Adding (basic) configuration (#135)

cli/cmd/root.go

@@ -1,14 +1,32 @@
 package cmd
 
 import (
+	"errors"
+	"fmt"
 	"github.com/spf13/cobra"
+	"github.com/up9inc/mizu/cli/mizu"
 )
 
+var commandLineFlags []string
+
 var rootCmd = &cobra.Command{
 	Use:   "mizu",
 	Short: "A web traffic viewer for kubernetes",
 	Long: `A web traffic viewer for kubernetes
 Further info is available at https://github.com/up9inc/mizu`,
+	PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
+		if err := mizu.InitConfig(commandLineFlags); err != nil {
+			mizu.Log.Errorf("Invalid config, Exit %s", err)
+			return errors.New(fmt.Sprintf("%v", err))
+		}
+		prettifiedConfig := mizu.GetConfigStr()
+		mizu.Log.Debugf("Final Config: %s", prettifiedConfig)
+		return nil
+	},
+}
+
+func init() {
+	rootCmd.PersistentFlags().StringSliceVar(&commandLineFlags, "set", []string{}, "Override values using --set")
 }
 
 // Execute adds all child commands to the root command and sets flags appropriately.