From a013de68e095651fdc66692621b25ecde7a1a767 Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Sat, 29 Feb 2020 22:03:12 +0300
Subject: build & publish multi-arch Docker images

---
 .travis.yml | 14 ++++++++++
 Makefile    | 87 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 101 insertions(+)
 create mode 100644 Makefile

diff --git a/.travis.yml b/.travis.yml
index 635c87c..8b3490d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,6 @@
 os: linux
 dist: bionic
+
 jobs:
   include:
     - name: Test locally
@@ -11,3 +12,16 @@ jobs:
       services:
         - docker
       script: ./.travis/docker/test.sh
+    - stage: publish
+      language: minimal
+      name: 'Docker: build & publish multi-arch images'
+      if: branch = master
+      addons:
+        apt:
+          # Newer docker for BuildKit/buildx support:
+          packages:
+            - docker-ce
+          sources:
+            - key_url: 'https://download.docker.com/linux/ubuntu/gpg'
+              sourceline: 'deb https://download.docker.com/linux/ubuntu "$(lsb_release -cs)" stable'
+      script: make login && make buildx/create && make buildx/push
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..5e1d538
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,87 @@
+# Various one-liners which I'm too lazy to remember.
+# Basically a collection of really small shell scripts.
+
+MAKEFLAGS += --warn-undefined-variables
+SHELL := bash
+.SHELLFLAGS := -eu -o pipefail -c
+.DEFAULT_GOAL := all
+.SUFFIXES:
+
+PROJECT := cgit-repos
+# Enable buildx support:
+export DOCKER_CLI_EXPERIMENTAL := enabled
+# Target platforms (used by buildx):
+platforms := linux/amd64,linux/armhf
+# Docker Hub credentials:
+DOCKER_USERNAME := egortensin
+
+.PHONY: all
+all: build
+
+.PHONY: login
+login:
+ifndef DOCKER_PASSWORD
+	$(error Please define DOCKER_PASSWORD)
+endif
+	@echo "$(DOCKER_PASSWORD)" | docker login --username "$(DOCKER_USERNAME)" --password-stdin
+
+.PHONY: build
+# Build natively by default.
+build: docker/build
+
+.PHONY: clean
+clean:
+	docker system prune --all --force --volumes
+
+.PHONY: push
+# Push multi-arch images by default.
+push: buildx/push
+
+.PHONY: check-build
+check-build:
+ifndef FORCE
+	$(warning Going to build natively; consider `docker buildx build` instead)
+endif
+
+.PHONY: check-push
+check-push:
+ifndef FORCE
+	$(error Please use `docker buildx build --push` instead)
+endif
+
+.PHONY: docker/build
+# `docker build` has week support for multiarch repos (you need to use multiple
+# Dockerfile's, create a manifest manually, etc.), so it's only here for
+# testing purposes, and native builds.
+docker/build: check-build
+	docker build -t "$(DOCKER_USERNAME)/$(PROJECT)" .
+
+.PHONY: docker/push
+# `docker push` would replace the multiarch repo with a single image by default
+# (you'd have to create a manifest and push it instead), so it's only here for
+# testing purposes.
+docker/push: check-push docker/build
+	docker push "$(DOCKER_USERNAME)/$(PROJECT)"
+
+# The simple way to build multiarch repos is `docker buildx`.
+
+.PHONY: fix-binfmt
+# Re-register binfmt_misc formats with the F flag (required e.g. on Bionic):
+fix-binfmt:
+	docker run --rm --privileged docker/binfmt:66f9012c56a8316f9244ffd7622d7c21c1f6f28d
+
+.PHONY: buildx/create
+buildx/create: fix-binfmt
+	docker buildx create --use --name "$(PROJECT)_builder"
+
+.PHONY: buildx/rm
+buildx/rm:
+	docker buildx rm "$(PROJECT)_builder"
+
+.PHONY: buildx/build
+buildx/build:
+	docker buildx build -t "$(DOCKER_USERNAME)/$(PROJECT)" --platform "$(platforms)" --progress plain .
+
+.PHONY: buildx/push
+buildx/push:
+	docker buildx build -t "$(DOCKER_USERNAME)/$(PROJECT)" --platform "$(platforms)" --progress plain --push .
-- 
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