Provide metadata only mode for cli

[murphm8]

Sometimes I just want to get the source command for a bundle and I don't want to have to fully extract it. Other times, maybe the bundle is fully extracted and I've deleted it and I only have the cache. In both cases, I should be able to generate a source command.

[xabxx]

any updates? @murphm8 can we put some labels on this issue?