python2.7: improve reproducibility

The compiled .pyc files contain time stamp corresponding to the compile time.
This prevents binary reproducibility. This patch allows to achieve binary
reproducibility by overriding the build time stamp by the value
exported via SOURCE_DATE_EPOCH.

Patch by Bernhard M. Wiedemann, backported from https://github.com/python/cpython/pull/296

[YOCTO#11241]

(From OE-Core rev: 2a044f1e4f5c63e11e631b31f741c7aabfa6f601)

Signed-off-by: Juro Bystricky <juro.bystricky@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 35 insertions, 0 deletions

diff --git a/meta/recipes-devtools/python/python/support_SOURCE_DATE_EPOCH_in_py_compile_2.7.patch b/meta/recipes-devtools/python/python/support_SOURCE_DATE_EPOCH_in_py_compile_2.7.patch
new file mode 100644
index 0000000000..12651798ee
--- /dev/null
+++ b/meta/recipes-devtools/python/python/support_SOURCE_DATE_EPOCH_in_py_compile_2.7.patch
@@ -0,0 +1,34 @@
+The compiled .pyc files contain time stamp corresponding to the compile time.
+This prevents binary reproducibility. This patch allows to achieve binary
+reproducibility by overriding the build time stamp by the value 
+exported via SOURCE_DATE_EPOCH. 
+
+Patch by Bernhard M. Wiedemann
+
+Upstream-Status: Backport
+
+Signed-off-by: Juro Bystricky <juro.bystricky@intel.com>
+
+Fri Feb 24 17:08:25 UTC 2017 - bwiedemann@suse.com
+
+- Add reproducible.patch to allow reproducible builds of various
+  python packages like python-amqp
+  Upstream: https://github.com/python/cpython/pull/296
+
+
+@@ -0,0 +1,15 @@
+Index: Python-2.7.13/Lib/py_compile.py
+===================================================================
+--- Python-2.7.13.orig/Lib/py_compile.py
++++ Python-2.7.13/Lib/py_compile.py
+@@ -108,6 +108,10 @@ def compile(file, cfile=None, dfile=None
+             timestamp = long(os.fstat(f.fileno()).st_mtime)
+         except AttributeError:
+             timestamp = long(os.stat(file).st_mtime)
++        sde = os.environ.get('SOURCE_DATE_EPOCH')
++        if sde and timestamp > int(sde):
++            timestamp = int(sde)
++            os.utime(file, (timestamp, timestamp))
+         codestring = f.read()
+     try:
+         codeobject = __builtin__.compile(codestring, dfile or file,'exec')
diff --git a/meta/recipes-devtools/python/python_2.7.13.bb b/meta/recipes-devtools/python/python_2.7.13.bb
index 98bc8ada8b..4d73cd25c8 100644
--- a/meta/recipes-devtools/python/python_2.7.13.bb
+++ b/meta/recipes-devtools/python/python_2.7.13.bb
@@ -28,6 +28,7 @@ SRC_URI += "\
   file://add-CROSSPYTHONPATH-for-PYTHON_FOR_BUILD.patch \
   file://Don-t-use-getentropy-on-Linux.patch \
   file://pass-missing-libraries-to-Extension-for-mul.patch \
+  file://support_SOURCE_DATE_EPOCH_in_py_compile_2.7.patch \
 "
 
 S = "${WORKDIR}/Python-${PV}"