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# Test whether a given class or definition is defined
Puppet::Parser::Functions::newfunction(:defined, :type => :rvalue, :doc => "Determine whether
a given class or resource type is defined. This function can also determine whether a
specific resource has been declared. Returns true or false. Accepts class names,
type names, and resource references.
The `defined` function checks both native and defined types, including types
provided as plugins via modules. Types and classes are both checked using their names:
defined(\"file\")
defined(\"customtype\")
defined(\"foo\")
defined(\"foo::bar\")
Resource declarations are checked using resource references, e.g.
`defined( File['/tmp/myfile'] )`. Checking whether a given resource
has been declared is, unfortunately, dependent on the parse order of
the configuration, and the following code will not work:
if defined(File['/tmp/foo']) {
notify(\"This configuration includes the /tmp/foo file.\")
}
file {\"/tmp/foo\":
ensure => present,
}
However, this order requirement refers to parse order only, and ordering of
resources in the configuration graph (e.g. with `before` or `require`) does not
affect the behavior of `defined`.") do |vals|
result = false
vals = [vals] unless vals.is_a?(Array)
vals.each do |val|
case val
when String
if Puppet::Type.type(val) or find_definition(val) or find_hostclass(val)
result = true
break
end
when Puppet::Resource
if findresource(val.to_s)
result = true
break
end
else
raise ArgumentError, "Invalid argument of type '#{val.class}' to 'defined'"
end
end
result
end
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