Code review / add quotes around suspicious vars that may be empty

scripts/_common.sh

@@ -25,7 +25,7 @@ function used_iw_devices()
   local other_hotspot_apps=$(grep -F -x -v $app <<< ${hotspot_apps})
   for hotspot_app in ${other_hotspot_apps}; do
     hotspot_wifi_device=$(ynh_app_setting_get --app=$hotspot_app --key=wifi_device)
-    if [[ -n ${hotspot_wifi_device} ]]; then
+    if [[ -n "${hotspot_wifi_device}" ]]; then
       echo "${hotspot_wifi_device}"
     fi
   done

scripts/config

@@ -27,7 +27,7 @@ final_path=$(ynh_app_setting_get $app final_path)
 #=================================================
 
 get__no_antenna() {
-    if [[ $(unused_iw_devices) == "" ]]
+    if [[ "$(unused_iw_devices)" == "" ]]
     then
         echo "value: true"
     else
@@ -39,7 +39,7 @@ get__status() {
     local service_enabled=$(ynh_app_setting_get $app service_enabled)
     if systemctl is-active hostapd@$app -q
     then
-        if [[ $service_enabled -eq 1 ]]
+        if [[ "$service_enabled" -eq 1 ]]
         then
             cat << EOF
 style: success
@@ -54,7 +54,7 @@ ask:
   en: Your Hotspot is running, but it shouldn't !
 EOF
         fi
-    elif [[ $service_enabled -eq 1 ]]
+    elif [[ "$service_enabled" -eq 1 ]]
     then
         cat << EOF
 style: danger
@@ -77,7 +77,7 @@ EOF
 
 get__wifi_device() {
     local unused_wifi_devices=$(unused_iw_devices)
-    if [[ -z ${unused_wifi_devices} ]]
+    if [[ -z "${unused_wifi_devices}" ]]
     then
         echo "choices: []"
     else
@@ -99,11 +99,11 @@ get__dns() {
     ip4_nat_prefix=$(ynh_app_setting_get --app=$app --key=ip4_nat_prefix)
     ip4_dns=$(ynh_app_setting_get --app=$app --key=ip4_dns)
 
-    if [[ -n ${ip6_net} ]] && [[ -z ${ip6_dns} ]]; then
+    if [[ -n "${ip6_net}" ]] && [[ -z "${ip6_dns}" ]]; then
         ip6_dns="${ip6_net}1"
     fi
 
-    if [[ -n ${ip4_nat_prefix} ]] && [[ -z ${ip4_dns} ]]; then
+    if [[ -n "${ip4_nat_prefix}" ]] && [[ -z "${ip4_dns}" ]]; then
         ip4_dns="${ip4_nat_prefix}.1"
     fi
 
@@ -164,11 +164,11 @@ set__dns() {
     ip6_dns="${ip6_dns%%,}"
     ip4_dns="${ip4_dns%%,}"
 
-    if [[ -n ${ip6_net} ]] && [[ -z ${ip6_dns} ]]; then
+    if [[ -n "${ip6_net}" ]] && [[ -z "${ip6_dns}" ]]; then
         ip6_dns="${ip6_net}1"
     fi
 
-    if [[ -n ${ip4_nat_prefix} ]] && [[ -z ${ip4_dns} ]]; then
+    if [[ -n "${ip4_nat_prefix}" ]] && [[ -z "${ip4_dns}" ]]; then
         ip4_dns="${ip4_nat_prefix}.1"
     fi
     

scripts/install

@@ -200,7 +200,7 @@ systemctl disable hostapd --quiet 2>&1
 systemctl stop hostapd 2>&1
 systemctl unmask hostapd 2>&1 # On some system e.g. RPi, for some reason hostapd is masked after install ...
 
-if [[ -n ${wifi_device} ]]; then 
+if [[ -n "${wifi_device}" ]]; then 
 	configure_hostapd
 	configure_dhcp
 fi

scripts/restore

@@ -107,7 +107,7 @@ yunohost service add $service_name --description "Creates a Wi-Fi access point"
 ynh_script_progression --message="Starting a systemd service..."
 
 hot_reload_usb_wifi_cards
-if [[ -z $wifi_device ]] || ! grep -q -F $wifi_device <(unused_iw_devices); then
+if [[ -z "$wifi_device" ]] || ! grep -q -F "$wifi_device" <(unused_iw_devices); then
 	wifi_device=$(unused_iw_devices | head -n 1)
 	ynh_app_setting_set --app=$app --key=wifi_device --value="${wifi_device}"
 fi

scripts/upgrade

@@ -84,7 +84,7 @@ if [ -z $service_name ]; then
 	ynh_app_setting_set --app=$app --key=service_name --value=$service_name
 fi
 
-if [[ -n ${multissid} ]] && [[ ${multissid} -gt 1 ]]; then
+if [[ -n "${multissid}" ]] && [[ "${multissid}" -gt 1 ]]; then
 	wifi_ssid=$(cut -d'|' -f 1 <<< ${wifi_ssid})
 	wifi_secure=$(cut -d'|' -f 1 <<< ${wifi_secure})
 	wifi_passphrase=$(cut -d'|' -f 1 <<< ${wifi_passphrase})
@@ -129,7 +129,7 @@ else
     ip4_dns=$(ynh_app_setting_get --app=$app --key=ip4_dns)
 fi
 
-if [[ -n ${multissid} ]]; then
+if [[ -n "${multissid}" ]]; then
     ynh_app_setting_delete --app=$app --key=multissid
 
 	ynh_secure_remove --file="/etc/hostapd/hostapd.conf"
@@ -138,7 +138,7 @@ if [[ -n ${multissid} ]]; then
 	ynh_secure_remove --file="/etc/dnsmasq.dhcpd/"
 fi
 
-if [[ -z ${advanced} ]]; then
+if [[ -z "${advanced}" ]]; then
     ynh_app_setting_set --app=$app --key=advanced --value=0
 fi
 
@@ -202,8 +202,8 @@ ynh_install_app_dependencies $pkg_dependencies
 ynh_script_progression --message="Copying configuration..."
 
 hot_reload_usb_wifi_cards
-if [[ -z $wifi_device ]] || ! grep -q -F $wifi_device <(unused_iw_devices); then
-	wifi_device=$(unused_iw_devices | head -n 1)
+if [[ -z "$wifi_device" ]] || ! grep -q -F "$wifi_device" <(unused_iw_devices); then
+	wifi_device="$(unused_iw_devices | head -n 1)"
 	ynh_app_setting_set --app=$app --key=wifi_device --value="${wifi_device}"
 fi
 
@@ -217,7 +217,7 @@ install -b -o root -g root -m 0644 ../conf/hostapd.conf.tpl /etc/hostapd/$app/ho
 install -b -o root -g root -m 0644 ../conf/dnsmasq_dhcpdv6.conf.tpl /etc/dnsmasq.$app/dhcpdv6.conf.tpl
 install -b -o root -g root -m 0644 ../conf/dnsmasq_dhcpdv4.conf.tpl /etc/dnsmasq.$app/dhcpdv4.conf.tpl
 
-if [[ -n ${wifi_device} ]]; then 
+if [[ -n "${wifi_device}" ]]; then 
 	configure_hostapd
 	configure_dhcp
 fi