lib/model: Create root directory for paused folders (fixes #4094)

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4095

lib/model/model.go

@@ -231,18 +231,9 @@ func (m *Model) startFolderLocked(folder string) config.FolderType {
 
 		// Directory permission bits. Will be filtered down to something
 		// sane by umask on Unixes.
-		permBits := os.FileMode(0777)
-		if runtime.GOOS == "windows" {
-			// Windows has no umask so we must chose a safer set of bits to
-			// begin with.
-			permBits = 0700
-		}
 
-		if _, err := os.Stat(cfg.Path()); os.IsNotExist(err) {
-			if err := osutil.MkdirAll(cfg.Path(), permBits); err != nil {
-				l.Warnln("Creating folder:", err)
-			}
-		}
+		cfg.CreateRoot()
+
 		if err := cfg.CreateMarker(); err != nil {
 			l.Warnln("Creating folder marker:", err)
 		}
@@ -2385,6 +2376,7 @@ func (m *Model) CommitConfiguration(from, to config.Configuration) bool {
 			// A folder was added.
 			if cfg.Paused {
 				l.Infoln(m, "Paused folder", cfg.Description())
+				cfg.CreateRoot()
 			} else {
 				l.Infoln(m, "Adding folder", cfg.Description())
 				m.AddFolder(cfg)