bug#14383: cp --one-file-system / will not copy whole root filesystem

[Pavel Machek]

Hi!

On systems like linux, cp / -a --one-file-system (destination) will
not copy whole root filesystem. It is not cp's fault, but the
behaviour is quite surprising to the users, so maybe it would be worth
warning in man page?

Something like

       -x, --one-file-system
              stay on this file system

              Note that on systems that allow mounts over non-empty
              directories (like Linux), cp / -ax (destination) will
              not copy whole filesystem. In particular, content of
              /dev will not be usually copied, because distributions
              mount tmpfs over /dev.

[Ok, there's hopefully better wording...?]
                                                                        Pavel

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