Andrew's git - gitweb.git/blob

e6e8dc4c987ba199eef4d605da360a6d07383c00
   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
 192__attribute__((format (printf, 4, 5)))
 193static int report(struct fsck_options *options, struct object *object,
 194        enum fsck_msg_id id, const char *fmt, ...)
 195{
 196        va_list ap;
 197        struct strbuf sb = STRBUF_INIT;
 198        int msg_type = fsck_msg_type(id, options), result;
 199
 200        va_start(ap, fmt);
 201        strbuf_vaddf(&sb, fmt, ap);
 202        result = options->error_func(object, msg_type, sb.buf);
 203        strbuf_release(&sb);
 204        va_end(ap);
 205
 206        return result;
 207}
 208
 209static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
 210{
 211        struct tree_desc desc;
 212        struct name_entry entry;
 213        int res = 0;
 214
 215        if (parse_tree(tree))
 216                return -1;
 217
 218        init_tree_desc(&desc, tree->buffer, tree->size);
 219        while (tree_entry(&desc, &entry)) {
 220                int result;
 221
 222                if (S_ISGITLINK(entry.mode))
 223                        continue;
 224                if (S_ISDIR(entry.mode))
 225                        result = options->walk(&lookup_tree(entry.sha1)->object, OBJ_TREE, data, options);
 226                else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode))
 227                        result = options->walk(&lookup_blob(entry.sha1)->object, OBJ_BLOB, data, options);
 228                else {
 229                        result = error("in tree %s: entry %s has bad mode %.6o",
 230                                        sha1_to_hex(tree->object.sha1), entry.path, entry.mode);
 231                }
 232                if (result < 0)
 233                        return result;
 234                if (!res)
 235                        res = result;
 236        }
 237        return res;
 238}
 239
 240static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
 241{
 242        struct commit_list *parents;
 243        int res;
 244        int result;
 245
 246        if (parse_commit(commit))
 247                return -1;
 248
 249        result = options->walk((struct object *)commit->tree, OBJ_TREE, data, options);
 250        if (result < 0)
 251                return result;
 252        res = result;
 253
 254        parents = commit->parents;
 255        while (parents) {
 256                result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
 257                if (result < 0)
 258                        return result;
 259                if (!res)
 260                        res = result;
 261                parents = parents->next;
 262        }
 263        return res;
 264}
 265
 266static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
 267{
 268        if (parse_tag(tag))
 269                return -1;
 270        return options->walk(tag->tagged, OBJ_ANY, data, options);
 271}
 272
 273int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
 274{
 275        if (!obj)
 276                return -1;
 277        switch (obj->type) {
 278        case OBJ_BLOB:
 279                return 0;
 280        case OBJ_TREE:
 281                return fsck_walk_tree((struct tree *)obj, data, options);
 282        case OBJ_COMMIT:
 283                return fsck_walk_commit((struct commit *)obj, data, options);
 284        case OBJ_TAG:
 285                return fsck_walk_tag((struct tag *)obj, data, options);
 286        default:
 287                error("Unknown object type for %s", sha1_to_hex(obj->sha1));
 288                return -1;
 289        }
 290}
 291
 292/*
 293 * The entries in a tree are ordered in the _path_ order,
 294 * which means that a directory entry is ordered by adding
 295 * a slash to the end of it.
 296 *
 297 * So a directory called "a" is ordered _after_ a file
 298 * called "a.c", because "a/" sorts after "a.c".
 299 */
 300#define TREE_UNORDERED (-1)
 301#define TREE_HAS_DUPS  (-2)
 302
 303static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
 304{
 305        int len1 = strlen(name1);
 306        int len2 = strlen(name2);
 307        int len = len1 < len2 ? len1 : len2;
 308        unsigned char c1, c2;
 309        int cmp;
 310
 311        cmp = memcmp(name1, name2, len);
 312        if (cmp < 0)
 313                return 0;
 314        if (cmp > 0)
 315                return TREE_UNORDERED;
 316
 317        /*
 318         * Ok, the first <len> characters are the same.
 319         * Now we need to order the next one, but turn
 320         * a '\0' into a '/' for a directory entry.
 321         */
 322        c1 = name1[len];
 323        c2 = name2[len];
 324        if (!c1 && !c2)
 325                /*
 326                 * git-write-tree used to write out a nonsense tree that has
 327                 * entries with the same name, one blob and one tree.  Make
 328                 * sure we do not have duplicate entries.
 329                 */
 330                return TREE_HAS_DUPS;
 331        if (!c1 && S_ISDIR(mode1))
 332                c1 = '/';
 333        if (!c2 && S_ISDIR(mode2))
 334                c2 = '/';
 335        return c1 < c2 ? 0 : TREE_UNORDERED;
 336}
 337
 338static int fsck_tree(struct tree *item, struct fsck_options *options)
 339{
 340        int retval;
 341        int has_null_sha1 = 0;
 342        int has_full_path = 0;
 343        int has_empty_name = 0;
 344        int has_dot = 0;
 345        int has_dotdot = 0;
 346        int has_dotgit = 0;
 347        int has_zero_pad = 0;
 348        int has_bad_modes = 0;
 349        int has_dup_entries = 0;
 350        int not_properly_sorted = 0;
 351        struct tree_desc desc;
 352        unsigned o_mode;
 353        const char *o_name;
 354
 355        init_tree_desc(&desc, item->buffer, item->size);
 356
 357        o_mode = 0;
 358        o_name = NULL;
 359
 360        while (desc.size) {
 361                unsigned mode;
 362                const char *name;
 363                const unsigned char *sha1;
 364
 365                sha1 = tree_entry_extract(&desc, &name, &mode);
 366
 367                has_null_sha1 |= is_null_sha1(sha1);
 368                has_full_path |= !!strchr(name, '/');
 369                has_empty_name |= !*name;
 370                has_dot |= !strcmp(name, ".");
 371                has_dotdot |= !strcmp(name, "..");
 372                has_dotgit |= (!strcmp(name, ".git") ||
 373                               is_hfs_dotgit(name) ||
 374                               is_ntfs_dotgit(name));
 375                has_zero_pad |= *(char *)desc.buffer == '0';
 376                update_tree_entry(&desc);
 377
 378                switch (mode) {
 379                /*
 380                 * Standard modes..
 381                 */
 382                case S_IFREG | 0755:
 383                case S_IFREG | 0644:
 384                case S_IFLNK:
 385                case S_IFDIR:
 386                case S_IFGITLINK:
 387                        break;
 388                /*
 389                 * This is nonstandard, but we had a few of these
 390                 * early on when we honored the full set of mode
 391                 * bits..
 392                 */
 393                case S_IFREG | 0664:
 394                        if (!options->strict)
 395                                break;
 396                default:
 397                        has_bad_modes = 1;
 398                }
 399
 400                if (o_name) {
 401                        switch (verify_ordered(o_mode, o_name, mode, name)) {
 402                        case TREE_UNORDERED:
 403                                not_properly_sorted = 1;
 404                                break;
 405                        case TREE_HAS_DUPS:
 406                                has_dup_entries = 1;
 407                                break;
 408                        default:
 409                                break;
 410                        }
 411                }
 412
 413                o_mode = mode;
 414                o_name = name;
 415        }
 416
 417        retval = 0;
 418        if (has_null_sha1)
 419                retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
 420        if (has_full_path)
 421                retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
 422        if (has_empty_name)
 423                retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
 424        if (has_dot)
 425                retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
 426        if (has_dotdot)
 427                retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
 428        if (has_dotgit)
 429                retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
 430        if (has_zero_pad)
 431                retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
 432        if (has_bad_modes)
 433                retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
 434        if (has_dup_entries)
 435                retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
 436        if (not_properly_sorted)
 437                retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
 438        return retval;
 439}
 440
 441static int require_end_of_header(const void *data, unsigned long size,
 442        struct object *obj, struct fsck_options *options)
 443{
 444        const char *buffer = (const char *)data;
 445        unsigned long i;
 446
 447        for (i = 0; i < size; i++) {
 448                switch (buffer[i]) {
 449                case '\0':
 450                        return report(options, obj,
 451                                FSCK_MSG_NUL_IN_HEADER,
 452                                "unterminated header: NUL at offset %ld", i);
 453                case '\n':
 454                        if (i + 1 < size && buffer[i + 1] == '\n')
 455                                return 0;
 456                }
 457        }
 458
 459        return report(options, obj,
 460                FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
 461}
 462
 463static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
 464{
 465        char *end;
 466
 467        if (**ident == '<')
 468                return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 469        *ident += strcspn(*ident, "<>\n");
 470        if (**ident == '>')
 471                return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
 472        if (**ident != '<')
 473                return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
 474        if ((*ident)[-1] != ' ')
 475                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 476        (*ident)++;
 477        *ident += strcspn(*ident, "<>\n");
 478        if (**ident != '>')
 479                return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
 480        (*ident)++;
 481        if (**ident != ' ')
 482                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
 483        (*ident)++;
 484        if (**ident == '0' && (*ident)[1] != ' ')
 485                return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
 486        if (date_overflows(strtoul(*ident, &end, 10)))
 487                return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
 488        if (end == *ident || *end != ' ')
 489                return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
 490        *ident = end + 1;
 491        if ((**ident != '+' && **ident != '-') ||
 492            !isdigit((*ident)[1]) ||
 493            !isdigit((*ident)[2]) ||
 494            !isdigit((*ident)[3]) ||
 495            !isdigit((*ident)[4]) ||
 496            ((*ident)[5] != '\n'))
 497                return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
 498        (*ident) += 6;
 499        return 0;
 500}
 501
 502static int fsck_commit_buffer(struct commit *commit, const char *buffer,
 503        unsigned long size, struct fsck_options *options)
 504{
 505        unsigned char tree_sha1[20], sha1[20];
 506        struct commit_graft *graft;
 507        unsigned parent_count, parent_line_count = 0;
 508        int err;
 509
 510        if (require_end_of_header(buffer, size, &commit->object, options))
 511                return -1;
 512
 513        if (!skip_prefix(buffer, "tree ", &buffer))
 514                return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
 515        if (get_sha1_hex(buffer, tree_sha1) || buffer[40] != '\n')
 516                return report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
 517        buffer += 41;
 518        while (skip_prefix(buffer, "parent ", &buffer)) {
 519                if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n')
 520                        return report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
 521                buffer += 41;
 522                parent_line_count++;
 523        }
 524        graft = lookup_commit_graft(commit->object.sha1);
 525        parent_count = commit_list_count(commit->parents);
 526        if (graft) {
 527                if (graft->nr_parent == -1 && !parent_count)
 528                        ; /* shallow commit */
 529                else if (graft->nr_parent != parent_count)
 530                        return report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
 531        } else {
 532                if (parent_count != parent_line_count)
 533                        return report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
 534        }
 535        if (!skip_prefix(buffer, "author ", &buffer))
 536                return report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
 537        err = fsck_ident(&buffer, &commit->object, options);
 538        if (err)
 539                return err;
 540        if (!skip_prefix(buffer, "committer ", &buffer))
 541                return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
 542        err = fsck_ident(&buffer, &commit->object, options);
 543        if (err)
 544                return err;
 545        if (!commit->tree)
 546                return report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
 547
 548        return 0;
 549}
 550
 551static int fsck_commit(struct commit *commit, const char *data,
 552        unsigned long size, struct fsck_options *options)
 553{
 554        const char *buffer = data ?  data : get_commit_buffer(commit, &size);
 555        int ret = fsck_commit_buffer(commit, buffer, size, options);
 556        if (!data)
 557                unuse_commit_buffer(commit, buffer);
 558        return ret;
 559}
 560
 561static int fsck_tag_buffer(struct tag *tag, const char *data,
 562        unsigned long size, struct fsck_options *options)
 563{
 564        unsigned char sha1[20];
 565        int ret = 0;
 566        const char *buffer;
 567        char *to_free = NULL, *eol;
 568        struct strbuf sb = STRBUF_INIT;
 569
 570        if (data)
 571                buffer = data;
 572        else {
 573                enum object_type type;
 574
 575                buffer = to_free =
 576                        read_sha1_file(tag->object.sha1, &type, &size);
 577                if (!buffer)
 578                        return report(options, &tag->object,
 579                                FSCK_MSG_MISSING_TAG_OBJECT,
 580                                "cannot read tag object");
 581
 582                if (type != OBJ_TAG) {
 583                        ret = report(options, &tag->object,
 584                                FSCK_MSG_TAG_OBJECT_NOT_TAG,
 585                                "expected tag got %s",
 586                            typename(type));
 587                        goto done;
 588                }
 589        }
 590
 591        if (require_end_of_header(buffer, size, &tag->object, options))
 592                goto done;
 593
 594        if (!skip_prefix(buffer, "object ", &buffer)) {
 595                ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
 596                goto done;
 597        }
 598        if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
 599                ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
 600                goto done;
 601        }
 602        buffer += 41;
 603
 604        if (!skip_prefix(buffer, "type ", &buffer)) {
 605                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
 606                goto done;
 607        }
 608        eol = strchr(buffer, '\n');
 609        if (!eol) {
 610                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
 611                goto done;
 612        }
 613        if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
 614                ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
 615        if (ret)
 616                goto done;
 617        buffer = eol + 1;
 618
 619        if (!skip_prefix(buffer, "tag ", &buffer)) {
 620                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
 621                goto done;
 622        }
 623        eol = strchr(buffer, '\n');
 624        if (!eol) {
 625                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
 626                goto done;
 627        }
 628        strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
 629        if (check_refname_format(sb.buf, 0))
 630                report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
 631                           "invalid 'tag' name: %.*s",
 632                           (int)(eol - buffer), buffer);
 633        buffer = eol + 1;
 634
 635        if (!skip_prefix(buffer, "tagger ", &buffer))
 636                /* early tags do not contain 'tagger' lines; warn only */
 637                report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
 638        else
 639                ret = fsck_ident(&buffer, &tag->object, options);
 640
 641done:
 642        strbuf_release(&sb);
 643        free(to_free);
 644        return ret;
 645}
 646
 647static int fsck_tag(struct tag *tag, const char *data,
 648        unsigned long size, struct fsck_options *options)
 649{
 650        struct object *tagged = tag->tagged;
 651
 652        if (!tagged)
 653                return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
 654
 655        return fsck_tag_buffer(tag, data, size, options);
 656}
 657
 658int fsck_object(struct object *obj, void *data, unsigned long size,
 659        struct fsck_options *options)
 660{
 661        if (!obj)
 662                return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
 663
 664        if (obj->type == OBJ_BLOB)
 665                return 0;
 666        if (obj->type == OBJ_TREE)
 667                return fsck_tree((struct tree *) obj, options);
 668        if (obj->type == OBJ_COMMIT)
 669                return fsck_commit((struct commit *) obj, (const char *) data,
 670                        size, options);
 671        if (obj->type == OBJ_TAG)
 672                return fsck_tag((struct tag *) obj, (const char *) data,
 673                        size, options);
 674
 675        return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
 676                          obj->type);
 677}
 678
 679int fsck_error_function(struct object *obj, int msg_type, const char *message)
 680{
 681        if (msg_type == FSCK_WARN) {
 682                warning("object %s: %s", sha1_to_hex(obj->sha1), message);
 683                return 0;
 684        }
 685        error("object %s: %s", sha1_to_hex(obj->sha1), message);
 686        return 1;
 687}