Wednesday, October 19, 2011

Puppet expansion of facts inside command strings requires double quoted string

Small gotcha for puppet facts. If you want a puppet fact to be expanded inside a quoted string you need to use double quotes (i.e. a ruby-style format string).
  exec { 'something':
    # This has to be a double quote for the fact to get expanded
    command     => "/usr/bin/something ${my_custom_fact}",
    refreshonly => 'true',

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