goto done;
 953        }
 954        else
 955                ret = fsck_ident(&buffer, &tag->object, options);
 956
 957done:
 958        strbuf_release(&sb);
 959        free(to_free);
 960        return ret;
 961}
 962
 963static int fsck_tag(struct tag *tag, const char *data,
 964        unsigned long size, struct fsck_options *options)
 965{
 966        struct object *tagged = tag->tagged;
 967
 968        if (!tagged)
 969                return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
 970
 971        return fsck_tag_buffer(tag, data, size, options);
 972}
 973
 974struct fsck_gitmodules_data {
 975        struct object *obj;
 976        struct fsck_options *options;
 977        int ret;
 978};
 979
 980static int fsck_gitmodules_fn(const char *var, const char *value, void *vdata)
 981{
 982        struct fsck_gitmodules_data *data = vdata;
 983        const char *subsection, *key;
 984        int subsection_len;
 985        char *name;
 986
 987        if (parse_config_key(var, "submodule", &subsection, &subsection_len, &key) < 0 ||
 988            !subsection)
 989                return 0;
 990
 991        name = xmemdupz(subsection, subsection_len);
 992        if (check_submodule_name(name) < 0)
 993                data->ret |= report(data->options, data->obj,
 994                                    FSCK_MSG_GITMODULES_NAME,
 995                                    "disallowed submodule name: %s",
 996                                    name);
 997        if (!strcmp(key, "url") && value &&
 998            looks_like_command_line_option(value))
 999                data->ret |= report(data->options, data->obj,
1000                                    FSCK_MSG_GITMODULES_URL,
1001                                    "disallowed submodule url: %s",
1002                                    value);
1003        if (!strcmp(key, "path") && value &&
1004            looks_like_command_line_option(value))
1005                data->ret |= report(data->options, data->obj,
1006                                    FSCK_MSG_GITMODULES_PATH,
1007                                    "disallowed submodule path: %s",
1008                                    value);
1009        free(name);
1010
1011        return 0;
1012}
1013
1014static int fsck_blob(struct blob *blob, const char *buf,
1015                     unsigned long size, struct fsck_options *options)
1016{
1017        struct fsck_gitmodules_data data;
1018        struct config_options config_opts = { 0 };
1019
1020        if (!oidset_contains(&gitmodules_found, &blob->object.oid))
1021                return 0;
1022        oidset_insert(&gitmodules_done, &blob->object.oid);
1023
1024        if (object_on_skiplist(options, &blob->object))
1025                return 0;
1026
1027        if (!buf) {
1028                /*
1029                 * A missing buffer here is a sign that the caller found the
1030                 * blob too gigantic to load into memory. Let's just consider
1031                 * that an error.
1032                 */
1033                return report(options, &blob->object,
1034                              FSCK_MSG_GITMODULES_LARGE,
1035                              ".gitmodules too large to parse");
1036        }
1037
1038        data.obj = &blob->object;
1039        data.options = options;
1040        data.ret = 0;
1041        config_opts.error_action = CONFIG_ERROR_SILENT;
1042        if (git_config_from_mem(fsck_gitmodules_fn, CONFIG_ORIGIN_BLOB,
1043                                ".gitmodules", buf, size, &data, &config_opts))
1044                data.ret |= report(options, &blob->object,
1045                                   FSCK_MSG_GITMODULES_PARSE,
1046                                   "could not parse gitmodules blob");
1047
1048        return data.ret;
1049}
1050
1051int fsck_object(struct object *obj, void *data, unsigned long size,
1052        struct fsck_options *options)
1053{
1054        if (!obj)
1055                return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
1056
1057        if (obj->type == OBJ_BLOB)
1058                return fsck_blob((struct blob *)obj, data, size, options);
1059        if (obj->type == OBJ_TREE)
1060                return fsck_tree((struct tree *) obj, options);
1061        if (obj->type == OBJ_COMMIT)
1062                return fsck_commit((struct commit *) obj, (const char *) data,
1063                        size, options);
1064        if (obj->type == OBJ_TAG)
1065                return fsck_tag((struct tag *) obj, (const char *) data,
1066                        size, options);
1067
1068        return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
1069                          obj->type);
1070}
1071
1072int fsck_error_function(struct fsck_options *o,
1073        struct object *obj, int msg_type, const char *message)
1074{
1075        if (msg_type == FSCK_WARN) {
1076                warning("object %s: %s", describe_object(o, obj), message);
1077                return 0;
1078        }
1079        error("object %s: %s", describe_object(o, obj), message);
1080        return 1;
1081}
1082
1083int fsck_finish(struct fsck_options *options)
1084{
1085        int ret = 0;
1086        struct oidset_iter iter;
1087        const struct object_id *oid;
1088
1089        oidset_iter_init(&gitmodules_found, &iter);
1090        while ((oid = oidset_iter_next(&iter))) {
1091                struct blob *blob;
1092                enum object_type type;
1093                unsigned long size;
1094                char *buf;
1095
1096                if (oidset_contains(&gitmodules_done, oid))
1097                        continue;
1098
1099                blob = lookup_blob(the_repository, oid);
1100                if (!blob) {
1101                        struct object *obj = lookup_unknown_object(oid->hash);
1102                        ret |= report(options, obj,
1103                                      FSCK_MSG_GITMODULES_BLOB,
1104                                      "non-blob found at .gitmodules");
1105                        continue;
1106                }
1107
1108                buf = read_object_file(oid, &type, &size);
1109                if (!buf) {
1110                        if (is_promisor_object(&blob->object.oid))
1111                                continue;
1112                        ret |= report(options, &blob->object,
1113                                      FSCK_MSG_GITMODULES_MISSING,
1114                                      "unable to read .gitmodules blob");
1115                        continue;
1116                }
1117
1118                if (type == OBJ_BLOB)
1119                        ret |= fsck_blob(blob, buf, size, options);
1120                else
1121                        ret |= report(options, &blob->object,
1122                                      FSCK_MSG_GITMODULES_BLOB,
1123                                      "non-blob found at .gitmodules");
1124                free(buf);
1125        }
1126
1127
1128        oidset_clear(&gitmodules_found);
1129        oidset_clear(&gitmodules_done);
1130        return ret;
1131}