CODEWITHSUNDEEP
linuxansibleyum
Garbageof
Garbageof

Reputation: 23

ansible yum check update parse output to have list of packages

I want to parse the output of yum check-update ansible equivalent to get only the list of package in human readable format.

My code so far:

- name: check for updates
  hosts: localhost
  gather_facts: true

  tasks:

 - name: check for updates (yum)
   yum: list=updates update_cache=true
   register: yumoutput
   when: ansible_distribution == 'CentOS' or ansible_distribution == 'Red Hat Enterprise Linux'
 - debug: msg={{ yumoutput.stdout | from_json }}

but I get:

fatal: [localhost]: FAILED! => {"msg": "Unexpected templating type error occurred on ({{ yumoutput.stdout | from_json }}): expected string or buffer"}

EDIT: the complete playbook:

---
- name: check for updates
  hosts: localhost
  gather_facts: true

  tasks:
  - name: check for updates (yum)
    yum: list=updates update_cache=true
    register: yumoutput
    when: ansible_distribution == 'CentOS' or ansible_distribution == 'Red Hat Enterprise Linux'
  - debug: var=yumoutput
    msg: "{{ yumoutput.results | map(attribute='name') | list }}

Upvotes: 0

Views: 20827

Answers (3)

Green
Green

Reputation: 21

Some minor syntax errors in the complete playbook. This did it for me

 ---
    - name: check for updates
      hosts: localhost
      gather_facts: true
    
      tasks:
          - name: check for updates (yum)
            yum: list=updates update_cache=true
            register: yumoutput
            when: ansible_distribution == 'CentOS' or ansible_distribution == 'Red Hat Enterprise Linux'
          - debug:
              msg: "{{ yumoutput.results | map(attribute='name') | list }}"

Upvotes: 2

Krishna Sharma
Krishna Sharma

Reputation: 131

In addition to the above-mentioned solution. You can use call back plugin for ease of reading the output.

Below is one of the human-readable call-back plugin:

https://github.com/n0ts/ansible-human_log

More info about call back plugins:

http://docs.ansible.com/ansible/devel/plugins/callback.html

Upvotes: -2

techraf
techraf

Reputation: 68589

yum module does not register stdout key ― you can see it using debug: var=yumoutput.

You need to extract the package names from the list of dictionaries, for example:

debug:
  msg: "{{ yumoutput.results | map(attribute='name') | list }}"

Upvotes: 6

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