Node-Red - add support for node-red-contrib-generic-ble

Following on from issue SensorsIot#64, this adds support for Bluetooth in
Node-Red:

1. Adds two volume mappings to the template `service.yml`:

	```
	- /var/run/docker.sock:/var/run/docker.sock
	- /var/run/dbus/system_bus_socket:/var/run/dbus/system_bus_socket
	```

2. Adds device mappings to the template `service.yml`:

	```
	devices:
		- "/dev/ttyAMA0:/dev/ttyAMA0"
		- "/dev/vcio:/dev/vcio"
		- "/dev/gpiomem:/dev/gpiomem"
	```

3. Changes `build.sh` to:

	* unconditionally satisfy the `eudev-dev` dependency for
`node-red-contrib-generic-ble` by inserting these lines in the
generated `Dockerfile`:

		```
		USER root
		RUN apk update
		RUN apk upgrade
		RUN apk add --no-cache eudev-dev
		```

	* Add `node-red-contrib-generic-ble` to the list of optional nodes.

4. Changes `menu.sh` to:

	* define a `user_in_group` function to facilitate checking whether
the current user is a member of a particular group.
	* extends the initial checking performed by the menu to ensure that
the current user is a member of both `docker` and `bluetooth` groups.

> On the first run of the menu after this patch is applied, most users
will likely encounter a reboot prompt enforcing membership of the
`bluetooth` group.

.templates/nodered/build.sh

@@ -40,6 +40,7 @@ node_selection=$(whiptail --title "Node-RED nodes" --checklist --separate-output
 	"node-red-contrib-alexa-local" " " "OFF" \
 	"node-red-contrib-heater-controller" " " "OFF" \
 	"node-red-contrib-deconz" " " "OFF" \
+	"node-red-contrib-generic-ble" " " "OFF" \
 	3>&1 1>&2 2>&3)
 
 ##echo "$check_selection"
@@ -51,6 +52,12 @@ sqliteflag=0
 
 touch $nr_dfile
 echo "FROM nodered/node-red:latest" >$nr_dfile
+
+echo "USER root" >>$nr_dfile
+echo "RUN apk update" >>$nr_dfile
+echo "RUN apk upgrade" >>$nr_dfile
+echo "RUN apk add --no-cache eudev-dev" >>$nr_dfile
+
 #node red install script inspired from https://tech.scargill.net/the-script/
 echo "RUN for addonnodes in \\" >>$nr_dfile
 for checked in "${checked_nodes[@]}"; do

.templates/nodered/service.yml

@@ -9,3 +9,9 @@
       - "1880:1880"
     volumes:
       - ./volumes/nodered/data:/data
+      - /var/run/docker.sock:/var/run/docker.sock
+      - /var/run/dbus/system_bus_socket:/var/run/dbus/system_bus_socket
+    devices:
+      - "/dev/ttyAMA0:/dev/ttyAMA0"
+      - "/dev/vcio:/dev/vcio"
+      - "/dev/gpiomem:/dev/gpiomem"

menu.sh

@@ -72,7 +72,7 @@ declare -a armhf_keys=(
 	"adminer"
 	"openhab"
 	"zigbee2mqtt"
-  	"deconz"
+	"deconz"
 	"pihole"
 	"plex"
 	"tasmoadmin"
@@ -133,6 +133,11 @@ function command_exists() {
 	command -v "$@" > /dev/null 2>&1
 }
 
+function user_in_group()
+{
+    groups | grep -q "\b$1\b"
+}
+
 function minimum_version_check() {
 	# minimum_version_check required_version current_major current_minor current_build
 	# minimum_version_check "1.2.3" 1 2 3
@@ -355,8 +360,29 @@ if command_exists docker; then
 			sudo apt upgrade docker docker-compose
 		fi
 	fi
+
+	requestRebootflag=0
+
+	for G in docker bluetooth ; do
+
+		if user_in_group $G ; then
+			echo "checked membership of $G group."
+		else
+			echo "user is NOT a member of the $G group. Setting it now."
+			sudo usermod -G $G -a $USER
+			requestRebootflag=1
+		fi
+
+	done
+
+	if [ $requestRebootflag = 1 ] ; then
+		if (whiptail --title "Restart Required" --yesno "It is recommended that you restart your device now. Select yes to do so now" 20 78); then
+			sudo reboot
+		fi
+	fi
+
 else
-	echo "docker not installed"
+	echo "docker not installed - you must choose Install Docker"
 fi
 
 #---------------------------------------------------------------------------------------------------
@@ -384,7 +410,8 @@ case $mainmenu_selection in
 	else
 		echo "Install Docker"
 		curl -fsSL https://get.docker.com | sh
-		sudo usermod -aG docker $USER
+		sudo usermod -G docker -a $USER
+		sudo usermod -G bluetooth -a $USER
 	fi
 
 	if command_exists docker-compose; then