Let's say I have a very simple template
template.erb:
<% if not has_variable?("foobar") then foobar = "undefined" end -%>
foobar: <%= foobar %>
class: <%= foobar.class %>
And a basic manifest:
template.pp:
$mytemp = template('template.erb')
notice($mytemp)
And then I apply the manifest, with an undefined foobar (no foobar fact):
$ puppet apply ~/template.pp
notice: Scope(Class[main]): foobar: undefined
class: String
notice: Finished catalog run in 0.01 seconds
Looking good. So now I apply the manifest, but with a defined value
for foobar (via the FACTER_FOOBAR environment variable):
$ FACTER_FOOBAR='foo' puppet apply ~/template.pp
notice: Scope(Class[main]): foobar:
class: NilClass
notice: Finished catalog run in 0.01 seconds
Er, what? How on earth did foobar go from a String to NilClass? I
can't fathom how this is expected, or correct...
The reason I was doing this sort of thing is to give a possibly
missing fact a default value. I ended up using a second variable, like
this:
<% foo = has_variable?("foobar") ? foobar.to_s : "false" -%>
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