From 337880deaa7ea5d86e5c7de63faa1c976d6114cf Mon Sep 17 00:00:00 2001
From: Michael Brown
Date: Tue, 19 Dec 2023 14:39:36 +0000
Subject: [build] Use SOURCE_DATE_EPOCH for FAT serial number if it exists

Reported-by: Bernhard M. Wiedemann <bwiedemann@suse.de>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
---
 src/util/genfsimg | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/util/genfsimg b/src/util/genfsimg
index 0c069279..a981a62d 100755
--- a/src/util/genfsimg
+++ b/src/util/genfsimg
@@ -269,6 +269,10 @@ if [ -n "${FATIMG}" ] ; then
 	FATSIZE=$(( FATCYLS * 504 ))
 	FATARGS="-s 63 -h 16 -t ${FATCYLS}"
     fi
+    if [ -n "${SOURCE_DATE_EPOCH:-}" ] ; then
+	FATSERIAL=$(( SOURCE_DATE_EPOCH % 100000000 ))
+	FATARGS="${FATARGS} -N ${FATSERIAL}"
+    fi
     truncate -s "${FATSIZE}K" "${FATIMG}"
     mformat -v iPXE -i "${FATIMG}" ${FATARGS} ::
     mcopy -i "${FATIMG}" -s "${FATDIR}"/* ::
-- 
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