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Export the repository at the url to the destination location
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Switch the repo at ``dest`` to point to ``URL``.
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Update an already-existing repo to the given ``rev_options``.
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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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Return the current revision of the files at location
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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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