community.general/test/integration/roles/test_lookups/tasks/main.yml

# test code for lookup plugins
# (c) 2014, James Tanner <tanner.jc@gmail.com>

# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.

# FILE LOOKUP

- name: make a new file to read
  copy: dest={{output_dir}}/foo.txt mode=0644 content="bar"

- name: load the file as a fact
  set_fact: 
    foo: "{{ lookup('file', output_dir + '/foo.txt' ) }}"

- debug: var=foo

- name: verify file lookup 
  assert: 
    that:
        - "foo == 'bar'"


# PASSWORD LOOKUP

- name: remove previous password files
  file: dest={{output_dir}}/password state=absent

- name: create a password file
  set_fact: 
    newpass: "{{ lookup('password', output_dir + '/password length=8') }}"

- name: get password length
  shell: wc -c {{output_dir}}/password | awk '{print $1}'
  register: wc_result

- debug: var=wc_result.stdout

- name: read password
  shell: cat {{output_dir}}/password
  register: cat_result

- debug: var=cat_result.stdout

- name: verify password
  assert:
    that:
        - "wc_result.stdout == '9'"
        - "cat_result.stdout == newpass"

# ENV LOOKUP        

- name: get first environment var name
  shell: env | head -n1 | cut -d\= -f1
  register: known_var_name

- name: get first environment var value
  shell: echo {{ '$' + known_var_name.stdout }}
  register: known_var_value 

- name: use env lookup to get known var
  set_fact: 
    test_val: "{{ lookup('env', known_var_name.stdout) }}"

- debug: var=known_var_name.stdout
- debug: var=known_var_value.stdout
- debug: var=test_val  

- name: compare values
  assert:
    that: 
        - "test_val == known_var_value.stdout"


# PIPE LOOKUP

# https://github.com/ansible/ansible/issues/6550
- name: confirm pipe lookup works with a single positional arg
  debug: msg="{{ lookup('pipe', 'ls') }}"         

# https://github.com/ansible/ansible/issues/6550
- name: confirm pipe lookup works with multiple positional args
  debug: msg="{{ lookup('pipe', 'ls /tmp /') }}"