cache read performance improvements

pkg/provider/sftp/file.go

@@ -0,0 +1,34 @@
+// Copyright (C) 2022 Marius Schellenberger
+
+package sftp
+
+import (
+	"io/fs"
+
+	"github.com/pkg/sftp"
+)
+
+type file struct {
+	*sftp.File
+	fs *FS
+}
+
+func (f *file) ReadDir(_ int) (d []fs.DirEntry, err error) {
+	list, err := f.Readdir(0)
+	if err != nil {
+		return
+	}
+	d = make([]fs.DirEntry, len(list))
+	for i, v := range list {
+		d[i] = fs.FileInfoToDirEntry(v)
+	}
+	return
+}
+
+func (f *file) Readdir(_ int) ([]fs.FileInfo, error) {
+	return f.fs.client.ReadDir(f.Name())
+}
+
+func (file) Fd() uintptr {
+	return 0
+}