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Return the name of the version control backend if found at given
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posix absolute paths start with os.path.sep,
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Returns the correct repository URL and revision by parsing the given
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Compare two repo URLs for identity, ignoring incidental differences.
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Takes the contents of the bundled text file that explains how to revert
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Called when installing or updating an editable package, takes the
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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.
Return True if the location is ready for (and requires) a
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