在Jinja2模板中转义golang模板

Question

I have the following tasks:

- name: Set default log options for Splunk
  set_fact:
    log_options_base:
       tag: "{{ '{{' }}.ImageName{{ '}}' }}/{{ '{{' }}.Name{{ '}}' }}/{{ '{{' }}.ID{{ '}}' }}"
       splunk-token: "{{ splunk_token }}"
       splunk-url: "{{ splunk_url }}"
       splunk-format: "json"
       splunk-index: "my-dx"
       labels: "{{ env }}"
  when:
    - log_driver is defined
    - log_driver == 'splunk'
- name: Set extendend log options for Splunk
  set_fact:
    log_options_ext: "{{ log_options_base | combine({ 'env': NODE_ENV }) }}"
  when:
     - log_options_base != ""

Unfortunately I'm having the following issue:

template error while templating string: unexpected '.'. String: {{.ImageName}}/{{.Name}}/{{.ID}}

"The conditional check 'log_options_base != \"\"' failed.

The issue is definitely with the golang template but it is already escaped in my case.

Any idea?

Answer 1

when statement is a Jinja2 expression itself, so Ansible tries to evaluate your string once again.

You should be good with !unsafe typing in this case:

- name: Set default log options for Splunk
  set_fact:
    log_options_base:
       tag: !unsafe "{{.ImageName}}/{{.Name}}/{{.ID}}"

But I haven't used this syntax trick much, so there may be some side effects, test it before production use.

P.S. why do you compare dict var log_options_base with empty string in log_options_base != ""? May be you want is defined test?