Hi Michael,
We are also using double evaluation in many places - mostly to not repeat
definitions of the same variable
*Example 1*
user.yml - user uid values
userA: 800
userB: 801
main.yml - role variables
user: userA
user_uid: ${${user}} # will be resolved to 800
*Example 2*
type1_data:
var1: value1
var2: value1
type2_data:
var1: value2
var2: value2
type_data: ${${type}_data}
type_var1: ${type_data.var1}
type_var2: ${type_data.var2}
By overriding single variable we get different plays (all var blocks can be
defined in role and block selection can go to single var in vars_files)
This also allows command line override with -e option by passing just one
key=value.
What will be the appropriate way to use those after old syntax removed?
On Wednesday, December 4, 2013 4:26:54 AM UTC+3, Michael DeHaan wrote:
>
> Yeah this is a very outdated usage of legacy variables, and a bit of an
> anti-pattern whenever you want to define a variable by a variable name.
> (There's a reason even Perl tries to discourage this, and that's Perl).
>
> I don't know where you are defining "jobprofile", but can we step back and
> talk about the use case?
>
> Public service announcement, variables look like this:
>
> foo: "{{ bar }}"
>
> And if you want to get at a variable by name that is scoped to a host, you
> can do so if you want -- which you won't need often -- like so:
>
> {{ hostvars[inventory_hostname][fact_name] }}
>
> This doesn't of course apply to the host specifier -- we haven't even got
> to figure out what host we've talked to yet, hence I'm wanting to
> understand more.
>
> This seems like a case better suited to seperate inventory files, or the
> case of a dynamic inventory script, the dynamic inventory script responding
> to an environment variable.
>
>
>
>
> On Tue, Dec 3, 2013 at 2:17 AM, Giorgio Crivellari
> <miti...@gmail.com<javascript:>
> > wrote:
>
>> I used to use "hosts" property, in ansible playbook, dinamically for
>> example:
>>
>>> hosts: ${$jobprofile.hosts}
>>
>> where $jobprofile was an external variable that allow me to change hosts
>> based on profile.
>>
>> Since last 1.4 version, my previous playbook doesn't works any more.
>> Have you some suggestion to do an EVAL into a playbook?
>>
>> Thanks
>> Giorgio
>>
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>
>
> --
> Michael DeHaan <mic...@ansibleworks.com <javascript:>>
> CTO, AnsibleWorks, Inc.
> http://www.ansibleworks.com/
>
>
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