Re: Derivations differ between computers?

[zimoun]

Hi,

On Wed, 24 Nov 2021 at 20:55, Leo Famulari <leo@famulari.name> wrote:
> I'm seeing something weird, where Guix is creating different derivations
> based on the same Git commit, between two machines of the same system
> type:

Euh?!

Many things appear really weird.  Just, how is it possible,

> Derive([("out","/gnu/store/81bdcd5x4v50i28h98bfkvvkx9cky63w-hello-2.10","","")]
("/gnu/store/xmq151lsv0p5q435q8l3f9yi8ddrxs00-hello-2.10.tar.gz.drv",["out"])

> Derive([("out","/gnu/store/81bdcd5x4v50i28h98bfkvvkx9cky63w-hello-2.10","","")]
("/gnu/store/78ww8sqfpxavnkjgwafs7xr2zwzza3mc-hello-2.10.tar.gz.drv",["out"])


to have 2 different fixed-outputs which lead to the same final output hash?


On my machine, running two time-machine, I get the same as machine A
/gnu/store/260bk0ch4np4h2yz5yqhf8hjbsyhwpmr-hello-2.10.drv.


Where does Guix on machine B come from?  Because, Guix inherits from
some previous config, I mean, for instance:

   ./bootstrap && ./configure --localstatedir=/var && make
   ./pre-inst-env guix pull
   guix pull
   guix <actions>

is not necessarily the same as:

   guix pull
   guix pull
   guix <actions>

because ’sysconfdir’ is not the same.  See for instance this
<http://issues.guix.gnu.org/issue/47401> for documenting this behaviour.


Cheers,
simon