windows root: add stat for '/'

Author: powellnorma

server.go

@@ -217,7 +217,7 @@ func handlePacket(s *Server, p orderedRequest) error {
 		}
 	case *sshFxpLstatPacket:
 		// stat the requested file
-		info, err := os.Lstat(s.toLocalPath(p.Path))
+		info, err := s.lstat(s.toLocalPath(p.Path))
 		rpkt = &sshFxpStatResponse{
 			ID:   p.ID,
 			info: info,
@@ -291,7 +291,7 @@ func handlePacket(s *Server, p orderedRequest) error {
 	case *sshFxpOpendirPacket:
 		lp := s.toLocalPath(p.Path)
 
-		if stat, err := os.Stat(lp); err != nil {
+		if stat, err := s.stat(lp); err != nil {
 			rpkt = statusFromError(p.ID, err)
 		} else if !stat.IsDir() {
 			rpkt = statusFromError(p.ID, &os.PathError{

server_posix.go

@@ -11,3 +11,11 @@ import (
 func (s *Server) openfile(path string, flag int, mode fs.FileMode) (file, error) {
 	return os.OpenFile(path, flag, mode)
 }
+
+func (s *Server) lstat(name string) (os.FileInfo, error) {
+	return os.Lstat(name)
+}
+
+func (s *Server) stat(name string) (os.FileInfo, error) {
+	return os.Stat(name)
+}

server_windows.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+	"time"
 
 	"golang.org/x/sys/windows"
 )
@@ -157,3 +158,34 @@ func (s *Server) openfile(path string, flag int, mode fs.FileMode) (file, error)
 	}
 	return os.OpenFile(path, flag, mode)
 }
+
+type winRootFileInfo struct {
+	fs.FileInfo
+	name string
+}
+
+func (w winRootFileInfo) Name() string       { return w.name }
+func (w winRootFileInfo) Size() int64        { return 0 }
+func (w winRootFileInfo) Mode() fs.FileMode  { return fs.ModeDir | 0555 } // read+execute for all
+func (w winRootFileInfo) ModTime() time.Time { return time.Time{} }
+func (w winRootFileInfo) IsDir() bool        { return true }
+func (w winRootFileInfo) Sys() interface{}   { return nil }
+
+// Create a new root FileInfo
+var rootFileInfo = winRootFileInfo{
+	name: "/",
+}
+
+func (s *Server) lstat(name string) (os.FileInfo, error) {
+	if name == `\\.\` && s.winRoot {
+		return rootFileInfo, nil
+	}
+	return os.Lstat(name)
+}
+
+func (s *Server) stat(name string) (os.FileInfo, error) {
+	if name == `\\.\` && s.winRoot {
+		return rootFileInfo, nil
+	}
+	return os.Stat(name)
+}