Andrew's git - gitweb.git/blob

4748f1e23aacfcce03ca3b3aa5b511027a4bd505
   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        char *end;
 486
 487        if (**ident == '<')
 488                return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 489        *ident += strcspn(*ident, "<>\n");
 490        if (**ident == '>')
 491                return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
 492        if (**ident != '<')
 493                return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
 494        if ((*ident)[-1] != ' ')
 495                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 496        (*ident)++;
 497        *ident += strcspn(*ident, "<>\n");
 498        if (**ident != '>')
 499                return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
 500        (*ident)++;
 501        if (**ident != ' ')
 502                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
 503        (*ident)++;
 504        if (**ident == '0' && (*ident)[1] != ' ')
 505                return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
 506        if (date_overflows(strtoul(*ident, &end, 10)))
 507                return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
 508        if (end == *ident || *end != ' ')
 509                return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
 510        *ident = end + 1;
 511        if ((**ident != '+' && **ident != '-') ||
 512            !isdigit((*ident)[1]) ||
 513            !isdigit((*ident)[2]) ||
 514            !isdigit((*ident)[3]) ||
 515            !isdigit((*ident)[4]) ||
 516            ((*ident)[5] != '\n'))
 517                return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
 518        (*ident) += 6;
 519        return 0;
 520}
 521
 522static int fsck_commit_buffer(struct commit *commit, const char *buffer,
 523        unsigned long size, struct fsck_options *options)
 524{
 525        unsigned char tree_sha1[20], sha1[20];
 526        struct commit_graft *graft;
 527        unsigned parent_count, parent_line_count = 0;
 528        int err;
 529
 530        if (require_end_of_header(buffer, size, &commit->object, options))
 531                return -1;
 532
 533        if (!skip_prefix(buffer, "tree ", &buffer))
 534                return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
 535        if (get_sha1_hex(buffer, tree_sha1) || buffer[40] != '\n')
 536                return report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
 537        buffer += 41;
 538        while (skip_prefix(buffer, "parent ", &buffer)) {
 539                if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n')
 540                        return report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
 541                buffer += 41;
 542                parent_line_count++;
 543        }
 544        graft = lookup_commit_graft(commit->object.sha1);
 545        parent_count = commit_list_count(commit->parents);
 546        if (graft) {
 547                if (graft->nr_parent == -1 && !parent_count)
 548                        ; /* shallow commit */
 549                else if (graft->nr_parent != parent_count)
 550                        return report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
 551        } else {
 552                if (parent_count != parent_line_count)
 553                        return report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
 554        }
 555        if (!skip_prefix(buffer, "author ", &buffer))
 556                return report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
 557        err = fsck_ident(&buffer, &commit->object, options);
 558        if (err)
 559                return err;
 560        if (!skip_prefix(buffer, "committer ", &buffer))
 561                return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
 562        err = fsck_ident(&buffer, &commit->object, options);
 563        if (err)
 564                return err;
 565        if (!commit->tree)
 566                return report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
 567
 568        return 0;
 569}
 570
 571static int fsck_commit(struct commit *commit, const char *data,
 572        unsigned long size, struct fsck_options *options)
 573{
 574        const char *buffer = data ?  data : get_commit_buffer(commit, &size);
 575        int ret = fsck_commit_buffer(commit, buffer, size, options);
 576        if (!data)
 577                unuse_commit_buffer(commit, buffer);
 578        return ret;
 579}
 580
 581static int fsck_tag_buffer(struct tag *tag, const char *data,
 582        unsigned long size, struct fsck_options *options)
 583{
 584        unsigned char sha1[20];
 585        int ret = 0;
 586        const char *buffer;
 587        char *to_free = NULL, *eol;
 588        struct strbuf sb = STRBUF_INIT;
 589
 590        if (data)
 591                buffer = data;
 592        else {
 593                enum object_type type;
 594
 595                buffer = to_free =
 596                        read_sha1_file(tag->object.sha1, &type, &size);
 597                if (!buffer)
 598                        return report(options, &tag->object,
 599                                FSCK_MSG_MISSING_TAG_OBJECT,
 600                                "cannot read tag object");
 601
 602                if (type != OBJ_TAG) {
 603                        ret = report(options, &tag->object,
 604                                FSCK_MSG_TAG_OBJECT_NOT_TAG,
 605                                "expected tag got %s",
 606                            typename(type));
 607                        goto done;
 608                }
 609        }
 610
 611        if (require_end_of_header(buffer, size, &tag->object, options))
 612                goto done;
 613
 614        if (!skip_prefix(buffer, "object ", &buffer)) {
 615                ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
 616                goto done;
 617        }
 618        if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
 619                ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
 620                goto done;
 621        }
 622        buffer += 41;
 623
 624        if (!skip_prefix(buffer, "type ", &buffer)) {
 625                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
 626                goto done;
 627        }
 628        eol = strchr(buffer, '\n');
 629        if (!eol) {
 630                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
 631                goto done;
 632        }
 633        if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
 634                ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
 635        if (ret)
 636                goto done;
 637        buffer = eol + 1;
 638
 639        if (!skip_prefix(buffer, "tag ", &buffer)) {
 640                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
 641                goto done;
 642        }
 643        eol = strchr(buffer, '\n');
 644        if (!eol) {
 645                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
 646                goto done;
 647        }
 648        strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
 649        if (check_refname_format(sb.buf, 0))
 650                report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
 651                           "invalid 'tag' name: %.*s",
 652                           (int)(eol - buffer), buffer);
 653        buffer = eol + 1;
 654
 655        if (!skip_prefix(buffer, "tagger ", &buffer))
 656                /* early tags do not contain 'tagger' lines; warn only */
 657                report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
 658        else
 659                ret = fsck_ident(&buffer, &tag->object, options);
 660
 661done:
 662        strbuf_release(&sb);
 663        free(to_free);
 664        return ret;
 665}
 666
 667static int fsck_tag(struct tag *tag, const char *data,
 668        unsigned long size, struct fsck_options *options)
 669{
 670        struct object *tagged = tag->tagged;
 671
 672        if (!tagged)
 673                return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
 674
 675        return fsck_tag_buffer(tag, data, size, options);
 676}
 677
 678int fsck_object(struct object *obj, void *data, unsigned long size,
 679        struct fsck_options *options)
 680{
 681        if (!obj)
 682                return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
 683
 684        if (obj->type == OBJ_BLOB)
 685                return 0;
 686        if (obj->type == OBJ_TREE)
 687                return fsck_tree((struct tree *) obj, options);
 688        if (obj->type == OBJ_COMMIT)
 689                return fsck_commit((struct commit *) obj, (const char *) data,
 690                        size, options);
 691        if (obj->type == OBJ_TAG)
 692                return fsck_tag((struct tag *) obj, (const char *) data,
 693                        size, options);
 694
 695        return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
 696                          obj->type);
 697}
 698
 699int fsck_error_function(struct object *obj, int msg_type, const char *message)
 700{
 701        if (msg_type == FSCK_WARN) {
 702                warning("object %s: %s", sha1_to_hex(obj->sha1), message);
 703                return 0;
 704        }
 705        error("object %s: %s", sha1_to_hex(obj->sha1), message);
 706        return 1;
 707}