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From: Vagrant Cascadian <vagrant@reproducible-builds.org>
To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Cc: Guix Devel <guix-devel@gnu.org>
Subject: Re: Set FORCE_SOURCE_DATE=1 by default
In-Reply-To: <878rppagl4.fsf@contorta>
References: <87bkv0f52g.fsf@contorta> <87h74muwu0.fsf@gnu.org>
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--=-=-=
Content-Type: text/plain; charset=utf-8
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On 2022-06-21, Vagrant Cascadian wrote:
> On 2022-06-15, Ludovic Court=C3=A8s wrote:
>> Vagrant Cascadian <vagrant@reproducible-builds.org> skribis:
>>> From 7a39330b56934accef14b5e2ac003e211c7c6c5b Mon Sep 17 00:00:00 2001
>>> From: Vagrant Cascadian <vagrant@reproducible-builds.org>
>>> Date: Fri, 10 Jun 2022 16:12:59 -0700
>>> Subject: [PATCH] guix: gnu-build-system: Set FORCE_SOURCE_DATE in
>>>  set-SOURCE-DATE-EPOCH phase.
>>>
>>> * guix/build/gnu-build-system.scm (set-SOURCE-DATE-EPOCH): Set
>>>   FORCE_SOURCE_DATE=3D1. Update URL.
>>
>> [...]
>>
>>>  (define* (set-SOURCE-DATE-EPOCH #:rest _)
>>> -  "Set the 'SOURCE_DATE_EPOCH' environment variable.  This is used by =
tools
>>> -that incorporate timestamps as a way to tell them to use a fixed times=
tamp.
>>> -See https://reproducible-builds.org/specs/source-date-epoch/."
>>> -  (setenv "SOURCE_DATE_EPOCH" "1"))
>>> +  "Set the 'SOURCE_DATE_EPOCH' and 'FORCE_SOURCE_DATE' environment var=
iables.
>>> +This is used by tools that incorporate timestamps as a way to tell the=
m to use
>>> +a fixed timestamp.  See https://reproducible-builds.org/docs/source-da=
te-epoch/."
>>> +  (setenv "SOURCE_DATE_EPOCH" "1")
>>> +  (setenv "FORCE_SOURCE_DATE" "1"))
>>
>> I=E2=80=99d mention above that FORCE_SOURCE_DATE is honored exclusively =
by
>> TeX Live.

Still not terribly happy with it, but I think I can cope with this
updated version:

diff --git a/guix/build/gnu-build-system.scm b/guix/build/gnu-build-system.=
scm
index d84411c090..cbfbd2a209 100644
=2D-- a/guix/build/gnu-build-system.scm
+++ b/guix/build/gnu-build-system.scm
@@ -56,10 +56,14 @@ (define time-monotonic time-tai))
   (else #t))
=20
 (define* (set-SOURCE-DATE-EPOCH #:rest _)
=2D  "Set the 'SOURCE_DATE_EPOCH' environment variable.  This is used by to=
ols
=2Dthat incorporate timestamps as a way to tell them to use a fixed timesta=
mp.
=2DSee https://reproducible-builds.org/specs/source-date-epoch/."
=2D  (setenv "SOURCE_DATE_EPOCH" "1"))
+  "Set the 'SOURCE_DATE_EPOCH' and 'FORCE_SOURCE_DATE' environment variabl=
es.
+This is used by tools that incorporate timestamps as a way to tell them to=
 use
+a fixed timestamp.  Setting 'FORCE_SOURCE_DATE' is needed in order for TeX
+Live to respect 'SOURCE_DATE_EPOCH', which is used to generate documentati=
on
+in various packages. See
+https://reproducible-builds.org/docs/source-date-epoch/."
+  (setenv "SOURCE_DATE_EPOCH" "1")
+  (setenv "FORCE_SOURCE_DATE" "1"))
=20
 (define (first-subdirectory directory)
   "Return the file name of the first sub-directory of DIRECTORY or false, =
when


live well,
  vagrant

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