resolve dictionary key or parameter variable in Ansible - ansible

Question

In Ansible, if I try to use a variable as a parameter name, or a key name, it is never resolved. For example, if I have {{ some_var }}: true, or:
template: "{{ resolve_me_to_src }}": "some_src"
the variables will just be used literally and never resolve. My specific use case is using this with the ec2 module, where some of my tag names are stored as variables:
- name: Provision a set of instances
ec2:
group: "{{ aws_security_group }}"
instance_type: "{{ aws_instance_type }}"
image: "{{ aws_ami_id }}"
region: "{{ aws_region }}"
vpc_subnet_id: "{{ aws_vpc_subnet_id }}"
key_name: "{{ aws_key_name }}"
wait: true
count: "{{ num_machines }}"
instance_tags: { "{{ some_tag }}": "{{ some_value }}", "{{ other_tag }}": "{{ other_value }}" }
Is there any way around this? Can I mark that I want to force evaluation somehow?

Answer 1

Will this work for you?
(rc=0)$ cat training.yml
- hosts: localhost
tags: so5
gather_facts: False
vars: [
k1: 'key1',
k2: 'key2',
d1: "{
'{{k1}}': 'value1',
'{{k2}}': 'value2',
}",
]
tasks:
- debug: msg="{{item}}"
with_dict: "{{d1}}"
(rc=0)$ ansible-playbook training.yml -t so5
PLAY [localhost] ****************************************************************
PLAY [localhost] ****************************************************************
TASK: [debug msg="{{item}}"] **************************************************
ok: [localhost] => (item={'key': 'key2', 'value': 'value2'}) => {
"item": {
"key": "key2",
"value": "value2"
},
"msg": "{'value': 'value2', 'key': 'key2'}"
}
ok: [localhost] => (item={'key': 'key1', 'value': 'value1'}) => {
"item": {
"key": "key1",
"value": "value1"
},
"msg": "{'value': 'value1', 'key': 'key1'}"
}
PLAY RECAP ********************************************************************
localhost : ok=1 changed=0 unreachable=0 failed=0
(rc=0)$
Trick is to wrap dict declaration with double quotes. Ansible applies this undocumented (but consistant) and crappy translation (ansible's equivalent of shell variable expantion) to most (not all) YAML values (everything RHS of ':') in the playbook. It is some combination putting these strings through Jinja2-engine, Python-interpreter and ansible-engine in some unknown order.

Answer 2

Another option - you can try something like:
module_name: "{{ item.key }}={{ item.value }}"
with_items:
- { key: "option", value: "{{ any_value }}" }
Please note that everything is inline and I'm using an equal (=) and everything is wrapped with double quotes.