[OE-core] [warrior 16/25] python3: Reformat sysconfig

[Armin Kuster]

From: Joshua Watt <jpewhacker at gmail.com>

Reformats the sysconfig file when packaging. This file is output by
using the python pprint function. This function will wrap long lines at
80 characters by default, and will even split strings at whitespace
boundaries to do so, e.g.:

 'A': 'B is really'
    ' long'

This causes a problem for reproducibility however because there might be
lines of differing lengths depending on the build path. These
non-reproducible paths are removed, but their effect on string wrapping
from pprint remains.

To correct this, reformat the entire sysconfig file by re-printing using
pprint with an (effectively) unlimited line length.

Signed-off-by: Joshua Watt <JPEWhacker at gmail.com>
Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808 at gmail.com>
---
 .../python/python3/reformat_sysconfig.py            | 21 +++++++++++++++++++++
 meta/recipes-devtools/python/python3_3.7.4.bb       |  7 +++++++
 2 files changed, 28 insertions(+)
 create mode 100644 meta/recipes-devtools/python/python3/reformat_sysconfig.py

diff --git a/meta/recipes-devtools/python/python3/reformat_sysconfig.py b/meta/recipes-devtools/python/python3/reformat_sysconfig.py
new file mode 100644
index 0000000..c416431
--- /dev/null
+++ b/meta/recipes-devtools/python/python3/reformat_sysconfig.py
@@ -0,0 +1,21 @@
+#! /usr/bin/env python3
+#
+# SPDX-License-Identifier: MIT
+#
+# Copyright 2019 by Garmin Ltd. or its subsidiaries
+#
+# A script to reformat python sysconfig
+
+import sys
+import pprint
+l = {}
+g = {}
+with open(sys.argv[1], 'r') as f:
+    exec(f.read(), g, l)
+
+with open(sys.argv[1], 'w') as f:
+    for k in sorted(l.keys()):
+        f.write('%s = ' % k)
+        pprint.pprint(l[k], stream=f, width=sys.maxsize)
+        f.write('\n')
+
diff --git a/meta/recipes-devtools/python/python3_3.7.4.bb b/meta/recipes-devtools/python/python3_3.7.4.bb
index c5a5db1..e9ec604 100644
--- a/meta/recipes-devtools/python/python3_3.7.4.bb
+++ b/meta/recipes-devtools/python/python3_3.7.4.bb
@@ -25,6 +25,7 @@ SRC_URI = "http://www.python.org/ftp/python/${PV}/Python-${PV}.tar.xz \
            file://0001-Makefile-fix-Issue36464-parallel-build-race-problem.patch \
 	   file://0001-bpo-36852-proper-detection-of-mips-architecture-for-.patch \
 	   file://crosspythonpath.patch \
+           file://reformat_sysconfig.py \
            "
 
 SRC_URI_append_class-native = " \
@@ -157,6 +158,12 @@ py_package_preprocess () {
                 ${PKGD}/${libdir}/python${PYTHON_MAJMIN}/_sysconfigdata*.py \
                 ${PKGD}/${bindir}/python${PYTHON_BINABI}-config
 
+        # Reformat _sysconfigdata after modifying it so that it remains
+        # reproducible
+        for c in ${PKGD}/${libdir}/python${PYTHON_MAJMIN}/_sysconfigdata*.py; do
+            python3 ${WORKDIR}/reformat_sysconfig.py $c
+        done
+
         # Recompile _sysconfigdata after modifying it
         cd ${PKGD}
         sysconfigfile=`find . -name _sysconfigdata_*.py`
-- 
2.7.4