Andrew's git / gitweb.git / fsck.c
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fsck.con commit t/lib-git-daemon: fix signal checking (4c2eb06)
   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#include "packfile.h"
  15#include "submodule-config.h"
  16#include "config.h"
  17
  18static struct oidset gitmodules_found = OIDSET_INIT;
  19static struct oidset gitmodules_done = OIDSET_INIT;
  20
  21#define FSCK_FATAL -1
  22#define FSCK_INFO -2
  23
  24#define FOREACH_MSG_ID(FUNC) \
  25        /* fatal errors */ \
  26        FUNC(NUL_IN_HEADER, FATAL) \
  27        FUNC(UNTERMINATED_HEADER, FATAL) \
  28        /* errors */ \
  29        FUNC(BAD_DATE, ERROR) \
  30        FUNC(BAD_DATE_OVERFLOW, ERROR) \
  31        FUNC(BAD_EMAIL, ERROR) \
  32        FUNC(BAD_NAME, ERROR) \
  33        FUNC(BAD_OBJECT_SHA1, ERROR) \
  34        FUNC(BAD_PARENT_SHA1, ERROR) \
  35        FUNC(BAD_TAG_OBJECT, ERROR) \
  36        FUNC(BAD_TIMEZONE, ERROR) \
  37        FUNC(BAD_TREE, ERROR) \
  38        FUNC(BAD_TREE_SHA1, ERROR) \
  39        FUNC(BAD_TYPE, ERROR) \
  40        FUNC(DUPLICATE_ENTRIES, ERROR) \
  41        FUNC(MISSING_AUTHOR, ERROR) \
  42        FUNC(MISSING_COMMITTER, ERROR) \
  43        FUNC(MISSING_EMAIL, ERROR) \
  44        FUNC(MISSING_GRAFT, ERROR) \
  45        FUNC(MISSING_NAME_BEFORE_EMAIL, ERROR) \
  46        FUNC(MISSING_OBJECT, ERROR) \
  47        FUNC(MISSING_PARENT, ERROR) \
  48        FUNC(MISSING_SPACE_BEFORE_DATE, ERROR) \
  49        FUNC(MISSING_SPACE_BEFORE_EMAIL, ERROR) \
  50        FUNC(MISSING_TAG, ERROR) \
  51        FUNC(MISSING_TAG_ENTRY, ERROR) \
  52        FUNC(MISSING_TAG_OBJECT, ERROR) \
  53        FUNC(MISSING_TREE, ERROR) \
  54        FUNC(MISSING_TREE_OBJECT, ERROR) \
  55        FUNC(MISSING_TYPE, ERROR) \
  56        FUNC(MISSING_TYPE_ENTRY, ERROR) \
  57        FUNC(MULTIPLE_AUTHORS, ERROR) \
  58        FUNC(TAG_OBJECT_NOT_TAG, ERROR) \
  59        FUNC(TREE_NOT_SORTED, ERROR) \
  60        FUNC(UNKNOWN_TYPE, ERROR) \
  61        FUNC(ZERO_PADDED_DATE, ERROR) \
  62        FUNC(GITMODULES_MISSING, ERROR) \
  63        FUNC(GITMODULES_BLOB, ERROR) \
  64        FUNC(GITMODULES_PARSE, ERROR) \
  65        FUNC(GITMODULES_NAME, ERROR) \
  66        FUNC(GITMODULES_SYMLINK, ERROR) \
  67        FUNC(GITMODULES_URL, ERROR) \
  68        FUNC(GITMODULES_PATH, ERROR) \
  69        /* warnings */ \
  70        FUNC(BAD_FILEMODE, WARN) \
  71        FUNC(EMPTY_NAME, WARN) \
  72        FUNC(FULL_PATHNAME, WARN) \
  73        FUNC(HAS_DOT, WARN) \
  74        FUNC(HAS_DOTDOT, WARN) \
  75        FUNC(HAS_DOTGIT, WARN) \
  76        FUNC(NULL_SHA1, WARN) \
  77        FUNC(ZERO_PADDED_FILEMODE, WARN) \
  78        FUNC(NUL_IN_COMMIT, WARN) \
  79        /* infos (reported as warnings, but ignored by default) */ \
  80        FUNC(BAD_TAG_NAME, INFO) \
  81        FUNC(MISSING_TAGGER_ENTRY, INFO)
  82
  83#define MSG_ID(id, msg_type) FSCK_MSG_##id,
  84enum fsck_msg_id {
  85        FOREACH_MSG_ID(MSG_ID)
  86        FSCK_MSG_MAX
  87};
  88#undef MSG_ID
  89
  90#define STR(x) #x
  91#define MSG_ID(id, msg_type) { STR(id), NULL, FSCK_##msg_type },
  92static struct {
  93        const char *id_string;
  94        const char *downcased;
  95        int msg_type;
  96} msg_id_info[FSCK_MSG_MAX + 1] = {
  97        FOREACH_MSG_ID(MSG_ID)
  98        { NULL, NULL, -1 }
  99};
 100#undef MSG_ID
 101
 102static int parse_msg_id(const char *text)
 103{
 104        int i;
 105
 106        if (!msg_id_info[0].downcased) {
 107                /* convert id_string to lower case, without underscores. */
 108                for (i = 0; i < FSCK_MSG_MAX; i++) {
 109                        const char *p = msg_id_info[i].id_string;
 110                        int len = strlen(p);
 111                        char *q = xmalloc(len);
 112
 113                        msg_id_info[i].downcased = q;
 114                        while (*p)
 115                                if (*p == '_')
 116                                        p++;
 117                                else
 118                                        *(q)++ = tolower(*(p)++);
 119                        *q = '\0';
 120                }
 121        }
 122
 123        for (i = 0; i < FSCK_MSG_MAX; i++)
 124                if (!strcmp(text, msg_id_info[i].downcased))
 125                        return i;
 126
 127        return -1;
 128}
 129
 130static int fsck_msg_type(enum fsck_msg_id msg_id,
 131        struct fsck_options *options)
 132{
 133        int msg_type;
 134
 135        assert(msg_id >= 0 && msg_id < FSCK_MSG_MAX);
 136
 137        if (options->msg_type)
 138                msg_type = options->msg_type[msg_id];
 139        else {
 140                msg_type = msg_id_info[msg_id].msg_type;
 141                if (options->strict && msg_type == FSCK_WARN)
 142                        msg_type = FSCK_ERROR;
 143        }
 144
 145        return msg_type;
 146}
 147
 148static void init_skiplist(struct fsck_options *options, const char *path)
 149{
 150        static struct oid_array skiplist = OID_ARRAY_INIT;
 151        int sorted, fd;
 152        char buffer[GIT_MAX_HEXSZ + 1];
 153        struct object_id oid;
 154
 155        if (options->skiplist)
 156                sorted = options->skiplist->sorted;
 157        else {
 158                sorted = 1;
 159                options->skiplist = &skiplist;
 160        }
 161
 162        fd = open(path, O_RDONLY);
 163        if (fd < 0)
 164                die("Could not open skip list: %s", path);
 165        for (;;) {
 166                const char *p;
 167                int result = read_in_full(fd, buffer, sizeof(buffer));
 168                if (result < 0)
 169                        die_errno("Could not read '%s'", path);
 170                if (!result)
 171                        break;
 172                if (parse_oid_hex(buffer, &oid, &p) || *p != '\n')
 173                        die("Invalid SHA-1: %s", buffer);
 174                oid_array_append(&skiplist, &oid);
 175                if (sorted && skiplist.nr > 1 &&
 176                                oidcmp(&skiplist.oid[skiplist.nr - 2],
 177                                       &oid) > 0)
 178                        sorted = 0;
 179        }
 180        close(fd);
 181
 182        if (sorted)
 183                skiplist.sorted = 1;
 184}
 185
 186static int parse_msg_type(const char *str)
 187{
 188        if (!strcmp(str, "error"))
 189                return FSCK_ERROR;
 190        else if (!strcmp(str, "warn"))
 191                return FSCK_WARN;
 192        else if (!strcmp(str, "ignore"))
 193                return FSCK_IGNORE;
 194        else
 195                die("Unknown fsck message type: '%s'", str);
 196}
 197
 198int is_valid_msg_type(const char *msg_id, const char *msg_type)
 199{
 200        if (parse_msg_id(msg_id) < 0)
 201                return 0;
 202        parse_msg_type(msg_type);
 203        return 1;
 204}
 205
 206void fsck_set_msg_type(struct fsck_options *options,
 207                const char *msg_id, const char *msg_type)
 208{
 209        int id = parse_msg_id(msg_id), type;
 210
 211        if (id < 0)
 212                die("Unhandled message id: %s", msg_id);
 213        type = parse_msg_type(msg_type);
 214
 215        if (type != FSCK_ERROR && msg_id_info[id].msg_type == FSCK_FATAL)
 216                die("Cannot demote %s to %s", msg_id, msg_type);
 217
 218        if (!options->msg_type) {
 219                int i;
 220                int *msg_type;
 221                ALLOC_ARRAY(msg_type, FSCK_MSG_MAX);
 222                for (i = 0; i < FSCK_MSG_MAX; i++)
 223                        msg_type[i] = fsck_msg_type(i, options);
 224                options->msg_type = msg_type;
 225        }
 226
 227        options->msg_type[id] = type;
 228}
 229
 230void fsck_set_msg_types(struct fsck_options *options, const char *values)
 231{
 232        char *buf = xstrdup(values), *to_free = buf;
 233        int done = 0;
 234
 235        while (!done) {
 236                int len = strcspn(buf, " ,|"), equal;
 237
 238                done = !buf[len];
 239                if (!len) {
 240                        buf++;
 241                        continue;
 242                }
 243                buf[len] = '\0';
 244
 245                for (equal = 0;
 246                     equal < len && buf[equal] != '=' && buf[equal] != ':';
 247                     equal++)
 248                        buf[equal] = tolower(buf[equal]);
 249                buf[equal] = '\0';
 250
 251                if (!strcmp(buf, "skiplist")) {
 252                        if (equal == len)
 253                                die("skiplist requires a path");
 254                        init_skiplist(options, buf + equal + 1);
 255                        buf += len + 1;
 256                        continue;
 257                }
 258
 259                if (equal == len)
 260                        die("Missing '=': '%s'", buf);
 261
 262                fsck_set_msg_type(options, buf, buf + equal + 1);
 263                buf += len + 1;
 264        }
 265        free(to_free);
 266}
 267
 268static void append_msg_id(struct strbuf *sb, const char *msg_id)
 269{
 270        for (;;) {
 271                char c = *(msg_id)++;
 272
 273                if (!c)
 274                        break;
 275                if (c != '_')
 276                        strbuf_addch(sb, tolower(c));
 277                else {
 278                        assert(*msg_id);
 279                        strbuf_addch(sb, *(msg_id)++);
 280                }
 281        }
 282
 283        strbuf_addstr(sb, ": ");
 284}
 285
 286__attribute__((format (printf, 4, 5)))
 287static int report(struct fsck_options *options, struct object *object,
 288        enum fsck_msg_id id, const char *fmt, ...)
 289{
 290        va_list ap;
 291        struct strbuf sb = STRBUF_INIT;
 292        int msg_type = fsck_msg_type(id, options), result;
 293
 294        if (msg_type == FSCK_IGNORE)
 295                return 0;
 296
 297        if (options->skiplist && object &&
 298                        oid_array_lookup(options->skiplist, &object->oid) >= 0)
 299                return 0;
 300
 301        if (msg_type == FSCK_FATAL)
 302                msg_type = FSCK_ERROR;
 303        else if (msg_type == FSCK_INFO)
 304                msg_type = FSCK_WARN;
 305
 306        append_msg_id(&sb, msg_id_info[id].id_string);
 307
 308        va_start(ap, fmt);
 309        strbuf_vaddf(&sb, fmt, ap);
 310        result = options->error_func(options, object, msg_type, sb.buf);
 311        strbuf_release(&sb);
 312        va_end(ap);
 313
 314        return result;
 315}
 316
 317static char *get_object_name(struct fsck_options *options, struct object *obj)
 318{
 319        if (!options->object_names)
 320                return NULL;
 321        return lookup_decoration(options->object_names, obj);
 322}
 323
 324static void put_object_name(struct fsck_options *options, struct object *obj,
 325        const char *fmt, ...)
 326{
 327        va_list ap;
 328        struct strbuf buf = STRBUF_INIT;
 329        char *existing;
 330
 331        if (!options->object_names)
 332                return;
 333        existing = lookup_decoration(options->object_names, obj);
 334        if (existing)
 335                return;
 336        va_start(ap, fmt);
 337        strbuf_vaddf(&buf, fmt, ap);
 338        add_decoration(options->object_names, obj, strbuf_detach(&buf, NULL));
 339        va_end(ap);
 340}
 341
 342static const char *describe_object(struct fsck_options *o, struct object *obj)
 343{
 344        static struct strbuf buf = STRBUF_INIT;
 345        char *name;
 346
 347        strbuf_reset(&buf);
 348        strbuf_addstr(&buf, oid_to_hex(&obj->oid));
 349        if (o->object_names && (name = lookup_decoration(o->object_names, obj)))
 350                strbuf_addf(&buf, " (%s)", name);
 351
 352        return buf.buf;
 353}
 354
 355static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
 356{
 357        struct tree_desc desc;
 358        struct name_entry entry;
 359        int res = 0;
 360        const char *name;
 361
 362        if (parse_tree(tree))
 363                return -1;
 364
 365        name = get_object_name(options, &tree->object);
 366        if (init_tree_desc_gently(&desc, tree->buffer, tree->size))
 367                return -1;
 368        while (tree_entry_gently(&desc, &entry)) {
 369                struct object *obj;
 370                int result;
 371
 372                if (S_ISGITLINK(entry.mode))
 373                        continue;
 374
 375                if (S_ISDIR(entry.mode)) {
 376                        obj = (struct object *)lookup_tree(entry.oid);
 377                        if (name && obj)
 378                                put_object_name(options, obj, "%s%s/", name,
 379                                        entry.path);
 380                        result = options->walk(obj, OBJ_TREE, data, options);
 381                }
 382                else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
 383                        obj = (struct object *)lookup_blob(entry.oid);
 384                        if (name && obj)
 385                                put_object_name(options, obj, "%s%s", name,
 386                                        entry.path);
 387                        result = options->walk(obj, OBJ_BLOB, data, options);
 388                }
 389                else {
 390                        result = error("in tree %s: entry %s has bad mode %.6o",
 391                                        describe_object(options, &tree->object), entry.path, entry.mode);
 392                }
 393                if (result < 0)
 394                        return result;
 395                if (!res)
 396                        res = result;
 397        }
 398        return res;
 399}
 400
 401static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
 402{
 403        int counter = 0, generation = 0, name_prefix_len = 0;
 404        struct commit_list *parents;
 405        int res;
 406        int result;
 407        const char *name;
 408
 409        if (parse_commit(commit))
 410                return -1;
 411
 412        name = get_object_name(options, &commit->object);
 413        if (name)
 414                put_object_name(options, &get_commit_tree(commit)->object,
 415                                "%s:", name);
 416
 417        result = options->walk((struct object *)get_commit_tree(commit),
 418                               OBJ_TREE, data, options);
 419        if (result < 0)
 420                return result;
 421        res = result;
 422
 423        parents = commit->parents;
 424        if (name && parents) {
 425                int len = strlen(name), power;
 426
 427                if (len && name[len - 1] == '^') {
 428                        generation = 1;
 429                        name_prefix_len = len - 1;
 430                }
 431                else { /* parse ~<generation> suffix */
 432                        for (generation = 0, power = 1;
 433                             len && isdigit(name[len - 1]);
 434                             power *= 10)
 435                                generation += power * (name[--len] - '0');
 436                        if (power > 1 && len && name[len - 1] == '~')
 437                                name_prefix_len = len - 1;
 438                }
 439        }
 440
 441        while (parents) {
 442                if (name) {
 443                        struct object *obj = &parents->item->object;
 444
 445                        if (++counter > 1)
 446                                put_object_name(options, obj, "%s^%d",
 447                                        name, counter);
 448                        else if (generation > 0)
 449                                put_object_name(options, obj, "%.*s~%d",
 450                                        name_prefix_len, name, generation + 1);
 451                        else
 452                                put_object_name(options, obj, "%s^", name);
 453                }
 454                result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
 455                if (result < 0)
 456                        return result;
 457                if (!res)
 458                        res = result;
 459                parents = parents->next;
 460        }
 461        return res;
 462}
 463
 464static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
 465{
 466        char *name = get_object_name(options, &tag->object);
 467
 468        if (parse_tag(tag))
 469                return -1;
 470        if (name)
 471                put_object_name(options, tag->tagged, "%s", name);
 472        return options->walk(tag->tagged, OBJ_ANY, data, options);
 473}
 474
 475int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
 476{
 477        if (!obj)
 478                return -1;
 479
 480        if (obj->type == OBJ_NONE)
 481                parse_object(&obj->oid);
 482
 483        switch (obj->type) {
 484        case OBJ_BLOB:
 485                return 0;
 486        case OBJ_TREE:
 487                return fsck_walk_tree((struct tree *)obj, data, options);
 488        case OBJ_COMMIT:
 489                return fsck_walk_commit((struct commit *)obj, data, options);
 490        case OBJ_TAG:
 491                return fsck_walk_tag((struct tag *)obj, data, options);
 492        default:
 493                error("Unknown object type for %s", describe_object(options, obj));
 494                return -1;
 495        }
 496}
 497
 498/*
 499 * The entries in a tree are ordered in the _path_ order,
 500 * which means that a directory entry is ordered by adding
 501 * a slash to the end of it.
 502 *
 503 * So a directory called "a" is ordered _after_ a file
 504 * called "a.c", because "a/" sorts after "a.c".
 505 */
 506#define TREE_UNORDERED (-1)
 507#define TREE_HAS_DUPS  (-2)
 508
 509static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
 510{
 511        int len1 = strlen(name1);
 512        int len2 = strlen(name2);
 513        int len = len1 < len2 ? len1 : len2;
 514        unsigned char c1, c2;
 515        int cmp;
 516
 517        cmp = memcmp(name1, name2, len);
 518        if (cmp < 0)
 519                return 0;
 520        if (cmp > 0)
 521                return TREE_UNORDERED;
 522
 523        /*
 524         * Ok, the first <len> characters are the same.
 525         * Now we need to order the next one, but turn
 526         * a '\0' into a '/' for a directory entry.
 527         */
 528        c1 = name1[len];
 529        c2 = name2[len];
 530        if (!c1 && !c2)
 531                /*
 532                 * git-write-tree used to write out a nonsense tree that has
 533                 * entries with the same name, one blob and one tree.  Make
 534                 * sure we do not have duplicate entries.
 535                 */
 536                return TREE_HAS_DUPS;
 537        if (!c1 && S_ISDIR(mode1))
 538                c1 = '/';
 539        if (!c2 && S_ISDIR(mode2))
 540                c2 = '/';
 541        return c1 < c2 ? 0 : TREE_UNORDERED;
 542}
 543
 544static int fsck_tree(struct tree *item, struct fsck_options *options)
 545{
 546        int retval = 0;
 547        int has_null_sha1 = 0;
 548        int has_full_path = 0;
 549        int has_empty_name = 0;
 550        int has_dot = 0;
 551        int has_dotdot = 0;
 552        int has_dotgit = 0;
 553        int has_zero_pad = 0;
 554        int has_bad_modes = 0;
 555        int has_dup_entries = 0;
 556        int not_properly_sorted = 0;
 557        struct tree_desc desc;
 558        unsigned o_mode;
 559        const char *o_name;
 560
 561        if (init_tree_desc_gently(&desc, item->buffer, item->size)) {
 562                retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 563                return retval;
 564        }
 565
 566        o_mode = 0;
 567        o_name = NULL;
 568
 569        while (desc.size) {
 570                unsigned mode;
 571                const char *name;
 572                const struct object_id *oid;
 573
 574                oid = tree_entry_extract(&desc, &name, &mode);
 575
 576                has_null_sha1 |= is_null_oid(oid);
 577                has_full_path |= !!strchr(name, '/');
 578                has_empty_name |= !*name;
 579                has_dot |= !strcmp(name, ".");
 580                has_dotdot |= !strcmp(name, "..");
 581                has_dotgit |= is_hfs_dotgit(name) || is_ntfs_dotgit(name);
 582                has_zero_pad |= *(char *)desc.buffer == '0';
 583
 584                if (is_hfs_dotgitmodules(name) || is_ntfs_dotgitmodules(name)) {
 585                        if (!S_ISLNK(mode))
 586                                oidset_insert(&gitmodules_found, oid);
 587                        else
 588                                retval += report(options, &item->object,
 589                                                 FSCK_MSG_GITMODULES_SYMLINK,
 590                                                 ".gitmodules is a symbolic link");
 591                }
 592
 593                if (update_tree_entry_gently(&desc)) {
 594                        retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 595                        break;
 596                }
 597
 598                switch (mode) {
 599                /*
 600                 * Standard modes..
 601                 */
 602                case S_IFREG | 0755:
 603                case S_IFREG | 0644:
 604                case S_IFLNK:
 605                case S_IFDIR:
 606                case S_IFGITLINK:
 607                        break;
 608                /*
 609                 * This is nonstandard, but we had a few of these
 610                 * early on when we honored the full set of mode
 611                 * bits..
 612                 */
 613                case S_IFREG | 0664:
 614                        if (!options->strict)
 615                                break;
 616                        /* fallthrough */
 617                default:
 618                        has_bad_modes = 1;
 619                }
 620
 621                if (o_name) {
 622                        switch (verify_ordered(o_mode, o_name, mode, name)) {
 623                        case TREE_UNORDERED:
 624                                not_properly_sorted = 1;
 625                                break;
 626                        case TREE_HAS_DUPS:
 627                                has_dup_entries = 1;
 628                                break;
 629                        default:
 630                                break;
 631                        }
 632                }
 633
 634                o_mode = mode;
 635                o_name = name;
 636        }
 637
 638        if (has_null_sha1)
 639                retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
 640        if (has_full_path)
 641                retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
 642        if (has_empty_name)
 643                retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
 644        if (has_dot)
 645                retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
 646        if (has_dotdot)
 647                retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
 648        if (has_dotgit)
 649                retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
 650        if (has_zero_pad)
 651                retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
 652        if (has_bad_modes)
 653                retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
 654        if (has_dup_entries)
 655                retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
 656        if (not_properly_sorted)
 657                retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
 658        return retval;
 659}
 660
 661static int verify_headers(const void *data, unsigned long size,
 662                          struct object *obj, struct fsck_options *options)
 663{
 664        const char *buffer = (const char *)data;
 665        unsigned long i;
 666
 667        for (i = 0; i < size; i++) {
 668                switch (buffer[i]) {
 669                case '\0':
 670                        return report(options, obj,
 671                                FSCK_MSG_NUL_IN_HEADER,
 672                                "unterminated header: NUL at offset %ld", i);
 673                case '\n':
 674                        if (i + 1 < size && buffer[i + 1] == '\n')
 675                                return 0;
 676                }
 677        }
 678
 679        /*
 680         * We did not find double-LF that separates the header
 681         * and the body.  Not having a body is not a crime but
 682         * we do want to see the terminating LF for the last header
 683         * line.
 684         */
 685        if (size && buffer[size - 1] == '\n')
 686                return 0;
 687
 688        return report(options, obj,
 689                FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
 690}
 691
 692static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
 693{
 694        const char *p = *ident;
 695        char *end;
 696
 697        *ident = strchrnul(*ident, '\n');
 698        if (**ident == '\n')
 699                (*ident)++;
 700
 701        if (*p == '<')
 702                return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 703        p += strcspn(p, "<>\n");
 704        if (*p == '>')
 705                return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
 706        if (*p != '<')
 707                return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
 708        if (p[-1] != ' ')
 709                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 710        p++;
 711        p += strcspn(p, "<>\n");
 712        if (*p != '>')
 713                return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
 714        p++;
 715        if (*p != ' ')
 716                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
 717        p++;
 718        if (*p == '0' && p[1] != ' ')
 719                return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
 720        if (date_overflows(parse_timestamp(p, &end, 10)))
 721                return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
 722        if ((end == p || *end != ' '))
 723                return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
 724        p = end + 1;
 725        if ((*p != '+' && *p != '-') ||
 726            !isdigit(p[1]) ||
 727            !isdigit(p[2]) ||
 728            !isdigit(p[3]) ||
 729            !isdigit(p[4]) ||
 730            (p[5] != '\n'))
 731                return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
 732        p += 6;
 733        return 0;
 734}
 735
 736static int fsck_commit_buffer(struct commit *commit, const char *buffer,
 737        unsigned long size, struct fsck_options *options)
 738{
 739        struct object_id tree_oid, oid;
 740        struct commit_graft *graft;
 741        unsigned parent_count, parent_line_count = 0, author_count;
 742        int err;
 743        const char *buffer_begin = buffer;
 744        const char *p;
 745
 746        if (verify_headers(buffer, size, &commit->object, options))
 747                return -1;
 748
 749        if (!skip_prefix(buffer, "tree ", &buffer))
 750                return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
 751        if (parse_oid_hex(buffer, &tree_oid, &p) || *p != '\n') {
 752                err = report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
 753                if (err)
 754                        return err;
 755        }
 756        buffer = p + 1;
 757        while (skip_prefix(buffer, "parent ", &buffer)) {
 758                if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
 759                        err = report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
 760                        if (err)
 761                                return err;
 762                }
 763                buffer = p + 1;
 764                parent_line_count++;
 765        }
 766        graft = lookup_commit_graft(&commit->object.oid);
 767        parent_count = commit_list_count(commit->parents);
 768        if (graft) {
 769                if (graft->nr_parent == -1 && !parent_count)
 770                        ; /* shallow commit */
 771                else if (graft->nr_parent != parent_count) {
 772                        err = report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
 773                        if (err)
 774                                return err;
 775                }
 776        } else {
 777                if (parent_count != parent_line_count) {
 778                        err = report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
 779                        if (err)
 780                                return err;
 781                }
 782        }
 783        author_count = 0;
 784        while (skip_prefix(buffer, "author ", &buffer)) {
 785                author_count++;
 786                err = fsck_ident(&buffer, &commit->object, options);
 787                if (err)
 788                        return err;
 789        }
 790        if (author_count < 1)
 791                err = report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
 792        else if (author_count > 1)
 793                err = report(options, &commit->object, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
 794        if (err)
 795                return err;
 796        if (!skip_prefix(buffer, "committer ", &buffer))
 797                return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
 798        err = fsck_ident(&buffer, &commit->object, options);
 799        if (err)
 800                return err;
 801        if (!get_commit_tree(commit)) {
 802                err = report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", oid_to_hex(&tree_oid));
 803                if (err)
 804                        return err;
 805        }
 806        if (memchr(buffer_begin, '\0', size)) {
 807                err = report(options, &commit->object, FSCK_MSG_NUL_IN_COMMIT,
 808                             "NUL byte in the commit object body");
 809                if (err)
 810                        return err;
 811        }
 812        return 0;
 813}
 814
 815static int fsck_commit(struct commit *commit, const char *data,
 816        unsigned long size, struct fsck_options *options)
 817{
 818        const char *buffer = data ?  data : get_commit_buffer(commit, &size);
 819        int ret = fsck_commit_buffer(commit, buffer, size, options);
 820        if (!data)
 821                unuse_commit_buffer(commit, buffer);
 822        return ret;
 823}
 824
 825static int fsck_tag_buffer(struct tag *tag, const char *data,
 826        unsigned long size, struct fsck_options *options)
 827{
 828        struct object_id oid;
 829        int ret = 0;
 830        const char *buffer;
 831        char *to_free = NULL, *eol;
 832        struct strbuf sb = STRBUF_INIT;
 833        const char *p;
 834
 835        if (data)
 836                buffer = data;
 837        else {
 838                enum object_type type;
 839
 840                buffer = to_free =
 841                        read_object_file(&tag->object.oid, &type, &size);
 842                if (!buffer)
 843                        return report(options, &tag->object,
 844                                FSCK_MSG_MISSING_TAG_OBJECT,
 845                                "cannot read tag object");
 846
 847                if (type != OBJ_TAG) {
 848                        ret = report(options, &tag->object,
 849                                FSCK_MSG_TAG_OBJECT_NOT_TAG,
 850                                "expected tag got %s",
 851                            type_name(type));
 852                        goto done;
 853                }
 854        }
 855
 856        ret = verify_headers(buffer, size, &tag->object, options);
 857        if (ret)
 858                goto done;
 859
 860        if (!skip_prefix(buffer, "object ", &buffer)) {
 861                ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
 862                goto done;
 863        }
 864        if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
 865                ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
 866                if (ret)
 867                        goto done;
 868        }
 869        buffer = p + 1;
 870
 871        if (!skip_prefix(buffer, "type ", &buffer)) {
 872                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
 873                goto done;
 874        }
 875        eol = strchr(buffer, '\n');
 876        if (!eol) {
 877                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
 878                goto done;
 879        }
 880        if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
 881                ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
 882        if (ret)
 883                goto done;
 884        buffer = eol + 1;
 885
 886        if (!skip_prefix(buffer, "tag ", &buffer)) {
 887                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
 888                goto done;
 889        }
 890        eol = strchr(buffer, '\n');
 891        if (!eol) {
 892                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
 893                goto done;
 894        }
 895        strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
 896        if (check_refname_format(sb.buf, 0)) {
 897                ret = report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
 898                           "invalid 'tag' name: %.*s",
 899                           (int)(eol - buffer), buffer);
 900                if (ret)
 901                        goto done;
 902        }
 903        buffer = eol + 1;
 904
 905        if (!skip_prefix(buffer, "tagger ", &buffer)) {
 906                /* early tags do not contain 'tagger' lines; warn only */
 907                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
 908                if (ret)
 909                        goto done;
 910        }
 911        else
 912                ret = fsck_ident(&buffer, &tag->object, options);
 913
 914done:
 915        strbuf_release(&sb);
 916        free(to_free);
 917        return ret;
 918}
 919
 920static int fsck_tag(struct tag *tag, const char *data,
 921        unsigned long size, struct fsck_options *options)
 922{
 923        struct object *tagged = tag->tagged;
 924
 925        if (!tagged)
 926                return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
 927
 928        return fsck_tag_buffer(tag, data, size, options);
 929}
 930
 931struct fsck_gitmodules_data {
 932        struct object *obj;
 933        struct fsck_options *options;
 934        int ret;
 935};
 936
 937static int fsck_gitmodules_fn(const char *var, const char *value, void *vdata)
 938{
 939        struct fsck_gitmodules_data *data = vdata;
 940        const char *subsection, *key;
 941        int subsection_len;
 942        char *name;
 943
 944        if (parse_config_key(var, "submodule", &subsection, &subsection_len, &key) < 0 ||
 945            !subsection)
 946                return 0;
 947
 948        name = xmemdupz(subsection, subsection_len);
 949        if (check_submodule_name(name) < 0)
 950                data->ret |= report(data->options, data->obj,
 951                                    FSCK_MSG_GITMODULES_NAME,
 952                                    "disallowed submodule name: %s",
 953                                    name);
 954        if (!strcmp(key, "url") && value &&
 955            looks_like_command_line_option(value))
 956                data->ret |= report(data->options, data->obj,
 957                                    FSCK_MSG_GITMODULES_URL,
 958                                    "disallowed submodule url: %s",
 959                                    value);
 960        if (!strcmp(key, "path") && value &&
 961            looks_like_command_line_option(value))
 962                data->ret |= report(data->options, data->obj,
 963                                    FSCK_MSG_GITMODULES_PATH,
 964                                    "disallowed submodule path: %s",
 965                                    value);
 966        free(name);
 967
 968        return 0;
 969}
 970
 971static int fsck_blob(struct blob *blob, const char *buf,
 972                     unsigned long size, struct fsck_options *options)
 973{
 974        struct fsck_gitmodules_data data;
 975
 976        if (!oidset_contains(&gitmodules_found, &blob->object.oid))
 977                return 0;
 978        oidset_insert(&gitmodules_done, &blob->object.oid);
 979
 980        if (!buf) {
 981                /*
 982                 * A missing buffer here is a sign that the caller found the
 983                 * blob too gigantic to load into memory. Let's just consider
 984                 * that an error.
 985                 */
 986                return report(options, &blob->object,
 987                              FSCK_MSG_GITMODULES_PARSE,
 988                              ".gitmodules too large to parse");
 989        }
 990
 991        data.obj = &blob->object;
 992        data.options = options;
 993        data.ret = 0;
 994        if (git_config_from_mem(fsck_gitmodules_fn, CONFIG_ORIGIN_BLOB,
 995                                ".gitmodules", buf, size, &data))
 996                data.ret |= report(options, &blob->object,
 997                                   FSCK_MSG_GITMODULES_PARSE,
 998                                   "could not parse gitmodules blob");
 999
1000        return data.ret;
1001}
1002
1003int fsck_object(struct object *obj, void *data, unsigned long size,
1004        struct fsck_options *options)
1005{
1006        if (!obj)
1007                return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
1008
1009        if (obj->type == OBJ_BLOB)
1010                return fsck_blob((struct blob *)obj, data, size, options);
1011        if (obj->type == OBJ_TREE)
1012                return fsck_tree((struct tree *) obj, options);
1013        if (obj->type == OBJ_COMMIT)
1014                return fsck_commit((struct commit *) obj, (const char *) data,
1015                        size, options);
1016        if (obj->type == OBJ_TAG)
1017                return fsck_tag((struct tag *) obj, (const char *) data,
1018                        size, options);
1019
1020        return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
1021                          obj->type);
1022}
1023
1024int fsck_error_function(struct fsck_options *o,
1025        struct object *obj, int msg_type, const char *message)
1026{
1027        if (msg_type == FSCK_WARN) {
1028                warning("object %s: %s", describe_object(o, obj), message);
1029                return 0;
1030        }
1031        error("object %s: %s", describe_object(o, obj), message);
1032        return 1;
1033}
1034
1035int fsck_finish(struct fsck_options *options)
1036{
1037        int ret = 0;
1038        struct oidset_iter iter;
1039        const struct object_id *oid;
1040
1041        oidset_iter_init(&gitmodules_found, &iter);
1042        while ((oid = oidset_iter_next(&iter))) {
1043                struct blob *blob;
1044                enum object_type type;
1045                unsigned long size;
1046                char *buf;
1047
1048                if (oidset_contains(&gitmodules_done, oid))
1049                        continue;
1050
1051                blob = lookup_blob(oid);
1052                if (!blob) {
1053                        struct object *obj = lookup_unknown_object(oid->hash);
1054                        ret |= report(options, obj,
1055                                      FSCK_MSG_GITMODULES_BLOB,
1056                                      "non-blob found at .gitmodules");
1057                        continue;
1058                }
1059
1060                buf = read_object_file(oid, &type, &size);
1061                if (!buf) {
1062                        if (is_promisor_object(&blob->object.oid))
1063                                continue;
1064                        ret |= report(options, &blob->object,
1065                                      FSCK_MSG_GITMODULES_MISSING,
1066                                      "unable to read .gitmodules blob");
1067                        continue;
1068                }
1069
1070                if (type == OBJ_BLOB)
1071                        ret |= fsck_blob(blob, buf, size, options);
1072                else
1073                        ret |= report(options, &blob->object,
1074                                      FSCK_MSG_GITMODULES_BLOB,
1075                                      "non-blob found at .gitmodules");
1076                free(buf);
1077        }
1078
1079
1080        oidset_clear(&gitmodules_found);
1081        oidset_clear(&gitmodules_done);
1082        return ret;
1083}