From 4c5c8d964583080e60c56526c04a9e37a4b7949e Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Tue, 28 Jan 2020 01:40:01 +0300
Subject: docker: multi-arch builds

---
 .travis.yml |  42 ++++++++++++++++++++++--
 Makefile    | 105 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 144 insertions(+), 3 deletions(-)
 create mode 100644 Makefile

diff --git a/.travis.yml b/.travis.yml
index 02d7099..5c0b0c6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -59,7 +59,32 @@ jobs:
         - true
       script:
         - ./cmake/tools/clang-format.py --clang-format clang-format-9
-    - name: Build Docker images
+    - name: Build and publish multi-arch images
+      language: minimal
+      addons:
+        apt:
+          update: true
+          # Newer docker for BuildKit/buildx support:
+          sources:
+            - key_url: 'https://download.docker.com/linux/ubuntu/gpg'
+              sourceline: 'deb https://download.docker.com/linux/ubuntu "$(lsb_release -cs)" stable'
+          packages:
+            - docker-ce
+      install:
+        # GCR & BuildKit don't work together, e.g.:
+        # https://github.com/moby/buildkit/issues/606
+        - echo '{}' | sudo tee /etc/docker/daemon.json
+        - sudo systemctl restart docker
+      # Clear before_script:
+      before_script:
+        - true
+      script: |-
+          if [ "$TRAVIS_BRANCH" = master ]; then
+              make login && make builder/create && make push
+          else
+              make builder/create && make buildx
+          fi
+    - name: Build native images using Compose
       language: minimal
       # Don't install the unnecessary dependencies:
       addons:
@@ -70,5 +95,16 @@ jobs:
       # Clear before_script:
       before_script:
         - true
-      script:
-        - docker-compose build
+      script: make compose-build
+    - name: Build native images using Docker
+      language: minimal
+      # Don't install the unnecessary dependencies:
+      addons:
+        apt:
+          update: false
+      services:
+        - docker
+      # Clear before_script:
+      before_script:
+        - true
+      script: make docker-build
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..9f3cb15
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,105 @@
+# Various one-liners which I'm too lazy to remember.
+# Basically a collection of really small shell scripts.
+
+PROJECT = math_server
+# Enable buildx support:
+export DOCKER_CLI_EXPERIMENTAL = enabled
+# Target platforms (used by buildx):
+platforms = linux/amd64,linux/armhf
+# Docker Hub credentials:
+DOCKER_USERNAME = egortensin
+
+all: build
+
+login:
+ifndef DOCKER_PASSWORD
+	$(error Please define DOCKER_PASSWORD)
+endif
+	@echo "$(DOCKER_PASSWORD)" | docker login --username "$(DOCKER_USERNAME)" --password-stdin
+
+# Re-register binfmt_misc formats with the F flag (required i.e. on Bionic):
+fix-binfmt:
+	docker run --rm --privileged docker/binfmt:66f9012c56a8316f9244ffd7622d7c21c1f6f28d
+
+binfmt: fix-binfmt
+
+# `docker build` has week support for multiarch repos (you need to use multiple
+# Dockerfile's, create a manifest manually, etc.), so it's only here for
+# testing purposes, and native builds.
+docker-build/%:
+ifndef FORCE
+	$(warning Consider using `docker buildx` instead)
+endif
+	docker build -f "$*/Dockerfile" -t "$(DOCKER_USERNAME)/math-$*" .
+
+docker-build: docker-build/client docker-build/server
+
+# `docker-compose build` has the same problems as `docker build`.
+compose-build:
+ifndef FORCE
+	$(warning Consider using `docker buildx` instead)
+endif
+	docker-compose build
+
+# The simple way to build multiarch repos.
+builder/create: fix-binfmt
+	docker buildx create --use --name "$(PROJECT)_builder"
+
+builder/rm:
+	docker buildx rm "$(PROJECT)_builder"
+
+buildx/%:
+	docker buildx build -f "$*/Dockerfile" -t "$(DOCKER_USERNAME)/math-$*" --platform "$(platforms)" --progress plain .
+
+buildx: buildx/client buildx/server
+
+# Build natively by default.
+build: compose-build
+
+# `docker push` would replace the multiarch repo with a single image by default
+# (you'd have to create a manifest and push it instead), so it's only here for
+# testing purposes.
+check-docker-push:
+ifndef FORCE
+	$(error Please do not use `docker push`)
+endif
+
+docker-push/%: check-docker-push docker-build/%
+	docker push "$(DOCKER_USERNAME)/math-$*"
+
+docker-push: check-docker-push docker-push/client docker-push/server
+
+# `docker-compose push` has the same problems as `docker push`.
+check-compose-push:
+ifndef FORCE
+	$(error Please do not use `docker-compose push`)
+endif
+
+compose-push: check-compose-push compose-build
+	docker-compose push
+
+# The simple way to push multiarch repos.
+buildx-push/%:
+	docker buildx build -f "$*/Dockerfile" -t "$(DOCKER_USERNAME)/math-$*" --platform "$(platforms)" --progress plain --push .
+
+buildx-push: buildx-push/client buildx-push/server
+
+# buildx is used by default.
+push: buildx-push
+
+pull:
+	docker-compose pull
+
+up:
+	docker-compose up -d server
+
+run/client:
+	docker-compose --rm run client
+
+down:
+	docker-compose down --volumes
+
+clean:
+	docker system prune --all --force --volumes
+
+.PHONY: all login fix-binfmt binfmt docker-build compose-build builder/create builder/rm buildx build check-docker-push docker-push check-compose-push compose-push buildx-push push pull up run/client down clean
-- 
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