add fat32 boot partition support

Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>

fs.go

@@ -0,0 +1,58 @@
+// Copyright 2023 Linka Cloud  All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package d2vm
+
+import (
+	"fmt"
+)
+
+type BootFS string
+
+const (
+	FSExt4  BootFS = "ext4"
+	FSFat32 BootFS = "fat32"
+)
+
+func (f BootFS) String() string {
+	return string(f)
+}
+
+func (f BootFS) IsExt() bool {
+	return f == FSExt4
+}
+
+func (f BootFS) IsFat() bool {
+	return f == FSFat32
+}
+
+func (f BootFS) IsSupported() bool {
+	return f.IsExt() || f.IsFat()
+}
+
+func (f BootFS) Validate() error {
+	if !f.IsSupported() {
+		fmt.Errorf("invalid boot filesystem: %s valid filesystems are: fat32, ext4", f)
+	}
+	return nil
+}
+
+func (f BootFS) linux() string {
+	switch f {
+	case FSFat32:
+		return "vfat"
+	default:
+		return "ext4"
+	}
+}