Simplify kernel output and main Dockerfile

Signed-off-by: Justin Cormack <justin@specialbusservice.com>

alpine/.dockerignore

@@ -1 +0,0 @@
-packages/docker/docker.git

alpine/Dockerfile

@@ -5,15 +5,18 @@ ENV ARCH=x86_64
 RUN \
   addgroup -g 50 docker && \
   adduser -G docker -u 1001 -s /bin/sh -D -g "Docker" docker && \
-  passwd -d root
+  passwd -d root && \
+  adduser -D -H -s /sbin/nologin dockremap
 
 COPY etc /etc/
-RUN mkdir -p /etc/docker
 
-ADD kernel/$ARCH/aufs-utils.tar /
-COPY kernel/$ARCH/kernel-source-info /etc/
-ADD kernel/$ARCH/kernel-patches.tar /etc/kernel-patches
-ADD kernel/$ARCH/kernel-modules.tar /
+COPY kernel/usr /usr/
+COPY kernel/etc /etc/
+COPY kernel/sbin /sbin/
+COPY kernel/lib /lib/
+
+COPY init /
+COPY mkinitrd.sh /
 
 COPY packages/proxy/usr /usr/
 COPY packages/proxy/sbin /sbin/
@@ -88,15 +91,4 @@ RUN \
   rc-update add azure default && \
   true
 
-COPY init /
-COPY mkinitrd.sh /
-
-RUN adduser -D -H -s /sbin/nologin dockremap
-
-RUN cd /usr/bin && \
-  ln -s docker-runc runc && \
-  ln -s docker-containerd-shim containerd-shim && \
-  ln -s docker-containerd-ctr containerd-ctr && \
-  ln -s docker-containerd containerd
-
 CMD ["/bin/sh"]

alpine/kernel/.gitignore

@@ -1,2 +1,5 @@
-x86_64
-arm
+x86_64/
+etc/
+lib/
+usr/
+sbin/

alpine/kernel/Dockerfile

@@ -66,13 +66,10 @@ RUN if [ $DEBUG -ne "0" ]; then \
 # Apply local patches
 COPY patches /patches
 RUN cd /linux && \
-    mkdir /etc/kernel-patches && \
     set -e && for patch in /patches/*.patch; do \
         echo "Applying $patch"; \
-        cp "$patch" /etc/kernel-patches; \
         patch -p1 < "$patch"; \
-    done && \
-    cd /etc/kernel-patches && tar cf /kernel-patches.tar .
+    done
 
 RUN jobs=$(nproc); \
     cd /linux && \

alpine/kernel/Makefile

@@ -8,21 +8,17 @@ $(ARCH)/mobykernel-build: Dockerfile kernel_config
 	docker build --build-arg DEBUG=$(DEBUG) -t mobykernel:build .
 	touch $@
 
-$(ARCH)/aufs-utils.tar $(ARCH)/kernel-source-info $(ARCH)/kernel-patches.tar $(ARCH)/kernel-modules.tar: $(ARCH)/mobykernel-build
-	docker run --rm mobykernel:build cat /$(notdir $@) > $@ || ! rm $@
-
-$(ARCH)/bzImage $(ARCH)/zImage: $(ARCH)/aufs-utils.tar $(ARCH)/kernel-source-info $(ARCH)/kernel-patches.tar $(ARCH)/kernel-modules.tar $(ARCH)/mobykernel-build
+$(ARCH)/bzImage: $(ARCH)/mobykernel-build
 	docker run --rm mobykernel:build cat /linux/arch/$(ARCH)/boot/$(notdir $@) > $@ || ! rm $@
-
-$(ARCH)/vmlinux: $(ARCH)/bzImage
-	docker run --rm mobykernel:build cat /linux/vmlinux > $@ || ! rm $@
+	docker run --rm --net=none mobykernel:build cat /kernel-modules.tar | tar xf -
+	docker run --rm mobykernel:build cat /aufs-utils.tar | tar xf -
+	docker run --rm mobykernel:build cat /kernel-source-info > etc/kernel-source-info
+	mkdir -p etc
+	cp -a patches etc/kernel-patches
 
 $(ARCH)/vmlinuz64: $(ARCH)/bzImage
 	cp $< $@
 
-clean-arch:
-	rm -rf $(ARCH)
-	docker images -q mobykernel:build | xargs docker rmi -f || true
-
 clean:
-	$(MAKE) clean-arch ARCH=x86_64
+	rm -rf $(ARCH) lib etc usr sbin
+	docker images -q mobykernel:build | xargs docker rmi -f || true

alpine/packages/containerd/etc/init.d/containerd

@@ -13,6 +13,14 @@ start()
 	ulimit -n 1048576
 	ulimit -p unlimited
 
+	[ ! -e /usr/bin/containerd ] && \
+	( cd /usr/bin && \
+	  ln -s docker-runc runc && \
+	  ln -s docker-containerd-shim containerd-shim && \
+	  ln -s docker-containerd-ctr containerd-ctr && \
+	  ln -s docker-containerd containerd \
+	)
+
 	/usr/bin/containerd 1>&2 2>/var/log/containerd.log &
 
 	ewaitfile 5 /var/run/containerd/containerd.sock

alpine/packages/docker/etc/init.d/docker

@@ -41,6 +41,7 @@ start()
 	esac
 
 	# some config is always in /etc/docker cannot specify alternative eg certs
+	mkdir -p /etc/docker
 	if mobyconfig exists etc/docker
 	then
 		for f in $(mobyconfig find etc/docker)