Remove commit revision in version command (#905)

The error occurs when running `$ yorkie version`. The cause was not
found, but since revision wasn't strictly necessary, this commit
removes revision from version command.

cmd/yorkie/version.go

@@ -19,45 +19,25 @@ package main
 import (
 	"fmt"
 	"runtime"
-	"runtime/debug"
 
 	"github.com/spf13/cobra"
 
 	"github.com/yorkie-team/yorkie/internal/version"
 )
 
-const commitRevisionKey = "vcs.revision"
-
 func newVersionCmd() *cobra.Command {
 	return &cobra.Command{
 		Use:   "version",
 		Short: "Print the version number of Yorkie",
 		RunE: func(cmd *cobra.Command, args []string) error {
-			revision := settingByKey(commitRevisionKey)
 			fmt.Printf("Yorkie: %s\n", version.Version)
-			fmt.Printf("Commit: %s\n", revision[:7])
 			fmt.Printf("Go: %s\n", runtime.Version())
 			fmt.Printf("Build date: %s\n", version.BuildDate)
 			return nil
 		},
 	}
 }
 
-func settingByKey(key string) string {
-	info, ok := debug.ReadBuildInfo()
-	if !ok {
-		return ""
-	}
-
-	for _, setting := range info.Settings {
-		if setting.Key == key {
-			return setting.Value
-		}
-	}
-
-	return ""
-}
-
 func init() {
 	rootCmd.AddCommand(newVersionCmd())
 }

server/backend/backend.go

@@ -118,7 +118,7 @@ func New(
 	}
 
 	logging.DefaultLogger().Infof(
-		"backend created: id: %s, rpc: %s",
+		"backend created: id: %s, db: %s",
 		serverInfo.ID,
 		dbInfo,
 	)