Puppet users - Mar 2014 - How to check if a service Or a Package exists

Hi All,

I need to check if a service or a package is already installed before 
running the further code.

Eg:

Install bigfix package if bigfix service dose not exist.

i know ensure => true will do this, but there is a possibility that bigfix 
was installed from the source in c:\bigfix on few server and on few its 
installed as a msi and i can see it under add remove programs.

So the best way is to check if the bigfix service exists or not, if exist 
ignore if not install via puppet.

Any pointers ?

-Kaustubh

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