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How do I access an environment variable (from the puppet daemon's environment) in a puppet manifest?

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Do you mean a variable generated by facter? –  Scott Pack Mar 30 '10 at 0:49
    
I mean the bash environment variables like $PATH and $USER. –  joeforker Mar 30 '10 at 12:44

5 Answers 5

I think we need more informations on what you are trying to achieve... Facter exposes by default FACTER_ environment variables :

http://docs.reductivelabs.com/guides/faq.html#can_i_access_environmental_variables_with_facter

 $ FACTER_FOO="bar" 
 $ export FACTER_FOO
 $ facter | grep 'foo'
   foo => bar

But for $PATH or $USER... Why not tells puppet to use a given path or a user (for an exec ?) explicitly ?

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It's very ordinary to control an interpreter with environment variables, for a variety of reasons... especially if you think about sometimes running puppet as an interpreter (in the #! line?) instead of a daemon... –  joeforker Mar 31 '10 at 19:29
    
Excellent answer. I wasted a lot of time not noticing that all Facter variables have lowercase names even if the environment variable has an uppercase name. Everybody pay close attention to the example jnrg gives. –  Russell Silva Jan 15 '13 at 17:00
1  
there is broken link –  kenorb Jun 9 at 12:10

From what I can tell Puppet runs without any Bash environment variables. It seems to get all its environment from Facter. There is a script here to import your regular envvars as Facter envvars.

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You'd need to use a server side function for this if you want the puppetmaster's environment. Since facter gets you client facts.

$RUBYLIB/puppet/parser/functions/env.rb:

module Puppet::Parser::Functions
  newfunction(:env) do |args|
    variable = args[0]
    ENV[variable]
  end
end

Use it in your manifests like:

$blah = env("PATH")
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In Puppet enterprise 2.5.1 you can access it via /etc/env.

Also check whether you have the correct environment defined in your /etc/puppetlabs/puppet/puppet.conf -- it should look something like this:

[production]
  modulepath = /etc/puppetlabs/puppet/environments/production/modules:/opt/puppet/share/puppet/modules
  manifest   = /etc/puppetlabs/puppet/environments/production/manifests/site.pp
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The answer is a bit disappointing: You can't (unless you enhance Puppet or Facter). I recently wrote a short blog post about this topic: Accessing environment variables within Puppet

A short summary: Facter is running on every Puppet agent system. Simply enhance Facter to collect all environment variables and then you can access them within Puppet manifests.

Hope that helps!

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