From 80fd6c2400868a24ffd104babd2ddf35c3ff9f0e Mon Sep 17 00:00:00 2001
From: Jakob Borg <jakob@nym.se>
Date: Wed, 29 Jun 2016 18:52:49 +0000
Subject: [PATCH] build: Use SOURCE_DATE_EPOCH for build time stamp when
 available

Apparently common practice for reproducible builds:

   https://reproducible-builds.org/specs/source-date-epoch/

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3364
---
 build.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/build.go b/build.go
index 6e7a9017a..6a633800c 100644
--- a/build.go
+++ b/build.go
@@ -717,10 +717,18 @@ func getBranchSuffix() string {
 }
 
 func buildStamp() int64 {
+	// If SOURCE_DATE_EPOCH is set, use that.
+	if s, _ := strconv.ParseInt(os.Getenv("SOURCE_DATE_EPOCH"), 10, 64); s > 0 {
+		return s
+	}
+
+	// Try to get the timestamp of the latest commit.
 	bs, err := runError("git", "show", "-s", "--format=%ct")
 	if err != nil {
+		// Fall back to "now".
 		return time.Now().Unix()
 	}
+
 	s, _ := strconv.ParseInt(string(bs), 10, 64)
 	return s
 }