fsck-objects.con commit Merge part of branch 'jc/upload-pack' (7f0f4fa)
   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;
  18static int show_tags;
  19static int show_unreachable;
  20static int check_full;
  21static int check_strict;
  22static int keep_cache_objects;
  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 == OBJ_BLOB)
 301                return 0;
 302        if (obj->type == OBJ_TREE)
 303                return fsck_tree((struct tree *) obj);
 304        if (obj->type == OBJ_COMMIT)
 305                return fsck_commit((struct commit *) obj);
 306        if (obj->type == OBJ_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        hashcpy(entry->sha1, sha1);
 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 void fsck_dir(int i, char *path)
 370{
 371        DIR *dir = opendir(path);
 372        struct dirent *de;
 373
 374        if (!dir)
 375                return;
 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}
 402
 403static int default_refs;
 404
 405static int fsck_handle_ref(const char *refname, const unsigned char *sha1)
 406{
 407        struct object *obj;
 408
 409        obj = lookup_object(sha1);
 410        if (!obj) {
 411                if (has_sha1_file(sha1)) {
 412                        default_refs++;
 413                        return 0; /* it is in a pack */
 414                }
 415                error("%s: invalid sha1 pointer %s", refname, sha1_to_hex(sha1));
 416                /* We'll continue with the rest despite the error.. */
 417                return 0;
 418        }
 419        default_refs++;
 420        obj->used = 1;
 421        mark_reachable(obj, REACHABLE);
 422        return 0;
 423}
 424
 425static void get_default_heads(void)
 426{
 427        for_each_ref(fsck_handle_ref);
 428
 429        /*
 430         * Not having any default heads isn't really fatal, but
 431         * it does mean that "--unreachable" no longer makes any
 432         * sense (since in this case everything will obviously
 433         * be unreachable by definition.
 434         *
 435         * Showing dangling objects is valid, though (as those
 436         * dangling objects are likely lost heads).
 437         *
 438         * So we just print a warning about it, and clear the
 439         * "show_unreachable" flag.
 440         */
 441        if (!default_refs) {
 442                error("No default references");
 443                show_unreachable = 0;
 444        }
 445}
 446
 447static void fsck_object_dir(const char *path)
 448{
 449        int i;
 450        for (i = 0; i < 256; i++) {
 451                static char dir[4096];
 452                sprintf(dir, "%s/%02x", path, i);
 453                fsck_dir(i, dir);
 454        }
 455        fsck_sha1_list();
 456}
 457
 458static int fsck_head_link(void)
 459{
 460        unsigned char sha1[20];
 461        const char *git_HEAD = xstrdup(git_path("HEAD"));
 462        const char *git_refs_heads_master = resolve_ref(git_HEAD, sha1, 1);
 463        int pfxlen = strlen(git_HEAD) - 4; /* strip .../.git/ part */
 464
 465        if (!git_refs_heads_master)
 466                return error("HEAD is not a symbolic ref");
 467        if (strncmp(git_refs_heads_master + pfxlen, "refs/heads/", 11))
 468                return error("HEAD points to something strange (%s)",
 469                             git_refs_heads_master + pfxlen);
 470        if (is_null_sha1(sha1))
 471                return error("HEAD: not a valid git pointer");
 472        return 0;
 473}
 474
 475static int fsck_cache_tree(struct cache_tree *it)
 476{
 477        int i;
 478        int err = 0;
 479
 480        if (0 <= it->entry_count) {
 481                struct object *obj = parse_object(it->sha1);
 482                if (!obj) {
 483                        error("%s: invalid sha1 pointer in cache-tree",
 484                              sha1_to_hex(it->sha1));
 485                        return 1;
 486                }
 487                mark_reachable(obj, REACHABLE);
 488                obj->used = 1;
 489                if (obj->type != OBJ_TREE)
 490                        err |= objerror(obj, "non-tree in cache-tree");
 491        }
 492        for (i = 0; i < it->subtree_nr; i++)
 493                err |= fsck_cache_tree(it->down[i]->cache_tree);
 494        return err;
 495}
 496
 497int main(int argc, char **argv)
 498{
 499        int i, heads;
 500
 501        track_object_refs = 1;
 502        setup_git_directory();
 503
 504        for (i = 1; i < argc; i++) {
 505                const char *arg = argv[i];
 506
 507                if (!strcmp(arg, "--unreachable")) {
 508                        show_unreachable = 1;
 509                        continue;
 510                }
 511                if (!strcmp(arg, "--tags")) {
 512                        show_tags = 1;
 513                        continue;
 514                }
 515                if (!strcmp(arg, "--root")) {
 516                        show_root = 1;
 517                        continue;
 518                }
 519                if (!strcmp(arg, "--cache")) {
 520                        keep_cache_objects = 1;
 521                        continue;
 522                }
 523                if (!strcmp(arg, "--full")) {
 524                        check_full = 1;
 525                        continue;
 526                }
 527                if (!strcmp(arg, "--strict")) {
 528                        check_strict = 1;
 529                        continue;
 530                }
 531                if (*arg == '-')
 532                        usage("git-fsck-objects [--tags] [--root] [[--unreachable] [--cache] [--full] [--strict] <head-sha1>*]");
 533        }
 534
 535        fsck_head_link();
 536        fsck_object_dir(get_object_directory());
 537        if (check_full) {
 538                struct alternate_object_database *alt;
 539                struct packed_git *p;
 540                prepare_alt_odb();
 541                for (alt = alt_odb_list; alt; alt = alt->next) {
 542                        char namebuf[PATH_MAX];
 543                        int namelen = alt->name - alt->base;
 544                        memcpy(namebuf, alt->base, namelen);
 545                        namebuf[namelen - 1] = 0;
 546                        fsck_object_dir(namebuf);
 547                }
 548                prepare_packed_git();
 549                for (p = packed_git; p; p = p->next)
 550                        /* verify gives error messages itself */
 551                        verify_pack(p, 0);
 552
 553                for (p = packed_git; p; p = p->next) {
 554                        int num = num_packed_objects(p);
 555                        for (i = 0; i < num; i++) {
 556                                unsigned char sha1[20];
 557                                nth_packed_object_sha1(p, i, sha1);
 558                                fsck_sha1(sha1);
 559                        }
 560                }
 561        }
 562
 563        heads = 0;
 564        for (i = 1; i < argc; i++) {
 565                const char *arg = argv[i]; 
 566
 567                if (*arg == '-')
 568                        continue;
 569
 570                if (!get_sha1(arg, head_sha1)) {
 571                        struct object *obj = lookup_object(head_sha1);
 572
 573                        /* Error is printed by lookup_object(). */
 574                        if (!obj)
 575                                continue;
 576
 577                        obj->used = 1;
 578                        mark_reachable(obj, REACHABLE);
 579                        heads++;
 580                        continue;
 581                }
 582                error("invalid parameter: expected sha1, got '%s'", arg);
 583        }
 584
 585        /*
 586         * If we've not been given any explicit head information, do the
 587         * default ones from .git/refs. We also consider the index file
 588         * in this case (ie this implies --cache).
 589         */
 590        if (!heads) {
 591                get_default_heads();
 592                keep_cache_objects = 1;
 593        }
 594
 595        if (keep_cache_objects) {
 596                int i;
 597                read_cache();
 598                for (i = 0; i < active_nr; i++) {
 599                        struct blob *blob = lookup_blob(active_cache[i]->sha1);
 600                        struct object *obj;
 601                        if (!blob)
 602                                continue;
 603                        obj = &blob->object;
 604                        obj->used = 1;
 605                        mark_reachable(obj, REACHABLE);
 606                }
 607                if (active_cache_tree)
 608                        fsck_cache_tree(active_cache_tree);
 609        }
 610
 611        check_connectivity();
 612        return 0;
 613}