From c20f0bb32976aa1f9d2cc3f6d133d6136fd2586b Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Sun, 26 Jan 2020 15:27:08 +0300
Subject: dump1090: multi-stage build

I think (?) it let's me _not_ care about removing build artifacts, which
is convinient.
---
 dump1090/Dockerfile | 43 +++++++++++++++++++++++++------------------
 1 file changed, 25 insertions(+), 18 deletions(-)

diff --git a/dump1090/Dockerfile b/dump1090/Dockerfile
index 0edd388..971e912 100644
--- a/dump1090/Dockerfile
+++ b/dump1090/Dockerfile
@@ -1,36 +1,43 @@
-FROM debian:stretch-slim
-
-LABEL maintainer="Egor Tensin <Egor.Tensin@gmail.com>"
+FROM debian:stretch-slim AS builder
 
-WORKDIR /tmp
+# Don't prompt:
+ENV DEBIAN_FRONTEND=noninteractive
 
 # Variables:
 ARG DUMP1090_VERSION=3.7.2
 
-# Don't prompt:
-ENV DEBIAN_FRONTEND=noninteractive
+WORKDIR /tmp
 
-# Build and install the dump1090-fa package:
+# Build the dump1090-fa package:
 ADD ["https://github.com/flightaware/dump1090/archive/v${DUMP1090_VERSION}.tar.gz", "./dump1090-${DUMP1090_VERSION}.tar.gz"]
 
-    # dump1090 dependencies (from README at https://github.com/flightaware/dump1090):
+    # dump1090 build dependencies (from README at https://github.com/flightaware/dump1090/blob/v3.7.2/README.md):
 RUN build_deps='build-essential debhelper librtlsdr-dev pkg-config dh-systemd libncurses5-dev libbladerf-dev' && \
-    # dump1090-fa runtime dependencies:
-    runtime_deps='librtlsdr0 libncurses5 libbladerf1' && \
-    # Supervisor to run both dump1090-fa and lighttpd:
-    supervisor='supervisor' && \
     apt-get update -yq && \
-    apt-get install -yq --no-install-recommends $build_deps $runtime_deps $supervisor && \
+    apt-get install -yq --no-install-recommends $build_deps && \
     tar xzf dump1090-${DUMP1090_VERSION}.tar.gz && \
     cd -- dump1090-${DUMP1090_VERSION} && \
     dpkg-buildpackage -b && \
-    dpkg-buildpackage -Tclean && \
     cd -- .. && \
     dump1090_arch="$( dpkg --print-architecture )" && \
-    apt-get install -yq ./dump1090-fa_${DUMP1090_VERSION}_${dump1090_arch}.deb && \
-    rm -rf -- dump1090-${DUMP1090_VERSION}.tar.gz dump1090-${DUMP1090_VERSION}/ && \
-    find . -mindepth 1 -maxdepth 1 -type f -\( -name '*.buildinfo' -o -name '*.changes' -o -name '*.deb' -\) -delete && \
-    apt-get purge -yq --auto-remove -o APT::AutoRemove::RecommendsImportant=false $build_deps
+    mv -- dump1090-fa_${DUMP1090_VERSION}_${dump1090_arch}.deb dump1090-fa.deb
+
+FROM debian:stretch-slim
+
+LABEL maintainer="Egor Tensin <Egor.Tensin@gmail.com>"
+
+# Don't prompt:
+ENV DEBIAN_FRONTEND=noninteractive
+
+WORKDIR /tmp
+
+COPY --from=builder ["/tmp/dump1090-fa.deb", "./"]
+
+RUN apt-get update -yq && \
+    # Supervisor to run both dump1090-fa and lighttpd:
+    apt-get install -yq --no-install-recommends supervisor && \
+    apt-get install -yq ./dump1090-fa.deb && \
+    rm -- ./dump1090-fa.deb
 
 # Create the /run/dump1090-fa directory, typically created by systemd:
 RUN mkdir --mode=0755 /run/dump1090-fa
-- 
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