Andrew's git / gitweb.git / fsck.c
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fsck.con commit Merge branch 'sg/ci-brew-gcc-workaround' (e1cee0b)
   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
  20static struct oidset gitmodules_found = OIDSET_INIT;
  21static 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_GRAFT, ERROR) \
  47        FUNC(MISSING_NAME_BEFORE_EMAIL, ERROR) \
  48        FUNC(MISSING_OBJECT, ERROR) \
  49        FUNC(MISSING_PARENT, ERROR) \
  50        FUNC(MISSING_SPACE_BEFORE_DATE, ERROR) \
  51        FUNC(MISSING_SPACE_BEFORE_EMAIL, ERROR) \
  52        FUNC(MISSING_TAG, ERROR) \
  53        FUNC(MISSING_TAG_ENTRY, ERROR) \
  54        FUNC(MISSING_TAG_OBJECT, ERROR) \
  55        FUNC(MISSING_TREE, ERROR) \
  56        FUNC(MISSING_TREE_OBJECT, ERROR) \
  57        FUNC(MISSING_TYPE, ERROR) \
  58        FUNC(MISSING_TYPE_ENTRY, ERROR) \
  59        FUNC(MULTIPLE_AUTHORS, ERROR) \
  60        FUNC(TAG_OBJECT_NOT_TAG, ERROR) \
  61        FUNC(TREE_NOT_SORTED, ERROR) \
  62        FUNC(UNKNOWN_TYPE, ERROR) \
  63        FUNC(ZERO_PADDED_DATE, ERROR) \
  64        FUNC(GITMODULES_MISSING, ERROR) \
  65        FUNC(GITMODULES_BLOB, ERROR) \
  66        FUNC(GITMODULES_LARGE, ERROR) \
  67        FUNC(GITMODULES_NAME, ERROR) \
  68        FUNC(GITMODULES_SYMLINK, ERROR) \
  69        FUNC(GITMODULES_URL, ERROR) \
  70        FUNC(GITMODULES_PATH, ERROR) \
  71        /* warnings */ \
  72        FUNC(BAD_FILEMODE, WARN) \
  73        FUNC(EMPTY_NAME, WARN) \
  74        FUNC(FULL_PATHNAME, WARN) \
  75        FUNC(HAS_DOT, WARN) \
  76        FUNC(HAS_DOTDOT, WARN) \
  77        FUNC(HAS_DOTGIT, WARN) \
  78        FUNC(NULL_SHA1, WARN) \
  79        FUNC(ZERO_PADDED_FILEMODE, WARN) \
  80        FUNC(NUL_IN_COMMIT, WARN) \
  81        /* infos (reported as warnings, but ignored by default) */ \
  82        FUNC(GITMODULES_PARSE, INFO) \
  83        FUNC(BAD_TAG_NAME, INFO) \
  84        FUNC(MISSING_TAGGER_ENTRY, INFO)
  85
  86#define MSG_ID(id, msg_type) FSCK_MSG_##id,
  87enum fsck_msg_id {
  88        FOREACH_MSG_ID(MSG_ID)
  89        FSCK_MSG_MAX
  90};
  91#undef MSG_ID
  92
  93#define STR(x) #x
  94#define MSG_ID(id, msg_type) { STR(id), NULL, NULL, FSCK_##msg_type },
  95static struct {
  96        const char *id_string;
  97        const char *downcased;
  98        const char *camelcased;
  99        int msg_type;
 100} msg_id_info[FSCK_MSG_MAX + 1] = {
 101        FOREACH_MSG_ID(MSG_ID)
 102        { NULL, NULL, NULL, -1 }
 103};
 104#undef MSG_ID
 105
 106static void prepare_msg_ids(void)
 107{
 108        int i;
 109
 110        if (msg_id_info[0].downcased)
 111                return;
 112
 113        /* convert id_string to lower case, without underscores. */
 114        for (i = 0; i < FSCK_MSG_MAX; i++) {
 115                const char *p = msg_id_info[i].id_string;
 116                int len = strlen(p);
 117                char *q = xmalloc(len);
 118
 119                msg_id_info[i].downcased = q;
 120                while (*p)
 121                        if (*p == '_')
 122                                p++;
 123                        else
 124                                *(q)++ = tolower(*(p)++);
 125                *q = '\0';
 126
 127                p = msg_id_info[i].id_string;
 128                q = xmalloc(len);
 129                msg_id_info[i].camelcased = q;
 130                while (*p) {
 131                        if (*p == '_') {
 132                                p++;
 133                                if (*p)
 134                                        *q++ = *p++;
 135                        } else {
 136                                *q++ = tolower(*p++);
 137                        }
 138                }
 139                *q = '\0';
 140        }
 141}
 142
 143static int parse_msg_id(const char *text)
 144{
 145        int i;
 146
 147        prepare_msg_ids();
 148
 149        for (i = 0; i < FSCK_MSG_MAX; i++)
 150                if (!strcmp(text, msg_id_info[i].downcased))
 151                        return i;
 152
 153        return -1;
 154}
 155
 156void list_config_fsck_msg_ids(struct string_list *list, const char *prefix)
 157{
 158        int i;
 159
 160        prepare_msg_ids();
 161
 162        for (i = 0; i < FSCK_MSG_MAX; i++)
 163                list_config_item(list, prefix, msg_id_info[i].camelcased);
 164}
 165
 166static int fsck_msg_type(enum fsck_msg_id msg_id,
 167        struct fsck_options *options)
 168{
 169        int msg_type;
 170
 171        assert(msg_id >= 0 && msg_id < FSCK_MSG_MAX);
 172
 173        if (options->msg_type)
 174                msg_type = options->msg_type[msg_id];
 175        else {
 176                msg_type = msg_id_info[msg_id].msg_type;
 177                if (options->strict && msg_type == FSCK_WARN)
 178                        msg_type = FSCK_ERROR;
 179        }
 180
 181        return msg_type;
 182}
 183
 184static void init_skiplist(struct fsck_options *options, const char *path)
 185{
 186        FILE *fp;
 187        struct strbuf sb = STRBUF_INIT;
 188        struct object_id oid;
 189
 190        fp = fopen(path, "r");
 191        if (!fp)
 192                die("Could not open skip list: %s", path);
 193        while (!strbuf_getline(&sb, fp)) {
 194                const char *p;
 195                const char *hash;
 196
 197                /*
 198                 * Allow trailing comments, leading whitespace
 199                 * (including before commits), and empty or whitespace
 200                 * only lines.
 201                 */
 202                hash = strchr(sb.buf, '#');
 203                if (hash)
 204                        strbuf_setlen(&sb, hash - sb.buf);
 205                strbuf_trim(&sb);
 206                if (!sb.len)
 207                        continue;
 208
 209                if (parse_oid_hex(sb.buf, &oid, &p) || *p != '\0')
 210                        die("Invalid SHA-1: %s", sb.buf);
 211                oidset_insert(&options->skiplist, &oid);
 212        }
 213        if (ferror(fp))
 214                die_errno("Could not read '%s'", path);
 215        fclose(fp);
 216        strbuf_release(&sb);
 217}
 218
 219static int parse_msg_type(const char *str)
 220{
 221        if (!strcmp(str, "error"))
 222                return FSCK_ERROR;
 223        else if (!strcmp(str, "warn"))
 224                return FSCK_WARN;
 225        else if (!strcmp(str, "ignore"))
 226                return FSCK_IGNORE;
 227        else
 228                die("Unknown fsck message type: '%s'", str);
 229}
 230
 231int is_valid_msg_type(const char *msg_id, const char *msg_type)
 232{
 233        if (parse_msg_id(msg_id) < 0)
 234                return 0;
 235        parse_msg_type(msg_type);
 236        return 1;
 237}
 238
 239void fsck_set_msg_type(struct fsck_options *options,
 240                const char *msg_id, const char *msg_type)
 241{
 242        int id = parse_msg_id(msg_id), type;
 243
 244        if (id < 0)
 245                die("Unhandled message id: %s", msg_id);
 246        type = parse_msg_type(msg_type);
 247
 248        if (type != FSCK_ERROR && msg_id_info[id].msg_type == FSCK_FATAL)
 249                die("Cannot demote %s to %s", msg_id, msg_type);
 250
 251        if (!options->msg_type) {
 252                int i;
 253                int *msg_type;
 254                ALLOC_ARRAY(msg_type, FSCK_MSG_MAX);
 255                for (i = 0; i < FSCK_MSG_MAX; i++)
 256                        msg_type[i] = fsck_msg_type(i, options);
 257                options->msg_type = msg_type;
 258        }
 259
 260        options->msg_type[id] = type;
 261}
 262
 263void fsck_set_msg_types(struct fsck_options *options, const char *values)
 264{
 265        char *buf = xstrdup(values), *to_free = buf;
 266        int done = 0;
 267
 268        while (!done) {
 269                int len = strcspn(buf, " ,|"), equal;
 270
 271                done = !buf[len];
 272                if (!len) {
 273                        buf++;
 274                        continue;
 275                }
 276                buf[len] = '\0';
 277
 278                for (equal = 0;
 279                     equal < len && buf[equal] != '=' && buf[equal] != ':';
 280                     equal++)
 281                        buf[equal] = tolower(buf[equal]);
 282                buf[equal] = '\0';
 283
 284                if (!strcmp(buf, "skiplist")) {
 285                        if (equal == len)
 286                                die("skiplist requires a path");
 287                        init_skiplist(options, buf + equal + 1);
 288                        buf += len + 1;
 289                        continue;
 290                }
 291
 292                if (equal == len)
 293                        die("Missing '=': '%s'", buf);
 294
 295                fsck_set_msg_type(options, buf, buf + equal + 1);
 296                buf += len + 1;
 297        }
 298        free(to_free);
 299}
 300
 301static void append_msg_id(struct strbuf *sb, const char *msg_id)
 302{
 303        for (;;) {
 304                char c = *(msg_id)++;
 305
 306                if (!c)
 307                        break;
 308                if (c != '_')
 309                        strbuf_addch(sb, tolower(c));
 310                else {
 311                        assert(*msg_id);
 312                        strbuf_addch(sb, *(msg_id)++);
 313                }
 314        }
 315
 316        strbuf_addstr(sb, ": ");
 317}
 318
 319static int object_on_skiplist(struct fsck_options *opts, struct object *obj)
 320{
 321        return opts && obj && oidset_contains(&opts->skiplist, &obj->oid);
 322}
 323
 324__attribute__((format (printf, 4, 5)))
 325static int report(struct fsck_options *options, struct object *object,
 326        enum fsck_msg_id id, const char *fmt, ...)
 327{
 328        va_list ap;
 329        struct strbuf sb = STRBUF_INIT;
 330        int msg_type = fsck_msg_type(id, options), result;
 331
 332        if (msg_type == FSCK_IGNORE)
 333                return 0;
 334
 335        if (object_on_skiplist(options, object))
 336                return 0;
 337
 338        if (msg_type == FSCK_FATAL)
 339                msg_type = FSCK_ERROR;
 340        else if (msg_type == FSCK_INFO)
 341                msg_type = FSCK_WARN;
 342
 343        append_msg_id(&sb, msg_id_info[id].id_string);
 344
 345        va_start(ap, fmt);
 346        strbuf_vaddf(&sb, fmt, ap);
 347        result = options->error_func(options, object, msg_type, sb.buf);
 348        strbuf_release(&sb);
 349        va_end(ap);
 350
 351        return result;
 352}
 353
 354static char *get_object_name(struct fsck_options *options, struct object *obj)
 355{
 356        if (!options->object_names)
 357                return NULL;
 358        return lookup_decoration(options->object_names, obj);
 359}
 360
 361static void put_object_name(struct fsck_options *options, struct object *obj,
 362        const char *fmt, ...)
 363{
 364        va_list ap;
 365        struct strbuf buf = STRBUF_INIT;
 366        char *existing;
 367
 368        if (!options->object_names)
 369                return;
 370        existing = lookup_decoration(options->object_names, obj);
 371        if (existing)
 372                return;
 373        va_start(ap, fmt);
 374        strbuf_vaddf(&buf, fmt, ap);
 375        add_decoration(options->object_names, obj, strbuf_detach(&buf, NULL));
 376        va_end(ap);
 377}
 378
 379static const char *describe_object(struct fsck_options *o, struct object *obj)
 380{
 381        static struct strbuf buf = STRBUF_INIT;
 382        char *name;
 383
 384        strbuf_reset(&buf);
 385        strbuf_addstr(&buf, oid_to_hex(&obj->oid));
 386        if (o->object_names && (name = lookup_decoration(o->object_names, obj)))
 387                strbuf_addf(&buf, " (%s)", name);
 388
 389        return buf.buf;
 390}
 391
 392static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
 393{
 394        struct tree_desc desc;
 395        struct name_entry entry;
 396        int res = 0;
 397        const char *name;
 398
 399        if (parse_tree(tree))
 400                return -1;
 401
 402        name = get_object_name(options, &tree->object);
 403        if (init_tree_desc_gently(&desc, tree->buffer, tree->size))
 404                return -1;
 405        while (tree_entry_gently(&desc, &entry)) {
 406                struct object *obj;
 407                int result;
 408
 409                if (S_ISGITLINK(entry.mode))
 410                        continue;
 411
 412                if (S_ISDIR(entry.mode)) {
 413                        obj = (struct object *)lookup_tree(the_repository, &entry.oid);
 414                        if (name && obj)
 415                                put_object_name(options, obj, "%s%s/", name,
 416                                        entry.path);
 417                        result = options->walk(obj, OBJ_TREE, data, options);
 418                }
 419                else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
 420                        obj = (struct object *)lookup_blob(the_repository, &entry.oid);
 421                        if (name && obj)
 422                                put_object_name(options, obj, "%s%s", name,
 423                                        entry.path);
 424                        result = options->walk(obj, OBJ_BLOB, data, options);
 425                }
 426                else {
 427                        result = error("in tree %s: entry %s has bad mode %.6o",
 428                                        describe_object(options, &tree->object), entry.path, entry.mode);
 429                }
 430                if (result < 0)
 431                        return result;
 432                if (!res)
 433                        res = result;
 434        }
 435        return res;
 436}
 437
 438static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
 439{
 440        int counter = 0, generation = 0, name_prefix_len = 0;
 441        struct commit_list *parents;
 442        int res;
 443        int result;
 444        const char *name;
 445
 446        if (parse_commit(commit))
 447                return -1;
 448
 449        name = get_object_name(options, &commit->object);
 450        if (name)
 451                put_object_name(options, &get_commit_tree(commit)->object,
 452                                "%s:", name);
 453
 454        result = options->walk((struct object *)get_commit_tree(commit),
 455                               OBJ_TREE, data, options);
 456        if (result < 0)
 457                return result;
 458        res = result;
 459
 460        parents = commit->parents;
 461        if (name && parents) {
 462                int len = strlen(name), power;
 463
 464                if (len && name[len - 1] == '^') {
 465                        generation = 1;
 466                        name_prefix_len = len - 1;
 467                }
 468                else { /* parse ~<generation> suffix */
 469                        for (generation = 0, power = 1;
 470                             len && isdigit(name[len - 1]);
 471                             power *= 10)
 472                                generation += power * (name[--len] - '0');
 473                        if (power > 1 && len && name[len - 1] == '~')
 474                                name_prefix_len = len - 1;
 475                }
 476        }
 477
 478        while (parents) {
 479                if (name) {
 480                        struct object *obj = &parents->item->object;
 481
 482                        if (counter++)
 483                                put_object_name(options, obj, "%s^%d",
 484                                        name, counter);
 485                        else if (generation > 0)
 486                                put_object_name(options, obj, "%.*s~%d",
 487                                        name_prefix_len, name, generation + 1);
 488                        else
 489                                put_object_name(options, obj, "%s^", name);
 490                }
 491                result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
 492                if (result < 0)
 493                        return result;
 494                if (!res)
 495                        res = result;
 496                parents = parents->next;
 497        }
 498        return res;
 499}
 500
 501static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
 502{
 503        char *name = get_object_name(options, &tag->object);
 504
 505        if (parse_tag(tag))
 506                return -1;
 507        if (name)
 508                put_object_name(options, tag->tagged, "%s", name);
 509        return options->walk(tag->tagged, OBJ_ANY, data, options);
 510}
 511
 512int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
 513{
 514        if (!obj)
 515                return -1;
 516
 517        if (obj->type == OBJ_NONE)
 518                parse_object(the_repository, &obj->oid);
 519
 520        switch (obj->type) {
 521        case OBJ_BLOB:
 522                return 0;
 523        case OBJ_TREE:
 524                return fsck_walk_tree((struct tree *)obj, data, options);
 525        case OBJ_COMMIT:
 526                return fsck_walk_commit((struct commit *)obj, data, options);
 527        case OBJ_TAG:
 528                return fsck_walk_tag((struct tag *)obj, data, options);
 529        default:
 530                error("Unknown object type for %s", describe_object(options, obj));
 531                return -1;
 532        }
 533}
 534
 535/*
 536 * The entries in a tree are ordered in the _path_ order,
 537 * which means that a directory entry is ordered by adding
 538 * a slash to the end of it.
 539 *
 540 * So a directory called "a" is ordered _after_ a file
 541 * called "a.c", because "a/" sorts after "a.c".
 542 */
 543#define TREE_UNORDERED (-1)
 544#define TREE_HAS_DUPS  (-2)
 545
 546static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
 547{
 548        int len1 = strlen(name1);
 549        int len2 = strlen(name2);
 550        int len = len1 < len2 ? len1 : len2;
 551        unsigned char c1, c2;
 552        int cmp;
 553
 554        cmp = memcmp(name1, name2, len);
 555        if (cmp < 0)
 556                return 0;
 557        if (cmp > 0)
 558                return TREE_UNORDERED;
 559
 560        /*
 561         * Ok, the first <len> characters are the same.
 562         * Now we need to order the next one, but turn
 563         * a '\0' into a '/' for a directory entry.
 564         */
 565        c1 = name1[len];
 566        c2 = name2[len];
 567        if (!c1 && !c2)
 568                /*
 569                 * git-write-tree used to write out a nonsense tree that has
 570                 * entries with the same name, one blob and one tree.  Make
 571                 * sure we do not have duplicate entries.
 572                 */
 573                return TREE_HAS_DUPS;
 574        if (!c1 && S_ISDIR(mode1))
 575                c1 = '/';
 576        if (!c2 && S_ISDIR(mode2))
 577                c2 = '/';
 578        return c1 < c2 ? 0 : TREE_UNORDERED;
 579}
 580
 581static int fsck_tree(struct tree *item, struct fsck_options *options)
 582{
 583        int retval = 0;
 584        int has_null_sha1 = 0;
 585        int has_full_path = 0;
 586        int has_empty_name = 0;
 587        int has_dot = 0;
 588        int has_dotdot = 0;
 589        int has_dotgit = 0;
 590        int has_zero_pad = 0;
 591        int has_bad_modes = 0;
 592        int has_dup_entries = 0;
 593        int not_properly_sorted = 0;
 594        struct tree_desc desc;
 595        unsigned o_mode;
 596        const char *o_name;
 597
 598        if (init_tree_desc_gently(&desc, item->buffer, item->size)) {
 599                retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 600                return retval;
 601        }
 602
 603        o_mode = 0;
 604        o_name = NULL;
 605
 606        while (desc.size) {
 607                unsigned short mode;
 608                const char *name;
 609                const struct object_id *oid;
 610
 611                oid = tree_entry_extract(&desc, &name, &mode);
 612
 613                has_null_sha1 |= is_null_oid(oid);
 614                has_full_path |= !!strchr(name, '/');
 615                has_empty_name |= !*name;
 616                has_dot |= !strcmp(name, ".");
 617                has_dotdot |= !strcmp(name, "..");
 618                has_dotgit |= is_hfs_dotgit(name) || is_ntfs_dotgit(name);
 619                has_zero_pad |= *(char *)desc.buffer == '0';
 620
 621                if (is_hfs_dotgitmodules(name) || is_ntfs_dotgitmodules(name)) {
 622                        if (!S_ISLNK(mode))
 623                                oidset_insert(&gitmodules_found, oid);
 624                        else
 625                                retval += report(options, &item->object,
 626                                                 FSCK_MSG_GITMODULES_SYMLINK,
 627                                                 ".gitmodules is a symbolic link");
 628                }
 629
 630                if (update_tree_entry_gently(&desc)) {
 631                        retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 632                        break;
 633                }
 634
 635                switch (mode) {
 636                /*
 637                 * Standard modes..
 638                 */
 639                case S_IFREG | 0755:
 640                case S_IFREG | 0644:
 641                case S_IFLNK:
 642                case S_IFDIR:
 643                case S_IFGITLINK:
 644                        break;
 645                /*
 646                 * This is nonstandard, but we had a few of these
 647                 * early on when we honored the full set of mode
 648                 * bits..
 649                 */
 650                case S_IFREG | 0664:
 651                        if (!options->strict)
 652                                break;
 653                        /* fallthrough */
 654                default:
 655                        has_bad_modes = 1;
 656                }
 657
 658                if (o_name) {
 659                        switch (verify_ordered(o_mode, o_name, mode, name)) {
 660                        case TREE_UNORDERED:
 661                                not_properly_sorted = 1;
 662                                break;
 663                        case TREE_HAS_DUPS:
 664                                has_dup_entries = 1;
 665                                break;
 666                        default:
 667                                break;
 668                        }
 669                }
 670
 671                o_mode = mode;
 672                o_name = name;
 673        }
 674
 675        if (has_null_sha1)
 676                retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
 677        if (has_full_path)
 678                retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
 679        if (has_empty_name)
 680                retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
 681        if (has_dot)
 682                retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
 683        if (has_dotdot)
 684                retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
 685        if (has_dotgit)
 686                retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
 687        if (has_zero_pad)
 688                retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
 689        if (has_bad_modes)
 690                retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
 691        if (has_dup_entries)
 692                retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
 693        if (not_properly_sorted)
 694                retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
 695        return retval;
 696}
 697
 698static int verify_headers(const void *data, unsigned long size,
 699                          struct object *obj, struct fsck_options *options)
 700{
 701        const char *buffer = (const char *)data;
 702        unsigned long i;
 703
 704        for (i = 0; i < size; i++) {
 705                switch (buffer[i]) {
 706                case '\0':
 707                        return report(options, obj,
 708                                FSCK_MSG_NUL_IN_HEADER,
 709                                "unterminated header: NUL at offset %ld", i);
 710                case '\n':
 711                        if (i + 1 < size && buffer[i + 1] == '\n')
 712                                return 0;
 713                }
 714        }
 715
 716        /*
 717         * We did not find double-LF that separates the header
 718         * and the body.  Not having a body is not a crime but
 719         * we do want to see the terminating LF for the last header
 720         * line.
 721         */
 722        if (size && buffer[size - 1] == '\n')
 723                return 0;
 724
 725        return report(options, obj,
 726                FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
 727}
 728
 729static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
 730{
 731        const char *p = *ident;
 732        char *end;
 733
 734        *ident = strchrnul(*ident, '\n');
 735        if (**ident == '\n')
 736                (*ident)++;
 737
 738        if (*p == '<')
 739                return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 740        p += strcspn(p, "<>\n");
 741        if (*p == '>')
 742                return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
 743        if (*p != '<')
 744                return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
 745        if (p[-1] != ' ')
 746                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 747        p++;
 748        p += strcspn(p, "<>\n");
 749        if (*p != '>')
 750                return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
 751        p++;
 752        if (*p != ' ')
 753                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
 754        p++;
 755        if (*p == '0' && p[1] != ' ')
 756                return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
 757        if (date_overflows(parse_timestamp(p, &end, 10)))
 758                return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
 759        if ((end == p || *end != ' '))
 760                return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
 761        p = end + 1;
 762        if ((*p != '+' && *p != '-') ||
 763            !isdigit(p[1]) ||
 764            !isdigit(p[2]) ||
 765            !isdigit(p[3]) ||
 766            !isdigit(p[4]) ||
 767            (p[5] != '\n'))
 768                return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
 769        p += 6;
 770        return 0;
 771}
 772
 773static int fsck_commit_buffer(struct commit *commit, const char *buffer,
 774        unsigned long size, struct fsck_options *options)
 775{
 776        struct object_id tree_oid, oid;
 777        struct commit_graft *graft;
 778        unsigned parent_count, parent_line_count = 0, author_count;
 779        int err;
 780        const char *buffer_begin = buffer;
 781        const char *p;
 782
 783        if (verify_headers(buffer, size, &commit->object, options))
 784                return -1;
 785
 786        if (!skip_prefix(buffer, "tree ", &buffer))
 787                return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
 788        if (parse_oid_hex(buffer, &tree_oid, &p) || *p != '\n') {
 789                err = report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
 790                if (err)
 791                        return err;
 792        }
 793        buffer = p + 1;
 794        while (skip_prefix(buffer, "parent ", &buffer)) {
 795                if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
 796                        err = report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
 797                        if (err)
 798                                return err;
 799                }
 800                buffer = p + 1;
 801                parent_line_count++;
 802        }
 803        graft = lookup_commit_graft(the_repository, &commit->object.oid);
 804        parent_count = commit_list_count(commit->parents);
 805        if (graft) {
 806                if (graft->nr_parent == -1 && !parent_count)
 807                        ; /* shallow commit */
 808                else if (graft->nr_parent != parent_count) {
 809                        err = report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
 810                        if (err)
 811                                return err;
 812                }
 813        } else {
 814                if (parent_count != parent_line_count) {
 815                        err = report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
 816                        if (err)
 817                                return err;
 818                }
 819        }
 820        author_count = 0;
 821        while (skip_prefix(buffer, "author ", &buffer)) {
 822                author_count++;
 823                err = fsck_ident(&buffer, &commit->object, options);
 824                if (err)
 825                        return err;
 826        }
 827        if (author_count < 1)
 828                err = report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
 829        else if (author_count > 1)
 830                err = report(options, &commit->object, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
 831        if (err)
 832                return err;
 833        if (!skip_prefix(buffer, "committer ", &buffer))
 834                return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
 835        err = fsck_ident(&buffer, &commit->object, options);
 836        if (err)
 837                return err;
 838        if (!get_commit_tree(commit)) {
 839                err = report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", oid_to_hex(&tree_oid));
 840                if (err)
 841                        return err;
 842        }
 843        if (memchr(buffer_begin, '\0', size)) {
 844                err = report(options, &commit->object, FSCK_MSG_NUL_IN_COMMIT,
 845                             "NUL byte in the commit object body");
 846                if (err)
 847                        return err;
 848        }
 849        return 0;
 850}
 851
 852static int fsck_commit(struct commit *commit, const char *data,
 853        unsigned long size, struct fsck_options *options)
 854{
 855        const char *buffer = data ?  data : get_commit_buffer(commit, &size);
 856        int ret = fsck_commit_buffer(commit, buffer, size, options);
 857        if (!data)
 858                unuse_commit_buffer(commit, buffer);
 859        return ret;
 860}
 861
 862static int fsck_tag_buffer(struct tag *tag, const char *data,
 863        unsigned long size, struct fsck_options *options)
 864{
 865        struct object_id oid;
 866        int ret = 0;
 867        const char *buffer;
 868        char *to_free = NULL, *eol;
 869        struct strbuf sb = STRBUF_INIT;
 870        const char *p;
 871
 872        if (data)
 873                buffer = data;
 874        else {
 875                enum object_type type;
 876
 877                buffer = to_free =
 878                        read_object_file(&tag->object.oid, &type, &size);
 879                if (!buffer)
 880                        return report(options, &tag->object,
 881                                FSCK_MSG_MISSING_TAG_OBJECT,
 882                                "cannot read tag object");
 883
 884                if (type != OBJ_TAG) {
 885                        ret = report(options, &tag->object,
 886                                FSCK_MSG_TAG_OBJECT_NOT_TAG,
 887                                "expected tag got %s",
 888                            type_name(type));
 889                        goto done;
 890                }
 891        }
 892
 893        ret = verify_headers(buffer, size, &tag->object, options);
 894        if (ret)
 895                goto done;
 896
 897        if (!skip_prefix(buffer, "object ", &buffer)) {
 898                ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
 899                goto done;
 900        }
 901        if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
 902                ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
 903                if (ret)
 904                        goto done;
 905        }
 906        buffer = p + 1;
 907
 908        if (!skip_prefix(buffer, "type ", &buffer)) {
 909                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
 910                goto done;
 911        }
 912        eol = strchr(buffer, '\n');
 913        if (!eol) {
 914                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
 915                goto done;
 916        }
 917        if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
 918                ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
 919        if (ret)
 920                goto done;
 921        buffer = eol + 1;
 922
 923        if (!skip_prefix(buffer, "tag ", &buffer)) {
 924                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
 925                goto done;
 926        }
 927        eol = strchr(buffer, '\n');
 928        if (!eol) {
 929                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
 930                goto done;
 931        }
 932        strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
 933        if (check_refname_format(sb.buf, 0)) {
 934                ret = report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
 935                           "invalid 'tag' name: %.*s",
 936                           (int)(eol - buffer), buffer);
 937                if (ret)
 938                        goto done;
 939        }
 940        buffer = eol + 1;
 941
 942        if (!skip_prefix(buffer, "tagger ", &buffer)) {
 943                /* early tags do not contain 'tagger' lines; warn only */
 944                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
 945                if (ret)
 946                        goto done;
 947        }
 948        else
 949                ret = fsck_ident(&buffer, &tag->object, options);
 950
 951done:
 952        strbuf_release(&sb);
 953        free(to_free);
 954        return ret;
 955}
 956
 957static int fsck_tag(struct tag *tag, const char *data,
 958        unsigned long size, struct fsck_options *options)
 959{
 960        struct object *tagged = tag->tagged;
 961
 962        if (!tagged)
 963                return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
 964
 965        return fsck_tag_buffer(tag, data, size, options);
 966}
 967
 968struct fsck_gitmodules_data {
 969        struct object *obj;
 970        struct fsck_options *options;
 971        int ret;
 972};
 973
 974static int fsck_gitmodules_fn(const char *var, const char *value, void *vdata)
 975{
 976        struct fsck_gitmodules_data *data = vdata;
 977        const char *subsection, *key;
 978        int subsection_len;
 979        char *name;
 980
 981        if (parse_config_key(var, "submodule", &subsection, &subsection_len, &key) < 0 ||
 982            !subsection)
 983                return 0;
 984
 985        name = xmemdupz(subsection, subsection_len);
 986        if (check_submodule_name(name) < 0)
 987                data->ret |= report(data->options, data->obj,
 988                                    FSCK_MSG_GITMODULES_NAME,
 989                                    "disallowed submodule name: %s",
 990                                    name);
 991        if (!strcmp(key, "url") && value &&
 992            looks_like_command_line_option(value))
 993                data->ret |= report(data->options, data->obj,
 994                                    FSCK_MSG_GITMODULES_URL,
 995                                    "disallowed submodule url: %s",
 996                                    value);
 997        if (!strcmp(key, "path") && value &&
 998            looks_like_command_line_option(value))
 999                data->ret |= report(data->options, data->obj,
1000                                    FSCK_MSG_GITMODULES_PATH,
1001                                    "disallowed submodule path: %s",
1002                                    value);
1003        free(name);
1004
1005        return 0;
1006}
1007
1008static int fsck_blob(struct blob *blob, const char *buf,
1009                     unsigned long size, struct fsck_options *options)
1010{
1011        struct fsck_gitmodules_data data;
1012        struct config_options config_opts = { 0 };
1013
1014        if (!oidset_contains(&gitmodules_found, &blob->object.oid))
1015                return 0;
1016        oidset_insert(&gitmodules_done, &blob->object.oid);
1017
1018        if (object_on_skiplist(options, &blob->object))
1019                return 0;
1020
1021        if (!buf) {
1022                /*
1023                 * A missing buffer here is a sign that the caller found the
1024                 * blob too gigantic to load into memory. Let's just consider
1025                 * that an error.
1026                 */
1027                return report(options, &blob->object,
1028                              FSCK_MSG_GITMODULES_LARGE,
1029                              ".gitmodules too large to parse");
1030        }
1031
1032        data.obj = &blob->object;
1033        data.options = options;
1034        data.ret = 0;
1035        config_opts.error_action = CONFIG_ERROR_SILENT;
1036        if (git_config_from_mem(fsck_gitmodules_fn, CONFIG_ORIGIN_BLOB,
1037                                ".gitmodules", buf, size, &data, &config_opts))
1038                data.ret |= report(options, &blob->object,
1039                                   FSCK_MSG_GITMODULES_PARSE,
1040                                   "could not parse gitmodules blob");
1041
1042        return data.ret;
1043}
1044
1045int fsck_object(struct object *obj, void *data, unsigned long size,
1046        struct fsck_options *options)
1047{
1048        if (!obj)
1049                return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
1050
1051        if (obj->type == OBJ_BLOB)
1052                return fsck_blob((struct blob *)obj, data, size, options);
1053        if (obj->type == OBJ_TREE)
1054                return fsck_tree((struct tree *) obj, options);
1055        if (obj->type == OBJ_COMMIT)
1056                return fsck_commit((struct commit *) obj, (const char *) data,
1057                        size, options);
1058        if (obj->type == OBJ_TAG)
1059                return fsck_tag((struct tag *) obj, (const char *) data,
1060                        size, options);
1061
1062        return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
1063                          obj->type);
1064}
1065
1066int fsck_error_function(struct fsck_options *o,
1067        struct object *obj, int msg_type, const char *message)
1068{
1069        if (msg_type == FSCK_WARN) {
1070                warning("object %s: %s", describe_object(o, obj), message);
1071                return 0;
1072        }
1073        error("object %s: %s", describe_object(o, obj), message);
1074        return 1;
1075}
1076
1077int fsck_finish(struct fsck_options *options)
1078{
1079        int ret = 0;
1080        struct oidset_iter iter;
1081        const struct object_id *oid;
1082
1083        oidset_iter_init(&gitmodules_found, &iter);
1084        while ((oid = oidset_iter_next(&iter))) {
1085                struct blob *blob;
1086                enum object_type type;
1087                unsigned long size;
1088                char *buf;
1089
1090                if (oidset_contains(&gitmodules_done, oid))
1091                        continue;
1092
1093                blob = lookup_blob(the_repository, oid);
1094                if (!blob) {
1095                        struct object *obj = lookup_unknown_object(oid);
1096                        ret |= report(options, obj,
1097                                      FSCK_MSG_GITMODULES_BLOB,
1098                                      "non-blob found at .gitmodules");
1099                        continue;
1100                }
1101
1102                buf = read_object_file(oid, &type, &size);
1103                if (!buf) {
1104                        if (is_promisor_object(&blob->object.oid))
1105                                continue;
1106                        ret |= report(options, &blob->object,
1107                                      FSCK_MSG_GITMODULES_MISSING,
1108                                      "unable to read .gitmodules blob");
1109                        continue;
1110                }
1111
1112                if (type == OBJ_BLOB)
1113                        ret |= fsck_blob(blob, buf, size, options);
1114                else
1115                        ret |= report(options, &blob->object,
1116                                      FSCK_MSG_GITMODULES_BLOB,
1117                                      "non-blob found at .gitmodules");
1118                free(buf);
1119        }
1120
1121
1122        oidset_clear(&gitmodules_found);
1123        oidset_clear(&gitmodules_done);
1124        return ret;
1125}