fix setting log level

cmd/tendermint/commands/root.go

@@ -3,13 +3,14 @@ package commands
 import (
 	"github.com/spf13/cobra"
 
-	cfg "github.com/tendermint/go-config"
 	"github.com/tendermint/go-logger"
 	tmcfg "github.com/tendermint/tendermint/config/tendermint"
 )
 
-var config cfg.Config
-var log = logger.New("module", "main")
+var (
+	config = tmcfg.GetConfig("")
+	log    = logger.New("module", "main")
+)
 
 //global flag
 var logLevel string
@@ -18,18 +19,13 @@ var RootCmd = &cobra.Command{
 	Use:   "tendermint",
 	Short: "Tendermint Core (BFT Consensus) in Go",
 	PersistentPreRun: func(cmd *cobra.Command, args []string) {
+		// set the log level in the config and logger
 		config.Set("log_level", logLevel)
+		logger.SetLogLevel(logLevel)
 	},
 }
 
 func init() {
-
-	// Get configuration
-	config = tmcfg.GetConfig("")
-
 	//parse flag and set config
 	RootCmd.PersistentFlags().StringVar(&logLevel, "log_level", config.GetString("log_level"), "Log level")
-
-	// set the log level
-	logger.SetLogLevel(config.GetString("log_level"))
 }