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ansible
Khaled Abouelneil
Khaled Abouelneil

Reputation: 23

Ansible - How to loop on a list and make split then assign the results to another list

I have ansible list variable

- sites:
    - x.domain.com.ex
    - y.domain.com.ex
    - z.domain.com.ex

I need to make two variables as follows: list with the first level x y z and anther one with just the rest of domain name "domain.com.ex"

Your help is highly appreciated, thank you.

Upvotes: 2

Views: 1019

Answers (1)

Vladimir Botka
Vladimir Botka

Reputation: 68394

For example, put the below declarations into the vars

hostnames: "{{ sites|map('split', '.')|
                     map('first')|list }}"
domains: "{{ sites|map('reverse')|
                   map('splitext')|
                   map('first')|
                   map('reverse')|list }}"

give (abridged)

hostnames:
  - x
  - y
  - z

domains:
  - domain.com.ex
  - domain.com.ex
  - domain.com.ex

Example of a complete playbook for testing

- hosts: localhost

  vars:

    sites:
      - x.domain.com.ex
      - y.domain.com.ex
      - z.domain.com.ex

    hostnames: "{{ sites|map('split', '.')|
                         map('first')|list }}"
    domains: "{{ sites|map('reverse')|
                       map('splitext')|
                       map('first')|
                       map('reverse')|list }}"

  tasks:

    - debug:
        var: hostnames
    - debug:
        var: domains

Q: "I need the second variable."

A: Use Python slices. For example, split and flatten all items

s: "{{ sites|map('split', '.')|flatten }}"

gives

  s:
  - x
  - domain
  - com
  - ex
  - y
  - domain
  - com
  - ex
  - z
  - domain
  - com
  - ex

Then, select second variable with the step of 4

sites_1: "{{ s[1::4] }}"

gives

sites_1:
  - domain
  - domain
  - domain

This way you can create any combination you want. For example,

sites_domns: "{{ s[1::4]|zip(s[2::4])|zip(s[3::4])|
                 map('flatten')|map('join', '.')|list }}"

gives

sites_domns:
  - domain.com.ex
  - domain.com.ex
  - domain.com.ex

See Understanding slicing.

Upvotes: 2

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