Add version command for tkctl (pingcap#456)

* Add version command for tkctl

Signed-off-by: Aylei <[email protected]>

pkg/tkctl/cmd/cmd.go

@@ -15,6 +15,7 @@ package cmd
 
 import (
 	"flag"
+	"github.com/pingcap/tidb-operator/pkg/tkctl/cmd/version"
 	"io"
 
 	"github.com/pingcap/tidb-operator/pkg/tkctl/cmd/completion"
@@ -67,6 +68,7 @@ func NewTkcCommand(streams genericclioptions.IOStreams) *cobra.Command {
 				get.NewCmdGet(tkcContext, streams),
 				info.NewCmdInfo(tkcContext, streams),
 				use.NewCmdUse(tkcContext, streams),
+				version.NewCmdVersion(tkcContext, streams.Out),
 			},
 		},
 		{

pkg/tkctl/cmd/version/version.go

@@ -0,0 +1,125 @@
+// Copyright 2019. PingCAP, Inc.
+//
+// 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,
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package version
+
+import (
+	"fmt"
+	"io"
+
+	"github.com/pingcap/tidb-operator/pkg/label"
+	"github.com/pingcap/tidb-operator/pkg/tkctl/config"
+	"github.com/pingcap/tidb-operator/version"
+	"github.com/spf13/cobra"
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/kubernetes/pkg/apis/core"
+	cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
+)
+
+const (
+	versionExample = `
+		# Print the cli version and tidb operator version
+		tkctl version
+`
+)
+
+type VersionOptions struct {
+	ClientOnly bool
+
+	io.Writer
+}
+
+func NewCmdVersion(tkcContext *config.TkcContext, out io.Writer) *cobra.Command {
+	options := &VersionOptions{
+		Writer: out,
+	}
+	cmd := &cobra.Command{
+		Use:     "version",
+		Short:   "Print the client & server version",
+		Example: versionExample,
+		Run: func(_ *cobra.Command, _ []string) {
+			cmdutil.CheckErr(options.runVersion(tkcContext))
+		},
+	}
+
+	cmd.Flags().BoolVarP(&options.ClientOnly, "client-only", "c", options.ClientOnly,
+		"show only client version")
+
+	return cmd
+}
+
+func (o *VersionOptions) runVersion(tkcContext *config.TkcContext) error {
+	restConfig, err := tkcContext.ToRESTConfig()
+	if err != nil {
+		return err
+	}
+	kubeCli, err := kubernetes.NewForConfig(restConfig)
+	if err != nil {
+		return err
+	}
+
+	clientVersion := version.Get()
+
+	fmt.Fprintf(o, "Client Version: %s\n", clientVersion)
+
+	if o.ClientOnly {
+		return nil
+	}
+
+	controllers, err := kubeCli.AppsV1().
+		Deployments(core.NamespaceAll).
+		List(v1.ListOptions{
+			LabelSelector: fmt.Sprintf("%s=%s,%s=%s", label.ComponentLabelKey, "controller-manager", label.InstanceLabelKey, "tidb-operator"),
+		})
+	if err != nil {
+		return err
+	}
+	schedulers, err := kubeCli.AppsV1().
+		Deployments(core.NamespaceAll).
+		List(v1.ListOptions{
+			LabelSelector: fmt.Sprintf("%s=%s,%s=%s", label.ComponentLabelKey, "scheduler", label.InstanceLabelKey, "tidb-operator"),
+		})
+	if err != nil {
+		return nil
+	}
+
+	// TODO: add version endpoint in tidb-controller-manager
+	// There's no version endpoint of tidb-controller-manager and tidb-scheduler, use image instead
+	if len(controllers.Items) == 0 {
+		fmt.Fprintf(o, "No TiDB Controller Manager found, please install one first\n")
+	} else if len(controllers.Items) == 1 {
+		fmt.Fprintf(o, "TiDB Controller Manager Version: %s\n", controllers.Items[0].Spec.Template.Spec.Containers[0].Image)
+	} else {
+		fmt.Fprintf(o, "TiDB Controller Manager Versions:\n")
+		for _, item := range controllers.Items {
+			fmt.Fprintf(o, "\t%s: %s\n", item.Name, item.Spec.Template.Spec.Containers[0].Image)
+		}
+	}
+	if len(schedulers.Items) == 0 {
+		fmt.Fprintf(o, "No TiDB Scheduler found, please install one first\n")
+	} else if len(schedulers.Items) == 1 {
+		fmt.Fprintf(o, "TiDB Scheduler Version:\n")
+		for _, container := range schedulers.Items[0].Spec.Template.Spec.Containers {
+			fmt.Fprintf(o, "\t%s: %s\n", container.Name, container.Image)
+		}
+	} else {
+		// warn for multiple scheduler
+		fmt.Fprintf(o, "WARN: more than one TiDB Scheduler instance found, this is un-supported and may lead to un-expected behavior:\n")
+		for _, item := range schedulers.Items {
+			fmt.Fprintf(o, "\t%s\n", item.Name)
+		}
+	}
+
+	return nil
+}