Re: Set FORCE_SOURCE_DATE=1 by default

[Vagrant Cascadian <vagrant@reproducible-builds.org>]

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On 2022-06-21, Vagrant Cascadian wrote:
> On 2022-06-15, Ludovic Courtès 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=1. 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 timestamp.
>>> -See https://reproducible-builds.org/specs/source-date-epoch/."
>>> -  (setenv "SOURCE_DATE_EPOCH" "1"))
>>> +  "Set the 'SOURCE_DATE_EPOCH' and 'FORCE_SOURCE_DATE' environment variables.
>>> +This is used by tools that incorporate timestamps as a way to tell them to use
>>> +a fixed timestamp.  See https://reproducible-builds.org/docs/source-date-epoch/."
>>> +  (setenv "SOURCE_DATE_EPOCH" "1")
>>> +  (setenv "FORCE_SOURCE_DATE" "1"))
>>
>> I’d 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
--- 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))
 
 (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 timestamp.
-See https://reproducible-builds.org/specs/source-date-epoch/."
-  (setenv "SOURCE_DATE_EPOCH" "1"))
+  "Set the 'SOURCE_DATE_EPOCH' and 'FORCE_SOURCE_DATE' environment variables.
+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 documentation
+in various packages. See
+https://reproducible-builds.org/docs/source-date-epoch/."
+  (setenv "SOURCE_DATE_EPOCH" "1")
+  (setenv "FORCE_SOURCE_DATE" "1"))
 
 (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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