Also read up to 256MB from stdin

acceptance.bats

@@ -293,4 +293,10 @@ resetCacheFolder() {
   run bin/kubeconform -summary fixtures/valid_large.yaml
   [ "$status" -eq 0 ]
   [ "$output" = 'Summary: 100000 resources found in 1 file - Valid: 100000, Invalid: 0, Errors: 0, Skipped: 0' ]
-}
+}
+
+@test "Should support very long streams from stdin" {
+  run bash -c "cat fixtures/valid_large.yaml | bin/kubeconform -summary"
+  [ "$status" -eq 0 ]
+  [ "$output" = 'Summary: 100000 resources found parsing stdin - Valid: 100000, Invalid: 0, Errors: 0, Skipped: 0' ]
+}

pkg/resource/files.go

@@ -91,7 +91,7 @@ func findResourcesInReader(p string, f io.Reader, resources chan<- Resource, err
 	scanner := bufio.NewScanner(f)
 	// We start with a buf that is 4MB, scanner will resize it up to 256MB if needed
 	// https://github.com/golang/go/blob/aeea5bacbf79fb945edbeac6cd7630dd70c4d9ce/src/bufio/scan.go#L191
-	scanner.Buffer(buf, 256*1024*1024*1024)
+	scanner.Buffer(buf, 256*1024*1024)
 	scanner.Split(SplitYAMLDocument)
 	nRes := 0
 	for scanner.Scan() {

pkg/resource/stream.go

@@ -48,9 +48,9 @@ func FromStream(ctx context.Context, path string, r io.Reader) (<-chan Resource,
 
 	go func() {
 		scanner := bufio.NewScanner(r)
-		const maxResourceSize = 4 * 1024 * 1024 // 4MB ought to be enough for everybody
+		const maxResourceSize = 4 * 1024 * 1024 // Start with 4MB
 		buf := make([]byte, maxResourceSize)
-		scanner.Buffer(buf, maxResourceSize)
+		scanner.Buffer(buf, 256*1024*1024) // Resize up to 256MB
 		scanner.Split(SplitYAMLDocument)
 
 	SCAN: