From 23ac2b6c9fee1822d05db61b95580a97ce344f01 Mon Sep 17 00:00:00 2001
From: "Bernhard M. Wiedemann" <bwiedemann@suse.de>
Date: Sun, 23 Feb 2020 21:04:47 +0100
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.

Also use UTC to be independent of timezone.

This variant only works with GNU date.
---
 Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 4685f5b8..82844c89 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,8 @@
 NAME    := k9s
 PACKAGE := github.com/derailed/$(NAME)
 GIT     := $(shell git rev-parse --short HEAD)
-DATE    := $(shell date +%FT%T%Z)
+SOURCE_DATE_EPOCH ?= $(shell date +%s)
+DATE    := $(shell date -u -d @${SOURCE_DATE_EPOCH} +%FT%T%Z)
 VERSION  ?= v0.14.0
 IMG_NAME := derailed/k9s
 IMAGE    := ${IMG_NAME}:${VERSION}