Copying a hash with changes

[Tom Limoncelli]

I want to copy a hash to a variable but change some settings along the way.

For example:

I have $haproxy::params::global_options (which is a hash) and I want
to create a copy with some changes.

I tried this:
$global_options = $haproxy::params::global_options += {
'log' => "${log_ip} local0",
}
But that gives me:
Error: Syntax error at '+='; expected '}' at ...

If I do:
$global_options = $haproxy::params::global_options
$global_options['log'] = "${log_ip} local0"
This gives me:
Error: Assigning to the hash 'global_options' with an existing key
'log' is forbidden

Suggestions?

Tom

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Skype: YesThatTom
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[Dan White]

Make a hash with the update in it and then merge them (needs stdlib)

Like this:

$new_hash = {

  'log' => "${log_ip} local0",

}

$global_options = merge ( $haproxy::params::global_options, $new_hash )

https://forge.puppetlabs.com/puppetlabs/stdlib#reference

• merge: Merges two or more hashes together and returns the resulting hash.

Example:

$hash1 = {'one' => 1, 'two' => 2}

$hash2 = {'two' => 'dos', 'three' => 'tres'}

$merged_hash = merge($hash1, $hash2)

# The resulting hash is equivalent to:

# $merged_hash =  {'one' => 1, 'two' => 'dos', 'three' => 'tres'}

When there is a duplicate key, the key in the rightmost hash "wins." Type: rvalue

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[Garrett Honeycutt]

On 2/28/15 1:27 PM, Tom Limoncelli wrote:
> I want to copy a hash to a variable but change some settings along the way.
>
> For example:
>
> I have $haproxy::params::global_options (which is a hash) and I want
> to create a copy with some changes.
>
> I tried this:
> $global_options = $haproxy::params::global_options += {
> 'log' => "${log_ip} local0",
> }
> But that gives me:
> Error: Syntax error at '+='; expected '}' at ...
>
> If I do:
> $global_options = $haproxy::params::global_options
> $global_options['log'] = "${log_ip} local0"
> This gives me:
> Error: Assigning to the hash 'global_options' with an existing key
> 'log' is forbidden
>
> Suggestions?
>
> Tom
>

Hi Tom,

Suggest using a template as it provides a way to hack around issues
involving munging data and types by going straight to ruby. You could
use the inline_template() function, though I prefer having it in a
separate file for readability and for syntax checking.

Here's a quick and dirty hack that might work for you. Notice in the
template that the ruby code is between <% %> and the interpolation that
is being returned to $hn in your manifest is between <%= %>.

manifests/init.pp

class tl (
) {

$h = {
'k' => 'v',
}

$hn = template('tl/hack.erb')

notify { 'asdf':
message => "h = ${h}",
}
notify { "hn = ${hn}":
require => Notify['asdf'],
}
}


# templates/hack.erb
<% ht = {}
ht = @h.merge 'log' => "#{@ipaddress} local0"%>
<%= ht %>

# puppet apply -v tests/init.pp
Notice: h = {"k"=>"v"}
Notice: hn =
{"k"=>"v", "log"=>"10.0.1.3 local0"}

Best regards,
-g

--
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@learnpuppet
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Mobile: +1.206.414.8658

[Henrik Lindberg]

On 2015-28-02 19:27, Tom Limoncelli wrote:
> I want to copy a hash to a variable but change some settings along the way.
>
> For example:
>
> I have $haproxy::params::global_options (which is a hash) and I want
> to create a copy with some changes.
>
> I tried this:
> $global_options = $haproxy::params::global_options += {
> 'log' => "${log_ip} local0",
> }

In Puppet 4.0 (and in 3x with parser=future) you can do this (i.e. merge
a hash) directly in the Puppet Language:

$global_options = $haproxy::params::global_options + {
'log' => "{log_ip} local0"
}


- henrik


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[Tom Limoncelli]

On Sat, Feb 28, 2015 at 2:25 PM, Dan White <d_e_...@icloud.com> wrote:

$new_hash = {

  'log' => "${log_ip} local0",

}

$global_options = merge ( $haproxy::params::global_options, $new_hash )

Thanks, Dan!  I'll do that while I wait for Puppet 4.0 (or when I can use the future parser).

 

On Sun, Mar 1, 2015 at 6:37 PM, Henrik Lindberg <henrik....@cloudsmith.com> wrote:

In Puppet 4.0 (and in 3x with parser=future) you can do this (i.e. merge a hash) directly in the Puppet Language:

$global_options = $haproxy::params::global_options + {
    'log' => "{log_ip} local0"
  }

Henrik, that's great!  I look forward to that addition to Puppet!

Tom