From 74c54461cbb67e5ba20fc8119982a09121221853 Mon Sep 17 00:00:00 2001
From: Michael Brown <mcb30@ipxe.org>
Date: Mon, 24 May 2021 15:38:54 +0100
Subject: [build] Use SOURCE_DATE_EPOCH for isohybrid MBR ID if it exists

Signed-off-by: Michael Brown <mcb30@ipxe.org>
---
 src/util/genfsimg | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/util/genfsimg b/src/util/genfsimg
index 3c8b0c8..1635a11 100755
--- a/src/util/genfsimg
+++ b/src/util/genfsimg
@@ -307,7 +307,11 @@ if [ -n "${ISOIMG}" ] ; then
 	    -publisher "ipxe.org" -sysid "iPXE" -o "${ISOIMG}" \
 	    ${ISOARGS} "${ISODIR}"
     if isohybrid --version >/dev/null 2>&1 ; then
-	isohybrid "${ISOIMG}"
+	ISOHYBRIDARGS=
+	if [ -n "${SOURCE_DATE_EPOCH:-}" ] ; then
+	    ISOHYBRIDARGS="${ISOHYBRIDARGS} --id ${SOURCE_DATE_EPOCH}"
+	fi
+	isohybrid ${ISOHYBRIDARGS} "${ISOIMG}"
     fi
 fi
 
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