e2e: node: unify sample device plugin utilities

Start to consolidate the sample device plugin utility
and constants in a central place, because we need
to use it in different e2e tests.

Having a central dependency is better than a maze of
entangled e2e tests depending on each other helpers.

Signed-off-by: Francesco Romani <fromani@redhat.com>

test/e2e_node/util_sampledevice.go

@@ -0,0 +1,52 @@
+/*
+Copyright 2023 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package e2enode
+
+import (
+	v1 "k8s.io/api/core/v1"
+)
+
+const (
+	// SampleDevicePluginDSYAML is the path of the daemonset template of the sample device plugin. // TODO: Parametrize it by making it a feature in TestFramework.
+	SampleDevicePluginDSYAML = "test/e2e/testing-manifests/sample-device-plugin.yaml"
+
+	// SampleDevicePluginName is the name of the device plugin pod
+	SampleDevicePluginName = "sample-device-plugin"
+
+	// SampleDeviceResourceName is the name of the resource provided by the sample device plugin
+	SampleDeviceResourceName = "example.com/resource"
+
+	SampleDeviceEnvVarNamePluginSockDir = "PLUGIN_SOCK_DIR"
+)
+
+// CountSampleDeviceCapacity returns the number of devices of SampleDeviceResourceName advertised by a node capacity
+func CountSampleDeviceCapacity(node *v1.Node) int64 {
+	val, ok := node.Status.Capacity[v1.ResourceName(SampleDeviceResourceName)]
+	if !ok {
+		return 0
+	}
+	return val.Value()
+}
+
+// CountSampleDeviceAllocatable returns the number of devices of SampleDeviceResourceName advertised by a node allocatable
+func CountSampleDeviceAllocatable(node *v1.Node) int64 {
+	val, ok := node.Status.Allocatable[v1.ResourceName(SampleDeviceResourceName)]
+	if !ok {
+		return 0
+	}
+	return val.Value()
+}