verify before deploy

so I have this sudo module that I've been working on:

class auth::sudo {

    package { sudo: ensure => installed }

    file { sudo_config:

        name    => "/tmp/sudoers",

        owner   => "root",

        group   => "root",

        mode    => 0440,

        notify  => Exec["sudoers-syntax"],

        source  => [

            "puppet:///auth/sudo/${fqdn}/sudoers",

            "puppet:///auth/sudo/sudoers"

        ]

    }

    exec { "sudoers-syntax":

        command         => "/bin/cp /tmp/sudoers /etc/sudoers",

        onlyif          => "/usr/sbin/visudo -c /tmp/sudoers",

        refreshonly     => true,

    }

}

it works very well but I'm wondering if there is another way (cleaner perhaps) to use an external command to verfiy a file prior to deployment.  Is there way to access a potential file before it's deployed?  Or get at the previous version if something doesn't pass a sniff test.

C

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