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When I try to loop (with Ansible 2.6 loop) with subelements through all public keys of a list of users and encounter a user which has no public keys defined:

- authorized_key: user: "{{ item.0.username }}" state: present key: "{{ item.1.pub_key }}" loop: "{{ users | subelements('ssh_pub_keys') | default ([]) }}" loop_control: label: "{{ item.username }}"

I'm getting the following error: the key 'ssh_pub_keys' should point to a list, got None

When I try to use skip_missing like this:

- authorized_key: user: "{{ item.0.username }}" state: present key: "{{ item.1.pub_key }}" loop: "{{ lookup('subelements', users, 'ssh_pub_keys', {'skip_missing': True})}}" loop_control: label: "{{ item.username }}"

I get this error: 'list object' has no attribute 'username'

This could be the users list:

users: - username: usera ssh_pub_keys: - from: home pub_key: kdzadizajdiazjd - from: work pub_key: dzadadazdzadzad - username: userb ssh_pub_keys: - from: home pub_key: kdzadizajdiazjd - from: work pub_key: dzadadazdzadzad - username: userc - username: userd ssh_pub_keys: - from: home pub_key: kdzadizajdiazjd - from: work pub_key: dzadadazdzadzad

How can I make the loop with subelements to go to the next user without throwing an error when a user is encountered which has no ssh_pub_keys list?

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1 Answer 1

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Q: "Error: the key 'ssh_pub_keys' should point to a list, got None."

A: You might want to use lookup and set 'skip_missing': True.

 loop: "{{ lookup('subelements', users, 'ssh_pub_keys', {'skip_missing': True}) }}"

Optionally, you can use subelements as a filter. The below loop gives the same results

 loop: "{{ users | subelements('ssh_pub_keys', skip_missing=true) }}"

Q: "Error: 'list object' has no attribute 'username'"

A: The index is missing. Please fix it.

 label: "{{ item.0.username }}"

Example of a complete playbook for testing

- hosts: localhost vars: users: - username: foo ssh_pub_keys: - pub_key: k1 - pub_key: k2 - username: bar - username: baz ssh_pub_keys: - pub_key: k1 - pub_key: k2 tasks: - debug: msg: "{{ item.0.username }} {{ item.1.pub_key }}" loop: "{{ users | subelements('ssh_pub_keys', skip_missing=true) }}" loop_control: label: "{{ item.0.username }}"

gives (abridged)

 msg: foo k1 msg: foo k2 msg: baz k1 msg: baz k2

Note: The option key allows multiple keys. You don't have to iterate ssh_pub_keys. For example,

 - debug: msg: | user: "{{ item.username }}" key: | {{ item.ssh_pub_keys | map(attribute='pub_key') | join('\n') }} loop: "{{ users | selectattr('ssh_pub_keys', 'defined') }}"

gives (abridged)

 user: "foo" key: | k1\nk2 user: "baz" key: | k1\nk2
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  • Thanks, but when I try 'loop: "{{lookup('subelements', users, 'ssh_pub_keys', {'skip_missing': True})}}"' I get the error: 'list object' has no attribute 'username' Commented Jan 14, 2019 at 20:20
  • It seems like when I remove the loop control, your solution works. Feel free to add that to your answer. Commented Jan 15, 2019 at 15:50
  • I've added the answer. Commented Jun 28, 2021 at 9:57

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