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@@ -161,7 +161,30 @@ Main {
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       end
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     end
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   end
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-  
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+
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+  mode "update" do
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+    mixin :standard_options
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+    mixin :revision_or_commit
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+
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+    argument("directory") { optional }
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+
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+    def run
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+      configure_logging!
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+
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+      if params["revision"].given? && params["commit"].given? then
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+        raise ArgumentError, "Only one of --revision or --commit can be given.  Received both."
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+      end
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+
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+      cmd = Piston::Commands::Update.new(:lock => params["lock"].value,
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+                                         :verbose => params["verbose"].value,
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+                                         :quiet => params["quiet"].value,
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+                                         :force => params["force"].value,
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+                                         :dry_run => params["dry-run"].value)
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+
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+      cmd.run(params["director"].value, target_revision)
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+    end
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+  end
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+
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   option("version", "v")
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   def run

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@@ -1,2 +1,3 @@
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 require "piston/commands/import"
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 require "piston/commands/lock_unlock"
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+require "piston/commands/update"