Build fails (v0.22.1) with libselinux-python error with Python 3.8

[kmcgrego1307]

I'm trying to build Oracle Linux 8 but with Python 3.8 pre-installed to make later Ansible work easier.

I modified builds/linux/oracle/8/data/ks.pkrtpl.hcl to read:

### Post-installation commands.
%post
dnf install -y oracle-epel-release-el8
dnf makecache
dnf install -y sudo open-vm-tools perl
dnf install -y python38
dnf install -y libselinux-python3
%{ if additional_packages != "" ~}
dnf install -y ${additional_packages}
%{ endif ~}
echo "${build_username} ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers.d/${build_username}
sed -i "s/^.*requiretty/#Defaults requiretty/" /etc/sudoers
%end

And now I get this error:

==> vsphere-iso.linux-oracle: TASK [configure : Disabling SELinux.] ******************************************
==> vsphere-iso.linux-oracle: An exception occurred during task execution. To see the full traceback, use -vvv. The error was: ModuleNotFoundError: No module named 'selinux'
==> vsphere-iso.linux-oracle: fatal: [default]: FAILED! => {"changed": false, "msg": "Failed to import the required Python library (libselinux-python) on localhost's Python /usr/bin/python3.8. Please read the module documentation and install it in the appropriate location. If the required library is installed, but Ansible is using the wrong Python interpreter, please consult the documentation on <sensitive>_python_interpreter"}
==> vsphere-iso.linux-oracle:
==> vsphere-iso.linux-oracle: PLAY RECAP *********************************************************************
==> vsphere-iso.linux-oracle: default                    : ok=15   changed=10   unreachable=0    failed=1    skipped=17   rescued=0    ignored=0
==> vsphere-iso.linux-oracle:
==> vsphere-iso.linux-oracle: Error executing Ansible: Non-zero exit status: exit status 2
==> vsphere-iso.linux-oracle: Step "StepProvision" failed

I guess it's looking for libselinux-python instead of libselinux-python3 (or python3-libselinux, which I also tried). How do I override that so it finds the right library version?

[tenthirtyam]

You'd need to set it in the provisioner block.

provisioner "ansible" {
    #...
    ansible_env_vars = [
      "ANSIBLE_CONFIG=${path.cwd}/ansible/ansible.cfg",
      "ANSIBLE_PYTHON_INTERPRETER=/usr/libexec/platform-python"
    ]
    #...
  }

[tenthirtyam]

Ref: #1061