dig lookup exception: 'list' object has no attribute 'startswith'

[rjwagn...@gmail.com]

Hey all-

I'm having more problems w/ the dig lookup.  If I statically define a list of hosts to lookup as a variable, it works.  But if I return the list of hosts from another script, it fails.  Here's a simple example:

$ cat test.py
#!/usr/bin/env python

import json

hostList = []
hostList.append(('www.google.com'))
j = {}
j['hosts'] = hostList
print json.dumps(j)

$ cat test.yml
---
- hosts: all
  vars:
    ldap_names:
      - { cn: 'bogus', default: yes }

  tasks:
  - name: lookup ldap_names in directory
    shell: ". /etc/env_ansible ; /home/rowagn/data-platform/oracle/ansible/client12c/test.py -j {{ item.cn }}"
    with_items: "{{ ldap_names }}"
    register: oidLookup_output
    delegate_to: localhost
    become: no

  - name: debug
    debug: msg="result is {{ (item.stdout | from_json).hosts }}"
    with_items: "{{ oidLookup_output.results }}"

  - name: lookup
    debug: msg="IP is {{ lookup('dig', (item.stdout | from_json).hosts, wantlist=True) }}"
    with_items: "{{ oidLookup_output.results }}"

$ ansible-playbook  -clocal test.yml

PLAY [all] *********************************************************************

TASK [setup] *******************************************************************
ok: [10.239.211.85]

TASK [lookup ldap_names in directory] ******************************************
changed: [10.239.211.85 -> localhost] => (item={u'default': True, u'cn': u'bogus'})

TASK [debug] *******************************************************************
ok: [10.239.211.85] => (item={'_ansible_parsed': True, '_ansible_item_result': True, u'end': u'2018-12-10 12:34:26.177251', '_ansible_no_log': False, u'stdout': u'{"hosts": ["www.google.com"]}', u'cmd': u'. /etc/env_ansible ; /home/rowagn/data-platform/oracle/ansible/client12c/test.py -j bogus', u'changed': True, 'invocation': {'module_name': u'command', u'module_args': {u'creates': None, u'executable': None, u'_uses_shell': True, u'_raw_params': u'. /etc/env_ansible ; /home/rowagn/data-platform/oracle/ansible/client12c/test.py -j bogus', u'removes': None, u'warn': True, u'chdir': None}}, 'item': {u'default': True, u'cn': u'bogus'}, u'delta': u'0:00:00.013173', u'stderr': u'', u'rc': 0, '_ansible_delegated_vars': {'ansible_host': u'localhost'}, 'stdout_lines': [u'{"hosts": ["www.google.com"]}'], u'start': u'2018-12-10 12:34:26.164078', u'warnings': []}) => {
    "item": {
        "changed": true,
        "cmd": ". /etc/env_ansible ; /home/rowagn/data-platform/oracle/ansible/client12c/test.py -j bogus",
        "delta": "0:00:00.013173",
        "end": "2018-12-10 12:34:26.177251",
        "invocation": {
            "module_args": {
                "_raw_params": ". /etc/env_ansible ; /home/rowagn/data-platform/oracle/ansible/client12c/test.py -j bogus",
                "_uses_shell": true,
                "chdir": null,
                "creates": null,
                "executable": null,
                "removes": null,
                "warn": true
            },
            "module_name": "command"
        },
        "item": {
            "cn": "bogus",
            "default": true
        },
        "rc": 0,
        "start": "2018-12-10 12:34:26.164078",
        "stderr": "",
        "stdout": "{\"hosts\": [\"www.google.com\"]}",
        "stdout_lines": [
            "{\"hosts\": [\"www.google.com\"]}"
        ],
        "warnings": []
    },
    "msg": "result is [u'www.google.com']"
}

TASK [lookup] ******************************************************************
fatal: [10.239.211.85]: FAILED! => {"failed": true, "msg": "An unhandled exception occurred while running the lookup plugin 'dig'. Error was a <type 'exceptions.AttributeError'>, original message: 'list' object has no attribute 'startswith'"}

PLAY RECAP *********************************************************************
10.239.211.85              : ok=3    changed=1    unreachable=0    failed=1  

I'm sure I'm overlooking something simple, but I've been staring at this for two hours.  Can anyone spot my error?

Rob

[Kai Stian Olstad]

On Monday, 10 December 2018 18:39:02 CET rjwagn...@gmail.com wrote:
> - name: debug
> debug: msg="result is {{ (item.stdout | from_json).hosts }}"
> with_items: "{{ oidLookup_output.results }}"

Your hosts is a list with one element www.google.com

>
> - name: lookup
> debug: msg="IP is {{ lookup('dig', (item.stdout | from_json).hosts,
> wantlist=True) }}"
> with_items: "{{ oidLookup_output.results }}"

So here you are feeding dig a list, it doesn't take a list, only a string.

> TASK [debug]
> *******************************************************************
> ok: [10.239.211.85] => (item={'_ansible_parsed': True,
> '_ansible_item_result': True, u'end': u'2018-12-10 12:34:26.177251',

</snip>

> "stdout": "{\"hosts\": [\"www.google.com\"]}",
> "stdout_lines": [
> "{\"hosts\": [\"www.google.com\"]}"
> ],
> "warnings": []
> },
> "msg": "result is [u'www.google.com']"

Here you clearly see that it's a list and not a string.


--
Kai Stian Olstad

[Rob Wagner]

Thanks Kai. That's it.  I thought I had read somewhere that dig will accept a list, but clearly not.

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[Kai Stian Olstad]

On Monday, 10 December 2018 19:53:15 CET Rob Wagner wrote:
> Thanks Kai. That's it. I thought I had read somewhere that dig will accept
> a list, but clearly not.

Doesn't accept a list, but do return a list if wantlist=True.

--
Kai Stian Olstad