Check if config fields are nil

pkg/commands/expose.go

@@ -33,6 +33,9 @@ func (r *ExposeCommand) ExecuteCommand(config *manifest.Schema2Config) error {
 	logrus.Info("cmd: EXPOSE")
 	// Grab the currently exposed ports
 	existingPorts := config.ExposedPorts
+	if existingPorts == nil {
+		existingPorts = make(map[manifest.Schema2Port]struct{})
+	}
 	// Add any new ones in
 	for _, p := range r.cmd.Ports {
 		// Resolve any environment variables

pkg/commands/label.go

@@ -35,7 +35,9 @@ func (r *LabelCommand) ExecuteCommand(config *manifest.Schema2Config) error {
 
 func updateLabels(labels []instructions.KeyValuePair, config *manifest.Schema2Config) error {
 	existingLabels := config.Labels
-
+	if existingLabels == nil {
+		existingLabels = make(map[string]string)
+	}
 	// Let's unescape values before setting the label
 	for index, kvp := range labels {
 		unescaped, err := util.ResolveEnvironmentReplacement(kvp.Value, []string{}, false)