[docker] use --device instead of --privileged for USB

also "autodetect" potentially interesting /dev/ttyUSB? and /dev/ttyACM? devices and pass them by default.

docker/Makefile

@@ -8,7 +8,6 @@ help:
 	@echo "   1. make pull             - pull all pprz images"
 	@echo "   1. make clean            - remove all pprz images"
 	@echo "   2. make bash             - run bash on pprz-dev"
-	@echo "   2. make bash_usb         - run bash and enable USB"
 	@echo "   2. make paparazzi        - run paparazzi center on pprz-dev"
 	@echo ""
 
@@ -27,9 +26,5 @@ clean:
 bash:
 	@bash run.sh -i -t flixr/pprz-dev bash
 
-bash_usb:
-	@ENABLE_USB=1 bash ./run.sh -i -t flixr/pprz-dev bash
-
-
 paparazzi:
 	@bash run.sh -i -t flixr/pprz-dev ./paparazzi

docker/run.sh

@@ -34,11 +34,21 @@ PULSE_AUDIO_OPTS="--volume=/run/user/${USER_UID}/pulse:/run/pulse"
 
 # give the container access to USB, WARNING runs it as priviliged container!
 # use it if ENABLE_USB variable is non-empty/zero
-if [ -n "$ENABLE_USB" ]; then
-    echo "INFO: running as priviliged container to enable USB access!"
+if [ -n "$PRIVILEGED_USB" ]; then
+    echo "WARNING: running as priviliged container to enable complete USB access!"
+    echo "Better pass devices explicitly: ./run.sh -i -t --device=/dev/ttyUSB0 flixr/pprz-dev bash"
     USB_OPTS="--privileged --volume=/dev/bus/usb:/dev/bus/usb"
 fi
 
+# try to detect which USB devices to pass to the container automatically
+# set DISABLE_USB=1 to turn it off
+if [ -z "$DISABLE_USB" ]; then
+    USB_OPTS=$(find /dev -maxdepth 1 \( -name "ttyACM?" -or -name "ttyUSB?" \) -printf "--device=%p ")
+    if [ -n "$USB_OPTS" ]; then
+        echo Passing auto-detected USB devices: $USB_OPTS
+    fi
+fi
+
 # share the paparazzi directory and set it as working directory
 SHARE_PAPARAZZI_HOME_OPTS="--volume=$PAPARAZZI_HOME:$PPRZ_HOME_CONTAINER \
   --env=PAPARAZZI_HOME=$PPRZ_HOME_CONTAINER \