continue build on expose with :, but displays a warning

buildfile.go

@@ -187,9 +187,6 @@ func (b *buildFile) CmdCmd(args string) error {
 }
 
 func (b *buildFile) CmdExpose(args string) error {
-	if strings.Contains(args, ":") {
-		return fmt.Errorf("EXPOSE cannot be used to bind to a host ip or port")
-	}
 	ports := strings.Split(args, " ")
 	b.config.PortSpecs = append(ports, b.config.PortSpecs...)
 	return b.commit("", b.config.Cmd, fmt.Sprintf("EXPOSE %v", ports))
@@ -433,10 +430,13 @@ func (b *buildFile) commit(id string, autoCmd []string, comment string) error {
 			}
 		}
 
-		container, _, err := b.runtime.Create(b.config, "")
+		container, warnings, err := b.runtime.Create(b.config, "")
 		if err != nil {
 			return err
 		}
+		for _, warning := range warnings {
+			fmt.Fprintf(b.out, " ---> [Warning] %s\n", warning)
+		}
 		b.tmpContainers[container.ID] = struct{}{}
 		fmt.Fprintf(b.out, " ---> Running in %s\n", utils.TruncateID(container.ID))
 		id = container.ID

runtime.go

@@ -317,22 +317,20 @@ func (runtime *Runtime) Create(config *Config, name string) (*Container, []strin
 		return nil, nil, err
 	}
 
-	warnings := []string{}
 	if img.Config != nil {
-		if img.Config.PortSpecs != nil && warnings != nil {
-			for _, p := range img.Config.PortSpecs {
-				if strings.Contains(p, ":") {
-					warnings = append(warnings, "This image expects private ports to be mapped to public ports on your host. "+
-						"This has been deprecated and the public mappings will not be honored."+
-						"Use -p to publish the ports.")
-					break
-				}
-			}
-		}
 		if err := MergeConfig(config, img.Config); err != nil {
 			return nil, nil, err
 		}
 	}
+	warnings := []string{}
+	if config.PortSpecs != nil {
+		for _, p := range config.PortSpecs {
+			if strings.Contains(p, ":") {
+				warnings = append(warnings, "The mapping to a public ports on your host has been deprecated. Use -p to publish the ports.")
+				break
+			}
+		}
+	}
 
 	if len(config.Entrypoint) != 0 && config.Cmd == nil {
 		config.Cmd = []string{}

runtime_test.go

@@ -260,6 +260,21 @@ func TestRuntimeCreate(t *testing.T) {
 	if err != nil {
 		t.Error(err)
 	}
+
+	// test expose 80:8000
+	container, warnings, err := runtime.Create(&Config{
+		Image:     GetTestImage(runtime).ID,
+		Cmd:       []string{"ls", "-al"},
+		PortSpecs: []string{"80:8000"},
+	},
+		"",
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if warnings == nil {
+		t.Error("Expected a warning, got none")
+	}
 }
 
 func TestDestroy(t *testing.T) {