install_python3.yml

# Copyright 2022 Shadow Robot Company Ltd.
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation version 2 of the License.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.

---

- name: Install Python 3 and pip3
  hosts: all
  become: yes
  gather_facts: no
  pre_tasks:
    - name: Install Python 3 and pip3
      when: (is_ansible_control_node is undefined) or (not (is_ansible_control_node | bool))
      block:
        - name: Set user home from env var
          set_fact:
            sr_user_home: "{{ lookup('env','HOME') }}"

        - name: Check if Python 3 is installed
          raw: 'python3 --version'
          register: output
          ignore_errors: yes
          changed_when: output.rc != 0

        - name: Install Python 3 in case if it is not installed
          raw: 'apt-get -y update && apt-get install -y python3'
          when: output.rc != 0

        - name: Check pip3 installed (will prevent reinstallation in case if pip3 was installed without Apt)
          command: pip3 --version
          register: pip_status
          ignore_errors: yes
          changed_when: pip_status.rc != 0

        - name: Make sure python3-pip is present (if run-ansible.sh was not run locally)
          apt:
            name: 'python3-pip'
            state: 'present'
            update_cache: yes
          when:
            - pip_status.rc != 0
            - not pip_status.stderr | regex_search("module 'lib' has no attribute 'X509_V_FLAG_.*")
          become: yes

        # This checks for a condition where pip3 is installed but not working due to an issue with a criptography library
        - name: Check for pip3 cryptography issue
          command: pip3 --version
          register: pip_status
          ignore_errors: yes
          # This is to avoid a failure of the idempotency tests
          changed_when: false

        # Package python3-openssl comes preinstalled in ubuntu server (together with two packages that depend on it landscape-common and python3-twisted).
        # It depends on the cryptography package, and the problem is that the cryptography package is installed with both pip3 and apt.
        # But the version installed with pip is found first in the python path. And the pip version of cryptography is incompatible with the openssl version installed with apt,
        # which oddly enough throws this error just by trying to do anything with pip. So we're removing the conflicting package.
        # And we do it with a raw command because the apt module doesn't work because it tries to use the openssl library from the host.
        - name: Fix pip3 cryptography issue
          raw: 'apt-get -y update && apt-get purge -y python3-openssl'
          register: output
          when:
            - pip_status.rc != 0
            - pip_status.stderr | regex_search("module 'lib' has no attribute 'X509_V_FLAG_.*")
          become: yes

- name: Set Python 3 variable
  hosts: all
  gather_facts: no
  pre_tasks:

    - name: Set user home from env var
      set_fact:
        sr_user_home: "{{ lookup('env','HOME') }}"

    - name: Set Python 3 conda
      when:
        - '"root" not in sr_user_home'
        - is_ansible_control_node is defined
        - is_ansible_control_node | bool
      block:
        - name: Set python3/pip path
          set_fact:
            sr_python_and_pip_path: "{{ sr_user_home }}/.shadow_miniconda/miniconda/envs/aurora_conda_ws/bin"

        - name: Set Python 3 interpreter
          set_fact:
            ansible_python_interpreter: "{{ sr_python_and_pip_path }}/python3"

        - name: Set Python3 pip executable
          set_fact:
            ansible_pip3_executable: "{{ sr_python_and_pip_path }}/pip3"

    - name: Set Python 3 non-conda
      when: ("root" in sr_user_home) or (is_ansible_control_node is undefined) or (not (is_ansible_control_node | bool))
      block:
        - name: Set Python 3 interpreter
          set_fact:
            ansible_python_interpreter: "/usr/bin/python3"

        - name: Set Python3 pip executable
          set_fact:
            ansible_pip3_executable: "/usr/bin/pip3"