Parse and filter json output in Ansible via json_query

Question

I have the below output that I'm trying to parse and filter:

  - name: lvs
    debug:
      msg: "{{ ansible_lvm.lvs }}"

ok: [localhost] => {
    "msg": {
        "av_root_snapshot": {
            "size_g": "4.00",
            "vg": "vg_root"
        },
        "av_var_snapshot": {
            "size_g": "5.00",
            "vg": "vg_root"
        },
        "lv_root": {
            "size_g": "20.00",
            "vg": "vg_root"
        },
        "lv_var": {
            "size_g": "15.00",
            "vg": "vg_root"
        }
    }
}

I'm trying to create a list of out it so it returns the following:

av_root_snapshot vg_root
av_var_snapshot vg_root

I am able to get the values of 'vg' via:

  - name: get snap
    debug:
      msg: "{{ ansible_lvm.lvs | json_query('*.vg') }}"

But what I can't seem to figure out is how to filter the root object names that end in *snapshot and parse the value of "vg". I'm trying to do this so I can also delete those snapshots.

How do I properly filter the above output and parse for the information I need?

I'm a little confused about what you're trying to do. For example, how are you getting from av_root_snapshot to av_root_snap1? — larsks
– larsks, Commented May 3, 2023 at 2:41

Vladimir Botka · Accepted Answer · 2023-05-03 05:59:09Z

2

Q: "Delete object names that end 'snapshot' and parse the value of vg."

A: Reject the keys matching the regex

  lvs_no_snapshot: "{{ ansible_lvm.lvs|dict2items|
                       rejectattr('key', 'regex', '^.*_snapshot$')|
                       items2dict }}"

gives

  lvs_no_snapshot:
    lv_root:
      size_g: '20.00'
      vg: vg_root
    lv_var:
      size_g: '15.00'
      vg: vg_root

Then, you can get the list of the attributes vg

  vg: "{{ lvs_no_snapshot|json_query('*.vg') }}"

edited May 3, 2023 at 5:59

answered May 3, 2023 at 5:52

Vladimir Botka

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