Double quote to prevent globbing and word splitting

shellcheck complained about missing double quotes in
`components/9990-networking.sh`.

diff --git a/components/9990-networking.sh b/components/9990-networking.sh
index 2927107..9cc3674 100755 (executable)
--- a/components/9990-networking.sh
+++ b/components/9990-networking.sh
@@ -84,7 +84,7 @@ do_netsetup ()
                fi
 
                # split args of ethdevice=eth0,eth1 into "eth0 eth1"
-               for device in $(echo $ETHDEVICE | sed 's/,/ /g')
+               for device in $(echo "$ETHDEVICE" | sed 's/,/ /g')
                do
                        devlist="$devlist $device"
                done
@@ -92,12 +92,12 @@ do_netsetup ()
                for dev in $devlist
                do
                        echo "Executing ipconfig -t $ETHDEV_TIMEOUT $dev"
-                       ipconfig -t "$ETHDEV_TIMEOUT" $dev | tee -a /netboot.config
+                       ipconfig -t "$ETHDEV_TIMEOUT" "$dev" | tee -a /netboot.config
 
                        # if configuration of device worked we should have an assigned
                        # IP address, if so let's use the device as $DEVICE for later usage.
                        # simple and primitive approach which seems to work fine
-                       if ifconfig $dev | grep -q -E 'inet.*addr:|inet [0-9][0-9]*.[0-9][0-9]*.[0-9][0-9]*.[0-9][0-9]*'
+                       if ifconfig "$dev" | grep -q -E 'inet.*addr:|inet [0-9][0-9]*.[0-9][0-9]*.[0-9][0-9]*.[0-9][0-9]*'
                        then
                                export DEVICE="$dev"
                                break
@@ -105,9 +105,9 @@ do_netsetup ()
                done
        else
                for interface in ${DEVICE}; do
-                       ipconfig -t "$ETHDEV_TIMEOUT" ${interface} | tee /netboot-${interface}.config
+                       ipconfig -t "$ETHDEV_TIMEOUT" "${interface}" | tee "/netboot-${interface}.config"
 
-                       [ -e /run/net-${interface}.conf ] && . /run/net-${interface}.conf
+                       [ -e "/run/net-${interface}.conf" ] && . "/run/net-${interface}.conf"
 
                        if [ "$IPV4ADDR" != "0.0.0.0" ]
                        then
@@ -121,14 +121,14 @@ do_netsetup ()
                # source relevant ipconfig output
                OLDHOSTNAME=${HOSTNAME}
 
-               [ -e /run/net-${interface}.conf ] && . /run/net-${interface}.conf
+               [ -e "/run/net-${interface}.conf" ] && . "/run/net-${interface}.conf"
 
-               [ -z ${HOSTNAME} ] && HOSTNAME=${OLDHOSTNAME}
+               [ -z "${HOSTNAME}" ] && HOSTNAME="${OLDHOSTNAME}"
                export HOSTNAME
 
                if [ -n "${interface}" ]
                then
-                       HWADDR="$(cat /sys/class/net/${interface}/address)"
+                       HWADDR="$(cat "/sys/class/net/${interface}/address")"
                fi
 
                # Only create /etc/hosts if FQDN is known (to let 'hostname -f' query