GNU bug report logs - #22010
Python 2.7.10 not deterministic

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Package: guix; Severity: important; Reported by: ludo@HIDDEN (Ludovic Courtès); dated Wed, 25 Nov 2015 14:40:03 UTC; Maintainer for guix is bug-guix@HIDDEN.

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From: Ricardo Wurmus <rekado@HIDDEN>
To: Leo Famulari <leo@HIDDEN>
Subject: Re: bug#22010: bytecode timestamps
References: <871tbef8jl.fsf@HIDDEN> <20160207235839.GA4994@jasmine>
Date: Tue, 05 Feb 2019 13:25:54 +0100
In-Reply-To: <20160207235839.GA4994@jasmine> (Leo Famulari's message of "Sun, 
 7 Feb 2016 18:58:39 -0500")
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Leo Famulari <leo@HIDDEN> writes:

> Those differing bytes are the timestamps of the .py sources files that
> correspond to the compiled .pyc / .pyo files. So, the
> python-2.7-source-date-epoch.patch is working for software compiled by
> the patched compiler, but not on python-2.7 itself.
>
> It's related to <http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D22533>.

It looks easy to fix this:

--8<---------------cut here---------------start------------->8---
diff --git a/gnu/packages/python.scm b/gnu/packages/python.scm
index 1c4ea720f..34c01bd50 100644
--- a/gnu/packages/python.scm
+++ b/gnu/packages/python.scm
@@ -276,6 +276,38 @@ data types.")
                         (search-patches "python2-CVE-2018-14647.patch"
                                         "python2-CVE-2018-1000802.patch"))=
)))))
=20
+(define-public python-2-rekado
+  (package
+    (inherit python-2)
+    (name "python2-rekado")
+    (arguments
+     `(#:tests? #f ; XXX
+       ,@(substitute-keyword-arguments (package-arguments python-2)
+           ((#:phases phases)
+            `(modify-phases ,phases
+               (add-after 'remove-tests 'rebuild-bytecode
+                 (lambda* (#:key outputs #:allow-other-keys)
+                   (let ((out (assoc-ref outputs "out")))
+                     ;; Disable hash randomization to ensure the generated=
 .pycs
+                     ;; are reproducible.
+                     (setenv "PYTHONHASHSEED" "0")
+                     (for-each
+                      (lambda (opt)
+                        (format #t "Compiling with optimization level: ~a\=
n"
+                                (if (null? opt) "none" (car opt)))
+                        (for-each (lambda (file)
+                                    (apply invoke
+                                           `(,(string-append out "/bin/pyt=
hon")
+                                             ,@opt
+                                             "-m" "compileall"
+                                             "-f" ; force rebuild
+                                             ;; Don't build lib2to3, becau=
se it contains Python 3 code.
+                                             "-x" "lib2to3/.*"
+                                             ,file)))
+                                  (find-files out "\\.py$")))
+                      (list '() '("-O") '("-OO")))
+                     #t))))))))))
+
 (define-public python2-called-python
   ;; Both 2.x and 3.x used to be called "python".  In commit
   ;; a7714d42de2c3082f3609d1e63c83d703fb39cf9 (March 2018), we renamed
   the
--8<---------------cut here---------------end--------------->8---

This Python variant builds reproducibly (I disabled the tests for speed
and did this in a separate package to avoid grafting shenanigans and
rebuilds).  The phase is virtually the same as the phase of the same
name in the Python 3 package; only difference is the use of
=E2=80=9C/bin/python=E2=80=9D instead of =E2=80=9C/bin/python3=E2=80=9D.

I wonder if we can simplify this with (setenv "PYTHONHASHSEED" "0")
before any pyc files are built, but I expect that to be problematic.

~~ Ricardo





Information forwarded to bug-guix@HIDDEN:
bug#22010; Package guix. Full text available.
Severity set to 'important' from 'normal' Request was from ludo@HIDDEN (Ludovic Courtès) to control <at> debbugs.gnu.org. Full text available.

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Date: Sun, 7 Feb 2016 18:58:39 -0500
From: Leo Famulari <leo@HIDDEN>
To: 22010 <at> debbugs.gnu.org
Subject: bytecode timestamps
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Those differing bytes are the timestamps of the .py sources files that
correspond to the compiled .pyc / .pyo files. So, the
python-2.7-source-date-epoch.patch is working for software compiled by
the patched compiler, but not on python-2.7 itself.

It's related to <http://debbugs.gnu.org/cgi/bugreport.cgi?bug=22533>.




Information forwarded to bug-guix@HIDDEN:
bug#22010; Package guix. Full text available.

Message received at 22010 <at> debbugs.gnu.org:


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From: ludo@HIDDEN (Ludovic =?utf-8?Q?Court=C3=A8s?=)
To: 22010 <at> debbugs.gnu.org
Subject: Re: bug#22010: Python 2.7.10 not deterministic
References: <871tbef8jl.fsf@HIDDEN>
Date: Sun, 13 Dec 2015 19:17:54 +0100
In-Reply-To: <871tbef8jl.fsf@HIDDEN> ("Ludovic
 \=\?utf-8\?Q\?Court\=C3\=A8s\=22'\?\=
 \=\?utf-8\?Q\?s\?\= message of "Wed, 25 Nov 2015 15:38:54 +0100")
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ludo@HIDDEN (Ludovic Court=C3=A8s) skribis:

> As of v0.9.0-238-gd7572b4 (currently =E2=80=98tk-update=E2=80=99), Python=
 2.7.10 is not
> reproducible:
>
> $ diff -r --no-dereference /gnu/store/q405y94pbnx028mygranaww5pnbqhnq1-py=
thon-2.7.10 ,py
> Binary files /gnu/store/q405y94pbnx028mygranaww5pnbqhnq1-python-2.7.10/li=
b/libpython2.7.so.1.0 and ,py/lib/libpython2.7.so.1.0 differ
> diff -r --no-dereference /gnu/store/q405y94pbnx028mygranaww5pnbqhnq1-pyth=
on-2.7.10/lib/python2.7/config/Makefile ,py/lib/python2.7/config/Makefile
> 31,32c31,32
> < abs_srcdir=3D	/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10
> < abs_builddir=3D	/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10
> ---
>> abs_srcdir=3D	/gnu/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10
>> abs_builddir=3D	/gnu/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10

This problem is sidestepped with commit cb96010, where the daemon always
use /tmp/nix-build*.drv-0 inside the build environment.

It will disappear when we have upgraded the daemon on the build
machines.

Ludo=E2=80=99.




Information forwarded to bug-guix@HIDDEN:
bug#22010; Package guix. Full text available.

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From: ludo@HIDDEN (Ludovic =?utf-8?Q?Court=C3=A8s?=)
To: bug-guix@HIDDEN
Subject: Python 2.7.10 not deterministic
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As of v0.9.0-238-gd7572b4 (currently =E2=80=98tk-update=E2=80=99), Python 2=
.7.10 is not
reproducible:

--8<---------------cut here---------------start------------->8---
$ diff -r --no-dereference /gnu/store/q405y94pbnx028mygranaww5pnbqhnq1-pyth=
on-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=3D	/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10
< abs_builddir=3D	/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10
---
> abs_srcdir=3D	/gnu/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10
> abs_builddir=3D	/gnu/tmp/nix-build-python-2.7.10.drv-0/Python-2.7.10
146c146
< RUNSHARED=3D       LD_LIBRARY_PATH=3D/tmp/nix-build-python-2.7.10.drv-0/P=
ython-2.7.10
---
> RUNSHARED=3D       LD_LIBRARY_PATH=3D/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/lib2to=
3/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 d=
iffer
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 dif=
fer
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=3D/tmp/nix-build-python-2.7.10.drv-0/Pytho=
n-2.7.10',
---
>  'RUNSHARED': 'LD_LIBRARY_PATH=3D/gnu/tmp/nix-build-python-2.7.10.drv-0/P=
ython-2.7.10',
502c502
<  'TESTPYTHON': 'LD_LIBRARY_PATH=3D/tmp/nix-build-python-2.7.10.drv-0/Pyth=
on-2.7.10 ./python -Wd -3 -E -tt',
---
>  'TESTPYTHON': 'LD_LIBRARY_PATH=3D/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=E2=80=99.




Acknowledgement sent to ludo@HIDDEN (Ludovic Courtès):
New bug report received and forwarded. Copy sent to bug-guix@HIDDEN. Full text available.
Report forwarded to bug-guix@HIDDEN:
bug#22010; Package guix. Full text available.
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