Re: command for swapping of two files or two dirs?

[Eli Schwartz]

On 3/26/21 5:21 PM, Peng Yu wrote:
> The problem is that the swap based on multiple commands is not atomic.
> 
> With multiple commands, wouldn't it cause complications for error
> recovery? Also, is it safe? If there is any malicious program delete
> some files during the process?


If you feel the need for "atomic" swapping, then rename/renameat being
run three times very fast in a single command written in C, will still
not be atomic -- merely fast.

You're going to need to figure out how to implement this at the
filesystem or kernel level, not as a "well-maintained command".

Or, you may give up on formally guaranteed atomicity, and use 'mv' three
times fast.

-- 
Eli Schwartz
Arch Linux Bug Wrangler and Trusted User

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