adding EXPOSE command

pkg/commands/commands.go

@@ -38,6 +38,8 @@ func GetCommand(cmd instructions.Command) (DockerCommand, error) {
 	switch c := cmd.(type) {
 	case *instructions.RunCommand:
 		return &RunCommand{cmd: c}, nil
+	case *instructions.ExposeCommand:
+		return &ExposeCommand{cmd: c}, nil
 	case *instructions.EnvCommand:
 		return &EnvCommand{cmd: c}, nil
 	}

pkg/commands/expose.go

@@ -0,0 +1,40 @@
+package commands
+
+import (
+	"github.com/containers/image/manifest"
+	"github.com/docker/docker/builder/dockerfile/instructions"
+	"strings"
+)
+
+type ExposeCommand struct {
+	cmd *instructions.ExposeCommand
+}
+
+func (r *ExposeCommand) ExecuteCommand(config *manifest.Schema2Config) error {
+	return updateExposedPorts(r.Ports, config)
+}
+
+func updateExposedPorts(ports []string, config *manifest.Schema2Config) error {
+	// Grab the currently exposed ports
+	existingPorts := config.ExposedPorts
+
+	// Add any new ones in
+	for _, p := range ports {
+		// Add the default protocol if one isn't specified
+		if !strings.Contains(p, "/") {
+			p = p + "/tcp"
+		}
+		existingPorts[p] = {}
+	}
+	config.ExposedPorts = existingPorts
+	return nil
+}
+
+func (r *ExposeCommand) FilesToSnapshot() []string {
+	return []string{}
+}
+
+func (r *ExposeCommand) CreatedBy() string {
+	s := []string{"/bin/sh", "-c"}
+	return strings.Join(append(s, r.Ports...), " ")
+}

pkg/commands/expose_test.go

@@ -0,0 +1,30 @@
+package commands
+
+import (
+	"github.com/GoogleCloudPlatform/k8s-container-builder/testutil"
+	"github.com/containers/image/manifest"
+	"testing"
+)
+
+func TestUpdateExposedPorts(t *testing.T) {
+	cfg := &manifest.Schema2Config{
+		ExposedPorts: manifest.Schema2PortSet{
+			"8080/tcp": {},
+		},
+	}
+
+	ports := []string{
+		"8080",
+		"8081/tcp",
+		"8082",
+	}
+
+	expectedPorts := manifest.Schema2PortSet{
+		"8080/tcp": {},
+		"8081/tcp": {},
+		"8082/tcp": {},
+	}
+
+	updateExposedPorts(ports, cfg)
+	testutil.CheckErrorAndDeepEqual(t, false, nil, expectedPorts, cfg.ExposedPorts)
+}