Add switch for move-tables to main.go

Author: danieljoos

go/base/context.go

@@ -1039,6 +1039,11 @@ func (mctx *MigrationContext) CancelContext() {
 	}
 }
 
+// IsMoveTablesMode returns true if gh-ost should be used for moving tables instead of running a schema migration.
+func (mctx *MigrationContext) IsMoveTablesMode() bool {
+	return len(mctx.MoveTables.TableNames) > 0
+}
+
 // SendWithContext attempts to send a value to a channel, but returns early
 // if the context is cancelled. This prevents goroutine deadlocks when the
 // channel receiver has exited due to an error.

go/cmd/gh-ost/main.go

@@ -415,6 +415,8 @@ func main() {
 	var err error
 	if migrationContext.Revert {
 		err = migrator.Revert()
+	} else if migrationContext.IsMoveTablesMode() {
+		err = migrator.MoveTables()
 	} else {
 		err = migrator.Migrate()
 	}

go/logic/migrator.go

@@ -769,6 +769,10 @@ func (mgtr *Migrator) Revert() error {
 	return nil
 }
 
+func (mgtr *Migrator) MoveTables() error {
+	return nil
+}
+
 // ExecOnFailureHook executes the onFailure hook, and this method is provided as the only external
 // hook access point
 func (mgtr *Migrator) ExecOnFailureHook() (err error) {