- name: Make sure the role is run on Fedora
  fail:
    msg: "This role supports Fedora only"
  when: "ansible_distribution != 'Fedora'"

- name: Check requested version
  fail:
    msg: |
      Unknown ghc version: {{ ghc_version }}.
      It needs to be defined in {{ opendev_url }}/roles/ensure-ghc/defaults/main.yaml
  when: ghc_versions[ghc_version] is not defined
  vars:
    opendev_url: https://opendev.org/zuul/zuul-jobs/src/branch/master/

- name: Check ghc version
  command: ghc --version
  failed_when: false
  register: _ghc_version

- name: Install ghc
  dnf:
    name: "@ghc:{{ ghc_versions[ghc_version]|string }}"
    state: present
  become: yes
  when: "_ghc_version.rc != 0 or (ghc_versions[ghc_version]|string) not in _ghc_version.stdout"