From 87e1f5486191a024aa14707e822bbbf87acb00cb Mon Sep 17 00:00:00 2001
From: Jerome Touffe-Blin <jtblin@gf0hn947l0.office.atlassian.com>
Date: Sat, 25 Nov 2023 12:03:40 +1100
Subject: [PATCH] Build docker cross-platform with buildx

---
 .circleci/config.yml | 25 +++++++++++++++++++++++++
 Makefile             | 24 +++++++++++-------------
 2 files changed, 36 insertions(+), 13 deletions(-)

diff --git a/.circleci/config.yml b/.circleci/config.yml
index 7fca8db..30b9605 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -31,6 +31,29 @@ jobs:
       - run:
           name: "build and test"
           command: make build test-race check bench-race coveralls
+  release:
+    docker: # executor type
+      - image: cimg/base:stable # primary container will run the latest, production-ready base image
+        auth:
+          username: $DOCKERHUB_USERNAME
+          password: $DOCKERHUB_PASSWORD
+    steps:
+      - checkout
+      - setup_remote_docker
+      # - restore_cache:
+      #     keys:
+      #       - v1-{{ .Branch }}
+          # paths:
+          #   - /caches/app.tar
+      - run:
+          name: Load Docker image layer cache
+          command: |
+            set +o pipefail
+            docker load -i /caches/app.tar | true
+      - run:
+          name: Docker build
+          command: |
+            make docker
 
 # Orchestrate jobs using workflows
 # See: https://circleci.com/docs/configuration-reference/#workflows
@@ -38,3 +61,5 @@ workflows:
   kube2iam-workflow:
     jobs:
       - build-and-test
+      - release
+
diff --git a/Makefile b/Makefile
index 706ee16..96d550c 100644
--- a/Makefile
+++ b/Makefile
@@ -10,13 +10,14 @@ GIT_HASH := $$(git rev-parse --short HEAD)
 GOBUILD_VERSION_ARGS := -ldflags "-s -X $(VERSION_VAR)=$(REPO_VERSION) -X $(GIT_VAR)=$(GIT_HASH) -X $(BUILD_DATE_VAR)=$(BUILD_DATE)"
 # useful for other docker repos
 DOCKER_REPO ?= jtblin
-CPU_ARCH ?= amd64
+CPU_ARCH ?= arm64
 IMAGE_NAME := $(DOCKER_REPO)/$(BINARY_NAME)-$(CPU_ARCH)
 MANIFEST_NAME := $(DOCKER_REPO)/$(BINARY_NAME)
 ARCH ?= darwin
 GOLANGCI_LINT_VERSION ?= v1.23.8
 GOLANGCI_LINT_CONCURRENCY ?= 4
 GOLANGCI_LINT_DEADLINE ?= 180
+PLATFORMS ?= linux/arm/v7,linux/arm64/v8,linux/amd64
 # useful for passing --build-arg http_proxy :)
 DOCKER_BUILD_FLAGS :=
 
@@ -72,7 +73,8 @@ check-all:
 	golangci-lint run --enable=gocyclo --concurrency=$(GOLANGCI_LINT_CONCURRENCY) --deadline=600s
 
 docker:
-	docker build -t $(IMAGE_NAME):$(GIT_HASH) . $(DOCKER_BUILD_FLAGS)
+	docker buildx create --name multiarch --use
+	docker buildx build --platform $(PLATFORMS) -t $(IMAGE_NAME):$(GIT_HASH) . $(DOCKER_BUILD_FLAGS)
 
 docker-dev: docker
 	docker tag $(IMAGE_NAME):$(GIT_HASH) $(IMAGE_NAME):dev
@@ -87,20 +89,16 @@ ifeq (, $(findstring -rc, $(REPO_VERSION)))
 	docker push $(IMAGE_NAME):latest
 endif
 
-release-manifest:
-	for tag in latest $(REPO_VERSION); do \
-	  for arch in amd64 arm64; do \
-		  docker pull $(MANIFEST_NAME)-$$arch:$$tag; \
-		done; \
-	  docker manifest create $(MANIFEST_NAME):$$tag --amend \
-		  $(MANIFEST_NAME)-amd64:$$tag \
-		  $(MANIFEST_NAME)-arm64:$$tag; \
-	  docker manifest push $(MANIFEST_NAME):$$tag; \
-	done
-
 version:
 	@echo $(REPO_VERSION)
 
+info-release:
+	@echo IMAGE_NAME=$(IMAGE_NAME)
+	@echo GIT_HASH=$(GIT_HASH)
+	@echo REPO_VERSION=$(REPO_VERSION)
+	@echo MANIFEST_NAME=$(MANIFEST_NAME)
+	@echo PLATFORMS=$(PLATFORMS)
+
 clean:
 	rm -rf build/bin/*