I used to be able to do this in order to construct EC2 instance user data
from a template, but only if the template file existed -- otherwise, leave
the user data empty.
- name: create {{ description }} instance
ec2:
[...]
user_data: '{{ lookup("template",
"../templates/user_data/" + instance + ".j2")
| default(None) }}'
I think I was actually taking advantage of the fact that the lookup plugin
used to silently eat template errors (is that right?), but no longer does
-- now I get
TASK: [aws-ec2 | create Data Importer instance]
*********************************
fatal: [aws-vpc-hbi16058] => unable to read
/Users/bam/dev/h3-ansible/roles/aws-ec2/templates/user_data/data-importer.j2
Is there another way I can accomplish this sort of
lookup-template-but-only-if-it-exists?
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