From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: [PATCH] Add 12 rubygems.
Date: Wed, 30 Dec 2015 18:26:26 +0100
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References: <56821E47.9010400@uq.edu.au> <56821F70.4010202@uq.edu.au>
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In-Reply-To: <56821F70.4010202@uq.edu.au> (Ben Woodcroft's message of "Tue, 29
	Dec 2015 15:51:44 +1000")
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To: Ben Woodcroft <b.woodcroft@uq.edu.au>
Cc: "guix-devel@gnu.org" <guix-devel@gnu.org>

Ben Woodcroft <b.woodcroft@uq.edu.au> skribis:

> On 29/12/15 15:46, Ben Woodcroft wrote:
>>
>> Unfortunately none of these builds are reproducible because rubygems
>> in Guix generally aren't. For one, this is because .gem files are
>> archives whose contents are timestamped.
> I should clarify. What I meant was the cache .gem files
>
> /gnu/store/ib83mg5zsyr5x2w0m3i1f84gdvdbp5x9-ruby-ascii85-1.0.2/lib/ruby/g=
ems/2.2.0/cache$
> tar tvf Ascii85-1.0.2.gem |head
> -r--r--r-- wheel/wheel     703 2015-12-27 22:44 metadata.gz
> -r--r--r-- wheel/wheel    7436 2015-12-27 22:44 data.tar.gz
> -r--r--r-- wheel/wheel     268 2015-12-27 22:44 checksums.yaml.gz

We should arrange so that gems are created with a fixed timestamp and
UID/GID, and a well-defined file ordering, as with:

  --mtime=3D@0 --sort=3Dname --owner=3Droot:0 --group=3Droot:0

We also need to make sure gzip is always run with -n/--no-name.  That
way, the gz files above will not include an additional timestamp.

>From what I can see in
<git://git.debian.org/git/reproducible/notes.git>, this is not addressed
yet in other distros.

HTH,
Ludo=E2=80=99.