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gpg_strategy = gpg.GPGStrategy(None)
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result = repo.verify_revision_signature(rev_id, gpg_strategy)
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if result[0] == gpg.SIGNATURE_VALID:
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if result[0] == gpg.SIGNATURE_KEY_MISSING:
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return "unknown key {0}".format(result[1])
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if result[0] == gpg.SIGNATURE_NOT_VALID: