Apologies - just noticed that my test playbook had an error in it (was
trying to simplify and clarify the test case and forgot to change the
template file name in a couple places). It doesn't change the behavior I'm
seeing, but this is the corrected version:
---
- name: Test with trivial template
hosts: localhost
tasks:
- copy:
dest: "trivial.json.j2"
content: '{ "hello": "world" }'
- set_fact:
template_result: "{{ lookup('template', 'trivial.json.j2') }}"
- set_fact:
json_from_fact_trivial_template: "{{ template_result | to_json }}"
json_from_template_trivial_template: "{{ lookup('template',
'trivial.json.j2') | to_json }}"
- debug:
var: json_from_fact_trivial_template
- debug:
var: json_from_template_trivial_template
- name: Test with template including variable
hosts: localhost
tasks:
- copy:
dest: "withvar.json.j2"
content: '{% raw %}{ "{{ greeting }}": "world" }{% endraw %}'
- set_fact:
greeting: 'howdy'
- set_fact:
template_result: "{{ lookup('template', 'withvar.json.j2') }}"
- set_fact:
json_from_fact_template_withvar: "{{ template_result | to_json }}"
json_from_template_withvar: "{{ lookup('template', 'withvar.json.j2')
| to_json }}"
- debug:
var: json_from_fact_template_withvar
- debug:
var: json_from_template_withvar
On Friday, January 21, 2022 at 2:57:31 PM UTC-6 John Riendeau wrote:
> Hi all,
>
> It seems like the to_json filter behaves differently depending on:
> - Whether it's passed the result of a template call directly, or whether
> the result of the template call is placed into a fact first
> - Whether the template call actually does any substitutions or not
> - Whether I'm using ansible community <=v4.10.0 or >=5.0.1
>
> I'm including a test playbook that illustrates the behavior below, along
> with the relevant portions of the output. I'm relatively new to Ansible, so
> wanted to check in here before submitting a bug report -- this may be just
> a nuance I'm not grasping.
>
> When I run the playbook using Ansible 4.10.0, to_json turns the value into
> a JSON string, if and only if it's passed the result of a template call
> which does no substitutions. If the template has a variable in it, or if
> the result of the template call is stored in a fact before being sent to
> to_json, the JSON looks how I'd expect.
>
> When using Ansible 5.0.1, the value is turned into a string whenever
> to_json is passed the result of a template call, regardless of whether the
> template has a variable in it or not.
>
> There's a lot of permutations here, and I'm not sure which, if any, of
> these behaviors are unexpected. Thanks in advance for any help!
>
> - John
>
> *Test playbook:*
> ---
> - name: Test with trivial template
> hosts: localhost
> tasks:
> - copy:
> dest: "trivial.json.j2"
> content: '{ "hello": "world" }'
> - set_fact:
> template_result: "{{ lookup('template', 'test.json.j2') }}"
> - set_fact:
> json_from_fact_trivial_template: "{{ template_result | to_json }}"
> json_from_template_trivial_template: "{{ lookup('template',
> 'test.json.j2') | to_json }}"
> - debug:
> var: json_from_fact_trivial_template
> - debug:
> var: json_from_template_trivial_template
>
> - name: Test with template including variable
> hosts: localhost
> tasks:
> - copy:
> dest: "withvar.json.j2"
> content: '{% raw %}{ "{{ greeting }}": "world" }{% endraw %}'
> - set_fact:
> greeting: 'howdy'
> - set_fact:
> template_result: "{{ lookup('template', 'withvar.json.j2') }}"
> - set_fact:
> json_from_fact_template_withvar: "{{ template_result | to_json }}"
> json_from_template_withvar: "{{ lookup('template', 'withvar.json.j2') |
> to_json }}"
> - debug:
> var: json_from_fact_template_withvar
> - debug:
> var: json_from_template_withvar
>
> *Output with Ansible 4.10.0:*
>
> TASK [debug]
> ****************************************************************************************************************************************************************
> ok: [localhost] => {
> "json_from_fact_trivial_template": {
> "hello": "world"
> }
> }
>
> TASK [debug]
> ****************************************************************************************************************************************************************
> ok: [localhost] => {
> "json_from_template_trivial_template": "\"{ \\\"hello\\\":
> \\\"world\\\" }\""
> }
>
> TASK [debug]
> ****************************************************************************************************************************************************************
> ok: [localhost] => {
> "json_from_fact_template_withvar": {
> "howdy": "world"
> }
> }
>
> TASK [debug]
> ****************************************************************************************************************************************************************
> ok: [localhost] => {
> "json_from_template_withvar": {
> "howdy": "world"
> }
> }
>
> *Output with Ansible 5.0.1:*
>
> TASK [debug]
> ****************************************************************************************************************************************************************
> ok: [localhost] => {
> "json_from_fact_trivial_template": {
> "hello": "world"
> }
> }
>
> TASK [debug]
> ****************************************************************************************************************************************************************
> ok: [localhost] => {
> "json_from_template_trivial_template": "\"{ \\\"hello\\\":
> \\\"world\\\" }\""
> }
>
> TASK [debug]
> ****************************************************************************************************************************************************************
> ok: [localhost] => {
> "json_from_fact_template_withvar": {
> "howdy": "world"
> }
> }
>
> TASK [debug]
> ****************************************************************************************************************************************************************
> ok: [localhost] => {
> "json_from_template_withvar": "\"{\\\"howdy\\\": \\\"world\\\"}\""
> }
>
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