Even if deprecated, the parameter *must* be supported, which isn't the case right now. This was due to a misunderstanding of how deprecating parameters work, see: https://www.cdi.st/manual/latest/cdist-type.html#deprecated-parameters
…and to make it work, replace --file with --line. --file is deprecated because it does not work with the state explorer as the contents of the file are not available on the target.
Signed-off-by: Nico Schottelius <nico@brief.schottelius.org>