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Ⅰ. Describe what this PR did
fixed calling Untar with non-root path, and use Untar with root.
Ⅱ. Does this pull request fix one issue?
Ⅲ. Why don't you add test cases (unit test/integration test)? (你真的觉得不需要加测试吗?)
Ⅳ. Describe how to verify it
Ⅴ. Special notes for reviews