feat: kfn build --show-dockerfile

Author: yuwenma

go/cli/commands/build.go

@@ -51,6 +51,8 @@ func NewBuildCmd(ctx context.Context) *cobra.Command {
 		"the docker image tag")
 	r.Command.Flags().StringVarP(&r.DockerfilePath, "file", "f", "",
 		"Name of the Dockerfile. If not given, using a default builtin Dockerfile")
+	r.Command.Flags().BoolVarP(&r.ShowDockerfile, "show-dockerfile", "s", false,
+		"whether to store the builtin Dockerfile in the disk. Default to false")
 	return r.Command
 }
 
@@ -60,6 +62,7 @@ type BuildRunner struct {
 
 	Tag            string
 	DockerfilePath string
+	ShowDockerfile bool
 }
 
 func (r *BuildRunner) PreRunE(cmd *cobra.Command, args []string) error {
@@ -90,8 +93,12 @@ func (r *BuildRunner) runDockerBuild() error {
 		color.Red(strings.TrimSpace(errout.String()))
 		return err
 	}
+	// TODO: Print out building process in real time.
 	color.Green(out.String())
 	color.Green("Image %v builds successfully. Now you can publish the image", r.Tag)
+	if !r.ShowDockerfile {
+		return os.Remove(r.DockerfilePath)
+	}
 	return nil
 }
 
@@ -120,8 +127,7 @@ func (r *BuildRunner) createDockerfile() error {
 		return err
 	}
 	if err := os.WriteFile(DockerfilePath, dockerfileContent, 0644); err != nil {
-		return err
-	}
-	color.Green("created Dockerfile")
+			return err
+		}
 	return nil
 }