Issue #7598 has been updated by Daniel Pittman.
I cannot think of any rational way that this could work as desired. If the
example was written *without* the extra set of quotes around the array it would
absolutely do the right thing, but with them? Madness lies down this path.
Specifically, what should these do?
$array = ["one", "two"]
file { "/tmp/${array}": }
file { "/tmp/foo": content => "$array" }
file { "/tmp/bar": content => "foo $array bar" }
The most coherent reading of this request I can see is "when an array variable
is substituted into a string, behave instead like this construct:
"foo $array1 $array2 ... $arrayN bar"
=>
$result = []
for $a in $array1 do
for $b in $array2 do
# ...
for $N in $arrayN do
$result += "foo $a $b ... $N bar"
end
end
end
In other words, you end up with an implicit loop around the string expansion,
returning an array of strings. Which then behave exactly like an array of
strings in that position would.
(Which, incidentally, can radically change the semantics of a string expansion
when the content of a variable changes. Imagine if we change Facter to return
an array in place of a scalar in some value, or worse, some random hardware or
software change on the system does that... :)
----------------------------------------
Feature #7598: Unpack array variables in string interpolation
https://projects.puppetlabs.com/issues/7598
Author: Randall Hansen
Status: Investigating
Priority: Normal
Assignee:
Category:
Target version:
Affected Puppet version:
Keywords: puppetcamp-eu-2011
Branch:
If your goal is this (pseudo-code):
@file { "host_one" }
@file { "host_two" }
You should be able to say this:
$array = [ "one", "two" ]
@file { "host_$array" }
Instead of this:
@file { "host_one", "host_two" }
--
*This ticket is a request for comment, coming out of a discussion at Puppet
Camp EU, 2011. No promises whatever about implementation, but there were
enough people interested to open a public discussion.*
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