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 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
  12 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
  13
  14 . ./test-lib.sh
  15
  16 test_expect_success 'disable reflogs' '
  17         git config core.logallrefupdates false &&
  18         git reflog expire --expire=all --all
  19 '
  20
  21 test_expect_success 'create history reachable only from a bogus-named ref' '
  22         test_tick && git commit --allow-empty -m main &&
  23         base=$(git rev-parse HEAD) &&
  24         test_tick && git commit --allow-empty -m bogus &&
  25         bogus=$(git rev-parse HEAD) &&
  26         git cat-file commit $bogus >saved &&
  27         echo $bogus >.git/refs/heads/bogus..name &&
  28         git reset --hard HEAD^
  29 '
  30
  31 test_expect_success 'pruning does not drop bogus object' '
  32         test_when_finished "git hash-object -w -t commit saved" &&
  33         test_might_fail git prune --expire=now &&
  34         verbose git cat-file -e $bogus
  35 '
  36
  37 test_expect_success 'put bogus object into pack' '
  38         git tag reachable $bogus &&
  39         git repack -ad &&
  40         git tag -d reachable &&
  41         verbose git cat-file -e $bogus
  42 '
  43
  44 test_expect_success 'destructive repack keeps packed object' '
  45         test_might_fail git repack -Ad --unpack-unreachable=now &&
  46         verbose git cat-file -e $bogus &&
  47         test_might_fail git repack -ad &&
  48         verbose git cat-file -e $bogus
  49 '
  50
  51 # subsequent tests will have different corruptions
  52 test_expect_success 'clean up bogus ref' '
  53         rm .git/refs/heads/bogus..name
  54 '
  55
  56 # We create two new objects here, "one" and "two". Our
  57 # main branch points to "two", which is deleted,
  58 # corrupting the repository. But we'd like to make sure
  59 # that the otherwise unreachable "one" is not pruned
  60 # (since it is the user's best bet for recovering
  61 # from the corruption).
  62 #
  63 # Note that we also point HEAD somewhere besides "two",
  64 # as we want to make sure we test the case where we
  65 # pick up the reference to "two" by iterating the refs,
  66 # not by resolving HEAD.
  67 test_expect_success 'create history with missing tip commit' '
  68         test_tick && git commit --allow-empty -m one &&
  69         recoverable=$(git rev-parse HEAD) &&
  70         git cat-file commit $recoverable >saved &&
  71         test_tick && git commit --allow-empty -m two &&
  72         missing=$(git rev-parse HEAD) &&
  73         git checkout --detach $base &&
  74         rm .git/objects/$(echo $missing | sed "s,..,&/,") &&
  75         test_must_fail git cat-file -e $missing
  76 '
  77
  78 test_expect_success 'pruning with a corrupted tip does not drop history' '
  79         test_when_finished "git hash-object -w -t commit saved" &&
  80         test_might_fail git prune --expire=now &&
  81         verbose git cat-file -e $recoverable
  82 '
  83
  84 test_expect_success 'pack-refs does not silently delete broken loose ref' '
  85         git pack-refs --all --prune &&
  86         echo $missing >expect &&
  87         git rev-parse refs/heads/main >actual &&
  88         test_cmp expect actual
  89 '
  90
  91 # we do not want to count on running pack-refs to
  92 # actually pack it, as it is perfectly reasonable to
  93 # skip processing a broken ref
  94 test_expect_success 'create packed-refs file with broken ref' '
  95         rm -f .git/refs/heads/main &&
  96         cat >.git/packed-refs <<-EOF &&
  97         $missing refs/heads/main
  98         $recoverable refs/heads/other
  99         EOF
 100         echo $missing >expect &&
 101         git rev-parse refs/heads/main >actual &&
 102         test_cmp expect actual
 103 '
 104
 105 test_expect_success 'pack-refs does not silently delete broken packed ref' '
 106         git pack-refs --all --prune &&
 107         git rev-parse refs/heads/main >actual &&
 108         test_cmp expect actual
 109 '
 110
 111 test_expect_success 'pack-refs does not drop broken refs during deletion' '
 112         git update-ref -d refs/heads/other &&
 113         git rev-parse refs/heads/main >actual &&
 114         test_cmp expect actual
 115 '
 116
 117 test_done