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bzrlib/upgrade.py
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    def __init__(self, url, format=None):
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        self.format = format
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        self.bzrdir = BzrDir.open_unsupported(url)
 
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        # XXX: Change to cleanup
 
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        warning_id = 'cross_format_fetch'
 
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        saved_warning = warning_id in ui.ui_factory.suppressed_warnings
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        if isinstance(self.bzrdir, RemoteBzrDir):
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            self.bzrdir._ensure_real()
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            self.bzrdir = self.bzrdir._real_bzrdir
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        if self.bzrdir.root_transport.is_readonly():
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            raise errors.UpgradeReadonly
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        self.transport = self.bzrdir.root_transport
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        self.convert()
 
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        ui.ui_factory.suppressed_warnings.add(warning_id)
 
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        try:
 
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            self.convert()
 
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        finally:
 
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            if not saved_warning:
 
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                ui.ui_factory.suppressed_warnings.remove(warning_id)
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    def convert(self):
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        try: