cleanup debug logs & remove duplicated output (#1348)

* cleanup debug logs

* avoid duplicate error messages

and this makes main.go use os and fmt package instead of log to avoid
touching global state

cmd/root.go

@@ -49,14 +49,14 @@ var (
 
 // RootCmd root level flags and commands
 var RootCmd = &cobra.Command{
-	Use:   "kompose",
+	Use:           "kompose",
-	Short: "A tool helping Docker Compose users move to Kubernetes",
+	Short:         "A tool helping Docker Compose users move to Kubernetes",
-	Long:  `Kompose is a tool to help users who are familiar with docker-compose move to Kubernetes.`,
+	Long:          `Kompose is a tool to help users who are familiar with docker-compose move to Kubernetes.`,
+	SilenceErrors: true,
 	// PersistentPreRun will be "inherited" by all children and ran before *every* command unless
 	// the child has overridden the functionality. This functionality was implemented to check / modify
 	// all global flag calls regardless of app call.
 	PersistentPreRun: func(cmd *cobra.Command, args []string) {
-
 		// Add extra logging when verbosity is passed
 		if GlobalVerbose {
 			log.SetLevel(log.DebugLevel)
@@ -81,7 +81,6 @@ var RootCmd = &cobra.Command{
 		if provider != "kubernetes" && provider != "openshift" {
 			log.Fatalf("%s is an unsupported provider. Supported providers are: 'kubernetes', 'openshift'.", GlobalProvider)
 		}
-
 	},
 }
 

main.go

@@ -17,14 +17,15 @@ limitations under the License.
 package main
 
 import (
-	"log"
+	"fmt"
+	"os"
 
 	"github.com/kubernetes/kompose/cmd"
 )
 
 func main() {
 	if err := cmd.Execute(); err != nil {
-		log.SetFlags(0)
+		fmt.Fprintln(os.Stderr, err)
-		log.Fatal(err)
+		os.Exit(1)
 	}
 }

pkg/transformer/kubernetes/kubernetes.go

@@ -139,8 +139,6 @@ func (k *Kubernetes) InitPodSpecWithConfigMap(name string, image string, service
 	var volumeMounts []api.VolumeMount
 	var volumes []api.Volume
 
-	log.Debugf("Configs in InitPodSpecWithConfigMap: %+v", service.Configs)
-
 	for _, value := range service.Configs {
 		cmVolName := FormatFileName(value.Source)
 		target := value.Target
@@ -598,7 +596,6 @@ func (k *Kubernetes) ConfigServicePorts(name string, service kobject.ServiceConf
 	seenPorts := make(map[int]struct{}, len(service.Port))
 
 	var servicePort api.ServicePort
-	log.Debugf("Ports in ConfigServicePorts: %+v", service.Port)
 	for _, port := range service.Port {
 		if port.HostPort == 0 {
 			port.HostPort = port.ContainerPort