Add initial support for Docker on ARM

Signed-off-by: Govinda Fichtner <govinda.fichtner@googlemail.com>

ARM.md

@@ -0,0 +1,42 @@
+# ARM support
+
+The ARM support should be considered experimental. It will be extended step by step in the coming weeks.
+
+Building a Docker Development Image works in the same fashion as for Intel platform (x86-64).
+Currently we have initial support for 32bit ARMv7 devices.
+
+To work with the Docker Development Image you have to clone the Docker/Docker repo on a supported device.
+It needs to have a Docker Engine installed to build the Docker Development Image.
+
+From the root of the Docker/Docker repo one can use make to execute the following make targets:
+- make validate
+- make binary
+- make build
+- make bundles
+- make default
+- make shell
+- make
+
+The Makefile does include logic to determine on which OS and architecture the Docker Development Image is built.
+Based on OS and architecture it chooses the correct Dockerfile.
+For the ARM 32bit architecture it uses `Dockerfile.arm`.
+
+So for example in order to build a Docker binary one has to  
+1. clone the Docker/Docker repository on an ARM device `git clone git@github.com:docker/docker.git`  
+2. change into the checked out repository with `cd docker`  
+3. execute `make binary` to create a Docker Engine binary for ARM  
+
+# Supported devices
+
+## Scaleway Server C1
+A Scaleway C1 server can be easily purchased on demand on the Scaleway website:
+
+https://www.scaleway.com
+
+It is a cheap and fast way to get access to a pysical ARM server.
+It features a 4-cores ARMv7 CPU with 2GB of RAM and a 1 Gbit/s network card.
+
+Scaleway servers can be started we prepared images from their image hub.
+The best image to build a Docker Development Image is:
+
+https://www.scaleway.com/imagehub/docker/

Dockerfile.arm

@@ -0,0 +1,188 @@
+# This file describes the standard way to build Docker on ARM, using docker
+#
+# Usage:
+#
+# # Assemble the full dev environment. This is slow the first time.
+# docker build -t docker -f Dockerfile.arm .
+#
+# # Mount your source in an interactive container for quick testing:
+# docker run -v `pwd`:/go/src/github.com/docker/docker --privileged -i -t docker bash
+#
+# # Run the test suite:
+# docker run --privileged docker hack/make.sh test
+#
+# # Publish a release:
+# docker run --privileged \
+#  -e AWS_S3_BUCKET=baz \
+#  -e AWS_ACCESS_KEY=foo \
+#  -e AWS_SECRET_KEY=bar \
+#  -e GPG_PASSPHRASE=gloubiboulga \
+#  docker hack/release.sh
+#
+# Note: AppArmor used to mess with privileged mode, but this is no longer
+# the case. Therefore, you don't have to disable it anymore.
+#
+
+FROM ioft/armhf-ubuntu:14.04
+MAINTAINER Govinda Fichtner <govinda.fichtner@googlemail.com> (@_beagile_)
+
+# Packaged dependencies
+RUN apt-get update && apt-get install -y \
+	apparmor \
+	aufs-tools \
+	automake \
+	bash-completion \
+	btrfs-tools \
+	build-essential \
+	createrepo \
+	curl \
+	dpkg-sig \
+	git \
+	iptables \
+	libapparmor-dev \
+	libcap-dev \
+	libsqlite3-dev \
+	libsystemd-journal-dev \
+	mercurial \
+	parallel \
+	pkg-config \
+	python-mock \
+	python-pip \
+	python-websocket \
+	s3cmd=1.1.0* \
+	--no-install-recommends
+
+# Get lvm2 source for compiling statically
+RUN git clone -b v2_02_103 https://git.fedorahosted.org/git/lvm2.git /usr/local/lvm2
+# see https://git.fedorahosted.org/cgit/lvm2.git/refs/tags for release tags
+
+# Compile and install lvm2
+RUN cd /usr/local/lvm2 \
+	&& ./configure --enable-static_link \
+	&& make device-mapper \
+	&& make install_device-mapper
+# see https://git.fedorahosted.org/cgit/lvm2.git/tree/INSTALL
+
+# Install Go
+ENV GO_VERSION 1.4.3
+RUN curl -sSL https://golang.org/dl/go${GO_VERSION}.src.tar.gz | tar -v -C /usr/local -xz \
+	&& mkdir -p /go/bin
+ENV PATH /go/bin:/usr/local/go/bin:$PATH
+ENV GOPATH /go:/go/src/github.com/docker/docker/vendor
+# (set an explicit GOARM of 5 for maximum compatibility)
+ENV GOARM 5
+RUN cd /usr/local/go/src && ./make.bash --no-clean 2>&1
+
+# Compile Go for cross compilation
+ENV DOCKER_CROSSPLATFORMS " "
+
+# This has been commented out and kept as reference because we don't support compiling with older Go anymore.
+# ENV GOFMT_VERSION 1.3.3
+# RUN curl -sSL https://storage.googleapis.com/golang/go${GOFMT_VERSION}.$(go env GOOS)-$(go env GOARCH).tar.gz | tar -C /go/bin -xz --strip-components=2 go/bin/gofmt
+
+# Update this sha when we upgrade to go 1.5.0
+ENV GO_TOOLS_COMMIT 069d2f3bcb68257b627205f0486d6cc69a231ff9
+# Grab Go's cover tool for dead-simple code coverage testing
+# Grab Go's vet tool for examining go code to find suspicious constructs
+# and help prevent errors that the compiler might not catch
+RUN git clone https://github.com/golang/tools.git /go/src/golang.org/x/tools \
+	&& (cd /go/src/golang.org/x/tools && git checkout -q $GO_TOOLS_COMMIT) \
+	&& go install -v golang.org/x/tools/cmd/cover \
+	&& go install -v golang.org/x/tools/cmd/vet
+# Grab Go's lint tool
+ENV GO_LINT_COMMIT f42f5c1c440621302702cb0741e9d2ca547ae80f
+RUN git clone https://github.com/golang/lint.git /go/src/github.com/golang/lint \
+	&& (cd /go/src/github.com/golang/lint && git checkout -q $GO_LINT_COMMIT) \
+	&& go install -v github.com/golang/lint/golint
+
+# Install registry
+ENV REGISTRY_COMMIT ec87e9b6971d831f0eff752ddb54fb64693e51cd
+RUN set -x \
+	&& export GOPATH="$(mktemp -d)" \
+	&& git clone https://github.com/docker/distribution.git "$GOPATH/src/github.com/docker/distribution" \
+	&& (cd "$GOPATH/src/github.com/docker/distribution" && git checkout -q "$REGISTRY_COMMIT") \
+	&& GOPATH="$GOPATH/src/github.com/docker/distribution/Godeps/_workspace:$GOPATH" \
+		go build -o /usr/local/bin/registry-v2 github.com/docker/distribution/cmd/registry \
+	&& rm -rf "$GOPATH"
+
+# Install notary server
+# commented Notary temporary as we are waiting for an update of jose2go: https://github.com/docker/notary/issues/239
+#
+# ENV NOTARY_COMMIT 8e8122eb5528f621afcd4e2854c47302f17392f7
+# RUN set -x \
+# 	&& export GOPATH="$(mktemp -d)" \
+# 	&& git clone https://github.com/docker/notary.git "$GOPATH/src/github.com/docker/notary" \
+# 	&& (cd "$GOPATH/src/github.com/docker/notary" && git checkout -q "$NOTARY_COMMIT") \
+# 	&& GOPATH="$GOPATH/src/github.com/docker/notary/Godeps/_workspace:$GOPATH" \
+# 		go build -o /usr/local/bin/notary-server github.com/docker/notary/cmd/notary-server \
+# 	&& rm -rf "$GOPATH"
+
+# Get the "docker-py" source so we can run their integration tests
+ENV DOCKER_PY_COMMIT 139850f3f3b17357bab5ba3edfb745fb14043764
+RUN git clone https://github.com/docker/docker-py.git /docker-py \
+	&& cd /docker-py \
+	&& git checkout -q $DOCKER_PY_COMMIT
+
+# Setup s3cmd config
+RUN { \
+		echo '[default]'; \
+		echo 'access_key=$AWS_ACCESS_KEY'; \
+		echo 'secret_key=$AWS_SECRET_KEY'; \
+	} > ~/.s3cfg
+
+# Set user.email so crosbymichael's in-container merge commits go smoothly
+RUN git config --global user.email 'docker-dummy@example.com'
+
+# Add an unprivileged user to be used for tests which need it
+RUN groupadd -r docker
+RUN useradd --create-home --gid docker unprivilegeduser
+
+VOLUME /var/lib/docker
+WORKDIR /go/src/github.com/docker/docker
+ENV DOCKER_BUILDTAGS apparmor selinux
+
+# Let us use a .bashrc file
+RUN ln -sfv $PWD/.bashrc ~/.bashrc
+
+# Register Docker's bash completion.
+RUN ln -sv $PWD/contrib/completion/bash/docker /etc/bash_completion.d/docker
+
+# Get useful and necessary Hub images so we can "docker load" locally instead of pulling
+COPY contrib/download-frozen-image.sh /go/src/github.com/docker/docker/contrib/
+RUN ./contrib/download-frozen-image.sh /docker-frozen-images \
+  hypriot/armhf-busybox@ea0800bb83571c585c5652b53668e76b29c7c0eef719892f9d0a48607984f9e1 \
+  hypriot/armhf-hello-world@508c59a4f8b23c77bbcf43296c3f580873dc7eecb1f0d680cea3067e221fd4c2 \
+  hypriot/armhf-unshare@3f1db65f8bbabc743fd739cf7145a56c35b2a0979ae3174e9d79b7fa4b00fca1
+# see also "hack/make/.ensure-frozen-images" (which needs to be updated any time this list is)
+
+# Download man page generator
+RUN set -x \
+	&& export GOPATH="$(mktemp -d)" \
+	&& git clone -b v1.0.3 https://github.com/cpuguy83/go-md2man.git "$GOPATH/src/github.com/cpuguy83/go-md2man" \
+	&& git clone -b v1.2 https://github.com/russross/blackfriday.git "$GOPATH/src/github.com/russross/blackfriday" \
+	&& go get -v -d github.com/cpuguy83/go-md2man \
+	&& go build -v -o /usr/local/bin/go-md2man github.com/cpuguy83/go-md2man \
+	&& rm -rf "$GOPATH"
+
+# Download toml validator
+ENV TOMLV_COMMIT 9baf8a8a9f2ed20a8e54160840c492f937eeaf9a
+RUN set -x \
+	&& export GOPATH="$(mktemp -d)" \
+	&& git clone https://github.com/BurntSushi/toml.git "$GOPATH/src/github.com/BurntSushi/toml" \
+	&& (cd "$GOPATH/src/github.com/BurntSushi/toml" && git checkout -q "$TOMLV_COMMIT") \
+	&& go build -v -o /usr/local/bin/tomlv github.com/BurntSushi/toml/cmd/tomlv \
+	&& rm -rf "$GOPATH"
+
+# Build/install the tool for embedding resources in Windows binaries
+ENV RSRC_COMMIT e48dbf1b7fc464a9e85fcec450dddf80816b76e0
+RUN set -x \
+    && git clone https://github.com/akavel/rsrc.git /go/src/github.com/akavel/rsrc \
+    && cd /go/src/github.com/akavel/rsrc \
+    && git checkout -q $RSRC_COMMIT \
+    && go install -v
+
+# Wrap all commands in the "docker-in-docker" script to allow nested containers
+ENTRYPOINT ["hack/dind"]
+
+# Upload docker source
+COPY . /go/src/github.com/docker/docker

Makefile

@@ -1,5 +1,20 @@
 .PHONY: all binary build cross default docs docs-build docs-shell shell test test-unit test-integration-cli test-docker-py validate
 
+# get OS/Arch of docker engine
+DOCKER_ENGINE_OSARCH = $(shell docker version | grep 'OS/Arch' | tail -1 | cut -d':' -f2 | tr -d '[[:space:]]')
+DOCKER_ENGINE_GOOS = $(word 1, $(subst /, ,$(DOCKER_ENGINE_OSARCH)))
+DOCKER_ENGINE_GOARCH = $(word 2, $(subst /, ,$(DOCKER_ENGINE_OSARCH)))
+export DOCKER_ENGINE_OSARCH
+export DOCKER_ENGINE_GOOS
+export DOCKER_ENGINE_GOARCH
+# default for linux/amd64 and others
+DOCKER_FILE = Dockerfile
+# switch to different Dockerfile for linux/arm
+ifeq ($(DOCKER_ENGINE_OSARCH),linux/arm)
+  DOCKER_FILE = Dockerfile.arm
+endif
+export DOCKER_FILE
+
 # env vars passed through directly to Docker's build scripts
 # to allow things like `make DOCKER_CLIENTONLY=1 binary` easily
 # `docs/sources/contributing/devenvironment.md ` and `project/PACKAGERS.md` have some limited documentation of some of these
@@ -13,6 +28,10 @@ DOCKER_ENVS := \
 	-e DOCKER_GRAPHDRIVER \
 	-e DOCKER_STORAGE_OPTS \
 	-e DOCKER_USERLANDPROXY \
+	-e DOCKER_ENGINE_OSARCH \
+	-e DOCKER_ENGINE_GOOS \
+	-e DOCKER_ENGINE_GOARCH \
+	-e DOCKER_FILE \
 	-e TESTDIRS \
 	-e TESTFLAGS \
 	-e TIMEOUT
@@ -77,7 +96,7 @@ shell: build
 	$(DOCKER_RUN_DOCKER) bash
 
 build: bundles
-	docker build -t "$(DOCKER_IMAGE)" .
+	docker build -t "$(DOCKER_IMAGE)" -f $(DOCKER_FILE) .
 
 bundles:
 	mkdir bundles

hack/.vendor-helpers.sh

@@ -62,7 +62,7 @@ _dockerfile_env() {
 			print;
 			exit;
 		}
-	' Dockerfile
+	' ${DOCKER_FILE:="Dockerfile"}
 }
 
 clean() {
@@ -71,7 +71,7 @@ clean() {
 		"${PROJECT}/dockerinit" # package main
 		"${PROJECT}/integration-cli" # external tests
 	)
-	local dockerPlatforms=( linux/amd64 $(_dockerfile_env DOCKER_CROSSPLATFORMS) )
+	local dockerPlatforms=( ${DOCKER_ENGINE_OSARCH:="linux/amd64"} $(_dockerfile_env DOCKER_CROSSPLATFORMS) )
 	local dockerBuildTags="$(_dockerfile_env DOCKER_BUILDTAGS)"
 	local buildTagCombos=(
 		''

hack/make/.ensure-frozen-images

@@ -8,6 +8,15 @@ images=(
 	jess/unshare:latest
 )
 
+# on ARM we need images that work for the ARM architecture
+if [ -v DOCKER_ENGINE_OSARCH ] && [ "$DOCKER_ENGINE_OSARCH" = "linux/arm" ]; then
+  images=(
+    hypriot/armhf-busybox@ea0800bb83571c585c5652b53668e76b29c7c0eef719892f9d0a48607984f9e1
+    hypriot/armhf-hello-world@508c59a4f8b23c77bbcf43296c3f580873dc7eecb1f0d680cea3067e221fd4c2
+    hypriot/armhf-unshare@3f1db65f8bbabc743fd739cf7145a56c35b2a0979ae3174e9d79b7fa4b00fca1
+  )
+fi
+
 if ! docker inspect "${images[@]}" &> /dev/null; then
 	hardCodedDir='/docker-frozen-images'
 	if [ -d "$hardCodedDir" ]; then
@@ -32,7 +41,19 @@ if ! docker inspect "${images[@]}" &> /dev/null; then
 					inCont = 0;
 				}
 			}
-		' Dockerfile | sh -x
+		' ${DOCKER_FILE:="Dockerfile"} | sh -x
 		( set -x; tar -cC "$dir" . | docker load )
 	fi
 fi
+
+if [ -v DOCKER_ENGINE_OSARCH ] && [ "$DOCKER_ENGINE_OSARCH" = "linux/arm" ]; then
+  # tag images to ensure that all integrations work with the defined image names
+  docker tag hypriot/armhf-busybox:latest busybox:latest
+  docker tag hypriot/armhf-hello-world:latest hello-world:frozen
+  docker tag hypriot/armhf-unshare:latest jess/unshare:latest
+
+  # remove orignal tags as these make problems with later tests: TestInspectApiImageResponse
+  docker rmi hypriot/armhf-busybox:latest
+  docker rmi hypriot/armhf-hello-world:latest
+  docker rmi hypriot/armhf-unshare:latest
+fi

hack/make/.ensure-httpserver

@@ -8,7 +8,7 @@ dir="$DEST/httpserver"
 mkdir -p "$dir"
 (
 	cd "$dir"
-	GOOS=linux GOARCH=amd64 go build -o httpserver github.com/docker/docker/contrib/httpserver
+	GOOS=${DOCKER_ENGINE_GOOS:="linux"} GOARCH=${DOCKER_ENGINE_GOARCH:="amd64"} go build -o httpserver github.com/docker/docker/contrib/httpserver
 	cp ../../../../contrib/httpserver/Dockerfile .
 	docker build -qt httpserver . > /dev/null
 )