Tighten opaque plugin content boundaries

2026-09-03 18:24:39 +08:00
parent 80cddbf19d
commit 14cbc63e61
31 changed files with 452 additions and 558 deletions
@@ -309,6 +309,18 @@ func TestDockerDistributionBuilderStreamsProgressMarkers(t *testing.T) {
 	}
 }

+func TestAppendBoundedBuilderOutputKeepsTail(t *testing.T) {
+	var output bytes.Buffer
+	appendBoundedBuilderOutput(&output, bytes.Repeat([]byte("a"), maxBuilderDiagnosticOutputBytes))
+	appendBoundedBuilderOutput(&output, []byte("tail"))
+	if output.Len() != maxBuilderDiagnosticOutputBytes {
+		t.Fatalf("builder diagnostic buffer grew beyond cap: %d", output.Len())
+	}
+	if !strings.HasSuffix(output.String(), "tail") {
+		t.Fatalf("builder diagnostic buffer did not keep tail output")
+	}
+}
+
 func TestDockerDistributionBuilderRedactsFailureAndTimeout(t *testing.T) {
 	sourceDir := createBuilderSource(t)
 	workspaceDir := t.TempDir()