Puppet code : Stop a service when a filesystem is not mounted

Say you do not want crond to run when /mnt filesystem is not mounted.

LOGIC

Is /mnt filesystem is mounted?
YES
     Ensure File resource created
     Notify crond service ( assuming cron service is defined)
NO
     Do not do anything

CODE

exec {

    '/bin/echo’:

    onlyif => '/bin/cat /proc/mounts | /bin/grep -q \' /mnt \'',

    require => File[‘cron_file'];

}

file { 'cron_file':

'/etc/cron.d/custom_crontab':

      ensure  => file,

      source  => 'puppet:///$module/$sub_module/custom_crontab',

      notify  => Service[crond],

      owner   => 'root',

      group   => 'root',

      mode    => '0644';

}

Refer : this discussion