a failed duplicate lookup is unknown, like unreadable content

1 files changed, 29 insertions, 0 deletions

diff --git a/internal/engine/exclude_test.go b/internal/engine/exclude_test.go
index 6381a04..7069623 100644
--- a/internal/engine/exclude_test.go
+++ b/internal/engine/exclude_test.go
@@ -547,3 +547,32 @@ func TestNotMatchedAfterAnUnknownRuleDoesNotAct(t *testing.T) {
 		}
 	}
 }
+
+// TestDuplicateExcludeFailsClosed: an exclude whose duplicate lookup fails
+// holds, marked as such (plan 12).
+func TestDuplicateExcludeFailsClosed(t *testing.T) {
+	if os.Getuid() == 0 {
+		t.Skip("root reads a chmod 000 file")
+	}
+	h, dl := excludeTree(t, map[string]string{"a.txt": "same size", "b.txt": "same size"})
+	os.Chmod(filepath.Join(dl, "a.txt"), 0)
+	t.Cleanup(func() { os.Chmod(filepath.Join(dl, "a.txt"), 0o644) })
+	main := writeConfig(t, h, `(include "dl")`, map[string]string{"dl": `
+(path "~/dl")
+(exclude (duplicate))
+(rule "all" (move "Out"))
+`})
+	e, errs := Load(main)
+	if len(errs) > 0 {
+		t.Fatal(errs)
+	}
+	r, err := e.Match(context.Background(), e.Dirs[0])
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, fm := range r.Matched {
+		if fm.File.Rel == "a.txt" && fm.Excluded != "(exclude (duplicate)) (duplicate check failed)" {
+			t.Errorf("a.txt: Excluded %q, rules %d; want set aside as duplicate check failed", fm.Excluded, len(fm.Rules))
+		}
+	}
+}