Add initial multiarchitecture support via Debian cross-compiled binaries

.dockerignore

@@ -1,7 +1,7 @@
 *.md
 *.sh
-*/hello
-*/nanoserver/hello.txt
+**/hello
+**/nanoserver/hello.txt
 .dockerignore
 .git
 Dockerfile*

.travis.yml

@@ -10,8 +10,8 @@ before_script:
 
 script:
   - ./update.sh
-  - test -z "$(git status --porcelain '*/hello' '*/nanoserver/hello.txt')"
-  - travis_retry travis_retry travis_retry docker build -t "$image" hello-world
+  - test -z "$(git status --porcelain '**/hello' '**/nanoserver/hello.txt')"
+  - travis_retry docker build -t "$image" amd64/hello-world
   - ~/official-images/test/run.sh "$image"
 
 after_script:

Dockerfile.build

@@ -1,17 +1,71 @@
 # explicitly use Debian for maximum cross-architecture compatibility
-FROM debian:jessie-slim
+FROM debian:stretch-slim
+
+#RUN dpkg --add-architecture i386
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
 		gcc \
 		libc6-dev \
 		make \
+#		\
+#		gcc-multilib \
+#		libc6-dev-i386 \
+#		linux-libc-dev:i386 \
+		\
+		libc6-dev-arm64-cross \
+		libc6-dev-armel-cross \
+		libc6-dev-armhf-cross \
+		libc6-dev-ppc64el-cross \
+		libc6-dev-s390x-cross \
+		\
+		gcc-aarch64-linux-gnu \
+		gcc-arm-linux-gnueabi \
+		gcc-arm-linux-gnueabihf \
+		gcc-powerpc64le-linux-gnu \
+		gcc-s390x-linux-gnu \
 	&& rm -rf /var/lib/apt/lists/*
 
 WORKDIR /usr/src/hello
 COPY . .
 
 RUN set -ex; \
-	make clean all test; \
-	find \( -name 'hello' -or -name 'hello.txt' \) -exec ls -l '{}' +
+	make clean all test \
+		TARGET_ARCH='amd64' \
+		CC='x86_64-linux-gnu-gcc' \
+		STRIP='x86_64-linux-gnu-strip'
+
+RUN set -ex; \
+	make clean all \
+		TARGET_ARCH='arm32v5' \
+		CC='arm-linux-gnueabi-gcc' \
+		STRIP='arm-linux-gnueabi-strip'
+
+RUN set -ex; \
+	make clean all \
+		TARGET_ARCH='arm32v7' \
+		CC='arm-linux-gnueabihf-gcc' \
+		STRIP='arm-linux-gnueabihf-strip'
+
+RUN set -ex; \
+	make clean all \
+		TARGET_ARCH='arm64v8' \
+		CC='aarch64-linux-gnu-gcc' \
+		STRIP='aarch64-linux-gnu-strip'
+
+# TODO TARGET_ARCH='i386' (heinous package conflicts trying to get "gcc -m32"/"gcc-multilib" to work with all the cross-compiling gccs)
+
+RUN set -ex; \
+	make clean all \
+		TARGET_ARCH='ppc64le' \
+		CC='powerpc64le-linux-gnu-gcc' \
+		STRIP='powerpc64le-linux-gnu-strip'
+
+RUN set -ex; \
+	make clean all \
+		TARGET_ARCH='s390x' \
+		CC='s390x-linux-gnu-gcc' \
+		STRIP='s390x-linux-gnu-strip'
+
+RUN find \( -name 'hello' -or -name 'hello.txt' \) -exec ls -lh '{}' +
 
 CMD ["./hello-world/hello"]

Makefile

@@ -1,16 +1,20 @@
-C_TARGETS := $(addsuffix hello, $(wildcard */))
+TARGET_ARCH := amd64
+C_TARGETS := $(addsuffix hello, $(wildcard $(TARGET_ARCH)/*/))
 
 CC := gcc
 CFLAGS := -static -Os -nostartfiles -fno-asynchronous-unwind-tables
+STRIP := strip
 
 .PHONY: all
 all: $(C_TARGETS)
 
 $(C_TARGETS): hello.c
-	$(CC) $(CFLAGS) -o '$@' -D DOCKER_IMAGE='"$(@D)"' -D DOCKER_GREETING="\"$$(cat '$(@D)/greeting.txt')\"" '$<'
-	strip -R .comment -s '$@'
-	@mkdir -p '$(@D)/nanoserver'
-	'$@' | sed -e 's/an Ubuntu container/a Nano Server container/g' -e 's!ubuntu bash!microsoft/nanoserver powershell!g' > '$(@D)/nanoserver/hello.txt'
+	$(CC) $(CFLAGS) -o '$@' -D DOCKER_IMAGE='"$(notdir $(@D))"' -D DOCKER_GREETING="\"$$(cat 'greetings/$(notdir $(@D)).txt')\"" '$<'
+	$(STRIP) -R .comment -s '$@'
+	@if [ '$(TARGET_ARCH)' = 'amd64' ]; then \
+		mkdir -p '$(@D)/nanoserver'; \
+		'$@' | sed -e 's/an Ubuntu container/a Nano Server container/g' -e 's!ubuntu bash!microsoft/nanoserver powershell!g' > '$(@D)/nanoserver/hello.txt'; \
+	fi
 
 .PHONY: clean
 clean:
@@ -20,5 +24,5 @@ clean:
 test: $(C_TARGETS)
 	@for b in $^; do \
 		( set -x && "./$$b" ); \
-		( set -x && "./$$b" | grep -q '"'"$$(dirname "$$b")"'"' ); \
+		( set -x && "./$$b" | grep -q '"'"$$(basename "$$(dirname "$$b")")"'"' ); \
 	done

arm32v5/hello-seattle/Dockerfile

@@ -0,0 +1,3 @@
+FROM scratch
+COPY hello /
+CMD ["/hello"]

arm32v5/hello-world/Dockerfile

@@ -0,0 +1,3 @@
+FROM scratch
+COPY hello /
+CMD ["/hello"]

arm32v5/hola-mundo/Dockerfile

@@ -0,0 +1,3 @@
+FROM scratch
+COPY hello /
+CMD ["/hello"]

arm32v7/hello-seattle/Dockerfile

@@ -0,0 +1,3 @@
+FROM scratch
+COPY hello /
+CMD ["/hello"]

arm32v7/hello-world/Dockerfile

@@ -0,0 +1,3 @@
+FROM scratch
+COPY hello /
+CMD ["/hello"]

arm32v7/hola-mundo/Dockerfile

@@ -0,0 +1,3 @@
+FROM scratch
+COPY hello /
+CMD ["/hello"]

arm64v8/hello-seattle/Dockerfile

@@ -0,0 +1,3 @@
+FROM scratch
+COPY hello /
+CMD ["/hello"]

arm64v8/hello-world/Dockerfile

@@ -0,0 +1,3 @@
+FROM scratch
+COPY hello /
+CMD ["/hello"]

arm64v8/hola-mundo/Dockerfile

@@ -0,0 +1,3 @@
+FROM scratch
+COPY hello /
+CMD ["/hello"]

generate-stackbrew-library.sh

@@ -28,31 +28,56 @@ dirCommit() {
 	)
 }
 
+generateCommit="$(fileCommit "$self")"
 cat <<-EOH
-# this file is generated via https://github.com/docker-library/hello-world/blob/$(fileCommit "$self")/$self
+# this file is generated via https://github.com/docker-library/hello-world/blob/$generateCommit/$self
 
 Maintainers: Tianon Gravi <admwiggin@gmail.com> (@tianon),
              Joseph Ferguson <yosifkit@gmail.com> (@yosifkit)
 GitRepo: https://github.com/docker-library/hello-world.git
+GitCommit: $generateCommit
 EOH
 
-commit="$(dirCommit "$image")"
+# prints "$2$1$3$1...$N"
+join() {
+	local sep="$1"; shift
+	local out; printf -v out "${sep//%/%%}%s" "$@"
+	echo "${out#$sep}"
+}
+
+arches=( *"/$image/hello" )
+arches=( "${arches[@]%"/$image/hello"}" )
 
 echo
 cat <<-EOE
 	Tags: latest
-	GitCommit: $commit
-	Directory: $image
+	Architectures: $(join ', ' "${arches[@]}")
 EOE
+for arch in "${arches[@]}"; do
+	commit="$(dirCommit "$arch/$image")"
+	cat <<-EOE
+		$arch-GitCommit: $commit
+		$arch-Directory: $arch/$image
+	EOE
+done
 
-if [ -d "$image/nanoserver" ]; then
-	commit="$(dirCommit "$image/nanoserver")"
+winArches=( *"/$image/nanoserver/hello.txt" )
+winArches=( "${winArches[@]%"/$image/nanoserver/hello.txt"}" )
 
+if [ "${#winArches[@]}" -gt 0 ]; then
 	echo
 	cat <<-EOE
 		Tags: nanoserver
-		GitCommit: $commit
-		Directory: $image/nanoserver
+		Architectures: $(join ', ' "${winArches[@]/#/windows-}")
+	EOE
+	for arch in "${winArches[@]}"; do
+		commit="$(dirCommit "$arch/$image/nanoserver")"
+		cat <<-EOE
+			windows-$arch-GitCommit: $commit
+			windows-$arch-Directory: $arch/$image/nanoserver
+		EOE
+	done
+	cat <<-EOE
 		Constraints: nanoserver
 	EOE
 fi

i386/hello-seattle/Dockerfile

@@ -0,0 +1,3 @@
+FROM scratch
+COPY hello /
+CMD ["/hello"]

i386/hello-world/Dockerfile

@@ -0,0 +1,3 @@
+FROM scratch
+COPY hello /
+CMD ["/hello"]

i386/hola-mundo/Dockerfile

@@ -0,0 +1,3 @@
+FROM scratch
+COPY hello /
+CMD ["/hello"]

ppc64le/hello-seattle/Dockerfile

@@ -0,0 +1,3 @@
+FROM scratch
+COPY hello /
+CMD ["/hello"]

ppc64le/hello-world/Dockerfile

@@ -0,0 +1,3 @@
+FROM scratch
+COPY hello /
+CMD ["/hello"]

ppc64le/hola-mundo/Dockerfile

@@ -0,0 +1,3 @@
+FROM scratch
+COPY hello /
+CMD ["/hello"]

s390x/hello-seattle/Dockerfile

@@ -0,0 +1,3 @@
+FROM scratch
+COPY hello /
+CMD ["/hello"]

s390x/hello-world/Dockerfile

@@ -0,0 +1,3 @@
+FROM scratch
+COPY hello /
+CMD ["/hello"]

s390x/hola-mundo/Dockerfile

@@ -0,0 +1,3 @@
+FROM scratch
+COPY hello /
+CMD ["/hello"]

update.sh

@@ -10,10 +10,11 @@ docker build -f Dockerfile.build -t hello-world:build .
 rm -rf */hello */nanoserver/hello.txt
 docker run --rm hello-world:build sh -c 'find \( -name hello -or -name hello.txt \) -print0 | xargs -0 tar --create' | tar --extract --verbose
 
-for h in */hello; do
+for h in amd64/*/hello; do
 	d="$(dirname "$h")"
+	b="$(basename "$d")"
 	"$h" > /dev/null
-	docker build -t hello-world:"test-$d" "$d"
-	docker run --rm hello-world:"test-$d"
+	docker build -t hello-world:"test-$b" "$d"
+	docker run --rm hello-world:"test-$b"
 done
-ls -l */nanoserver/hello.txt || :
+ls -lh */*/{hello,nanoserver/hello.txt} || :