Differentiate between creating a fresh container and recreating an already existing one.

dup.rb

@@ -120,14 +120,16 @@ def action_help
 	exit 1
 end
 
+def run_cmd(cmd, ignore_returnvalue=false, catch_interrupt=false, ignore_dry_run: false)
 	verbose "+ #{cmd}"
 	returnvalue=false
 	begin
-		returnvalue = $dry_run ? true : system("bash -c #{cmd.shellescape}")
+		returnvalue = ($dry_run && !ignore_dry_run) ? true : system("bash -c #{cmd.shellescape}")
 	rescue Interrupt
 		raise if not catch_interrupt
 	end
 	raise "Command returned a non-zero exit value." if returnvalue!=true && !ignore_returnvalue
+	return returnvalue
 end
 
 def esc(obj, escape=true)
@@ -203,6 +205,10 @@ class Container
 		@name = name
 	end
 	
+	def exists?
+		run_cmd("docker inspect --format='1' #{@name.shellescape} >/dev/null 2>&1", true, ignore_dry_run: true)
+	end
+	
 	def load
 		raise "File #{self.filename} not found." unless File.exists?(self.filename)
 
@@ -333,6 +339,12 @@ class Container
 			self.pull
 		end
 		
+		if self.exists?
+			puts "Recreating #{@name}..."
+		else
+			puts "Creating   #{@name}..."
+		end
+		
 		self.stop_and_remove
 		
 		self.create_networks