Assigning one variable to another

[James Perrin]

Hi,

I want to ask what is the correct syntax for assigning one variable to another? I wish to do this in roles/for/vars/main.yml.

It should be something like:

  ip_address: {{ static_ip_address }}


but I think I've read somewhere that yml requires quotes around the template:

  ip_address: "{{ static_ip_address }}"

is this correct?


Thanks
James

[Serge van Ginderachter]

On 20 May 2014 12:01, James Perrin <james....@googlemail.com> wrote:

but I think I've read somewhere that yml requires quotes around the template:

  ip_address: "{{ static_ip_address }}"

is this correct?

​Yes. Without the quoting, yaml interprets this as a hash.​

[Petros Moisiadis]

Playbooks must be valid YAML, so, quotes are needed since you cannot _start_ a YAML string with a curly brace '{' character, because that character is used to define YAML dictionaries. If you were to use the var in the middle of a string though you would not need to use quotes. For example, the following syntax is correct:

welcome_message: Hello {{ name }}

Thanks
James

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[Andrew Pashkin]

Another use-case.
Say I have two of variables:

newrelic_license_key: null
newrelic_environment: null
newrelic: no

And if I need to test if there is need to install newrelic on a server I need to write this:

when: newrelic and newrelic_license_key is not none and newrelic_environment is not none

I would prefer to do this:

newrelic_license_key: null
newrelic_environment: null
newrelic: no
use_newrelic: {{ newrelic and newrelic_license_key is not none and newrelic_environment is not none }}

And then use use_newrelic in all conditional statements.

There is a workaround for this: wrap use_newrelic value to quotes and then check it in that way: use_newrelic == "True"

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With kind regards, Andrew Pashkin.
cell phone - +7 (985) 898 57 59
Skype - waves_in_fluids
e-mail - andrew....@gmx.co.uk