diff options
| author | Frederik Rietdijk <fridh@fridh.nl> | 2017-02-22 15:55:58 +0100 |
|---|---|---|
| committer | Frederik Rietdijk <fridh@fridh.nl> | 2017-02-26 14:51:26 +0100 |
| commit | 37704e90e29893121837b662eb0a34af2b8acf48 (patch) | |
| tree | 5b20c7df300094bdaed4ede3b135f2eafb039f27 /doc | |
| parent | 04b7a2791e50614fb36eb3dfc0c080c3617c9178 (diff) | |
| download | nixpkgs-37704e90e29893121837b662eb0a34af2b8acf48.tar nixpkgs-37704e90e29893121837b662eb0a34af2b8acf48.tar.gz nixpkgs-37704e90e29893121837b662eb0a34af2b8acf48.tar.bz2 nixpkgs-37704e90e29893121837b662eb0a34af2b8acf48.tar.lz nixpkgs-37704e90e29893121837b662eb0a34af2b8acf48.tar.xz nixpkgs-37704e90e29893121837b662eb0a34af2b8acf48.tar.zst nixpkgs-37704e90e29893121837b662eb0a34af2b8acf48.zip | |
Python: explain deterministic build in docs
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/languages-frameworks/python.md | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/doc/languages-frameworks/python.md b/doc/languages-frameworks/python.md index 19f241fb185..0c7e521b11e 100644 --- a/doc/languages-frameworks/python.md +++ b/doc/languages-frameworks/python.md @@ -641,6 +641,19 @@ community to help save time. No tool is preferred at the moment. - [pypi2nix](https://github.com/garbas/pypi2nix) by Rok Garbas - [pypi2nix](https://github.com/offlinehacker/pypi2nix) by Jaka Hudoklin +### Deterministic builds + +Python 2.7, 3.5 and 3.6 are now built deterministically and 3.4 mostly. +Minor modifications had to be made to the interpreters in order to generate +deterministic bytecode. This has security implications and is relevant for +those using Python in a `nix-shell`. + +When the environment variable `DETERMINISTIC_BUILD` is set, all bytecode will have timestamp 1. +The `buildPythonPackage` function sets `DETERMINISTIC_BUILD` as well as +[PYTHONHASHSEED](https://docs.python.org/3.5/using/cmdline.html#envvar-PYTHONHASHSEED). +Both are also exported in `nix-shell`. + + ## FAQ ### How can I install a working Python environment? |