Ansible task to strip out data from a file - shell

Question

A file has the following contents
com.dkr.container.id=a43019cc-d4a4-4acb-83dd-defd76443c6a
com.dkr.container.account=12HJB
I need to fetch a43019cc-d4a4-4acb-83dd-defd76443c6a and write it to a variable using an Ansible task. This value need to be passed to other tasks in the same Ansible file.
Can someone show me the required task to achieve this.

Answer 1

If your file is on the controller, you can use the file lookup to get its content.
If the file is on the node, you will have to use something like the slurp module.
Then, when you have the file content, you can use the regex_search filter to extract your required text.
With the file on the controller:
- set_fact:
com_dkr_container_id: >-
{{
lookup('file', '/path/to/file')
| regex_search('com\.dkr\.container\.id=(.*)', '\1')
| first
}}
With the file on the node(s):
- slurp:
src: /path/to/file
register: file_content
- set_fact:
com_dkr_container_id: >-
{{
file_content.content
| b64decode
| regex_search('com\.dkr\.container\.id=(.*)', '\1')
| first
}}

Answer 2

This is the job for the ini lookup plugin. See
shell> ansible-doc -t lookup ini
For example, given the file
shell> cat container.properties
com.dkr.container.id=a43019cc-d4a4-4acb-83dd-defd76443c6a
com.dkr.container.account=12HJB
The playbook
- hosts: localhost
tasks:
- set_fact:
id: "{{ lookup('ini', 'com.dkr.container.id
type=properties
file=container.properties') }}"
- debug:
var: id
gives
id: a43019cc-d4a4-4acb-83dd-defd76443c6a
The lookup plugins work on the controller only. If the file is at the remote host fetch it, e.g. given the file
shell> ssh admin#test_11 cat container.properties
com.dkr.container.id=a43019cc-d4a4-4acb-83dd-defd76443c6a
com.dkr.container.account=12HJB
The playbook
- hosts: test_11
tasks:
- fetch:
src: container.properties
dest: /tmp/fetched
- set_fact:
id: "{{ lookup('ini', 'com.dkr.container.id
type=properties
file=/tmp/fetched/{{ inventory_hostname }}/container.properties') }}"
- debug:
var: id
gives the same result
id: a43019cc-d4a4-4acb-83dd-defd76443c6a
The playbook above is idempotent. The file will be stored at the controller
shell> tree /tmp/fetched/
/tmp/fetched/
└── test_11
└── container.properties