repo_description: Build Container Images In Kubernetes
repo_topics: containers developer-tools docker kubernetes
code: /*
  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"
  	"strings"
  
  	"github.com/GoogleContainerTools/kaniko/pkg/dockerfile"
  	v1 "github.com/google/go-containerregistry/pkg/v1"
  
  	"github.com/GoogleContainerTools/kaniko/pkg/util"
  	"github.com/moby/buildkit/frontend/dockerfile/instructions"
  	"github.com/sirupsen/logrus"
  )
  
  type ExposeCommand struct {
  	BaseCommand
  	cmd *instructions.ExposeCommand
  }
  
  func (r *ExposeCommand) ExecuteCommand(config *v1.Config, buildArgs *dockerfile.BuildArgs) error {
  	logrus.Info("Cmd: EXPOSE")
  	// Grab the currently exposed ports
  	existingPorts := config.ExposedPorts
  	if existingPorts == nil {
  		existingPorts = make(map[string]struct{})
  	}
  	replacementEnvs := buildArgs.ReplacementEnvs(config.Env)
  	// Add any new ones in
  	for _, p := range r.cmd.Ports {
  		// Resolve any environment variables
  		p, err := util.ResolveEnvironmentReplacement(p, replacementEnvs, false)
  		if err != nil {
  			return err
  		}
  		// 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)
  		existingPorts[p] = struct{}{}
  	}
  	config.ExposedPorts = existingPorts
  	return nil
  }
  
  func validProtocol(protocol string) bool {
  	validProtocols := [2]string{"tcp", "udp"}
  	for _, p := range validProtocols {
  		if protocol == p {
  			return true
  		}
  	}
  	return false
  }
  
  func (r *ExposeCommand) String() string {
  	return r.cmd.String()
  }
  