python2_dnf is not available for Fedora 30 (rawhide)

[robertdebock]

SUMMARY

Fedora 30 (now rawhide, the unreleased development branch) will not offer python2-dnf anymore.

This causes a problem when installing python2 on Fedora 30.

ISSUE TYPE

• Bug Report

COMPONENT NAME

dnf

ANSIBLE VERSION

ansible 2.7.1
  config file = None
  configured module search path = [u'/home/robertdb/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/site-packages/ansible
  executable location = /usr/bin/ansible
  python version = 2.7.15 (default, Oct 15 2018, 15:26:09) [GCC 8.2.1 20180801 (Red Hat 8.2.1-2)]

CONFIGURATION

[no output]

OS / ENVIRONMENT

Control node does not matter, I'm using Fedora 29.
Managed node: Fedora 30/rawhide

STEPS TO REPRODUCE

Start a fedora rawhide container:

docker run --rm fedora:rawhide sleep 300

Install python2 on it:

ansible \
  -m dnf \
  -a "name=python2" \
  -i f9f2e079d337, \
  -c docker \
  -e "ansible_python_interpreter=/usr/bin/python3" \
  all

Install another package using the default ansible_python_interpreter:

ansible \
  -m dnf \
  -a "name=sos" \
  -i f9f2e079d337, \
  -c docker \
  all

Another way to test this: (could be used in the integration tests)

# INSTALLPYTHON2
#  The module `dnf` tries to install python2-dnf when it's running on systems
#  that have python2 installed. Fedora 30 and newer have python3 and limited
#  support for python2, for example python2-dnf is missing.

- name: use python3
  set_fact:
    ansible_python_interpreter: /usr/bin/python3

- name: install python2
  dnf:
    name: python2
    state: present

- name: use python2
  set_fact:
    ansible_python_interpreter: /usr/bin/python

- name: install a sample package
  dnf:
    name: python2
    state: present

EXPECTED RESULTS

Just to have python2 installed, I'm not interested in python2-dnf.

I realize this an edge case, and fixing it may cause more issues, like #22305.

ACTUAL RESULTS

f9f2e079d337 | FAILED! => {
    "changed": false, 
    "cmd": "dnf install -y python2-dnf", 
    "msg": "Error: Unable to find a match", 
    "rc": 1, 
    "stderr": "Error: Unable to find a match\n", 
    "stderr_lines": [
        "Error: Unable to find a match"
    ], 
    "stdout": "Last metadata expiration check: 0:01:03 ago on Fri Nov 30 10:19:16 2018.\nNo match for argument: python2-dnf\n", 
    "stdout_lines": [
        "Last metadata expiration check: 0:01:03 ago on Fri Nov 30 10:19:16 2018.", 
        "No match for argument: python2-dnf"
    ]
}

[ansibot]

Hi @robertdebock, thank you for submitting this issue!

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[ansibot]

Files identified in the description:

• lib/ansible/modules/packaging/os/dnf.py

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

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[maxamillion]

Ultimately I think the issue here is that Fedora is moving away from python2 and there's nothing Ansible can realistically do.

[ansibot]

cc @DJMuggs @berenddeschouwer @ignatenkobrain
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