Thu, 07 Dec 2017 13:20:47 -0800 Phil Cohen overlayworkingctx: add `_checkexist(path)`
Thu, 07 Dec 2017 13:20:47 -0800 Phil Cohen overlayworkingctx: fix a bad reference to `self._path`
Thu, 07 Dec 2017 13:20:47 -0800 Phil Cohen overlayworkingctx: track copy information in the context
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