Function TestLoopbackOverlay

core/mount/manager/manager_linux_test.go:107–315

(t *testing.T)

}

func TestLoopbackOverlay(t *testing.T) {
	testutil.RequiresRoot(t)
	ctx := logtest.WithT(context.Background(), t)
	ctx = namespaces.WithNamespace(ctx, "test")
	td := t.TempDir()
	metadb := filepath.Join(td, "mounts.db")
	targetdir := filepath.Join(td, "m")
	db, err := bolt.Open(metadb, 0600, nil)
	if err != nil {
		t.Fatal(err)
	}

	l1 := fstest.Apply(
		fstest.CreateFile("/foo", []byte("foo\n"), 0777),
		fstest.CreateDir("/a", 0755),
		fstest.CreateDir("/a/b", 0755),
		fstest.CreateDir("/a/b/c", 0755),
	)

	l2 := fstest.Apply(
		fstest.CreateFile("/foo", []byte("foo\n"), 0777),
		fstest.CreateDir("/a", 0755),
		fstest.CreateDir("/a/b", 0755),
		fstest.CreateDir("/a/b/c", 0755),
	)

	for _, tc := range []struct {
		name   string
		mounts func() ([]mount.Mount, error)
	}{
		{
			name: "LoopOptions",
			mounts: func() ([]mount.Mount, error) {
				b1, err := initalizeBlockDevice(td, l1)
				if err != nil {
					return nil, err
				}
				b2, err := initalizeBlockDevice(td, l2)
				if err != nil {
					return nil, err
				}
				return []mount.Mount{
					{
						Type:    "ext4",
						Source:  b1,
						Options: []string{"loop"},
					},
					{
						Type:    "ext4",
						Source:  b2,
						Options: []string{"loop"},
					},
					{
						Type:   "format/overlay",
						Source: "overlay",
						Options: []string{
							"lowerdir={{ mount 1 }}:{{ mount 0 }}",
						},