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