[Nix-dev] can't share a store between i686-linux and i686-darwin (was: Nix 0.13pre17232 doesn't work on i386-apple-darwin9.7.0)

[Lluís Batlle]

I don't think you can use a /nix/store without its /nix/var/nix files
(the db). When you say 'rsync the store' I guess you don't include the
/nix/var/nix, which may not be rsync-able.

Maybe the experts can throw some light, because I don't have any proof
for the behaviour I assume. I imagine that the validity of store paths
is kept in /nix/var/nix, not in the /nix/store.

Regards,
Lluís.

2009/10/7 Peter Simons <simons at cryp.to>:
> Hi Eelco,
>
>  > Why did you have this impression? If there was an error, can you
>  > reproduce it?
>
>  1) Compile Nix on i686-linux with --disable-old-db-compat, then bootstrap the
>    store with "./nix-env -i nix".
>
>  2) Rsync that store to i686-darwin.
>
>  3) Build nix on Darwin with --disable-init-state --disable-old-db-compat. Use
>    those binaries to run "./nix-env -i nix". Throw in a "nix-store --verify"
>    for good measure.
>
>  4) Rsync that store back to i686-linux.
>
> Now, "nix-env -i" on Linux no longer works. Packages can be built, but nix-env
> fails to generate the new user environment, claiming that some arbitrary file
> in the newly installed package would collide with a file of the same name in
> the nix package.
>
> I have not experienced that problem when sharing a store between i686-linux and
> x86_64-linux. Also, it seems as if I can also share x86_64-linux with
> i686-darwin.
>
> Is there something in store that depends only on the CPU, but not on the OS,
> maybe?
>
> It is possible that I screwed up the store by mistake, i.e. while rsync'ing the
> directories between machines, etc., but it feels unlikely to me, because I've
> had that problem with Darwin for the second time. My first attempt to do that
> caused my earlier postings to this list; this is the second time that I've
> tried to put MacOS binaries into the same store with Linux.
>
> Does anyone have a clue what might be the cause of this?
>
> Take care,
> Peter
>
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