From: "Gábor Boskovits" <boskovits@gmail.com>
To: Ricardo Wurmus <rekado@elephly.net>
Cc: 22533@debbugs.gnu.org
Subject: bug#22533: Python bytecode reproducibility
Date: Sun, 4 Mar 2018 10:21:17 +0100 [thread overview]
Message-ID: <CAE4v=phoeRvKHG96Y1-_A2TRAK_wNPUyBgMFgq6+Cd9enFScUg@mail.gmail.com> (raw)
In-Reply-To: <87606c23bq.fsf@elephly.net>
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2018-03-03 23:37 GMT+01:00 Ricardo Wurmus <rekado@elephly.net>:
> Hi Guix,
>
> Marius Bakke <mbakke@fastmail.com> writes:
>
> > It would be great to revive this longstanding bug!
>
> Indeed.
>
> Here’s another attempt. As far as I understand, the timestamp in the
> pyc files only affects the header.
>
> Up until Python 3.6 (incl) the header looks like this:
>
> magic | timestamp | size
>
> Since Python 3.7 the header may either contain a timestamp or a hash:
>
> magic | 00000000000000000000000000000000 | timestamp | size
> magic | 00000000000000000000000000000001 | hash | size
>
> This means we likely won’t have this problem any more with Python 3.7.
> For Python 3.6 I guess we could add a final build phase that overwrites
> the timestamp in the *binary*. This needs to happen before any of the
> compiled files are wrapped up in a wheel.
>
> Should we just wait for Python 3.7 which is expected to be released in
> June 2018? We’d still have to deal with this problem in Python 2,
> though.
>
> Is it a bad idea to override the timestamps in the generated binaries?
> I think that we could avoid the recency check then, which was an
> obstacle to resetting the timestamps of the source files.
--
> Ricardo
>
> GPG: BCA6 89B6 3655 3801 C3C6 2150 197A 5888 235F ACAC
> https://elephly.net
>
>
Nix had this issue, it seems they have a python 3.5 solution, which
should be easy to adopt: https://github.com/NixOS/nixpkgs/issues/22570.
WDYT?
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next prev parent reply other threads:[~2018-03-04 9:22 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-02 5:15 bug#22533: Non-determinism in python-3 ".pyc" bytecode Leo Famulari
2016-02-02 8:54 ` Leo Famulari
2016-02-02 20:41 ` Ludovic Courtès
2016-02-04 23:17 ` Leo Famulari
2016-03-29 23:11 ` Cyril Roelandt
2016-03-29 23:13 ` Cyril Roelandt
2016-04-06 8:29 ` Ludovic Courtès
2017-05-26 13:41 ` bug#22533: Python bytecode reproducibility Marius Bakke
2018-03-03 22:37 ` Ricardo Wurmus
2018-03-04 9:21 ` Gábor Boskovits [this message]
2018-03-04 12:46 ` Ricardo Wurmus
2018-03-04 15:30 ` Gábor Boskovits
2018-03-04 19:18 ` Ricardo Wurmus
2018-03-05 0:02 ` Ricardo Wurmus
2018-03-05 0:05 ` Ricardo Wurmus
2018-03-05 15:36 ` Gábor Boskovits
2018-03-05 20:33 ` Gábor Boskovits
2018-03-05 21:46 ` Ricardo Wurmus
2018-03-05 22:02 ` Ricardo Wurmus
2018-03-05 22:06 ` Ricardo Wurmus
2018-03-05 23:21 ` Marius Bakke
2018-03-06 13:28 ` Ricardo Wurmus
2018-03-06 14:43 ` Ricardo Wurmus
2018-03-06 14:57 ` Gábor Boskovits
2018-03-08 10:39 ` Gábor Boskovits
2019-01-14 13:40 ` Ricardo Wurmus
2019-02-03 21:22 ` Ricardo Wurmus
2019-02-04 22:39 ` Ludovic Courtès
2018-03-05 9:25 ` Ludovic Courtès
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