ansible-core 2.12 - changes to "to_nice_yaml" output

[Claus Holbech]

We are seeing a small change to the output of "to_nice_yaml" and "to_yaml" when using ansible-core 2.12 versus 2.11.5 and older. The changes are only about escaping for wrapped multi-line strings.

If this in on purpose, please let me know how I can get the older ansible versions to produce the same output.

Thanks

Claus

Simple playbook:

- hosts: localhost

gather_facts: false

vars:

test_var: |

test line 1 which is very long so it wraps around during templating ..................

test line 2 which is indented

tasks:

- debug:

msg: '{{ lookup("template","test.j2") }}'

- debug:

msg: '{{ lookup("template","test.j2") | from_yaml }}'

- debug:

msg: '{{ lookup("template","test.j2") | from_yaml | to_nice_yaml(indent=2, sort_keys=False) }}'

And very simple template:

test: |

{{ test_var | indent(2,false) }}

Output from 2.11.5:

TASK [debug] **********************************************************************************************************************************************************************************

tirsdag 09 november 2021 10:54:14 +0100 (0:00:00.013) 0:00:00.013 ****** ok: [localhost] => { "msg": "test: |\n test line 1 which is very long so it wraps around during templating ..................\n test line 2 which is indented\n" } TASK [debug] ********************************************************************************************************************************************************************************** tirsdag 09 november 2021 10:54:14 +0100 (0:00:00.025) 0:00:00.039 ****** ok: [localhost] => { "msg": { "test": "test line 1 which is very long so it wraps around during templating ..................\n test line 2 which is indented\n" } } TASK [debug] ********************************************************************************************************************************************************************************** tirsdag 09 november 2021 10:54:14 +0100 (0:00:00.030) 0:00:00.069 ****** ok: [localhost] => { "msg": "test: \"test line 1 which is very long so it wraps around during templating ..................\\n\\\n \\ test line 2 which is indented\\n\"\n" }

Output from 2.12.0:

TASK [debug] **********************************************************************************************************************************************************************************

tirsdag 09 november 2021  11:03:48 +0100 (0:00:00.014)       0:00:00.014 ****** 

ok: [localhost] => {

    "msg": "test: |\n  test line 1 which is very long so it wraps around during templating ..................\n    test line 2 which is indented\n"

}

TASK [debug] **********************************************************************************************************************************************************************************

tirsdag 09 november 2021  11:03:48 +0100 (0:00:00.028)       0:00:00.042 ****** 

ok: [localhost] => {

    "msg": {

        "test": "test line 1 which is very long so it wraps around during templating ..................\n  test line 2 which is indented\n"

    }

}

TASK [debug] **********************************************************************************************************************************************************************************

tirsdag 09 november 2021  11:03:48 +0100 (0:00:00.029)       0:00:00.072 ****** 

ok: [localhost] => {

    "msg": "test: \"test line 1 which is very long so it wraps around during templating ..................\\n\n  \\ test line 2 which is indented\\n\"\n"

}

[Matt Martz]

The only changes to YAML in 2.12 were to properly prefer the C extension/libyaml over the pure python implementation.  So it's possible there is some emitter difference between the pyyaml (python) and libyaml (C) implementations.

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Matt Martz
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[Claus Holbech]

Thanks Matt

Is there a way I can force Ansible 2.11.x into using the C extension/libyaml variant?

[Claus Holbech]

Your points lead me to this article: https://docs.ansible.com/ansible/latest/user_guide/playbooks_filters.html#formatting-data-yaml-and-json

Which notes the difference with default width of 80 with pyyaml. I changed the width to 2147483647 on the "to_nice_yaml":

- debug:

msg: "{{ lookup('template','test.j2') | from_yaml | to_nice_yaml(indent=2, sort_keys=False, width=2147483647) }}"

and now I see the same output from 2.11 and 2.12.

Thank you for the quick support!