1 files changed, 65 insertions, 0 deletions
diff --git a/tests/root_test/btrfs_test.go b/tests/root_test/btrfs_test.go
new file mode 100644
index 0000000..4f2527a
--- /dev/null
+++ b/tests/root_test/btrfs_test.go
@@ -0,0 +1,65 @@
+package root_test
+
+import (
+	"os"
+	"os/exec"
+	"path/filepath"
+	"syscall"
+	"testing"
+
+	"github.com/rfjakob/gocryptfs/v2/internal/syscallcompat"
+
+	"github.com/rfjakob/gocryptfs/v2/tests/test_helpers"
+)
+
+// TestBtrfsQuirks needs root permissions because it creates a loop disk
+func TestBtrfsQuirks(t *testing.T) {
+	if os.Getuid() != 0 {
+		t.Skip("must run as root")
+	}
+
+	img := filepath.Join(test_helpers.TmpDir, t.Name()+".img")
+	f, err := os.Create(img)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+	// minimum size for each btrfs device is 114294784
+	err = f.Truncate(200 * 1024 * 1024)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Format as Btrfs
+	_, err = exec.LookPath("mkfs.btrfs")
+	if err != nil {
+		t.Skip("mkfs.btrfs not found, skipping test")
+	}
+	cmd := exec.Command("mkfs.btrfs", img)
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Logf("%q", cmd.Args)
+		t.Log(string(out))
+		t.Fatal(err)
+	}
+
+	// Mount
+	mnt := img + ".mnt"
+	err = os.Mkdir(mnt, 0600)
+	if err != nil {
+		t.Fatal(err)
+	}
+	cmd = exec.Command("mount", img, mnt)
+	out, err = cmd.CombinedOutput()
+	if err != nil {
+		t.Log(string(out))
+		t.Fatal(err)
+	}
+	defer syscall.Unlink(img)
+	defer syscall.Unmount(mnt, 0)
+
+	quirk := syscallcompat.DetectQuirks(mnt)
+	if quirk != syscallcompat.QuirkBrokenFalloc {
+		t.Errorf("wrong quirk: %v", quirk)
+	}
+}