tjh.dev
automake-1.15: deterministic documentation generation
automake 1.15 uses a bundled version of help2man from 2012 that
does not support the SOURCE_DATE_EPOCH environment variable.
This means that the build date is included in the generated
documentation, breaking reproducibility.
This changes adds the SOURCE_DATE_EPOCH support from the current
help2man to the version bundled in automake 1.15.
authored by David Terry and committed by Frederik Rietdijk cd87f1ba 3cf749b5
+2
pkgs/development/tools/misc/automake/automake-1.15.x.nix
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pkgs/development/tools/misc/automake/automake-1.15.x.nix
+41
pkgs/development/tools/misc/automake/help2man-SOURCE_DATE_EPOCH-support.patch
+41
pkgs/development/tools/misc/automake/help2man-SOURCE_DATE_EPOCH-support.patch
···
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From 2e3357d7f0d63f1caeb40d9644c2436a5cd0da5f Mon Sep 17 00:00:00 2001
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From: David Terry <me@xwvvvvwx.com>
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Date: Fri, 18 Oct 2019 10:23:11 +0200
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Subject: [PATCH] help2man: add support for SOURCE_DATE_EPOCH
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---
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doc/help2man | 14 +++++++++++++-
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1 file changed, 13 insertions(+), 1 deletion(-)
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diff --git a/doc/help2man b/doc/help2man
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index af4306f..4a64167 100755
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--- a/doc/help2man
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+++ b/doc/help2man
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@@ -213,11 +213,23 @@ sub get_option_value;
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my $help_text = get_option_value $ARGV[0], $help_option;
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$version_text ||= get_option_value $ARGV[0], $version_option;
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+# By default the generated manual pages will include the current date. This may
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+# however be overriden by setting the environment variable $SOURCE_DATE_EPOCH
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+# to an integer value of the seconds since the UNIX epoch. This is primarily
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+# intended to support reproducible builds (wiki.debian.org/ReproducibleBuilds)
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+# and will additionally ensure that the output date string is UTC.
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+my $epoch_secs = time;
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+if (exists $ENV{SOURCE_DATE_EPOCH} and $ENV{SOURCE_DATE_EPOCH} =~ /^(\d+)$/)
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+{
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+ $epoch_secs = $1;
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+ $ENV{TZ} = 'UTC';
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+}
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+
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# Translators: the following message is a strftime(3) format string, which in
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# the English version expands to the month as a word and the full year. It
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# is used on the footer of the generated manual pages. If in doubt, you may
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# just use %x as the value (which should be the full locale-specific date).
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-my $date = enc strftime _("%B %Y"), localtime;
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+my $date = enc strftime _("%B %Y"), localtime $epoch_secs;
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(my $program = $ARGV[0]) =~ s!.*/!!;
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my $package = $program;
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my $version;
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--
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2.23.0
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