Apply dockefile exclude only for first stage

integration/dockerfiles/Dockerfile_test_dockerignore

@@ -1,5 +1,11 @@
 # This dockerfile makes sure the .dockerignore is working
 # If so then ignore/foo should copy to /foo
 # If not, then this image won't build because it will attempt to copy three files to /foo, which is a file not a directory
-FROM scratch 
+FROM scratch as base
 COPY ignore/* /foo
+
+From base as first
+COPY --from=base /foo ignore/bar
+
+FROM first
+COPY --from=first ignore/* /fooAnother/

pkg/executor/build.go

@@ -596,6 +596,7 @@ func DoBuild(opts *config.KanikoOptions) (v1.Image, error) {
 	}
 	logrus.Infof("Built cross stage deps: %v", crossStageDependencies)
 
+	util.IsFirstStage = true
 	for index, stage := range kanikoStages {
 		sb, err := newStageBuilder(opts, stage, crossStageDependencies, digestToCacheKey, stageIdxToDigest, stageNameToIdx)
 		if err != nil {
@@ -604,6 +605,7 @@ func DoBuild(opts *config.KanikoOptions) (v1.Image, error) {
 		if err := sb.build(); err != nil {
 			return nil, errors.Wrap(err, "error building stage")
 		}
+		util.IsFirstStage = false
 
 		reviewConfig(stage, &sb.cf.Config)
 

pkg/util/fs_util.go

@@ -73,6 +73,7 @@ var whitelist = initialWhitelist
 var volumes = []string{}
 
 var excluded []string
+var IsFirstStage = true
 
 type ExtractFunction func(string, *tar.Header, io.Reader) error
 
@@ -675,6 +676,10 @@ func GetExcludedFiles(dockerfilepath string, buildcontext string) error {
 
 // ExcludeFile returns true if the .dockerignore specified this file should be ignored
 func ExcludeFile(path, buildcontext string) bool {
+	// Do not apply dockerfile excludes for first stage
+	if !IsFirstStage {
+		return false
+	}
 	if HasFilepathPrefix(path, buildcontext, false) {
 		var err error
 		path, err = filepath.Rel(buildcontext, path)