How to check if file exists on client without using exec command?

[Stella]

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 !

[Juan Andres Ramirez]

One way:

$path

onlyif => "powershell.exe -ExecutionPolicy ByPass -command \"if (Test-Path ${path}) { exit 1;}  else { exit 0; }\""

if puppet get exit 0 this finish without any error, so the path exist.

for more info go powershell console and run command get-help test-path

[Felix Frank]

On 10/10/2014 09:17 PM, Stella wrote:
> 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.

Have you tried not specifying an "ensure" value?

file { '/path/to/file': content => 'foobar' }

This should only do anything if the file is there, because the resource
doesn't care about its ensure (i.e. existence) value.

Cheers,
Felix

[Carthik Sharma]

There isn't a built-in function, so I'd write a function, put it in lib/puppet/parser/functions in your module, enable pluginsync in puppet.conf (so the custom function get synced to the agents), and then use the function in the manifest.

Something as simple as:

require"puppet" 

module Puppet::Parser::Functions newfunction(:bueller, :type => :rvalue) do |args| 

  File.exists?(args[0])

end

might work. Improve as needed. Consult: https://docs.puppetlabs.com/guides/custom_functions.html.

Thanks!

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[Wil Cooley]

On Oct 11, 2014 2:14 AM, "Carthik Sharma" <car...@puppetlabs.com> wrote:
>
> There isn't a built-in function, so I'd write a function

Functions run on the master, not agent (unless you're using 'apply', like running masterless); you'd need a fact to test if the file exists on the agent side, which is easy to do with an external fact.

Ex: facter/facts.d/foo_exists.sh
#!/bin/sh
test -e /foo && echo "foo_exists=true"
:

Wil