On 08.08.2018 22:10, rjwagner....@gmail.com wrote:
I'm running into the infamous issue where with_items isn't skipped if
when
evaluates to false (https://github.com/ansible/ansible/issues/13791).
That
said, I'm at loss as to how to workaround my particular issue.
It's not that infamous, it's just how Jinja work, and when you
understand the concept it is easy to deal with.
Consider these two tasks (simplified for discussion):
#> cat b.yml
---
- hosts: 127.0.0.1
connection: local
gather_facts: False
tasks:
- name: get json
shell: "echo '{ \"a\": [ 1,2,3 ] }'"
register: b
when: X=='1'
- name: echo a array
debug: msg="{{ item }}"
with_items: "{{ (b.stdout | from_json).a }}"
when: X=='1'
When X=0 the variable b will be defined, it contains data about the
sipped reason.
But b will not contain the key stdout so this variable need to be
filtered through default filter.
Since b.stdout is filter through from_json the default filter need to
provide a empty json string to satisfy the filter.
with_items: "{{ (b.stdout | from_json).a }}"
becomes
with_items: "{{ (b.stdout | default('{}') | from_json).a }}"
but this will also fail since the empty {} json string doesn't contain a
key name "a" so this also need to go through the default filter.
Since with_items need a list this must be an empty list [], so it
becomes
with_items: "{{ (b.stdout | default('{}') | from_json).a | default([])
}}"
So the principle is, if a variable is not defined it need to go through
the default filter.
I hope this explanation gave some meaning.
--
Kai Stian Olstad
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