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 +1,74 @@
+/*
+Copyright 2018 Google LLC
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package commands
+
+import (
+	"fmt"
+	"github.com/containers/image/manifest"
+	"github.com/docker/docker/builder/dockerfile/instructions"
+	"github.com/sirupsen/logrus"
+	"strings"
+)
+
+type ExposeCommand struct {
+	cmd *instructions.ExposeCommand
+}
+
+func (r *ExposeCommand) ExecuteCommand(config *manifest.Schema2Config) error {
+	return updateExposedPorts(r.cmd.Ports, config)
+}
+
+func validProtocol(protocol string) bool {
+	validProtocols := [2]string{"tcp", "udp"}
+	for _, p := range validProtocols {
+		if protocol == p {
+			return true
+		}
+	}
+	return false
+}
+
+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"
+		}
+		protocol := strings.Split(p, "/")[1]
+		if !validProtocol(protocol) {
+			return fmt.Errorf("Invalid protocol: %s", protocol)
+		}
+		logrus.Infof("Adding exposed port: %s", p)
+		var x struct{}
+		existingPorts[manifest.Schema2Port(p)] = x
+	}
+	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.cmd.Ports...), " ")
+}

pkg/commands/expose_test.go

@@ -0,0 +1,61 @@
+/*
+Copyright 2018 Google LLC
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+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",
+		"8083/udp",
+	}
+
+	expectedPorts := manifest.Schema2PortSet{
+		"8080/tcp": {},
+		"8081/tcp": {},
+		"8082/tcp": {},
+		"8083/udp": {},
+	}
+
+	err := updateExposedPorts(ports, cfg)
+	testutil.CheckErrorAndDeepEqual(t, false, err, expectedPorts, cfg.ExposedPorts)
+}
+
+func TestInvalidProtocol(t *testing.T) {
+	cfg := &manifest.Schema2Config{
+		ExposedPorts: manifest.Schema2PortSet{},
+	}
+
+	ports := []string{
+		"80/garbage",
+	}
+
+	err := updateExposedPorts(ports, cfg)
+	testutil.CheckErrorAndDeepEqual(t, true, err, nil, nil)
+}