Andrew's git / gitweb.git / fsck.c
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fsck.con commit Merge branch 'tb/config-default' (26a4643)
   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_PARSE, 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(BAD_TAG_NAME, INFO) \
  81        FUNC(MISSING_TAGGER_ENTRY, INFO)
  82
  83#define MSG_ID(id, msg_type) FSCK_MSG_##id,
  84enum fsck_msg_id {
  85        FOREACH_MSG_ID(MSG_ID)
  86        FSCK_MSG_MAX
  87};
  88#undef MSG_ID
  89
  90#define STR(x) #x
  91#define MSG_ID(id, msg_type) { STR(id), NULL, NULL, FSCK_##msg_type },
  92static struct {
  93        const char *id_string;
  94        const char *downcased;
  95        const char *camelcased;
  96        int msg_type;
  97} msg_id_info[FSCK_MSG_MAX + 1] = {
  98        FOREACH_MSG_ID(MSG_ID)
  99        { NULL, NULL, NULL, -1 }
 100};
 101#undef MSG_ID
 102
 103static void prepare_msg_ids(void)
 104{
 105        int i;
 106
 107        if (msg_id_info[0].downcased)
 108                return;
 109
 110        /* convert id_string to lower case, without underscores. */
 111        for (i = 0; i < FSCK_MSG_MAX; i++) {
 112                const char *p = msg_id_info[i].id_string;
 113                int len = strlen(p);
 114                char *q = xmalloc(len);
 115
 116                msg_id_info[i].downcased = q;
 117                while (*p)
 118                        if (*p == '_')
 119                                p++;
 120                        else
 121                                *(q)++ = tolower(*(p)++);
 122                *q = '\0';
 123
 124                p = msg_id_info[i].id_string;
 125                q = xmalloc(len);
 126                msg_id_info[i].camelcased = q;
 127                while (*p) {
 128                        if (*p == '_') {
 129                                p++;
 130                                if (*p)
 131                                        *q++ = *p++;
 132                        } else {
 133                                *q++ = tolower(*p++);
 134                        }
 135                }
 136                *q = '\0';
 137        }
 138}
 139
 140static int parse_msg_id(const char *text)
 141{
 142        int i;
 143
 144        prepare_msg_ids();
 145
 146        for (i = 0; i < FSCK_MSG_MAX; i++)
 147                if (!strcmp(text, msg_id_info[i].downcased))
 148                        return i;
 149
 150        return -1;
 151}
 152
 153void list_config_fsck_msg_ids(struct string_list *list, const char *prefix)
 154{
 155        int i;
 156
 157        prepare_msg_ids();
 158
 159        for (i = 0; i < FSCK_MSG_MAX; i++)
 160                list_config_item(list, prefix, msg_id_info[i].camelcased);
 161}
 162
 163static int fsck_msg_type(enum fsck_msg_id msg_id,
 164        struct fsck_options *options)
 165{
 166        int msg_type;
 167
 168        assert(msg_id >= 0 && msg_id < FSCK_MSG_MAX);
 169
 170        if (options->msg_type)
 171                msg_type = options->msg_type[msg_id];
 172        else {
 173                msg_type = msg_id_info[msg_id].msg_type;
 174                if (options->strict && msg_type == FSCK_WARN)
 175                        msg_type = FSCK_ERROR;
 176        }
 177
 178        return msg_type;
 179}
 180
 181static void init_skiplist(struct fsck_options *options, const char *path)
 182{
 183        static struct oid_array skiplist = OID_ARRAY_INIT;
 184        int sorted, fd;
 185        char buffer[GIT_MAX_HEXSZ + 1];
 186        struct object_id oid;
 187
 188        if (options->skiplist)
 189                sorted = options->skiplist->sorted;
 190        else {
 191                sorted = 1;
 192                options->skiplist = &skiplist;
 193        }
 194
 195        fd = open(path, O_RDONLY);
 196        if (fd < 0)
 197                die("Could not open skip list: %s", path);
 198        for (;;) {
 199                const char *p;
 200                int result = read_in_full(fd, buffer, sizeof(buffer));
 201                if (result < 0)
 202                        die_errno("Could not read '%s'", path);
 203                if (!result)
 204                        break;
 205                if (parse_oid_hex(buffer, &oid, &p) || *p != '\n')
 206                        die("Invalid SHA-1: %s", buffer);
 207                oid_array_append(&skiplist, &oid);
 208                if (sorted && skiplist.nr > 1 &&
 209                                oidcmp(&skiplist.oid[skiplist.nr - 2],
 210                                       &oid) > 0)
 211                        sorted = 0;
 212        }
 213        close(fd);
 214
 215        if (sorted)
 216                skiplist.sorted = 1;
 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        if (opts && opts->skiplist && obj)
 322                return oid_array_lookup(opts->skiplist, &obj->oid) >= 0;
 323        return 0;
 324}
 325
 326__attribute__((format (printf, 4, 5)))
 327static int report(struct fsck_options *options, struct object *object,
 328        enum fsck_msg_id id, const char *fmt, ...)
 329{
 330        va_list ap;
 331        struct strbuf sb = STRBUF_INIT;
 332        int msg_type = fsck_msg_type(id, options), result;
 333
 334        if (msg_type == FSCK_IGNORE)
 335                return 0;
 336
 337        if (object_on_skiplist(options, object))
 338                return 0;
 339
 340        if (msg_type == FSCK_FATAL)
 341                msg_type = FSCK_ERROR;
 342        else if (msg_type == FSCK_INFO)
 343                msg_type = FSCK_WARN;
 344
 345        append_msg_id(&sb, msg_id_info[id].id_string);
 346
 347        va_start(ap, fmt);
 348        strbuf_vaddf(&sb, fmt, ap);
 349        result = options->error_func(options, object, msg_type, sb.buf);
 350        strbuf_release(&sb);
 351        va_end(ap);
 352
 353        return result;
 354}
 355
 356static char *get_object_name(struct fsck_options *options, struct object *obj)
 357{
 358        if (!options->object_names)
 359                return NULL;
 360        return lookup_decoration(options->object_names, obj);
 361}
 362
 363static void put_object_name(struct fsck_options *options, struct object *obj,
 364        const char *fmt, ...)
 365{
 366        va_list ap;
 367        struct strbuf buf = STRBUF_INIT;
 368        char *existing;
 369
 370        if (!options->object_names)
 371                return;
 372        existing = lookup_decoration(options->object_names, obj);
 373        if (existing)
 374                return;
 375        va_start(ap, fmt);
 376        strbuf_vaddf(&buf, fmt, ap);
 377        add_decoration(options->object_names, obj, strbuf_detach(&buf, NULL));
 378        va_end(ap);
 379}
 380
 381static const char *describe_object(struct fsck_options *o, struct object *obj)
 382{
 383        static struct strbuf buf = STRBUF_INIT;
 384        char *name;
 385
 386        strbuf_reset(&buf);
 387        strbuf_addstr(&buf, oid_to_hex(&obj->oid));
 388        if (o->object_names && (name = lookup_decoration(o->object_names, obj)))
 389                strbuf_addf(&buf, " (%s)", name);
 390
 391        return buf.buf;
 392}
 393
 394static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
 395{
 396        struct tree_desc desc;
 397        struct name_entry entry;
 398        int res = 0;
 399        const char *name;
 400
 401        if (parse_tree(tree))
 402                return -1;
 403
 404        name = get_object_name(options, &tree->object);
 405        if (init_tree_desc_gently(&desc, tree->buffer, tree->size))
 406                return -1;
 407        while (tree_entry_gently(&desc, &entry)) {
 408                struct object *obj;
 409                int result;
 410
 411                if (S_ISGITLINK(entry.mode))
 412                        continue;
 413
 414                if (S_ISDIR(entry.mode)) {
 415                        obj = (struct object *)lookup_tree(entry.oid);
 416                        if (name && obj)
 417                                put_object_name(options, obj, "%s%s/", name,
 418                                        entry.path);
 419                        result = options->walk(obj, OBJ_TREE, data, options);
 420                }
 421                else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
 422                        obj = (struct object *)lookup_blob(entry.oid);
 423                        if (name && obj)
 424                                put_object_name(options, obj, "%s%s", name,
 425                                        entry.path);
 426                        result = options->walk(obj, OBJ_BLOB, data, options);
 427                }
 428                else {
 429                        result = error("in tree %s: entry %s has bad mode %.6o",
 430                                        describe_object(options, &tree->object), entry.path, entry.mode);
 431                }
 432                if (result < 0)
 433                        return result;
 434                if (!res)
 435                        res = result;
 436        }
 437        return res;
 438}
 439
 440static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
 441{
 442        int counter = 0, generation = 0, name_prefix_len = 0;
 443        struct commit_list *parents;
 444        int res;
 445        int result;
 446        const char *name;
 447
 448        if (parse_commit(commit))
 449                return -1;
 450
 451        name = get_object_name(options, &commit->object);
 452        if (name)
 453                put_object_name(options, &get_commit_tree(commit)->object,
 454                                "%s:", name);
 455
 456        result = options->walk((struct object *)get_commit_tree(commit),
 457                               OBJ_TREE, data, options);
 458        if (result < 0)
 459                return result;
 460        res = result;
 461
 462        parents = commit->parents;
 463        if (name && parents) {
 464                int len = strlen(name), power;
 465
 466                if (len && name[len - 1] == '^') {
 467                        generation = 1;
 468                        name_prefix_len = len - 1;
 469                }
 470                else { /* parse ~<generation> suffix */
 471                        for (generation = 0, power = 1;
 472                             len && isdigit(name[len - 1]);
 473                             power *= 10)
 474                                generation += power * (name[--len] - '0');
 475                        if (power > 1 && len && name[len - 1] == '~')
 476                                name_prefix_len = len - 1;
 477                }
 478        }
 479
 480        while (parents) {
 481                if (name) {
 482                        struct object *obj = &parents->item->object;
 483
 484                        if (++counter > 1)
 485                                put_object_name(options, obj, "%s^%d",
 486                                        name, counter);
 487                        else if (generation > 0)
 488                                put_object_name(options, obj, "%.*s~%d",
 489                                        name_prefix_len, name, generation + 1);
 490                        else
 491                                put_object_name(options, obj, "%s^", name);
 492                }
 493                result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
 494                if (result < 0)
 495                        return result;
 496                if (!res)
 497                        res = result;
 498                parents = parents->next;
 499        }
 500        return res;
 501}
 502
 503static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
 504{
 505        char *name = get_object_name(options, &tag->object);
 506
 507        if (parse_tag(tag))
 508                return -1;
 509        if (name)
 510                put_object_name(options, tag->tagged, "%s", name);
 511        return options->walk(tag->tagged, OBJ_ANY, data, options);
 512}
 513
 514int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
 515{
 516        if (!obj)
 517                return -1;
 518
 519        if (obj->type == OBJ_NONE)
 520                parse_object(&obj->oid);
 521
 522        switch (obj->type) {
 523        case OBJ_BLOB:
 524                return 0;
 525        case OBJ_TREE:
 526                return fsck_walk_tree((struct tree *)obj, data, options);
 527        case OBJ_COMMIT:
 528                return fsck_walk_commit((struct commit *)obj, data, options);
 529        case OBJ_TAG:
 530                return fsck_walk_tag((struct tag *)obj, data, options);
 531        default:
 532                error("Unknown object type for %s", describe_object(options, obj));
 533                return -1;
 534        }
 535}
 536
 537/*
 538 * The entries in a tree are ordered in the _path_ order,
 539 * which means that a directory entry is ordered by adding
 540 * a slash to the end of it.
 541 *
 542 * So a directory called "a" is ordered _after_ a file
 543 * called "a.c", because "a/" sorts after "a.c".
 544 */
 545#define TREE_UNORDERED (-1)
 546#define TREE_HAS_DUPS  (-2)
 547
 548static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
 549{
 550        int len1 = strlen(name1);
 551        int len2 = strlen(name2);
 552        int len = len1 < len2 ? len1 : len2;
 553        unsigned char c1, c2;
 554        int cmp;
 555
 556        cmp = memcmp(name1, name2, len);
 557        if (cmp < 0)
 558                return 0;
 559        if (cmp > 0)
 560                return TREE_UNORDERED;
 561
 562        /*
 563         * Ok, the first <len> characters are the same.
 564         * Now we need to order the next one, but turn
 565         * a '\0' into a '/' for a directory entry.
 566         */
 567        c1 = name1[len];
 568        c2 = name2[len];
 569        if (!c1 && !c2)
 570                /*
 571                 * git-write-tree used to write out a nonsense tree that has
 572                 * entries with the same name, one blob and one tree.  Make
 573                 * sure we do not have duplicate entries.
 574                 */
 575                return TREE_HAS_DUPS;
 576        if (!c1 && S_ISDIR(mode1))
 577                c1 = '/';
 578        if (!c2 && S_ISDIR(mode2))
 579                c2 = '/';
 580        return c1 < c2 ? 0 : TREE_UNORDERED;
 581}
 582
 583static int fsck_tree(struct tree *item, struct fsck_options *options)
 584{
 585        int retval = 0;
 586        int has_null_sha1 = 0;
 587        int has_full_path = 0;
 588        int has_empty_name = 0;
 589        int has_dot = 0;
 590        int has_dotdot = 0;
 591        int has_dotgit = 0;
 592        int has_zero_pad = 0;
 593        int has_bad_modes = 0;
 594        int has_dup_entries = 0;
 595        int not_properly_sorted = 0;
 596        struct tree_desc desc;
 597        unsigned o_mode;
 598        const char *o_name;
 599
 600        if (init_tree_desc_gently(&desc, item->buffer, item->size)) {
 601                retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 602                return retval;
 603        }
 604
 605        o_mode = 0;
 606        o_name = NULL;
 607
 608        while (desc.size) {
 609                unsigned mode;
 610                const char *name;
 611                const struct object_id *oid;
 612
 613                oid = tree_entry_extract(&desc, &name, &mode);
 614
 615                has_null_sha1 |= is_null_oid(oid);
 616                has_full_path |= !!strchr(name, '/');
 617                has_empty_name |= !*name;
 618                has_dot |= !strcmp(name, ".");
 619                has_dotdot |= !strcmp(name, "..");
 620                has_dotgit |= is_hfs_dotgit(name) || is_ntfs_dotgit(name);
 621                has_zero_pad |= *(char *)desc.buffer == '0';
 622
 623                if (is_hfs_dotgitmodules(name) || is_ntfs_dotgitmodules(name)) {
 624                        if (!S_ISLNK(mode))
 625                                oidset_insert(&gitmodules_found, oid);
 626                        else
 627                                retval += report(options, &item->object,
 628                                                 FSCK_MSG_GITMODULES_SYMLINK,
 629                                                 ".gitmodules is a symbolic link");
 630                }
 631
 632                if (update_tree_entry_gently(&desc)) {
 633                        retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 634                        break;
 635                }
 636
 637                switch (mode) {
 638                /*
 639                 * Standard modes..
 640                 */
 641                case S_IFREG | 0755:
 642                case S_IFREG | 0644:
 643                case S_IFLNK:
 644                case S_IFDIR:
 645                case S_IFGITLINK:
 646                        break;
 647                /*
 648                 * This is nonstandard, but we had a few of these
 649                 * early on when we honored the full set of mode
 650                 * bits..
 651                 */
 652                case S_IFREG | 0664:
 653                        if (!options->strict)
 654                                break;
 655                        /* fallthrough */
 656                default:
 657                        has_bad_modes = 1;
 658                }
 659
 660                if (o_name) {
 661                        switch (verify_ordered(o_mode, o_name, mode, name)) {
 662                        case TREE_UNORDERED:
 663                                not_properly_sorted = 1;
 664                                break;
 665                        case TREE_HAS_DUPS:
 666                                has_dup_entries = 1;
 667                                break;
 668                        default:
 669                                break;
 670                        }
 671                }
 672
 673                o_mode = mode;
 674                o_name = name;
 675        }
 676
 677        if (has_null_sha1)
 678                retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
 679        if (has_full_path)
 680                retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
 681        if (has_empty_name)
 682                retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
 683        if (has_dot)
 684                retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
 685        if (has_dotdot)
 686                retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
 687        if (has_dotgit)
 688                retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
 689        if (has_zero_pad)
 690                retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
 691        if (has_bad_modes)
 692                retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
 693        if (has_dup_entries)
 694                retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
 695        if (not_properly_sorted)
 696                retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
 697        return retval;
 698}
 699
 700static int verify_headers(const void *data, unsigned long size,
 701                          struct object *obj, struct fsck_options *options)
 702{
 703        const char *buffer = (const char *)data;
 704        unsigned long i;
 705
 706        for (i = 0; i < size; i++) {
 707                switch (buffer[i]) {
 708                case '\0':
 709                        return report(options, obj,
 710                                FSCK_MSG_NUL_IN_HEADER,
 711                                "unterminated header: NUL at offset %ld", i);
 712                case '\n':
 713                        if (i + 1 < size && buffer[i + 1] == '\n')
 714                                return 0;
 715                }
 716        }
 717
 718        /*
 719         * We did not find double-LF that separates the header
 720         * and the body.  Not having a body is not a crime but
 721         * we do want to see the terminating LF for the last header
 722         * line.
 723         */
 724        if (size && buffer[size - 1] == '\n')
 725                return 0;
 726
 727        return report(options, obj,
 728                FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
 729}
 730
 731static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
 732{
 733        const char *p = *ident;
 734        char *end;
 735
 736        *ident = strchrnul(*ident, '\n');
 737        if (**ident == '\n')
 738                (*ident)++;
 739
 740        if (*p == '<')
 741                return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 742        p += strcspn(p, "<>\n");
 743        if (*p == '>')
 744                return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
 745        if (*p != '<')
 746                return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
 747        if (p[-1] != ' ')
 748                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 749        p++;
 750        p += strcspn(p, "<>\n");
 751        if (*p != '>')
 752                return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
 753        p++;
 754        if (*p != ' ')
 755                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
 756        p++;
 757        if (*p == '0' && p[1] != ' ')
 758                return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
 759        if (date_overflows(parse_timestamp(p, &end, 10)))
 760                return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
 761        if ((end == p || *end != ' '))
 762                return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
 763        p = end + 1;
 764        if ((*p != '+' && *p != '-') ||
 765            !isdigit(p[1]) ||
 766            !isdigit(p[2]) ||
 767            !isdigit(p[3]) ||
 768            !isdigit(p[4]) ||
 769            (p[5] != '\n'))
 770                return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
 771        p += 6;
 772        return 0;
 773}
 774
 775static int fsck_commit_buffer(struct commit *commit, const char *buffer,
 776        unsigned long size, struct fsck_options *options)
 777{
 778        struct object_id tree_oid, oid;
 779        struct commit_graft *graft;
 780        unsigned parent_count, parent_line_count = 0, author_count;
 781        int err;
 782        const char *buffer_begin = buffer;
 783        const char *p;
 784
 785        if (verify_headers(buffer, size, &commit->object, options))
 786                return -1;
 787
 788        if (!skip_prefix(buffer, "tree ", &buffer))
 789                return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
 790        if (parse_oid_hex(buffer, &tree_oid, &p) || *p != '\n') {
 791                err = report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
 792                if (err)
 793                        return err;
 794        }
 795        buffer = p + 1;
 796        while (skip_prefix(buffer, "parent ", &buffer)) {
 797                if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
 798                        err = report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
 799                        if (err)
 800                                return err;
 801                }
 802                buffer = p + 1;
 803                parent_line_count++;
 804        }
 805        graft = lookup_commit_graft(the_repository, &commit->object.oid);
 806        parent_count = commit_list_count(commit->parents);
 807        if (graft) {
 808                if (graft->nr_parent == -1 && !parent_count)
 809                        ; /* shallow commit */
 810                else if (graft->nr_parent != parent_count) {
 811                        err = report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
 812                        if (err)
 813                                return err;
 814                }
 815        } else {
 816                if (parent_count != parent_line_count) {
 817                        err = report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
 818                        if (err)
 819                                return err;
 820                }
 821        }
 822        author_count = 0;
 823        while (skip_prefix(buffer, "author ", &buffer)) {
 824                author_count++;
 825                err = fsck_ident(&buffer, &commit->object, options);
 826                if (err)
 827                        return err;
 828        }
 829        if (author_count < 1)
 830                err = report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
 831        else if (author_count > 1)
 832                err = report(options, &commit->object, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
 833        if (err)
 834                return err;
 835        if (!skip_prefix(buffer, "committer ", &buffer))
 836                return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
 837        err = fsck_ident(&buffer, &commit->object, options);
 838        if (err)
 839                return err;
 840        if (!get_commit_tree(commit)) {
 841                err = report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", oid_to_hex(&tree_oid));
 842                if (err)
 843                        return err;
 844        }
 845        if (memchr(buffer_begin, '\0', size)) {
 846                err = report(options, &commit->object, FSCK_MSG_NUL_IN_COMMIT,
 847                             "NUL byte in the commit object body");
 848                if (err)
 849                        return err;
 850        }
 851        return 0;
 852}
 853
 854static int fsck_commit(struct commit *commit, const char *data,
 855        unsigned long size, struct fsck_options *options)
 856{
 857        const char *buffer = data ?  data : get_commit_buffer(commit, &size);
 858        int ret = fsck_commit_buffer(commit, buffer, size, options);
 859        if (!data)
 860                unuse_commit_buffer(commit, buffer);
 861        return ret;
 862}
 863
 864static int fsck_tag_buffer(struct tag *tag, const char *data,
 865        unsigned long size, struct fsck_options *options)
 866{
 867        struct object_id oid;
 868        int ret = 0;
 869        const char *buffer;
 870        char *to_free = NULL, *eol;
 871        struct strbuf sb = STRBUF_INIT;
 872        const char *p;
 873
 874        if (data)
 875                buffer = data;
 876        else {
 877                enum object_type type;
 878
 879                buffer = to_free =
 880                        read_object_file(&tag->object.oid, &type, &size);
 881                if (!buffer)
 882                        return report(options, &tag->object,
 883                                FSCK_MSG_MISSING_TAG_OBJECT,
 884                                "cannot read tag object");
 885
 886                if (type != OBJ_TAG) {
 887                        ret = report(options, &tag->object,
 888                                FSCK_MSG_TAG_OBJECT_NOT_TAG,
 889                                "expected tag got %s",
 890                            type_name(type));
 891                        goto done;
 892                }
 893        }
 894
 895        ret = verify_headers(buffer, size, &tag->object, options);
 896        if (ret)
 897                goto done;
 898
 899        if (!skip_prefix(buffer, "object ", &buffer)) {
 900                ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
 901                goto done;
 902        }
 903        if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
 904                ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
 905                if (ret)
 906                        goto done;
 907        }
 908        buffer = p + 1;
 909
 910        if (!skip_prefix(buffer, "type ", &buffer)) {
 911                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
 912                goto done;
 913        }
 914        eol = strchr(buffer, '\n');
 915        if (!eol) {
 916                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
 917                goto done;
 918        }
 919        if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
 920                ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
 921        if (ret)
 922                goto done;
 923        buffer = eol + 1;
 924
 925        if (!skip_prefix(buffer, "tag ", &buffer)) {
 926                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
 927                goto done;
 928        }
 929        eol = strchr(buffer, '\n');
 930        if (!eol) {
 931                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
 932                goto done;
 933        }
 934        strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
 935        if (check_refname_format(sb.buf, 0)) {
 936                ret = report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
 937                           "invalid 'tag' name: %.*s",
 938                           (int)(eol - buffer), buffer);
 939                if (ret)
 940                        goto done;
 941        }
 942        buffer = eol + 1;
 943
 944        if (!skip_prefix(buffer, "tagger ", &buffer)) {
 945                /* early tags do not contain 'tagger' lines; warn only */
 946                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
 947                if (ret)
 948                        goto done;
 949        }
 950        else
 951                ret = fsck_ident(&buffer, &tag->object, options);
 952
 953done:
 954        strbuf_release(&sb);
 955        free(to_free);
 956        return ret;
 957}
 958
 959static int fsck_tag(struct tag *tag, const char *data,
 960        unsigned long size, struct fsck_options *options)
 961{
 962        struct object *tagged = tag->tagged;
 963
 964        if (!tagged)
 965                return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
 966
 967        return fsck_tag_buffer(tag, data, size, options);
 968}
 969
 970struct fsck_gitmodules_data {
 971        struct object *obj;
 972        struct fsck_options *options;
 973        int ret;
 974};
 975
 976static int fsck_gitmodules_fn(const char *var, const char *value, void *vdata)
 977{
 978        struct fsck_gitmodules_data *data = vdata;
 979        const char *subsection, *key;
 980        int subsection_len;
 981        char *name;
 982
 983        if (parse_config_key(var, "submodule", &subsection, &subsection_len, &key) < 0 ||
 984            !subsection)
 985                return 0;
 986
 987        name = xmemdupz(subsection, subsection_len);
 988        if (check_submodule_name(name) < 0)
 989                data->ret |= report(data->options, data->obj,
 990                                    FSCK_MSG_GITMODULES_NAME,
 991                                    "disallowed submodule name: %s",
 992                                    name);
 993        free(name);
 994
 995        return 0;
 996}
 997
 998static int fsck_blob(struct blob *blob, const char *buf,
 999                     unsigned long size, struct fsck_options *options)
1000{
1001        struct fsck_gitmodules_data data;
1002
1003        if (!oidset_contains(&gitmodules_found, &blob->object.oid))
1004                return 0;
1005        oidset_insert(&gitmodules_done, &blob->object.oid);
1006
1007        if (object_on_skiplist(options, &blob->object))
1008                return 0;
1009
1010        if (!buf) {
1011                /*
1012                 * A missing buffer here is a sign that the caller found the
1013                 * blob too gigantic to load into memory. Let's just consider
1014                 * that an error.
1015                 */
1016                return report(options, &blob->object,
1017                              FSCK_MSG_GITMODULES_PARSE,
1018                              ".gitmodules too large to parse");
1019        }
1020
1021        data.obj = &blob->object;
1022        data.options = options;
1023        data.ret = 0;
1024        if (git_config_from_mem(fsck_gitmodules_fn, CONFIG_ORIGIN_BLOB,
1025                                ".gitmodules", buf, size, &data))
1026                data.ret |= report(options, &blob->object,
1027                                   FSCK_MSG_GITMODULES_PARSE,
1028                                   "could not parse gitmodules blob");
1029
1030        return data.ret;
1031}
1032
1033int fsck_object(struct object *obj, void *data, unsigned long size,
1034        struct fsck_options *options)
1035{
1036        if (!obj)
1037                return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
1038
1039        if (obj->type == OBJ_BLOB)
1040                return fsck_blob((struct blob *)obj, data, size, options);
1041        if (obj->type == OBJ_TREE)
1042                return fsck_tree((struct tree *) obj, options);
1043        if (obj->type == OBJ_COMMIT)
1044                return fsck_commit((struct commit *) obj, (const char *) data,
1045                        size, options);
1046        if (obj->type == OBJ_TAG)
1047                return fsck_tag((struct tag *) obj, (const char *) data,
1048                        size, options);
1049
1050        return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
1051                          obj->type);
1052}
1053
1054int fsck_error_function(struct fsck_options *o,
1055        struct object *obj, int msg_type, const char *message)
1056{
1057        if (msg_type == FSCK_WARN) {
1058                warning("object %s: %s", describe_object(o, obj), message);
1059                return 0;
1060        }
1061        error("object %s: %s", describe_object(o, obj), message);
1062        return 1;
1063}
1064
1065int fsck_finish(struct fsck_options *options)
1066{
1067        int ret = 0;
1068        struct oidset_iter iter;
1069        const struct object_id *oid;
1070
1071        oidset_iter_init(&gitmodules_found, &iter);
1072        while ((oid = oidset_iter_next(&iter))) {
1073                struct blob *blob;
1074                enum object_type type;
1075                unsigned long size;
1076                char *buf;
1077
1078                if (oidset_contains(&gitmodules_done, oid))
1079                        continue;
1080
1081                blob = lookup_blob(oid);
1082                if (!blob) {
1083                        struct object *obj = lookup_unknown_object(oid->hash);
1084                        ret |= report(options, obj,
1085                                      FSCK_MSG_GITMODULES_BLOB,
1086                                      "non-blob found at .gitmodules");
1087                        continue;
1088                }
1089
1090                buf = read_object_file(oid, &type, &size);
1091                if (!buf) {
1092                        if (is_promisor_object(&blob->object.oid))
1093                                continue;
1094                        ret |= report(options, &blob->object,
1095                                      FSCK_MSG_GITMODULES_MISSING,
1096                                      "unable to read .gitmodules blob");
1097                        continue;
1098                }
1099
1100                if (type == OBJ_BLOB)
1101                        ret |= fsck_blob(blob, buf, size, options);
1102                else
1103                        ret |= report(options, &blob->object,
1104                                      FSCK_MSG_GITMODULES_BLOB,
1105                                      "non-blob found at .gitmodules");
1106                free(buf);
1107        }
1108
1109
1110        oidset_clear(&gitmodules_found);
1111        oidset_clear(&gitmodules_done);
1112        return ret;
1113}