6c045a9998
This replaces --private-user-chown by an enum value --private-user-ownership=off|chown. Changes otherwise very little. This is mostly preparation for a follow-up commit adding a new "map" mode, using kernel 5.12 UID mapping mounts. Note that this does alter codeflow a bit: the new enum already knows three different values instead of the old true/false pair. Besides "off" and "chown" it knows -EINVAL, i.e. whenever the value wsn't set explicitly. This value is changed to "off" or "chown" before use, thus retaining compat to the status quo before, except it won't override explicit configuration anymore. Thus, if you explicitly request --private-user=pick you can now combine it wiht an explicit --private-user-ownership=off if you like, which will give you a container that runs under its own UID set, but the files will be owned by the original image. Makes not much sense besids maybe debugging, but if requested explicitly I think it's OK to implement.
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