quote a variable use

diff --git a/modules/porterbox/files/setup-dchroot b/modules/porterbox/files/setup-dchroot
index e99e54af211b750b308865902aed81700b19faf1..69a18e1499df20a01413afa7def62dcebfdecb6f 100755 (executable)
--- a/modules/porterbox/files/setup-dchroot
+++ b/modules/porterbox/files/setup-dchroot
@@ -244,8 +244,8 @@ debootstrap \
     --variant=buildd \
     --arch="$arch" \
     "$suite" "$rootdir" "$mirror"
-echo "$tuple" > $rootdir/etc/debian_chroot
-echo "force-unsafe-io" > $rootdir/etc/dpkg/dpkg.cfg.d/force-unsafe-io
+echo "$tuple" > "$rootdir/etc/debian_chroot"
+echo "force-unsafe-io" > "$rootdir/etc/dpkg/dpkg.cfg.d/force-unsafe-io"
 
 chroot "$rootdir" apt-get update
 chroot "$rootdir" apt-get install -y --force-yes --no-install-recommends policyrcd-script-zg2