Added mapping auto_update to set the label for watchtower or pyouroboros or whatever.

dup.rb

@@ -31,7 +31,7 @@ MAPPINGS = [
 	['working_dir', '--workdir', lambda{|c,i| (wd=c.Config.WorkingDir) == i.Config.WorkingDir ? nil : wd}],
 	['init', '--init', lambda{|c,i| c.Config.Init}, {:type=>:switch}],
 	['image', nil, lambda{|c,i| c.Config.Image}],
-	['command', nil, lambda{|c,i| (cmd=c.Config.Cmd.join(" ") rescue nil) == (i.Config.Cmd.join(" ") rescue nil)? nil : cmd}, {:escape=>false}]
+	['auto_update', nil, nil, {type: :hidden}]
 ]
 
 
@@ -225,22 +225,30 @@ class Container
 	
 	def filename; "%s/%s.yml" % [$base_dir, @name]; end
 	
+	def add_label(key, value)
+		if @data["labels"].is_a? Array
+			@data["labels"] << "#{key}=#{value}"
+		elsif @data["labels"].is_a? Hash
+			@data["labels"][key] = value
+		else
+			raise "data['labels'] is of an unexpected type: #{@data["labels"].class}"
+		end
+	end
+	
 	def build_run_command
 		$net_host = true if @data["net"]=="host"
 		cmd = ["docker", "create"]
 		cmd << "--net" << @data["networks"][0] if @data["networks"] && @data["networks"].count>0 && !$net_host
 		cmd << "--net" << "host" if $net_host
 		
+		@data["labels"] ||= []
+		
 		if !@data["test"]
-			if @data["labels"]==nil
-				@data["labels"] = ["de.fabianonline.dup=true"]
-			elsif @data["labels"].is_a? Array
-				@data["labels"] << "de.fabianonline.dup=true"
-			elsif @data["labels"].is_a? Hash
-				@data["labels"]["de.fabianonline.dup"] = "true"
-			else
-				raise "data['labels'] is of an unexpected type: #{@data["labels"].class}"
+			add_label("de.fabianonline.dup", "true")
 			end
+
+		if @data["auto_update"]
+			add_label("com.centurylinklabs.watchtower.enable", "true")
 		end
 
 		MAPPINGS.each do |mapping|