On 2014-07-02 21:55, John Bollinger wrote:
at the point where affected resources
are declared (for Lindberg-style defaults) or at the point where the
defaults themselves are declared (for Schmitt-style defaults, if I
understand that proposal correctly).
My proposal would actually collapse those two points: the values only
affect the resources declared in the same resource block as the values
themselves. I'll explain my example more:
No defaults:
file {
"/tmp/foo":
content => 'foo',
mode => 0321,
owner => weird;
"/tmp/bar":
content => 'bar',
mode => 0321,
owner => weird;
}
equivalent Schmitt-style shortcutting:
file {
# defaults block (no title!)
mode => 0321,
owner => weird;
# actual resources block (no mode, owner)
"/tmp/foo": content => 'foo';
"/tmp/bar": content => 'bar';
}
the weird owner and mode do not apply to any resources outside of this
File declaration.
The resulting resource would not remember whether the parameter value
was set directly (content in the example) or with a shortcut (mode,
owner).
Any way around, I think there will be a major upheaval when the scope
of
resource defaults changes. Would it at least be possible for their
scope
to continue to extend into defined type instances declared within
their
lexical scope? That would mitigate the problems a bit, without
causing any
unpredictable evaluation-order dependencies. That would also be
consistent
with how the metaparameters of a defined-type instance are forwarded
to the
resources it contains. The semantics of wrapper definitions will
otherwise
change significantly, yet subtly.
I can only remember *seeing* Defaults in modules when they leaked to
somewhere I didn't want them to. That's probably the root cause for my
idea of really restricting where the default values can go.
Regards, David
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