nixpkgs/pkgs/development/interpreters/python/setup-hook.nix at 53d2838f27ce504e154dfbd079c259c4c372daab - alioth/nixpkgs - Alioth Systems Laboratories

alioth/nixpkgs

forked from mirrors/nixpkgs

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
 ''