cannot access attributes of registered variable returned by AWS CLI command run

[Co S]

Hi All,

I cannot figure out how to reference the zone id attribute from the registered variable of the below AWS CLI.
For some reason it doesn't work.

Playbook:
___________________________
- name: List hosted zone
  command: aws route53 list-hosted-zones --max-items 1 --query 'HostedZones[?Name==`"{{ zone_name }}"`]' --output json
  register: hosted_zone_list_res

- name: Get hosted zone details
  set_fact: hosted_zone="{{ hosted_zone_list_res.stdout | from_json }}"

- debug: var=hosted_zone

- name: Get hosted zone ID
  set_fact: zone_id="{{ hosted_zone[0].Id }}"
___________________________


Here is the output:
___________________________
TASK: [route53_zone | Get hosted zone details] ********************************
ok: [127.0.0.1] => {"ansible_facts": {"hosted_zone": "[{u'Config': {u'Comment': u'Test public zone', u'PrivateZone': False}, u'CallerReference': u'20151115-095525', u'ResourceRecordSetCount': 2, u'Id': u'/hostedzone/Z2VTI3W5U16LCK', u'Name': u'aws.company.com.'}]"}}

TASK: [route53_zone | debug var=hosted_zone] **********************************
ok: [127.0.0.1] => {
    "var": {
        "hosted_zone": [
            {
                "CallerReference": "20151115-095525",
                "Config": {
                    "Comment": "Test public zone",
                    "PrivateZone": false
                },
                "Id": "/hostedzone/Z2VTI3W5U16LCK",
                "Name": "aws.company.com.",
                "ResourceRecordSetCount": 2
            }
        ]
    }
}

TASK: [route53_zone | Get hosted zone ID] *************************************
fatal: [127.0.0.1] => One or more undefined variables: 'unicode object' has no attribute 'Id'

FATAL: all hosts have already failed -- aborting
___________________________

Could you please advise what I'm doing wrong?

Regards,
Costea

[Matt Martz]

You will have issues trying to use '|from_json' in a set_fact as it is likely to cast the value back to a string before Ansible 2.0.

You should typically always use filters that change the data type in the "last mile".

So instead of using set_fact, just use the registered var where you need it.  If you want, you could always use set_fact to give you easier direct access to stdout, but you will still need to use '|from_json' in the last mile.

Such as:

(hosted_zone_list_res.stdout | from_json)[0].Id

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Matt Martz
@sivel
sivel.net