===================================================================
RCS file: /cvs/openbsd/fw_update/fw_install.sh,v
retrieving revision 1.41
retrieving revision 1.43
diff -u -r1.41 -r1.43
--- openbsd/fw_update/fw_install.sh	2021/12/01 02:30:43	1.41
+++ openbsd/fw_update/fw_install.sh	2021/12/02 02:56:37	1.43
@@ -1,5 +1,5 @@
 #!/bin/ksh
-#	$OpenBSD: fw_install.sh,v 1.41 2021/12/01 02:30:43 afresh1 Exp $
+#	$OpenBSD: fw_install.sh,v 1.43 2021/12/02 02:56:37 afresh1 Exp $
 set -e
 
 # Copyright (c) 2021 Andrew Hewus Fresh <afresh1@openbsd.org>
@@ -22,6 +22,7 @@
 }
 
 # tmpdir, do_as, unpriv, and unpriv2 are from install.sub
+# modified to use su(1) when not in the installer.
 
 # Create a temporary directory based on the supplied directory name prefix.
 tmpdir() {
@@ -57,7 +58,11 @@
 		chown "$_user" "$_file"
 	fi
 
-	doas -u "$_user" "$@"
+	if [[ -x /usr/bin/su ]]; then
+		/usr/bin/su -s /bin/ksh "$_user" -c "$*"
+	else
+		doas -u "$_user" "$@"
+	fi
 	_rc=$?
 
 	while doas -u "$_user" kill -9 -1 2>/dev/null; do