Puppet 无法挂载 CIFS 共享

我有一个用于挂载 CIFS 共享的 Puppet 模块。puppetmaster 和代理都在运行 SLES 11。

mount 使用以下命令手动工作：

mount.cifs //servername/path/to/share /opt/some/dir -o auto,credentials=/root/.smbcred

但是当 puppet 尝试挂载它时，它失败了：

hostname:~ # puppet agent --test --verbose
notice: /Stage[main]/module_name/Mount[/opt/some/dir]/ensure: defined 'ensure' as 'mounted'
err: /Stage[main]/module_name/Mount[/opt/some/dir]: Could not evaluate: Field 'device' is required

这是模块的 init.pp 的相关部分：

file { "/opt/some/dir":
    ensure => directory,
}

file { "/root/.smbcred":
    owner   => root,
    group   => root,
    mode    => 0644,
    ensure  => present,
    content =>  "user=username\npass=password\ndomain=$domain\n",
}

mount {"/opt/some/dir":
    device => "//servername/path/to/share",
    name => "/opt/some/dir",
    atboot => "true",
    ensure => "mounted",
    fstype => "cifs",
    options => "auto,credentials=/root/.smbcred",
    require => [ File["/root/.smbcred"], File["/opt/some/dir"] ],
}

凭据文件确实被写入，并且目录确实被创建。但是安装失败了。有任何想法吗？