community.general.snap fails on 7.3.0 when list of packages is empty

[amartin3225]

Summary

When attempting to install a list of snap packages, if the list of snap packages is empty, an error is thrown and the playbook execution fails.

Issue Type

Bug Report

Component Name

snap

Ansible Version

$ ansible --version
ansible [core 2.14.5]
  config file = /home/<snip>/playbooks/ansible.cfg
  configured module search path = ['/usr/share/ansible/plugins/modules', '/home/<snip>/playbooks/library']
  ansible python module location = /home/<snip>/.local/lib/python3.10/site-packages/ansible
  ansible collection location = /home/<snip>/.ansible/collections:/usr/share/ansible/collections
  executable location = /home/<snip>/.local/bin/ansible
  python version = 3.10.12 (main, Jun 11 2023, 05:26:28) [GCC 11.4.0] (/usr/bin/python3)
  jinja version = 3.1.2
  libyaml = True

Community.general Version

$ ansible-galaxy collection list community.general
# /home/<snip>/.ansible/collections/ansible_collections
Collection        Version
----------------- -------
community.general 7.3.0

# /home/<snip>/.local/lib/python3.10/site-packages/ansible_collections
Collection        Version
----------------- -------
community.general 6.5.0

Configuration

 $ ansible-config dump --only-changed
CONFIG_FILE() = /home/<snip>/playbooks/ansible.cfg
DEFAULT_FORCE_HANDLERS(/home/<snip>/playbooks/ansible.cfg) = True
DEFAULT_MODULE_PATH(/home/<snip>/playbooks/ansible.cfg) = ['/usr/share/ansible/plugins/modules', '/home/<snip>/playbooks/library']
DEFAULT_STDOUT_CALLBACK(/home/<snip>/playbooks/ansible.cfg) = yaml
DISPLAY_SKIPPED_HOSTS(/home/<snip>/playbooks/ansible.cfg) = False
INJECT_FACTS_AS_VARS(/home/<snip>/playbooks/ansible.cfg) = True
RETRY_FILES_ENABLED(/home/<snip>/playbooks/ansible.cfg) = False
TRANSFORM_INVALID_GROUP_CHARS(/home/<snip>/playbooks/ansible.cfg) = always

OS / Environment

Ubuntu 22.04

Steps to Reproduce

defaults/main.yml:

snap_packages: []

tasks/main.yml:

- name: install snap packages
  community.general.snap:
    name: "{{ snap_packages }}"

Expected Results

I expected the playbook to complete successfully (even though no packages will be installed since the list is empty).

Actual Results

The playbook fails as follows:

 Module failed with exception: list index out of range

A workaround is to add the following:

- name: install snap packages
  community.general.snap:
    name: "{{ snap_packages }}"
  when: snap_packages.0 is defined

However this isn't necessary for other similar commands like ansible.builtin.apt and worked on older versions of community.general, so this seems like a bug.

Code of Conduct

• I agree to follow the Ansible Code of Conduct

[ansibullbot]

Files identified in the description:

• plugins/modules/snap.py

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

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[ansibullbot]

cc @angristan @vcarceler
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[felixfontein]

CC @russoz