Andrew's git - gitweb.git/blob

878a3c617c5019038c04919c697484ad9e291d9a
   1#include "cache.h"
   2#include "object.h"
   3#include "blob.h"
   4#include "tree.h"
   5#include "tree-walk.h"
   6#include "commit.h"
   7#include "tag.h"
   8#include "fsck.h"
   9#include "refs.h"
  10#include "utf8.h"
  11#include "sha1-array.h"
  12#include "decorate.h"
  13#include "help.h"
  14
  15#define FSCK_FATAL -1
  16#define FSCK_INFO -2
  17
  18#define FOREACH_MSG_ID(FUNC) \
  19        /* fatal errors */ \
  20        FUNC(NUL_IN_HEADER, FATAL) \
  21        FUNC(UNTERMINATED_HEADER, FATAL) \
  22        /* errors */ \
  23        FUNC(BAD_DATE, ERROR) \
  24        FUNC(BAD_DATE_OVERFLOW, ERROR) \
  25        FUNC(BAD_EMAIL, ERROR) \
  26        FUNC(BAD_NAME, ERROR) \
  27        FUNC(BAD_OBJECT_SHA1, ERROR) \
  28        FUNC(BAD_PARENT_SHA1, ERROR) \
  29        FUNC(BAD_TAG_OBJECT, ERROR) \
  30        FUNC(BAD_TIMEZONE, ERROR) \
  31        FUNC(BAD_TREE, ERROR) \
  32        FUNC(BAD_TREE_SHA1, ERROR) \
  33        FUNC(BAD_TYPE, ERROR) \
  34        FUNC(DUPLICATE_ENTRIES, ERROR) \
  35        FUNC(MISSING_AUTHOR, ERROR) \
  36        FUNC(MISSING_COMMITTER, ERROR) \
  37        FUNC(MISSING_EMAIL, ERROR) \
  38        FUNC(MISSING_GRAFT, ERROR) \
  39        FUNC(MISSING_NAME_BEFORE_EMAIL, ERROR) \
  40        FUNC(MISSING_OBJECT, ERROR) \
  41        FUNC(MISSING_PARENT, ERROR) \
  42        FUNC(MISSING_SPACE_BEFORE_DATE, ERROR) \
  43        FUNC(MISSING_SPACE_BEFORE_EMAIL, ERROR) \
  44        FUNC(MISSING_TAG, ERROR) \
  45        FUNC(MISSING_TAG_ENTRY, ERROR) \
  46        FUNC(MISSING_TAG_OBJECT, ERROR) \
  47        FUNC(MISSING_TREE, ERROR) \
  48        FUNC(MISSING_TYPE, ERROR) \
  49        FUNC(MISSING_TYPE_ENTRY, ERROR) \
  50        FUNC(MULTIPLE_AUTHORS, ERROR) \
  51        FUNC(TAG_OBJECT_NOT_TAG, ERROR) \
  52        FUNC(TREE_NOT_SORTED, ERROR) \
  53        FUNC(UNKNOWN_TYPE, ERROR) \
  54        FUNC(ZERO_PADDED_DATE, ERROR) \
  55        /* warnings */ \
  56        FUNC(BAD_FILEMODE, WARN) \
  57        FUNC(EMPTY_NAME, WARN) \
  58        FUNC(FULL_PATHNAME, WARN) \
  59        FUNC(HAS_DOT, WARN) \
  60        FUNC(HAS_DOTDOT, WARN) \
  61        FUNC(HAS_DOTGIT, WARN) \
  62        FUNC(NULL_SHA1, WARN) \
  63        FUNC(ZERO_PADDED_FILEMODE, WARN) \
  64        FUNC(NUL_IN_COMMIT, WARN) \
  65        /* infos (reported as warnings, but ignored by default) */ \
  66        FUNC(BAD_TAG_NAME, INFO) \
  67        FUNC(MISSING_TAGGER_ENTRY, INFO)
  68
  69#define MSG_ID(id, msg_type) FSCK_MSG_##id,
  70enum fsck_msg_id {
  71        FOREACH_MSG_ID(MSG_ID)
  72        FSCK_MSG_MAX
  73};
  74#undef MSG_ID
  75
  76#define STR(x) #x
  77#define MSG_ID(id, msg_type) { STR(id), NULL, FSCK_##msg_type },
  78static struct {
  79        const char *id_string;
  80        const char *downcased;
  81        int msg_type;
  82} msg_id_info[FSCK_MSG_MAX + 1] = {
  83        FOREACH_MSG_ID(MSG_ID)
  84        { NULL, NULL, -1 }
  85};
  86#undef MSG_ID
  87
  88static void prepare_msg_ids(void)
  89{
  90        int i;
  91
  92        if (msg_id_info[0].downcased)
  93                return;
  94
  95        /* convert id_string to lower case, without underscores. */
  96        for (i = 0; i < FSCK_MSG_MAX; i++) {
  97                const char *p = msg_id_info[i].id_string;
  98                int len = strlen(p);
  99                char *q = xmalloc(len);
 100
 101                msg_id_info[i].downcased = q;
 102                while (*p)
 103                        if (*p == '_')
 104                                p++;
 105                        else
 106                                *(q)++ = tolower(*(p)++);
 107                *q = '\0';
 108        }
 109}
 110
 111static int parse_msg_id(const char *text)
 112{
 113        int i;
 114
 115        prepare_msg_ids();
 116
 117        for (i = 0; i < FSCK_MSG_MAX; i++)
 118                if (!strcmp(text, msg_id_info[i].downcased))
 119                        return i;
 120
 121        return -1;
 122}
 123
 124void list_config_fsck_msg_ids(struct string_list *list, const char *prefix)
 125{
 126        int i;
 127
 128        prepare_msg_ids();
 129
 130        /* TODO: we can do better by producing camelCase names */
 131        for (i = 0; i < FSCK_MSG_MAX; i++)
 132                list_config_item(list, prefix, msg_id_info[i].downcased);
 133}
 134
 135static int fsck_msg_type(enum fsck_msg_id msg_id,
 136        struct fsck_options *options)
 137{
 138        int msg_type;
 139
 140        assert(msg_id >= 0 && msg_id < FSCK_MSG_MAX);
 141
 142        if (options->msg_type)
 143                msg_type = options->msg_type[msg_id];
 144        else {
 145                msg_type = msg_id_info[msg_id].msg_type;
 146                if (options->strict && msg_type == FSCK_WARN)
 147                        msg_type = FSCK_ERROR;
 148        }
 149
 150        return msg_type;
 151}
 152
 153static void init_skiplist(struct fsck_options *options, const char *path)
 154{
 155        static struct oid_array skiplist = OID_ARRAY_INIT;
 156        int sorted, fd;
 157        char buffer[GIT_MAX_HEXSZ + 1];
 158        struct object_id oid;
 159
 160        if (options->skiplist)
 161                sorted = options->skiplist->sorted;
 162        else {
 163                sorted = 1;
 164                options->skiplist = &skiplist;
 165        }
 166
 167        fd = open(path, O_RDONLY);
 168        if (fd < 0)
 169                die("Could not open skip list: %s", path);
 170        for (;;) {
 171                const char *p;
 172                int result = read_in_full(fd, buffer, sizeof(buffer));
 173                if (result < 0)
 174                        die_errno("Could not read '%s'", path);
 175                if (!result)
 176                        break;
 177                if (parse_oid_hex(buffer, &oid, &p) || *p != '\n')
 178                        die("Invalid SHA-1: %s", buffer);
 179                oid_array_append(&skiplist, &oid);
 180                if (sorted && skiplist.nr > 1 &&
 181                                oidcmp(&skiplist.oid[skiplist.nr - 2],
 182                                       &oid) > 0)
 183                        sorted = 0;
 184        }
 185        close(fd);
 186
 187        if (sorted)
 188                skiplist.sorted = 1;
 189}
 190
 191static int parse_msg_type(const char *str)
 192{
 193        if (!strcmp(str, "error"))
 194                return FSCK_ERROR;
 195        else if (!strcmp(str, "warn"))
 196                return FSCK_WARN;
 197        else if (!strcmp(str, "ignore"))
 198                return FSCK_IGNORE;
 199        else
 200                die("Unknown fsck message type: '%s'", str);
 201}
 202
 203int is_valid_msg_type(const char *msg_id, const char *msg_type)
 204{
 205        if (parse_msg_id(msg_id) < 0)
 206                return 0;
 207        parse_msg_type(msg_type);
 208        return 1;
 209}
 210
 211void fsck_set_msg_type(struct fsck_options *options,
 212                const char *msg_id, const char *msg_type)
 213{
 214        int id = parse_msg_id(msg_id), type;
 215
 216        if (id < 0)
 217                die("Unhandled message id: %s", msg_id);
 218        type = parse_msg_type(msg_type);
 219
 220        if (type != FSCK_ERROR && msg_id_info[id].msg_type == FSCK_FATAL)
 221                die("Cannot demote %s to %s", msg_id, msg_type);
 222
 223        if (!options->msg_type) {
 224                int i;
 225                int *msg_type;
 226                ALLOC_ARRAY(msg_type, FSCK_MSG_MAX);
 227                for (i = 0; i < FSCK_MSG_MAX; i++)
 228                        msg_type[i] = fsck_msg_type(i, options);
 229                options->msg_type = msg_type;
 230        }
 231
 232        options->msg_type[id] = type;
 233}
 234
 235void fsck_set_msg_types(struct fsck_options *options, const char *values)
 236{
 237        char *buf = xstrdup(values), *to_free = buf;
 238        int done = 0;
 239
 240        while (!done) {
 241                int len = strcspn(buf, " ,|"), equal;
 242
 243                done = !buf[len];
 244                if (!len) {
 245                        buf++;
 246                        continue;
 247                }
 248                buf[len] = '\0';
 249
 250                for (equal = 0;
 251                     equal < len && buf[equal] != '=' && buf[equal] != ':';
 252                     equal++)
 253                        buf[equal] = tolower(buf[equal]);
 254                buf[equal] = '\0';
 255
 256                if (!strcmp(buf, "skiplist")) {
 257                        if (equal == len)
 258                                die("skiplist requires a path");
 259                        init_skiplist(options, buf + equal + 1);
 260                        buf += len + 1;
 261                        continue;
 262                }
 263
 264                if (equal == len)
 265                        die("Missing '=': '%s'", buf);
 266
 267                fsck_set_msg_type(options, buf, buf + equal + 1);
 268                buf += len + 1;
 269        }
 270        free(to_free);
 271}
 272
 273static void append_msg_id(struct strbuf *sb, const char *msg_id)
 274{
 275        for (;;) {
 276                char c = *(msg_id)++;
 277
 278                if (!c)
 279                        break;
 280                if (c != '_')
 281                        strbuf_addch(sb, tolower(c));
 282                else {
 283                        assert(*msg_id);
 284                        strbuf_addch(sb, *(msg_id)++);
 285                }
 286        }
 287
 288        strbuf_addstr(sb, ": ");
 289}
 290
 291__attribute__((format (printf, 4, 5)))
 292static int report(struct fsck_options *options, struct object *object,
 293        enum fsck_msg_id id, const char *fmt, ...)
 294{
 295        va_list ap;
 296        struct strbuf sb = STRBUF_INIT;
 297        int msg_type = fsck_msg_type(id, options), result;
 298
 299        if (msg_type == FSCK_IGNORE)
 300                return 0;
 301
 302        if (options->skiplist && object &&
 303                        oid_array_lookup(options->skiplist, &object->oid) >= 0)
 304                return 0;
 305
 306        if (msg_type == FSCK_FATAL)
 307                msg_type = FSCK_ERROR;
 308        else if (msg_type == FSCK_INFO)
 309                msg_type = FSCK_WARN;
 310
 311        append_msg_id(&sb, msg_id_info[id].id_string);
 312
 313        va_start(ap, fmt);
 314        strbuf_vaddf(&sb, fmt, ap);
 315        result = options->error_func(options, object, msg_type, sb.buf);
 316        strbuf_release(&sb);
 317        va_end(ap);
 318
 319        return result;
 320}
 321
 322static char *get_object_name(struct fsck_options *options, struct object *obj)
 323{
 324        if (!options->object_names)
 325                return NULL;
 326        return lookup_decoration(options->object_names, obj);
 327}
 328
 329static void put_object_name(struct fsck_options *options, struct object *obj,
 330        const char *fmt, ...)
 331{
 332        va_list ap;
 333        struct strbuf buf = STRBUF_INIT;
 334        char *existing;
 335
 336        if (!options->object_names)
 337                return;
 338        existing = lookup_decoration(options->object_names, obj);
 339        if (existing)
 340                return;
 341        va_start(ap, fmt);
 342        strbuf_vaddf(&buf, fmt, ap);
 343        add_decoration(options->object_names, obj, strbuf_detach(&buf, NULL));
 344        va_end(ap);
 345}
 346
 347static const char *describe_object(struct fsck_options *o, struct object *obj)
 348{
 349        static struct strbuf buf = STRBUF_INIT;
 350        char *name;
 351
 352        strbuf_reset(&buf);
 353        strbuf_addstr(&buf, oid_to_hex(&obj->oid));
 354        if (o->object_names && (name = lookup_decoration(o->object_names, obj)))
 355                strbuf_addf(&buf, " (%s)", name);
 356
 357        return buf.buf;
 358}
 359
 360static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
 361{
 362        struct tree_desc desc;
 363        struct name_entry entry;
 364        int res = 0;
 365        const char *name;
 366
 367        if (parse_tree(tree))
 368                return -1;
 369
 370        name = get_object_name(options, &tree->object);
 371        if (init_tree_desc_gently(&desc, tree->buffer, tree->size))
 372                return -1;
 373        while (tree_entry_gently(&desc, &entry)) {
 374                struct object *obj;
 375                int result;
 376
 377                if (S_ISGITLINK(entry.mode))
 378                        continue;
 379
 380                if (S_ISDIR(entry.mode)) {
 381                        obj = (struct object *)lookup_tree(entry.oid);
 382                        if (name && obj)
 383                                put_object_name(options, obj, "%s%s/", name,
 384                                        entry.path);
 385                        result = options->walk(obj, OBJ_TREE, data, options);
 386                }
 387                else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
 388                        obj = (struct object *)lookup_blob(entry.oid);
 389                        if (name && obj)
 390                                put_object_name(options, obj, "%s%s", name,
 391                                        entry.path);
 392                        result = options->walk(obj, OBJ_BLOB, data, options);
 393                }
 394                else {
 395                        result = error("in tree %s: entry %s has bad mode %.6o",
 396                                        describe_object(options, &tree->object), entry.path, entry.mode);
 397                }
 398                if (result < 0)
 399                        return result;
 400                if (!res)
 401                        res = result;
 402        }
 403        return res;
 404}
 405
 406static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
 407{
 408        int counter = 0, generation = 0, name_prefix_len = 0;
 409        struct commit_list *parents;
 410        int res;
 411        int result;
 412        const char *name;
 413
 414        if (parse_commit(commit))
 415                return -1;
 416
 417        name = get_object_name(options, &commit->object);
 418        if (name)
 419                put_object_name(options, &get_commit_tree(commit)->object,
 420                                "%s:", name);
 421
 422        result = options->walk((struct object *)get_commit_tree(commit),
 423                               OBJ_TREE, data, options);
 424        if (result < 0)
 425                return result;
 426        res = result;
 427
 428        parents = commit->parents;
 429        if (name && parents) {
 430                int len = strlen(name), power;
 431
 432                if (len && name[len - 1] == '^') {
 433                        generation = 1;
 434                        name_prefix_len = len - 1;
 435                }
 436                else { /* parse ~<generation> suffix */
 437                        for (generation = 0, power = 1;
 438                             len && isdigit(name[len - 1]);
 439                             power *= 10)
 440                                generation += power * (name[--len] - '0');
 441                        if (power > 1 && len && name[len - 1] == '~')
 442                                name_prefix_len = len - 1;
 443                }
 444        }
 445
 446        while (parents) {
 447                if (name) {
 448                        struct object *obj = &parents->item->object;
 449
 450                        if (++counter > 1)
 451                                put_object_name(options, obj, "%s^%d",
 452                                        name, counter);
 453                        else if (generation > 0)
 454                                put_object_name(options, obj, "%.*s~%d",
 455                                        name_prefix_len, name, generation + 1);
 456                        else
 457                                put_object_name(options, obj, "%s^", name);
 458                }
 459                result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
 460                if (result < 0)
 461                        return result;
 462                if (!res)
 463                        res = result;
 464                parents = parents->next;
 465        }
 466        return res;
 467}
 468
 469static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
 470{
 471        char *name = get_object_name(options, &tag->object);
 472
 473        if (parse_tag(tag))
 474                return -1;
 475        if (name)
 476                put_object_name(options, tag->tagged, "%s", name);
 477        return options->walk(tag->tagged, OBJ_ANY, data, options);
 478}
 479
 480int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
 481{
 482        if (!obj)
 483                return -1;
 484
 485        if (obj->type == OBJ_NONE)
 486                parse_object(&obj->oid);
 487
 488        switch (obj->type) {
 489        case OBJ_BLOB:
 490                return 0;
 491        case OBJ_TREE:
 492                return fsck_walk_tree((struct tree *)obj, data, options);
 493        case OBJ_COMMIT:
 494                return fsck_walk_commit((struct commit *)obj, data, options);
 495        case OBJ_TAG:
 496                return fsck_walk_tag((struct tag *)obj, data, options);
 497        default:
 498                error("Unknown object type for %s", describe_object(options, obj));
 499                return -1;
 500        }
 501}
 502
 503/*
 504 * The entries in a tree are ordered in the _path_ order,
 505 * which means that a directory entry is ordered by adding
 506 * a slash to the end of it.
 507 *
 508 * So a directory called "a" is ordered _after_ a file
 509 * called "a.c", because "a/" sorts after "a.c".
 510 */
 511#define TREE_UNORDERED (-1)
 512#define TREE_HAS_DUPS  (-2)
 513
 514static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
 515{
 516        int len1 = strlen(name1);
 517        int len2 = strlen(name2);
 518        int len = len1 < len2 ? len1 : len2;
 519        unsigned char c1, c2;
 520        int cmp;
 521
 522        cmp = memcmp(name1, name2, len);
 523        if (cmp < 0)
 524                return 0;
 525        if (cmp > 0)
 526                return TREE_UNORDERED;
 527
 528        /*
 529         * Ok, the first <len> characters are the same.
 530         * Now we need to order the next one, but turn
 531         * a '\0' into a '/' for a directory entry.
 532         */
 533        c1 = name1[len];
 534        c2 = name2[len];
 535        if (!c1 && !c2)
 536                /*
 537                 * git-write-tree used to write out a nonsense tree that has
 538                 * entries with the same name, one blob and one tree.  Make
 539                 * sure we do not have duplicate entries.
 540                 */
 541                return TREE_HAS_DUPS;
 542        if (!c1 && S_ISDIR(mode1))
 543                c1 = '/';
 544        if (!c2 && S_ISDIR(mode2))
 545                c2 = '/';
 546        return c1 < c2 ? 0 : TREE_UNORDERED;
 547}
 548
 549static int fsck_tree(struct tree *item, struct fsck_options *options)
 550{
 551        int retval = 0;
 552        int has_null_sha1 = 0;
 553        int has_full_path = 0;
 554        int has_empty_name = 0;
 555        int has_dot = 0;
 556        int has_dotdot = 0;
 557        int has_dotgit = 0;
 558        int has_zero_pad = 0;
 559        int has_bad_modes = 0;
 560        int has_dup_entries = 0;
 561        int not_properly_sorted = 0;
 562        struct tree_desc desc;
 563        unsigned o_mode;
 564        const char *o_name;
 565
 566        if (init_tree_desc_gently(&desc, item->buffer, item->size)) {
 567                retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 568                return retval;
 569        }
 570
 571        o_mode = 0;
 572        o_name = NULL;
 573
 574        while (desc.size) {
 575                unsigned mode;
 576                const char *name;
 577                const struct object_id *oid;
 578
 579                oid = tree_entry_extract(&desc, &name, &mode);
 580
 581                has_null_sha1 |= is_null_oid(oid);
 582                has_full_path |= !!strchr(name, '/');
 583                has_empty_name |= !*name;
 584                has_dot |= !strcmp(name, ".");
 585                has_dotdot |= !strcmp(name, "..");
 586                has_dotgit |= (!strcmp(name, ".git") ||
 587                               is_hfs_dotgit(name) ||
 588                               is_ntfs_dotgit(name));
 589                has_zero_pad |= *(char *)desc.buffer == '0';
 590                if (update_tree_entry_gently(&desc)) {
 591                        retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 592                        break;
 593                }
 594
 595                switch (mode) {
 596                /*
 597                 * Standard modes..
 598                 */
 599                case S_IFREG | 0755:
 600                case S_IFREG | 0644:
 601                case S_IFLNK:
 602                case S_IFDIR:
 603                case S_IFGITLINK:
 604                        break;
 605                /*
 606                 * This is nonstandard, but we had a few of these
 607                 * early on when we honored the full set of mode
 608                 * bits..
 609                 */
 610                case S_IFREG | 0664:
 611                        if (!options->strict)
 612                                break;
 613                        /* fallthrough */
 614                default:
 615                        has_bad_modes = 1;
 616                }
 617
 618                if (o_name) {
 619                        switch (verify_ordered(o_mode, o_name, mode, name)) {
 620                        case TREE_UNORDERED:
 621                                not_properly_sorted = 1;
 622                                break;
 623                        case TREE_HAS_DUPS:
 624                                has_dup_entries = 1;
 625                                break;
 626                        default:
 627                                break;
 628                        }
 629                }
 630
 631                o_mode = mode;
 632                o_name = name;
 633        }
 634
 635        if (has_null_sha1)
 636                retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
 637        if (has_full_path)
 638                retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
 639        if (has_empty_name)
 640                retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
 641        if (has_dot)
 642                retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
 643        if (has_dotdot)
 644                retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
 645        if (has_dotgit)
 646                retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
 647        if (has_zero_pad)
 648                retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
 649        if (has_bad_modes)
 650                retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
 651        if (has_dup_entries)
 652                retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
 653        if (not_properly_sorted)
 654                retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
 655        return retval;
 656}
 657
 658static int verify_headers(const void *data, unsigned long size,
 659                          struct object *obj, struct fsck_options *options)
 660{
 661        const char *buffer = (const char *)data;
 662        unsigned long i;
 663
 664        for (i = 0; i < size; i++) {
 665                switch (buffer[i]) {
 666                case '\0':
 667                        return report(options, obj,
 668                                FSCK_MSG_NUL_IN_HEADER,
 669                                "unterminated header: NUL at offset %ld", i);
 670                case '\n':
 671                        if (i + 1 < size && buffer[i + 1] == '\n')
 672                                return 0;
 673                }
 674        }
 675
 676        /*
 677         * We did not find double-LF that separates the header
 678         * and the body.  Not having a body is not a crime but
 679         * we do want to see the terminating LF for the last header
 680         * line.
 681         */
 682        if (size && buffer[size - 1] == '\n')
 683                return 0;
 684
 685        return report(options, obj,
 686                FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
 687}
 688
 689static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
 690{
 691        const char *p = *ident;
 692        char *end;
 693
 694        *ident = strchrnul(*ident, '\n');
 695        if (**ident == '\n')
 696                (*ident)++;
 697
 698        if (*p == '<')
 699                return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 700        p += strcspn(p, "<>\n");
 701        if (*p == '>')
 702                return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
 703        if (*p != '<')
 704                return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
 705        if (p[-1] != ' ')
 706                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 707        p++;
 708        p += strcspn(p, "<>\n");
 709        if (*p != '>')
 710                return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
 711        p++;
 712        if (*p != ' ')
 713                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
 714        p++;
 715        if (*p == '0' && p[1] != ' ')
 716                return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
 717        if (date_overflows(parse_timestamp(p, &end, 10)))
 718                return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
 719        if ((end == p || *end != ' '))
 720                return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
 721        p = end + 1;
 722        if ((*p != '+' && *p != '-') ||
 723            !isdigit(p[1]) ||
 724            !isdigit(p[2]) ||
 725            !isdigit(p[3]) ||
 726            !isdigit(p[4]) ||
 727            (p[5] != '\n'))
 728                return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
 729        p += 6;
 730        return 0;
 731}
 732
 733static int fsck_commit_buffer(struct commit *commit, const char *buffer,
 734        unsigned long size, struct fsck_options *options)
 735{
 736        unsigned char tree_sha1[20], sha1[20];
 737        struct commit_graft *graft;
 738        unsigned parent_count, parent_line_count = 0, author_count;
 739        int err;
 740        const char *buffer_begin = buffer;
 741
 742        if (verify_headers(buffer, size, &commit->object, options))
 743                return -1;
 744
 745        if (!skip_prefix(buffer, "tree ", &buffer))
 746                return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
 747        if (get_sha1_hex(buffer, tree_sha1) || buffer[40] != '\n') {
 748                err = report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
 749                if (err)
 750                        return err;
 751        }
 752        buffer += 41;
 753        while (skip_prefix(buffer, "parent ", &buffer)) {
 754                if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
 755                        err = report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
 756                        if (err)
 757                                return err;
 758                }
 759                buffer += 41;
 760                parent_line_count++;
 761        }
 762        graft = lookup_commit_graft(&commit->object.oid);
 763        parent_count = commit_list_count(commit->parents);
 764        if (graft) {
 765                if (graft->nr_parent == -1 && !parent_count)
 766                        ; /* shallow commit */
 767                else if (graft->nr_parent != parent_count) {
 768                        err = report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
 769                        if (err)
 770                                return err;
 771                }
 772        } else {
 773                if (parent_count != parent_line_count) {
 774                        err = report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
 775                        if (err)
 776                                return err;
 777                }
 778        }
 779        author_count = 0;
 780        while (skip_prefix(buffer, "author ", &buffer)) {
 781                author_count++;
 782                err = fsck_ident(&buffer, &commit->object, options);
 783                if (err)
 784                        return err;
 785        }
 786        if (author_count < 1)
 787                err = report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
 788        else if (author_count > 1)
 789                err = report(options, &commit->object, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
 790        if (err)
 791                return err;
 792        if (!skip_prefix(buffer, "committer ", &buffer))
 793                return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
 794        err = fsck_ident(&buffer, &commit->object, options);
 795        if (err)
 796                return err;
 797        if (!get_commit_tree(commit)) {
 798                err = report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
 799                if (err)
 800                        return err;
 801        }
 802        if (memchr(buffer_begin, '\0', size)) {
 803                err = report(options, &commit->object, FSCK_MSG_NUL_IN_COMMIT,
 804                             "NUL byte in the commit object body");
 805                if (err)
 806                        return err;
 807        }
 808        return 0;
 809}
 810
 811static int fsck_commit(struct commit *commit, const char *data,
 812        unsigned long size, struct fsck_options *options)
 813{
 814        const char *buffer = data ?  data : get_commit_buffer(commit, &size);
 815        int ret = fsck_commit_buffer(commit, buffer, size, options);
 816        if (!data)
 817                unuse_commit_buffer(commit, buffer);
 818        return ret;
 819}
 820
 821static int fsck_tag_buffer(struct tag *tag, const char *data,
 822        unsigned long size, struct fsck_options *options)
 823{
 824        unsigned char sha1[20];
 825        int ret = 0;
 826        const char *buffer;
 827        char *to_free = NULL, *eol;
 828        struct strbuf sb = STRBUF_INIT;
 829
 830        if (data)
 831                buffer = data;
 832        else {
 833                enum object_type type;
 834
 835                buffer = to_free =
 836                        read_object_file(&tag->object.oid, &type, &size);
 837                if (!buffer)
 838                        return report(options, &tag->object,
 839                                FSCK_MSG_MISSING_TAG_OBJECT,
 840                                "cannot read tag object");
 841
 842                if (type != OBJ_TAG) {
 843                        ret = report(options, &tag->object,
 844                                FSCK_MSG_TAG_OBJECT_NOT_TAG,
 845                                "expected tag got %s",
 846                            type_name(type));
 847                        goto done;
 848                }
 849        }
 850
 851        ret = verify_headers(buffer, size, &tag->object, options);
 852        if (ret)
 853                goto done;
 854
 855        if (!skip_prefix(buffer, "object ", &buffer)) {
 856                ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
 857                goto done;
 858        }
 859        if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
 860                ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
 861                if (ret)
 862                        goto done;
 863        }
 864        buffer += 41;
 865
 866        if (!skip_prefix(buffer, "type ", &buffer)) {
 867                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
 868                goto done;
 869        }
 870        eol = strchr(buffer, '\n');
 871        if (!eol) {
 872                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
 873                goto done;
 874        }
 875        if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
 876                ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
 877        if (ret)
 878                goto done;
 879        buffer = eol + 1;
 880
 881        if (!skip_prefix(buffer, "tag ", &buffer)) {
 882                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
 883                goto done;
 884        }
 885        eol = strchr(buffer, '\n');
 886        if (!eol) {
 887                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
 888                goto done;
 889        }
 890        strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
 891        if (check_refname_format(sb.buf, 0)) {
 892                ret = report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
 893                           "invalid 'tag' name: %.*s",
 894                           (int)(eol - buffer), buffer);
 895                if (ret)
 896                        goto done;
 897        }
 898        buffer = eol + 1;
 899
 900        if (!skip_prefix(buffer, "tagger ", &buffer)) {
 901                /* early tags do not contain 'tagger' lines; warn only */
 902                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
 903                if (ret)
 904                        goto done;
 905        }
 906        else
 907                ret = fsck_ident(&buffer, &tag->object, options);
 908
 909done:
 910        strbuf_release(&sb);
 911        free(to_free);
 912        return ret;
 913}
 914
 915static int fsck_tag(struct tag *tag, const char *data,
 916        unsigned long size, struct fsck_options *options)
 917{
 918        struct object *tagged = tag->tagged;
 919
 920        if (!tagged)
 921                return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
 922
 923        return fsck_tag_buffer(tag, data, size, options);
 924}
 925
 926int fsck_object(struct object *obj, void *data, unsigned long size,
 927        struct fsck_options *options)
 928{
 929        if (!obj)
 930                return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
 931
 932        if (obj->type == OBJ_BLOB)
 933                return 0;
 934        if (obj->type == OBJ_TREE)
 935                return fsck_tree((struct tree *) obj, options);
 936        if (obj->type == OBJ_COMMIT)
 937                return fsck_commit((struct commit *) obj, (const char *) data,
 938                        size, options);
 939        if (obj->type == OBJ_TAG)
 940                return fsck_tag((struct tag *) obj, (const char *) data,
 941                        size, options);
 942
 943        return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
 944                          obj->type);
 945}
 946
 947int fsck_error_function(struct fsck_options *o,
 948        struct object *obj, int msg_type, const char *message)
 949{
 950        if (msg_type == FSCK_WARN) {
 951                warning("object %s: %s", describe_object(o, obj), message);
 952                return 0;
 953        }
 954        error("object %s: %s", describe_object(o, obj), message);
 955        return 1;
 956}