71 lines
1.8 KiB
Ruby
71 lines
1.8 KiB
Ruby
#
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# fact.rb
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#
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module Puppet::Parser::Functions
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newfunction(:fact, :type => :rvalue, :doc => <<-EOS
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This function will retrieve fact from Facter based on the fact
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name and expose it for further use within Puppet manifest file ...
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For example:
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Given the following sample manifest:
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define partitions {
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$result = split(fact("partitions_${name}"), ',')
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notice $result
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partition { $result: }
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}
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define partition {
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notice $name
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}
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$available_disks = split($disks, ',')
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partitions { $available_disks: }
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This will produce the following:
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notice: Scope(Partitions[hda]): hda1 hda2
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notice: Scope(Partition[hda1]): hda1
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notice: Scope(Partition[hda2]): hda2
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Which allows you to avoid resorting to the following:
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$fact = "partitions_${name}"
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$result = split(inline_template("<%= scope.lookupvar(fact) %>"), ',')
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Phasing out the need for use and abuse of the infamous inline_template
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in the partitions define given above.
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EOS
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) do |arguments|
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raise(Puppet::ParseError, "fact(): Wrong number of arguments " +
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"given (#{arguments.size} for 1)") if arguments.size < 1
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fact = arguments[0]
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raise(Puppet::ParseError, 'fact(): You must provide ' +
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'fact name') if fact.empty?
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fact = strinterp(fact) # Evaluate any interpolated variable names ...
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result = lookupvar(fact) # Get the value of interest from Facter ...
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if not result or result.empty?
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#
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# Now this is a funny one ... Puppet does not have a concept of
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# returning neither undef nor nil back for use within the Puppet DSL
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# and empty string is as closest to actual undef as you we can get
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# at this point in time ...
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#
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result = ''
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end
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return result
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end
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end
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# vim: set ts=2 sw=2 et :
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