File: commands_that_need_files.mdwn

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I want to run "virsh update-device guest-name snippet.xml", for the moment from Cmd.cmdProperty. snippet.xml should contain the actual configuration information.  I'm wondering what the best approach is.

1. create a persistent copy of this file using File.hasContent or similar
2. generate a temporary file when running the property.
3. Use a file from the propellor repo

(1) is slightly gross because the persistent copy is used only when running propellor.
(2) I don't really know how to do in propellor; I guess it has to do with monads.
(3) I don't know if this will work or is frowned upon for some reason.