Re: Making package builds deterministic

[Ricardo Wurmus <ricardo.wurmus@mdc-berlin.de>]

Hi Matthew,

> After running the following commands I got some output at the end
> indicating non-determinisim.
>
> ================================================================================
>
> $ export GUIX_BUILD_OPTIONS="--keep-failed --verbosity=3"
> $ ./pre-inst-env guix build --rounds=2 go@1.4 &>/dev/stdout &>${BUILD_LOG}
>
> ...
> result of ‘/gnu/store/y89n1idbjpq0hhqjpg82mw6bd1llnl21-go-1.4.3.drv’
> differs from previous round; rejecting as non-deterministic
> @ build-failed /gnu/store/y89n1idbjpq0hhqjpg82mw6bd1llnl21-go-1.4.3.drv
> - 1 result of ‘/gnu/store/y89n1idbjpq0hhqjpg82mw6bd1llnl21-go-1.4.3.drv’
> differs from previous round; rejecting as non-deterministic
> note: keeping build directory `/tmp/guix-build-go-1.4.3.drv-0'
> guix build: error: build failed: build of
> `/gnu/store/y89n1idbjpq0hhqjpg82mw6bd1llnl21-go-1.4.3.drv' failed
>
> ================================================================================
>
> What I would like to know, is there a way to have two build/output directories
> to compare (maybe with diff or some other tool). Basically I'm just
> trying to identify the files causing the non-determinisim.

Since 7f3b2510d6b050b8fb0974fa0cd7a164ac51f6d1 the daemon should keep
the rebuilt output when “--check” and “-K” is given.  Are you using the
latest version of the daemon?

~~ Ricardo