Andrew's git / gitweb.git / fsck.c
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fsck.con commit Merge branch 'sb/submodule-merge-in-merge-recursive' (0821b73)
   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        /* warnings */ \
  68        FUNC(BAD_FILEMODE, WARN) \
  69        FUNC(EMPTY_NAME, WARN) \
  70        FUNC(FULL_PATHNAME, WARN) \
  71        FUNC(HAS_DOT, WARN) \
  72        FUNC(HAS_DOTDOT, WARN) \
  73        FUNC(HAS_DOTGIT, WARN) \
  74        FUNC(NULL_SHA1, WARN) \
  75        FUNC(ZERO_PADDED_FILEMODE, WARN) \
  76        FUNC(NUL_IN_COMMIT, WARN) \
  77        /* infos (reported as warnings, but ignored by default) */ \
  78        FUNC(BAD_TAG_NAME, INFO) \
  79        FUNC(MISSING_TAGGER_ENTRY, INFO)
  80
  81#define MSG_ID(id, msg_type) FSCK_MSG_##id,
  82enum fsck_msg_id {
  83        FOREACH_MSG_ID(MSG_ID)
  84        FSCK_MSG_MAX
  85};
  86#undef MSG_ID
  87
  88#define STR(x) #x
  89#define MSG_ID(id, msg_type) { STR(id), NULL, FSCK_##msg_type },
  90static struct {
  91        const char *id_string;
  92        const char *downcased;
  93        int msg_type;
  94} msg_id_info[FSCK_MSG_MAX + 1] = {
  95        FOREACH_MSG_ID(MSG_ID)
  96        { NULL, NULL, -1 }
  97};
  98#undef MSG_ID
  99
 100static int parse_msg_id(const char *text)
 101{
 102        int i;
 103
 104        if (!msg_id_info[0].downcased) {
 105                /* convert id_string to lower case, without underscores. */
 106                for (i = 0; i < FSCK_MSG_MAX; i++) {
 107                        const char *p = msg_id_info[i].id_string;
 108                        int len = strlen(p);
 109                        char *q = xmalloc(len);
 110
 111                        msg_id_info[i].downcased = q;
 112                        while (*p)
 113                                if (*p == '_')
 114                                        p++;
 115                                else
 116                                        *(q)++ = tolower(*(p)++);
 117                        *q = '\0';
 118                }
 119        }
 120
 121        for (i = 0; i < FSCK_MSG_MAX; i++)
 122                if (!strcmp(text, msg_id_info[i].downcased))
 123                        return i;
 124
 125        return -1;
 126}
 127
 128static int fsck_msg_type(enum fsck_msg_id msg_id,
 129        struct fsck_options *options)
 130{
 131        int msg_type;
 132
 133        assert(msg_id >= 0 && msg_id < FSCK_MSG_MAX);
 134
 135        if (options->msg_type)
 136                msg_type = options->msg_type[msg_id];
 137        else {
 138                msg_type = msg_id_info[msg_id].msg_type;
 139                if (options->strict && msg_type == FSCK_WARN)
 140                        msg_type = FSCK_ERROR;
 141        }
 142
 143        return msg_type;
 144}
 145
 146static void init_skiplist(struct fsck_options *options, const char *path)
 147{
 148        static struct oid_array skiplist = OID_ARRAY_INIT;
 149        int sorted, fd;
 150        char buffer[GIT_MAX_HEXSZ + 1];
 151        struct object_id oid;
 152
 153        if (options->skiplist)
 154                sorted = options->skiplist->sorted;
 155        else {
 156                sorted = 1;
 157                options->skiplist = &skiplist;
 158        }
 159
 160        fd = open(path, O_RDONLY);
 161        if (fd < 0)
 162                die("Could not open skip list: %s", path);
 163        for (;;) {
 164                const char *p;
 165                int result = read_in_full(fd, buffer, sizeof(buffer));
 166                if (result < 0)
 167                        die_errno("Could not read '%s'", path);
 168                if (!result)
 169                        break;
 170                if (parse_oid_hex(buffer, &oid, &p) || *p != '\n')
 171                        die("Invalid SHA-1: %s", buffer);
 172                oid_array_append(&skiplist, &oid);
 173                if (sorted && skiplist.nr > 1 &&
 174                                oidcmp(&skiplist.oid[skiplist.nr - 2],
 175                                       &oid) > 0)
 176                        sorted = 0;
 177        }
 178        close(fd);
 179
 180        if (sorted)
 181                skiplist.sorted = 1;
 182}
 183
 184static int parse_msg_type(const char *str)
 185{
 186        if (!strcmp(str, "error"))
 187                return FSCK_ERROR;
 188        else if (!strcmp(str, "warn"))
 189                return FSCK_WARN;
 190        else if (!strcmp(str, "ignore"))
 191                return FSCK_IGNORE;
 192        else
 193                die("Unknown fsck message type: '%s'", str);
 194}
 195
 196int is_valid_msg_type(const char *msg_id, const char *msg_type)
 197{
 198        if (parse_msg_id(msg_id) < 0)
 199                return 0;
 200        parse_msg_type(msg_type);
 201        return 1;
 202}
 203
 204void fsck_set_msg_type(struct fsck_options *options,
 205                const char *msg_id, const char *msg_type)
 206{
 207        int id = parse_msg_id(msg_id), type;
 208
 209        if (id < 0)
 210                die("Unhandled message id: %s", msg_id);
 211        type = parse_msg_type(msg_type);
 212
 213        if (type != FSCK_ERROR && msg_id_info[id].msg_type == FSCK_FATAL)
 214                die("Cannot demote %s to %s", msg_id, msg_type);
 215
 216        if (!options->msg_type) {
 217                int i;
 218                int *msg_type;
 219                ALLOC_ARRAY(msg_type, FSCK_MSG_MAX);
 220                for (i = 0; i < FSCK_MSG_MAX; i++)
 221                        msg_type[i] = fsck_msg_type(i, options);
 222                options->msg_type = msg_type;
 223        }
 224
 225        options->msg_type[id] = type;
 226}
 227
 228void fsck_set_msg_types(struct fsck_options *options, const char *values)
 229{
 230        char *buf = xstrdup(values), *to_free = buf;
 231        int done = 0;
 232
 233        while (!done) {
 234                int len = strcspn(buf, " ,|"), equal;
 235
 236                done = !buf[len];
 237                if (!len) {
 238                        buf++;
 239                        continue;
 240                }
 241                buf[len] = '\0';
 242
 243                for (equal = 0;
 244                     equal < len && buf[equal] != '=' && buf[equal] != ':';
 245                     equal++)
 246                        buf[equal] = tolower(buf[equal]);
 247                buf[equal] = '\0';
 248
 249                if (!strcmp(buf, "skiplist")) {
 250                        if (equal == len)
 251                                die("skiplist requires a path");
 252                        init_skiplist(options, buf + equal + 1);
 253                        buf += len + 1;
 254                        continue;
 255                }
 256
 257                if (equal == len)
 258                        die("Missing '=': '%s'", buf);
 259
 260                fsck_set_msg_type(options, buf, buf + equal + 1);
 261                buf += len + 1;
 262        }
 263        free(to_free);
 264}
 265
 266static void append_msg_id(struct strbuf *sb, const char *msg_id)
 267{
 268        for (;;) {
 269                char c = *(msg_id)++;
 270
 271                if (!c)
 272                        break;
 273                if (c != '_')
 274                        strbuf_addch(sb, tolower(c));
 275                else {
 276                        assert(*msg_id);
 277                        strbuf_addch(sb, *(msg_id)++);
 278                }
 279        }
 280
 281        strbuf_addstr(sb, ": ");
 282}
 283
 284__attribute__((format (printf, 4, 5)))
 285static int report(struct fsck_options *options, struct object *object,
 286        enum fsck_msg_id id, const char *fmt, ...)
 287{
 288        va_list ap;
 289        struct strbuf sb = STRBUF_INIT;
 290        int msg_type = fsck_msg_type(id, options), result;
 291
 292        if (msg_type == FSCK_IGNORE)
 293                return 0;
 294
 295        if (options->skiplist && object &&
 296                        oid_array_lookup(options->skiplist, &object->oid) >= 0)
 297                return 0;
 298
 299        if (msg_type == FSCK_FATAL)
 300                msg_type = FSCK_ERROR;
 301        else if (msg_type == FSCK_INFO)
 302                msg_type = FSCK_WARN;
 303
 304        append_msg_id(&sb, msg_id_info[id].id_string);
 305
 306        va_start(ap, fmt);
 307        strbuf_vaddf(&sb, fmt, ap);
 308        result = options->error_func(options, object, msg_type, sb.buf);
 309        strbuf_release(&sb);
 310        va_end(ap);
 311
 312        return result;
 313}
 314
 315static char *get_object_name(struct fsck_options *options, struct object *obj)
 316{
 317        if (!options->object_names)
 318                return NULL;
 319        return lookup_decoration(options->object_names, obj);
 320}
 321
 322static void put_object_name(struct fsck_options *options, struct object *obj,
 323        const char *fmt, ...)
 324{
 325        va_list ap;
 326        struct strbuf buf = STRBUF_INIT;
 327        char *existing;
 328
 329        if (!options->object_names)
 330                return;
 331        existing = lookup_decoration(options->object_names, obj);
 332        if (existing)
 333                return;
 334        va_start(ap, fmt);
 335        strbuf_vaddf(&buf, fmt, ap);
 336        add_decoration(options->object_names, obj, strbuf_detach(&buf, NULL));
 337        va_end(ap);
 338}
 339
 340static const char *describe_object(struct fsck_options *o, struct object *obj)
 341{
 342        static struct strbuf buf = STRBUF_INIT;
 343        char *name;
 344
 345        strbuf_reset(&buf);
 346        strbuf_addstr(&buf, oid_to_hex(&obj->oid));
 347        if (o->object_names && (name = lookup_decoration(o->object_names, obj)))
 348                strbuf_addf(&buf, " (%s)", name);
 349
 350        return buf.buf;
 351}
 352
 353static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
 354{
 355        struct tree_desc desc;
 356        struct name_entry entry;
 357        int res = 0;
 358        const char *name;
 359
 360        if (parse_tree(tree))
 361                return -1;
 362
 363        name = get_object_name(options, &tree->object);
 364        if (init_tree_desc_gently(&desc, tree->buffer, tree->size))
 365                return -1;
 366        while (tree_entry_gently(&desc, &entry)) {
 367                struct object *obj;
 368                int result;
 369
 370                if (S_ISGITLINK(entry.mode))
 371                        continue;
 372
 373                if (S_ISDIR(entry.mode)) {
 374                        obj = (struct object *)lookup_tree(entry.oid);
 375                        if (name && obj)
 376                                put_object_name(options, obj, "%s%s/", name,
 377                                        entry.path);
 378                        result = options->walk(obj, OBJ_TREE, data, options);
 379                }
 380                else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
 381                        obj = (struct object *)lookup_blob(entry.oid);
 382                        if (name && obj)
 383                                put_object_name(options, obj, "%s%s", name,
 384                                        entry.path);
 385                        result = options->walk(obj, OBJ_BLOB, data, options);
 386                }
 387                else {
 388                        result = error("in tree %s: entry %s has bad mode %.6o",
 389                                        describe_object(options, &tree->object), entry.path, entry.mode);
 390                }
 391                if (result < 0)
 392                        return result;
 393                if (!res)
 394                        res = result;
 395        }
 396        return res;
 397}
 398
 399static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
 400{
 401        int counter = 0, generation = 0, name_prefix_len = 0;
 402        struct commit_list *parents;
 403        int res;
 404        int result;
 405        const char *name;
 406
 407        if (parse_commit(commit))
 408                return -1;
 409
 410        name = get_object_name(options, &commit->object);
 411        if (name)
 412                put_object_name(options, &get_commit_tree(commit)->object,
 413                                "%s:", name);
 414
 415        result = options->walk((struct object *)get_commit_tree(commit),
 416                               OBJ_TREE, data, options);
 417        if (result < 0)
 418                return result;
 419        res = result;
 420
 421        parents = commit->parents;
 422        if (name && parents) {
 423                int len = strlen(name), power;
 424
 425                if (len && name[len - 1] == '^') {
 426                        generation = 1;
 427                        name_prefix_len = len - 1;
 428                }
 429                else { /* parse ~<generation> suffix */
 430                        for (generation = 0, power = 1;
 431                             len && isdigit(name[len - 1]);
 432                             power *= 10)
 433                                generation += power * (name[--len] - '0');
 434                        if (power > 1 && len && name[len - 1] == '~')
 435                                name_prefix_len = len - 1;
 436                }
 437        }
 438
 439        while (parents) {
 440                if (name) {
 441                        struct object *obj = &parents->item->object;
 442
 443                        if (++counter > 1)
 444                                put_object_name(options, obj, "%s^%d",
 445                                        name, counter);
 446                        else if (generation > 0)
 447                                put_object_name(options, obj, "%.*s~%d",
 448                                        name_prefix_len, name, generation + 1);
 449                        else
 450                                put_object_name(options, obj, "%s^", name);
 451                }
 452                result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
 453                if (result < 0)
 454                        return result;
 455                if (!res)
 456                        res = result;
 457                parents = parents->next;
 458        }
 459        return res;
 460}
 461
 462static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
 463{
 464        char *name = get_object_name(options, &tag->object);
 465
 466        if (parse_tag(tag))
 467                return -1;
 468        if (name)
 469                put_object_name(options, tag->tagged, "%s", name);
 470        return options->walk(tag->tagged, OBJ_ANY, data, options);
 471}
 472
 473int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
 474{
 475        if (!obj)
 476                return -1;
 477
 478        if (obj->type == OBJ_NONE)
 479                parse_object(&obj->oid);
 480
 481        switch (obj->type) {
 482        case OBJ_BLOB:
 483                return 0;
 484        case OBJ_TREE:
 485                return fsck_walk_tree((struct tree *)obj, data, options);
 486        case OBJ_COMMIT:
 487                return fsck_walk_commit((struct commit *)obj, data, options);
 488        case OBJ_TAG:
 489                return fsck_walk_tag((struct tag *)obj, data, options);
 490        default:
 491                error("Unknown object type for %s", describe_object(options, obj));
 492                return -1;
 493        }
 494}
 495
 496/*
 497 * The entries in a tree are ordered in the _path_ order,
 498 * which means that a directory entry is ordered by adding
 499 * a slash to the end of it.
 500 *
 501 * So a directory called "a" is ordered _after_ a file
 502 * called "a.c", because "a/" sorts after "a.c".
 503 */
 504#define TREE_UNORDERED (-1)
 505#define TREE_HAS_DUPS  (-2)
 506
 507static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
 508{
 509        int len1 = strlen(name1);
 510        int len2 = strlen(name2);
 511        int len = len1 < len2 ? len1 : len2;
 512        unsigned char c1, c2;
 513        int cmp;
 514
 515        cmp = memcmp(name1, name2, len);
 516        if (cmp < 0)
 517                return 0;
 518        if (cmp > 0)
 519                return TREE_UNORDERED;
 520
 521        /*
 522         * Ok, the first <len> characters are the same.
 523         * Now we need to order the next one, but turn
 524         * a '\0' into a '/' for a directory entry.
 525         */
 526        c1 = name1[len];
 527        c2 = name2[len];
 528        if (!c1 && !c2)
 529                /*
 530                 * git-write-tree used to write out a nonsense tree that has
 531                 * entries with the same name, one blob and one tree.  Make
 532                 * sure we do not have duplicate entries.
 533                 */
 534                return TREE_HAS_DUPS;
 535        if (!c1 && S_ISDIR(mode1))
 536                c1 = '/';
 537        if (!c2 && S_ISDIR(mode2))
 538                c2 = '/';
 539        return c1 < c2 ? 0 : TREE_UNORDERED;
 540}
 541
 542static int fsck_tree(struct tree *item, struct fsck_options *options)
 543{
 544        int retval = 0;
 545        int has_null_sha1 = 0;
 546        int has_full_path = 0;
 547        int has_empty_name = 0;
 548        int has_dot = 0;
 549        int has_dotdot = 0;
 550        int has_dotgit = 0;
 551        int has_zero_pad = 0;
 552        int has_bad_modes = 0;
 553        int has_dup_entries = 0;
 554        int not_properly_sorted = 0;
 555        struct tree_desc desc;
 556        unsigned o_mode;
 557        const char *o_name;
 558
 559        if (init_tree_desc_gently(&desc, item->buffer, item->size)) {
 560                retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 561                return retval;
 562        }
 563
 564        o_mode = 0;
 565        o_name = NULL;
 566
 567        while (desc.size) {
 568                unsigned mode;
 569                const char *name;
 570                const struct object_id *oid;
 571
 572                oid = tree_entry_extract(&desc, &name, &mode);
 573
 574                has_null_sha1 |= is_null_oid(oid);
 575                has_full_path |= !!strchr(name, '/');
 576                has_empty_name |= !*name;
 577                has_dot |= !strcmp(name, ".");
 578                has_dotdot |= !strcmp(name, "..");
 579                has_dotgit |= is_hfs_dotgit(name) || is_ntfs_dotgit(name);
 580                has_zero_pad |= *(char *)desc.buffer == '0';
 581
 582                if (is_hfs_dotgitmodules(name) || is_ntfs_dotgitmodules(name)) {
 583                        if (!S_ISLNK(mode))
 584                                oidset_insert(&gitmodules_found, oid);
 585                        else
 586                                retval += report(options, &item->object,
 587                                                 FSCK_MSG_GITMODULES_SYMLINK,
 588                                                 ".gitmodules is a symbolic link");
 589                }
 590
 591                if (update_tree_entry_gently(&desc)) {
 592                        retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
 593                        break;
 594                }
 595
 596                switch (mode) {
 597                /*
 598                 * Standard modes..
 599                 */
 600                case S_IFREG | 0755:
 601                case S_IFREG | 0644:
 602                case S_IFLNK:
 603                case S_IFDIR:
 604                case S_IFGITLINK:
 605                        break;
 606                /*
 607                 * This is nonstandard, but we had a few of these
 608                 * early on when we honored the full set of mode
 609                 * bits..
 610                 */
 611                case S_IFREG | 0664:
 612                        if (!options->strict)
 613                                break;
 614                        /* fallthrough */
 615                default:
 616                        has_bad_modes = 1;
 617                }
 618
 619                if (o_name) {
 620                        switch (verify_ordered(o_mode, o_name, mode, name)) {
 621                        case TREE_UNORDERED:
 622                                not_properly_sorted = 1;
 623                                break;
 624                        case TREE_HAS_DUPS:
 625                                has_dup_entries = 1;
 626                                break;
 627                        default:
 628                                break;
 629                        }
 630                }
 631
 632                o_mode = mode;
 633                o_name = name;
 634        }
 635
 636        if (has_null_sha1)
 637                retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
 638        if (has_full_path)
 639                retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
 640        if (has_empty_name)
 641                retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
 642        if (has_dot)
 643                retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
 644        if (has_dotdot)
 645                retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
 646        if (has_dotgit)
 647                retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
 648        if (has_zero_pad)
 649                retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
 650        if (has_bad_modes)
 651                retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
 652        if (has_dup_entries)
 653                retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
 654        if (not_properly_sorted)
 655                retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
 656        return retval;
 657}
 658
 659static int verify_headers(const void *data, unsigned long size,
 660                          struct object *obj, struct fsck_options *options)
 661{
 662        const char *buffer = (const char *)data;
 663        unsigned long i;
 664
 665        for (i = 0; i < size; i++) {
 666                switch (buffer[i]) {
 667                case '\0':
 668                        return report(options, obj,
 669                                FSCK_MSG_NUL_IN_HEADER,
 670                                "unterminated header: NUL at offset %ld", i);
 671                case '\n':
 672                        if (i + 1 < size && buffer[i + 1] == '\n')
 673                                return 0;
 674                }
 675        }
 676
 677        /*
 678         * We did not find double-LF that separates the header
 679         * and the body.  Not having a body is not a crime but
 680         * we do want to see the terminating LF for the last header
 681         * line.
 682         */
 683        if (size && buffer[size - 1] == '\n')
 684                return 0;
 685
 686        return report(options, obj,
 687                FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
 688}
 689
 690static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
 691{
 692        const char *p = *ident;
 693        char *end;
 694
 695        *ident = strchrnul(*ident, '\n');
 696        if (**ident == '\n')
 697                (*ident)++;
 698
 699        if (*p == '<')
 700                return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 701        p += strcspn(p, "<>\n");
 702        if (*p == '>')
 703                return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
 704        if (*p != '<')
 705                return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
 706        if (p[-1] != ' ')
 707                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
 708        p++;
 709        p += strcspn(p, "<>\n");
 710        if (*p != '>')
 711                return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
 712        p++;
 713        if (*p != ' ')
 714                return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
 715        p++;
 716        if (*p == '0' && p[1] != ' ')
 717                return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
 718        if (date_overflows(parse_timestamp(p, &end, 10)))
 719                return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
 720        if ((end == p || *end != ' '))
 721                return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
 722        p = end + 1;
 723        if ((*p != '+' && *p != '-') ||
 724            !isdigit(p[1]) ||
 725            !isdigit(p[2]) ||
 726            !isdigit(p[3]) ||
 727            !isdigit(p[4]) ||
 728            (p[5] != '\n'))
 729                return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
 730        p += 6;
 731        return 0;
 732}
 733
 734static int fsck_commit_buffer(struct commit *commit, const char *buffer,
 735        unsigned long size, struct fsck_options *options)
 736{
 737        struct object_id tree_oid, oid;
 738        struct commit_graft *graft;
 739        unsigned parent_count, parent_line_count = 0, author_count;
 740        int err;
 741        const char *buffer_begin = buffer;
 742        const char *p;
 743
 744        if (verify_headers(buffer, size, &commit->object, options))
 745                return -1;
 746
 747        if (!skip_prefix(buffer, "tree ", &buffer))
 748                return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
 749        if (parse_oid_hex(buffer, &tree_oid, &p) || *p != '\n') {
 750                err = report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
 751                if (err)
 752                        return err;
 753        }
 754        buffer = p + 1;
 755        while (skip_prefix(buffer, "parent ", &buffer)) {
 756                if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
 757                        err = report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
 758                        if (err)
 759                                return err;
 760                }
 761                buffer = p + 1;
 762                parent_line_count++;
 763        }
 764        graft = lookup_commit_graft(&commit->object.oid);
 765        parent_count = commit_list_count(commit->parents);
 766        if (graft) {
 767                if (graft->nr_parent == -1 && !parent_count)
 768                        ; /* shallow commit */
 769                else if (graft->nr_parent != parent_count) {
 770                        err = report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
 771                        if (err)
 772                                return err;
 773                }
 774        } else {
 775                if (parent_count != parent_line_count) {
 776                        err = report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
 777                        if (err)
 778                                return err;
 779                }
 780        }
 781        author_count = 0;
 782        while (skip_prefix(buffer, "author ", &buffer)) {
 783                author_count++;
 784                err = fsck_ident(&buffer, &commit->object, options);
 785                if (err)
 786                        return err;
 787        }
 788        if (author_count < 1)
 789                err = report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
 790        else if (author_count > 1)
 791                err = report(options, &commit->object, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
 792        if (err)
 793                return err;
 794        if (!skip_prefix(buffer, "committer ", &buffer))
 795                return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
 796        err = fsck_ident(&buffer, &commit->object, options);
 797        if (err)
 798                return err;
 799        if (!get_commit_tree(commit)) {
 800                err = report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", oid_to_hex(&tree_oid));
 801                if (err)
 802                        return err;
 803        }
 804        if (memchr(buffer_begin, '\0', size)) {
 805                err = report(options, &commit->object, FSCK_MSG_NUL_IN_COMMIT,
 806                             "NUL byte in the commit object body");
 807                if (err)
 808                        return err;
 809        }
 810        return 0;
 811}
 812
 813static int fsck_commit(struct commit *commit, const char *data,
 814        unsigned long size, struct fsck_options *options)
 815{
 816        const char *buffer = data ?  data : get_commit_buffer(commit, &size);
 817        int ret = fsck_commit_buffer(commit, buffer, size, options);
 818        if (!data)
 819                unuse_commit_buffer(commit, buffer);
 820        return ret;
 821}
 822
 823static int fsck_tag_buffer(struct tag *tag, const char *data,
 824        unsigned long size, struct fsck_options *options)
 825{
 826        struct object_id oid;
 827        int ret = 0;
 828        const char *buffer;
 829        char *to_free = NULL, *eol;
 830        struct strbuf sb = STRBUF_INIT;
 831        const char *p;
 832
 833        if (data)
 834                buffer = data;
 835        else {
 836                enum object_type type;
 837
 838                buffer = to_free =
 839                        read_object_file(&tag->object.oid, &type, &size);
 840                if (!buffer)
 841                        return report(options, &tag->object,
 842                                FSCK_MSG_MISSING_TAG_OBJECT,
 843                                "cannot read tag object");
 844
 845                if (type != OBJ_TAG) {
 846                        ret = report(options, &tag->object,
 847                                FSCK_MSG_TAG_OBJECT_NOT_TAG,
 848                                "expected tag got %s",
 849                            type_name(type));
 850                        goto done;
 851                }
 852        }
 853
 854        ret = verify_headers(buffer, size, &tag->object, options);
 855        if (ret)
 856                goto done;
 857
 858        if (!skip_prefix(buffer, "object ", &buffer)) {
 859                ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
 860                goto done;
 861        }
 862        if (parse_oid_hex(buffer, &oid, &p) || *p != '\n') {
 863                ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
 864                if (ret)
 865                        goto done;
 866        }
 867        buffer = p + 1;
 868
 869        if (!skip_prefix(buffer, "type ", &buffer)) {
 870                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
 871                goto done;
 872        }
 873        eol = strchr(buffer, '\n');
 874        if (!eol) {
 875                ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
 876                goto done;
 877        }
 878        if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
 879                ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
 880        if (ret)
 881                goto done;
 882        buffer = eol + 1;
 883
 884        if (!skip_prefix(buffer, "tag ", &buffer)) {
 885                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
 886                goto done;
 887        }
 888        eol = strchr(buffer, '\n');
 889        if (!eol) {
 890                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
 891                goto done;
 892        }
 893        strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
 894        if (check_refname_format(sb.buf, 0)) {
 895                ret = report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
 896                           "invalid 'tag' name: %.*s",
 897                           (int)(eol - buffer), buffer);
 898                if (ret)
 899                        goto done;
 900        }
 901        buffer = eol + 1;
 902
 903        if (!skip_prefix(buffer, "tagger ", &buffer)) {
 904                /* early tags do not contain 'tagger' lines; warn only */
 905                ret = report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
 906                if (ret)
 907                        goto done;
 908        }
 909        else
 910                ret = fsck_ident(&buffer, &tag->object, options);
 911
 912done:
 913        strbuf_release(&sb);
 914        free(to_free);
 915        return ret;
 916}
 917
 918static int fsck_tag(struct tag *tag, const char *data,
 919        unsigned long size, struct fsck_options *options)
 920{
 921        struct object *tagged = tag->tagged;
 922
 923        if (!tagged)
 924                return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
 925
 926        return fsck_tag_buffer(tag, data, size, options);
 927}
 928
 929struct fsck_gitmodules_data {
 930        struct object *obj;
 931        struct fsck_options *options;
 932        int ret;
 933};
 934
 935static int fsck_gitmodules_fn(const char *var, const char *value, void *vdata)
 936{
 937        struct fsck_gitmodules_data *data = vdata;
 938        const char *subsection, *key;
 939        int subsection_len;
 940        char *name;
 941
 942        if (parse_config_key(var, "submodule", &subsection, &subsection_len, &key) < 0 ||
 943            !subsection)
 944                return 0;
 945
 946        name = xmemdupz(subsection, subsection_len);
 947        if (check_submodule_name(name) < 0)
 948                data->ret |= report(data->options, data->obj,
 949                                    FSCK_MSG_GITMODULES_NAME,
 950                                    "disallowed submodule name: %s",
 951                                    name);
 952        free(name);
 953
 954        return 0;
 955}
 956
 957static int fsck_blob(struct blob *blob, const char *buf,
 958                     unsigned long size, struct fsck_options *options)
 959{
 960        struct fsck_gitmodules_data data;
 961
 962        if (!oidset_contains(&gitmodules_found, &blob->object.oid))
 963                return 0;
 964        oidset_insert(&gitmodules_done, &blob->object.oid);
 965
 966        if (!buf) {
 967                /*
 968                 * A missing buffer here is a sign that the caller found the
 969                 * blob too gigantic to load into memory. Let's just consider
 970                 * that an error.
 971                 */
 972                return report(options, &blob->object,
 973                              FSCK_MSG_GITMODULES_PARSE,
 974                              ".gitmodules too large to parse");
 975        }
 976
 977        data.obj = &blob->object;
 978        data.options = options;
 979        data.ret = 0;
 980        if (git_config_from_mem(fsck_gitmodules_fn, CONFIG_ORIGIN_BLOB,
 981                                ".gitmodules", buf, size, &data))
 982                data.ret |= report(options, &blob->object,
 983                                   FSCK_MSG_GITMODULES_PARSE,
 984                                   "could not parse gitmodules blob");
 985
 986        return data.ret;
 987}
 988
 989int fsck_object(struct object *obj, void *data, unsigned long size,
 990        struct fsck_options *options)
 991{
 992        if (!obj)
 993                return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
 994
 995        if (obj->type == OBJ_BLOB)
 996                return fsck_blob((struct blob *)obj, data, size, options);
 997        if (obj->type == OBJ_TREE)
 998                return fsck_tree((struct tree *) obj, options);
 999        if (obj->type == OBJ_COMMIT)
1000                return fsck_commit((struct commit *) obj, (const char *) data,
1001                        size, options);
1002        if (obj->type == OBJ_TAG)
1003                return fsck_tag((struct tag *) obj, (const char *) data,
1004                        size, options);
1005
1006        return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
1007                          obj->type);
1008}
1009
1010int fsck_error_function(struct fsck_options *o,
1011        struct object *obj, int msg_type, const char *message)
1012{
1013        if (msg_type == FSCK_WARN) {
1014                warning("object %s: %s", describe_object(o, obj), message);
1015                return 0;
1016        }
1017        error("object %s: %s", describe_object(o, obj), message);
1018        return 1;
1019}
1020
1021int fsck_finish(struct fsck_options *options)
1022{
1023        int ret = 0;
1024        struct oidset_iter iter;
1025        const struct object_id *oid;
1026
1027        oidset_iter_init(&gitmodules_found, &iter);
1028        while ((oid = oidset_iter_next(&iter))) {
1029                struct blob *blob;
1030                enum object_type type;
1031                unsigned long size;
1032                char *buf;
1033
1034                if (oidset_contains(&gitmodules_done, oid))
1035                        continue;
1036
1037                blob = lookup_blob(oid);
1038                if (!blob) {
1039                        ret |= report(options, &blob->object,
1040                                      FSCK_MSG_GITMODULES_BLOB,
1041                                      "non-blob found at .gitmodules");
1042                        continue;
1043                }
1044
1045                buf = read_object_file(oid, &type, &size);
1046                if (!buf) {
1047                        if (is_promisor_object(&blob->object.oid))
1048                                continue;
1049                        ret |= report(options, &blob->object,
1050                                      FSCK_MSG_GITMODULES_MISSING,
1051                                      "unable to read .gitmodules blob");
1052                        continue;
1053                }
1054
1055                if (type == OBJ_BLOB)
1056                        ret |= fsck_blob(blob, buf, size, options);
1057                else
1058                        ret |= report(options, &blob->object,
1059                                      FSCK_MSG_GITMODULES_BLOB,
1060                                      "non-blob found at .gitmodules");
1061                free(buf);
1062        }
1063
1064
1065        oidset_clear(&gitmodules_found);
1066        oidset_clear(&gitmodules_done);
1067        return ret;
1068}