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#
# load_variables.rb
#
module Puppet::Parser::Functions
newfunction(:load_variables, :type => :statement, :doc => <<-EOS
This function will allow for loading variables from an external YAML
file and expose them for further use inside the Puppet manifest file ...
For example:
Given following content of the data.yaml file:
---
host1.example.com:
foo: bar
baz: quux
question: 42
host2.example.com:
abc: def
this: that
darth: vader
Then calling load_variables in Puppet manifest file as follows:
load_variables("/etc/puppet/data.yaml", $fqdn)
Will result in addition of variables $foo, $baz and $question
for matching host name as per the variable $fqdn ...
Another example which uses per-host file:
Given following content of the file data-host1.example.com.yaml:
---
foo: bar
Then when we call load_variables like this:
load_variables("/etc/puppet/data-${fqdn}.yaml")
This will result in a variable $foo being added and ready for use.
EOS
) do |arguments|
raise(Puppet::ParseError, "load_variables(): Wrong number of " +
"arguments given (#{arguments.size} for 2)") if arguments.size < 2
data = {}
file = arguments[0]
key = arguments[1] if arguments[1]
if File.exists?(file)
begin
data = YAML.load_file(file)
rescue => error
raise(Puppet::ParseError, "load_variables(): Unable to load data " +
"from the file `%s': %s" % file, error.to_s)
end
raise(Puppet::ParseError, "load_variables(): Data in the file `%s' " +
"is not a hash" % file) unless data.is_a?(Hash)
data = ((data[key] and data[key].is_a?(Hash)) ? data[key] : {}) if key
end
data.each do |param, value|
value = strinterp(value) # Evaluate any interpolated variable names ...
setvar(param, value)
end
end
end
# vim: set ts=2 sw=2 et :
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