Add Root() to Fs interface

drive/drive.go

@@ -160,6 +160,11 @@ func (f *FsDrive) Name() string {
 	return f.name
 }
 
+// The root of the remote (as passed into NewFs)
+func (f *FsDrive) Root() string {
+	return f.root
+}
+
 // String converts this FsDrive to a string
 func (f *FsDrive) String() string {
 	return fmt.Sprintf("Google drive root '%s'", f.root)

dropbox/dropbox.go

@@ -114,6 +114,11 @@ func (f *FsDropbox) Name() string {
 	return f.name
 }
 
+// The root of the remote (as passed into NewFs)
+func (f *FsDropbox) Root() string {
+	return f.root
+}
+
 // String converts this FsDropbox to a string
 func (f *FsDropbox) String() string {
 	return fmt.Sprintf("Dropbox root '%s'", f.root)

fs/fs.go

@@ -70,6 +70,9 @@ type Fs interface {
 	// The name of the remote (as passed into NewFs)
 	Name() string
 
+	// The root of the remote (as passed into NewFs)
+	Root() string
+
 	// String returns a description of the FS
 	String() string
 

fs/limited.go

@@ -26,6 +26,11 @@ func (f *Limited) Name() string {
 	return f.fs.Name() // return name of underlying remote
 }
 
+// The root of the remote (as passed into NewFs)
+func (f *Limited) Root() string {
+	return f.fs.Root() // return root of underlying remote
+}
+
 // String returns a description of the FS
 func (f *Limited) String() string {
 	return fmt.Sprintf("%s limited to %d objects", f.fs.String(), len(f.objects))

googlecloudstorage/googlecloudstorage.go

@@ -149,6 +149,14 @@ func (f *FsStorage) Name() string {
 	return f.name
 }
 
+// The root of the remote (as passed into NewFs)
+func (f *FsStorage) Root() string {
+	if f.root == "" {
+		return f.bucket
+	}
+	return f.bucket + "/" + f.root
+}
+
 // String converts this FsStorage to a string
 func (f *FsStorage) String() string {
 	if f.root == "" {

local/local.go

@@ -77,6 +77,11 @@ func (f *FsLocal) Name() string {
 	return f.name
 }
 
+// The root of the remote (as passed into NewFs)
+func (f *FsLocal) Root() string {
+	return f.root
+}
+
 // String converts this FsLocal to a string
 func (f *FsLocal) String() string {
 	return fmt.Sprintf("Local file system at %s", f.root)

s3/s3.go

@@ -158,6 +158,14 @@ func (f *FsS3) Name() string {
 	return f.name
 }
 
+// The root of the remote (as passed into NewFs)
+func (f *FsS3) Root() string {
+	if f.root == "" {
+		return f.bucket
+	}
+	return f.bucket + "/" + f.root
+}
+
 // String converts this FsS3 to a string
 func (f *FsS3) String() string {
 	if f.root == "" {

swift/swift.go

@@ -81,6 +81,14 @@ func (f *FsSwift) Name() string {
 	return f.name
 }
 
+// The root of the remote (as passed into NewFs)
+func (f *FsSwift) Root() string {
+	if f.root == "" {
+		return f.container
+	}
+	return f.container + "/" + f.root
+}
+
 // String converts this FsSwift to a string
 func (f *FsSwift) String() string {
 	if f.root == "" {