Add a test case for the sysctl package

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

test/cases/040_packages/000_sysctl/test-sysctl.yml

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+kernel:
+  image: "linuxkit/kernel:4.9.x"
+  cmdline: "console=ttyS0 page_poison=1"
+init:
+  - linuxkit/init:cbd7ae748f0a082516501a3e914fa0c924ee941e
+  - linuxkit/runc:24dfe632ed3ff53a026ee3fac046fd544434e2d6
+  - linuxkit/containerd:1c71f95fa36040ea7e987deb98a7a2a363853f01
+  - linuxkit/ca-certificates:4e9a83e890e6477dcd25029fc4f1ced61d0642f4
+onboot:
+  - name: sysctl
+    image: "linuxkit/sysctl:2cf2f9d5b4d314ba1bfc22b2fe931924af666d8c"
+    net: host
+    pid: host
+    ipc: host
+    capabilities:
+     - CAP_SYS_ADMIN
+    readonly: true
+  - name: test
+    image: "linuxkit/test-sysctl:37315a58ec0c18a28be7e2770feb3bf38384492d"
+    net: host
+    pid: host
+  - name: poweroff
+    image: "linuxkit/poweroff:961412b8ef5c5285de0d40ec076701d955eaa084"
+    net: host
+    pid: host
+    command: ["/bin/sh", "/poweroff.sh", "3"]
+    capabilities:
+     - CAP_SYS_BOOT
+    readonly: true
+trust:
+  image:
+    - linuxkit/kernel
+    - linuxkit/binfmt
+    - linuxkit/rngd
+outputs:
+  - format: kernel+initrd

test/cases/040_packages/000_sysctl/test.sh

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+#!/bin/sh
+# SUMMARY: Check that the sysctl config works
+# LABELS:
+# REPEAT:
+# AUTHOR: Justin Cormack <justin.cormack@docker.com>
+
+set -e
+
+# Source libraries. Uncomment if needed/defined
+#. "${RT_LIB}"
+. "${RT_PROJECT_ROOT}/_lib/lib.sh"
+
+clean_up() {
+	find . -iname "test-sysctl*" -not -iname "*.yml" -exec rm -rf {} \;
+}
+trap clean_up EXIT
+
+# Test code goes here
+moby build test-sysctl
+RESULT="$(linuxkit run qemu test-sysctl)"
+echo "${RESULT}" | grep -q "suite PASSED"
+
+exit 0

test/cases/040_packages/group.sh

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+#!/bin/sh
+# SUMMARY: LinuxKit package tests
+# LABELS:
+# For the top level group.sh also specify a 'NAME:' comment
+
+# Source libraries. Uncomment if needed/defined
+#. "${RT_LIB}"
+#. "${RT_PROJECT_ROOT}/_lib/lib.sh"
+
+
+group_init() {
+    # Group initialisation code goes here
+    return 0
+}
+
+group_deinit() {
+    # Group de-initialisation code goes here
+    return 0
+}
+
+CMD=$1
+case $CMD in
+init)
+    group_init
+    res=$?
+    ;;
+deinit)
+    group_deinit
+    res=$?
+    ;;
+*)
+    res=1
+    ;;
+esac
+
+exit $res

test/pkg/sysctl/Dockerfile

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+FROM alpine:edge
+ADD . ./
+ENTRYPOINT ["/bin/sh", "/check.sh"]

test/pkg/sysctl/Makefile

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+.PHONY: tag push
+
+BASE=alpine:3.5
+IMAGE=test-sysctl
+
+default: push
+
+hash: Dockerfile check.sh
+	DOCKER_CONTENT_TRUST=1 docker pull $(BASE)
+	tar cf - $^ | docker build --no-cache -t $(IMAGE):build -
+	docker run --rm --entrypoint=/bin/sh $(IMAGE):build -c "cat $^ /lib/apk/db/installed | sha1sum" | sed 's/ .*//' > hash
+
+push: hash
+	docker pull linuxkit/$(IMAGE):$(shell cat hash) || \
+		(docker tag $(IMAGE):build linuxkit/$(IMAGE):$(shell cat hash) && \
+		 docker push linuxkit/$(IMAGE):$(shell cat hash))
+	docker rmi $(IMAGE):build
+	rm -f hash
+
+tag: hash
+	docker pull linuxkit/$(IMAGE):$(shell cat hash) || \
+		docker tag $(IMAGE):build linuxkit/$(IMAGE):$(shell cat hash)
+	docker rmi $(IMAGE):build
+	rm -f hash
+
+clean:
+	rm -f hash
+
+.DELETE_ON_ERROR:

test/pkg/sysctl/check.sh

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+#!/bin/sh
+
+function failed {
+	printf "sysctl test suite FAILED\n" >&1
+	exit 1
+}
+
+# this is a non default value, so will fail if sysctl failed
+[ "$(sysctl -n fs.inotify.max_user_watches)" -eq 524288 ] || failed
+
+printf "Sysctl test suite PASSED\n" >&1