debug statement not working

[Jerry Seven]

I cant figure out why

---

- hosts: misc

  become: false

  gather_facts: yes

  tasks:

    - name: get package version

      shell: rpm -q {{ item }}

      with_items:

        - "package1"

        - "package2"

        - "package3"

      register: pkg

    - debug:

        msg: "{{ pkg.stdout }}"

FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'stdout'\n\nThe error appears to have been in '/opt/ansible/foo.yml': line 14, column 7, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n    - debug:\n      ^ here\n\nexception type: <class 'ansible.errors.AnsibleUndefinedVariable'>\nexception: 'dict object' has no attribute 'stdout'"}

[Jonathan Lozada De La Matta]

use quotes inside the shell "rpm -q {{ item }}" also you can list for for rpms using the yum module.

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Jonathan lozada de la matta

AUTOMATION PRACTICE

 

[Matt Martz]

When you do a loop on a task the registered variable structure changes. Try just debugging `pkg` to see the structure.  You will effectively have `pkg.results`

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[Felix Fontein]

Hi,

note that you're using a loop for the "get package version" task. The
structure of pkg is different because of that; in particular, pkg has
no attribute stdout (as the error message tells you). You could output
the whole content of pkg with debug to see that.

Cheers,
Felix

[Jerry Seven]

So I update debug to:

      register: pkg

    - debug:

        msg: "{{ pkg.results }}"

and stdout is printed:

ok: [hostname] => {

    "msg": [

        {

            "_ansible_ignore_errors": null, 

            "_ansible_item_result": true, 

            "_ansible_no_log": false, 

            "_ansible_parsed": true, 

            "changed": true, 

            "cmd": "rpm -q TaniumClient", 

            "delta": "0:00:00.024756", 

            "end": "2019-03-25 13:10:34.751439", 

            "failed": false, 

            "invocation": {

                "module_args": {

                    "_raw_params": "rpm -q TaniumClient", 

                    "_uses_shell": true, 

                    "chdir": null, 

                    "creates": null, 

                    "executable": null, 

                    "removes": null, 

                    "stdin": null, 

                    "warn": true

                }

            }, 

            "item": "TaniumClient", 

            "rc": 0, 

            "start": "2019-03-25 13:10:34.726683", 

            "stderr": "", 

            "stderr_lines": [], 

            "stdout": "TaniumClient-6.0.314.1442-1.rhe7.x86_64", 

            "stdout_lines": [

                "TaniumClient-6.0.314.1442-1.rhe7.x86_64"

            ]

        }, 

     

but

    - debug:

        msg: "{{ pkg.results.stdout }}"

fails.  Seems like I should be able to print that.

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[Jerry Seven]

I found this link which works:

https://ansiblemaster.wordpress.com/2017/02/24/debug-properly-data-registered-with-a-loop/ 

I just dont understand why it works:

- debug:
  msg: "{{ echo.results|map(attribute='stdout_lines')|list }}"

 

[Sebastian Meyer]

Hi Jerry,

On 25.03.19 18:12, Jerry Seven wrote:
> ok: [hostname] => {
> "msg": [

^ the [ tells you this is an array. This happens because you call
register on a task with a loop. For each item of the loop, a new dict
gets added to this array.

> {

You could print {{ pkg.results.0.stdout }} for the first element of the
loop, or {{ pkg.results.1.stdout }} for the second element of the loop.

> I just dont understand why it works:
>
> - debug:
> msg: "{{ echo.results|map(attribute='stdout_lines')|list
> }}"

What this does is, take the array of dictionaries, and look in each
dictionary for the key stdout_lines. Then take the value of that key and
make a list out of it.

HTH
Sebastian

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