def knife_ssh
ssh = Chef::Knife::Ssh.new
ssh.ui = ui
ssh.name_args = [ server_name, ssh_command ]
ssh.config[:ssh_user] = Chef::Config[:knife][:ssh_user] || config[:ssh_user]
ssh.config[:ssh_password] = config[:ssh_password]
ssh.config[:ssh_port] = Chef::Config[:knife][:ssh_port] || config[:ssh_port]
ssh.config[:ssh_gateway] = Chef::Config[:knife][:ssh_gateway] || config[:ssh_gateway]
ssh.config[:identity_file] = Chef::Config[:knife][:identity_file] || config[:identity_file]
ssh.config[:manual] = true
ssh.config[:host_key_verify] = Chef::Config[:knife][:host_key_verify] || config[:host_key_verify]
ssh.config[:on_error] = :raise
ssh
end