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# Digs into the facts hash using dot-notation
#
# Example usage:
#
# fact('osfamily')
# fact('os.architecture')
#
# Array indexing:
#
# fact('mountpoints."/dev".options.1')
#
# Fact containing a "." in the name:
#
# fact('vmware."VRA.version"')
#
Puppet::Functions.create_function(:fact) do
dispatch :fact do
param 'String', :fact_name
end
def to_dot_syntax(array_path)
array_path.map do |string|
string.include?('.') ? %Q{"#{string}"} : string
end.join('.')
end
def fact(fact_name)
facts = closure_scope['facts']
# Transform the dot-notation string into an array of paths to walk. Make
# sure to correctly extract double-quoted values containing dots as single
# elements in the path.
path = fact_name.scan(/([^."]+)|(?:")([^"]+)(?:")/).map {|x| x.compact.first }
walked_path = []
path.reduce(facts) do |d, k|
return nil if d.nil? || k.nil?
case
when d.is_a?(Array)
begin
result = d[Integer(k)]
rescue ArgumentError => e
Puppet.warning("fact request for #{fact_name} returning nil: '#{to_dot_syntax(walked_path)}' is an array; cannot index to '#{k}'")
result = nil
end
when d.is_a?(Hash)
result = d[k]
else
Puppet.warning("fact request for #{fact_name} returning nil: '#{to_dot_syntax(walked_path)}' is not a collection; cannot walk to '#{k}'")
result = nil
end
walked_path << k
result
end
end
end
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