hand dirCacheTime through again

cmd/mountlib/fs.go

@@ -35,11 +35,12 @@ var (
 
 // FS represents the top level filing system
 type FS struct {
-	f          fs.Fs
-	root       *Dir
-	noSeek     bool // don't allow seeking if set
-	noChecksum bool // don't check checksums if set
-	readOnly   bool // if set FS is read only
+	f            fs.Fs
+	root         *Dir
+	noSeek       bool          // don't allow seeking if set
+	noChecksum   bool          // don't check checksums if set
+	readOnly     bool          // if set FS is read only
+	dirCacheTime time.Duration // how long to consider directory listing cache valid
 }
 
 // NewFS creates a new filing system and root directory
@@ -57,6 +58,13 @@ func NewFS(f fs.Fs) *FS {
 	return fsys
 }
 
+// SetDirCacheTime allows to set how long a directory listing is considered
+// valid. Set to 0 always request a fresh version from the remote.
+func (fsys *FS) SetDirCacheTime(dirCacheTime time.Duration) *FS {
+	fsys.dirCacheTime = dirCacheTime
+	return fsys
+}
+
 // PollChanges will poll the remote every pollInterval for changes if the remote
 // supports it. If a non-polling option is used, the given time interval can be
 // ignored