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Query SELinux policy roles.
Parameter:
policy The policy to query.
Keyword Parameters/Class attributes:
name The role name to match.
name_regex If true, regular expression matching
will be used on the role names.
types The type to match.
types_equal If true, only roles with type sets
that are equal to the criteria will
match. Otherwise, any intersection
will match.
types_regex If true, regular expression matching
will be used on the type names instead
of set logic.
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