Right now the sandbox utility runs "shutil.rmtree()" It would probably make more sense for it to run shred(1) on the files so there's nothing left on the system.
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As best as I can tell, this is still a valid bug. I'll move it to Fedora 15.
I would do this but their is no python bindings to shred, that I know of. Execing and requiring shred seems wrong.
Since this version of Fedora is no longer supported I am closing this bugs. If you are still seeing this bug in a current version of fedora, please reopen the bugzilla with the appropriate version number.