add version command

cmd/root.go

@@ -22,6 +22,7 @@ THE SOFTWARE.
 package cmd
 
 import (
+	"fmt"
 	"os"
 	"strings"
 
@@ -31,6 +32,8 @@ import (
 	"github.com/rancher/k3d/cmd/delete"
 	"github.com/rancher/k3d/cmd/get"
 
+	"github.com/rancher/k3d/version"
+
 	log "github.com/sirupsen/logrus"
 )
 
@@ -76,6 +79,15 @@ func init() {
 	rootCmd.AddCommand(create.NewCmdCreate())
 	rootCmd.AddCommand(delete.NewCmdDelete())
 	rootCmd.AddCommand(get.NewCmdGet())
+
+	rootCmd.AddCommand(&cobra.Command{
+		Use:   "version",
+		Short: "Print k3d version",
+		Long:  "Print k3d version",
+		Run: func(cmd *cobra.Command, args []string) {
+			fmt.Printf("k3d version %s\n", version.GetVersion())
+		},
+	})
 }
 
 // initLogging initializes the logger

version/version.go

@@ -1,3 +1,24 @@
+/*
+Copyright © 2019 Thorsten Klein <iwilltry42@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
 package version
 
 // Version is the string that contains version