Issue #16390 has been updated by Andrew Parker.
Status changed from Unreviewed to Rejected
`foo` isn't a variable, it is actually a method call. You need to use
`defined?(@foo)`, `if @foo`, or `has_variable('foo')`. See
<http://docs.puppetlabs.com/guides/templating.html#referencing-variables>
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Bug #16390: defined?() does not work as intended in ERB templates
https://projects.puppetlabs.com/issues/16390#change-71067
Author: Timur Batyrshin
Status: Rejected
Priority: Normal
Assignee:
Category:
Target version:
Affected Puppet version:
Keywords:
Branch:
While trying to do search for a variable with `defined?` in ERB template we
always get `nil`:
<pre>
$ cat test.pp
$foo = 'bar'
$defined = inline_template("<%= defined?(foo).inspect %>")
$result = inline_template("<%= foo %>")
notice( "defined: ${defined}" )
notice( "result: ${result}" )
</pre>
<pre>
$ puppet apply test.pp
/usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in
`require': iconv will be deprecated in the future, use String#encode instead.
notice: Scope(Class[main]): defined: nil
notice: Scope(Class[main]): result: bar
notice: Finished catalog run in 0.14 seconds
$
</pre>
This prevents us from using constructions like `(defined?(options) &&
options['foo']) || "foo_default"` in ERB templates.
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