Andrew's git - gitweb.git/blob

d3d81fcc12f5852acb6e35fb355cdc0770194efd
   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
  12#define FOREACH_MSG_ID(FUNC) \
  13        /* errors */ \
  14        FUNC(BAD_DATE, ERROR) \
  15        FUNC(BAD_DATE_OVERFLOW, ERROR) \
  16        FUNC(BAD_EMAIL, ERROR) \
  17        FUNC(BAD_NAME, ERROR) \
  18        FUNC(BAD_OBJECT_SHA1, ERROR) \
  19        FUNC(BAD_PARENT_SHA1, ERROR) \
  20        FUNC(BAD_TAG_OBJECT, ERROR) \
  21        FUNC(BAD_TIMEZONE, ERROR) \
  22        FUNC(BAD_TREE, ERROR) \
  23        FUNC(BAD_TREE_SHA1, ERROR) \
  24        FUNC(BAD_TYPE, ERROR) \
  25        FUNC(DUPLICATE_ENTRIES, ERROR) \
  26        FUNC(MISSING_AUTHOR, ERROR) \
  27        FUNC(MISSING_COMMITTER, ERROR) \
  28        FUNC(MISSING_EMAIL, ERROR) \
  29        FUNC(MISSING_GRAFT, ERROR) \
  30        FUNC(MISSING_NAME_BEFORE_EMAIL, ERROR) \
  31        FUNC(MISSING_OBJECT, ERROR) \
  32        FUNC(MISSING_PARENT, ERROR) \
  33        FUNC(MISSING_SPACE_BEFORE_DATE, ERROR) \
  34        FUNC(MISSING_SPACE_BEFORE_EMAIL, ERROR) \
  35        FUNC(MISSING_TAG, ERROR) \
  36        FUNC(MISSING_TAG_ENTRY, ERROR) \
  37        FUNC(MISSING_TAG_OBJECT, ERROR) \
  38        FUNC(MISSING_TREE, ERROR) \
  39        FUNC(MISSING_TYPE, ERROR) \
  40        FUNC(MISSING_TYPE_ENTRY, ERROR) \
  41        FUNC(NUL_IN_HEADER, ERROR) \
  42        FUNC(TAG_OBJECT_NOT_TAG, ERROR) \
  43        FUNC(TREE_NOT_SORTED, ERROR) \
  44        FUNC(UNKNOWN_TYPE, ERROR) \
  45        FUNC(UNTERMINATED_HEADER, ERROR) \
  46        FUNC(ZERO_PADDED_DATE, ERROR) \
  47        /* warnings */ \
  48        FUNC(BAD_FILEMODE, WARN) \
  49        FUNC(BAD_TAG_NAME, WARN) \
  50        FUNC(EMPTY_NAME, WARN) \
  51        FUNC(FULL_PATHNAME, WARN) \
  52        FUNC(HAS_DOT, WARN) \
  53        FUNC(HAS_DOTDOT, WARN) \
  54        FUNC(HAS_DOTGIT, WARN) \
  55        FUNC(MISSING_TAGGER_ENTRY, WARN) \
  56        FUNC(NULL_SHA1, WARN) \
  57        FUNC(ZERO_PADDED_FILEMODE, WARN)
  58
  59#define MSG_ID(id, msg_type) FSCK_MSG_##id,
  60enum fsck_msg_id {
  61        FOREACH_MSG_ID(MSG_ID)
  62        FSCK_MSG_MAX
  63};
  64#undef MSG_ID
  65
  66#define STR(x) #x
  67#define MSG_ID(id, msg_type) { STR(id), NULL, FSCK_##msg_type },
  68static struct {
  69        const char *id_string;
  70        const char *downcased;
  71        int msg_type;
  72} msg_id_info[FSCK_MSG_MAX + 1] = {
  73        FOREACH_MSG_ID(MSG_ID)
  74        { NULL, NULL, -1 }
  75};
  76#undef MSG_ID
  77
  78static int parse_msg_id(const char *text)
  79{
  80        int i;
  81
  82        if (!msg_id_info[0].downcased) {
  83                /* convert id_string to lower case, without underscores. */
  84                for (i = 0; i < FSCK_MSG_MAX; i++) {
  85                        const char *p = msg_id_info[i].id_string;
  86                        int len = strlen(p);
  87                        char *q = xmalloc(len);
  88
  89                        msg_id_info[i].downcased = q;
  90                        while (*p)
  91                                if (*p == '_')
  92                                        p++;
  93                                else
  94                                        *(q)++ = tolower(*(p)++);
  95                        *q = '\0';
  96                }
  97        }
  98
  99        for (i = 0; i < FSCK_MSG_MAX; i++)
 100                if (!strcmp(text, msg_id_info[i].downcased))
 101                        return i;
 102
 103        return -1;
 104}
 105
 106static int fsck_msg_type(enum fsck_msg_id msg_id,
 107        struct fsck_options *options)
 108{
 109        int msg_type;
 110
 111        assert(msg_id >= 0 && msg_id < FSCK_MSG_MAX);
 112
 113        if (options->msg_type)
 114                msg_type = options->msg_type[msg_id];
 115        else {
 116                msg_type = msg_id_info[msg_id].msg_type;
 117                if (options->strict && msg_type == FSCK_WARN)
 118                        msg_type = FSCK_ERROR;
 119        }
 120
 121        return msg_type;
 122}
 123
 124static int parse_msg_type(const char *str)
 125{
 126        if (!strcmp(str, "error"))
 127                return FSCK_ERROR;
 128        else if (!strcmp(str, "warn"))
 129                return FSCK_WARN;
 130        else
 131                die("Unknown fsck message type: '%s'", str);
 132}
 133
 134int is_valid_msg_type(const char *msg_id, const char *msg_type)
 135{
 136        if (parse_msg_id(msg_id) < 0)
 137                return 0;
 138        parse_msg_type(msg_type);
 139        return 1;
 140}
 141
 142void fsck_set_msg_type(struct fsck_options *options,
 143                const char *msg_id, const char *msg_type)
 144{
 145        int id = parse_msg_id(msg_id), type;
 146
 147        if (id < 0)
 148                die("Unhandled message id: %s", msg_id);
 149        type = parse_msg_type(msg_type);
 150
 151        if (!options->msg_type) {
 152                int i;
 153                int *msg_type = xmalloc(sizeof(int) * FSCK_MSG_MAX);
 154                for (i = 0; i < FSCK_MSG_MAX; i++)
 155                        msg_type[i] = fsck_msg_type(i, options);
 156                options->msg_type = msg_type;
 157        }
 158
 159        options->msg_type[id] = type;
 160}
 161
 162void fsck_set_msg_types(struct fsck_options *options, const char *values)
 163{
 164        char *buf = xstrdup(values), *to_free = buf;
 165        int done = 0;
 166
 167        while (!done) {
 168                int len = strcspn(buf, " ,|"), equal;
 169
 170                done = !buf[len];
 171                if (!len) {
 172                        buf++;
 173                        continue;
 174                }
 175                buf[len] = '\0';
 176
 177                for (equal = 0;
 178                     equal < len && buf[equal] != '=' && buf[equal] != ':';
 179                     equal++)
 180                        buf[equal] = tolower(buf[equal]);
 181                buf[equal] = '\0';
 182
 183                if (equal == len)
 184                        die("Missing '=': '%s'", buf);
 185
 186                fsck_set_msg_type(options, buf, buf + equal + 1);
 187                buf += len + 1;
 188        }
 189        free(to_free);
 190}
 191
 192static void append_msg_id(struct strbuf *sb, const char *msg_id)
 193{
 194        for (;;) {
 195                char c = *(msg_id)++;
 196
 197                if (!c)
 198                        break;
 199                if (c != '_')
 200                        strbuf_addch(sb, tolower(c));
 201                else {
 202                        assert(*msg_id);
 203                        strbuf_addch(sb, *(msg_id)++);
 204                }
 205        }
 206
 207        strbuf_addstr(sb, ": ");
 208}
 209
 210__attribute__((format (printf, 4, 5)))
 211static int report(struct fsck_options *options, struct object *object,
 212        enum fsck_msg_id id, const char *fmt, ...)
 213{
 214        va_list ap;
 215        struct strbuf sb = STRBUF_INIT;
 216        int msg_type = fsck_msg_type(id, options), result;
 217
 218        append_msg_id(&sb, msg_id_info[id].id_string);
 219
 220        va_start(ap, fmt);
 221        strbuf_vaddf(&sb, fmt, ap);
 222        result = options->error_func(object, msg_type, sb.buf);
 223        strbuf_release(&sb);
 224        va_end(ap);
 225
 226        return result;
 227}
 228
 229static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
 230{
 231        struct tree_desc desc;
 232        struct name_entry entry;
 233        int res = 0;
 234
 235        if (parse_tree(tree))
 236                return -1;
 237
 238        init_tree_desc(&desc, tree->buffer, tree->size);
 239        while (tree_entry(&desc, &entry)) {
 240                int result;
 241
 242                if (S_ISGITLINK(entry.mode))
 243                        continue;
 244                if (S_ISDIR(entry.mode))
 245                        result = options->walk(&lookup_tree(entry.sha1)->object, OBJ_TREE, data, options);
 246                else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode))
 247                        result = options->walk(&lookup_blob(entry.sha1)->object, OBJ_BLOB, data, options);
 248                else {
 249                        result = error("in tree %s: entry %s has bad mode %.6o",
 250                                        sha1_to_hex(tree->object.sha1), entry.path, entry.mode);
 251                }
 252                if (result < 0)
 253                        return result;
 254                if (!res)
 255                        res = result;
 256        }
 257        return res;
 258}
 259
 260static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
 261{
 262        struct commit_list *parents;
 263        int res;
 264        int result;
 265
 266        if (parse_commit(commit))
 267                return -1;
 268
 269        result = options->walk((struct object *)commit->tree, OBJ_TREE, data, options);
 270        if (result < 0)
 271                return result;
 272        res = result;
 273
 274        parents = commit->parents;
 275        while (parents) {
 276                result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
 277                if (result < 0)
 278                        return result;
 279                if (!res)
 280                        res = result;
 281                parents = parents->next;
 282        }
 283        return res;
 284}
 285
 286static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
 287{
 288        if (parse_tag(tag))
 289                return -1;
 290        return options->walk(tag->tagged, OBJ_ANY, data, options);
 291}
 292
 293int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
 294{
 295        if (!obj)
 296                return -1;
 297        switch (obj->type) {
 298        case OBJ_BLOB:
 299                return 0;
 300        case OBJ_TREE:
 301                return fsck_walk_tree((struct tree *)obj, data, options);
 302        case OBJ_COMMIT:
 303                return fsck_walk_commit((struct commit *)obj, data, options);
 304        case OBJ_TAG:
 305                return fsck_walk_tag((struct tag *)obj, data, options);
 306        default:
 307                error("Unknown object type for %s", sha1_to_hex(obj->sha1));
 308                return -1;
 309        }
 310}
 311
 312/*
 313 * The entries in a tree are ordered in the _path_ order,
 314 * which means that a directory entry is ordered by adding
 315 * a slash to the end of it.
 316 *
 317 * So a directory called "a" is ordered _after_ a file
 318 * called "a.c", because "a/" sorts after "a.c".
 319 */
 320#define TREE_UNORDERED (-1)
 321#define TREE_HAS_DUPS  (-2)
 322
 323static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
 324{
 325        int len1 = strlen(name1);
 326        int len2 = strlen(name2);
 327        int len = len1 < len2 ? len1 : len2;
 328        unsigned char c1, c2;
 329        int cmp;
 330
 331        cmp = memcmp(name1, name2, len);
 332        if (cmp < 0)
 333                return 0;
 334        if (cmp > 0)
 335                return TREE_UNORDERED;
 336
 337        /*
 338         * Ok, the first <len> characters are the same.
 339         * Now we need to order the next one, but turn
 340         * a '\0' into a '/' for a directory entry.
 341         */
 342        c1 = name1[len];
 343        c2 = name2[len];
 344        if (!c1 && !c2)
 345                /*
 346                 * git-write-tree used to write out a nonsense tree that has
 347                 * entries with the same name, one blob and one tree.  Make
 348                 * sure we do not have duplicate entries.
 349                 */
 350                return TREE_HAS_DUPS;
 351        if (!c1 && S_ISDIR(mode1))
 352                c1 = '/';
 353        if (!c2 && S_ISDIR(mode2))
 354                c2 = '/';
 355        return c1 < c2 ? 0 : TREE_UNORDERED;
 356}
 357
 358static int fsck_tree(struct tree *item, struct fsck_options *options)
 359{
 360        int retval;
 361        int has_null_sha1 = 0;
 362        int has_full_path = 0;
 363        int has_empty_name = 0;
 364        int has_dot = 0;
 365        int has_dotdot = 0;
 366        int has_dotgit = 0;
 367        int has_zero_pad = 0;
 368        int has_bad_modes = 0;
 369        int has_dup_entries = 0;
 370        int not_properly_sorted = 0;
 371        struct tree_desc desc;
 372        unsigned o_mode;
 373        const char *o_name;
 374
 375        init_tree_desc(&desc, item->buffer, item->size);
 376
 377        o_mode = 0;
 378        o_name = NULL;
 379
 380        while (desc.size) {
 381                unsigned mode;
 382                const char *name;
 383                const unsigned char *sha1;
 384
 385                sha1 = tree_entry_extract(&desc, &name, &mode);
 386
 387                has_null_sha1 |= is_null_sha1(sha1);
 388                has_full_path |= !!strchr(name, '/');
 389                has_empty_name |= !*name;
 390                has_dot |= !strcmp(name, ".");
 391                has_dotdot |= !strcmp(name, "..");
 392                has_dotgit |= (!strcmp(name, ".git") ||
 393                               is_hfs_dotgit(name) ||
 394                               is_ntfs_dotgit(name));
 395                has_zero_pad |= *(char *)desc.buffer == '0';
 396                update_tree_entry(&desc);
 397
 398                switch (mode) {
 399                /*
 400                 * Standard modes..
 401                 */
 402                case S_IFREG | 0755:
 403                case S_IFREG | 0644:
 404                case S_IFLNK:
 405                case S_IFDIR:
 406                case S_IFGITLINK:
 407                        break;
 408                /*
 409                 * This is nonstandard, but we had a few of these
 410                 * early on when we honored the full set of mode
 411                 * bits..
 412                 */
 413                case S_IFREG | 0664:
 414                        if (!options->strict)
 415                                break;
 416                default:
 417                        has_bad_modes = 1;
 418                }
 419
 420                if (o_name) {
 421                        switch (verify_ordered(o_mode, o_name, mode, name)) {
 422                        case TREE_UNORDERED:
 423                                not_properly_sorted = 1;
 424                                break;
 425                        case TREE_HAS_DUPS:
 426                                has_dup_entries = 1;
 427                                break;
 428                        default:
 429                                break;
 430                        }
 431                }
 432
 433                o_mode = mode;
 434                o_name = name;
 435        }
 436
 437        retval = 0;
 438        if (has_null_sha1)
 439                retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
 440        if (has_full_path)
 441                retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
 442        if (has_empty_name)
 443                retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
 444        if (has_dot)
 445                retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
 446        if (has_dotdot)
 447                retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
 448        if (has_dotgit)
 449                retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
 450        if (has_zero_pad)
 451                retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
 452        if (has_bad_modes)
 453                retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
 454        if (has_dup_entries)
 455                retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
 456        if (not_properly_sorted)
 457                retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
 458        return retval;
 459}
 460
 461static int require_end_of_header(const void *data, unsigned long size,
 462        struct object *obj, struct fsck_options *options)
 463{
 464        const char *buffer = (const char *)data;
 465        unsigned long i;
 466
 467        for (i = 0; i < size; i++) {
 468                switch (buffer[i]) {
 469                case '\0':
 470                        return report(options, obj,
 471                                FSCK_MSG_NUL_IN_HEADER,
 472                                "unterminated header: NUL at offset %ld", i);
 473                case '\n':
 474                        if (i + 1 < size && buffer[i + 1] == '\n')
 475                                return 0;
 476                }
 477        }
 478
 479        return report(options, obj,
 480                FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
 481}
 482
 483static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
 484{
 485        const char *p = *ident;
 486        char *end;
 487
 488        *ident = strchrnul(*ident, '\n');
 489        if (**ident == '\n')
 490                (*ident)++;
 491
 492        if (*p == '<')
 493                return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 494        p += strcspn(p, "<>\n");
 495        if (*p == '>')
 496                return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
 497        if (*p != '<')
 498                return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
 499        if (p[-1] != ' ')
 500                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 501        p++;
 502        p += strcspn(p, "<>\n");
 503        if (*p != '>')
 504                return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
 505        p++;
 506        if (*p != ' ')
 507                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
 508        p++;
 509        if (*p == '0' && p[1] != ' ')
 510                return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
 511        if (date_overflows(strtoul(p, &end, 10)))
 512                return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
 513        if ((end == p || *end != ' '))
 514                return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
 515        p = end + 1;
 516        if ((*p != '+' && *p != '-') ||
 517            !isdigit(p[1]) ||
 518            !isdigit(p[2]) ||
 519            !isdigit(p[3]) ||
 520            !isdigit(p[4]) ||
 521            (p[5] != '\n'))
 522                return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
 523        p += 6;
 524        return 0;
 525}
 526
 527static int fsck_commit_buffer(struct commit *commit, const char *buffer,
 528        unsigned long size, struct fsck_options *options)
 529{
 530        unsigned char tree_sha1[20], sha1[20];
 531        struct commit_graft *graft;
 532        unsigned parent_count, parent_line_count = 0;
 533        int err;
 534
 535        if (require_end_of_header(buffer, size, &commit->object, options))
 536                return -1;
 537
 538        if (!skip_prefix(buffer, "tree ", &buffer))
 539                return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
 540        if (get_sha1_hex(buffer, tree_sha1) || buffer[40] != '\n') {
 541                err = report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
 542                if (err)
 543                        return err;
 544        }
 545        buffer += 41;
 546        while (skip_prefix(buffer, "parent ", &buffer)) {
 547                if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
 548                        err = report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
 549                        if (err)
 550                                return err;
 551                }
 552                buffer += 41;
 553                parent_line_count++;
 554        }
 555        graft = lookup_commit_graft(commit->object.sha1);
 556        parent_count = commit_list_count(commit->parents);
 557        if (graft) {
 558                if (graft->nr_parent == -1 && !parent_count)
 559                        ; /* shallow commit */
 560                else if (graft->nr_parent != parent_count) {
 561                        err = report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
 562                        if (err)
 563                                return err;
 564                }
 565        } else {
 566                if (parent_count != parent_line_count) {
 567                        err = report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
 568                        if (err)
 569                                return err;
 570                }
 571        }
 572        if (!skip_prefix(buffer, "author ", &buffer))
 573                return report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
 574        err = fsck_ident(&buffer, &commit->object, options);
 575        if (err)
 576                return err;
 577        if (!skip_prefix(buffer, "committer ", &buffer))
 578                return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
 579        err = fsck_ident(&buffer, &commit->object, options);
 580        if (err)
 581                return err;
 582        if (!commit->tree)
 583                return report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
 584
 585        return 0;
 586}
 587
 588static int fsck_commit(struct commit *commit, const char *data,
 589        unsigned long size, struct fsck_options *options)
 590{
 591        const char *buffer = data ?  data : get_commit_buffer(commit, &size);
 592        int ret = fsck_commit_buffer(commit, buffer, size, options);
 593        if (!data)
 594                unuse_commit_buffer(commit, buffer);
 595        return ret;
 596}
 597
 598static int fsck_tag_buffer(struct tag *tag, const char *data,
 599        unsigned long size, struct fsck_options *options)
 600{
 601        unsigned char sha1[20];
 602        int ret = 0;
 603        const char *buffer;
 604        char *to_free = NULL, *eol;
 605        struct strbuf sb = STRBUF_INIT;
 606
 607        if (data)
 608                buffer = data;
 609        else {
 610                enum object_type type;
 611
 612                buffer = to_free =
 613                        read_sha1_file(tag->object.sha1, &type, &size);
 614                if (!buffer)
 615                        return report(options, &tag->object,
 616                                FSCK_MSG_MISSING_TAG_OBJECT,
 617                                "cannot read tag object");
 618
 619                if (type != OBJ_TAG) {
 620                        ret = report(options, &tag->object,
 621                                FSCK_MSG_TAG_OBJECT_NOT_TAG,
 622                                "expected tag got %s",
 623                            typename(type));
 624                        goto done;
 625                }
 626        }
 627
 628        if (require_end_of_header(buffer, size, &tag->object, options))
 629                goto done;
 630
 631        if (!skip_prefix(buffer, "object ", &buffer)) {
 632                ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
 633                goto done;
 634        }
 635        if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
 636                ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
 637                goto done;
 638        }
 639        buffer += 41;
 640
 641        if (!skip_prefix(buffer, "type ", &buffer)) {
 642                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
 643                goto done;
 644        }
 645        eol = strchr(buffer, '\n');
 646        if (!eol) {
 647                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
 648                goto done;
 649        }
 650        if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
 651                ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
 652        if (ret)
 653                goto done;
 654        buffer = eol + 1;
 655
 656        if (!skip_prefix(buffer, "tag ", &buffer)) {
 657                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
 658                goto done;
 659        }
 660        eol = strchr(buffer, '\n');
 661        if (!eol) {
 662                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
 663                goto done;
 664        }
 665        strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
 666        if (check_refname_format(sb.buf, 0))
 667                report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
 668                           "invalid 'tag' name: %.*s",
 669                           (int)(eol - buffer), buffer);
 670        buffer = eol + 1;
 671
 672        if (!skip_prefix(buffer, "tagger ", &buffer))
 673                /* early tags do not contain 'tagger' lines; warn only */
 674                report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
 675        else
 676                ret = fsck_ident(&buffer, &tag->object, options);
 677
 678done:
 679        strbuf_release(&sb);
 680        free(to_free);
 681        return ret;
 682}
 683
 684static int fsck_tag(struct tag *tag, const char *data,
 685        unsigned long size, struct fsck_options *options)
 686{
 687        struct object *tagged = tag->tagged;
 688
 689        if (!tagged)
 690                return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
 691
 692        return fsck_tag_buffer(tag, data, size, options);
 693}
 694
 695int fsck_object(struct object *obj, void *data, unsigned long size,
 696        struct fsck_options *options)
 697{
 698        if (!obj)
 699                return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
 700
 701        if (obj->type == OBJ_BLOB)
 702                return 0;
 703        if (obj->type == OBJ_TREE)
 704                return fsck_tree((struct tree *) obj, options);
 705        if (obj->type == OBJ_COMMIT)
 706                return fsck_commit((struct commit *) obj, (const char *) data,
 707                        size, options);
 708        if (obj->type == OBJ_TAG)
 709                return fsck_tag((struct tag *) obj, (const char *) data,
 710                        size, options);
 711
 712        return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
 713                          obj->type);
 714}
 715
 716int fsck_error_function(struct object *obj, int msg_type, const char *message)
 717{
 718        if (msg_type == FSCK_WARN) {
 719                warning("object %s: %s", sha1_to_hex(obj->sha1), message);
 720                return 0;
 721        }
 722        error("object %s: %s", sha1_to_hex(obj->sha1), message);
 723        return 1;
 724}