Pat Gavlin a0f04b7069 Refactor the backend package. ... The primary goal of this refactoring is to simplify the interface that a Pulumi backend must implement in order to provide better clarity and separation of concerns. The new interface is centered around the set of operations necessary for persistence rather than the set of behaviors required of a stack (e.g. statefile storage vs. running an update or preview). The former functionality is captured by a new interface, `backend.Client`, and the latter is captured in the concrete type `cli.Backend.` Implementers of `backend.Client` should not perform console I/O--that is the purview of `cli.Backend`. These changes lay the groundwork for concurrency control, project/org support, etc. in the filestate backend.		2020-12-08 11:39:47 -08:00
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pulumi	Refactor the backend package.	2020-12-08 11:39:47 -08:00