def find_servers(options={})
hosts = server_list_from(ENV['HOSTS'] || options[:hosts])
roles = role_list_from(ENV['ROLES'] || options[:roles] || self.roles.keys)
only = options[:only] || {}
except = options[:except] || {}
if hosts.any?
hosts.uniq
else
servers = roles.inject([]) { |list, role| list.concat(self.roles[role]) }
servers = servers.select { |server| only.all? { |key,value| server.options[key] == value } }
servers = servers.reject { |server| except.any? { |key,value| server.options[key] == value } }
servers.uniq
end
end