Generic way to list installed packages using Ansible

问题

Right now in my current setup I am using Ansible with CentOs hosts. One of the tasks contains the following line:

command: yum list installed somepackagename

As seen above the task will only work for hosts which support yum , but what if I want to run it on Ubuntu or some other Linux distribution?
After researching a bit online I found out that there is a generic package manager called package. With this I install/uninstall packages without worrying about the underlying hosts but not do something like list them as seen above. Is there any module or any way I could achieve this in a generic way without creating multiple whens?

回答1:

An option is to include OS specific variables. For example:

- name: vars
  include_vars:
    file: "{{ item }}"
  with_first_found:
    - files:
        - "{{ ansible_distribution }}-{{ ansible_distribution_release }}.yml"
        - "{{ ansible_distribution }}.yml"
        - "{{ ansible_os_family }}.yml"
        - "default.yml"
      paths: '{{ role_path }}/vars'

来源：https://stackoverflow.com/questions/53333097/generic-way-to-list-installed-packages-using-ansible