display unused wifi devices

scripts/_common.sh

@@ -14,7 +14,27 @@ free_firmware_packages="firmware-ath9k-htc"
 
 function iw_devices()
 {
-  echo -n $(/sbin/iw dev | grep Interface | grep -v 'mon\.' | grep -v hotspot | awk '{ print $NF }') | tr ' ' '|'
+  /sbin/iw dev | grep Interface | grep -v 'mon\.' | grep -v hotspot | awk '{ print $NF }'
+}
+
+function used_iw_devices()
+{
+  local app_shortname="${app%%__*}"
+  local hotspot_apps=$(yunohost app list --output-as json | jq -r .apps[].id | grep -F $app_shortname)
+  # Remove this app from hotspot apps list
+  local other_hotspot_apps=$(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 ${hotspot_wifi_device} ]]; then
+      echo "${hotspot_wifi_device}"
+    fi
+  done
+}
+
+function unused_iw_devices()
+{
+  # Only prints devices that are not in the list of used devices
+  iw_devices | grep -F -v -f <(used_iw_devices)
 }
 
 function check_armbian_nonfree_conflict()

scripts/config

@@ -27,7 +27,7 @@ final_path=$(ynh_app_setting_get $app final_path)
 #=================================================
 
 get__no_antenna() {
-    if [[ $(iw_devices) == "" ]]
+    if [[ $(unused_iw_devices) == "" ]]
     then
         echo "value: true"
     else
@@ -76,14 +76,15 @@ EOF
 }
 
 get__wifi_device() {
-    if [[ $(iw_devices) == "" ]]
+    local unused_wifi_devices=$(unused_iw_devices)
+    if [[ -z ${unused_wifi_devices} ]]
     then
         echo "choices: []"
     else
         cat << EOF
 choices:
 EOF
-        for device in $(iw_devices | sed "s/|/ /g")
+        for device in $unused_wifi_devices
         do
             echo "  $device: $device"
         done

scripts/install

@@ -138,7 +138,7 @@ ip4_nat_prefix="10.${ip4_nat_prefix_index}.242"
 ip4_dns="${ip4_nat_prefix}.1"
 
 hot_reload_usb_wifi_cards
-wifi_device=$(iw_devices | awk -F\| '{ print $1 }')
+wifi_device=$(unused_iw_devices | head -n 1)
 wifi_secure=1
 wifi_channel=6
 

scripts/restore

@@ -29,6 +29,7 @@ app=$YNH_APP_INSTANCE_NAME
 
 firmware_nonfree=$(ynh_app_setting_get --app=$app --key=firmware_nonfree)
 service_name=$(ynh_app_setting_get --app=$app --key=service_name)
+wifi_device=$(ynh_app_setting_get --app=$app --key=wifi_device)
 
 #=================================================
 # CHECK IF THE APP CAN BE RESTORED
@@ -106,7 +107,10 @@ 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
-wifi_device=$(iw_devices | awk -F\| '{ print $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
 
 if [[ -z $wifi_device ]]; then
 	ynh_app_setting_set --app=$app --key=service_enabled --value=0

scripts/upgrade

@@ -19,6 +19,7 @@ app=$YNH_APP_INSTANCE_NAME
 firmware_nonfree=$(ynh_app_setting_get --app=$app --key=firmware_nonfree)
 service_name=$(ynh_app_setting_get --app=$app --key=service_name)
 
+wifi_device=$(ynh_app_setting_get --app=$app --key=wifi_device)
 wifi_ssid=$(ynh_app_setting_get --app=$app --key=wifi_ssid)
 wifi_secure=$(ynh_app_setting_get --app=$app --key=wifi_secure)
 wifi_passphrase=$(ynh_app_setting_get --app=$app --key=wifi_passphrase)
@@ -201,7 +202,10 @@ ynh_install_app_dependencies $pkg_dependencies
 ynh_script_progression --message="Copying configuration..."
 
 hot_reload_usb_wifi_cards
-wifi_device=$(iw_devices | awk -F\| '{ print $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
 
 mkdir -pm 0755 /etc/hostapd/$app/
 chown root: /etc/hostapd/$app/