On 3/4/24 16:43, Dominique Martinet wrote:
Adding Rob to the loop because this impacts compatibility with
toybox/maybe busybox implementations

Busybox does not use RENAME_EXCHANGE, so this isn't a Busybox issue.

Toybox mv added -x to its development version yesterday:

https://github.com/landley/toybox/commit/a2419ad52d489bf1a84a9f3aa73afb351642c765

so there's little prior art there, and there's still plenty of time to fix its problems before exposing it to the world.


I also see --swap mostly used by scripts and this actually feels a bit
dangerous to me -- I'd *always* use this with -T.

Yes, it's a problem.

By "see --swap mostly used by scripts" I assume you mean scripts that haven't been written yet, assuming that nobody had -x until yesterday....


(by the way, what's this "rename" command you speak of?

https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/

Now that I've looked into it further, util-linux already has an "exch" command that does exactly what you want. This is the command that toybox should implement rather than try to simulate it with "mv -x" (which causes all sorts of problems).

That is, toybox should revert yesterday's change to "mv", and should implement "exch" instead.



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