Andrew's git / gitweb.git / fsck.c
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fsck.con commit fsck: make fsck_tag() warn-friendly (7d7d5b0)
   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(MULTIPLE_AUTHORS, ERROR) \
  42        FUNC(NUL_IN_HEADER, ERROR) \
  43        FUNC(TAG_OBJECT_NOT_TAG, ERROR) \
  44        FUNC(TREE_NOT_SORTED, ERROR) \
  45        FUNC(UNKNOWN_TYPE, ERROR) \
  46        FUNC(UNTERMINATED_HEADER, ERROR) \
  47        FUNC(ZERO_PADDED_DATE, ERROR) \
  48        /* warnings */ \
  49        FUNC(BAD_FILEMODE, WARN) \
  50        FUNC(BAD_TAG_NAME, WARN) \
  51        FUNC(EMPTY_NAME, WARN) \
  52        FUNC(FULL_PATHNAME, WARN) \
  53        FUNC(HAS_DOT, WARN) \
  54        FUNC(HAS_DOTDOT, WARN) \
  55        FUNC(HAS_DOTGIT, WARN) \
  56        FUNC(MISSING_TAGGER_ENTRY, WARN) \
  57        FUNC(NULL_SHA1, WARN) \
  58        FUNC(ZERO_PADDED_FILEMODE, WARN)
  59
  60#define MSG_ID(id, msg_type) FSCK_MSG_##id,
  61enum fsck_msg_id {
  62        FOREACH_MSG_ID(MSG_ID)
  63        FSCK_MSG_MAX
  64};
  65#undef MSG_ID
  66
  67#define STR(x) #x
  68#define MSG_ID(id, msg_type) { STR(id), NULL, FSCK_##msg_type },
  69static struct {
  70        const char *id_string;
  71        const char *downcased;
  72        int msg_type;
  73} msg_id_info[FSCK_MSG_MAX + 1] = {
  74        FOREACH_MSG_ID(MSG_ID)
  75        { NULL, NULL, -1 }
  76};
  77#undef MSG_ID
  78
  79static int parse_msg_id(const char *text)
  80{
  81        int i;
  82
  83        if (!msg_id_info[0].downcased) {
  84                /* convert id_string to lower case, without underscores. */
  85                for (i = 0; i < FSCK_MSG_MAX; i++) {
  86                        const char *p = msg_id_info[i].id_string;
  87                        int len = strlen(p);
  88                        char *q = xmalloc(len);
  89
  90                        msg_id_info[i].downcased = q;
  91                        while (*p)
  92                                if (*p == '_')
  93                                        p++;
  94                                else
  95                                        *(q)++ = tolower(*(p)++);
  96                        *q = '\0';
  97                }
  98        }
  99
 100        for (i = 0; i < FSCK_MSG_MAX; i++)
 101                if (!strcmp(text, msg_id_info[i].downcased))
 102                        return i;
 103
 104        return -1;
 105}
 106
 107static int fsck_msg_type(enum fsck_msg_id msg_id,
 108        struct fsck_options *options)
 109{
 110        int msg_type;
 111
 112        assert(msg_id >= 0 && msg_id < FSCK_MSG_MAX);
 113
 114        if (options->msg_type)
 115                msg_type = options->msg_type[msg_id];
 116        else {
 117                msg_type = msg_id_info[msg_id].msg_type;
 118                if (options->strict && msg_type == FSCK_WARN)
 119                        msg_type = FSCK_ERROR;
 120        }
 121
 122        return msg_type;
 123}
 124
 125static int parse_msg_type(const char *str)
 126{
 127        if (!strcmp(str, "error"))
 128                return FSCK_ERROR;
 129        else if (!strcmp(str, "warn"))
 130                return FSCK_WARN;
 131        else
 132                die("Unknown fsck message type: '%s'", str);
 133}
 134
 135int is_valid_msg_type(const char *msg_id, const char *msg_type)
 136{
 137        if (parse_msg_id(msg_id) < 0)
 138                return 0;
 139        parse_msg_type(msg_type);
 140        return 1;
 141}
 142
 143void fsck_set_msg_type(struct fsck_options *options,
 144                const char *msg_id, const char *msg_type)
 145{
 146        int id = parse_msg_id(msg_id), type;
 147
 148        if (id < 0)
 149                die("Unhandled message id: %s", msg_id);
 150        type = parse_msg_type(msg_type);
 151
 152        if (!options->msg_type) {
 153                int i;
 154                int *msg_type = xmalloc(sizeof(int) * FSCK_MSG_MAX);
 155                for (i = 0; i < FSCK_MSG_MAX; i++)
 156                        msg_type[i] = fsck_msg_type(i, options);
 157                options->msg_type = msg_type;
 158        }
 159
 160        options->msg_type[id] = type;
 161}
 162
 163void fsck_set_msg_types(struct fsck_options *options, const char *values)
 164{
 165        char *buf = xstrdup(values), *to_free = buf;
 166        int done = 0;
 167
 168        while (!done) {
 169                int len = strcspn(buf, " ,|"), equal;
 170
 171                done = !buf[len];
 172                if (!len) {
 173                        buf++;
 174                        continue;
 175                }
 176                buf[len] = '\0';
 177
 178                for (equal = 0;
 179                     equal < len && buf[equal] != '=' && buf[equal] != ':';
 180                     equal++)
 181                        buf[equal] = tolower(buf[equal]);
 182                buf[equal] = '\0';
 183
 184                if (equal == len)
 185                        die("Missing '=': '%s'", buf);
 186
 187                fsck_set_msg_type(options, buf, buf + equal + 1);
 188                buf += len + 1;
 189        }
 190        free(to_free);
 191}
 192
 193static void append_msg_id(struct strbuf *sb, const char *msg_id)
 194{
 195        for (;;) {
 196                char c = *(msg_id)++;
 197
 198                if (!c)
 199                        break;
 200                if (c != '_')
 201                        strbuf_addch(sb, tolower(c));
 202                else {
 203                        assert(*msg_id);
 204                        strbuf_addch(sb, *(msg_id)++);
 205                }
 206        }
 207
 208        strbuf_addstr(sb, ": ");
 209}
 210
 211__attribute__((format (printf, 4, 5)))
 212static int report(struct fsck_options *options, struct object *object,
 213        enum fsck_msg_id id, const char *fmt, ...)
 214{
 215        va_list ap;
 216        struct strbuf sb = STRBUF_INIT;
 217        int msg_type = fsck_msg_type(id, options), result;
 218
 219        append_msg_id(&sb, msg_id_info[id].id_string);
 220
 221        va_start(ap, fmt);
 222        strbuf_vaddf(&sb, fmt, ap);
 223        result = options->error_func(object, msg_type, sb.buf);
 224        strbuf_release(&sb);
 225        va_end(ap);
 226
 227        return result;
 228}
 229
 230static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
 231{
 232        struct tree_desc desc;
 233        struct name_entry entry;
 234        int res = 0;
 235
 236        if (parse_tree(tree))
 237                return -1;
 238
 239        init_tree_desc(&desc, tree->buffer, tree->size);
 240        while (tree_entry(&desc, &entry)) {
 241                int result;
 242
 243                if (S_ISGITLINK(entry.mode))
 244                        continue;
 245                if (S_ISDIR(entry.mode))
 246                        result = options->walk(&lookup_tree(entry.sha1)->object, OBJ_TREE, data, options);
 247                else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode))
 248                        result = options->walk(&lookup_blob(entry.sha1)->object, OBJ_BLOB, data, options);
 249                else {
 250                        result = error("in tree %s: entry %s has bad mode %.6o",
 251                                        sha1_to_hex(tree->object.sha1), entry.path, entry.mode);
 252                }
 253                if (result < 0)
 254                        return result;
 255                if (!res)
 256                        res = result;
 257        }
 258        return res;
 259}
 260
 261static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
 262{
 263        struct commit_list *parents;
 264        int res;
 265        int result;
 266
 267        if (parse_commit(commit))
 268                return -1;
 269
 270        result = options->walk((struct object *)commit->tree, OBJ_TREE, data, options);
 271        if (result < 0)
 272                return result;
 273        res = result;
 274
 275        parents = commit->parents;
 276        while (parents) {
 277                result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
 278                if (result < 0)
 279                        return result;
 280                if (!res)
 281                        res = result;
 282                parents = parents->next;
 283        }
 284        return res;
 285}
 286
 287static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
 288{
 289        if (parse_tag(tag))
 290                return -1;
 291        return options->walk(tag->tagged, OBJ_ANY, data, options);
 292}
 293
 294int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
 295{
 296        if (!obj)
 297                return -1;
 298        switch (obj->type) {
 299        case OBJ_BLOB:
 300                return 0;
 301        case OBJ_TREE:
 302                return fsck_walk_tree((struct tree *)obj, data, options);
 303        case OBJ_COMMIT:
 304                return fsck_walk_commit((struct commit *)obj, data, options);
 305        case OBJ_TAG:
 306                return fsck_walk_tag((struct tag *)obj, data, options);
 307        default:
 308                error("Unknown object type for %s", sha1_to_hex(obj->sha1));
 309                return -1;
 310        }
 311}
 312
 313/*
 314 * The entries in a tree are ordered in the _path_ order,
 315 * which means that a directory entry is ordered by adding
 316 * a slash to the end of it.
 317 *
 318 * So a directory called "a" is ordered _after_ a file
 319 * called "a.c", because "a/" sorts after "a.c".
 320 */
 321#define TREE_UNORDERED (-1)
 322#define TREE_HAS_DUPS  (-2)
 323
 324static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
 325{
 326        int len1 = strlen(name1);
 327        int len2 = strlen(name2);
 328        int len = len1 < len2 ? len1 : len2;
 329        unsigned char c1, c2;
 330        int cmp;
 331
 332        cmp = memcmp(name1, name2, len);
 333        if (cmp < 0)
 334                return 0;
 335        if (cmp > 0)
 336                return TREE_UNORDERED;
 337
 338        /*
 339         * Ok, the first <len> characters are the same.
 340         * Now we need to order the next one, but turn
 341         * a '\0' into a '/' for a directory entry.
 342         */
 343        c1 = name1[len];
 344        c2 = name2[len];
 345        if (!c1 && !c2)
 346                /*
 347                 * git-write-tree used to write out a nonsense tree that has
 348                 * entries with the same name, one blob and one tree.  Make
 349                 * sure we do not have duplicate entries.
 350                 */
 351                return TREE_HAS_DUPS;
 352        if (!c1 && S_ISDIR(mode1))
 353                c1 = '/';
 354        if (!c2 && S_ISDIR(mode2))
 355                c2 = '/';
 356        return c1 < c2 ? 0 : TREE_UNORDERED;
 357}
 358
 359static int fsck_tree(struct tree *item, struct fsck_options *options)
 360{
 361        int retval;
 362        int has_null_sha1 = 0;
 363        int has_full_path = 0;
 364        int has_empty_name = 0;
 365        int has_dot = 0;
 366        int has_dotdot = 0;
 367        int has_dotgit = 0;
 368        int has_zero_pad = 0;
 369        int has_bad_modes = 0;
 370        int has_dup_entries = 0;
 371        int not_properly_sorted = 0;
 372        struct tree_desc desc;
 373        unsigned o_mode;
 374        const char *o_name;
 375
 376        init_tree_desc(&desc, item->buffer, item->size);
 377
 378        o_mode = 0;
 379        o_name = NULL;
 380
 381        while (desc.size) {
 382                unsigned mode;
 383                const char *name;
 384                const unsigned char *sha1;
 385
 386                sha1 = tree_entry_extract(&desc, &name, &mode);
 387
 388                has_null_sha1 |= is_null_sha1(sha1);
 389                has_full_path |= !!strchr(name, '/');
 390                has_empty_name |= !*name;
 391                has_dot |= !strcmp(name, ".");
 392                has_dotdot |= !strcmp(name, "..");
 393                has_dotgit |= (!strcmp(name, ".git") ||
 394                               is_hfs_dotgit(name) ||
 395                               is_ntfs_dotgit(name));
 396                has_zero_pad |= *(char *)desc.buffer == '0';
 397                update_tree_entry(&desc);
 398
 399                switch (mode) {
 400                /*
 401                 * Standard modes..
 402                 */
 403                case S_IFREG | 0755:
 404                case S_IFREG | 0644:
 405                case S_IFLNK:
 406                case S_IFDIR:
 407                case S_IFGITLINK:
 408                        break;
 409                /*
 410                 * This is nonstandard, but we had a few of these
 411                 * early on when we honored the full set of mode
 412                 * bits..
 413                 */
 414                case S_IFREG | 0664:
 415                        if (!options->strict)
 416                                break;
 417                default:
 418                        has_bad_modes = 1;
 419                }
 420
 421                if (o_name) {
 422                        switch (verify_ordered(o_mode, o_name, mode, name)) {
 423                        case TREE_UNORDERED:
 424                                not_properly_sorted = 1;
 425                                break;
 426                        case TREE_HAS_DUPS:
 427                                has_dup_entries = 1;
 428                                break;
 429                        default:
 430                                break;
 431                        }
 432                }
 433
 434                o_mode = mode;
 435                o_name = name;
 436        }
 437
 438        retval = 0;
 439        if (has_null_sha1)
 440                retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
 441        if (has_full_path)
 442                retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
 443        if (has_empty_name)
 444                retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
 445        if (has_dot)
 446                retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
 447        if (has_dotdot)
 448                retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
 449        if (has_dotgit)
 450                retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
 451        if (has_zero_pad)
 452                retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
 453        if (has_bad_modes)
 454                retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
 455        if (has_dup_entries)
 456                retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
 457        if (not_properly_sorted)
 458                retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
 459        return retval;
 460}
 461
 462static int require_end_of_header(const void *data, unsigned long size,
 463        struct object *obj, struct fsck_options *options)
 464{
 465        const char *buffer = (const char *)data;
 466        unsigned long i;
 467
 468        for (i = 0; i < size; i++) {
 469                switch (buffer[i]) {
 470                case '\0':
 471                        return report(options, obj,
 472                                FSCK_MSG_NUL_IN_HEADER,
 473                                "unterminated header: NUL at offset %ld", i);
 474                case '\n':
 475                        if (i + 1 < size && buffer[i + 1] == '\n')
 476                                return 0;
 477                }
 478        }
 479
 480        return report(options, obj,
 481                FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
 482}
 483
 484static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
 485{
 486        const char *p = *ident;
 487        char *end;
 488
 489        *ident = strchrnul(*ident, '\n');
 490        if (**ident == '\n')
 491                (*ident)++;
 492
 493        if (*p == '<')
 494                return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 495        p += strcspn(p, "<>\n");
 496        if (*p == '>')
 497                return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
 498        if (*p != '<')
 499                return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
 500        if (p[-1] != ' ')
 501                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 502        p++;
 503        p += strcspn(p, "<>\n");
 504        if (*p != '>')
 505                return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
 506        p++;
 507        if (*p != ' ')
 508                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
 509        p++;
 510        if (*p == '0' && p[1] != ' ')
 511                return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
 512        if (date_overflows(strtoul(p, &end, 10)))
 513                return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
 514        if ((end == p || *end != ' '))
 515                return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
 516        p = end + 1;
 517        if ((*p != '+' && *p != '-') ||
 518            !isdigit(p[1]) ||
 519            !isdigit(p[2]) ||
 520            !isdigit(p[3]) ||
 521            !isdigit(p[4]) ||
 522            (p[5] != '\n'))
 523                return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
 524        p += 6;
 525        return 0;
 526}
 527
 528static int fsck_commit_buffer(struct commit *commit, const char *buffer,
 529        unsigned long size, struct fsck_options *options)
 530{
 531        unsigned char tree_sha1[20], sha1[20];
 532        struct commit_graft *graft;
 533        unsigned parent_count, parent_line_count = 0, author_count;
 534        int err;
 535
 536        if (require_end_of_header(buffer, size, &commit->object, options))
 537                return -1;
 538
 539        if (!skip_prefix(buffer, "tree ", &buffer))
 540                return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
 541        if (get_sha1_hex(buffer, tree_sha1) || buffer[40] != '\n') {
 542                err = report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
 543                if (err)
 544                        return err;
 545        }
 546        buffer += 41;
 547        while (skip_prefix(buffer, "parent ", &buffer)) {
 548                if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
 549                        err = report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
 550                        if (err)
 551                                return err;
 552                }
 553                buffer += 41;
 554                parent_line_count++;
 555        }
 556        graft = lookup_commit_graft(commit->object.sha1);
 557        parent_count = commit_list_count(commit->parents);
 558        if (graft) {
 559                if (graft->nr_parent == -1 && !parent_count)
 560                        ; /* shallow commit */
 561                else if (graft->nr_parent != parent_count) {
 562                        err = report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
 563                        if (err)
 564                                return err;
 565                }
 566        } else {
 567                if (parent_count != parent_line_count) {
 568                        err = report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
 569                        if (err)
 570                                return err;
 571                }
 572        }
 573        author_count = 0;
 574        while (skip_prefix(buffer, "author ", &buffer)) {
 575                author_count++;
 576                err = fsck_ident(&buffer, &commit->object, options);
 577                if (err)
 578                        return err;
 579        }
 580        if (author_count < 1)
 581                err = report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
 582        else if (author_count > 1)
 583                err = report(options, &commit->object, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
 584        if (err)
 585                return err;
 586        if (!skip_prefix(buffer, "committer ", &buffer))
 587                return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
 588        err = fsck_ident(&buffer, &commit->object, options);
 589        if (err)
 590                return err;
 591        if (!commit->tree)
 592                return report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
 593
 594        return 0;
 595}
 596
 597static int fsck_commit(struct commit *commit, const char *data,
 598        unsigned long size, struct fsck_options *options)
 599{
 600        const char *buffer = data ?  data : get_commit_buffer(commit, &size);
 601        int ret = fsck_commit_buffer(commit, buffer, size, options);
 602        if (!data)
 603                unuse_commit_buffer(commit, buffer);
 604        return ret;
 605}
 606
 607static int fsck_tag_buffer(struct tag *tag, const char *data,
 608        unsigned long size, struct fsck_options *options)
 609{
 610        unsigned char sha1[20];
 611        int ret = 0;
 612        const char *buffer;
 613        char *to_free = NULL, *eol;
 614        struct strbuf sb = STRBUF_INIT;
 615
 616        if (data)
 617                buffer = data;
 618        else {
 619                enum object_type type;
 620
 621                buffer = to_free =
 622                        read_sha1_file(tag->object.sha1, &type, &size);
 623                if (!buffer)
 624                        return report(options, &tag->object,
 625                                FSCK_MSG_MISSING_TAG_OBJECT,
 626                                "cannot read tag object");
 627
 628                if (type != OBJ_TAG) {
 629                        ret = report(options, &tag->object,
 630                                FSCK_MSG_TAG_OBJECT_NOT_TAG,
 631                                "expected tag got %s",
 632                            typename(type));
 633                        goto done;
 634                }
 635        }
 636
 637        if (require_end_of_header(buffer, size, &tag->object, options))
 638                goto done;
 639
 640        if (!skip_prefix(buffer, "object ", &buffer)) {
 641                ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
 642                goto done;
 643        }
 644        if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
 645                ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
 646                if (ret)
 647                        goto done;
 648        }
 649        buffer += 41;
 650
 651        if (!skip_prefix(buffer, "type ", &buffer)) {
 652                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
 653                goto done;
 654        }
 655        eol = strchr(buffer, '\n');
 656        if (!eol) {
 657                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
 658                goto done;
 659        }
 660        if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
 661                ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
 662        if (ret)
 663                goto done;
 664        buffer = eol + 1;
 665
 666        if (!skip_prefix(buffer, "tag ", &buffer)) {
 667                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
 668                goto done;
 669        }
 670        eol = strchr(buffer, '\n');
 671        if (!eol) {
 672                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
 673                goto done;
 674        }
 675        strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
 676        if (check_refname_format(sb.buf, 0))
 677                report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
 678                           "invalid 'tag' name: %.*s",
 679                           (int)(eol - buffer), buffer);
 680        buffer = eol + 1;
 681
 682        if (!skip_prefix(buffer, "tagger ", &buffer))
 683                /* early tags do not contain 'tagger' lines; warn only */
 684                report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
 685        else
 686                ret = fsck_ident(&buffer, &tag->object, options);
 687
 688done:
 689        strbuf_release(&sb);
 690        free(to_free);
 691        return ret;
 692}
 693
 694static int fsck_tag(struct tag *tag, const char *data,
 695        unsigned long size, struct fsck_options *options)
 696{
 697        struct object *tagged = tag->tagged;
 698
 699        if (!tagged)
 700                return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
 701
 702        return fsck_tag_buffer(tag, data, size, options);
 703}
 704
 705int fsck_object(struct object *obj, void *data, unsigned long size,
 706        struct fsck_options *options)
 707{
 708        if (!obj)
 709                return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
 710
 711        if (obj->type == OBJ_BLOB)
 712                return 0;
 713        if (obj->type == OBJ_TREE)
 714                return fsck_tree((struct tree *) obj, options);
 715        if (obj->type == OBJ_COMMIT)
 716                return fsck_commit((struct commit *) obj, (const char *) data,
 717                        size, options);
 718        if (obj->type == OBJ_TAG)
 719                return fsck_tag((struct tag *) obj, (const char *) data,
 720                        size, options);
 721
 722        return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
 723                          obj->type);
 724}
 725
 726int fsck_error_function(struct object *obj, int msg_type, const char *message)
 727{
 728        if (msg_type == FSCK_WARN) {
 729                warning("object %s: %s", sha1_to_hex(obj->sha1), message);
 730                return 0;
 731        }
 732        error("object %s: %s", sha1_to_hex(obj->sha1), message);
 733        return 1;
 734}