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Python: set DETERMINISTIC_BUILD and PYTHONHASHSEED in setupHook #25916

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merged 1 commit into from
May 22, 2017

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FRidh
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@FRidh FRidh commented May 19, 2017

The Python interpreters are patched so they can build .pyc bytecode free of certain indeterminism.

When building Python packages we currently set

DETERMINISTIC_BUILD=1;
PYTHONHASHSEED = 0;

Instead of setting these environment variables in the function that
builds the package, this commit sets the variables in the Python
setup hook. That way, whenever Python is included in a derivation, these
variables are set.

See also the issue #25707.

Motivation for this change
Things done
  • Tested using sandboxing
    (nix.useSandbox on NixOS,
    or option build-use-sandbox in nix.conf
    on non-NixOS)
  • Built on platform(s)
    • NixOS
    • macOS
    • Linux
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Fits CONTRIBUTING.md.

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@FRidh, thanks for your PR! By analyzing the history of the files in this pull request, we identified @peti, @vcunat, @domenkozar and @FRidh to be potential reviewers.

The Python interpreters are patched so they can build .pyc bytecode free
of certain indeterminism.

When building Python packages we currently set

```
compiling python files.
in nix store.
DETERMINISTIC_BUILD=1;
PYTHONHASHSEED = 0;
```

Instead if setting these environment variables in the function that
builds the package, this commit sets the variables instead in the Python
setup hook. That way, whenever Python is included in a derivation, these
variables are set.

See also the issue NixOS#25707.
@vcunat
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vcunat commented May 24, 2017

Evaluation trivially fixed up in b7fed33.

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3 participants