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+#!/bin/sh
+
+test_description='
+Test pruning of repositories with minor corruptions. The goal
+here is that we should always be erring on the side of safety. So
+if we see, for example, a ref with a bogus name, it is OK either to
+bail out or to proceed using it as a reachable tip, but it is _not_
+OK to proceed as if it did not exist. Otherwise we might silently
+delete objects that cannot be recovered.
+'
+. ./test-lib.sh
+
+test_expect_success 'disable reflogs' '
+ git config core.logallrefupdates false &&
+ git reflog expire --expire=all --all
+'
+
+test_expect_success 'create history reachable only from a bogus-named ref' '
+ test_tick && git commit --allow-empty -m master &&
+ base=$(git rev-parse HEAD) &&
+ test_tick && git commit --allow-empty -m bogus &&
+ bogus=$(git rev-parse HEAD) &&
+ git cat-file commit $bogus >saved &&
+ echo $bogus >.git/refs/heads/bogus..name &&
+ git reset --hard HEAD^
+'
+
+test_expect_success 'pruning does not drop bogus object' '
+ test_when_finished "git hash-object -w -t commit saved" &&
+ test_might_fail git prune --expire=now &&
+ verbose git cat-file -e $bogus
+'
+
+test_expect_success 'put bogus object into pack' '
+ git tag reachable $bogus &&
+ git repack -ad &&
+ git tag -d reachable &&
+ verbose git cat-file -e $bogus
+'
+
+test_expect_success 'destructive repack keeps packed object' '
+ test_might_fail git repack -Ad --unpack-unreachable=now &&
+ verbose git cat-file -e $bogus &&
+ test_might_fail git repack -ad &&
+ verbose git cat-file -e $bogus
+'
+
+# subsequent tests will have different corruptions
+test_expect_success 'clean up bogus ref' '
+ rm .git/refs/heads/bogus..name
+'
+
+# We create two new objects here, "one" and "two". Our
+# master branch points to "two", which is deleted,
+# corrupting the repository. But we'd like to make sure
+# that the otherwise unreachable "one" is not pruned
+# (since it is the user's best bet for recovering
+# from the corruption).
+#
+# Note that we also point HEAD somewhere besides "two",
+# as we want to make sure we test the case where we
+# pick up the reference to "two" by iterating the refs,
+# not by resolving HEAD.
+test_expect_success 'create history with missing tip commit' '
+ test_tick && git commit --allow-empty -m one &&
+ recoverable=$(git rev-parse HEAD) &&
+ git cat-file commit $recoverable >saved &&
+ test_tick && git commit --allow-empty -m two &&
+ missing=$(git rev-parse HEAD) &&
+ git checkout --detach $base &&
+ rm .git/objects/$(echo $missing | sed "s,..,&/,") &&
+ test_must_fail git cat-file -e $missing
+'
+
+test_expect_success 'pruning with a corrupted tip does not drop history' '
+ test_when_finished "git hash-object -w -t commit saved" &&
+ test_might_fail git prune --expire=now &&
+ verbose git cat-file -e $recoverable
+'
+
+test_expect_success 'pack-refs does not silently delete broken loose ref' '
+ git pack-refs --all --prune &&
+ echo $missing >expect &&
+ git rev-parse refs/heads/master >actual &&
+ test_cmp expect actual
+'
+
+# we do not want to count on running pack-refs to
+# actually pack it, as it is perfectly reasonable to
+# skip processing a broken ref
+test_expect_success 'create packed-refs file with broken ref' '
+ rm -f .git/refs/heads/master &&
+ cat >.git/packed-refs <<-EOF &&
+ $missing refs/heads/master
+ $recoverable refs/heads/other
+ EOF
+ echo $missing >expect &&
+ git rev-parse refs/heads/master >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'pack-refs does not silently delete broken packed ref' '
+ git pack-refs --all --prune &&
+ git rev-parse refs/heads/master >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'pack-refs does not drop broken refs during deletion' '
+ git update-ref -d refs/heads/other &&
+ git rev-parse refs/heads/master >actual &&
+ test_cmp expect actual
+'
+
+test_done