switch to multistage docker build

Dockerfile

@@ -12,20 +12,7 @@
 # 
 # docker run --name rtl_433 -d -e MQTT_HOST=<mqtt-broker.example.com>   --privileged -v /dev/bus/usb:/dev/bus/usb  <image>
 
-FROM debian:stretch
-
-LABEL Description="This image is used to start a script that will monitor for events on 433,92 Mhz" Vendor="MarCoach" Version="1.0"
-LABEL Maintainer="Jordan Ochocki"
-
-#
-# Define environment variables
-# 
-# Use this variable when creating a container to specify the MQTT broker host.
-ENV MQTT_HOST ""
-ENV MQTT_PORT 1883
-ENV MQTT_TOPIC rtl_433/+/events
-ENV DISCOVERY_PREFIX homeassistant
-ENV DISCOVERY_INTERVAL 600
+FROM debian:stretch AS intermediate
 
 #
 # First install software packages needed to compile RTL-SDR and rtl_433
@@ -46,11 +33,6 @@ RUN apt-get update && apt-get install --no-install-recommends -y \
   python-pip \
   && rm -rf /var/lib/apt/lists/*
 
-#
-# Install Paho-MQTT client
-#
-RUN pip install paho-mqtt
-
 #
 # Pull RTL_433 source code from GIT, compile it and install it
 #
@@ -63,6 +45,51 @@ RUN git clone https://github.com/merbanan/rtl_433.git \
   && make \
   && make install
 
+#
+# Cleanup
+#
+#RUN apt-get purge -y \
+#  git \
+#  build-essential \
+#  autoconf \
+#  cmake \
+#  pkg-config \
+#  && apt-get autoremove -y \
+#  && rm -r /~/rtl_433
+
+FROM debian:stretch AS final
+
+#
+# Define environment variables
+# 
+# Use this variable when creating a container to specify the MQTT broker host.
+ENV MQTT_HOST ""
+ENV MQTT_PORT 1883
+ENV MQTT_TOPIC rtl_433/+/events
+ENV DISCOVERY_PREFIX homeassistant
+ENV DISCOVERY_INTERVAL 600
+
+RUN apt-get update && apt-get install --no-install-recommends -y \
+  libtool \
+  libusb-1.0.0-dev \
+  librtlsdr-dev \
+  rtl-sdr \
+  python \
+  python-setuptools \
+  python-wheel \
+  python-pip \
+  && rm -rf /var/lib/apt/lists/*
+
+COPY --from=intermediate /usr/local/include/rtl_433.h /usr/local/include/rtl_433.h
+COPY --from=intermediate /usr/local/include/rtl_433_devices.h /usr/local/include/rtl_433_devices.h
+COPY --from=intermediate /usr/local/bin/rtl_433 /usr/local/bin/rtl_433
+COPY --from=intermediate /usr/local/etc/rtl_433 /usr/local/etc/rtl_433
+
+#
+# Install Paho-MQTT client
+#
+RUN pip install paho-mqtt
+
 #
 # Blacklist kernel modules for RTL devices
 #
@@ -74,18 +101,6 @@ COPY rtl.blacklist.conf /etc/modprobe.d/rtl.blacklist.conf
 COPY entry.sh rtl_433_mqtt_hass.py /scripts/
 RUN chmod +x /scripts/entry.sh
 
-#
-# Cleanup
-#
-RUN apt-get purge -y \
-  git \
-  build-essential \
-  autoconf \
-  cmake \
-  pkg-config \
-  && apt-get autoremove -y \
-  && rm -r /~/rtl_433
-
 #
 # Execute entry script
 #

entry.sh

@@ -1,2 +1,2 @@
 #!/bin/sh
-rtl_433 -F $MQTT_HOST -M utc | python /scripts/rtl_433_mqtt_hass.py
+rtl_433 -F mqtt://$MQTT_HOST:$MQTT_PORT -M utc | python /scripts/rtl_433_mqtt_hass.py