Function runtime_target 

pub fn runtime_target(
    action: &str,
    name: &str,
    rest: &[String],
) -> Result<(RuntimeId, Vec<String>), String>

The runtime a superfluid runtime <action> acts on, and the arguments after it. superfluid runtimes lists an install other than the default as <id>@<install>: remove, repair and use read that as <id> <install>, and the actions that take only an id say how to ask for what was meant.