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    @cvar queue_name: The queue we pick tasks from.
    @cvar lsb_release_filename: The path to the LSB data on the file system.
    @cvar landscape_ppa_url: The URL of the Landscape PPA, if it is present
        in the computer's sources.list it won't be commented out.
    @cvar logs_directory: Path to the directory holding the upgrade-tool logs.
    @cvar logs_limit: When reporting upgrade-tool logs to the server, only the
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				"cCstjj|jjs.tj|jjnt||g|jjdtj}d}d}|j	||j
||S(sFetch the upgrade-tool files.

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cCs?t||}d}d}|j||j||S(sVerify the upgrade-tool tarball against its signature.

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cCsLtj|d}x-|jD]}|j|d|jjqWtdS(svExtract the upgrade-tool tarball.

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