1 files changed, 26 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/interpreters/python/setup-hook.sh b/nixpkgs/pkgs/development/interpreters/python/setup-hook.sh
new file mode 100644
index 000000000000..523df5762fad
--- /dev/null
+++ b/nixpkgs/pkgs/development/interpreters/python/setup-hook.sh
@@ -0,0 +1,26 @@
+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 $result
+}
+
+if [ -z "${dontAddPythonPath:-}" ]; then
+    addEnvHooks "$hostOffset" addPythonPath
+fi
+
+# 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;