default(omit) fails to omit param and place_holder is used as variable data

[ddffgpmfn]

When running this ec2 module task without the 'build_number' variable, the EC2 machine is created with a build tag of '__omit_place_holder__6248a11ef81332080f31b81d2894e811f905b723' instead of being empty as expected.

Is the formatting wrong or is there a bug here?:

  - name: provision an instance

    ec2:

      ec2_access_key: "{{ ec2_access_key }}"

      aws_secret_key: "{{ ec2_secret_key }}"

      region: "{{ region }}"

      key_name: "{{ key }}"

      group: "{{ security_group_name }}"

      instance_type: "{{instance_type }}"

      monitoring: yes

      image: "{{ instance_store_ami_data.ami }}"

      vpc_subnet_id: "{{ subnet_euw1c }}"

      assign_public_ip: yes

      wait: true

      exact_count: 1

      count_tag:

        role: sid

        env: "{{ environment_name }}"

        build: "{{ build_number | default(omit) }}"

      instance_tags:

        role: sid

        env: "{{ environment_name }}"

        build: "{{ build_number | default(omit) }}"

        status: new

[ddffgpmfn]

 The output in the AWS console.

[Matt Martz]

That is due to "omit" only working for top level keys (arguments of the module) and not sub keys.

Maybe using "|default('')" would work instead.

On Friday, June 19, 2015, ddffgpmfn <t...@aioue.net> wrote:

 The output in the AWS console.

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Matt Martz
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sivel.net

[ddffgpmfn]

Alas, default('') applies an empty tag which then shows up in the inventory.

I don't see a ticket about this, may I raise an enhancement?

[Matt Martz]

I don't see why not, logging an issue could result in adding such functionality.

Another thing to try in the meantime is to replace with a '~'. Quotes are probably necessary.

~ in YAML means None in Python.

On Friday, June 19, 2015, ddffgpmfn <t...@aioue.net> wrote:

Alas, default('') applies an empty tag which then shows up in the inventory.

I don't see a ticket about this, may I raise an enhancement?

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[ddffgpmfn]

Thanks Matt,

Without quotes:

Failed to template {{ build_number | default(~) }}: template error while templating string: unexpected '~'

With singles quotes it is not converted to null and simple taken as a string. Will raise an issue.

On Friday, June 19, 2015 at 10:55:27 PM UTC+1, Matt Martz wrote:

I don't see why not, logging an issue could result in adding such functionality.

Another thing to try in the meantime is to replace with a '~'. Quotes are probably necessary.

~ in YAML means None in Python.

On Friday, June 19, 2015, ddffgpmfn <t...@aioue.net> wrote:

Alas, default('') applies an empty tag which then shows up in the inventory.

I don't see a ticket about this, may I raise an enhancement?

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