Syntax to check if var - json

Question

I have a playbook to get all disks letter configured on my server and I need a task to verify if extra var letter is on the list.
For example I need to check if "F" is on the json data below.
Could you please help me on the best best syntax?
Thanks
{
"disks_drives_letter": [
[
"C"
],
[
"D"
],
[
"E"
],
[]
]
}

Answer 1

You can use setup module to get your host information like disks. For more information about the setup module https://docs.ansible.com/ansible/latest/collections/ansible/builtin/setup_module.html
Example of playbook:
- hosts: localhost
tasks:
gather_facts: false
vars:
my_disk_drives: ['sda', 'sdb']
tasks:
- name: Collect host hardware information
setup:
gather_subset:
- hardware
- name: Output if disk exist
debug:
msg: "{{ item }} exists"
loop: "{{ my_disk_drives }}"
when: item in hostvars[inventory_hostname].ansible_devices.keys() | list
- name: Output if disks does not exist
debug:
msg: "{{ item }} does not exist"
loop: "{{ my_disk_drives }}"
when: not item in hostvars[inventory_hostname].ansible_devices.keys() | list
Output:
TASK [Output if disk exist]
ok: [localhost] => (item=sda) => {
"msg": "sda exists"
}
skipping: [localhost] => (item=sdb)
TASK [Output if disks does not exist]
skipping: [localhost] => (item=sda)
ok: [localhost] => (item=sdb) => {
"msg": "sdb does not exist"
}

Answer 2

Use filters intersect and difference, and declare the lists
my_disks_exist: "{{ ansible_devices.keys()|intersect(my_disks) }}"
my_disks_not_exist: "{{ my_disks|difference(my_disks_exist) }}"
Example of a complete playbook for testing
- hosts: localhost
vars:
my_disks: [sda, sdb, sdc]
my_disks_exist: "{{ ansible_devices.keys()|intersect(my_disks) }}"
my_disks_not_exist: "{{ my_disks|difference(my_disks_exist) }}"
tasks:
- setup:
gather_subset: devices
- debug:
var: ansible_devices.keys()
- debug:
var: my_disks_exist
- debug:
var: my_disks_not_exist

Answer 3

| flatten help me thanks #vladimir-botka
- name: Get all disks letter from the disks infos
set_fact:
disks_drives_letters: "{{ win_disk_facts | json_query(query) | flatten }}"
- name: Check if disk_letter is used on server fail:
msg: "The disk letter already exist on the VM" when: '"{{ drive_letter }}" in "{{ disks_drives_letters}}"'