Andrew's git / gitweb.git / fsck.c
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fsck.con commit Merge branch 'jt/fetch-pack-negotiator' (af8ac73)
   1#include "cache.h"
   2#include "object-store.h"
   3#include "object.h"
   4#include "blob.h"
   5#include "tree.h"
   6#include "tree-walk.h"
   7#include "commit.h"
   8#include "tag.h"
   9#include "fsck.h"
  10#include "refs.h"
  11#include "utf8.h"
  12#include "sha1-array.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        /* warnings */ \
  70        FUNC(BAD_FILEMODE, WARN) \
  71        FUNC(EMPTY_NAME, WARN) \
  72        FUNC(FULL_PATHNAME, WARN) \
  73        FUNC(HAS_DOT, WARN) \
  74        FUNC(HAS_DOTDOT, WARN) \
  75        FUNC(HAS_DOTGIT, WARN) \
  76        FUNC(NULL_SHA1, WARN) \
  77        FUNC(ZERO_PADDED_FILEMODE, WARN) \
  78        FUNC(NUL_IN_COMMIT, WARN) \
  79        /* infos (reported as warnings, but ignored by default) */ \
  80        FUNC(GITMODULES_PARSE, INFO) \
  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
 320static int object_on_skiplist(struct fsck_options *opts, struct object *obj)
 321{
 322        if (opts && opts->skiplist && obj)
 323                return oid_array_lookup(opts->skiplist, &obj->oid) >= 0;
 324        return 0;
 325}
 326
 327__attribute__((format (printf, 4, 5)))
 328static int report(struct fsck_options *options, struct object *object,
 329        enum fsck_msg_id id, const char *fmt, ...)
 330{
 331        va_list ap;
 332        struct strbuf sb = STRBUF_INIT;
 333        int msg_type = fsck_msg_type(id, options), result;
 334
 335        if (msg_type == FSCK_IGNORE)
 336                return 0;
 337
 338        if (object_on_skiplist(options, object))
 339                return 0;
 340
 341        if (msg_type == FSCK_FATAL)
 342                msg_type = FSCK_ERROR;
 343        else if (msg_type == FSCK_INFO)
 344                msg_type = FSCK_WARN;
 345
 346        append_msg_id(&sb, msg_id_info[id].id_string);
 347
 348        va_start(ap, fmt);
 349        strbuf_vaddf(&sb, fmt, ap);
 350        result = options->error_func(options, object, msg_type, sb.buf);
 351        strbuf_release(&sb);
 352        va_end(ap);
 353
 354        return result;
 355}
 356
 357static char *get_object_name(struct fsck_options *options, struct object *obj)
 358{
 359        if (!options->object_names)
 360                return NULL;
 361        return lookup_decoration(options->object_names, obj);
 362}
 363
 364static void put_object_name(struct fsck_options *options, struct object *obj,
 365        const char *fmt, ...)
 366{
 367        va_list ap;
 368        struct strbuf buf = STRBUF_INIT;
 369        char *existing;
 370
 371        if (!options->object_names)
 372                return;
 373        existing = lookup_decoration(options->object_names, obj);
 374        if (existing)
 375                return;
 376        va_start(ap, fmt);
 377        strbuf_vaddf(&buf, fmt, ap);
 378        add_decoration(options->object_names, obj, strbuf_detach(&buf, NULL));
 379        va_end(ap);
 380}
 381
 382static const char *describe_object(struct fsck_options *o, struct object *obj)
 383{
 384        static struct strbuf buf = STRBUF_INIT;
 385        char *name;
 386
 387        strbuf_reset(&buf);
 388        strbuf_addstr(&buf, oid_to_hex(&obj->oid));
 389        if (o->object_names && (name = lookup_decoration(o->object_names, obj)))
 390                strbuf_addf(&buf, " (%s)", name);
 391
 392        return buf.buf;
 393}
 394
 395static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
 396{
 397        struct tree_desc desc;
 398        struct name_entry entry;
 399        int res = 0;
 400        const char *name;
 401
 402        if (parse_tree(tree))
 403                return -1;
 404
 405        name = get_object_name(options, &tree->object);
 406        if (init_tree_desc_gently(&desc, tree->buffer, tree->size))
 407                return -1;
 408        while (tree_entry_gently(&desc, &entry)) {
 409                struct object *obj;
 410                int result;
 411
 412                if (S_ISGITLINK(entry.mode))
 413                        continue;
 414
 415                if (S_ISDIR(entry.mode)) {
 416                        obj = (struct object *)lookup_tree(entry.oid);
 417                        if (name && obj)
 418                                put_object_name(options, obj, "%s%s/", name,
 419                                        entry.path);
 420                        result = options->walk(obj, OBJ_TREE, data, options);
 421                }
 422                else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
 423                        obj = (struct object *)lookup_blob(entry.oid);
 424                        if (name && obj)
 425                                put_object_name(options, obj, "%s%s", name,
 426                                        entry.path);
 427                        result = options->walk(obj, OBJ_BLOB, data, options);
 428                }
 429                else {
 430                        result = error("in tree %s: entry %s has bad mode %.6o",
 431                                        describe_object(options, &tree->object), entry.path, entry.mode);
 432                }
 433                if (result < 0)
 434                        return result;
 435                if (!res)
 436                        res = result;
 437        }
 438        return res;
 439}
 440
 441static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
 442{
 443        int counter = 0, generation = 0, name_prefix_len = 0;
 444        struct commit_list *parents;
 445        int res;
 446        int result;
 447        const char *name;
 448
 449        if (parse_commit(commit))
 450                return -1;
 451
 452        name = get_object_name(options, &commit->object);
 453        if (name)
 454                put_object_name(options, &get_commit_tree(commit)->object,
 455                                "%s:", name);
 456
 457        result = options->walk((struct object *)get_commit_tree(commit),
 458                               OBJ_TREE, data, options);
 459        if (result < 0)
 460                return result;
 461        res = result;
 462
 463        parents = commit->parents;
 464        if (name && parents) {
 465                int len = strlen(name), power;
 466
 467                if (len && name[len - 1] == '^') {
 468                        generation = 1;
 469                        name_prefix_len = len - 1;
 470                }
 471                else { /* parse ~<generation> suffix */
 472                        for (generation = 0, power = 1;
 473                             len && isdigit(name[len - 1]);
 474                             power *= 10)
 475                                generation += power * (name[--len] - '0');
 476                        if (power > 1 && len && name[len - 1] == '~')
 477                                name_prefix_len = len - 1;
 478                }
 479        }
 480
 481        while (parents) {
 482                if (name) {
 483                        struct object *obj = &parents->item->object;
 484
 485                        if (++counter > 1)
 486                                put_object_name(options, obj, "%s^%d",
 487                                        name, counter);
 488                        else if (generation > 0)
 489                                put_object_name(options, obj, "%.*s~%d",
 490                                        name_prefix_len, name, generation + 1);
 491                        else
 492                                put_object_name(options, obj, "%s^", name);
 493                }
 494                result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
 495                if (result < 0)
 496                        return result;
 497                if (!res)
 498                        res = result;
 499                parents = parents->next;
 500        }
 501        return res;
 502}
 503
 504static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
 505{
 506        char *name = get_object_name(options, &tag->object);
 507
 508        if (parse_tag(tag))
 509                return -1;
 510        if (name)
 511                put_object_name(options, tag->tagged, "%s", name);
 512        return options->walk(tag->tagged, OBJ_ANY, data, options);
 513}
 514
 515int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
 516{
 517        if (!obj)
 518                return -1;
 519
 520        if (obj->type == OBJ_NONE)
 521                parse_object(&obj->oid);
 522
 523        switch (obj->type) {
 524        case OBJ_BLOB:
 525                return 0;
 526        case OBJ_TREE:
 527                return fsck_walk_tree((struct tree *)obj, data, options);
 528        case OBJ_COMMIT:
 529                return fsck_walk_commit((struct commit *)obj, data, options);
 530        case OBJ_TAG:
 531                return fsck_walk_tag((struct tag *)obj, data, options);
 532        default:
 533                error("Unknown object type for %s", describe_object(options, obj));
 534                return -1;
 535        }
 536}
 537
 538/*
 539 * The entries in a tree are ordered in the _path_ order,
 540 * which means that a directory entry is ordered by adding
 541 * a slash to the end of it.
 542 *
 543 * So a directory called "a" is ordered _after_ a file
 544 * called "a.c", because "a/" sorts after "a.c".
 545 */
 546#define TREE_UNORDERED (-1)
 547#define TREE_HAS_DUPS  (-2)
 548
 549static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
 550{
 551        int len1 = strlen(name1);
 552        int len2 = strlen(name2);
 553        int len = len1 < len2 ? len1 : len2;
 554        unsigned char c1, c2;
 555        int cmp;
 556
 557        cmp = memcmp(name1, name2, len);
 558        if (cmp < 0)
 559                return 0;
 560        if (cmp > 0)
 561                return TREE_UNORDERED;
 562
 563        /*
 564         * Ok, the first <len> characters are the same.
 565         * Now we need to order the next one, but turn
 566         * a '\0' into a '/' for a directory entry.
 567         */
 568        c1 = name1[len];
 569        c2 = name2[len];
 570        if (!c1 && !c2)
 571                /*
 572                 * git-write-tree used to write out a nonsense tree that has
 573                 * entries with the same name, one blob and one tree.  Make
 574                 * sure we do not have duplicate entries.
 575                 */
 576                return TREE_HAS_DUPS;
 577        if (!c1 && S_ISDIR(mode1))
 578                c1 = '/';
 579        if (!c2 && S_ISDIR(mode2))
 580                c2 = '/';
 581        return c1 < c2 ? 0 : TREE_UNORDERED;
 582}
 583
 584static int fsck_tree(struct tree *item, struct fsck_options *options)
 585{
 586        int retval = 0;
 587        int has_null_sha1 = 0;
 588        int has_full_path = 0;
 589        int has_empty_name = 0;
 590        int has_dot = 0;
 591        int has_dotdot = 0;
 592        int has_dotgit = 0;
 593        int has_zero_pad = 0;
 594        int has_bad_modes = 0;
 595        int has_dup_entries = 0;
 596        int not_properly_sorted = 0;
 597        struct tree_desc desc;
 598        unsigned o_mode;
 599        const char *o_name;
 600
 601        if (init_tree_desc_gently(&desc, item->buffer, item->size)) {
 602                retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 603                return retval;
 604        }
 605
 606        o_mode = 0;
 607        o_name = NULL;
 608
 609        while (desc.size) {
 610                unsigned mode;
 611                const char *name;
 612                const struct object_id *oid;
 613
 614                oid = tree_entry_extract(&desc, &name, &mode);
 615
 616                has_null_sha1 |= is_null_oid(oid);
 617                has_full_path |= !!strchr(name, '/');
 618                has_empty_name |= !*name;
 619                has_dot |= !strcmp(name, ".");
 620                has_dotdot |= !strcmp(name, "..");
 621                has_dotgit |= is_hfs_dotgit(name) || is_ntfs_dotgit(name);
 622                has_zero_pad |= *(char *)desc.buffer == '0';
 623
 624                if (is_hfs_dotgitmodules(name) || is_ntfs_dotgitmodules(name)) {
 625                        if (!S_ISLNK(mode))
 626                                oidset_insert(&gitmodules_found, oid);
 627                        else
 628                                retval += report(options, &item->object,
 629                                                 FSCK_MSG_GITMODULES_SYMLINK,
 630                                                 ".gitmodules is a symbolic link");
 631                }
 632
 633                if (update_tree_entry_gently(&desc)) {
 634                        retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 635                        break;
 636                }
 637
 638                switch (mode) {
 639                /*
 640                 * Standard modes..
 641                 */
 642                case S_IFREG | 0755:
 643                case S_IFREG | 0644:
 644                case S_IFLNK:
 645                case S_IFDIR:
 646                case S_IFGITLINK:
 647                        break;
 648                /*
 649                 * This is nonstandard, but we had a few of these
 650                 * early on when we honored the full set of mode
 651                 * bits..
 652                 */
 653                case S_IFREG | 0664:
 654                        if (!options->strict)
 655                                break;
 656                        /* fallthrough */
 657                default:
 658                        has_bad_modes = 1;
 659                }
 660
 661                if (o_name) {
 662                        switch (verify_ordered(o_mode, o_name, mode, name)) {
 663                        case TREE_UNORDERED:
 664                                not_properly_sorted = 1;
 665                                break;
 666                        case TREE_HAS_DUPS:
 667                                has_dup_entries = 1;
 668                                break;
 669                        default:
 670                                break;
 671                        }
 672                }
 673
 674                o_mode = mode;
 675                o_name = name;
 676        }
 677
 678        if (has_null_sha1)
 679                retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
 680        if (has_full_path)
 681                retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
 682        if (has_empty_name)
 683                retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
 684        if (has_dot)
 685                retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
 686        if (has_dotdot)
 687                retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
 688        if (has_dotgit)
 689                retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
 690        if (has_zero_pad)
 691                retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
 692        if (has_bad_modes)
 693                retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
 694        if (has_dup_entries)
 695                retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
 696        if (not_properly_sorted)
 697                retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
 698        return retval;
 699}
 700
 701static int verify_headers(const void *data, unsigned long size,
 702                          struct object *obj, struct fsck_options *options)
 703{
 704        const char *buffer = (const char *)data;
 705        unsigned long i;
 706
 707        for (i = 0; i < size; i++) {
 708                switch (buffer[i]) {
 709                case '\0':
 710                        return report(options, obj,
 711                                FSCK_MSG_NUL_IN_HEADER,
 712                                "unterminated header: NUL at offset %ld", i);
 713                case '\n':
 714                        if (i + 1 < size && buffer[i + 1] == '\n')
 715                                return 0;
 716                }
 717        }
 718
 719        /*
 720         * We did not find double-LF that separates the header
 721         * and the body.  Not having a body is not a crime but
 722         * we do want to see the terminating LF for the last header
 723         * line.
 724         */
 725        if (size && buffer[size - 1] == '\n')
 726                return 0;
 727
 728        return report(options, obj,
 729                FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
 730}
 731
 732static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
 733{
 734        const char *p = *ident;
 735        char *end;
 736
 737        *ident = strchrnul(*ident, '\n');
 738        if (**ident == '\n')
 739                (*ident)++;
 740
 741        if (*p == '<')
 742                return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 743        p += strcspn(p, "<>\n");
 744        if (*p == '>')
 745                return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
 746        if (*p != '<')
 747                return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
 748        if (p[-1] != ' ')
 749                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 750        p++;
 751        p += strcspn(p, "<>\n");
 752        if (*p != '>')
 753                return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
 754        p++;
 755        if (*p != ' ')
 756                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
 757        p++;
 758        if (*p == '0' && p[1] != ' ')
 759                return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
 760        if (date_overflows(parse_timestamp(p, &end, 10)))
 761                return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
 762        if ((end == p || *end != ' '))
 763                return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
 764        p = end + 1;
 765        if ((*p != '+' && *p != '-') ||
 766            !isdigit(p[1]) ||
 767            !isdigit(p[2]) ||
 768            !isdigit(p[3]) ||
 769            !isdigit(p[4]) ||
 770            (p[5] != '\n'))
 771                return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
 772        p += 6;
 773        return 0;
 774}
 775
 776static int fsck_commit_buffer(struct commit *commit, const char *buffer,
 777        unsigned long size, struct fsck_options *options)
 778{
 779        struct object_id tree_oid, oid;
 780        struct commit_graft *graft;
 781        unsigned parent_count, parent_line_count = 0, author_count;
 782        int err;
 783        const char *buffer_begin = buffer;
 784        const char *p;
 785
 786        if (verify_headers(buffer, size, &commit->object, options))
 787                return -1;
 788
 789        if (!skip_prefix(buffer, "tree ", &buffer))
 790                return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
 791        if (parse_oid_hex(buffer, &tree_oid, &p) || *p != '\n') {
 792                err = report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
 793                if (err)
 794                        return err;
 795        }
 796        buffer = p + 1;
 797        while (skip_prefix(buffer, "parent ", &buffer)) {
 798                if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
 799                        err = report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
 800                        if (err)
 801                                return err;
 802                }
 803                buffer = p + 1;
 804                parent_line_count++;
 805        }
 806        graft = lookup_commit_graft(the_repository, &commit->object.oid);
 807        parent_count = commit_list_count(commit->parents);
 808        if (graft) {
 809                if (graft->nr_parent == -1 && !parent_count)
 810                        ; /* shallow commit */
 811                else if (graft->nr_parent != parent_count) {
 812                        err = report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
 813                        if (err)
 814                                return err;
 815                }
 816        } else {
 817                if (parent_count != parent_line_count) {
 818                        err = report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
 819                        if (err)
 820                                return err;
 821                }
 822        }
 823        author_count = 0;
 824        while (skip_prefix(buffer, "author ", &buffer)) {
 825                author_count++;
 826                err = fsck_ident(&buffer, &commit->object, options);
 827                if (err)
 828                        return err;
 829        }
 830        if (author_count < 1)
 831                err = report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
 832        else if (author_count > 1)
 833                err = report(options, &commit->object, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
 834        if (err)
 835                return err;
 836        if (!skip_prefix(buffer, "committer ", &buffer))
 837                return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
 838        err = fsck_ident(&buffer, &commit->object, options);
 839        if (err)
 840                return err;
 841        if (!get_commit_tree(commit)) {
 842                err = report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", oid_to_hex(&tree_oid));
 843                if (err)
 844                        return err;
 845        }
 846        if (memchr(buffer_begin, '\0', size)) {
 847                err = report(options, &commit->object, FSCK_MSG_NUL_IN_COMMIT,
 848                             "NUL byte in the commit object body");
 849                if (err)
 850                        return err;
 851        }
 852        return 0;
 853}
 854
 855static int fsck_commit(struct commit *commit, const char *data,
 856        unsigned long size, struct fsck_options *options)
 857{
 858        const char *buffer = data ?  data : get_commit_buffer(commit, &size);
 859        int ret = fsck_commit_buffer(commit, buffer, size, options);
 860        if (!data)
 861                unuse_commit_buffer(commit, buffer);
 862        return ret;
 863}
 864
 865static int fsck_tag_buffer(struct tag *tag, const char *data,
 866        unsigned long size, struct fsck_options *options)
 867{
 868        struct object_id oid;
 869        int ret = 0;
 870        const char *buffer;
 871        char *to_free = NULL, *eol;
 872        struct strbuf sb = STRBUF_INIT;
 873        const char *p;
 874
 875        if (data)
 876                buffer = data;
 877        else {
 878                enum object_type type;
 879
 880                buffer = to_free =
 881                        read_object_file(&tag->object.oid, &type, &size);
 882                if (!buffer)
 883                        return report(options, &tag->object,
 884                                FSCK_MSG_MISSING_TAG_OBJECT,
 885                                "cannot read tag object");
 886
 887                if (type != OBJ_TAG) {
 888                        ret = report(options, &tag->object,
 889                                FSCK_MSG_TAG_OBJECT_NOT_TAG,
 890                                "expected tag got %s",
 891                            type_name(type));
 892                        goto done;
 893                }
 894        }
 895
 896        ret = verify_headers(buffer, size, &tag->object, options);
 897        if (ret)
 898                goto done;
 899
 900        if (!skip_prefix(buffer, "object ", &buffer)) {
 901                ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
 902                goto done;
 903        }
 904        if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
 905                ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
 906                if (ret)
 907                        goto done;
 908        }
 909        buffer = p + 1;
 910
 911        if (!skip_prefix(buffer, "type ", &buffer)) {
 912                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
 913                goto done;
 914        }
 915        eol = strchr(buffer, '\n');
 916        if (!eol) {
 917                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
 918                goto done;
 919        }
 920        if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
 921                ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
 922        if (ret)
 923                goto done;
 924        buffer = eol + 1;
 925
 926        if (!skip_prefix(buffer, "tag ", &buffer)) {
 927                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
 928                goto done;
 929        }
 930        eol = strchr(buffer, '\n');
 931        if (!eol) {
 932                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
 933                goto done;
 934        }
 935        strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
 936        if (check_refname_format(sb.buf, 0)) {
 937                ret = report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
 938                           "invalid 'tag' name: %.*s",
 939                           (int)(eol - buffer), buffer);
 940                if (ret)
 941                        goto done;
 942        }
 943        buffer = eol + 1;
 944
 945        if (!skip_prefix(buffer, "tagger ", &buffer)) {
 946                /* early tags do not contain 'tagger' lines; warn only */
 947                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
 948                if (ret)
 949                        goto done;
 950        }
 951        else
 952                ret = fsck_ident(&buffer, &tag->object, options);
 953
 954done:
 955        strbuf_release(&sb);
 956        free(to_free);
 957        return ret;
 958}
 959
 960static int fsck_tag(struct tag *tag, const char *data,
 961        unsigned long size, struct fsck_options *options)
 962{
 963        struct object *tagged = tag->tagged;
 964
 965        if (!tagged)
 966                return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
 967
 968        return fsck_tag_buffer(tag, data, size, options);
 969}
 970
 971struct fsck_gitmodules_data {
 972        struct object *obj;
 973        struct fsck_options *options;
 974        int ret;
 975};
 976
 977static int fsck_gitmodules_fn(const char *var, const char *value, void *vdata)
 978{
 979        struct fsck_gitmodules_data *data = vdata;
 980        const char *subsection, *key;
 981        int subsection_len;
 982        char *name;
 983
 984        if (parse_config_key(var, "submodule", &subsection, &subsection_len, &key) < 0 ||
 985            !subsection)
 986                return 0;
 987
 988        name = xmemdupz(subsection, subsection_len);
 989        if (check_submodule_name(name) < 0)
 990                data->ret |= report(data->options, data->obj,
 991                                    FSCK_MSG_GITMODULES_NAME,
 992                                    "disallowed submodule name: %s",
 993                                    name);
 994        free(name);
 995
 996        return 0;
 997}
 998
 999static int fsck_blob(struct blob *blob, const char *buf,
1000                     unsigned long size, struct fsck_options *options)
1001{
1002        struct fsck_gitmodules_data data;
1003        struct config_options config_opts = { 0 };
1004
1005        if (!oidset_contains(&gitmodules_found, &blob->object.oid))
1006                return 0;
1007        oidset_insert(&gitmodules_done, &blob->object.oid);
1008
1009        if (object_on_skiplist(options, &blob->object))
1010                return 0;
1011
1012        if (!buf) {
1013                /*
1014                 * A missing buffer here is a sign that the caller found the
1015                 * blob too gigantic to load into memory. Let's just consider
1016                 * that an error.
1017                 */
1018                return report(options, &blob->object,
1019                              FSCK_MSG_GITMODULES_LARGE,
1020                              ".gitmodules too large to parse");
1021        }
1022
1023        data.obj = &blob->object;
1024        data.options = options;
1025        data.ret = 0;
1026        config_opts.error_action = CONFIG_ERROR_SILENT;
1027        if (git_config_from_mem(fsck_gitmodules_fn, CONFIG_ORIGIN_BLOB,
1028                                ".gitmodules", buf, size, &data, &config_opts))
1029                data.ret |= report(options, &blob->object,
1030                                   FSCK_MSG_GITMODULES_PARSE,
1031                                   "could not parse gitmodules blob");
1032
1033        return data.ret;
1034}
1035
1036int fsck_object(struct object *obj, void *data, unsigned long size,
1037        struct fsck_options *options)
1038{
1039        if (!obj)
1040                return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
1041
1042        if (obj->type == OBJ_BLOB)
1043                return fsck_blob((struct blob *)obj, data, size, options);
1044        if (obj->type == OBJ_TREE)
1045                return fsck_tree((struct tree *) obj, options);
1046        if (obj->type == OBJ_COMMIT)
1047                return fsck_commit((struct commit *) obj, (const char *) data,
1048                        size, options);
1049        if (obj->type == OBJ_TAG)
1050                return fsck_tag((struct tag *) obj, (const char *) data,
1051                        size, options);
1052
1053        return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
1054                          obj->type);
1055}
1056
1057int fsck_error_function(struct fsck_options *o,
1058        struct object *obj, int msg_type, const char *message)
1059{
1060        if (msg_type == FSCK_WARN) {
1061                warning("object %s: %s", describe_object(o, obj), message);
1062                return 0;
1063        }
1064        error("object %s: %s", describe_object(o, obj), message);
1065        return 1;
1066}
1067
1068int fsck_finish(struct fsck_options *options)
1069{
1070        int ret = 0;
1071        struct oidset_iter iter;
1072        const struct object_id *oid;
1073
1074        oidset_iter_init(&gitmodules_found, &iter);
1075        while ((oid = oidset_iter_next(&iter))) {
1076                struct blob *blob;
1077                enum object_type type;
1078                unsigned long size;
1079                char *buf;
1080
1081                if (oidset_contains(&gitmodules_done, oid))
1082                        continue;
1083
1084                blob = lookup_blob(oid);
1085                if (!blob) {
1086                        struct object *obj = lookup_unknown_object(oid->hash);
1087                        ret |= report(options, obj,
1088                                      FSCK_MSG_GITMODULES_BLOB,
1089                                      "non-blob found at .gitmodules");
1090                        continue;
1091                }
1092
1093                buf = read_object_file(oid, &type, &size);
1094                if (!buf) {
1095                        if (is_promisor_object(&blob->object.oid))
1096                                continue;
1097                        ret |= report(options, &blob->object,
1098                                      FSCK_MSG_GITMODULES_MISSING,
1099                                      "unable to read .gitmodules blob");
1100                        continue;
1101                }
1102
1103                if (type == OBJ_BLOB)
1104                        ret |= fsck_blob(blob, buf, size, options);
1105                else
1106                        ret |= report(options, &blob->object,
1107                                      FSCK_MSG_GITMODULES_BLOB,
1108                                      "non-blob found at .gitmodules");
1109                free(buf);
1110        }
1111
1112
1113        oidset_clear(&gitmodules_found);
1114        oidset_clear(&gitmodules_done);
1115        return ret;
1116}