nixpkgs/pkgs/development/interpreters/python/setup-hook.sh
Frederik Rietdijk 5920579a3d Python: disable user site-packages in setup hook
Wrappers already included `PYTHONNOUSERSITE=1`, but now this env var is
also set in the Python setup hook. This improves purity in case of
non-sandboxes builds and nix-shell.
2017-12-30 17:09:09 +01:00

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addPythonPath() {
addToSearchPathWithCustomDelimiter : PYTHONPATH $1/@sitePackages@
}
toPythonPath() {
local paths="$1"
local result=
for i in $paths; do
p="$i/@sitePackages@"
result="${result}${result:+:}$p"
done
echo $result
}
envHooks+=(addPythonPath)
# Determinism: The interpreter is patched to write null timestamps when compiling python files.
# This way python doesn't try to update them when we freeze timestamps in nix store.
export DETERMINISTIC_BUILD=1;
# Determinism: We fix the hashes of str, bytes and datetime objects.
export PYTHONHASHSEED=0;
# Determinism. Whenever Python is included, it should not check user site-packages.
# This option is only relevant when the sandbox is disabled.
export PYTHONNOUSERSITE=1;