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use trap to clean up fsroot reliably
Signed-off-by: Guohan Lu lguohan@gmail.com
- Why I did it
cleanup fsroot reliably
- How I did it
use trap to clean up fsroot reliably
- How to verify it
- Which release branch to backport (provide reason below if selected)
- Description for the changelog
- A picture of a cute animal (not mandatory but encouraged)