Allow Jinja variables in dynamic inventory regions configuration

[keenan-v1]

Summary

I am trying to make an inventory configuration using the aws_ec2 and aws_rds plugins. Using best practices with IaC, I pass my region in as a variable. I discovered that the following does not currently work:

The error is that {{ aws_region }} is not a valid region, which is correct. I expected it to replace the value with the desired region.

Issue Type

Feature Idea

Component Name

aws_rds, aws_ec2 inventory plugins

Additional Information

I would like this to work:

plugin: amazon.aws.aws_rds
statuses:
  - available
regions:
  - "{{ aws_region }}"

Code of Conduct

• I agree to follow the Ansible Code of Conduct

[ansibullbot]

Files identified in the description:

• [lib/ansible/plugins/inventory](https://github.com/['ansible-collections/amazon.aws', 'ansible-collections/community.aws', 'ansible-collections/community.vmware']/blob/main/lib/ansible/plugins/inventory)

If these files are inaccurate, please update the component name section of the description or use the !component bot command.

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[mdavis-xyz]

I'm having a similar problem with a different field (filters) that I expect to be templated but isn't.

@s-hertel I don't understand why some fields are templated and some aren't. I'm trying to spot the difference in the code.
Is it TEMPLATABLE_OPTIONS? Defined here:

amazon.aws/plugins/plugin_utils/inventory.py

Lines 31 to 37 in f399fb7

	TEMPLATABLE_OPTIONS = (
	"access_key",
	"secret_key",
	"session_token",
	"profile",
	"iam_role_name",
	)

and used here?

amazon.aws/plugins/plugin_utils/inventory.py

Lines 49 to 58 in f399fb7

	def get(self, *args):
	value = self.original_options.get(*args)
	if not value:
	return value
	if args[0] not in self.TEMPLATABLE_OPTIONS:
	return value
	if not self.templar.is_template(value):
	return value
	return self.templar.template(variable=value, disable_lookups=False)

[akira6592]

Any updates?

I too would like to use templates withfilters.

[akira6592]

@keenan-v1 Hello.

By #1980, the region and regions parameters are support template.

It will be included in a future release.

inventory_aws_ec2.yml:

---
plugin: aws_ec2
regions: 
  - "{{ lookup('env', 'AWS_REGION') }}"
hostnames:
  - tag:Name

% AWS_REGION=ap-northeast-1 ansible-inventory -i inventory_aws_ec2.yml --graph 
@all:
  |--@ungrouped:
  |--@aws_ec2:
  |  |--my_instance1

However, --extra-vars is still not supported.