In case someone else hits this fascinating problem. This is what I had to 
do in the end ...

---
- name: FAILER!
  command: /bin/false
  register: result
  with_items:
    - one
    - two
  ignore_errors: True

- name: Error checker
  fail:
    msg: "FAILER! FAILED!"
  when: result.failed is defined and (ignore_replication_errors is not 
defined or (ignore_replication_errors is defined and not 
ignore_replication_errors|bool))



On Thursday, August 17, 2017 at 11:14:16 AM UTC-7, G Sudduth wrote:
>
> Hi,
>
> So, I have a task  ...
>
> ---
> - name: FAILER!
>   command: /bin/false
>   #with_items:
>   #  - one
>   #  - two
>   #ignore_errors: True
>   ignore_errors: "{{ ignore_replication_errors | default(false) }}"
>
> If I go ...
>
> ansible-playbook  test.pl --extra-vars "ignore_replication_errors=false"
> ansible-playbook  test.pl --extra-vars "ignore_replication_errors=true"
>
> ... it works correctly ...
>
> localhost    : ok=5    changed=1    unreachable=0    failed=1 
> ... and ...
> localhost    : ok=5    changed=1    unreachable=0    failed=0
>
> However, if I change it like this ...
> ---
> - name: FAILER!
>   command: /bin/false
>   with_items:
>     - one
>     - two
>   #ignore_errors: True
>   ignore_errors: "{{ ignore_replication_errors | default(false) }}"
>
> ... it always ignores ...
>
> localhost    : ok=5    changed=1    unreachable=0    failed=0
>
> Also, it works as expected if I take the variable out and explicitly set 
> True or False ...
> ---
> - name: FAILER!
>   command: /bin/false
>   with_items:
>     - one
>     - two
>   ignore_errors: True
>   #ignore_errors: "{{ ignore_replication_errors | default(false) }}"
>
> So, it kinda feels like the variable interpretation working differently 
> when I throw with_items into the mix. I was thinking that maybe using 
> quotes and squiggly braces was causing the value of the variable to be 
> interpreted as a string instead of a boolean, but after a lot of fiddling 
> with it (using |bool etc.) I couldn't find another syntax that worked.
>
> Is this a bug? Am I missing something?
>
> Thanks, 
> --
> Glenn
>
> PS 
>
> ansible-playbook --version
> ansible-playbook 2.3.1.0
>   config file = ...
>   configured module search path = Default w/o overrides
>   python version = 2.7.13 (default, Jun 26 2017, 10:20:05) [GCC 7.1.1 
> 20170622 (Red Hat 7.1.1-3)]
>
>
>
>
>
>
>
>

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