Cole Robinson a242894182 cli: Add --os-variant require=on|off
If specified, this errors if no OS name was detected or manually set.
So --os-variant detect=on,require=on will error if no OS is detected.

name= can be used as a fallback, so test and document this case

Signed-off-by: Cole Robinson <crobinso@redhat.com>
2020-09-14 20:36:12 -04:00
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