Puppet users - Apr 2014 - A file managed by puppet that is left alone if customized

Hi,

I'm managing workstations using puppet, and I was wondering if there's a
better way to do this:

$dir = inline_template('<%=ENV["HOME"]%>') 

define customizable_file($source=undef,$template=undef,$replacemd5='')
{
>     $tmplname = $template ? {
>         undef   => "$name.common",
>         default => "$template",
>     }
>     file { "$tmplname":
>         source => $source,
>     }
>     exec { "cp $tmplname $name":
>         onlyif  => "test ! -e $name -o \"$(md5sum $name|cut
-d' ' -f1)\" =
> \"$replacemd5\"",
>         path    => ['/bin', '/usr/bin'],
>         require => File["$tmplname"],
>     }
> }
> customizable_file { "$dir/foo-$::hostname":
>     source     => 'file:///etc/motd',
>     template   => "$dir/foo-common",
>     replacemd5 => 'e43e23c6d9a376bedd1ae405be4fdf97',
> }

What I want to achieve is a file that is managed by puppet, but if the user 
touches it, puppet stops touching the file. Normal file resource with 
replace doesn't cut it in this case. replacemd5 should be set to the md5 
sum of the previous version of the file. I'd really like to see a custom 
type for this, that would handle templating some nice way, or at least 
allow one to specify more that one md5sum of previous versions. Obviously 
this doesn't work well for files that change often.

So, is there a better way?

Cheers,
Paul

PS. $dir is set to home so that you can dump the contents to a file and 
puppet apply it to test.

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