t/t1450-fsck.sh

   1 #!/bin/sh
   2
   3 test_description='git fsck random collection of tests
   4
   5 * (HEAD) B
   6 * (master) A
   7 '
   8
   9 . ./test-lib.sh
  10
  11 test_expect_success setup '
  12         git config gc.auto 0 &&
  13         git config i18n.commitencoding ISO-8859-1 &&
  14         test_commit A fileA one &&
  15         git config --unset i18n.commitencoding &&
  16         git checkout HEAD^0 &&
  17         test_commit B fileB two &&
  18         git tag -d A B &&
  19         git reflog expire --expire=now --all
  20 '
  21
  22 test_expect_success 'loose objects borrowed from alternate are not missing' '
  23         mkdir another &&
  24         (
  25                 cd another &&
  26                 git init &&
  27                 echo ../../../.git/objects >.git/objects/info/alternates &&
  28                 test_commit C fileC one &&
  29                 git fsck --no-dangling >../actual 2>&1
  30         ) &&
  31         test_must_be_empty actual
  32 '
  33
  34 test_expect_success 'HEAD is part of refs, valid objects appear valid' '
  35         git fsck >actual 2>&1 &&
  36         test_must_be_empty actual
  37 '
  38
  39 # Corruption tests follow.  Make sure to remove all traces of the
  40 # specific corruption you test afterwards, lest a later test trip over
  41 # it.
  42
  43 test_expect_success 'setup: helpers for corruption tests' '
  44         sha1_file() {
  45                 remainder=${1#??} &&
  46                 firsttwo=${1%$remainder} &&
  47                 echo ".git/objects/$firsttwo/$remainder"
  48         } &&
  49
  50         remove_object() {
  51                 rm "$(sha1_file "$1")"
  52         }
  53 '
  54
  55 test_expect_success 'object with bad sha1' '
  56         sha=$(echo blob | git hash-object -w --stdin) &&
  57         old=$(echo $sha | sed "s+^..+&/+") &&
  58         new=$(dirname $old)/ffffffffffffffffffffffffffffffffffffff &&
  59         sha="$(dirname $new)$(basename $new)" &&
  60         mv .git/objects/$old .git/objects/$new &&
  61         test_when_finished "remove_object $sha" &&
  62         git update-index --add --cacheinfo 100644 $sha foo &&
  63         test_when_finished "git read-tree -u --reset HEAD" &&
  64         tree=$(git write-tree) &&
  65         test_when_finished "remove_object $tree" &&
  66         cmt=$(echo bogus | git commit-tree $tree) &&
  67         test_when_finished "remove_object $cmt" &&
  68         git update-ref refs/heads/bogus $cmt &&
  69         test_when_finished "git update-ref -d refs/heads/bogus" &&
  70
  71         test_must_fail git fsck 2>out &&
  72         cat out &&
  73         grep "$sha.*corrupt" out
  74 '
  75
  76 test_expect_success 'branch pointing to non-commit' '
  77         git rev-parse HEAD^{tree} >.git/refs/heads/invalid &&
  78         test_when_finished "git update-ref -d refs/heads/invalid" &&
  79         test_must_fail git fsck 2>out &&
  80         cat out &&
  81         grep "not a commit" out
  82 '
  83
  84 test_expect_success 'HEAD link pointing at a funny object' '
  85         test_when_finished "mv .git/SAVED_HEAD .git/HEAD" &&
  86         mv .git/HEAD .git/SAVED_HEAD &&
  87         echo 0000000000000000000000000000000000000000 >.git/HEAD &&
  88         # avoid corrupt/broken HEAD from interfering with repo discovery
  89         test_must_fail env GIT_DIR=.git git fsck 2>out &&
  90         cat out &&
  91         grep "detached HEAD points" out
  92 '
  93
  94 test_expect_success 'HEAD link pointing at a funny place' '
  95         test_when_finished "mv .git/SAVED_HEAD .git/HEAD" &&
  96         mv .git/HEAD .git/SAVED_HEAD &&
  97         echo "ref: refs/funny/place" >.git/HEAD &&
  98         # avoid corrupt/broken HEAD from interfering with repo discovery
  99         test_must_fail env GIT_DIR=.git git fsck 2>out &&
 100         cat out &&
 101         grep "HEAD points to something strange" out
 102 '
 103
 104 test_expect_success 'email without @ is okay' '
 105         git cat-file commit HEAD >basis &&
 106         sed "s/@/AT/" basis >okay &&
 107         new=$(git hash-object -t commit -w --stdin <okay) &&
 108         test_when_finished "remove_object $new" &&
 109         git update-ref refs/heads/bogus "$new" &&
 110         test_when_finished "git update-ref -d refs/heads/bogus" &&
 111         git fsck 2>out &&
 112         cat out &&
 113         ! grep "commit $new" out
 114 '
 115
 116 test_expect_success 'email with embedded > is not okay' '
 117         git cat-file commit HEAD >basis &&
 118         sed "s/@[a-z]/&>/" basis >bad-email &&
 119         new=$(git hash-object -t commit -w --stdin <bad-email) &&
 120         test_when_finished "remove_object $new" &&
 121         git update-ref refs/heads/bogus "$new" &&
 122         test_when_finished "git update-ref -d refs/heads/bogus" &&
 123         test_must_fail git fsck 2>out &&
 124         cat out &&
 125         grep "error in commit $new" out
 126 '
 127
 128 test_expect_success 'missing < email delimiter is reported nicely' '
 129         git cat-file commit HEAD >basis &&
 130         sed "s/<//" basis >bad-email-2 &&
 131         new=$(git hash-object -t commit -w --stdin <bad-email-2) &&
 132         test_when_finished "remove_object $new" &&
 133         git update-ref refs/heads/bogus "$new" &&
 134         test_when_finished "git update-ref -d refs/heads/bogus" &&
 135         test_must_fail git fsck 2>out &&
 136         cat out &&
 137         grep "error in commit $new.* - bad name" out
 138 '
 139
 140 test_expect_success 'missing email is reported nicely' '
 141         git cat-file commit HEAD >basis &&
 142         sed "s/[a-z]* <[^>]*>//" basis >bad-email-3 &&
 143         new=$(git hash-object -t commit -w --stdin <bad-email-3) &&
 144         test_when_finished "remove_object $new" &&
 145         git update-ref refs/heads/bogus "$new" &&
 146         test_when_finished "git update-ref -d refs/heads/bogus" &&
 147         test_must_fail git fsck 2>out &&
 148         cat out &&
 149         grep "error in commit $new.* - missing email" out
 150 '
 151
 152 test_expect_success '> in name is reported' '
 153         git cat-file commit HEAD >basis &&
 154         sed "s/ </> </" basis >bad-email-4 &&
 155         new=$(git hash-object -t commit -w --stdin <bad-email-4) &&
 156         test_when_finished "remove_object $new" &&
 157         git update-ref refs/heads/bogus "$new" &&
 158         test_when_finished "git update-ref -d refs/heads/bogus" &&
 159         test_must_fail git fsck 2>out &&
 160         cat out &&
 161         grep "error in commit $new" out
 162 '
 163
 164 # date is 2^64 + 1
 165 test_expect_success 'integer overflow in timestamps is reported' '
 166         git cat-file commit HEAD >basis &&
 167         sed "s/^\\(author .*>\\) [0-9]*/\\1 18446744073709551617/" \
 168                 <basis >bad-timestamp &&
 169         new=$(git hash-object -t commit -w --stdin <bad-timestamp) &&
 170         test_when_finished "remove_object $new" &&
 171         git update-ref refs/heads/bogus "$new" &&
 172         test_when_finished "git update-ref -d refs/heads/bogus" &&
 173         test_must_fail git fsck 2>out &&
 174         cat out &&
 175         grep "error in commit $new.*integer overflow" out
 176 '
 177
 178 test_expect_success 'commit with NUL in header' '
 179         git cat-file commit HEAD >basis &&
 180         sed "s/author ./author Q/" <basis | q_to_nul >commit-NUL-header &&
 181         new=$(git hash-object -t commit -w --stdin <commit-NUL-header) &&
 182         test_when_finished "remove_object $new" &&
 183         git update-ref refs/heads/bogus "$new" &&
 184         test_when_finished "git update-ref -d refs/heads/bogus" &&
 185         test_must_fail git fsck 2>out &&
 186         cat out &&
 187         grep "error in commit $new.*unterminated header: NUL at offset" out
 188 '
 189
 190 test_expect_success 'tree object with duplicate entries' '
 191         test_when_finished "for i in \$T; do remove_object \$i; done" &&
 192         T=$(
 193                 GIT_INDEX_FILE=test-index &&
 194                 export GIT_INDEX_FILE &&
 195                 rm -f test-index &&
 196                 >x &&
 197                 git add x &&
 198                 git rev-parse :x &&
 199                 T=$(git write-tree) &&
 200                 echo $T &&
 201                 (
 202                         git cat-file tree $T &&
 203                         git cat-file tree $T
 204                 ) |
 205                 git hash-object -w -t tree --stdin
 206         ) &&
 207         test_must_fail git fsck 2>out &&
 208         grep "error in tree .*contains duplicate file entries" out
 209 '
 210
 211 test_expect_success 'unparseable tree object' '
 212         test_when_finished "git update-ref -d refs/heads/wrong" &&
 213         test_when_finished "remove_object \$tree_sha1" &&
 214         test_when_finished "remove_object \$commit_sha1" &&
 215         tree_sha1=$(printf "100644 \0twenty-bytes-of-junk" | git hash-object -t tree --stdin -w --literally) &&
 216         commit_sha1=$(git commit-tree $tree_sha1) &&
 217         git update-ref refs/heads/wrong $commit_sha1 &&
 218         test_must_fail git fsck 2>out &&
 219         test_i18ngrep "error: empty filename in tree entry" out &&
 220         test_i18ngrep "$tree_sha1" out &&
 221         test_i18ngrep ! "fatal: empty filename in tree entry" out
 222 '
 223
 224 hex2oct() {
 225         perl -ne 'printf "\\%03o", hex for /../g'
 226 }
 227
 228 test_expect_success 'tree entry with type mismatch' '
 229         test_when_finished "remove_object \$blob" &&
 230         test_when_finished "remove_object \$tree" &&
 231         test_when_finished "remove_object \$commit" &&
 232         test_when_finished "git update-ref -d refs/heads/type_mismatch" &&
 233         blob=$(echo blob | git hash-object -w --stdin) &&
 234         blob_bin=$(echo $blob | hex2oct) &&
 235         tree=$(
 236                 printf "40000 dir\0${blob_bin}100644 file\0${blob_bin}" |
 237                 git hash-object -t tree --stdin -w --literally
 238         ) &&
 239         commit=$(git commit-tree $tree) &&
 240         git update-ref refs/heads/type_mismatch $commit &&
 241         test_must_fail git fsck >out 2>&1 &&
 242         test_i18ngrep "is a blob, not a tree" out &&
 243         test_i18ngrep ! "dangling blob" out
 244 '
 245
 246 test_expect_success 'tag pointing to nonexistent' '
 247         cat >invalid-tag <<-\EOF &&
 248         object ffffffffffffffffffffffffffffffffffffffff
 249         type commit
 250         tag invalid
 251         tagger T A Gger <tagger@example.com> 1234567890 -0000
 252
 253         This is an invalid tag.
 254         EOF
 255
 256         tag=$(git hash-object -t tag -w --stdin <invalid-tag) &&
 257         test_when_finished "remove_object $tag" &&
 258         echo $tag >.git/refs/tags/invalid &&
 259         test_when_finished "git update-ref -d refs/tags/invalid" &&
 260         test_must_fail git fsck --tags >out &&
 261         cat out &&
 262         grep "broken link" out
 263 '
 264
 265 test_expect_success 'tag pointing to something else than its type' '
 266         sha=$(echo blob | git hash-object -w --stdin) &&
 267         test_when_finished "remove_object $sha" &&
 268         cat >wrong-tag <<-EOF &&
 269         object $sha
 270         type commit
 271         tag wrong
 272         tagger T A Gger <tagger@example.com> 1234567890 -0000
 273
 274         This is an invalid tag.
 275         EOF
 276
 277         tag=$(git hash-object -t tag -w --stdin <wrong-tag) &&
 278         test_when_finished "remove_object $tag" &&
 279         echo $tag >.git/refs/tags/wrong &&
 280         test_when_finished "git update-ref -d refs/tags/wrong" &&
 281         test_must_fail git fsck --tags
 282 '
 283
 284 test_expect_success 'tag with incorrect tag name & missing tagger' '
 285         sha=$(git rev-parse HEAD) &&
 286         cat >wrong-tag <<-EOF &&
 287         object $sha
 288         type commit
 289         tag wrong name format
 290
 291         This is an invalid tag.
 292         EOF
 293
 294         tag=$(git hash-object -t tag -w --stdin <wrong-tag) &&
 295         test_when_finished "remove_object $tag" &&
 296         echo $tag >.git/refs/tags/wrong &&
 297         test_when_finished "git update-ref -d refs/tags/wrong" &&
 298         git fsck --tags 2>out &&
 299
 300         cat >expect <<-EOF &&
 301         warning in tag $tag: badTagName: invalid '\''tag'\'' name: wrong name format
 302         warning in tag $tag: missingTaggerEntry: invalid format - expected '\''tagger'\'' line
 303         EOF
 304         test_cmp expect out
 305 '
 306
 307 test_expect_success 'tag with bad tagger' '
 308         sha=$(git rev-parse HEAD) &&
 309         cat >wrong-tag <<-EOF &&
 310         object $sha
 311         type commit
 312         tag not-quite-wrong
 313         tagger Bad Tagger Name
 314
 315         This is an invalid tag.
 316         EOF
 317
 318         tag=$(git hash-object --literally -t tag -w --stdin <wrong-tag) &&
 319         test_when_finished "remove_object $tag" &&
 320         echo $tag >.git/refs/tags/wrong &&
 321         test_when_finished "git update-ref -d refs/tags/wrong" &&
 322         test_must_fail git fsck --tags 2>out &&
 323         grep "error in tag .*: invalid author/committer" out
 324 '
 325
 326 test_expect_success 'tag with NUL in header' '
 327         sha=$(git rev-parse HEAD) &&
 328         q_to_nul >tag-NUL-header <<-EOF &&
 329         object $sha
 330         type commit
 331         tag contains-Q-in-header
 332         tagger T A Gger <tagger@example.com> 1234567890 -0000
 333
 334         This is an invalid tag.
 335         EOF
 336
 337         tag=$(git hash-object --literally -t tag -w --stdin <tag-NUL-header) &&
 338         test_when_finished "remove_object $tag" &&
 339         echo $tag >.git/refs/tags/wrong &&
 340         test_when_finished "git update-ref -d refs/tags/wrong" &&
 341         test_must_fail git fsck --tags 2>out &&
 342         cat out &&
 343         grep "error in tag $tag.*unterminated header: NUL at offset" out
 344 '
 345
 346 test_expect_success 'cleaned up' '
 347         git fsck >actual 2>&1 &&
 348         test_must_be_empty actual
 349 '
 350
 351 test_expect_success 'rev-list --verify-objects' '
 352         git rev-list --verify-objects --all >/dev/null 2>out &&
 353         test_must_be_empty out
 354 '
 355
 356 test_expect_success 'rev-list --verify-objects with bad sha1' '
 357         sha=$(echo blob | git hash-object -w --stdin) &&
 358         old=$(echo $sha | sed "s+^..+&/+") &&
 359         new=$(dirname $old)/ffffffffffffffffffffffffffffffffffffff &&
 360         sha="$(dirname $new)$(basename $new)" &&
 361         mv .git/objects/$old .git/objects/$new &&
 362         test_when_finished "remove_object $sha" &&
 363         git update-index --add --cacheinfo 100644 $sha foo &&
 364         test_when_finished "git read-tree -u --reset HEAD" &&
 365         tree=$(git write-tree) &&
 366         test_when_finished "remove_object $tree" &&
 367         cmt=$(echo bogus | git commit-tree $tree) &&
 368         test_when_finished "remove_object $cmt" &&
 369         git update-ref refs/heads/bogus $cmt &&
 370         test_when_finished "git update-ref -d refs/heads/bogus" &&
 371
 372         test_might_fail git rev-list --verify-objects refs/heads/bogus >/dev/null 2>out &&
 373         cat out &&
 374         test_i18ngrep -q "error: sha1 mismatch 63ffffffffffffffffffffffffffffffffffffff" out
 375 '
 376
 377 test_expect_success 'force fsck to ignore double author' '
 378         git cat-file commit HEAD >basis &&
 379         sed "s/^author .*/&,&/" <basis | tr , \\n >multiple-authors &&
 380         new=$(git hash-object -t commit -w --stdin <multiple-authors) &&
 381         test_when_finished "remove_object $new" &&
 382         git update-ref refs/heads/bogus "$new" &&
 383         test_when_finished "git update-ref -d refs/heads/bogus" &&
 384         test_must_fail git fsck &&
 385         git -c fsck.multipleAuthors=ignore fsck
 386 '
 387
 388 _bz='\0'
 389 _bz5="$_bz$_bz$_bz$_bz$_bz"
 390 _bz20="$_bz5$_bz5$_bz5$_bz5"
 391
 392 test_expect_success 'fsck notices blob entry pointing to null sha1' '
 393         (git init null-blob &&
 394          cd null-blob &&
 395          sha=$(printf "100644 file$_bz$_bz20" |
 396                git hash-object -w --stdin -t tree) &&
 397           git fsck 2>out &&
 398           cat out &&
 399           grep "warning.*null sha1" out
 400         )
 401 '
 402
 403 test_expect_success 'fsck notices submodule entry pointing to null sha1' '
 404         (git init null-commit &&
 405          cd null-commit &&
 406          sha=$(printf "160000 submodule$_bz$_bz20" |
 407                git hash-object -w --stdin -t tree) &&
 408           git fsck 2>out &&
 409           cat out &&
 410           grep "warning.*null sha1" out
 411         )
 412 '
 413
 414 while read name path pretty; do
 415         while read mode type; do
 416                 : ${pretty:=$path}
 417                 test_expect_success "fsck notices $pretty as $type" '
 418                 (
 419                         git init $name-$type &&
 420                         cd $name-$type &&
 421                         echo content >file &&
 422                         git add file &&
 423                         git commit -m base &&
 424                         blob=$(git rev-parse :file) &&
 425                         tree=$(git rev-parse HEAD^{tree}) &&
 426                         value=$(eval "echo \$$type") &&
 427                         printf "$mode $type %s\t%s" "$value" "$path" >bad &&
 428                         bad_tree=$(git mktree <bad) &&
 429                         git fsck 2>out &&
 430                         cat out &&
 431                         grep "warning.*tree $bad_tree" out
 432                 )'
 433         done <<-\EOF
 434         100644 blob
 435         040000 tree
 436         EOF
 437 done <<-EOF
 438 dot .
 439 dotdot ..
 440 dotgit .git
 441 dotgit-case .GIT
 442 dotgit-unicode .gI${u200c}T .gI{u200c}T
 443 dotgit-case2 .Git
 444 git-tilde1 git~1
 445 dotgitdot .git.
 446 dot-backslash-case .\\\\.GIT\\\\foobar
 447 dotgit-case-backslash .git\\\\foobar
 448 EOF
 449
 450 test_expect_success 'fsck allows .Ňit' '
 451         (
 452                 git init not-dotgit &&
 453                 cd not-dotgit &&
 454                 echo content >file &&
 455                 git add file &&
 456                 git commit -m base &&
 457                 blob=$(git rev-parse :file) &&
 458                 printf "100644 blob $blob\t.\\305\\207it" >tree &&
 459                 tree=$(git mktree <tree) &&
 460                 git fsck 2>err &&
 461                 test_line_count = 0 err
 462         )
 463 '
 464
 465 test_expect_success 'NUL in commit' '
 466         rm -fr nul-in-commit &&
 467         git init nul-in-commit &&
 468         (
 469                 cd nul-in-commit &&
 470                 git commit --allow-empty -m "initial commitQNUL after message" &&
 471                 git cat-file commit HEAD >original &&
 472                 q_to_nul <original >munged &&
 473                 git hash-object -w -t commit --stdin <munged >name &&
 474                 git branch bad $(cat name) &&
 475
 476                 test_must_fail git -c fsck.nulInCommit=error fsck 2>warn.1 &&
 477                 grep nulInCommit warn.1 &&
 478                 git fsck 2>warn.2 &&
 479                 grep nulInCommit warn.2
 480         )
 481 '
 482
 483 # create a static test repo which is broken by omitting
 484 # one particular object ($1, which is looked up via rev-parse
 485 # in the new repository).
 486 create_repo_missing () {
 487         rm -rf missing &&
 488         git init missing &&
 489         (
 490                 cd missing &&
 491                 git commit -m one --allow-empty &&
 492                 mkdir subdir &&
 493                 echo content >subdir/file &&
 494                 git add subdir/file &&
 495                 git commit -m two &&
 496                 unrelated=$(echo unrelated | git hash-object --stdin -w) &&
 497                 git tag -m foo tag $unrelated &&
 498                 sha1=$(git rev-parse --verify "$1") &&
 499                 path=$(echo $sha1 | sed 's|..|&/|') &&
 500                 rm .git/objects/$path
 501         )
 502 }
 503
 504 test_expect_success 'fsck notices missing blob' '
 505         create_repo_missing HEAD:subdir/file &&
 506         test_must_fail git -C missing fsck
 507 '
 508
 509 test_expect_success 'fsck notices missing subtree' '
 510         create_repo_missing HEAD:subdir &&
 511         test_must_fail git -C missing fsck
 512 '
 513
 514 test_expect_success 'fsck notices missing root tree' '
 515         create_repo_missing HEAD^{tree} &&
 516         test_must_fail git -C missing fsck
 517 '
 518
 519 test_expect_success 'fsck notices missing parent' '
 520         create_repo_missing HEAD^ &&
 521         test_must_fail git -C missing fsck
 522 '
 523
 524 test_expect_success 'fsck notices missing tagged object' '
 525         create_repo_missing tag^{blob} &&
 526         test_must_fail git -C missing fsck
 527 '
 528
 529 test_expect_success 'fsck notices ref pointing to missing commit' '
 530         create_repo_missing HEAD &&
 531         test_must_fail git -C missing fsck
 532 '
 533
 534 test_expect_success 'fsck notices ref pointing to missing tag' '
 535         create_repo_missing tag &&
 536         test_must_fail git -C missing fsck
 537 '
 538
 539 test_expect_success 'fsck --connectivity-only' '
 540         rm -rf connectivity-only &&
 541         git init connectivity-only &&
 542         (
 543                 cd connectivity-only &&
 544                 touch empty &&
 545                 git add empty &&
 546                 test_commit empty &&
 547
 548                 # Drop the index now; we want to be sure that we
 549                 # recursively notice the broken objects
 550                 # because they are reachable from refs, not because
 551                 # they are in the index.
 552                 rm -f .git/index &&
 553
 554                 # corrupt the blob, but in a way that we can still identify
 555                 # its type. That lets us see that --connectivity-only is
 556                 # not actually looking at the contents, but leaves it
 557                 # free to examine the type if it chooses.
 558                 empty=.git/objects/e6/9de29bb2d1d6434b8b29ae775ad8c2e48c5391 &&
 559                 blob=$(echo unrelated | git hash-object -w --stdin) &&
 560                 mv -f $(sha1_file $blob) $empty &&
 561
 562                 test_must_fail git fsck --strict &&
 563                 git fsck --strict --connectivity-only &&
 564                 tree=$(git rev-parse HEAD:) &&
 565                 suffix=${tree#??} &&
 566                 tree=.git/objects/${tree%$suffix}/$suffix &&
 567                 rm -f $tree &&
 568                 echo invalid >$tree &&
 569                 test_must_fail git fsck --strict --connectivity-only
 570         )
 571 '
 572
 573 test_expect_success 'fsck --connectivity-only with explicit head' '
 574         rm -rf connectivity-only &&
 575         git init connectivity-only &&
 576         (
 577                 cd connectivity-only &&
 578                 test_commit foo &&
 579                 rm -f .git/index &&
 580                 tree=$(git rev-parse HEAD^{tree}) &&
 581                 remove_object $(git rev-parse HEAD:foo.t) &&
 582                 test_must_fail git fsck --connectivity-only $tree
 583         )
 584 '
 585
 586 test_expect_success 'fsck --name-objects' '
 587         rm -rf name-objects &&
 588         git init name-objects &&
 589         (
 590                 cd name-objects &&
 591                 test_commit julius caesar.t &&
 592                 test_commit augustus &&
 593                 test_commit caesar &&
 594                 remove_object $(git rev-parse julius:caesar.t) &&
 595                 test_must_fail git fsck --name-objects >out &&
 596                 tree=$(git rev-parse --verify julius:) &&
 597                 egrep "$tree \((refs/heads/master|HEAD)@\{[0-9]*\}:" out
 598         )
 599 '
 600
 601 test_expect_success 'alternate objects are correctly blamed' '
 602         test_when_finished "rm -rf alt.git .git/objects/info/alternates" &&
 603         git init --bare alt.git &&
 604         echo "../../alt.git/objects" >.git/objects/info/alternates &&
 605         mkdir alt.git/objects/12 &&
 606         >alt.git/objects/12/34567890123456789012345678901234567890 &&
 607         test_must_fail git fsck >out 2>&1 &&
 608         grep alt.git out
 609 '
 610
 611 test_expect_success 'fsck errors in packed objects' '
 612         git cat-file commit HEAD >basis &&
 613         sed "s/</one/" basis >one &&
 614         sed "s/</foo/" basis >two &&
 615         one=$(git hash-object -t commit -w one) &&
 616         two=$(git hash-object -t commit -w two) &&
 617         pack=$(
 618                 {
 619                         echo $one &&
 620                         echo $two
 621                 } | git pack-objects .git/objects/pack/pack
 622         ) &&
 623         test_when_finished "rm -f .git/objects/pack/pack-$pack.*" &&
 624         remove_object $one &&
 625         remove_object $two &&
 626         test_must_fail git fsck 2>out &&
 627         grep "error in commit $one.* - bad name" out &&
 628         grep "error in commit $two.* - bad name" out &&
 629         ! grep corrupt out
 630 '
 631
 632 test_expect_success 'fsck fails on corrupt packfile' '
 633         hsh=$(git commit-tree -m mycommit HEAD^{tree}) &&
 634         pack=$(echo $hsh | git pack-objects .git/objects/pack/pack) &&
 635
 636         # Corrupt the first byte of the first object. (It contains 3 type bits,
 637         # at least one of which is not zero, so setting the first byte to 0 is
 638         # sufficient.)
 639         chmod a+w .git/objects/pack/pack-$pack.pack &&
 640         printf '\0' | dd of=.git/objects/pack/pack-$pack.pack bs=1 conv=notrunc seek=12 &&
 641
 642         test_when_finished "rm -f .git/objects/pack/pack-$pack.*" &&
 643         remove_object $hsh &&
 644         test_must_fail git fsck 2>out &&
 645         test_i18ngrep "checksum mismatch" out
 646 '
 647
 648 test_expect_success 'fsck finds problems in duplicate loose objects' '
 649         rm -rf broken-duplicate &&
 650         git init broken-duplicate &&
 651         (
 652                 cd broken-duplicate &&
 653                 test_commit duplicate &&
 654                 # no "-d" here, so we end up with duplicates
 655                 git repack &&
 656                 # now corrupt the loose copy
 657                 file=$(sha1_file "$(git rev-parse HEAD)") &&
 658                 rm "$file" &&
 659                 echo broken >"$file" &&
 660                 test_must_fail git fsck
 661         )
 662 '
 663
 664 test_expect_success 'fsck detects trailing loose garbage (commit)' '
 665         git cat-file commit HEAD >basis &&
 666         echo bump-commit-sha1 >>basis &&
 667         commit=$(git hash-object -w -t commit basis) &&
 668         file=$(sha1_file $commit) &&
 669         test_when_finished "remove_object $commit" &&
 670         chmod +w "$file" &&
 671         echo garbage >>"$file" &&
 672         test_must_fail git fsck 2>out &&
 673         test_i18ngrep "garbage.*$commit" out
 674 '
 675
 676 test_expect_success 'fsck detects trailing loose garbage (blob)' '
 677         blob=$(echo trailing | git hash-object -w --stdin) &&
 678         file=$(sha1_file $blob) &&
 679         test_when_finished "remove_object $blob" &&
 680         chmod +w "$file" &&
 681         echo garbage >>"$file" &&
 682         test_must_fail git fsck 2>out &&
 683         test_i18ngrep "garbage.*$blob" out
 684 '
 685
 686 # for each of type, we have one version which is referenced by another object
 687 # (and so while unreachable, not dangling), and another variant which really is
 688 # dangling.
 689 test_expect_success 'fsck notices dangling objects' '
 690         git init dangling &&
 691         (
 692                 cd dangling &&
 693                 blob=$(echo not-dangling | git hash-object -w --stdin) &&
 694                 dblob=$(echo dangling | git hash-object -w --stdin) &&
 695                 tree=$(printf "100644 blob %s\t%s\n" $blob one | git mktree) &&
 696                 dtree=$(printf "100644 blob %s\t%s\n" $blob two | git mktree) &&
 697                 commit=$(git commit-tree $tree) &&
 698                 dcommit=$(git commit-tree -p $commit $tree) &&
 699
 700                 cat >expect <<-EOF &&
 701                 dangling blob $dblob
 702                 dangling commit $dcommit
 703                 dangling tree $dtree
 704                 EOF
 705
 706                 git fsck >actual &&
 707                 # the output order is non-deterministic, as it comes from a hash
 708                 sort <actual >actual.sorted &&
 709                 test_cmp expect actual.sorted
 710         )
 711 '
 712
 713 test_expect_success 'fsck $name notices bogus $name' '
 714         test_must_fail git fsck bogus &&
 715         test_must_fail git fsck $ZERO_OID
 716 '
 717
 718 test_expect_success 'bogus head does not fallback to all heads' '
 719         # set up a case that will cause a reachability complaint
 720         echo to-be-deleted >foo &&
 721         git add foo &&
 722         blob=$(git rev-parse :foo) &&
 723         test_when_finished "git rm --cached foo" &&
 724         remove_object $blob &&
 725         test_must_fail git fsck $ZERO_OID >out 2>&1 &&
 726         ! grep $blob out
 727 '
 728
 729 # Corrupt the checksum on the index.
 730 # Add 1 to the last byte in the SHA.
 731 corrupt_index_checksum () {
 732     perl -w -e '
 733         use Fcntl ":seek";
 734         open my $fh, "+<", ".git/index" or die "open: $!";
 735         binmode $fh;
 736         seek $fh, -1, SEEK_END or die "seek: $!";
 737         read $fh, my $in_byte, 1 or die "read: $!";
 738
 739         $in_value = unpack("C", $in_byte);
 740         $out_value = ($in_value + 1) & 255;
 741
 742         $out_byte = pack("C", $out_value);
 743
 744         seek $fh, -1, SEEK_END or die "seek: $!";
 745         print $fh $out_byte;
 746         close $fh or die "close: $!";
 747     '
 748 }
 749
 750 # Corrupt the checksum on the index and then
 751 # verify that only fsck notices.
 752 test_expect_success 'detect corrupt index file in fsck' '
 753         cp .git/index .git/index.backup &&
 754         test_when_finished "mv .git/index.backup .git/index" &&
 755         corrupt_index_checksum &&
 756         test_must_fail git fsck --cache 2>errors &&
 757         grep "bad index file" errors
 758 '
 759
 760 test_done