option.pp

define automaster::option ($mountpoint, $value, $file='/etc/auto.master', $ensure='present') {
   case $ensure {
     present: {
       augeas {"Set auto.master option ${name} on mountpoint ${mountpoint}":
         context => "/files${file}",
         changes => "set *[. = '${mountpoint}']/opt[. = '${name}'] '$value'",
       }
     }
     absent: {
       augeas {"Remove auto.master option ${name} on mountpoint ${mountpoint}":
         context => "/files${file}",
         changes => "rm *[. = '${mountpoint}']/opt[. = '${name}']",
       }
     }
     default: { fail("Wrong value for ensure: ${ensure}") }
   }
}