nixpkgs/pkgs/development/interpreters/python/setup-hook.nix at 96d15eaddb17e0bb9097a04cfe9d1afbe46a1de5 - mirrors/nixpkgs - Alioth Systems Laboratories

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Frederik Rietdijk acd32a4caf Python: set DETERMINISTIC_BUILD and PYTHONHASHSEED in setupHook

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 https://github.com/NixOS/nixpkgs/issues/25707.

2017-05-19 16:28:11 +02:00

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 { runCommand }:
 sitePackages:
 let
   hook = ./setup-hook.sh;
 in runCommand "python-setup-hook.sh" {
   inherit sitePackages;
 } ''
   cp ${hook} hook.sh
   substituteAllInPlace hook.sh
   mv hook.sh $out
 ''