t/t5312-prune-corruption.sh

   1 #!/bin/sh
   2
   3 test_description='
   4 Test pruning of repositories with minor corruptions. The goal
   5 here is that we should always be erring on the side of safety. So
   6 if we see, for example, a ref with a bogus name, it is OK either to
   7 bail out or to proceed using it as a reachable tip, but it is _not_
   8 OK to proceed as if it did not exist. Otherwise we might silently
   9 delete objects that cannot be recovered.
  10 '
  11 . ./test-lib.sh
  12
  13 test_expect_success 'disable reflogs' '
  14         git config core.logallrefupdates false &&
  15         git reflog expire --expire=all --all
  16 '
  17
  18 test_expect_success 'create history reachable only from a bogus-named ref' '
  19         test_tick && git commit --allow-empty -m master &&
  20         base=$(git rev-parse HEAD) &&
  21         test_tick && git commit --allow-empty -m bogus &&
  22         bogus=$(git rev-parse HEAD) &&
  23         git cat-file commit $bogus >saved &&
  24         echo $bogus >.git/refs/heads/bogus..name &&
  25         git reset --hard HEAD^
  26 '
  27
  28 test_expect_success 'pruning does not drop bogus object' '
  29         test_when_finished "git hash-object -w -t commit saved" &&
  30         test_might_fail git prune --expire=now &&
  31         verbose git cat-file -e $bogus
  32 '
  33
  34 test_expect_success 'put bogus object into pack' '
  35         git tag reachable $bogus &&
  36         git repack -ad &&
  37         git tag -d reachable &&
  38         verbose git cat-file -e $bogus
  39 '
  40
  41 test_expect_success 'destructive repack keeps packed object' '
  42         test_might_fail git repack -Ad --unpack-unreachable=now &&
  43         verbose git cat-file -e $bogus &&
  44         test_might_fail git repack -ad &&
  45         verbose git cat-file -e $bogus
  46 '
  47
  48 # subsequent tests will have different corruptions
  49 test_expect_success 'clean up bogus ref' '
  50         rm .git/refs/heads/bogus..name
  51 '
  52
  53 # We create two new objects here, "one" and "two". Our
  54 # master branch points to "two", which is deleted,
  55 # corrupting the repository. But we'd like to make sure
  56 # that the otherwise unreachable "one" is not pruned
  57 # (since it is the user's best bet for recovering
  58 # from the corruption).
  59 #
  60 # Note that we also point HEAD somewhere besides "two",
  61 # as we want to make sure we test the case where we
  62 # pick up the reference to "two" by iterating the refs,
  63 # not by resolving HEAD.
  64 test_expect_success 'create history with missing tip commit' '
  65         test_tick && git commit --allow-empty -m one &&
  66         recoverable=$(git rev-parse HEAD) &&
  67         git cat-file commit $recoverable >saved &&
  68         test_tick && git commit --allow-empty -m two &&
  69         missing=$(git rev-parse HEAD) &&
  70         git checkout --detach $base &&
  71         rm .git/objects/$(echo $missing | sed "s,..,&/,") &&
  72         test_must_fail git cat-file -e $missing
  73 '
  74
  75 test_expect_success 'pruning with a corrupted tip does not drop history' '
  76         test_when_finished "git hash-object -w -t commit saved" &&
  77         test_might_fail git prune --expire=now &&
  78         verbose git cat-file -e $recoverable
  79 '
  80
  81 test_expect_success 'pack-refs does not silently delete broken loose ref' '
  82         git pack-refs --all --prune &&
  83         echo $missing >expect &&
  84         git rev-parse refs/heads/master >actual &&
  85         test_cmp expect actual
  86 '
  87
  88 # we do not want to count on running pack-refs to
  89 # actually pack it, as it is perfectly reasonable to
  90 # skip processing a broken ref
  91 test_expect_success 'create packed-refs file with broken ref' '
  92         rm -f .git/refs/heads/master &&
  93         cat >.git/packed-refs <<-EOF &&
  94         $missing refs/heads/master
  95         $recoverable refs/heads/other
  96         EOF
  97         echo $missing >expect &&
  98         git rev-parse refs/heads/master >actual &&
  99         test_cmp expect actual
 100 '
 101
 102 test_expect_success 'pack-refs does not silently delete broken packed ref' '
 103         git pack-refs --all --prune &&
 104         git rev-parse refs/heads/master >actual &&
 105         test_cmp expect actual
 106 '
 107
 108 test_expect_success 'pack-refs does not drop broken refs during deletion' '
 109         git update-ref -d refs/heads/other &&
 110         git rev-parse refs/heads/master >actual &&
 111         test_cmp expect actual
 112 '
 113
 114 test_done