[build] Use SOURCE_DATE_EPOCH for isohybrid MBR ID if it exists

Signed-off-by: Michael Brown <mcb30@ipxe.org>

diff --git a/src/util/genfsimg b/src/util/genfsimg
index 3c8b0c898e29c012b4a2c0e77822821a29039587..1635a11acb8258566c1bfed949eac6c28cfc761d 100755 (executable)
--- 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