tests: Add k8s-volume test

This imports the k8s-volume test from the tests repo and modifies it
slightly to set up the host volume on the AKS host.

Fixes: #6566

Signed-off-by: Aurélien Bombo <abombo@microsoft.com>

tests/integration/kubernetes/k8s-volume.bats

@@ -0,0 +1,67 @@
+#!/usr/bin/env bats
+#
+# Copyright (c) 2018 Intel Corporation
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+load "${BATS_TEST_DIRNAME}/../../common.bash"
+load "${BATS_TEST_DIRNAME}/tests_common.sh"
+TEST_INITRD="${TEST_INITRD:-no}"
+
+setup() {
+	[ "${KATA_HYPERVISOR}" == "firecracker" ] && skip "test not working see: ${fc_limitations}"
+
+	get_pod_config_dir
+
+	tmp_file=$(exec_host mktemp -d /tmp/data.XXXX)
+	pod_yaml=$(mktemp --tmpdir pod_config.XXXXXX.yaml)
+	msg="Hello from Kubernetes"
+	exec_host "echo $msg > $tmp_file/index.html"
+	pod_name="pv-pod"
+	# Define temporary file at yaml
+	sed -e "s|tmp_data|${tmp_file}|g" ${pod_config_dir}/pv-volume.yaml > "$pod_yaml"
+}
+
+@test "Create Persistent Volume" {
+	[ "${KATA_HYPERVISOR}" == "firecracker" ] && skip "test not working see: ${fc_limitations}"
+
+	volume_name="pv-volume"
+	volume_claim="pv-claim"
+
+	# Create the persistent volume
+	kubectl create -f "$pod_yaml"
+
+	# Check the persistent volume is Available
+	cmd="kubectl get pv $volume_name | grep Available"
+	waitForProcess "$wait_time" "$sleep_time" "$cmd"
+
+	# Create the persistent volume claim
+	kubectl create -f "${pod_config_dir}/volume-claim.yaml"
+
+	# Check the persistent volume claim is Bound.
+	cmd="kubectl get pvc $volume_claim | grep Bound"
+	waitForProcess "$wait_time" "$sleep_time" "$cmd"
+
+	# Create pod
+	kubectl create -f "${pod_config_dir}/pv-pod.yaml"
+
+	# Check pod creation
+	kubectl wait --for=condition=Ready --timeout=$timeout pod "$pod_name"
+
+	cmd="cat /mnt/index.html"
+	kubectl exec $pod_name -- sh -c "$cmd" | grep "$msg"
+}
+
+teardown() {
+	[ "${KATA_HYPERVISOR}" == "firecracker" ] && skip "test not working see: ${fc_limitations}"
+
+	# Debugging information
+	kubectl describe "pod/$pod_name"
+
+	kubectl delete pod "$pod_name"
+	kubectl delete pvc "$volume_claim"
+	kubectl delete pv "$volume_name"
+	rm -f "$pod_yaml"
+	exec_host rm -rf "$tmp_file"
+}

tests/integration/kubernetes/run_kubernetes_tests.sh

@@ -51,6 +51,7 @@ else
 		"k8s-sysctls.bats" \
 		"k8s-security-context.bats" \
 		"k8s-shared-volume.bats" \
+		"k8s-volume.bats" \
 		"k8s-nginx-connectivity.bats" \
 	)
 fi

tests/integration/kubernetes/runtimeclass_workloads/pv-pod.yaml

@@ -0,0 +1,26 @@
+#
+# Copyright (c) 2018 Intel Corporation
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+kind: Pod
+apiVersion: v1
+metadata:
+  name: pv-pod
+spec:
+  terminationGracePeriodSeconds: 0
+  runtimeClassName: kata
+  volumes:
+    - name: pv-storage
+      persistentVolumeClaim:
+       claimName: pv-claim
+  containers:
+    - name: pv-container
+      image: quay.io/prometheus/busybox:latest
+      ports:
+      command:
+        - sleep
+        - "120"
+      volumeMounts:
+        - mountPath: "/mnt/"
+          name: pv-storage

tests/integration/kubernetes/runtimeclass_workloads/pv-volume.yaml

@@ -0,0 +1,19 @@
+#
+# Copyright (c) 2018 Intel Corporation
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+kind: PersistentVolume
+apiVersion: v1
+metadata:
+  name: pv-volume
+  labels:
+    type: local
+spec:
+  storageClassName: manual
+  capacity:
+    storage: 10Gi
+  accessModes:
+    - ReadWriteOnce
+  hostPath:
+    path: "tmp_data"

tests/integration/kubernetes/runtimeclass_workloads/volume-claim.yaml

@@ -0,0 +1,16 @@
+#
+# Copyright (c) 2018 Intel Corporation
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+kind: PersistentVolumeClaim
+apiVersion: v1
+metadata:
+  name: pv-claim
+spec:
+  storageClassName: manual
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 3Gi

tests/integration/kubernetes/tests_common.sh

@@ -37,3 +37,16 @@ get_pod_config_dir() {
 	pod_config_dir="${BATS_TEST_DIRNAME}/runtimeclass_workloads_work"
 	info "k8s configured to use runtimeclass"
 }
+
+# Runs a command in the host filesystem.
+exec_host() {
+	node="$(kubectl get node -o name)"
+	# `kubectl debug` always returns 0, so we hack it to return the right exit code.
+	command="$@"
+	command+='; echo -en \\n$?'
+	output="$(kubectl debug -qit "${node}" --image=alpine:latest -- chroot /host bash -c "${command}")"
+	kubectl get pods -o name | grep node-debugger | xargs kubectl delete > /dev/null
+	exit_code="$(echo "${output}" | tail -1)"
+	echo "$(echo "${output}" | head -n -1)"
+	return ${exit_code}
+}