Puppet users - Oct 2014 - How to check if file exists on client without using exec command?

Hi all,

I am using Puppet 3.6.2. I am trying to write a puppet module, which will 
replace a file with source template ONLY IF this file already exists. If 
this file doesn't exist, don't do anything. 

I have got it to work with the "exec" command, but that requires to
use
some command/script outside of Puppet. 
I want to find out if Puppet has any built-in function to achieve this 
purpose? 
I tried with "replace", but "replace" will create the file
if the file
doesn't exist. That's not I want.

Here is the example "exec" code:

  exec {'command when file exists':
    command         => "command to solve the problem",
    user            => root,
    onlyif          => "test -f /path/to/file",
    path            =>
['/usr/bin','/usr/sbin','/bin','/sbin'],
    notify          => Notify['/path/to/file  found'],         
  }

  notify {'/path/to/file not found': }


Thanks a lot !

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