Add arm and ppc64le support

controllers/nginx/Makefile

@@ -3,8 +3,8 @@ all: push
 BUILDTAGS=
 
 # Use the 0.0 tag for testing, it shouldn't clobber any release builds
-RELEASE?=0.9.0-beta.8
-PREFIX?=gcr.io/google_containers/nginx-ingress-controller
+TAG?=0.9.0-beta.8
+REGISTRY?=gcr.io/google_containers
 GOOS?=linux
 DOCKER?=gcloud docker --
 
@@ -16,16 +16,91 @@ endif
 
 PKG=k8s.io/ingress/controllers/nginx
 
-build: clean
-	CGO_ENABLED=0 GOOS=${GOOS} go build -a -installsuffix cgo \
-		-ldflags "-s -w -X ${PKG}/pkg/version.RELEASE=${RELEASE} -X ${PKG}/pkg/version.COMMIT=${COMMIT} -X ${PKG}/pkg/version.REPO=${REPO_INFO}" \
-		-o rootfs/nginx-ingress-controller ${PKG}/pkg/cmd/controller
+ARCH ?= $(shell go env GOARCH)
+GOARCH = ${ARCH}
+DUMB_ARCH = ${ARCH}
+
+ALL_ARCH = amd64 arm ppc64le
+
+QEMUVERSION=v2.7.0
+
+IMGNAME = nginx-ingress-controller
+IMAGE = $(REGISTRY)/$(IMGNAME)
+MULTI_ARCH_IMG = $(IMAGE)-$(ARCH)
+
+# Set default base image dynamically for each arch
+BASEIMAGE?=gcr.io/google_containers/nginx-slim-$(ARCH):0.20
+
+ifeq ($(ARCH),arm)
+    QEMUARCH=arm
+	GOARCH=arm
+	DUMB_ARCH=armhf
+endif
+#ifeq ($(ARCH),arm64)
+#        QEMUARCH=aarch64
+#endif
+ifeq ($(ARCH),ppc64le)
+	QEMUARCH=ppc64le
+	GOARCH=ppc64le
+	DUMB_ARCH=ppc64el
+endif
+#ifeq ($(ARCH),s390x)
+#        QEMUARCH=s390x
+#endif
+
+TEMP_DIR := $(shell mktemp -d)
+
+all: all-container
+
+sub-container-%:
+	$(MAKE) ARCH=$* build container
+
+sub-push-%:
+	$(MAKE) ARCH=$* push
 
-container: build
-	$(DOCKER) build --pull -t $(PREFIX):$(RELEASE) rootfs
+all-container: $(addprefix sub-container-,$(ALL_ARCH))
 
-push: container
-	$(DOCKER) push $(PREFIX):$(RELEASE)
+all-push: $(addprefix sub-push-,$(ALL_ARCH))
+
+container: .container-$(ARCH)
+.container-$(ARCH):
+	cp -r ./* $(TEMP_DIR)
+	cd $(TEMP_DIR) && sed -i 's|BASEIMAGE|$(BASEIMAGE)|g' rootfs/Dockerfile
+	cd $(TEMP_DIR) && sed -i "s|QEMUARCH|$(QEMUARCH)|g" rootfs/Dockerfile
+	cd $(TEMP_DIR) && sed -i "s|DUMB_ARCH|$(DUMB_ARCH)|g" rootfs/Dockerfile
+
+ifeq ($(ARCH),amd64)
+	# When building "normally" for amd64, remove the whole line, it has no part in the amd64 image
+	cd $(TEMP_DIR) && sed -i "/CROSS_BUILD_/d" rootfs/Dockerfile
+else
+	# When cross-building, only the placeholder "CROSS_BUILD_" should be removed
+	# Register /usr/bin/qemu-ARCH-static as the handler for ARM binaries in the kernel
+	$(DOCKER) run --rm --privileged multiarch/qemu-user-static:register --reset
+	curl -sSL https://github.com/multiarch/qemu-user-static/releases/download/$(QEMUVERSION)/x86_64_qemu-$(QEMUARCH)-static.tar.gz | tar -xz -C $(TEMP_DIR)/rootfs
+	cd $(TEMP_DIR) && sed -i "s/CROSS_BUILD_//g" rootfs/Dockerfile
+endif
+
+	$(DOCKER) build -t $(MULTI_ARCH_IMG):$(TAG) $(TEMP_DIR)/rootfs
+
+ifeq ($(ARCH), amd64)
+	# This is for to maintain the backward compatibility
+	$(DOCKER) tag $(MULTI_ARCH_IMG):$(TAG) $(IMAGE):$(TAG)
+endif
+
+push: .push-$(ARCH)
+.push-$(ARCH): .container-$(ARCH)
+	$(DOCKER) push $(MULTI_ARCH_IMG):$(TAG)
+ifeq ($(ARCH), amd64)
+	$(DOCKER) push $(IMAGE):$(TAG)
+endif
+
+clean: 
+	$(DOCKER) rmi -f $(MULTI_ARCH_IMG):$(TAG) || true
+
+build: clean
+	CGO_ENABLED=0 GOOS=${GOOS} GOARCH=${GOARCH} go build -a -installsuffix cgo \
+		-ldflags "-s -w -X ${PKG}/pkg/version.RELEASE=${TAG} -X ${PKG}/pkg/version.COMMIT=${COMMIT} -X ${PKG}/pkg/version.REPO=${REPO_INFO}" \
+		-o $(TEMP_DIR)/rootfs/nginx-ingress-controller ${PKG}/pkg/cmd/controller
 
 fmt:
 	@echo "+ $@"
@@ -48,6 +123,3 @@ cover:
 vet:
 	@echo "+ $@"
 	@go vet $(shell go list ${PKG}/... | grep -v vendor)
-
-clean:
-	rm -f rootfs/nginx-ingress-controller

controllers/nginx/rootfs/Dockerfile

@@ -12,17 +12,20 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM gcr.io/google_containers/nginx-slim-amd64:0.19
+FROM BASEIMAGE
+
+CROSS_BUILD_COPY qemu-QEMUARCH-static /usr/bin/
 
 RUN DEBIAN_FRONTEND=noninteractive apt-get update && apt-get install -y \
   diffutils \
   --no-install-recommends \
   && rm -rf /var/lib/apt/lists/*
 
-RUN curl -sSL -o /sbin/tini https://github.com/krallin/tini/releases/download/v0.14.0/tini-amd64 && \
-  chmod +x /sbin/tini
+RUN curl -sSL -o /tmp/dumb-init.deb http://ftp.us.debian.org/debian/pool/main/d/dumb-init/dumb-init_1.2.0-1_DUMB_ARCH.deb && \
+  dpkg -i /tmp/dumb-init.deb && \
+  rm /tmp/dumb-init.deb
 
-ENTRYPOINT ["/sbin/tini", "--"]
+ENTRYPOINT ["/usr/bin/dumb-init", "-v"]
 
 COPY . /