From 85bfa2a615ed94b97ce88c0dc22b20ff11d46c13 Mon Sep 17 00:00:00 2001
From: Ian Fijolek <ian@iamthefij.com>
Date: Fri, 8 Mar 2019 17:12:03 -0800
Subject: [PATCH] Initial

---
 .dockerignore |  2 ++
 .drone.yml    | 18 ++++++++++++++++++
 .gitignore    |  2 ++
 Dockerfile    | 11 +++++++++++
 Makefile      | 33 +++++++++++++++++++++++++++++++++
 get_qemu.sh   | 13 +++++++++++++
 6 files changed, 79 insertions(+)
 create mode 100644 .dockerignore
 create mode 100644 .drone.yml
 create mode 100644 .gitignore
 create mode 100644 Dockerfile
 create mode 100644 Makefile
 create mode 100755 get_qemu.sh

diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..69ab732
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,2 @@
+README.md
+Makefile
diff --git a/.drone.yml b/.drone.yml
new file mode 100644
index 0000000..33ff9e8
--- /dev/null
+++ b/.drone.yml
@@ -0,0 +1,18 @@
+kind: pipeline
+name: amd64
+
+steps:
+  - name: build
+    image: docker
+    commands:
+      - make build
+
+---
+kind: pipeline
+name: arm
+
+steps:
+  - name: build
+    image: docker
+    commands:
+      - make cross-build-arm
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..604a3bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+qemu-*
+*.tar.gz
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..7bac3ef
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,11 @@
+ARG REPO=library
+FROM ${REPO}/python:3-alpine
+
+ARG ARCH=x86_64
+COPY ./build/qemu-${ARCH}-static /usr/bin/
+
+
+RUN echo "OK" > /foo
+
+
+CMD [ "cat", "/foo" ]
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..9a87fe2
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,33 @@
+DOCKER_TAG ?= multiarch-test-${USER}
+
+.PHONY: default
+default: test
+
+.PHONY:test
+test:
+	@echo ok
+
+.PHONY: build
+build: build/qemu-x86_64-static
+	docker build . -t ${DOCKER_TAG}
+
+build/qemu-arm-static:
+	./get_qemu.sh
+
+build/qemu-x86_64-static:
+	./get_qemu.sh
+
+build/qemu-aarch64-static:
+	./get_qemu.sh
+
+.PHONY: cross-build-arm
+cross-build-arm: build/qemu-arm-static
+	docker build --build-arg REPO=arm32v6 --build-arg ARCH=arm . -t ${DOCKER_TAG}-arm32v6
+
+.PHONY: run
+run: build
+	docker run ${DOCKER_TAG}
+
+.PHONY: run
+cross-run-arm: cross-build-arm
+	docker run --rm ${DOCKER_TAG}-arm32v6
diff --git a/get_qemu.sh b/get_qemu.sh
new file mode 100755
index 0000000..c9e0314
--- /dev/null
+++ b/get_qemu.sh
@@ -0,0 +1,13 @@
+#! /bin/bash
+
+HOST_ARCH=x86_64
+VERSION=v2.9.1-1
+
+mkdir -p build
+cd build
+
+for target_arch in aarch64 arm x86_64; do
+  wget -N https://github.com/multiarch/qemu-user-static/releases/download/$VERSION/${HOST_ARCH}_qemu-${target_arch}-static.tar.gz
+  tar -xvf ${HOST_ARCH}_qemu-${target_arch}-static.tar.gz
+  rm ${HOST_ARCH}_qemu-${target_arch}-static.tar.gz
+done