added stopsignal implementation

pkg/commands/commands.go

@@ -61,6 +61,8 @@ func GetCommand(cmd instructions.Command, buildcontext string) (DockerCommand, e
 		return &OnBuildCommand{cmd: c}, nil
 	case *instructions.VolumeCommand:
 		return &VolumeCommand{cmd: c}, nil
+	case *instructions.StopSignalCommand:
+		return &StopSignalCommand{cmd: c}, nil
 	case *instructions.MaintainerCommand:
 		logrus.Warnf("%s is deprecated, skipping", cmd.Name())
 		return nil, nil

pkg/commands/stopsignal.go

@@ -0,0 +1,58 @@
+/*
+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 (
+	"strings"
+
+	"github.com/GoogleContainerTools/kaniko/pkg/util"
+	"github.com/docker/docker/builder/dockerfile/instructions"
+	"github.com/google/go-containerregistry/v1"
+	"github.com/sirupsen/logrus"
+)
+
+type StopSignalCommand struct {
+	cmd *instructions.StopSignalCommand
+}
+
+// ExecuteCommand handles command processing similar to CMD and RUN,
+func (s *StopSignalCommand) ExecuteCommand(config *v1.Config) error {
+	logrus.Info("cmd: STOPSIGNAL")
+
+	// resolve possible environment variables
+	resolvedEnvs, err := util.ResolveEnvironmentReplacementList([]string{s.cmd.Signal}, config.Env, true)
+	if err != nil {
+		return err
+	}
+	signal := resolvedEnvs[len(resolvedEnvs)-1]
+
+	logrus.Infof("Replacing StopSignal in config with %v", signal)
+	config.StopSignal = signal
+	return nil
+}
+
+// FilesToSnapshot returns an empty array since this is a metadata command
+func (s *StopSignalCommand) FilesToSnapshot() []string {
+	return []string{}
+}
+
+// CreatedBy returns some information about the command for the image config history
+func (s *StopSignalCommand) CreatedBy() string {
+	entrypoint := []string{"STOPSIGNAL"}
+
+	return strings.Join(append(entrypoint, s.cmd.Signal), " ")
+}