File 0001-Set-build-date-from-SOURCE_DATE_EPOCH.patch of Package golang-github-prometheus-promu

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File 0001-Set-build-date-from-SOURCE_DATE_EPOCH.patch of Package golang-github-prometheus-promu (Revision 4ada611655d0e414a3041c55f54fe74c)

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From 2098a5128565a72fc1886e996a444cc111e43c36 Mon Sep 17 00:00:00 2001
From: Witek Bedyk <witold.bedyk@suse.com>
Date: Tue, 26 Apr 2022 17:21:46 +0200
Subject: [PATCH] Set build date from SOURCE_DATE_EPOCH

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 PR was done while working on [reproducible builds for
openSUSE](https://en.opensuse.org/openSUSE:Reproducible_Builds).

Signed-off-by: Witek Bedyk <witold.bedyk@suse.com>
---
 cmd/build.go | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/cmd/build.go b/cmd/build.go
index 18f1c5e..694b964 100644
--- a/cmd/build.go
+++ b/cmd/build.go
@@ -20,6 +20,7 @@ import (
 	"log"
 	"os"
 	"path"
+	"strconv"
 	"strings"
 	"text/template"
 	"time"
@@ -146,10 +147,17 @@ func getLdflags(info repository.Info) string {
 	var ldflags []string
 
 	if len(strings.TrimSpace(config.Build.LDFlags)) > 0 {
+		var buildDate time.Time
+		unixBuildDate, err := strconv.ParseInt(os.Getenv("SOURCE_DATE_EPOCH"), 10, 64)
+		if err == nil {
+			buildDate = time.Unix(unixBuildDate, 0)
+		} else {
+			buildDate = time.Now()
+		}
 		var (
 			tmplOutput = new(bytes.Buffer)
 			fnMap      = template.FuncMap{
-				"date":     time.Now().UTC().Format,
+				"date":     buildDate.UTC().Format,
 				"host":     os.Hostname,
 				"repoPath": RepoPathFunc,
 				"user":     UserFunc,
-- 
2.34.1

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File 0001-Set-build-date-from-SOURCE_DATE_EPOCH.patch of Package golang-github-prometheus-promu (Revision 4ada611655d0e414a3041c55f54fe74c)

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