Interpolating concatenated variables

[James Morgan]

Hi,

I'd like to be able to build a variable name programatically in a similar fashion to

http://docs.ansible.com/faq.html#how-do-i-access-a-variable-name-programmatically

Instead of accessing a dict I would like to build up the variable name. For example

- hosts: localhost

  connection: local

  vars:

    test_app: admin

    admin_port: 1234

  tasks:

    - debug:

        msg: "Admin port = {{ test_app + '_port' }}"

This outputs

TASK: [debug ] **************************************************************** 

ok: [localhost] => {

    "msg": "Admin port = admin_port"

}

I would like to get the value of admin_port. So would need to do some kind of double substitution. 

I need to get the information from a var file just given the app_name. The above is just to demonstrate.

Many thanks

James

[rek...@voodoowarez.com]

On Wed, Nov 05, 2014 at 08:06:41AM -0800, James Morgan wrote:
> Hi,
>
> I'd like to be able to build a variable name programatically in a similar
> fashion to
>
> http://docs.ansible.com/faq.html#how-do-i-access-a-variable-name-programmatically
>
> Instead of accessing a dict I would like to build up the variable name. For
> example
>
> - hosts: localhost
> connection: local
> vars:
> test_app: admin
> admin_port: 1234
> tasks:
> - debug:
> msg: "Admin port = {{ test_app + '_port' }}"
>
> This outputs
>
> TASK: [debug ]
> ****************************************************************
> ok: [localhost] => {
> "msg": "Admin port = admin_port"
> }
>

> I would like to get the value of *admin_port*. So would need to do some
> kind of double substitution.

{{ hostvars[inventory_hostname][test_app + '_port'] }} i think

[James Morgan]

Ok that doesn't work in my example as the variables aren't in the inventory

TASK: [debug ] **************************************************************** 

fatal: [localhost] => One or more undefined variables: 'dict' object has no attribute 'admin_port'

Though If use include_vars which I would be doing its does work

- hosts: localhost

  connection: local

  vars:

    test_app: admin

  tasks:

    - include_vars: concat_vars.yml

    - debug:

        msg: "admin port from inventory = {{ hostvars[inventory_hostname][test_app+'_port'] }}"

TASK: [debug ] **************************************************************** 

ok: [localhost] => {

    "msg": "admin port from inventory = 1234"

}

Many thanks for your help. This forum is fantastic.

James

[rek...@voodoowarez.com]

On Wed, Nov 05, 2014 at 08:56:59AM -0800, James Morgan wrote:
> Ok that doesn't work in my example as the variables aren't in the inventory

The other cache for facts: vars[test_app + '_port']

(PITA, this)

[James Morgan]

Ah thanks for the info.

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