Subject: bug#22010: Python 2.7.10 not deterministic

From: [email-masked] (Ludovic Courtès)
Date: Wed, 25 Nov 2015 15:38:54 +0100

As of v0.9.0-238-gd7572b4 (currently ‘tk-update’), Python 2.7.10 is not
reproducible:

--8<---------------cut here---------------start------------->8---
$ diff -r --no-dereference /gnu/store/q405y94pbnx028mygranaww5pnbqhnq1-python-2.7.10 ,py
Binary files /gnu/store/q405y94pbnx028mygranaww5pnbqhnq1-python-2.7.10/lib/libpython2.7.so.1.0 and ,py/lib/libpython2.7.so.1.0 differ
diff -r --no-dereference /gnu/store/q405y94pbnx028mygranaww5pnbqhnq1-python-2.7.10/lib/python2.7/config/Makefile ,py/lib/python2.7/config/Makefile
31,32c31,32
< abs_srcdir=	/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10
< abs_builddir=	/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10
---
> abs_srcdir=	/gnu/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10
> abs_builddir=	/gnu/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10
146c146
< RUNSHARED=       LD_LIBRARY_PATH=/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10
---
> RUNSHARED=       LD_LIBRARY_PATH=/gnu/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10
Binary files /gnu/store/q405y94pbnx028mygranaww5pnbqhnq1-python-2.7.10/lib/python2.7/getopt.pyc and ,py/lib/python2.7/getopt.pyc differ
Binary files /gnu/store/q405y94pbnx028mygranaww5pnbqhnq1-python-2.7.10/lib/python2.7/getopt.pyo and ,py/lib/python2.7/getopt.pyo differ
Binary files /gnu/store/q405y94pbnx028mygranaww5pnbqhnq1-python-2.7.10/lib/python2.7/lib2to3/Grammar2.7.10.final.0.pickle and ,py/lib/python2.7/lib2to3/Grammar2.7.10.final.0.pickle differ
Binary files /gnu/store/q405y94pbnx028mygranaww5pnbqhnq1-python-2.7.10/lib/python2.7/lib-dynload/array.so and ,py/lib/python2.7/lib-dynload/array.so differ
Binary files /gnu/store/q405y94pbnx028mygranaww5pnbqhnq1-python-2.7.10/lib/python2.7/lib-dynload/gdbm.so and ,py/lib/python2.7/lib-dynload/gdbm.so differ
Binary files /gnu/store/q405y94pbnx028mygranaww5pnbqhnq1-python-2.7.10/lib/python2.7/lib-dynload/pyexpat.so and ,py/lib/python2.7/lib-dynload/pyexpat.so differ
Binary files /gnu/store/q405y94pbnx028mygranaww5pnbqhnq1-python-2.7.10/lib/python2.7/py_compile.pyc and ,py/lib/python2.7/py_compile.pyc differ
Binary files /gnu/store/q405y94pbnx028mygranaww5pnbqhnq1-python-2.7.10/lib/python2.7/py_compile.pyo and ,py/lib/python2.7/py_compile.pyo differ
Binary files /gnu/store/q405y94pbnx028mygranaww5pnbqhnq1-python-2.7.10/lib/python2.7/struct.pyc and ,py/lib/python2.7/struct.pyc differ
Binary files /gnu/store/q405y94pbnx028mygranaww5pnbqhnq1-python-2.7.10/lib/python2.7/struct.pyo and ,py/lib/python2.7/struct.pyo differ
diff -r --no-dereference /gnu/store/q405y94pbnx028mygranaww5pnbqhnq1-python-2.7.10/lib/python2.7/_sysconfigdata.py ,py/lib/python2.7/_sysconfigdata.py
458c458
<  'RUNSHARED': 'LD_LIBRARY_PATH=/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10',
---
>  'RUNSHARED': 'LD_LIBRARY_PATH=/gnu/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10',
502c502
<  'TESTPYTHON': 'LD_LIBRARY_PATH=/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10 ./python -Wd -3 -E -tt',
---
>  'TESTPYTHON': 'LD_LIBRARY_PATH=/gnu/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10 ./python -Wd -3 -E -tt',
526,527c526,527
<  'abs_builddir': '/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10',
<  'abs_srcdir': '/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10',
---
>  'abs_builddir': '/gnu/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10',
>  'abs_srcdir': '/gnu/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10',
Binary files /gnu/store/q405y94pbnx028mygranaww5pnbqhnq1-python-2.7.10/lib/python2.7/_sysconfigdata.pyc and ,py/lib/python2.7/_sysconfigdata.pyc differ
Binary files /gnu/store/q405y94pbnx028mygranaww5pnbqhnq1-python-2.7.10/lib/python2.7/_sysconfigdata.pyo and ,py/lib/python2.7/_sysconfigdata.pyo differ
--8<---------------cut here---------------end--------------->8---

The pyc/pyo differ by one 32-bit value starting on the 5th byte of the
file.

Ludo’.