From 29df24fa6c555cbfa39fe17c0070afa815dc2bbf Mon Sep 17 00:00:00 2001
From: "Bernhard M. Wiedemann" <bwiedemann@suse.de>
Date: Wed, 8 Jul 2020 05:05:52 +0200
Subject: [PATCH] Allow to override build date with SOURCE_DATE_EPOCH

in order to make builds reproducible.
See https://reproducible-builds.org/ for why this is good
and https://reproducible-builds.org/specs/source-date-epoch/
for the definition of this variable.

This date call only works with GNU date.

Also use UTC to be independent of timezone.
---
 build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/build b/build
index 882a23e5..60b5d040 100755
--- a/build
+++ b/build
@@ -19,7 +19,7 @@ if [ -z "$VERSION" ]; then
 	fi
 	set -e
 fi
-DATE=$(date --iso-8601=seconds)
+DATE=$(date -u -d "@${SOURCE_DATE_EPOCH:-$(date +%s)}" --iso-8601=seconds)
 COMMIT=${COMMIT:-$(git rev-parse --verify HEAD)}
 LDFLAGS="-X main.version=${VERSION:-master} -X main.commit=${COMMIT} -X main.date=${DATE}"
 export CGO_ENABLED=0