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![Jeff King](/assets/img/avatar_default.png)
While parsing the parents of a commit, if we are able to parse an actual oid but lookup_commit() fails on it (because we previously saw it in this process as a different object type), we silently omit the parent and do not report any error to the caller. The caller has no way of knowing this happened, because even an empty parent list is a valid parse result. As a result, it's possible to fool our "rev-list" connectivity check into accepting a corrupted set of objects. There's a test for this case already in t6102, but unfortunately it has a slight error. It creates a broken commit with a parent line pointing to a blob, and then checks that rev-list notices the problem in two cases: 1. the "lone" case: we traverse the broken commit by itself (here we try to actually load the blob from disk and find out that it's not a commit) 2. the "seen" case: we parse the blob earlier in the process, and then when calling lookup_commit() we realize immediately that it's not a commit The "seen" variant for this test mistakenly parsed another commit instead of the blob, meaning that we were actually just testing the "lone" case again. Changing that reveals the breakage (and shows that this fixes it). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
128 lines
4 KiB
Bash
Executable file
128 lines
4 KiB
Bash
Executable file
#!/bin/sh
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test_description='git rev-list should handle unexpected object types'
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. ./test-lib.sh
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test_expect_success 'setup well-formed objects' '
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blob="$(printf "foo" | git hash-object -w --stdin)" &&
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tree="$(printf "100644 blob $blob\tfoo" | git mktree)" &&
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commit="$(git commit-tree $tree -m "first commit")" &&
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git cat-file commit $commit >good-commit
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'
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test_expect_success 'setup unexpected non-blob entry' '
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printf "100644 foo\0$(echo $tree | hex2oct)" >broken-tree &&
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broken_tree="$(git hash-object -w --literally -t tree broken-tree)"
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'
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test_expect_failure 'traverse unexpected non-blob entry (lone)' '
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test_must_fail git rev-list --objects $broken_tree
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'
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test_expect_success 'traverse unexpected non-blob entry (seen)' '
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test_must_fail git rev-list --objects $tree $broken_tree >output 2>&1 &&
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test_i18ngrep "is not a blob" output
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'
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test_expect_success 'setup unexpected non-tree entry' '
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printf "40000 foo\0$(echo $blob | hex2oct)" >broken-tree &&
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broken_tree="$(git hash-object -w --literally -t tree broken-tree)"
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'
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test_expect_success 'traverse unexpected non-tree entry (lone)' '
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test_must_fail git rev-list --objects $broken_tree
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'
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test_expect_success 'traverse unexpected non-tree entry (seen)' '
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test_must_fail git rev-list --objects $blob $broken_tree >output 2>&1 &&
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test_i18ngrep "is not a tree" output
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'
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test_expect_success 'setup unexpected non-commit parent' '
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sed "/^author/ { h; s/.*/parent $blob/; G; }" <good-commit \
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>broken-commit &&
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broken_commit="$(git hash-object -w --literally -t commit \
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broken-commit)"
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'
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test_expect_success 'traverse unexpected non-commit parent (lone)' '
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test_must_fail git rev-list --objects $broken_commit >output 2>&1 &&
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test_i18ngrep "not a commit" output
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'
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test_expect_success 'traverse unexpected non-commit parent (seen)' '
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test_must_fail git rev-list --objects $blob $broken_commit \
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>output 2>&1 &&
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test_i18ngrep "not a commit" output
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'
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test_expect_success 'setup unexpected non-tree root' '
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sed -e "s/$tree/$blob/" <good-commit >broken-commit &&
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broken_commit="$(git hash-object -w --literally -t commit \
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broken-commit)"
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'
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test_expect_success 'traverse unexpected non-tree root (lone)' '
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test_must_fail git rev-list --objects $broken_commit
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'
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test_expect_success 'traverse unexpected non-tree root (seen)' '
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test_must_fail git rev-list --objects $blob $broken_commit \
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>output 2>&1 &&
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test_i18ngrep "not a tree" output
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'
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test_expect_success 'setup unexpected non-commit tag' '
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git tag -a -m "tagged commit" tag $commit &&
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git cat-file tag tag >good-tag &&
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test_when_finished "git tag -d tag" &&
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sed -e "s/$commit/$blob/" <good-tag >broken-tag &&
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tag=$(git hash-object -w --literally -t tag broken-tag)
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'
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test_expect_success 'traverse unexpected non-commit tag (lone)' '
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test_must_fail git rev-list --objects $tag
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'
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test_expect_success 'traverse unexpected non-commit tag (seen)' '
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test_must_fail git rev-list --objects $blob $tag >output 2>&1 &&
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test_i18ngrep "not a commit" output
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'
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test_expect_success 'setup unexpected non-tree tag' '
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git tag -a -m "tagged tree" tag $tree &&
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git cat-file tag tag >good-tag &&
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test_when_finished "git tag -d tag" &&
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sed -e "s/$tree/$blob/" <good-tag >broken-tag &&
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tag=$(git hash-object -w --literally -t tag broken-tag)
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'
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test_expect_success 'traverse unexpected non-tree tag (lone)' '
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test_must_fail git rev-list --objects $tag
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'
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test_expect_success 'traverse unexpected non-tree tag (seen)' '
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test_must_fail git rev-list --objects $blob $tag >output 2>&1 &&
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test_i18ngrep "not a tree" output
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'
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test_expect_success 'setup unexpected non-blob tag' '
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git tag -a -m "tagged blob" tag $blob &&
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git cat-file tag tag >good-tag &&
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test_when_finished "git tag -d tag" &&
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sed -e "s/$blob/$commit/" <good-tag >broken-tag &&
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tag=$(git hash-object -w --literally -t tag broken-tag)
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'
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test_expect_failure 'traverse unexpected non-blob tag (lone)' '
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test_must_fail git rev-list --objects $tag
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'
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test_expect_success 'traverse unexpected non-blob tag (seen)' '
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test_must_fail git rev-list --objects $commit $tag >output 2>&1 &&
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test_i18ngrep "not a blob" output
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'
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test_done
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