fsck-objects.con commit Merge branch 'master' into js/merge-base (f23c75a)
   1#include <sys/types.h>
   2#include <dirent.h>
   3
   4#include "cache.h"
   5#include "commit.h"
   6#include "tree.h"
   7#include "blob.h"
   8#include "tag.h"
   9#include "refs.h"
  10#include "pack.h"
  11#include "cache-tree.h"
  12#include "tree-walk.h"
  13
  14#define REACHABLE 0x0001
  15#define SEEN      0x0002
  16
  17static int show_root = 0;
  18static int show_tags = 0;
  19static int show_unreachable = 0;
  20static int check_full = 0;
  21static int check_strict = 0;
  22static int keep_cache_objects = 0;
  23static unsigned char head_sha1[20];
  24
  25#ifdef NO_D_INO_IN_DIRENT
  26#define SORT_DIRENT 0
  27#define DIRENT_SORT_HINT(de) 0
  28#else
  29#define SORT_DIRENT 1
  30#define DIRENT_SORT_HINT(de) ((de)->d_ino)
  31#endif
  32
  33static void objreport(struct object *obj, const char *severity,
  34                      const char *err, va_list params)
  35{
  36        fprintf(stderr, "%s in %s %s: ",
  37                severity, typename(obj->type), sha1_to_hex(obj->sha1));
  38        vfprintf(stderr, err, params);
  39        fputs("\n", stderr);
  40}
  41
  42static int objerror(struct object *obj, const char *err, ...)
  43{
  44        va_list params;
  45        va_start(params, err);
  46        objreport(obj, "error", err, params);
  47        va_end(params);
  48        return -1;
  49}
  50
  51static int objwarning(struct object *obj, const char *err, ...)
  52{
  53        va_list params;
  54        va_start(params, err);
  55        objreport(obj, "warning", err, params);
  56        va_end(params);
  57        return -1;
  58}
  59
  60
  61static void check_connectivity(void)
  62{
  63        int i, max;
  64
  65        /* Look up all the requirements, warn about missing objects.. */
  66        max = get_max_object_index();
  67        for (i = 0; i < max; i++) {
  68                const struct object_refs *refs;
  69                struct object *obj = get_indexed_object(i);
  70
  71                if (!obj)
  72                        continue;
  73
  74                if (!obj->parsed) {
  75                        if (has_sha1_file(obj->sha1))
  76                                ; /* it is in pack */
  77                        else
  78                                printf("missing %s %s\n",
  79                                       typename(obj->type), sha1_to_hex(obj->sha1));
  80                        continue;
  81                }
  82
  83                refs = lookup_object_refs(obj);
  84                if (refs) {
  85                        unsigned j;
  86                        for (j = 0; j < refs->count; j++) {
  87                                struct object *ref = refs->ref[j];
  88                                if (ref->parsed ||
  89                                    (has_sha1_file(ref->sha1)))
  90                                        continue;
  91                                printf("broken link from %7s %s\n",
  92                                       typename(obj->type), sha1_to_hex(obj->sha1));
  93                                printf("              to %7s %s\n",
  94                                       typename(ref->type), sha1_to_hex(ref->sha1));
  95                        }
  96                }
  97
  98                if (show_unreachable && !(obj->flags & REACHABLE)) {
  99                        printf("unreachable %s %s\n",
 100                               typename(obj->type), sha1_to_hex(obj->sha1));
 101                        continue;
 102                }
 103
 104                if (!obj->used) {
 105                        printf("dangling %s %s\n", typename(obj->type),
 106                               sha1_to_hex(obj->sha1));
 107                }
 108        }
 109}
 110
 111/*
 112 * The entries in a tree are ordered in the _path_ order,
 113 * which means that a directory entry is ordered by adding
 114 * a slash to the end of it.
 115 *
 116 * So a directory called "a" is ordered _after_ a file
 117 * called "a.c", because "a/" sorts after "a.c".
 118 */
 119#define TREE_UNORDERED (-1)
 120#define TREE_HAS_DUPS  (-2)
 121
 122static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
 123{
 124        int len1 = strlen(name1);
 125        int len2 = strlen(name2);
 126        int len = len1 < len2 ? len1 : len2;
 127        unsigned char c1, c2;
 128        int cmp;
 129
 130        cmp = memcmp(name1, name2, len);
 131        if (cmp < 0)
 132                return 0;
 133        if (cmp > 0)
 134                return TREE_UNORDERED;
 135
 136        /*
 137         * Ok, the first <len> characters are the same.
 138         * Now we need to order the next one, but turn
 139         * a '\0' into a '/' for a directory entry.
 140         */
 141        c1 = name1[len];
 142        c2 = name2[len];
 143        if (!c1 && !c2)
 144                /*
 145                 * git-write-tree used to write out a nonsense tree that has
 146                 * entries with the same name, one blob and one tree.  Make
 147                 * sure we do not have duplicate entries.
 148                 */
 149                return TREE_HAS_DUPS;
 150        if (!c1 && S_ISDIR(mode1))
 151                c1 = '/';
 152        if (!c2 && S_ISDIR(mode2))
 153                c2 = '/';
 154        return c1 < c2 ? 0 : TREE_UNORDERED;
 155}
 156
 157static int fsck_tree(struct tree *item)
 158{
 159        int retval;
 160        int has_full_path = 0;
 161        int has_zero_pad = 0;
 162        int has_bad_modes = 0;
 163        int has_dup_entries = 0;
 164        int not_properly_sorted = 0;
 165        struct tree_desc desc;
 166        unsigned o_mode;
 167        const char *o_name;
 168        const unsigned char *o_sha1;
 169
 170        desc.buf = item->buffer;
 171        desc.size = item->size;
 172
 173        o_mode = 0;
 174        o_name = NULL;
 175        o_sha1 = NULL;
 176        while (desc.size) {
 177                unsigned mode;
 178                const char *name;
 179                const unsigned char *sha1;
 180
 181                sha1 = tree_entry_extract(&desc, &name, &mode);
 182
 183                if (strchr(name, '/'))
 184                        has_full_path = 1;
 185                has_zero_pad |= *(char *)desc.buf == '0';
 186                update_tree_entry(&desc);
 187
 188                switch (mode) {
 189                /*
 190                 * Standard modes..
 191                 */
 192                case S_IFREG | 0755:
 193                case S_IFREG | 0644:
 194                case S_IFLNK:
 195                case S_IFDIR:
 196                        break;
 197                /*
 198                 * This is nonstandard, but we had a few of these
 199                 * early on when we honored the full set of mode
 200                 * bits..
 201                 */
 202                case S_IFREG | 0664:
 203                        if (!check_strict)
 204                                break;
 205                default:
 206                        has_bad_modes = 1;
 207                }
 208
 209                if (o_name) {
 210                        switch (verify_ordered(o_mode, o_name, mode, name)) {
 211                        case TREE_UNORDERED:
 212                                not_properly_sorted = 1;
 213                                break;
 214                        case TREE_HAS_DUPS:
 215                                has_dup_entries = 1;
 216                                break;
 217                        default:
 218                                break;
 219                        }
 220                }
 221
 222                o_mode = mode;
 223                o_name = name;
 224                o_sha1 = sha1;
 225        }
 226        free(item->buffer);
 227        item->buffer = NULL;
 228
 229        retval = 0;
 230        if (has_full_path) {
 231                objwarning(&item->object, "contains full pathnames");
 232        }
 233        if (has_zero_pad) {
 234                objwarning(&item->object, "contains zero-padded file modes");
 235        }
 236        if (has_bad_modes) {
 237                objwarning(&item->object, "contains bad file modes");
 238        }
 239        if (has_dup_entries) {
 240                retval = objerror(&item->object, "contains duplicate file entries");
 241        }
 242        if (not_properly_sorted) {
 243                retval = objerror(&item->object, "not properly sorted");
 244        }
 245        return retval;
 246}
 247
 248static int fsck_commit(struct commit *commit)
 249{
 250        char *buffer = commit->buffer;
 251        unsigned char tree_sha1[20], sha1[20];
 252
 253        if (memcmp(buffer, "tree ", 5))
 254                return objerror(&commit->object, "invalid format - expected 'tree' line");
 255        if (get_sha1_hex(buffer+5, tree_sha1) || buffer[45] != '\n')
 256                return objerror(&commit->object, "invalid 'tree' line format - bad sha1");
 257        buffer += 46;
 258        while (!memcmp(buffer, "parent ", 7)) {
 259                if (get_sha1_hex(buffer+7, sha1) || buffer[47] != '\n')
 260                        return objerror(&commit->object, "invalid 'parent' line format - bad sha1");
 261                buffer += 48;
 262        }
 263        if (memcmp(buffer, "author ", 7))
 264                return objerror(&commit->object, "invalid format - expected 'author' line");
 265        free(commit->buffer);
 266        commit->buffer = NULL;
 267        if (!commit->tree)
 268                return objerror(&commit->object, "could not load commit's tree %s", tree_sha1);
 269        if (!commit->parents && show_root)
 270                printf("root %s\n", sha1_to_hex(commit->object.sha1));
 271        if (!commit->date)
 272                printf("bad commit date in %s\n", 
 273                       sha1_to_hex(commit->object.sha1));
 274        return 0;
 275}
 276
 277static int fsck_tag(struct tag *tag)
 278{
 279        struct object *tagged = tag->tagged;
 280
 281        if (!tagged) {
 282                return objerror(&tag->object, "could not load tagged object");
 283        }
 284        if (!show_tags)
 285                return 0;
 286
 287        printf("tagged %s %s", typename(tagged->type), sha1_to_hex(tagged->sha1));
 288        printf(" (%s) in %s\n", tag->tag, sha1_to_hex(tag->object.sha1));
 289        return 0;
 290}
 291
 292static int fsck_sha1(unsigned char *sha1)
 293{
 294        struct object *obj = parse_object(sha1);
 295        if (!obj)
 296                return error("%s: object not found", sha1_to_hex(sha1));
 297        if (obj->flags & SEEN)
 298                return 0;
 299        obj->flags |= SEEN;
 300        if (obj->type == TYPE_BLOB)
 301                return 0;
 302        if (obj->type == TYPE_TREE)
 303                return fsck_tree((struct tree *) obj);
 304        if (obj->type == TYPE_COMMIT)
 305                return fsck_commit((struct commit *) obj);
 306        if (obj->type == TYPE_TAG)
 307                return fsck_tag((struct tag *) obj);
 308        /* By now, parse_object() would've returned NULL instead. */
 309        return objerror(obj, "unknown type '%d' (internal fsck error)", obj->type);
 310}
 311
 312/*
 313 * This is the sorting chunk size: make it reasonably
 314 * big so that we can sort well..
 315 */
 316#define MAX_SHA1_ENTRIES (1024)
 317
 318struct sha1_entry {
 319        unsigned long ino;
 320        unsigned char sha1[20];
 321};
 322
 323static struct {
 324        unsigned long nr;
 325        struct sha1_entry *entry[MAX_SHA1_ENTRIES];
 326} sha1_list;
 327
 328static int ino_compare(const void *_a, const void *_b)
 329{
 330        const struct sha1_entry *a = _a, *b = _b;
 331        unsigned long ino1 = a->ino, ino2 = b->ino;
 332        return ino1 < ino2 ? -1 : ino1 > ino2 ? 1 : 0;
 333}
 334
 335static void fsck_sha1_list(void)
 336{
 337        int i, nr = sha1_list.nr;
 338
 339        if (SORT_DIRENT)
 340                qsort(sha1_list.entry, nr,
 341                      sizeof(struct sha1_entry *), ino_compare);
 342        for (i = 0; i < nr; i++) {
 343                struct sha1_entry *entry = sha1_list.entry[i];
 344                unsigned char *sha1 = entry->sha1;
 345
 346                sha1_list.entry[i] = NULL;
 347                fsck_sha1(sha1);
 348                free(entry);
 349        }
 350        sha1_list.nr = 0;
 351}
 352
 353static void add_sha1_list(unsigned char *sha1, unsigned long ino)
 354{
 355        struct sha1_entry *entry = xmalloc(sizeof(*entry));
 356        int nr;
 357
 358        entry->ino = ino;
 359        memcpy(entry->sha1, sha1, 20);
 360        nr = sha1_list.nr;
 361        if (nr == MAX_SHA1_ENTRIES) {
 362                fsck_sha1_list();
 363                nr = 0;
 364        }
 365        sha1_list.entry[nr] = entry;
 366        sha1_list.nr = ++nr;
 367}
 368
 369static int fsck_dir(int i, char *path)
 370{
 371        DIR *dir = opendir(path);
 372        struct dirent *de;
 373
 374        if (!dir)
 375                return 0;
 376
 377        while ((de = readdir(dir)) != NULL) {
 378                char name[100];
 379                unsigned char sha1[20];
 380                int len = strlen(de->d_name);
 381
 382                switch (len) {
 383                case 2:
 384                        if (de->d_name[1] != '.')
 385                                break;
 386                case 1:
 387                        if (de->d_name[0] != '.')
 388                                break;
 389                        continue;
 390                case 38:
 391                        sprintf(name, "%02x", i);
 392                        memcpy(name+2, de->d_name, len+1);
 393                        if (get_sha1_hex(name, sha1) < 0)
 394                                break;
 395                        add_sha1_list(sha1, DIRENT_SORT_HINT(de));
 396                        continue;
 397                }
 398                fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
 399        }
 400        closedir(dir);
 401        return 0;
 402}
 403
 404static int default_refs = 0;
 405
 406static int fsck_handle_ref(const char *refname, const unsigned char *sha1)
 407{
 408        struct object *obj;
 409
 410        obj = lookup_object(sha1);
 411        if (!obj) {
 412                if (has_sha1_file(sha1)) {
 413                        default_refs++;
 414                        return 0; /* it is in a pack */
 415                }
 416                error("%s: invalid sha1 pointer %s", refname, sha1_to_hex(sha1));
 417                /* We'll continue with the rest despite the error.. */
 418                return 0;
 419        }
 420        default_refs++;
 421        obj->used = 1;
 422        mark_reachable(obj, REACHABLE);
 423        return 0;
 424}
 425
 426static void get_default_heads(void)
 427{
 428        for_each_ref(fsck_handle_ref);
 429        if (!default_refs)
 430                die("No default references");
 431}
 432
 433static void fsck_object_dir(const char *path)
 434{
 435        int i;
 436        for (i = 0; i < 256; i++) {
 437                static char dir[4096];
 438                sprintf(dir, "%s/%02x", path, i);
 439                fsck_dir(i, dir);
 440        }
 441        fsck_sha1_list();
 442}
 443
 444static int fsck_head_link(void)
 445{
 446        unsigned char sha1[20];
 447        const char *git_HEAD = strdup(git_path("HEAD"));
 448        const char *git_refs_heads_master = resolve_ref(git_HEAD, sha1, 1);
 449        int pfxlen = strlen(git_HEAD) - 4; /* strip .../.git/ part */
 450
 451        if (!git_refs_heads_master)
 452                return error("HEAD is not a symbolic ref");
 453        if (strncmp(git_refs_heads_master + pfxlen, "refs/heads/", 11))
 454                return error("HEAD points to something strange (%s)",
 455                             git_refs_heads_master + pfxlen);
 456        if (!memcmp(null_sha1, sha1, 20))
 457                return error("HEAD: not a valid git pointer");
 458        return 0;
 459}
 460
 461static int fsck_cache_tree(struct cache_tree *it)
 462{
 463        int i;
 464        int err = 0;
 465
 466        if (0 <= it->entry_count) {
 467                struct object *obj = parse_object(it->sha1);
 468                if (!obj) {
 469                        error("%s: invalid sha1 pointer in cache-tree",
 470                              sha1_to_hex(it->sha1));
 471                        return 1;
 472                }
 473                mark_reachable(obj, REACHABLE);
 474                obj->used = 1;
 475                if (obj->type != TYPE_TREE)
 476                        err |= objerror(obj, "non-tree in cache-tree");
 477        }
 478        for (i = 0; i < it->subtree_nr; i++)
 479                err |= fsck_cache_tree(it->down[i]->cache_tree);
 480        return err;
 481}
 482
 483int main(int argc, char **argv)
 484{
 485        int i, heads;
 486
 487        track_object_refs = 1;
 488        setup_git_directory();
 489
 490        for (i = 1; i < argc; i++) {
 491                const char *arg = argv[i];
 492
 493                if (!strcmp(arg, "--unreachable")) {
 494                        show_unreachable = 1;
 495                        continue;
 496                }
 497                if (!strcmp(arg, "--tags")) {
 498                        show_tags = 1;
 499                        continue;
 500                }
 501                if (!strcmp(arg, "--root")) {
 502                        show_root = 1;
 503                        continue;
 504                }
 505                if (!strcmp(arg, "--cache")) {
 506                        keep_cache_objects = 1;
 507                        continue;
 508                }
 509                if (!strcmp(arg, "--full")) {
 510                        check_full = 1;
 511                        continue;
 512                }
 513                if (!strcmp(arg, "--strict")) {
 514                        check_strict = 1;
 515                        continue;
 516                }
 517                if (*arg == '-')
 518                        usage("git-fsck-objects [--tags] [--root] [[--unreachable] [--cache] [--full] [--strict] <head-sha1>*]");
 519        }
 520
 521        fsck_head_link();
 522        fsck_object_dir(get_object_directory());
 523        if (check_full) {
 524                struct alternate_object_database *alt;
 525                struct packed_git *p;
 526                prepare_alt_odb();
 527                for (alt = alt_odb_list; alt; alt = alt->next) {
 528                        char namebuf[PATH_MAX];
 529                        int namelen = alt->name - alt->base;
 530                        memcpy(namebuf, alt->base, namelen);
 531                        namebuf[namelen - 1] = 0;
 532                        fsck_object_dir(namebuf);
 533                }
 534                prepare_packed_git();
 535                for (p = packed_git; p; p = p->next)
 536                        /* verify gives error messages itself */
 537                        verify_pack(p, 0);
 538
 539                for (p = packed_git; p; p = p->next) {
 540                        int num = num_packed_objects(p);
 541                        for (i = 0; i < num; i++) {
 542                                unsigned char sha1[20];
 543                                nth_packed_object_sha1(p, i, sha1);
 544                                fsck_sha1(sha1);
 545                        }
 546                }
 547        }
 548
 549        heads = 0;
 550        for (i = 1; i < argc; i++) {
 551                const char *arg = argv[i]; 
 552
 553                if (*arg == '-')
 554                        continue;
 555
 556                if (!get_sha1(arg, head_sha1)) {
 557                        struct object *obj = lookup_object(head_sha1);
 558
 559                        /* Error is printed by lookup_object(). */
 560                        if (!obj)
 561                                continue;
 562
 563                        obj->used = 1;
 564                        mark_reachable(obj, REACHABLE);
 565                        heads++;
 566                        continue;
 567                }
 568                error("invalid parameter: expected sha1, got '%s'", arg);
 569        }
 570
 571        /*
 572         * If we've not been given any explicit head information, do the
 573         * default ones from .git/refs. We also consider the index file
 574         * in this case (ie this implies --cache).
 575         */
 576        if (!heads) {
 577                get_default_heads();
 578                keep_cache_objects = 1;
 579        }
 580
 581        if (keep_cache_objects) {
 582                int i;
 583                read_cache();
 584                for (i = 0; i < active_nr; i++) {
 585                        struct blob *blob = lookup_blob(active_cache[i]->sha1);
 586                        struct object *obj;
 587                        if (!blob)
 588                                continue;
 589                        obj = &blob->object;
 590                        obj->used = 1;
 591                        mark_reachable(obj, REACHABLE);
 592                }
 593                if (active_cache_tree)
 594                        fsck_cache_tree(active_cache_tree);
 595        }
 596
 597        check_connectivity();
 598        return 0;
 599}