From 338a08a0ee2f7d4abb26d9d6c172adead333ea74 Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Sat, 25 Jan 2020 22:46:15 +0300
Subject: Travis: multiarch builds

---
 .travis.yml         | 41 ++++++++++++++++++++++++++++++++++-------
 fr24feed/Dockerfile | 37 +++++++++++++++++++++++++++----------
 2 files changed, 61 insertions(+), 17 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 36aee92..61555a5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,13 +1,40 @@
+# I used this guide to set up multiarch builds:
+# https://mirailabs.io/blog/multiarch-docker-with-buildx/
+# I don't understand it completely at the moment, but whatever.
+
+# TODO: Docker Hub automated builds instead of Travis?
+# TODO: docker-compose instead of docker buildx?
+
 language: minimal
 os: linux
 dist: bionic
-arch: arm64
+
 services:
   - docker
+
+addons:
+  apt:
+    update: true
+    # Newer docker for buildx support:
+    sources:
+      - key_url: 'https://download.docker.com/linux/ubuntu/gpg'
+        sourceline: 'deb https://download.docker.com/linux/ubuntu "$(lsb_release -cs)" stable'
+    packages:
+      - docker-ce
+
+env:
+  # Enable experimental buildx support
+  DOCKER_CLI_EXPERIMENTAL: enabled
+  platforms: linux/i386,linux/amd64,linux/armhf
+
 script:
-  - docker-compose build
-deploy:
-  provider: script
-  on:
-    branch: master
-  script: echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin && docker-compose push
+  - docker run --rm --privileged docker/binfmt:66f9012c56a8316f9244ffd7622d7c21c1f6f28d
+  - docker buildx create --use
+  - docker buildx build --platform "$platforms" dump1090/
+  - docker buildx build --platform "$platforms" fr24feed/
+  - |-
+    if [ "$TRAVIS_BRANCH" = master ]; then
+    echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
+    docker buildx build --platform "$platforms" -t "$DOCKER_USERNAME/dump1090" --push dump1090/
+    docker buildx build --platform "$platforms" -t "$DOCKER_USERNAME/fr24feed" --push fr24feed/
+    fi
diff --git a/fr24feed/Dockerfile b/fr24feed/Dockerfile
index 63eee4f..07c00d3 100644
--- a/fr24feed/Dockerfile
+++ b/fr24feed/Dockerfile
@@ -1,10 +1,33 @@
 # Alpine is a bit too extreme (it doesn't have /etc/localtime, no support for
 # hostname -I, etc.).
 
-FROM debian:stretch-slim
+FROM debian:stretch-slim AS base
+
+# Those are weird hacks, but the alternative (using the apt repository) was
+# unsuitable (no systemctl, etc.).
+
+FROM base as base-386
+ENV fr24feed_directory=linux_x86_binaries
+ENV fr24feed_version=1.0.24-5
+ENV fr24feed_archive_suffix=i386
+
+FROM base AS base-amd64
+ENV fr24feed_directory=linux_x86_64_binaries
+ENV fr24feed_version=1.0.24-5
+ENV fr24feed_archive_suffix=amd64
+
+FROM base AS base-arm
+ENV fr24feed_directory=rpi_binaries
+ENV fr24feed_version=1.0.24-7
+ENV fr24feed_archive_suffix=armhf
+
+ARG TARGETARCH
+FROM base-$TARGETARCH
 
 LABEL maintainer="Egor Tensin <Egor.Tensin@gmail.com>"
 
+ENV fr24feed_archive_name="fr24feed_${fr24feed_version}_${fr24feed_archive_suffix}.tgz"
+
 # Don't prompt:
 ENV DEBIAN_FRONTEND=noninteractive
 
@@ -13,19 +36,13 @@ RUN runtime_deps='ca-certificates procps' && \
     apt-get update -yq && \
     apt-get install -yq --no-install-recommends $runtime_deps
 
-# Variables:
-ARG FR24FEED_VERSION=1.0.24-7
-ARG FR24FEED_ARCH=armhf
-
-# Download fr24feed:
 WORKDIR /tmp
-ADD ["https://repo-feed.flightradar24.com/rpi_binaries/fr24feed_${FR24FEED_VERSION}_${FR24FEED_ARCH}.tgz", "./"]
-RUN tar xzf fr24feed_${FR24FEED_VERSION}_${FR24FEED_ARCH}.tgz
+ADD ["https://repo-feed.flightradar24.com/$fr24feed_directory/$fr24feed_archive_name", "./"]
+RUN tar xzf "$fr24feed_archive_name"
 
-# fr24feed config:
 COPY ["fr24feed.ini", "/etc/"]
 
 EXPOSE 8754
 
-WORKDIR fr24feed_${FR24FEED_ARCH}
+WORKDIR "fr24feed_${fr24feed_archive_suffix}"
 CMD ["./fr24feed"]
-- 
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