How can I convert `key=value` file into Ansible facts?

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I've got a file containing a few lines of simple shell-style (key=value, no whitespace or special characters) assignments. How would I go about converting this to a set of top-level facts using ansible.builtin.set_fact? expandvars looks like it might be relevant, but I can't find any examples or even any decent documentation.

ansible
1 Answers

For example, given the configuration file

shell> cat conf.ini
key1=alpha=beta=charlie
key2=value2
key3= value3

The variable below

config_vars: "{{ dict(lookup('file', 'conf.ini').split('\n')|
                      map('split', '=', 1)|
                      map('map', 'trim')) }}"

expands to

config_vars:
  key1: alpha=beta=charlie
  key2: value2
  key3: value3

You can remove the last map/trim filter from the pipe if you're sure there are no spaces in the configuration file. But, to be on the safe side, I'd keep it.

Config file at the remote host

The solution in the previous section works at the controller only because the lookup plugins execute at the localhost. Fetch the files first if they are at the remote hosts. For example, given the configuration files

shell> ssh admin@test_11 cat /tmp/conf.ini
key1=alpha=beta=charlie
key2=value2
key3= value3

shell> ssh admin@test_12 cat /tmp/conf.ini
key1=value1
key2= value2
key3=alpha=beta=charlie

the playbook below

- hosts: test_11,test_12
  vars:
    conf_ini_path: "conf_ini/{{ inventory_hostname }}/tmp/conf.ini"
    config_vars: "{{ dict(lookup('file', conf_ini_path).split('\n')|
                          map('split', '=', 1)|
                          map('map', 'trim')) }}"

  tasks:
    - fetch:
        dest: conf_ini
        src: /tmp/conf.ini
    - debug:
        var: config_vars

gives (abridged)

TASK [debug] ***********************************************
ok: [test_11] => 
  config_vars:
    key1: alpha=beta=charlie
    key2: value2
    key3: value3
ok: [test_12] => 
  config_vars:
    key1: value1
    key2: value2
    key3: alpha=beta=charlie

Alow no value

For example, given the configuration file

shell> cat conf.ini
key1=alpha=beta=charlie
key2=value2
key3= value3
key4

The variable below

config_vars: "{{ dict(lookup('file', 'conf.ini').split('\n')|
                      map('split', '=', 1)|
                      map('map', 'trim')|
                      map('json_query', '[]|[[0], [1]]')) }}"

expands to

config_vars:
  key1: alpha=beta=charlie
  key2: value2
  key3: value3
  key4: null
user_64825610
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