bug#61050: mv: add support for --one-file-system

[Paul Eggert]

On 2023-01-25 05:34, Mike Frysinger wrote:
> should there be a `--copy` flag to be able to undo `--no-copy` ?

We can add one if there's a need, but mv doesn't have a --clobber option 
to match its --no-clobber and I'm hoping --no-copy is similar.

> personally i always argue against using negative variable names

Yes, I considered calling it "rename_only" instead of "no_copy", but the 
pull of the --no-copy option's name was too strong. Besides, 
"rename_only" wasn't quite right either as "mv --no-copy" does more than 
just renaming (e.g., if the destination is not writeable).

If we can come up with a better name now's a good time to switch. In the 
meantime I installed the attached coreutils patch.

0001-mv-new-option-no-copy.patch
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