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Switch the repo at ``dest`` to point to ``URL``.
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Prepare a location to receive a checkout/clone.
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Clean up current location and download the url repository
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Return a string representing the requirement needed to
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Return the url used at location
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N)rG )r r- r r r rS ) s zVersionControl.get_urlc C s t �dS )z_
Return the current revision of the files at location
Used in get_info
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Run a VCS subcommand
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Check if a location is controlled by the vcs.
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