File 0001-allow-for-reproducible-builds-of-python-pa... of Package python3-doc

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File 0001-allow-for-reproducible-builds-of-python-packages.patch of Package python3-doc

From 0d6dde67a01878b0d708b4216e2b31f1c76544fb Mon Sep 17 00:00:00 2001
From: "Bernhard M. Wiedemann" <bwiedemann@suse.de>
Date: Sat, 25 Feb 2017 06:42:28 +0100
Subject: [PATCH] allow for reproducible builds of python packages

See https://reproducible-builds.org/ for why this is good
and https://reproducible-builds.org/specs/source-date-epoch/
for the definition of this variable.

Background:
In some distributions like openSUSE, binary rpms contain precompiled .pyc files.

And packages like amqp or twisted dynamically generate .py files at build time
so those have the current time and that timestamp gets embedded
into the .pyc file header.
When we then adapt file timestamps in rpms to be constant,
the timestamp in the .pyc header will no more match
the .py timestamp in the filesystem.
The software will still work, but it will not use the .pyc file as it should.
---
 Lib/py_compile.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Lib/py_compile.py b/Lib/py_compile.py
index 11c5b50..62dcdc7 100644
--- a/Lib/py_compile.py
+++ b/Lib/py_compile.py
@@ -137,6 +137,10 @@ def compile(file, cfile=None, dfile=None, doraise=False, optimize=-1):
     except FileExistsError:
         pass
     source_stats = loader.path_stats(file)
+    sde = os.environ.get('SOURCE_DATE_EPOCH')
+    if sde and source_stats['mtime'] > int(sde):
+        source_stats['mtime'] = int(sde)
+        os.utime(file, (source_stats['mtime'], source_stats['mtime']))
     bytecode = importlib._bootstrap_external._code_to_bytecode(
             code, source_stats['mtime'], source_stats['size'])
     mode = importlib._bootstrap_external._calc_mode(file)
-- 
2.10.2

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