Fix and document the move command - fixes #334

* Don't attempt to use server side Move unless they are on the same Fs
  * Fix move in the presense of filters

docs/content/docs.md

@@ -108,6 +108,22 @@ extended explanation in the `copy` command above if unsure.
 If dest:path doesn't exist, it is created and the source:path contents
 go there.
 
+### move source:path dest:path ###
+
+Moves the source to the destination.
+
+If there are no filters in use this is equivalent to a copy followed
+by a purge, but may using server side operations to speed it up if
+possible.
+
+If filters are in use then it is equivalent to a copy followed by
+delete, followed by an rmdir (which only removes the directory if
+empty).  The individual file moves will be moved with srver side
+operations if possible.
+
+**Important**: Since this can cause data loss, test first with the
+--dry-run flag.
+
 ### rclone ls remote:path ###
 
 List all the objects in the the path with size and path.

fs/operations.go

@@ -354,7 +354,7 @@ func PairMover(in ObjectPairChan, fdst Fs, wg *sync.WaitGroup) {
 		Stats.Transferring(src)
 		if Config.DryRun {
 			Log(src, "Not moving as --dry-run")
-		} else if haveMover {
+		} else if haveMover && src.Fs().Name() == fdst.Name() {
 			// Delete destination if it exists
 			if pair.dst != nil {
 				err := dst.Remove()
@@ -600,8 +600,8 @@ func MoveDir(fdst, fsrc Fs) error {
 		return nil
 	}
 
-	// First attempt to use DirMover
-	if fdstDirMover, ok := fdst.(DirMover); ok && fsrc.Name() == fdst.Name() {
+	// First attempt to use DirMover if exists, same Fs and no filters are active
+	if fdstDirMover, ok := fdst.(DirMover); ok && fsrc.Name() == fdst.Name() && Config.Filter.InActive() {
 		err := fdstDirMover.DirMove(fsrc)
 		Debug(fdst, "Using server side directory move")
 		switch err {
@@ -623,7 +623,18 @@ func MoveDir(fdst, fsrc Fs) error {
 		ErrorLog(fdst, "Not deleting files as there were IO errors")
 		return err
 	}
+	// If no filters then purge
+	if Config.Filter.InActive() {
 		return Purge(fsrc)
+	}
+	// Otherwise remove any remaining files obeying filters
+	err = Delete(fsrc)
+	if err != nil {
+		return err
+	}
+	// and try to remove the directory if empty - ignoring error
+	_ = TryRmdir(fsrc)
+	return nil
 }
 
 // Check the files in fsrc and fdst according to Size and hash
@@ -849,18 +860,24 @@ func Mkdir(f Fs) error {
 	return nil
 }
 
-// Rmdir removes a container but not if not empty
-func Rmdir(f Fs) error {
+// TryRmdir removes a container but not if not empty.  It doesn't
+// count errors but may return one.
+func TryRmdir(f Fs) error {
 	if Config.DryRun {
 		Log(f, "Not deleting as dry run is set")
-	} else {
-		err := f.Rmdir()
+		return nil
+	}
+	return f.Rmdir()
+}
+
+// Rmdir removes a container but not if not empty
+func Rmdir(f Fs) error {
+	err := TryRmdir(f)
 	if err != nil {
 		Stats.Error()
 		return err
 	}
-	}
-	return nil
+	return err
 }
 
 // Purge removes a container and all of its contents

fs/operations_test.go

@@ -712,6 +712,7 @@ func TestServerSideMove(t *testing.T) {
 	fstest.CheckItems(t, fremoteMove, file2)
 
 	// Do server side move
+	fs.Stats.ResetCounters()
 	err = fs.MoveDir(fremoteMove, r.fremote)
 	if err != nil {
 		t.Fatalf("Server Side Move failed: %v", err)
@@ -721,6 +722,7 @@ func TestServerSideMove(t *testing.T) {
 	fstest.CheckItems(t, fremoteMove, file2, file1)
 
 	// Move it back again, dst does not exist this time
+	fs.Stats.ResetCounters()
 	err = fs.MoveDir(r.fremote, fremoteMove)
 	if err != nil {
 		t.Fatalf("Server Side Move 2 failed: %v", err)