fix: fix hgctl in high kubenetes version problem by auto detecting k8s version and adding helm lookup function (#629)

pkg/cmd/hgctl/installer/server_info.go

@@ -0,0 +1,66 @@
+// Copyright (c) 2022 Alibaba Group Holding Ltd.
+//
+// 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 installer
+
+import (
+	"github.com/alibaba/higress/pkg/cmd/hgctl/kubernetes"
+	"github.com/pkg/errors"
+	"helm.sh/helm/v3/pkg/action"
+	"helm.sh/helm/v3/pkg/chartutil"
+	"k8s.io/client-go/discovery"
+)
+
+type ServerInfo struct {
+	kubeCli kubernetes.CLIClient
+}
+
+func (c *ServerInfo) GetCapabilities() (*chartutil.Capabilities, error) {
+	// force a discovery cache invalidation to always fetch the latest server version/capabilities.
+	dc := c.kubeCli.KubernetesInterface().Discovery()
+
+	kubeVersion, err := dc.ServerVersion()
+	if err != nil {
+		return nil, errors.Wrap(err, "could not get server version from Kubernetes")
+	}
+	// Issue #6361:
+	// Client-Go emits an error when an API service is registered but unimplemented.
+	// We trap that error here and print a warning. But since the discovery client continues
+	// building the API object, it is correctly populated with all valid APIs.
+	// See https://github.com/kubernetes/kubernetes/issues/72051#issuecomment-521157642
+	apiVersions, err := action.GetVersionSet(dc)
+	if err != nil {
+		if discovery.IsGroupDiscoveryFailedError(err) {
+		} else {
+			return nil, errors.Wrap(err, "could not get apiVersions from Kubernetes")
+		}
+	}
+	capabilities := &chartutil.Capabilities{
+		APIVersions: apiVersions,
+		KubeVersion: chartutil.KubeVersion{
+			Version: kubeVersion.GitVersion,
+			Major:   kubeVersion.Major,
+			Minor:   kubeVersion.Minor,
+		},
+		HelmVersion: chartutil.DefaultCapabilities.HelmVersion,
+	}
+	return capabilities, nil
+}
+
+func NewServerInfo(kubCli kubernetes.CLIClient) (*ServerInfo, error) {
+	serverInfo := &ServerInfo{
+		kubeCli: kubCli,
+	}
+	return serverInfo, nil
+}