release config gen writes file

Author: brooksn

cmd/release/cmd/config.go

@@ -1,7 +1,9 @@
 package cmd
 
 import (
-	"fmt"
+	"errors"
+	"os"
+	"path/filepath"
 
 	"github.com/rancher/ecm-distro-tools/cmd/release/config"
 	"github.com/spf13/cobra"
@@ -17,11 +19,28 @@ var genConfigSubCmd = &cobra.Command{
 	Use:   "gen",
 	Short: "Generates a config file in the default location if it doesn't exists",
 	RunE: func(cmd *cobra.Command, args []string) error {
+		configPath := filepath.Clean(os.ExpandEnv(configFile))
+
+		if _, err := os.Stat(configPath); err == nil {
+			return errors.New("config file already exists at " + configPath)
+		} else if !errors.Is(err, os.ErrNotExist) {
+			return err
+		}
+
 		conf, err := config.ExampleConfig()
 		if err != nil {
 			return err
 		}
-		fmt.Println(conf)
+
+		if err := os.MkdirAll(filepath.Dir(configPath), 0755); err != nil {
+			return err
+		}
+
+		if err := os.WriteFile(configPath, []byte(conf+"\n"), 0600); err != nil {
+			return err
+		}
+
+		cmd.Println("config file written to " + configPath)
 		return nil
 	},
 }