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self.bzrdir.check_conversion_target(self.format)
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self.pb.note('starting upgrade of %s', self.transport.base)
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while self.bzrdir.needs_format_conversion(self.format):
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converter = self.bzrdir._format.get_converter(self.format)
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self.bzrdir = converter.convert(self.bzrdir, self.pb)
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def upgrade(url, format=None):
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"""Upgrade to format, or the default bzrdir format if not supplied."""