From 54a7a5069c9f91d2c8911084d2b11d164a7e25e9 Mon Sep 17 00:00:00 2001
From: "Bernhard M. Wiedemann" <bwiedemann@suse.de>
Date: Thu, 24 Oct 2024 09:32:18 +0200
Subject: [PATCH] Allow to override build date with SOURCE_DATE_EPOCH

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.
---
 tui/build.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/tui/build.rs b/tui/build.rs
index 121931c1..bcaf5e2e 100644
--- a/tui/build.rs
+++ b/tui/build.rs
@@ -1,7 +1,14 @@
+use chrono::{TimeZone, Utc};
+use std::env;
+
 fn main() {
     // Add current date as a variable to be displayed in the 'Linux Toolbox' text.
+    let now = match env::var("SOURCE_DATE_EPOCH") {
+        Ok(val) => { Utc.timestamp_opt(val.parse::<i64>().unwrap(), 0).unwrap() }
+        Err(_) => Utc::now(),
+    };
     println!(
         "cargo:rustc-env=BUILD_DATE={}",
-        chrono::Local::now().format("%Y-%m-%d")
+        now.format("%Y-%m-%d")
     );
 }