Andrew's git / gitweb.git / fsck.c
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fsck.con commit index-pack: check .gitmodules files with --strict (73c3f0f)
   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        /* warnings */ \
  67        FUNC(BAD_FILEMODE, WARN) \
  68        FUNC(EMPTY_NAME, WARN) \
  69        FUNC(FULL_PATHNAME, WARN) \
  70        FUNC(HAS_DOT, WARN) \
  71        FUNC(HAS_DOTDOT, WARN) \
  72        FUNC(HAS_DOTGIT, WARN) \
  73        FUNC(NULL_SHA1, WARN) \
  74        FUNC(ZERO_PADDED_FILEMODE, WARN) \
  75        FUNC(NUL_IN_COMMIT, WARN) \
  76        /* infos (reported as warnings, but ignored by default) */ \
  77        FUNC(BAD_TAG_NAME, INFO) \
  78        FUNC(MISSING_TAGGER_ENTRY, INFO)
  79
  80#define MSG_ID(id, msg_type) FSCK_MSG_##id,
  81enum fsck_msg_id {
  82        FOREACH_MSG_ID(MSG_ID)
  83        FSCK_MSG_MAX
  84};
  85#undef MSG_ID
  86
  87#define STR(x) #x
  88#define MSG_ID(id, msg_type) { STR(id), NULL, FSCK_##msg_type },
  89static struct {
  90        const char *id_string;
  91        const char *downcased;
  92        int msg_type;
  93} msg_id_info[FSCK_MSG_MAX + 1] = {
  94        FOREACH_MSG_ID(MSG_ID)
  95        { NULL, NULL, -1 }
  96};
  97#undef MSG_ID
  98
  99static int parse_msg_id(const char *text)
 100{
 101        int i;
 102
 103        if (!msg_id_info[0].downcased) {
 104                /* convert id_string to lower case, without underscores. */
 105                for (i = 0; i < FSCK_MSG_MAX; i++) {
 106                        const char *p = msg_id_info[i].id_string;
 107                        int len = strlen(p);
 108                        char *q = xmalloc(len);
 109
 110                        msg_id_info[i].downcased = q;
 111                        while (*p)
 112                                if (*p == '_')
 113                                        p++;
 114                                else
 115                                        *(q)++ = tolower(*(p)++);
 116                        *q = '\0';
 117                }
 118        }
 119
 120        for (i = 0; i < FSCK_MSG_MAX; i++)
 121                if (!strcmp(text, msg_id_info[i].downcased))
 122                        return i;
 123
 124        return -1;
 125}
 126
 127static int fsck_msg_type(enum fsck_msg_id msg_id,
 128        struct fsck_options *options)
 129{
 130        int msg_type;
 131
 132        assert(msg_id >= 0 && msg_id < FSCK_MSG_MAX);
 133
 134        if (options->msg_type)
 135                msg_type = options->msg_type[msg_id];
 136        else {
 137                msg_type = msg_id_info[msg_id].msg_type;
 138                if (options->strict && msg_type == FSCK_WARN)
 139                        msg_type = FSCK_ERROR;
 140        }
 141
 142        return msg_type;
 143}
 144
 145static void init_skiplist(struct fsck_options *options, const char *path)
 146{
 147        static struct oid_array skiplist = OID_ARRAY_INIT;
 148        int sorted, fd;
 149        char buffer[GIT_MAX_HEXSZ + 1];
 150        struct object_id oid;
 151
 152        if (options->skiplist)
 153                sorted = options->skiplist->sorted;
 154        else {
 155                sorted = 1;
 156                options->skiplist = &skiplist;
 157        }
 158
 159        fd = open(path, O_RDONLY);
 160        if (fd < 0)
 161                die("Could not open skip list: %s", path);
 162        for (;;) {
 163                const char *p;
 164                int result = read_in_full(fd, buffer, sizeof(buffer));
 165                if (result < 0)
 166                        die_errno("Could not read '%s'", path);
 167                if (!result)
 168                        break;
 169                if (parse_oid_hex(buffer, &oid, &p) || *p != '\n')
 170                        die("Invalid SHA-1: %s", buffer);
 171                oid_array_append(&skiplist, &oid);
 172                if (sorted && skiplist.nr > 1 &&
 173                                oidcmp(&skiplist.oid[skiplist.nr - 2],
 174                                       &oid) > 0)
 175                        sorted = 0;
 176        }
 177        close(fd);
 178
 179        if (sorted)
 180                skiplist.sorted = 1;
 181}
 182
 183static int parse_msg_type(const char *str)
 184{
 185        if (!strcmp(str, "error"))
 186                return FSCK_ERROR;
 187        else if (!strcmp(str, "warn"))
 188                return FSCK_WARN;
 189        else if (!strcmp(str, "ignore"))
 190                return FSCK_IGNORE;
 191        else
 192                die("Unknown fsck message type: '%s'", str);
 193}
 194
 195int is_valid_msg_type(const char *msg_id, const char *msg_type)
 196{
 197        if (parse_msg_id(msg_id) < 0)
 198                return 0;
 199        parse_msg_type(msg_type);
 200        return 1;
 201}
 202
 203void fsck_set_msg_type(struct fsck_options *options,
 204                const char *msg_id, const char *msg_type)
 205{
 206        int id = parse_msg_id(msg_id), type;
 207
 208        if (id < 0)
 209                die("Unhandled message id: %s", msg_id);
 210        type = parse_msg_type(msg_type);
 211
 212        if (type != FSCK_ERROR && msg_id_info[id].msg_type == FSCK_FATAL)
 213                die("Cannot demote %s to %s", msg_id, msg_type);
 214
 215        if (!options->msg_type) {
 216                int i;
 217                int *msg_type;
 218                ALLOC_ARRAY(msg_type, FSCK_MSG_MAX);
 219                for (i = 0; i < FSCK_MSG_MAX; i++)
 220                        msg_type[i] = fsck_msg_type(i, options);
 221                options->msg_type = msg_type;
 222        }
 223
 224        options->msg_type[id] = type;
 225}
 226
 227void fsck_set_msg_types(struct fsck_options *options, const char *values)
 228{
 229        char *buf = xstrdup(values), *to_free = buf;
 230        int done = 0;
 231
 232        while (!done) {
 233                int len = strcspn(buf, " ,|"), equal;
 234
 235                done = !buf[len];
 236                if (!len) {
 237                        buf++;
 238                        continue;
 239                }
 240                buf[len] = '\0';
 241
 242                for (equal = 0;
 243                     equal < len && buf[equal] != '=' && buf[equal] != ':';
 244                     equal++)
 245                        buf[equal] = tolower(buf[equal]);
 246                buf[equal] = '\0';
 247
 248                if (!strcmp(buf, "skiplist")) {
 249                        if (equal == len)
 250                                die("skiplist requires a path");
 251                        init_skiplist(options, buf + equal + 1);
 252                        buf += len + 1;
 253                        continue;
 254                }
 255
 256                if (equal == len)
 257                        die("Missing '=': '%s'", buf);
 258
 259                fsck_set_msg_type(options, buf, buf + equal + 1);
 260                buf += len + 1;
 261        }
 262        free(to_free);
 263}
 264
 265static void append_msg_id(struct strbuf *sb, const char *msg_id)
 266{
 267        for (;;) {
 268                char c = *(msg_id)++;
 269
 270                if (!c)
 271                        break;
 272                if (c != '_')
 273                        strbuf_addch(sb, tolower(c));
 274                else {
 275                        assert(*msg_id);
 276                        strbuf_addch(sb, *(msg_id)++);
 277                }
 278        }
 279
 280        strbuf_addstr(sb, ": ");
 281}
 282
 283__attribute__((format (printf, 4, 5)))
 284static int report(struct fsck_options *options, struct object *object,
 285        enum fsck_msg_id id, const char *fmt, ...)
 286{
 287        va_list ap;
 288        struct strbuf sb = STRBUF_INIT;
 289        int msg_type = fsck_msg_type(id, options), result;
 290
 291        if (msg_type == FSCK_IGNORE)
 292                return 0;
 293
 294        if (options->skiplist && object &&
 295                        oid_array_lookup(options->skiplist, &object->oid) >= 0)
 296                return 0;
 297
 298        if (msg_type == FSCK_FATAL)
 299                msg_type = FSCK_ERROR;
 300        else if (msg_type == FSCK_INFO)
 301                msg_type = FSCK_WARN;
 302
 303        append_msg_id(&sb, msg_id_info[id].id_string);
 304
 305        va_start(ap, fmt);
 306        strbuf_vaddf(&sb, fmt, ap);
 307        result = options->error_func(options, object, msg_type, sb.buf);
 308        strbuf_release(&sb);
 309        va_end(ap);
 310
 311        return result;
 312}
 313
 314static char *get_object_name(struct fsck_options *options, struct object *obj)
 315{
 316        if (!options->object_names)
 317                return NULL;
 318        return lookup_decoration(options->object_names, obj);
 319}
 320
 321static void put_object_name(struct fsck_options *options, struct object *obj,
 322        const char *fmt, ...)
 323{
 324        va_list ap;
 325        struct strbuf buf = STRBUF_INIT;
 326        char *existing;
 327
 328        if (!options->object_names)
 329                return;
 330        existing = lookup_decoration(options->object_names, obj);
 331        if (existing)
 332                return;
 333        va_start(ap, fmt);
 334        strbuf_vaddf(&buf, fmt, ap);
 335        add_decoration(options->object_names, obj, strbuf_detach(&buf, NULL));
 336        va_end(ap);
 337}
 338
 339static const char *describe_object(struct fsck_options *o, struct object *obj)
 340{
 341        static struct strbuf buf = STRBUF_INIT;
 342        char *name;
 343
 344        strbuf_reset(&buf);
 345        strbuf_addstr(&buf, oid_to_hex(&obj->oid));
 346        if (o->object_names && (name = lookup_decoration(o->object_names, obj)))
 347                strbuf_addf(&buf, " (%s)", name);
 348
 349        return buf.buf;
 350}
 351
 352static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
 353{
 354        struct tree_desc desc;
 355        struct name_entry entry;
 356        int res = 0;
 357        const char *name;
 358
 359        if (parse_tree(tree))
 360                return -1;
 361
 362        name = get_object_name(options, &tree->object);
 363        if (init_tree_desc_gently(&desc, tree->buffer, tree->size))
 364                return -1;
 365        while (tree_entry_gently(&desc, &entry)) {
 366                struct object *obj;
 367                int result;
 368
 369                if (S_ISGITLINK(entry.mode))
 370                        continue;
 371
 372                if (S_ISDIR(entry.mode)) {
 373                        obj = (struct object *)lookup_tree(entry.oid);
 374                        if (name && obj)
 375                                put_object_name(options, obj, "%s%s/", name,
 376                                        entry.path);
 377                        result = options->walk(obj, OBJ_TREE, data, options);
 378                }
 379                else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
 380                        obj = (struct object *)lookup_blob(entry.oid);
 381                        if (name && obj)
 382                                put_object_name(options, obj, "%s%s", name,
 383                                        entry.path);
 384                        result = options->walk(obj, OBJ_BLOB, data, options);
 385                }
 386                else {
 387                        result = error("in tree %s: entry %s has bad mode %.6o",
 388                                        describe_object(options, &tree->object), entry.path, entry.mode);
 389                }
 390                if (result < 0)
 391                        return result;
 392                if (!res)
 393                        res = result;
 394        }
 395        return res;
 396}
 397
 398static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
 399{
 400        int counter = 0, generation = 0, name_prefix_len = 0;
 401        struct commit_list *parents;
 402        int res;
 403        int result;
 404        const char *name;
 405
 406        if (parse_commit(commit))
 407                return -1;
 408
 409        name = get_object_name(options, &commit->object);
 410        if (name)
 411                put_object_name(options, &commit->tree->object, "%s:", name);
 412
 413        result = options->walk((struct object *)commit->tree, OBJ_TREE, data, options);
 414        if (result < 0)
 415                return result;
 416        res = result;
 417
 418        parents = commit->parents;
 419        if (name && parents) {
 420                int len = strlen(name), power;
 421
 422                if (len && name[len - 1] == '^') {
 423                        generation = 1;
 424                        name_prefix_len = len - 1;
 425                }
 426                else { /* parse ~<generation> suffix */
 427                        for (generation = 0, power = 1;
 428                             len && isdigit(name[len - 1]);
 429                             power *= 10)
 430                                generation += power * (name[--len] - '0');
 431                        if (power > 1 && len && name[len - 1] == '~')
 432                                name_prefix_len = len - 1;
 433                }
 434        }
 435
 436        while (parents) {
 437                if (name) {
 438                        struct object *obj = &parents->item->object;
 439
 440                        if (++counter > 1)
 441                                put_object_name(options, obj, "%s^%d",
 442                                        name, counter);
 443                        else if (generation > 0)
 444                                put_object_name(options, obj, "%.*s~%d",
 445                                        name_prefix_len, name, generation + 1);
 446                        else
 447                                put_object_name(options, obj, "%s^", name);
 448                }
 449                result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
 450                if (result < 0)
 451                        return result;
 452                if (!res)
 453                        res = result;
 454                parents = parents->next;
 455        }
 456        return res;
 457}
 458
 459static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
 460{
 461        char *name = get_object_name(options, &tag->object);
 462
 463        if (parse_tag(tag))
 464                return -1;
 465        if (name)
 466                put_object_name(options, tag->tagged, "%s", name);
 467        return options->walk(tag->tagged, OBJ_ANY, data, options);
 468}
 469
 470int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
 471{
 472        if (!obj)
 473                return -1;
 474
 475        if (obj->type == OBJ_NONE)
 476                parse_object(&obj->oid);
 477
 478        switch (obj->type) {
 479        case OBJ_BLOB:
 480                return 0;
 481        case OBJ_TREE:
 482                return fsck_walk_tree((struct tree *)obj, data, options);
 483        case OBJ_COMMIT:
 484                return fsck_walk_commit((struct commit *)obj, data, options);
 485        case OBJ_TAG:
 486                return fsck_walk_tag((struct tag *)obj, data, options);
 487        default:
 488                error("Unknown object type for %s", describe_object(options, obj));
 489                return -1;
 490        }
 491}
 492
 493/*
 494 * The entries in a tree are ordered in the _path_ order,
 495 * which means that a directory entry is ordered by adding
 496 * a slash to the end of it.
 497 *
 498 * So a directory called "a" is ordered _after_ a file
 499 * called "a.c", because "a/" sorts after "a.c".
 500 */
 501#define TREE_UNORDERED (-1)
 502#define TREE_HAS_DUPS  (-2)
 503
 504static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
 505{
 506        int len1 = strlen(name1);
 507        int len2 = strlen(name2);
 508        int len = len1 < len2 ? len1 : len2;
 509        unsigned char c1, c2;
 510        int cmp;
 511
 512        cmp = memcmp(name1, name2, len);
 513        if (cmp < 0)
 514                return 0;
 515        if (cmp > 0)
 516                return TREE_UNORDERED;
 517
 518        /*
 519         * Ok, the first <len> characters are the same.
 520         * Now we need to order the next one, but turn
 521         * a '\0' into a '/' for a directory entry.
 522         */
 523        c1 = name1[len];
 524        c2 = name2[len];
 525        if (!c1 && !c2)
 526                /*
 527                 * git-write-tree used to write out a nonsense tree that has
 528                 * entries with the same name, one blob and one tree.  Make
 529                 * sure we do not have duplicate entries.
 530                 */
 531                return TREE_HAS_DUPS;
 532        if (!c1 && S_ISDIR(mode1))
 533                c1 = '/';
 534        if (!c2 && S_ISDIR(mode2))
 535                c2 = '/';
 536        return c1 < c2 ? 0 : TREE_UNORDERED;
 537}
 538
 539static int fsck_tree(struct tree *item, struct fsck_options *options)
 540{
 541        int retval = 0;
 542        int has_null_sha1 = 0;
 543        int has_full_path = 0;
 544        int has_empty_name = 0;
 545        int has_dot = 0;
 546        int has_dotdot = 0;
 547        int has_dotgit = 0;
 548        int has_zero_pad = 0;
 549        int has_bad_modes = 0;
 550        int has_dup_entries = 0;
 551        int not_properly_sorted = 0;
 552        struct tree_desc desc;
 553        unsigned o_mode;
 554        const char *o_name;
 555
 556        if (init_tree_desc_gently(&desc, item->buffer, item->size)) {
 557                retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 558                return retval;
 559        }
 560
 561        o_mode = 0;
 562        o_name = NULL;
 563
 564        while (desc.size) {
 565                unsigned mode;
 566                const char *name;
 567                const struct object_id *oid;
 568
 569                oid = tree_entry_extract(&desc, &name, &mode);
 570
 571                has_null_sha1 |= is_null_oid(oid);
 572                has_full_path |= !!strchr(name, '/');
 573                has_empty_name |= !*name;
 574                has_dot |= !strcmp(name, ".");
 575                has_dotdot |= !strcmp(name, "..");
 576                has_dotgit |= is_hfs_dotgit(name) || is_ntfs_dotgit(name);
 577                has_zero_pad |= *(char *)desc.buffer == '0';
 578
 579                if (is_hfs_dotgitmodules(name) || is_ntfs_dotgitmodules(name))
 580                        oidset_insert(&gitmodules_found, oid);
 581
 582                if (update_tree_entry_gently(&desc)) {
 583                        retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 584                        break;
 585                }
 586
 587                switch (mode) {
 588                /*
 589                 * Standard modes..
 590                 */
 591                case S_IFREG | 0755:
 592                case S_IFREG | 0644:
 593                case S_IFLNK:
 594                case S_IFDIR:
 595                case S_IFGITLINK:
 596                        break;
 597                /*
 598                 * This is nonstandard, but we had a few of these
 599                 * early on when we honored the full set of mode
 600                 * bits..
 601                 */
 602                case S_IFREG | 0664:
 603                        if (!options->strict)
 604                                break;
 605                        /* fallthrough */
 606                default:
 607                        has_bad_modes = 1;
 608                }
 609
 610                if (o_name) {
 611                        switch (verify_ordered(o_mode, o_name, mode, name)) {
 612                        case TREE_UNORDERED:
 613                                not_properly_sorted = 1;
 614                                break;
 615                        case TREE_HAS_DUPS:
 616                                has_dup_entries = 1;
 617                                break;
 618                        default:
 619                                break;
 620                        }
 621                }
 622
 623                o_mode = mode;
 624                o_name = name;
 625        }
 626
 627        if (has_null_sha1)
 628                retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
 629        if (has_full_path)
 630                retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
 631        if (has_empty_name)
 632                retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
 633        if (has_dot)
 634                retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
 635        if (has_dotdot)
 636                retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
 637        if (has_dotgit)
 638                retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
 639        if (has_zero_pad)
 640                retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
 641        if (has_bad_modes)
 642                retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
 643        if (has_dup_entries)
 644                retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
 645        if (not_properly_sorted)
 646                retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
 647        return retval;
 648}
 649
 650static int verify_headers(const void *data, unsigned long size,
 651                          struct object *obj, struct fsck_options *options)
 652{
 653        const char *buffer = (const char *)data;
 654        unsigned long i;
 655
 656        for (i = 0; i < size; i++) {
 657                switch (buffer[i]) {
 658                case '\0':
 659                        return report(options, obj,
 660                                FSCK_MSG_NUL_IN_HEADER,
 661                                "unterminated header: NUL at offset %ld", i);
 662                case '\n':
 663                        if (i + 1 < size && buffer[i + 1] == '\n')
 664                                return 0;
 665                }
 666        }
 667
 668        /*
 669         * We did not find double-LF that separates the header
 670         * and the body.  Not having a body is not a crime but
 671         * we do want to see the terminating LF for the last header
 672         * line.
 673         */
 674        if (size && buffer[size - 1] == '\n')
 675                return 0;
 676
 677        return report(options, obj,
 678                FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
 679}
 680
 681static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
 682{
 683        const char *p = *ident;
 684        char *end;
 685
 686        *ident = strchrnul(*ident, '\n');
 687        if (**ident == '\n')
 688                (*ident)++;
 689
 690        if (*p == '<')
 691                return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 692        p += strcspn(p, "<>\n");
 693        if (*p == '>')
 694                return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
 695        if (*p != '<')
 696                return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
 697        if (p[-1] != ' ')
 698                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 699        p++;
 700        p += strcspn(p, "<>\n");
 701        if (*p != '>')
 702                return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
 703        p++;
 704        if (*p != ' ')
 705                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
 706        p++;
 707        if (*p == '0' && p[1] != ' ')
 708                return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
 709        if (date_overflows(parse_timestamp(p, &end, 10)))
 710                return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
 711        if ((end == p || *end != ' '))
 712                return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
 713        p = end + 1;
 714        if ((*p != '+' && *p != '-') ||
 715            !isdigit(p[1]) ||
 716            !isdigit(p[2]) ||
 717            !isdigit(p[3]) ||
 718            !isdigit(p[4]) ||
 719            (p[5] != '\n'))
 720                return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
 721        p += 6;
 722        return 0;
 723}
 724
 725static int fsck_commit_buffer(struct commit *commit, const char *buffer,
 726        unsigned long size, struct fsck_options *options)
 727{
 728        unsigned char tree_sha1[20], sha1[20];
 729        struct commit_graft *graft;
 730        unsigned parent_count, parent_line_count = 0, author_count;
 731        int err;
 732        const char *buffer_begin = buffer;
 733
 734        if (verify_headers(buffer, size, &commit->object, options))
 735                return -1;
 736
 737        if (!skip_prefix(buffer, "tree ", &buffer))
 738                return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
 739        if (get_sha1_hex(buffer, tree_sha1) || buffer[40] != '\n') {
 740                err = report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
 741                if (err)
 742                        return err;
 743        }
 744        buffer += 41;
 745        while (skip_prefix(buffer, "parent ", &buffer)) {
 746                if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
 747                        err = report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
 748                        if (err)
 749                                return err;
 750                }
 751                buffer += 41;
 752                parent_line_count++;
 753        }
 754        graft = lookup_commit_graft(&commit->object.oid);
 755        parent_count = commit_list_count(commit->parents);
 756        if (graft) {
 757                if (graft->nr_parent == -1 && !parent_count)
 758                        ; /* shallow commit */
 759                else if (graft->nr_parent != parent_count) {
 760                        err = report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
 761                        if (err)
 762                                return err;
 763                }
 764        } else {
 765                if (parent_count != parent_line_count) {
 766                        err = report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
 767                        if (err)
 768                                return err;
 769                }
 770        }
 771        author_count = 0;
 772        while (skip_prefix(buffer, "author ", &buffer)) {
 773                author_count++;
 774                err = fsck_ident(&buffer, &commit->object, options);
 775                if (err)
 776                        return err;
 777        }
 778        if (author_count < 1)
 779                err = report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
 780        else if (author_count > 1)
 781                err = report(options, &commit->object, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
 782        if (err)
 783                return err;
 784        if (!skip_prefix(buffer, "committer ", &buffer))
 785                return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
 786        err = fsck_ident(&buffer, &commit->object, options);
 787        if (err)
 788                return err;
 789        if (!commit->tree) {
 790                err = report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
 791                if (err)
 792                        return err;
 793        }
 794        if (memchr(buffer_begin, '\0', size)) {
 795                err = report(options, &commit->object, FSCK_MSG_NUL_IN_COMMIT,
 796                             "NUL byte in the commit object body");
 797                if (err)
 798                        return err;
 799        }
 800        return 0;
 801}
 802
 803static int fsck_commit(struct commit *commit, const char *data,
 804        unsigned long size, struct fsck_options *options)
 805{
 806        const char *buffer = data ?  data : get_commit_buffer(commit, &size);
 807        int ret = fsck_commit_buffer(commit, buffer, size, options);
 808        if (!data)
 809                unuse_commit_buffer(commit, buffer);
 810        return ret;
 811}
 812
 813static int fsck_tag_buffer(struct tag *tag, const char *data,
 814        unsigned long size, struct fsck_options *options)
 815{
 816        unsigned char sha1[20];
 817        int ret = 0;
 818        const char *buffer;
 819        char *to_free = NULL, *eol;
 820        struct strbuf sb = STRBUF_INIT;
 821
 822        if (data)
 823                buffer = data;
 824        else {
 825                enum object_type type;
 826
 827                buffer = to_free =
 828                        read_sha1_file(tag->object.oid.hash, &type, &size);
 829                if (!buffer)
 830                        return report(options, &tag->object,
 831                                FSCK_MSG_MISSING_TAG_OBJECT,
 832                                "cannot read tag object");
 833
 834                if (type != OBJ_TAG) {
 835                        ret = report(options, &tag->object,
 836                                FSCK_MSG_TAG_OBJECT_NOT_TAG,
 837                                "expected tag got %s",
 838                            type_name(type));
 839                        goto done;
 840                }
 841        }
 842
 843        ret = verify_headers(buffer, size, &tag->object, options);
 844        if (ret)
 845                goto done;
 846
 847        if (!skip_prefix(buffer, "object ", &buffer)) {
 848                ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
 849                goto done;
 850        }
 851        if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
 852                ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
 853                if (ret)
 854                        goto done;
 855        }
 856        buffer += 41;
 857
 858        if (!skip_prefix(buffer, "type ", &buffer)) {
 859                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
 860                goto done;
 861        }
 862        eol = strchr(buffer, '\n');
 863        if (!eol) {
 864                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
 865                goto done;
 866        }
 867        if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
 868                ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
 869        if (ret)
 870                goto done;
 871        buffer = eol + 1;
 872
 873        if (!skip_prefix(buffer, "tag ", &buffer)) {
 874                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
 875                goto done;
 876        }
 877        eol = strchr(buffer, '\n');
 878        if (!eol) {
 879                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
 880                goto done;
 881        }
 882        strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
 883        if (check_refname_format(sb.buf, 0)) {
 884                ret = report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
 885                           "invalid 'tag' name: %.*s",
 886                           (int)(eol - buffer), buffer);
 887                if (ret)
 888                        goto done;
 889        }
 890        buffer = eol + 1;
 891
 892        if (!skip_prefix(buffer, "tagger ", &buffer)) {
 893                /* early tags do not contain 'tagger' lines; warn only */
 894                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
 895                if (ret)
 896                        goto done;
 897        }
 898        else
 899                ret = fsck_ident(&buffer, &tag->object, options);
 900
 901done:
 902        strbuf_release(&sb);
 903        free(to_free);
 904        return ret;
 905}
 906
 907static int fsck_tag(struct tag *tag, const char *data,
 908        unsigned long size, struct fsck_options *options)
 909{
 910        struct object *tagged = tag->tagged;
 911
 912        if (!tagged)
 913                return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
 914
 915        return fsck_tag_buffer(tag, data, size, options);
 916}
 917
 918struct fsck_gitmodules_data {
 919        struct object *obj;
 920        struct fsck_options *options;
 921        int ret;
 922};
 923
 924static int fsck_gitmodules_fn(const char *var, const char *value, void *vdata)
 925{
 926        struct fsck_gitmodules_data *data = vdata;
 927        const char *subsection, *key;
 928        int subsection_len;
 929        char *name;
 930
 931        if (parse_config_key(var, "submodule", &subsection, &subsection_len, &key) < 0 ||
 932            !subsection)
 933                return 0;
 934
 935        name = xmemdupz(subsection, subsection_len);
 936        if (check_submodule_name(name) < 0)
 937                data->ret |= report(data->options, data->obj,
 938                                    FSCK_MSG_GITMODULES_NAME,
 939                                    "disallowed submodule name: %s",
 940                                    name);
 941        free(name);
 942
 943        return 0;
 944}
 945
 946static int fsck_blob(struct blob *blob, const char *buf,
 947                     unsigned long size, struct fsck_options *options)
 948{
 949        struct fsck_gitmodules_data data;
 950
 951        if (!oidset_contains(&gitmodules_found, &blob->object.oid))
 952                return 0;
 953        oidset_insert(&gitmodules_done, &blob->object.oid);
 954
 955        if (!buf) {
 956                /*
 957                 * A missing buffer here is a sign that the caller found the
 958                 * blob too gigantic to load into memory. Let's just consider
 959                 * that an error.
 960                 */
 961                return report(options, &blob->object,
 962                              FSCK_MSG_GITMODULES_PARSE,
 963                              ".gitmodules too large to parse");
 964        }
 965
 966        data.obj = &blob->object;
 967        data.options = options;
 968        data.ret = 0;
 969        if (git_config_from_mem(fsck_gitmodules_fn, CONFIG_ORIGIN_BLOB,
 970                                ".gitmodules", buf, size, &data))
 971                data.ret |= report(options, &blob->object,
 972                                   FSCK_MSG_GITMODULES_PARSE,
 973                                   "could not parse gitmodules blob");
 974
 975        return data.ret;
 976}
 977
 978int fsck_object(struct object *obj, void *data, unsigned long size,
 979        struct fsck_options *options)
 980{
 981        if (!obj)
 982                return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
 983
 984        if (obj->type == OBJ_BLOB)
 985                return fsck_blob((struct blob *)obj, data, size, options);
 986        if (obj->type == OBJ_TREE)
 987                return fsck_tree((struct tree *) obj, options);
 988        if (obj->type == OBJ_COMMIT)
 989                return fsck_commit((struct commit *) obj, (const char *) data,
 990                        size, options);
 991        if (obj->type == OBJ_TAG)
 992                return fsck_tag((struct tag *) obj, (const char *) data,
 993                        size, options);
 994
 995        return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
 996                          obj->type);
 997}
 998
 999int fsck_error_function(struct fsck_options *o,
1000        struct object *obj, int msg_type, const char *message)
1001{
1002        if (msg_type == FSCK_WARN) {
1003                warning("object %s: %s", describe_object(o, obj), message);
1004                return 0;
1005        }
1006        error("object %s: %s", describe_object(o, obj), message);
1007        return 1;
1008}
1009
1010int fsck_finish(struct fsck_options *options)
1011{
1012        int ret = 0;
1013        struct oidset_iter iter;
1014        const struct object_id *oid;
1015
1016        oidset_iter_init(&gitmodules_found, &iter);
1017        while ((oid = oidset_iter_next(&iter))) {
1018                struct blob *blob;
1019                enum object_type type;
1020                unsigned long size;
1021                char *buf;
1022
1023                if (oidset_contains(&gitmodules_done, oid))
1024                        continue;
1025
1026                blob = lookup_blob(oid);
1027                if (!blob) {
1028                        ret |= report(options, &blob->object,
1029                                      FSCK_MSG_GITMODULES_BLOB,
1030                                      "non-blob found at .gitmodules");
1031                        continue;
1032                }
1033
1034                buf = read_sha1_file(oid->hash, &type, &size);
1035                if (!buf) {
1036                        if (is_promisor_object(&blob->object.oid))
1037                                continue;
1038                        ret |= report(options, &blob->object,
1039                                      FSCK_MSG_GITMODULES_MISSING,
1040                                      "unable to read .gitmodules blob");
1041                        continue;
1042                }
1043
1044                if (type == OBJ_BLOB)
1045                        ret |= fsck_blob(blob, buf, size, options);
1046                else
1047                        ret |= report(options, &blob->object,
1048                                      FSCK_MSG_GITMODULES_BLOB,
1049                                      "non-blob found at .gitmodules");
1050                free(buf);
1051        }
1052
1053
1054        oidset_clear(&gitmodules_found);
1055        oidset_clear(&gitmodules_done);
1056        return ret;
1057}