Ansible loop through json output and add indexing-CodePudding

I've been trying to figure out for hours how to do the following with Ansible, and looping through a JSON output.

Let me explain, here is my playbook:

- hosts: myhosts
  connection: local
  gather_facts: yes
  tasks:
    - name: set_fact 
      set_fact: 
        disk_info: "{{ disks | json_query('[*].{disk_size: disksize}')}}"

    - name: print set_fact
      debug:
        msg: "{{ disk_info }}"

    - name: iterate on disk_info one and increase index 1..n
      debug:
        msg: "{{ item }} {{ my_idx }}"
      loop:
        - "{{ disk_info }}"
      loop_control:
        index_var: my_idx

Here is the json output that task - name: print outputs:

TASK [print] ****************************************************
ok: [hostname1] => {
    "msg": [
        {
            "disk_size": "200"
        },
        {
            "disk_size": "200"
        },
        {
            "disk_size": "200"
        }
    ]
}
ok: [hostname2] => {
    "msg": [
        {
            "disk_size": “300"
        }
    ]
}
ok: [hostname3] => {
    "msg": [
        {
            "disk_size": "250”
        }
    ]
}
ok: [hostname4] => {
    "msg": [
        {
            "disk_size": “500"
        },
        {
            "disk_size": “600”
        }
    ]
}

Here the output I'm getting from my task (- name: iterate on disk_info one and increase index 1..n)

ok: [hostname1] => (item=[{'disk_size': '200'}, {'disk_size': '200'}, {'disk_size': '200'}]) => {
    "msg": "[{'disk_size': '200'}, {'disk_size': '200'}, {'disk_size': '200'}] 0"
}
ok: [hostname2] => (item=[{'disk_size': ‘300'}]) => {
    "msg": "[{'disk_size': ‘300'}] 0"
}
ok: [hostname4] => (item=[{'disk_size': ‘500'}, {'disk_size': '600’}]) => {
    "msg": "[{'disk_size': ’500'}, {'disk_size': '600’}] 0"
}

Expected output:

Hostname1:
disk_size1: 200
disk_size2: 200
disk_size3: 200

Hostname2:
disk_size1: 300

Hostname3:
disk_size1: 500
disk_size2: 600

The expected output can be something similar but adding the index.

CodePudding user response：

Are you trying to add the index to the structure, or to textual output? To get your expected output, your last task should loop over the list (instead of a list that contains the list) and output the data in that form:

    - name: iterate on disk_info one and increase index 1..n
      debug:
        msg: "disk_size{{ my_idx }}: {{ item.disk_size }}"
      loop: "{{ disk_info }}"
      loop_control:
        index_var: my_idx

Creating a structure is more difficult, but not impossible. I'm going to demonstrate without using json_query or set_fact, which should be avoided unless you're doing something that's impossible without them.

- hosts: my_hosts
  vars:
    # You didn't provide an example of your input structure, so I'm assuming it
    # looks something like this.
    disks:
      - name: foo
        disksize: 200
      - name: bar
        disksize: 200
    disk_info: "{{ dict(range(0, disks | length) | map('regex_replace', '^', 'disk_size') | zip(disks | map(attribute='disksize'))) }}"
  tasks:
    - debug:
        msg: "{{ disk_info }}"

Result:

TASK [debug] *******************************************************************
ok: [harmless-ghoul.syslog.x.mail.umich.edu] => {
    "msg": {
        "disk_size0": 200,
        "disk_size1": 200
    }
}