implemented os file interface acstraction

pkg/provider/interface.go

@@ -0,0 +1,45 @@
+// Copyright (C) 2022 Marius Schellenberger
+
+package provider
+
+import (
+	"io/fs"
+	"os"
+)
+
+type FS interface {
+	Stat(string) (fs.FileInfo, error)
+	Remove(string) error
+	Open(string) (File, error)
+	OpenFile(string, int, os.FileMode) (File, error)
+	MkdirAll(string, os.FileMode) error
+	Root() string
+	Fstat(uintptr) (int64, error)
+}
+
+type walk struct {
+	fs FS
+}
+
+func (w *walk) Open(p string) (fs.File, error) {
+	return w.fs.Open(p)
+}
+
+func WalkFS(fs FS) fs.FS {
+	return &walk{fs}
+}
+
+type File interface {
+	Name() string
+	Stat() (fs.FileInfo, error)
+	Truncate(int64) error
+	Sync() error
+	Fd() uintptr
+	ReadDir(int) ([]fs.DirEntry, error)
+	Read([]byte) (int, error)
+	ReadAt([]byte, int64) (int, error)
+	WriteAt([]byte, int64) (int, error)
+	Seek(int64, int) (int64, error)
+	Readdir(int) ([]fs.FileInfo, error)
+	Close() error
+}