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from bzrlib.transport import get_transport
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def create_mirror(source_branch, target_location, possible_transports):
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possible_transports.append(source_branch.bzrdir.root_transport)
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t = get_transport(target_location, possible_transports)
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mirror = source_branch.bzrdir.clone_on_transport(t).open_branch()
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mirror.set_public_branch(source_branch.base)
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mirror.set_parent(source_branch.base)
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if source_branch.get_config().has_explicit_nickname():
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mirror.nick = source_branch.nick
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mirror.set_submit_branch(source_branch.get_submit_branch())
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source_config = source_branch.get_config()
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child_submit_to = source_config.get_user_option('child_submit_to')
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if child_submit_to is not None:
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mirror.get_config().set_user_option('child_submit_to', child_submit_to)