Added --list to list all known container names.

dup.rb

@@ -163,6 +163,31 @@ def action_run(container, file)
 	end
 end
 
+def action_list(base_dir)
+	errors = []
+	Dir[File.join(base_dir, "*.yml")].sort.each do |file|
+		basename = File.basename(file)[0..-5]
+		yaml = File.open(file, "r") {|f| YAML.load(f.read)}
+		keys = yaml.keys
+		
+		if keys.include? basename
+			puts basename
+			keys.each {|k| puts " + #{k}" unless k==basename}
+		else
+			errors << "#{file}:\n    Missing a key called #{basename}\n    Has keys:\n#{keys.map{|k| "        #{k}"}.join("\n")}"
+		end
+	end
+	
+	if !errors.empty?
+		puts
+		puts "ERRORS:"
+		puts errors.join("\n\n")
+		exit 1
+	end
+	
+	exit 0
+end
+
 action = :run
 container = nil
 $dry_run = false
@@ -175,7 +200,8 @@ opts = GetoptLong.new(
 	[ '--create', '-c', GetoptLong::NO_ARGUMENT ],
 	[ '--help', '-h', GetoptLong::NO_ARGUMENT ],
 	[ '--dry-run', '-n', GetoptLong::NO_ARGUMENT ],
-	[ '--pull', '-p', GetoptLong::NO_ARGUMENT ]
+	[ '--list', '-l', GetoptLong::NO_ARGUMENT ],
+	[ '--pull', '-p', GetoptLong::NO_ARGUMENT ],
 )
 
 opts.each do |opt, arg|
@@ -190,6 +216,9 @@ opts.each do |opt, arg|
 		when '--dry-run'
 			puts "Dry-run. Not going to execute any command."
 			$dry_run = true
+		when '--list'
+			action = :list
+			needs_container = false
 		when '--pull'
 			$pull = true
 	end
@@ -216,6 +245,8 @@ if action == :create
 	action_create(container, file)
 elsif action == :run
 	action_run(container, file)
+elsif action == :list
+	action_list(base_dir)
 end