Andrew's git - gitweb.git/blob

105b3e7f48ff00793f924983214e008a38b3c6fe
   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#include "sha1-array.h"
  12#include "decorate.h"
  13#include "oidset.h"
  14
  15static struct oidset gitmodules_found = OIDSET_INIT;
  16static struct oidset gitmodules_done = OIDSET_INIT;
  17
  18#define FSCK_FATAL -1
  19#define FSCK_INFO -2
  20
  21#define FOREACH_MSG_ID(FUNC) \
  22        /* fatal errors */ \
  23        FUNC(NUL_IN_HEADER, FATAL) \
  24        FUNC(UNTERMINATED_HEADER, FATAL) \
  25        /* errors */ \
  26        FUNC(BAD_DATE, ERROR) \
  27        FUNC(BAD_DATE_OVERFLOW, ERROR) \
  28        FUNC(BAD_EMAIL, ERROR) \
  29        FUNC(BAD_NAME, ERROR) \
  30        FUNC(BAD_OBJECT_SHA1, ERROR) \
  31        FUNC(BAD_PARENT_SHA1, ERROR) \
  32        FUNC(BAD_TAG_OBJECT, ERROR) \
  33        FUNC(BAD_TIMEZONE, ERROR) \
  34        FUNC(BAD_TREE, ERROR) \
  35        FUNC(BAD_TREE_SHA1, ERROR) \
  36        FUNC(BAD_TYPE, ERROR) \
  37        FUNC(DUPLICATE_ENTRIES, ERROR) \
  38        FUNC(MISSING_AUTHOR, ERROR) \
  39        FUNC(MISSING_COMMITTER, ERROR) \
  40        FUNC(MISSING_EMAIL, ERROR) \
  41        FUNC(MISSING_GRAFT, ERROR) \
  42        FUNC(MISSING_NAME_BEFORE_EMAIL, ERROR) \
  43        FUNC(MISSING_OBJECT, ERROR) \
  44        FUNC(MISSING_PARENT, ERROR) \
  45        FUNC(MISSING_SPACE_BEFORE_DATE, ERROR) \
  46        FUNC(MISSING_SPACE_BEFORE_EMAIL, ERROR) \
  47        FUNC(MISSING_TAG, ERROR) \
  48        FUNC(MISSING_TAG_ENTRY, ERROR) \
  49        FUNC(MISSING_TAG_OBJECT, ERROR) \
  50        FUNC(MISSING_TREE, ERROR) \
  51        FUNC(MISSING_TREE_OBJECT, ERROR) \
  52        FUNC(MISSING_TYPE, ERROR) \
  53        FUNC(MISSING_TYPE_ENTRY, ERROR) \
  54        FUNC(MULTIPLE_AUTHORS, ERROR) \
  55        FUNC(TAG_OBJECT_NOT_TAG, ERROR) \
  56        FUNC(TREE_NOT_SORTED, ERROR) \
  57        FUNC(UNKNOWN_TYPE, ERROR) \
  58        FUNC(ZERO_PADDED_DATE, ERROR) \
  59        FUNC(GITMODULES_MISSING, ERROR) \
  60        FUNC(GITMODULES_BLOB, ERROR) \
  61        /* warnings */ \
  62        FUNC(BAD_FILEMODE, WARN) \
  63        FUNC(EMPTY_NAME, WARN) \
  64        FUNC(FULL_PATHNAME, WARN) \
  65        FUNC(HAS_DOT, WARN) \
  66        FUNC(HAS_DOTDOT, WARN) \
  67        FUNC(HAS_DOTGIT, WARN) \
  68        FUNC(NULL_SHA1, WARN) \
  69        FUNC(ZERO_PADDED_FILEMODE, WARN) \
  70        FUNC(NUL_IN_COMMIT, WARN) \
  71        /* infos (reported as warnings, but ignored by default) */ \
  72        FUNC(BAD_TAG_NAME, INFO) \
  73        FUNC(MISSING_TAGGER_ENTRY, INFO)
  74
  75#define MSG_ID(id, msg_type) FSCK_MSG_##id,
  76enum fsck_msg_id {
  77        FOREACH_MSG_ID(MSG_ID)
  78        FSCK_MSG_MAX
  79};
  80#undef MSG_ID
  81
  82#define STR(x) #x
  83#define MSG_ID(id, msg_type) { STR(id), NULL, FSCK_##msg_type },
  84static struct {
  85        const char *id_string;
  86        const char *downcased;
  87        int msg_type;
  88} msg_id_info[FSCK_MSG_MAX + 1] = {
  89        FOREACH_MSG_ID(MSG_ID)
  90        { NULL, NULL, -1 }
  91};
  92#undef MSG_ID
  93
  94static int parse_msg_id(const char *text)
  95{
  96        int i;
  97
  98        if (!msg_id_info[0].downcased) {
  99                /* convert id_string to lower case, without underscores. */
 100                for (i = 0; i < FSCK_MSG_MAX; i++) {
 101                        const char *p = msg_id_info[i].id_string;
 102                        int len = strlen(p);
 103                        char *q = xmalloc(len);
 104
 105                        msg_id_info[i].downcased = q;
 106                        while (*p)
 107                                if (*p == '_')
 108                                        p++;
 109                                else
 110                                        *(q)++ = tolower(*(p)++);
 111                        *q = '\0';
 112                }
 113        }
 114
 115        for (i = 0; i < FSCK_MSG_MAX; i++)
 116                if (!strcmp(text, msg_id_info[i].downcased))
 117                        return i;
 118
 119        return -1;
 120}
 121
 122static int fsck_msg_type(enum fsck_msg_id msg_id,
 123        struct fsck_options *options)
 124{
 125        int msg_type;
 126
 127        assert(msg_id >= 0 && msg_id < FSCK_MSG_MAX);
 128
 129        if (options->msg_type)
 130                msg_type = options->msg_type[msg_id];
 131        else {
 132                msg_type = msg_id_info[msg_id].msg_type;
 133                if (options->strict && msg_type == FSCK_WARN)
 134                        msg_type = FSCK_ERROR;
 135        }
 136
 137        return msg_type;
 138}
 139
 140static void init_skiplist(struct fsck_options *options, const char *path)
 141{
 142        static struct oid_array skiplist = OID_ARRAY_INIT;
 143        int sorted, fd;
 144        char buffer[GIT_MAX_HEXSZ + 1];
 145        struct object_id oid;
 146
 147        if (options->skiplist)
 148                sorted = options->skiplist->sorted;
 149        else {
 150                sorted = 1;
 151                options->skiplist = &skiplist;
 152        }
 153
 154        fd = open(path, O_RDONLY);
 155        if (fd < 0)
 156                die("Could not open skip list: %s", path);
 157        for (;;) {
 158                const char *p;
 159                int result = read_in_full(fd, buffer, sizeof(buffer));
 160                if (result < 0)
 161                        die_errno("Could not read '%s'", path);
 162                if (!result)
 163                        break;
 164                if (parse_oid_hex(buffer, &oid, &p) || *p != '\n')
 165                        die("Invalid SHA-1: %s", buffer);
 166                oid_array_append(&skiplist, &oid);
 167                if (sorted && skiplist.nr > 1 &&
 168                                oidcmp(&skiplist.oid[skiplist.nr - 2],
 169                                       &oid) > 0)
 170                        sorted = 0;
 171        }
 172        close(fd);
 173
 174        if (sorted)
 175                skiplist.sorted = 1;
 176}
 177
 178static int parse_msg_type(const char *str)
 179{
 180        if (!strcmp(str, "error"))
 181                return FSCK_ERROR;
 182        else if (!strcmp(str, "warn"))
 183                return FSCK_WARN;
 184        else if (!strcmp(str, "ignore"))
 185                return FSCK_IGNORE;
 186        else
 187                die("Unknown fsck message type: '%s'", str);
 188}
 189
 190int is_valid_msg_type(const char *msg_id, const char *msg_type)
 191{
 192        if (parse_msg_id(msg_id) < 0)
 193                return 0;
 194        parse_msg_type(msg_type);
 195        return 1;
 196}
 197
 198void fsck_set_msg_type(struct fsck_options *options,
 199                const char *msg_id, const char *msg_type)
 200{
 201        int id = parse_msg_id(msg_id), type;
 202
 203        if (id < 0)
 204                die("Unhandled message id: %s", msg_id);
 205        type = parse_msg_type(msg_type);
 206
 207        if (type != FSCK_ERROR && msg_id_info[id].msg_type == FSCK_FATAL)
 208                die("Cannot demote %s to %s", msg_id, msg_type);
 209
 210        if (!options->msg_type) {
 211                int i;
 212                int *msg_type;
 213                ALLOC_ARRAY(msg_type, FSCK_MSG_MAX);
 214                for (i = 0; i < FSCK_MSG_MAX; i++)
 215                        msg_type[i] = fsck_msg_type(i, options);
 216                options->msg_type = msg_type;
 217        }
 218
 219        options->msg_type[id] = type;
 220}
 221
 222void fsck_set_msg_types(struct fsck_options *options, const char *values)
 223{
 224        char *buf = xstrdup(values), *to_free = buf;
 225        int done = 0;
 226
 227        while (!done) {
 228                int len = strcspn(buf, " ,|"), equal;
 229
 230                done = !buf[len];
 231                if (!len) {
 232                        buf++;
 233                        continue;
 234                }
 235                buf[len] = '\0';
 236
 237                for (equal = 0;
 238                     equal < len && buf[equal] != '=' && buf[equal] != ':';
 239                     equal++)
 240                        buf[equal] = tolower(buf[equal]);
 241                buf[equal] = '\0';
 242
 243                if (!strcmp(buf, "skiplist")) {
 244                        if (equal == len)
 245                                die("skiplist requires a path");
 246                        init_skiplist(options, buf + equal + 1);
 247                        buf += len + 1;
 248                        continue;
 249                }
 250
 251                if (equal == len)
 252                        die("Missing '=': '%s'", buf);
 253
 254                fsck_set_msg_type(options, buf, buf + equal + 1);
 255                buf += len + 1;
 256        }
 257        free(to_free);
 258}
 259
 260static void append_msg_id(struct strbuf *sb, const char *msg_id)
 261{
 262        for (;;) {
 263                char c = *(msg_id)++;
 264
 265                if (!c)
 266                        break;
 267                if (c != '_')
 268                        strbuf_addch(sb, tolower(c));
 269                else {
 270                        assert(*msg_id);
 271                        strbuf_addch(sb, *(msg_id)++);
 272                }
 273        }
 274
 275        strbuf_addstr(sb, ": ");
 276}
 277
 278__attribute__((format (printf, 4, 5)))
 279static int report(struct fsck_options *options, struct object *object,
 280        enum fsck_msg_id id, const char *fmt, ...)
 281{
 282        va_list ap;
 283        struct strbuf sb = STRBUF_INIT;
 284        int msg_type = fsck_msg_type(id, options), result;
 285
 286        if (msg_type == FSCK_IGNORE)
 287                return 0;
 288
 289        if (options->skiplist && object &&
 290                        oid_array_lookup(options->skiplist, &object->oid) >= 0)
 291                return 0;
 292
 293        if (msg_type == FSCK_FATAL)
 294                msg_type = FSCK_ERROR;
 295        else if (msg_type == FSCK_INFO)
 296                msg_type = FSCK_WARN;
 297
 298        append_msg_id(&sb, msg_id_info[id].id_string);
 299
 300        va_start(ap, fmt);
 301        strbuf_vaddf(&sb, fmt, ap);
 302        result = options->error_func(options, object, msg_type, sb.buf);
 303        strbuf_release(&sb);
 304        va_end(ap);
 305
 306        return result;
 307}
 308
 309static char *get_object_name(struct fsck_options *options, struct object *obj)
 310{
 311        if (!options->object_names)
 312                return NULL;
 313        return lookup_decoration(options->object_names, obj);
 314}
 315
 316static void put_object_name(struct fsck_options *options, struct object *obj,
 317        const char *fmt, ...)
 318{
 319        va_list ap;
 320        struct strbuf buf = STRBUF_INIT;
 321        char *existing;
 322
 323        if (!options->object_names)
 324                return;
 325        existing = lookup_decoration(options->object_names, obj);
 326        if (existing)
 327                return;
 328        va_start(ap, fmt);
 329        strbuf_vaddf(&buf, fmt, ap);
 330        add_decoration(options->object_names, obj, strbuf_detach(&buf, NULL));
 331        va_end(ap);
 332}
 333
 334static const char *describe_object(struct fsck_options *o, struct object *obj)
 335{
 336        static struct strbuf buf = STRBUF_INIT;
 337        char *name;
 338
 339        strbuf_reset(&buf);
 340        strbuf_addstr(&buf, oid_to_hex(&obj->oid));
 341        if (o->object_names && (name = lookup_decoration(o->object_names, obj)))
 342                strbuf_addf(&buf, " (%s)", name);
 343
 344        return buf.buf;
 345}
 346
 347static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
 348{
 349        struct tree_desc desc;
 350        struct name_entry entry;
 351        int res = 0;
 352        const char *name;
 353
 354        if (parse_tree(tree))
 355                return -1;
 356
 357        name = get_object_name(options, &tree->object);
 358        if (init_tree_desc_gently(&desc, tree->buffer, tree->size))
 359                return -1;
 360        while (tree_entry_gently(&desc, &entry)) {
 361                struct object *obj;
 362                int result;
 363
 364                if (S_ISGITLINK(entry.mode))
 365                        continue;
 366
 367                if (S_ISDIR(entry.mode)) {
 368                        obj = (struct object *)lookup_tree(entry.oid);
 369                        if (name && obj)
 370                                put_object_name(options, obj, "%s%s/", name,
 371                                        entry.path);
 372                        result = options->walk(obj, OBJ_TREE, data, options);
 373                }
 374                else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
 375                        obj = (struct object *)lookup_blob(entry.oid);
 376                        if (name && obj)
 377                                put_object_name(options, obj, "%s%s", name,
 378                                        entry.path);
 379                        result = options->walk(obj, OBJ_BLOB, data, options);
 380                }
 381                else {
 382                        result = error("in tree %s: entry %s has bad mode %.6o",
 383                                        describe_object(options, &tree->object), entry.path, entry.mode);
 384                }
 385                if (result < 0)
 386                        return result;
 387                if (!res)
 388                        res = result;
 389        }
 390        return res;
 391}
 392
 393static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
 394{
 395        int counter = 0, generation = 0, name_prefix_len = 0;
 396        struct commit_list *parents;
 397        int res;
 398        int result;
 399        const char *name;
 400
 401        if (parse_commit(commit))
 402                return -1;
 403
 404        name = get_object_name(options, &commit->object);
 405        if (name)
 406                put_object_name(options, &commit->tree->object, "%s:", name);
 407
 408        result = options->walk((struct object *)commit->tree, OBJ_TREE, data, options);
 409        if (result < 0)
 410                return result;
 411        res = result;
 412
 413        parents = commit->parents;
 414        if (name && parents) {
 415                int len = strlen(name), power;
 416
 417                if (len && name[len - 1] == '^') {
 418                        generation = 1;
 419                        name_prefix_len = len - 1;
 420                }
 421                else { /* parse ~<generation> suffix */
 422                        for (generation = 0, power = 1;
 423                             len && isdigit(name[len - 1]);
 424                             power *= 10)
 425                                generation += power * (name[--len] - '0');
 426                        if (power > 1 && len && name[len - 1] == '~')
 427                                name_prefix_len = len - 1;
 428                }
 429        }
 430
 431        while (parents) {
 432                if (name) {
 433                        struct object *obj = &parents->item->object;
 434
 435                        if (++counter > 1)
 436                                put_object_name(options, obj, "%s^%d",
 437                                        name, counter);
 438                        else if (generation > 0)
 439                                put_object_name(options, obj, "%.*s~%d",
 440                                        name_prefix_len, name, generation + 1);
 441                        else
 442                                put_object_name(options, obj, "%s^", name);
 443                }
 444                result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
 445                if (result < 0)
 446                        return result;
 447                if (!res)
 448                        res = result;
 449                parents = parents->next;
 450        }
 451        return res;
 452}
 453
 454static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
 455{
 456        char *name = get_object_name(options, &tag->object);
 457
 458        if (parse_tag(tag))
 459                return -1;
 460        if (name)
 461                put_object_name(options, tag->tagged, "%s", name);
 462        return options->walk(tag->tagged, OBJ_ANY, data, options);
 463}
 464
 465int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
 466{
 467        if (!obj)
 468                return -1;
 469
 470        if (obj->type == OBJ_NONE)
 471                parse_object(&obj->oid);
 472
 473        switch (obj->type) {
 474        case OBJ_BLOB:
 475                return 0;
 476        case OBJ_TREE:
 477                return fsck_walk_tree((struct tree *)obj, data, options);
 478        case OBJ_COMMIT:
 479                return fsck_walk_commit((struct commit *)obj, data, options);
 480        case OBJ_TAG:
 481                return fsck_walk_tag((struct tag *)obj, data, options);
 482        default:
 483                error("Unknown object type for %s", describe_object(options, obj));
 484                return -1;
 485        }
 486}
 487
 488/*
 489 * The entries in a tree are ordered in the _path_ order,
 490 * which means that a directory entry is ordered by adding
 491 * a slash to the end of it.
 492 *
 493 * So a directory called "a" is ordered _after_ a file
 494 * called "a.c", because "a/" sorts after "a.c".
 495 */
 496#define TREE_UNORDERED (-1)
 497#define TREE_HAS_DUPS  (-2)
 498
 499static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
 500{
 501        int len1 = strlen(name1);
 502        int len2 = strlen(name2);
 503        int len = len1 < len2 ? len1 : len2;
 504        unsigned char c1, c2;
 505        int cmp;
 506
 507        cmp = memcmp(name1, name2, len);
 508        if (cmp < 0)
 509                return 0;
 510        if (cmp > 0)
 511                return TREE_UNORDERED;
 512
 513        /*
 514         * Ok, the first <len> characters are the same.
 515         * Now we need to order the next one, but turn
 516         * a '\0' into a '/' for a directory entry.
 517         */
 518        c1 = name1[len];
 519        c2 = name2[len];
 520        if (!c1 && !c2)
 521                /*
 522                 * git-write-tree used to write out a nonsense tree that has
 523                 * entries with the same name, one blob and one tree.  Make
 524                 * sure we do not have duplicate entries.
 525                 */
 526                return TREE_HAS_DUPS;
 527        if (!c1 && S_ISDIR(mode1))
 528                c1 = '/';
 529        if (!c2 && S_ISDIR(mode2))
 530                c2 = '/';
 531        return c1 < c2 ? 0 : TREE_UNORDERED;
 532}
 533
 534static int fsck_tree(struct tree *item, struct fsck_options *options)
 535{
 536        int retval = 0;
 537        int has_null_sha1 = 0;
 538        int has_full_path = 0;
 539        int has_empty_name = 0;
 540        int has_dot = 0;
 541        int has_dotdot = 0;
 542        int has_dotgit = 0;
 543        int has_zero_pad = 0;
 544        int has_bad_modes = 0;
 545        int has_dup_entries = 0;
 546        int not_properly_sorted = 0;
 547        struct tree_desc desc;
 548        unsigned o_mode;
 549        const char *o_name;
 550
 551        if (init_tree_desc_gently(&desc, item->buffer, item->size)) {
 552                retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 553                return retval;
 554        }
 555
 556        o_mode = 0;
 557        o_name = NULL;
 558
 559        while (desc.size) {
 560                unsigned mode;
 561                const char *name;
 562                const struct object_id *oid;
 563
 564                oid = tree_entry_extract(&desc, &name, &mode);
 565
 566                has_null_sha1 |= is_null_oid(oid);
 567                has_full_path |= !!strchr(name, '/');
 568                has_empty_name |= !*name;
 569                has_dot |= !strcmp(name, ".");
 570                has_dotdot |= !strcmp(name, "..");
 571                has_dotgit |= is_hfs_dotgit(name) || is_ntfs_dotgit(name);
 572                has_zero_pad |= *(char *)desc.buffer == '0';
 573
 574                if (is_hfs_dotgitmodules(name) || is_ntfs_dotgitmodules(name))
 575                        oidset_insert(&gitmodules_found, oid);
 576
 577                if (update_tree_entry_gently(&desc)) {
 578                        retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 579                        break;
 580                }
 581
 582                switch (mode) {
 583                /*
 584                 * Standard modes..
 585                 */
 586                case S_IFREG | 0755:
 587                case S_IFREG | 0644:
 588                case S_IFLNK:
 589                case S_IFDIR:
 590                case S_IFGITLINK:
 591                        break;
 592                /*
 593                 * This is nonstandard, but we had a few of these
 594                 * early on when we honored the full set of mode
 595                 * bits..
 596                 */
 597                case S_IFREG | 0664:
 598                        if (!options->strict)
 599                                break;
 600                        /* fallthrough */
 601                default:
 602                        has_bad_modes = 1;
 603                }
 604
 605                if (o_name) {
 606                        switch (verify_ordered(o_mode, o_name, mode, name)) {
 607                        case TREE_UNORDERED:
 608                                not_properly_sorted = 1;
 609                                break;
 610                        case TREE_HAS_DUPS:
 611                                has_dup_entries = 1;
 612                                break;
 613                        default:
 614                                break;
 615                        }
 616                }
 617
 618                o_mode = mode;
 619                o_name = name;
 620        }
 621
 622        if (has_null_sha1)
 623                retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
 624        if (has_full_path)
 625                retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
 626        if (has_empty_name)
 627                retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
 628        if (has_dot)
 629                retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
 630        if (has_dotdot)
 631                retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
 632        if (has_dotgit)
 633                retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
 634        if (has_zero_pad)
 635                retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
 636        if (has_bad_modes)
 637                retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
 638        if (has_dup_entries)
 639                retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
 640        if (not_properly_sorted)
 641                retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
 642        return retval;
 643}
 644
 645static int verify_headers(const void *data, unsigned long size,
 646                          struct object *obj, struct fsck_options *options)
 647{
 648        const char *buffer = (const char *)data;
 649        unsigned long i;
 650
 651        for (i = 0; i < size; i++) {
 652                switch (buffer[i]) {
 653                case '\0':
 654                        return report(options, obj,
 655                                FSCK_MSG_NUL_IN_HEADER,
 656                                "unterminated header: NUL at offset %ld", i);
 657                case '\n':
 658                        if (i + 1 < size && buffer[i + 1] == '\n')
 659                                return 0;
 660                }
 661        }
 662
 663        /*
 664         * We did not find double-LF that separates the header
 665         * and the body.  Not having a body is not a crime but
 666         * we do want to see the terminating LF for the last header
 667         * line.
 668         */
 669        if (size && buffer[size - 1] == '\n')
 670                return 0;
 671
 672        return report(options, obj,
 673                FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
 674}
 675
 676static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
 677{
 678        const char *p = *ident;
 679        char *end;
 680
 681        *ident = strchrnul(*ident, '\n');
 682        if (**ident == '\n')
 683                (*ident)++;
 684
 685        if (*p == '<')
 686                return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 687        p += strcspn(p, "<>\n");
 688        if (*p == '>')
 689                return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
 690        if (*p != '<')
 691                return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
 692        if (p[-1] != ' ')
 693                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 694        p++;
 695        p += strcspn(p, "<>\n");
 696        if (*p != '>')
 697                return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
 698        p++;
 699        if (*p != ' ')
 700                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
 701        p++;
 702        if (*p == '0' && p[1] != ' ')
 703                return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
 704        if (date_overflows(parse_timestamp(p, &end, 10)))
 705                return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
 706        if ((end == p || *end != ' '))
 707                return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
 708        p = end + 1;
 709        if ((*p != '+' && *p != '-') ||
 710            !isdigit(p[1]) ||
 711            !isdigit(p[2]) ||
 712            !isdigit(p[3]) ||
 713            !isdigit(p[4]) ||
 714            (p[5] != '\n'))
 715                return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
 716        p += 6;
 717        return 0;
 718}
 719
 720static int fsck_commit_buffer(struct commit *commit, const char *buffer,
 721        unsigned long size, struct fsck_options *options)
 722{
 723        unsigned char tree_sha1[20], sha1[20];
 724        struct commit_graft *graft;
 725        unsigned parent_count, parent_line_count = 0, author_count;
 726        int err;
 727        const char *buffer_begin = buffer;
 728
 729        if (verify_headers(buffer, size, &commit->object, options))
 730                return -1;
 731
 732        if (!skip_prefix(buffer, "tree ", &buffer))
 733                return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
 734        if (get_sha1_hex(buffer, tree_sha1) || buffer[40] != '\n') {
 735                err = report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
 736                if (err)
 737                        return err;
 738        }
 739        buffer += 41;
 740        while (skip_prefix(buffer, "parent ", &buffer)) {
 741                if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
 742                        err = report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
 743                        if (err)
 744                                return err;
 745                }
 746                buffer += 41;
 747                parent_line_count++;
 748        }
 749        graft = lookup_commit_graft(&commit->object.oid);
 750        parent_count = commit_list_count(commit->parents);
 751        if (graft) {
 752                if (graft->nr_parent == -1 && !parent_count)
 753                        ; /* shallow commit */
 754                else if (graft->nr_parent != parent_count) {
 755                        err = report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
 756                        if (err)
 757                                return err;
 758                }
 759        } else {
 760                if (parent_count != parent_line_count) {
 761                        err = report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
 762                        if (err)
 763                                return err;
 764                }
 765        }
 766        author_count = 0;
 767        while (skip_prefix(buffer, "author ", &buffer)) {
 768                author_count++;
 769                err = fsck_ident(&buffer, &commit->object, options);
 770                if (err)
 771                        return err;
 772        }
 773        if (author_count < 1)
 774                err = report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
 775        else if (author_count > 1)
 776                err = report(options, &commit->object, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
 777        if (err)
 778                return err;
 779        if (!skip_prefix(buffer, "committer ", &buffer))
 780                return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
 781        err = fsck_ident(&buffer, &commit->object, options);
 782        if (err)
 783                return err;
 784        if (!commit->tree) {
 785                err = report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
 786                if (err)
 787                        return err;
 788        }
 789        if (memchr(buffer_begin, '\0', size)) {
 790                err = report(options, &commit->object, FSCK_MSG_NUL_IN_COMMIT,
 791                             "NUL byte in the commit object body");
 792                if (err)
 793                        return err;
 794        }
 795        return 0;
 796}
 797
 798static int fsck_commit(struct commit *commit, const char *data,
 799        unsigned long size, struct fsck_options *options)
 800{
 801        const char *buffer = data ?  data : get_commit_buffer(commit, &size);
 802        int ret = fsck_commit_buffer(commit, buffer, size, options);
 803        if (!data)
 804                unuse_commit_buffer(commit, buffer);
 805        return ret;
 806}
 807
 808static int fsck_tag_buffer(struct tag *tag, const char *data,
 809        unsigned long size, struct fsck_options *options)
 810{
 811        unsigned char sha1[20];
 812        int ret = 0;
 813        const char *buffer;
 814        char *to_free = NULL, *eol;
 815        struct strbuf sb = STRBUF_INIT;
 816
 817        if (data)
 818                buffer = data;
 819        else {
 820                enum object_type type;
 821
 822                buffer = to_free =
 823                        read_sha1_file(tag->object.oid.hash, &type, &size);
 824                if (!buffer)
 825                        return report(options, &tag->object,
 826                                FSCK_MSG_MISSING_TAG_OBJECT,
 827                                "cannot read tag object");
 828
 829                if (type != OBJ_TAG) {
 830                        ret = report(options, &tag->object,
 831                                FSCK_MSG_TAG_OBJECT_NOT_TAG,
 832                                "expected tag got %s",
 833                            type_name(type));
 834                        goto done;
 835                }
 836        }
 837
 838        ret = verify_headers(buffer, size, &tag->object, options);
 839        if (ret)
 840                goto done;
 841
 842        if (!skip_prefix(buffer, "object ", &buffer)) {
 843                ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
 844                goto done;
 845        }
 846        if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
 847                ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
 848                if (ret)
 849                        goto done;
 850        }
 851        buffer += 41;
 852
 853        if (!skip_prefix(buffer, "type ", &buffer)) {
 854                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
 855                goto done;
 856        }
 857        eol = strchr(buffer, '\n');
 858        if (!eol) {
 859                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
 860                goto done;
 861        }
 862        if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
 863                ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
 864        if (ret)
 865                goto done;
 866        buffer = eol + 1;
 867
 868        if (!skip_prefix(buffer, "tag ", &buffer)) {
 869                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
 870                goto done;
 871        }
 872        eol = strchr(buffer, '\n');
 873        if (!eol) {
 874                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
 875                goto done;
 876        }
 877        strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
 878        if (check_refname_format(sb.buf, 0)) {
 879                ret = report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
 880                           "invalid 'tag' name: %.*s",
 881                           (int)(eol - buffer), buffer);
 882                if (ret)
 883                        goto done;
 884        }
 885        buffer = eol + 1;
 886
 887        if (!skip_prefix(buffer, "tagger ", &buffer)) {
 888                /* early tags do not contain 'tagger' lines; warn only */
 889                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
 890                if (ret)
 891                        goto done;
 892        }
 893        else
 894                ret = fsck_ident(&buffer, &tag->object, options);
 895
 896done:
 897        strbuf_release(&sb);
 898        free(to_free);
 899        return ret;
 900}
 901
 902static int fsck_tag(struct tag *tag, const char *data,
 903        unsigned long size, struct fsck_options *options)
 904{
 905        struct object *tagged = tag->tagged;
 906
 907        if (!tagged)
 908                return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
 909
 910        return fsck_tag_buffer(tag, data, size, options);
 911}
 912
 913static int fsck_blob(struct blob *blob, const char *buf,
 914                     unsigned long size, struct fsck_options *options)
 915{
 916        return 0;
 917}
 918
 919int fsck_object(struct object *obj, void *data, unsigned long size,
 920        struct fsck_options *options)
 921{
 922        if (!obj)
 923                return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
 924
 925        if (obj->type == OBJ_BLOB)
 926                return fsck_blob((struct blob *)obj, data, size, options);
 927        if (obj->type == OBJ_TREE)
 928                return fsck_tree((struct tree *) obj, options);
 929        if (obj->type == OBJ_COMMIT)
 930                return fsck_commit((struct commit *) obj, (const char *) data,
 931                        size, options);
 932        if (obj->type == OBJ_TAG)
 933                return fsck_tag((struct tag *) obj, (const char *) data,
 934                        size, options);
 935
 936        return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
 937                          obj->type);
 938}
 939
 940int fsck_error_function(struct fsck_options *o,
 941        struct object *obj, int msg_type, const char *message)
 942{
 943        if (msg_type == FSCK_WARN) {
 944                warning("object %s: %s", describe_object(o, obj), message);
 945                return 0;
 946        }
 947        error("object %s: %s", describe_object(o, obj), message);
 948        return 1;
 949}
 950
 951int fsck_finish(struct fsck_options *options)
 952{
 953        int ret = 0;
 954        struct oidset_iter iter;
 955        const struct object_id *oid;
 956
 957        oidset_iter_init(&gitmodules_found, &iter);
 958        while ((oid = oidset_iter_next(&iter))) {
 959                struct blob *blob;
 960                enum object_type type;
 961                unsigned long size;
 962                char *buf;
 963
 964                if (oidset_contains(&gitmodules_done, oid))
 965                        continue;
 966
 967                blob = lookup_blob(oid);
 968                if (!blob) {
 969                        ret |= report(options, &blob->object,
 970                                      FSCK_MSG_GITMODULES_BLOB,
 971                                      "non-blob found at .gitmodules");
 972                        continue;
 973                }
 974
 975                buf = read_sha1_file(oid->hash, &type, &size);
 976                if (!buf) {
 977                        ret |= report(options, &blob->object,
 978                                      FSCK_MSG_GITMODULES_MISSING,
 979                                      "unable to read .gitmodules blob");
 980                        continue;
 981                }
 982
 983                if (type == OBJ_BLOB)
 984                        ret |= fsck_blob(blob, buf, size, options);
 985                else
 986                        ret |= report(options, &blob->object,
 987                                      FSCK_MSG_GITMODULES_BLOB,
 988                                      "non-blob found at .gitmodules");
 989                free(buf);
 990        }
 991
 992
 993        oidset_clear(&gitmodules_found);
 994        oidset_clear(&gitmodules_done);
 995        return ret;
 996}