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+#!/bin/sh
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+
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+test_description='git rev-list should handle unexpected object types'
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+
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+. ./test-lib.sh
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+
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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 $commit >good-commit
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+'
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+
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+test_expect_success 'setup unexpected non-blob entry' '
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+ printf "100644 foo\0$(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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+
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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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+
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+test_expect_failure 'traverse unexpected non-blob entry (seen)' '
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+ test_must_fail git rev-list --objects $tree $broken_tree
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+'
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+
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+test_expect_success 'setup unexpected non-tree entry' '
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+ printf "40000 foo\0$(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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+
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+test_expect_failure '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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+
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+test_expect_failure 'traverse unexpected non-tree entry (seen)' '
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+ test_must_fail git rev-list --objects $blob $broken_tree
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+'
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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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+
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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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+
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+test_expect_success 'traverse unexpected non-commit parent (seen)' '
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+ test_must_fail git rev-list --objects $commit $broken_commit \
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+ >output 2>&1 &&
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+ test_i18ngrep "not a commit" output
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+'
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+
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+test_expect_success 'setup unexpected non-tree root' '
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+ sed -e "s/$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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+
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+test_expect_failure '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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+
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+test_expect_failure 'traverse unexpected non-tree root (seen)' '
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+ test_must_fail git rev-list --objects $blob $broken_commit
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+'
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+test_done