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Show First 20 Lines • Show All 215 Lines • ▼ Show 20 Lines	def prepare(self, args, *kwargs) -> None:
assert self.origin is not None		assert self.origin is not None

prev_snapshot: Optional[Snapshot] = None		prev_snapshot: Optional[Snapshot] = None

if not self.ignore_history:		if not self.ignore_history:
prev_snapshot = self.get_full_snapshot(self.origin.url)		prev_snapshot = self.get_full_snapshot(self.origin.url)

if self.base_url and prev_snapshot is None:		if self.base_url and prev_snapshot is None:
base_origin = self.storage.origin_get([self.base_url])[0]		base_origin = list(self.storage.origin_get([self.base_url]))[0]
if base_origin:		if base_origin:
prev_snapshot = self.get_full_snapshot(base_origin.url)		prev_snapshot = self.get_full_snapshot(base_origin.url)

if prev_snapshot is not None:		if prev_snapshot is not None:
self.base_snapshot = prev_snapshot		self.base_snapshot = prev_snapshot
else:		else:
self.base_snapshot = Snapshot(branches={})		self.base_snapshot = Snapshot(branches={})

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