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.
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'
If X is 1, the playbook runs as expected:
#> ansible-playbook b.yml -e'X=1'
PLAY [127.0.0.1]
***************************************************************
TASK [get json]
****************************************************************
changed: [127.0.0.1]
TASK [echo a array]
************************************************************
ok: [127.0.0.1] => (item=1) => {
"item": 1,
"msg": 1
}
ok: [127.0.0.1] => (item=2) => {
"item": 2,
"msg": 2
}
ok: [127.0.0.1] => (item=3) => {
"item": 3,
"msg": 3
}
PLAY RECAP
*********************************************************************
127.0.0.1 : ok=2 changed=1 unreachable=0 failed=0
But if X is not 1, then the 'get json' task doesn't run, so b is not
defined, and the 'echo a array' task fails:
#> ansible-playbook b.yml -e'X=0'
PLAY [127.0.0.1]
***************************************************************
TASK [get json]
****************************************************************
skipping: [127.0.0.1]
TASK [echo a array]
************************************************************
fatal:
[127.0.0.1]: FAILED! => {"failed": true, "msg": "Unexpected
templating type error occurred on ({{ (b.stdout | from_json).a }}):
expected string or buffer"}
PLAY RECAP
*********************************************************************
127.0.0.1 : ok=0 changed=0 unreachable=0 failed=1
I've seen examples where folks use the default() filter on the with_items:
loop, but I can't figure out how to include a filter that'll work with the
from_json and the .a. Any ideas?
Rob
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