[Nix-dev] [PATCH] Allow roots to refer to arbitrary files in the store

[Vladimír Čunát]

On 04/14/2014 04:59 PM, Ludovic Courtès wrote:
> It also guarantees that this thing lives on the same file system as the
> store, which means that rename(2) can be used to move it to its final
> location in the store.

I don't think we should *force* nix to have temporary files on the same 
FS as store. For some use cases it's better e.g. to have TMP in RAM, etc.

As for moving to final destination, I would go for a compromise of "cp 
--reflink=auto", as it will transparently be fast if on the same FS (and 
it supports reflinks, which is unfortunately quite a strict requirement).


Vlada


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