tests: Add a test for the binfmt package

Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>

test/cases/040_packages/002_binfmt/check.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+function failed {
+	printf "binfmt test suite FAILED\n" >&1
+	exit 1
+}
+
+[ -e /binfmt_misc/qemu-aarch64 ] || failed
+[ -e /binfmt_misc/qemu-arm ]     || failed
+[ -e /binfmt_misc/qemu-ppc64le ] || failed
+
+printf "binfmt test suite PASSED\n" >&1

test/cases/040_packages/002_binfmt/test-binfmt.yml

@@ -0,0 +1,28 @@
+kernel:
+  image: "linuxkit/kernel:4.9.x"
+  cmdline: "console=ttyS0 page_poison=1"
+init:
+  - linuxkit/init:4fc8aa82ab34d62d510575c8fbe0c58b7ba9c480
+  - linuxkit/runc:3a4e6cbf15470f62501b019b55e1caac5ee7689f
+  - linuxkit/containerd:b1766e4c4c09f63ac4925a6e4612852a93f7e73b
+onboot:
+  - name: binfmt
+    image: "linuxkit/binfmt:eb3977596d5fc9e847eee1d34cb3beb3f574cac9"
+  - name: test
+    image: "alpine:3.6"
+    readonly: true
+    binds:
+      - /check.sh:/check.sh
+      - /proc/sys/fs/binfmt_misc:/binfmt_misc
+    command: ["sh", "./check.sh"]
+  - name: poweroff
+    image: "linuxkit/poweroff:a8f1e4ad8d459f1fdaad9e4b007512cb3b504ae8"
+    command: ["/bin/sh", "/poweroff.sh", "10"]
+files:
+  - path: check.sh
+    source: ./check.sh
+trust:
+  org:
+    - linuxkit
+  image:
+    - alpine:3.6

test/cases/040_packages/002_binfmt/test.sh

@@ -0,0 +1,24 @@
+#!/bin/sh
+# SUMMARY: Check that the binfmt package works
+# LABELS:
+# REPEAT:
+
+set -e
+set -v
+
+# Source libraries. Uncomment if needed/defined
+#. "${RT_LIB}"
+. "${RT_PROJECT_ROOT}/_lib/lib.sh"
+
+clean_up() {
+	find . -iname "test-binfmt*" -not -iname "*.yml" -exec rm -rf {} \;
+}
+trap clean_up EXIT
+
+# Test code goes here
+moby build -output kernel+initrd test-binfmt
+RESULT="$(linuxkit run qemu -kernel test-binfmt)"
+echo "${RESULT}"
+echo "${RESULT}" | grep -q "suite PASSED"
+
+exit 0