Puppet 3.2: add element to array

[Sergey Arlashin]

Hi!
Is it possible to add a new element to an array inside puppet manifest ? Something like ruby's array.push('new_element') ?

--
Best regards,
Sergey Arlashin

[Daniele Sluijters]

HI,

It should be possible to do something like this:

$users = [a,b,c]

$users += [d,e]

Or, $users = [[a,b,c] [d,e]] etc.

Perhaps a better question, what is it you're trying to do, exactly, that you need this?

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Daniele Sluijters

[jcbollinger]

On Monday, October 21, 2013 1:21:18 PM UTC-5, Sergey Arlashin wrote:

Hi!
Is it possible to add a new element to an array inside puppet manifest ? Something like ruby's array.push('new_element') ?

No, it isn't.  It is a fundamental principle of Puppet that variables' values cannot be changed once set.

In particular, the += operator Daniele refers to does not do quite what she supposes: it sets the initial value of a local variable by appending data to the value of a separate variable of the same name at top scope, node scope, or a parent scope (http://docs.puppetlabs.com/puppet/3/reference/lang_variables.html#appending-assignment).  That may be sufficient for your needs, but it is not what you actually asked, and I would not expect the code Daniele presented to work.


John

[Erik Dalén]

It is possible in a lot of puppet versions but it is a bug and might get fixed.

$a = [1,2]

$a[2]=3

notice($a)

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Erik Dalén

[Henrik Lindberg]

On 2013-24-10 11:19, Erik Dal�n wrote:
> It is possible in a lot of puppet versions but it is a bug and might get
> fixed.
>
> $a = [1,2]
> $a[2]=3
> notice($a)
>
>

It is a bug that is planned to be fixed in Puppet 4. (It cannot be
changed in the 3.x series as it would potentially be a breaking change).

Yes, we are serious about semver :-)

The future parser (and hence also in Puppet 4) allows concatenation of
array (and merge of hash) to a *new* variable otherwise variables are
strictly immutable.

Regards
- henrik

> On 22 October 2013 15:20, jcbollinger <John.Bo...@stjude.org

> <mailto:John.Bo...@stjude.org>> wrote:
>
>
>
> On Monday, October 21, 2013 1:21:18 PM UTC-5, Sergey Arlashin wrote:
>
> Hi!
> Is it possible to add a new element to an array inside puppet
> manifest ? Something like ruby's array.push('new_element') ?
>
>
>
> No, it isn't. It is a fundamental principle of Puppet that

> variables' values cannot be changed once set..

>
> In particular, the += operator Daniele refers to does not do quite
> what she supposes: it sets the initial value of a local variable by

> appending data to the value of a /separate/ variable of the same

> name at top scope, node scope, or a parent scope
> (http://docs.puppetlabs.com/puppet/3/reference/lang_variables.html#appending-assignment).
> That may be sufficient for your needs, but it is not what you
> actually asked, and I would not expect the code Daniele presented to
> work.
>
>
> John
>
> --
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> <mailto:puppet-users%2Bunsu...@googlegroups.com>.

> To post to this group, send email to puppet...@googlegroups.com

> <mailto:puppet...@googlegroups.com>.

> Visit this group at http://groups.google.com/group/puppet-users.
> For more options, visit https://groups.google.com/groups/opt_out.
>
>
>
>
> --

> Erik Dal�n