Andrew's git / gitweb.git / fsck.c
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fsck.con commit fsck: offer a function to demote fsck errors to warnings (0282f4d)
   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
 134void fsck_set_msg_type(struct fsck_options *options,
 135                const char *msg_id, const char *msg_type)
 136{
 137        int id = parse_msg_id(msg_id), type;
 138
 139        if (id < 0)
 140                die("Unhandled message id: %s", msg_id);
 141        type = parse_msg_type(msg_type);
 142
 143        if (!options->msg_type) {
 144                int i;
 145                int *msg_type = xmalloc(sizeof(int) * FSCK_MSG_MAX);
 146                for (i = 0; i < FSCK_MSG_MAX; i++)
 147                        msg_type[i] = fsck_msg_type(i, options);
 148                options->msg_type = msg_type;
 149        }
 150
 151        options->msg_type[id] = type;
 152}
 153
 154void fsck_set_msg_types(struct fsck_options *options, const char *values)
 155{
 156        char *buf = xstrdup(values), *to_free = buf;
 157        int done = 0;
 158
 159        while (!done) {
 160                int len = strcspn(buf, " ,|"), equal;
 161
 162                done = !buf[len];
 163                if (!len) {
 164                        buf++;
 165                        continue;
 166                }
 167                buf[len] = '\0';
 168
 169                for (equal = 0;
 170                     equal < len && buf[equal] != '=' && buf[equal] != ':';
 171                     equal++)
 172                        buf[equal] = tolower(buf[equal]);
 173                buf[equal] = '\0';
 174
 175                if (equal == len)
 176                        die("Missing '=': '%s'", buf);
 177
 178                fsck_set_msg_type(options, buf, buf + equal + 1);
 179                buf += len + 1;
 180        }
 181        free(to_free);
 182}
 183
 184__attribute__((format (printf, 4, 5)))
 185static int report(struct fsck_options *options, struct object *object,
 186        enum fsck_msg_id id, const char *fmt, ...)
 187{
 188        va_list ap;
 189        struct strbuf sb = STRBUF_INIT;
 190        int msg_type = fsck_msg_type(id, options), result;
 191
 192        va_start(ap, fmt);
 193        strbuf_vaddf(&sb, fmt, ap);
 194        result = options->error_func(object, msg_type, sb.buf);
 195        strbuf_release(&sb);
 196        va_end(ap);
 197
 198        return result;
 199}
 200
 201static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
 202{
 203        struct tree_desc desc;
 204        struct name_entry entry;
 205        int res = 0;
 206
 207        if (parse_tree(tree))
 208                return -1;
 209
 210        init_tree_desc(&desc, tree->buffer, tree->size);
 211        while (tree_entry(&desc, &entry)) {
 212                int result;
 213
 214                if (S_ISGITLINK(entry.mode))
 215                        continue;
 216                if (S_ISDIR(entry.mode))
 217                        result = options->walk(&lookup_tree(entry.sha1)->object, OBJ_TREE, data, options);
 218                else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode))
 219                        result = options->walk(&lookup_blob(entry.sha1)->object, OBJ_BLOB, data, options);
 220                else {
 221                        result = error("in tree %s: entry %s has bad mode %.6o",
 222                                        sha1_to_hex(tree->object.sha1), entry.path, entry.mode);
 223                }
 224                if (result < 0)
 225                        return result;
 226                if (!res)
 227                        res = result;
 228        }
 229        return res;
 230}
 231
 232static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
 233{
 234        struct commit_list *parents;
 235        int res;
 236        int result;
 237
 238        if (parse_commit(commit))
 239                return -1;
 240
 241        result = options->walk((struct object *)commit->tree, OBJ_TREE, data, options);
 242        if (result < 0)
 243                return result;
 244        res = result;
 245
 246        parents = commit->parents;
 247        while (parents) {
 248                result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
 249                if (result < 0)
 250                        return result;
 251                if (!res)
 252                        res = result;
 253                parents = parents->next;
 254        }
 255        return res;
 256}
 257
 258static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
 259{
 260        if (parse_tag(tag))
 261                return -1;
 262        return options->walk(tag->tagged, OBJ_ANY, data, options);
 263}
 264
 265int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
 266{
 267        if (!obj)
 268                return -1;
 269        switch (obj->type) {
 270        case OBJ_BLOB:
 271                return 0;
 272        case OBJ_TREE:
 273                return fsck_walk_tree((struct tree *)obj, data, options);
 274        case OBJ_COMMIT:
 275                return fsck_walk_commit((struct commit *)obj, data, options);
 276        case OBJ_TAG:
 277                return fsck_walk_tag((struct tag *)obj, data, options);
 278        default:
 279                error("Unknown object type for %s", sha1_to_hex(obj->sha1));
 280                return -1;
 281        }
 282}
 283
 284/*
 285 * The entries in a tree are ordered in the _path_ order,
 286 * which means that a directory entry is ordered by adding
 287 * a slash to the end of it.
 288 *
 289 * So a directory called "a" is ordered _after_ a file
 290 * called "a.c", because "a/" sorts after "a.c".
 291 */
 292#define TREE_UNORDERED (-1)
 293#define TREE_HAS_DUPS  (-2)
 294
 295static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
 296{
 297        int len1 = strlen(name1);
 298        int len2 = strlen(name2);
 299        int len = len1 < len2 ? len1 : len2;
 300        unsigned char c1, c2;
 301        int cmp;
 302
 303        cmp = memcmp(name1, name2, len);
 304        if (cmp < 0)
 305                return 0;
 306        if (cmp > 0)
 307                return TREE_UNORDERED;
 308
 309        /*
 310         * Ok, the first <len> characters are the same.
 311         * Now we need to order the next one, but turn
 312         * a '\0' into a '/' for a directory entry.
 313         */
 314        c1 = name1[len];
 315        c2 = name2[len];
 316        if (!c1 && !c2)
 317                /*
 318                 * git-write-tree used to write out a nonsense tree that has
 319                 * entries with the same name, one blob and one tree.  Make
 320                 * sure we do not have duplicate entries.
 321                 */
 322                return TREE_HAS_DUPS;
 323        if (!c1 && S_ISDIR(mode1))
 324                c1 = '/';
 325        if (!c2 && S_ISDIR(mode2))
 326                c2 = '/';
 327        return c1 < c2 ? 0 : TREE_UNORDERED;
 328}
 329
 330static int fsck_tree(struct tree *item, struct fsck_options *options)
 331{
 332        int retval;
 333        int has_null_sha1 = 0;
 334        int has_full_path = 0;
 335        int has_empty_name = 0;
 336        int has_dot = 0;
 337        int has_dotdot = 0;
 338        int has_dotgit = 0;
 339        int has_zero_pad = 0;
 340        int has_bad_modes = 0;
 341        int has_dup_entries = 0;
 342        int not_properly_sorted = 0;
 343        struct tree_desc desc;
 344        unsigned o_mode;
 345        const char *o_name;
 346
 347        init_tree_desc(&desc, item->buffer, item->size);
 348
 349        o_mode = 0;
 350        o_name = NULL;
 351
 352        while (desc.size) {
 353                unsigned mode;
 354                const char *name;
 355                const unsigned char *sha1;
 356
 357                sha1 = tree_entry_extract(&desc, &name, &mode);
 358
 359                has_null_sha1 |= is_null_sha1(sha1);
 360                has_full_path |= !!strchr(name, '/');
 361                has_empty_name |= !*name;
 362                has_dot |= !strcmp(name, ".");
 363                has_dotdot |= !strcmp(name, "..");
 364                has_dotgit |= (!strcmp(name, ".git") ||
 365                               is_hfs_dotgit(name) ||
 366                               is_ntfs_dotgit(name));
 367                has_zero_pad |= *(char *)desc.buffer == '0';
 368                update_tree_entry(&desc);
 369
 370                switch (mode) {
 371                /*
 372                 * Standard modes..
 373                 */
 374                case S_IFREG | 0755:
 375                case S_IFREG | 0644:
 376                case S_IFLNK:
 377                case S_IFDIR:
 378                case S_IFGITLINK:
 379                        break;
 380                /*
 381                 * This is nonstandard, but we had a few of these
 382                 * early on when we honored the full set of mode
 383                 * bits..
 384                 */
 385                case S_IFREG | 0664:
 386                        if (!options->strict)
 387                                break;
 388                default:
 389                        has_bad_modes = 1;
 390                }
 391
 392                if (o_name) {
 393                        switch (verify_ordered(o_mode, o_name, mode, name)) {
 394                        case TREE_UNORDERED:
 395                                not_properly_sorted = 1;
 396                                break;
 397                        case TREE_HAS_DUPS:
 398                                has_dup_entries = 1;
 399                                break;
 400                        default:
 401                                break;
 402                        }
 403                }
 404
 405                o_mode = mode;
 406                o_name = name;
 407        }
 408
 409        retval = 0;
 410        if (has_null_sha1)
 411                retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
 412        if (has_full_path)
 413                retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
 414        if (has_empty_name)
 415                retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
 416        if (has_dot)
 417                retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
 418        if (has_dotdot)
 419                retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
 420        if (has_dotgit)
 421                retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
 422        if (has_zero_pad)
 423                retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
 424        if (has_bad_modes)
 425                retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
 426        if (has_dup_entries)
 427                retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
 428        if (not_properly_sorted)
 429                retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
 430        return retval;
 431}
 432
 433static int require_end_of_header(const void *data, unsigned long size,
 434        struct object *obj, struct fsck_options *options)
 435{
 436        const char *buffer = (const char *)data;
 437        unsigned long i;
 438
 439        for (i = 0; i < size; i++) {
 440                switch (buffer[i]) {
 441                case '\0':
 442                        return report(options, obj,
 443                                FSCK_MSG_NUL_IN_HEADER,
 444                                "unterminated header: NUL at offset %ld", i);
 445                case '\n':
 446                        if (i + 1 < size && buffer[i + 1] == '\n')
 447                                return 0;
 448                }
 449        }
 450
 451        return report(options, obj,
 452                FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
 453}
 454
 455static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
 456{
 457        char *end;
 458
 459        if (**ident == '<')
 460                return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 461        *ident += strcspn(*ident, "<>\n");
 462        if (**ident == '>')
 463                return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
 464        if (**ident != '<')
 465                return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
 466        if ((*ident)[-1] != ' ')
 467                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 468        (*ident)++;
 469        *ident += strcspn(*ident, "<>\n");
 470        if (**ident != '>')
 471                return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
 472        (*ident)++;
 473        if (**ident != ' ')
 474                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
 475        (*ident)++;
 476        if (**ident == '0' && (*ident)[1] != ' ')
 477                return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
 478        if (date_overflows(strtoul(*ident, &end, 10)))
 479                return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
 480        if (end == *ident || *end != ' ')
 481                return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
 482        *ident = end + 1;
 483        if ((**ident != '+' && **ident != '-') ||
 484            !isdigit((*ident)[1]) ||
 485            !isdigit((*ident)[2]) ||
 486            !isdigit((*ident)[3]) ||
 487            !isdigit((*ident)[4]) ||
 488            ((*ident)[5] != '\n'))
 489                return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
 490        (*ident) += 6;
 491        return 0;
 492}
 493
 494static int fsck_commit_buffer(struct commit *commit, const char *buffer,
 495        unsigned long size, struct fsck_options *options)
 496{
 497        unsigned char tree_sha1[20], sha1[20];
 498        struct commit_graft *graft;
 499        unsigned parent_count, parent_line_count = 0;
 500        int err;
 501
 502        if (require_end_of_header(buffer, size, &commit->object, options))
 503                return -1;
 504
 505        if (!skip_prefix(buffer, "tree ", &buffer))
 506                return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
 507        if (get_sha1_hex(buffer, tree_sha1) || buffer[40] != '\n')
 508                return report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
 509        buffer += 41;
 510        while (skip_prefix(buffer, "parent ", &buffer)) {
 511                if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n')
 512                        return report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
 513                buffer += 41;
 514                parent_line_count++;
 515        }
 516        graft = lookup_commit_graft(commit->object.sha1);
 517        parent_count = commit_list_count(commit->parents);
 518        if (graft) {
 519                if (graft->nr_parent == -1 && !parent_count)
 520                        ; /* shallow commit */
 521                else if (graft->nr_parent != parent_count)
 522                        return report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
 523        } else {
 524                if (parent_count != parent_line_count)
 525                        return report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
 526        }
 527        if (!skip_prefix(buffer, "author ", &buffer))
 528                return report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
 529        err = fsck_ident(&buffer, &commit->object, options);
 530        if (err)
 531                return err;
 532        if (!skip_prefix(buffer, "committer ", &buffer))
 533                return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
 534        err = fsck_ident(&buffer, &commit->object, options);
 535        if (err)
 536                return err;
 537        if (!commit->tree)
 538                return report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
 539
 540        return 0;
 541}
 542
 543static int fsck_commit(struct commit *commit, const char *data,
 544        unsigned long size, struct fsck_options *options)
 545{
 546        const char *buffer = data ?  data : get_commit_buffer(commit, &size);
 547        int ret = fsck_commit_buffer(commit, buffer, size, options);
 548        if (!data)
 549                unuse_commit_buffer(commit, buffer);
 550        return ret;
 551}
 552
 553static int fsck_tag_buffer(struct tag *tag, const char *data,
 554        unsigned long size, struct fsck_options *options)
 555{
 556        unsigned char sha1[20];
 557        int ret = 0;
 558        const char *buffer;
 559        char *to_free = NULL, *eol;
 560        struct strbuf sb = STRBUF_INIT;
 561
 562        if (data)
 563                buffer = data;
 564        else {
 565                enum object_type type;
 566
 567                buffer = to_free =
 568                        read_sha1_file(tag->object.sha1, &type, &size);
 569                if (!buffer)
 570                        return report(options, &tag->object,
 571                                FSCK_MSG_MISSING_TAG_OBJECT,
 572                                "cannot read tag object");
 573
 574                if (type != OBJ_TAG) {
 575                        ret = report(options, &tag->object,
 576                                FSCK_MSG_TAG_OBJECT_NOT_TAG,
 577                                "expected tag got %s",
 578                            typename(type));
 579                        goto done;
 580                }
 581        }
 582
 583        if (require_end_of_header(buffer, size, &tag->object, options))
 584                goto done;
 585
 586        if (!skip_prefix(buffer, "object ", &buffer)) {
 587                ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
 588                goto done;
 589        }
 590        if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
 591                ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
 592                goto done;
 593        }
 594        buffer += 41;
 595
 596        if (!skip_prefix(buffer, "type ", &buffer)) {
 597                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
 598                goto done;
 599        }
 600        eol = strchr(buffer, '\n');
 601        if (!eol) {
 602                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
 603                goto done;
 604        }
 605        if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
 606                ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
 607        if (ret)
 608                goto done;
 609        buffer = eol + 1;
 610
 611        if (!skip_prefix(buffer, "tag ", &buffer)) {
 612                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
 613                goto done;
 614        }
 615        eol = strchr(buffer, '\n');
 616        if (!eol) {
 617                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
 618                goto done;
 619        }
 620        strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
 621        if (check_refname_format(sb.buf, 0))
 622                report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
 623                           "invalid 'tag' name: %.*s",
 624                           (int)(eol - buffer), buffer);
 625        buffer = eol + 1;
 626
 627        if (!skip_prefix(buffer, "tagger ", &buffer))
 628                /* early tags do not contain 'tagger' lines; warn only */
 629                report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
 630        else
 631                ret = fsck_ident(&buffer, &tag->object, options);
 632
 633done:
 634        strbuf_release(&sb);
 635        free(to_free);
 636        return ret;
 637}
 638
 639static int fsck_tag(struct tag *tag, const char *data,
 640        unsigned long size, struct fsck_options *options)
 641{
 642        struct object *tagged = tag->tagged;
 643
 644        if (!tagged)
 645                return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
 646
 647        return fsck_tag_buffer(tag, data, size, options);
 648}
 649
 650int fsck_object(struct object *obj, void *data, unsigned long size,
 651        struct fsck_options *options)
 652{
 653        if (!obj)
 654                return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
 655
 656        if (obj->type == OBJ_BLOB)
 657                return 0;
 658        if (obj->type == OBJ_TREE)
 659                return fsck_tree((struct tree *) obj, options);
 660        if (obj->type == OBJ_COMMIT)
 661                return fsck_commit((struct commit *) obj, (const char *) data,
 662                        size, options);
 663        if (obj->type == OBJ_TAG)
 664                return fsck_tag((struct tag *) obj, (const char *) data,
 665                        size, options);
 666
 667        return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
 668                          obj->type);
 669}
 670
 671int fsck_error_function(struct object *obj, int msg_type, const char *message)
 672{
 673        if (msg_type == FSCK_WARN) {
 674                warning("object %s: %s", sha1_to_hex(obj->sha1), message);
 675                return 0;
 676        }
 677        error("object %s: %s", sha1_to_hex(obj->sha1), message);
 678        return 1;
 679}