Invoking the shell module is not necessary. One can use jinja2. An example:
$ cat a.yaml
- hosts: localhost
tasks:
- set_fact: A="5"
- set_fact: B="6"
- set_fact: C="{{ A|int - B|int }}"
- debug: var=C
$ ansible-playbook -v a.yaml
No config file found; using defaults
[WARNING]: Host file not found: /etc/ansible/hosts
[WARNING]: provided hosts list is empty, only localhost is available
PLAY [localhost]
****************************************************************************************************************************************************************************
TASK [Gathering Facts]
**********************************************************************************************************************************************************************
ok: [localhost]
TASK [set_fact]
*****************************************************************************************************************************************************************************
ok: [localhost] => {"ansible_facts": {"A": "5"}, "changed": false}
TASK [set_fact]
*****************************************************************************************************************************************************************************
ok: [localhost] => {"ansible_facts": {"B": "6"}, "changed": false}
TASK [set_fact]
*****************************************************************************************************************************************************************************
ok: [localhost] => {"ansible_facts": {"C": "-1"}, "changed": false}
TASK [debug]
********************************************************************************************************************************************************************************
ok: [localhost] => {
"C": "-1",
"changed": false
}
PLAY RECAP
**********************************************************************************************************************************************************************************
localhost : ok=5 changed=0 unreachable=0 failed=0
On Tue, Feb 14, 2017 at 9:58 PM, DHAVAL JAISWAL <[email protected]> wrote:
> - name: Set the output of the this state
> set_fact: A="{{image_avl.stdout}}" -- this is coming from the
> previous registered output
> tags: avl1
>
> - name: Define our static value for the desired image number
> set_fact: B={{retain}} -- this is coming from the
> inventory
> tags: num2
>
> - name: difference
> shell: C=`expr "{{image_avl.stdout}}" - {{retain}}`
> register: num_del
> tags: del1
> - debug: var="num_del"
>
> On Tue, Feb 14, 2017 at 8:58 PM, Dick Visser <[email protected]> wrote:
>>
>> On 14 February 2017 at 16:12, DHAVAL JAISWAL <[email protected]> wrote:
>> > solved it.
>>
>> Well done!
>>
>> Any chance of sharing *how* you solved it?
>>
>>
>> Thanks,
>>
>> --
>> Dick Visser
>> Sr. System & Network Engineer
>> GÉANT
>>
>> Want to join us? We're hiring: https://www.geant.org/jobs
>>
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>> For more options, visit https://groups.google.com/d/optout.
>
>
>
>
> --
> Thanks & Regards
> Dhaval Jaiswal
>
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>
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--
Nehal J Wani
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