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"""
Boot variables backend support for pybootmgmt
"""
import sys
"""Returns an instance of bootinfo.BootVariables corresponding to the
architecture and system root passed in."""
if arch is None:
if osname is None:
raise BootmgmtArgumentError('osname cannot be None')
# bootvars_backend returns the *class*
return bootvar_backend_class(sysroot)
else:
return None