ci: display version in ci subcommand, make image-tag required only in ci build command

cmd/ci.go

@@ -15,10 +15,12 @@
 package cmd
 
 import (
+	"fmt"
 	"os"
 
 	"git.psu.edu/k8s/devtool/config"
 	"git.psu.edu/k8s/devtool/environment"
+	"git.psu.edu/swe-golang/buildversion"
 
 	"github.com/fatih/color"
 	"github.com/spf13/cobra"
@@ -34,6 +36,13 @@ var ciCmd = &cobra.Command{
 	Run: func(cmd *cobra.Command, args []string) {
 		cmd.HelpFunc()(cmd, args)
 	},
+	PersistentPreRun: func(cmd *cobra.Command, args []string) {
+		fmt.Printf("devtool version: %s, commit: %s, builddate: %s\n\n",
+			buildversion.Get().Version,
+			buildversion.Get().Commit,
+			buildversion.Get().BuildDate,
+		)
+	},
 }
 
 func init() {
@@ -44,14 +53,8 @@ func init() {
 	// Cobra supports Persistent Flags which will work for this command
 	// and all subcommands, e.g.:
 	// configCmd.PersistentFlags().String("foo", "", "A help for foo")
-	ciCmd.PersistentFlags().StringVarP(&imageTag, "image-tag", "i", "", "image tag for docker")
 	ciCmd.PersistentFlags().StringVarP(&environmentSuffix, "environment", "e", "", "environment suffix to append to helm release name")
 
-	err := ciCmd.MarkPersistentFlagRequired("image-tag")
-	if err != nil {
-		panic("invalid arg")
-	}
-
 	// Cobra supports local flags which will only run when this command
 	// is called directly, e.g.:
 	// configCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")

cmd/ci_build.go

@@ -82,6 +82,11 @@ func init() {
 		panic("invalid arg")
 	}
 
+	ciBuildCmd.PersistentFlags().StringVarP(&imageTag, "image-tag", "i", "", "image tag for docker")
+	err = ciBuildCmd.MarkPersistentFlagRequired("image-tag")
+	if err != nil {
+		panic("invalid arg")
+	}
 }
 
 func buildCiDocker(config config.Config) error {