CI: Build .iso (but not -efi.iso) images.

Previously (in #8) building both seemed to timeout or otherwise fall foul of
some sort of infra glitch. Try just building one for now.

This is a first step in trying to actually boot images in CI.

Signed-off-by: Ian Campbell <ijc@docker.com>

.circleci/config.yml

@@ -35,14 +35,17 @@ linuxkit_pkg_build: &linuxkit_pkg_build
 image_build: &image_build
   docker:
     - image: debian:stretch
+  # image builds seem to need a bit more grunt (RAM) than usual. Possibly getting OOM killed, which https://github.com/moby/tool/pull/191 might help.
+  # NB: This will become a paid for feature at some point soon (with plenty of warning), so is not a long term solution.
+  resource_class: large
   steps:
     - run:
         name: Configure $PATH
         command: echo 'export PATH=/workspace/bin:$PATH' >> $BASH_ENV
     - run:
         name: Install packages
         # ca-certificates are needed for attach_workspace (and git over https)
-        command: apt-get update && apt-get install -y ca-certificates curl git make openssh-client
+        command: apt-get update && apt-get install -y ca-certificates curl git make openssh-client strace
     - attach_workspace:
         at: /workspace
     - checkout
@@ -72,10 +75,12 @@ image_build: &image_build
         command: |
           mkdir -p /workspace/images/kube-$KUBE_RUNTIME-$KUBE_NETWORK
           df -h .
-          # KUBE_FORMATS="iso-efi iso-bios" times out or fails for larger docker images.
-          # Just do tar for now.
-          make KUBE_FORMATS="tar" kube-master.iso kube-node.iso
-          #mv kube-master*.iso kube-node*.iso /workspace/images/kube-$KUBE_RUNTIME-$KUBE_NETWORK
+          ulimit -a
+          make LINUXKIT_ARGS="-v" KUBE_FORMATS="iso-bios" kube-master.iso kube-node.iso
+          mv kube-master*.iso kube-node*.iso /workspace/images/kube-$KUBE_RUNTIME-$KUBE_NETWORK
+    - persist_to_workspace:
+        root: /workspace
+        paths: images
 
 version: 2
 jobs:

Makefile

@@ -14,7 +14,8 @@ KUBE_FORMAT_ARGS := $(patsubst %,-format %,$(KUBE_FORMATS))
 all: kube-master.iso kube-node.iso
 
 kube-master.iso: yml/kube.yml yml/$(KUBE_RUNTIME).yml yml/$(KUBE_RUNTIME)-master.yml yml/$(KUBE_NETWORK).yml
-	linuxkit $(LINUXKIT_ARGS) build $(LINUXKIT_BUILD_ARGS) -name kube-master $(KUBE_FORMAT_ARGS) $^
+	# strace logs received signals
+	strace -f -e trace=signal linuxkit $(LINUXKIT_ARGS) build $(LINUXKIT_BUILD_ARGS) -name kube-master $(KUBE_FORMAT_ARGS) $^
 
 kube-node.iso: yml/kube.yml yml/$(KUBE_RUNTIME).yml yml/$(KUBE_NETWORK).yml
 	linuxkit $(LINUXKIT_ARGS) build $(LINUXKIT_BUILD_ARGS) -name kube-node $(KUBE_FORMAT_ARGS) $^