tildes/ansible/roles/python/tasks/main.yml

---
- name: Check if the correct version of Python is already installed
  stat:
    path: /usr/local/bin/python{{ python_version }}
  register: python_binary

- name: Download and install Python
  when: not python_binary.stat.exists
  block:
    - name: Download Python source code
      get_url:
        dest: /tmp/python.tar.gz
        url: https://www.python.org/ftp/python/3.8.10/Python-3.8.10.tgz
        checksum: sha256:b37ac74d2cbad2590e7cd0dd2b3826c29afe89a734090a87bf8c03c45066cb65

    - name: Create temp directory to extract Python to
      file:
        path: /tmp/python
        state: directory

    - name: Extract Python
      unarchive:
        remote_src: true
        src: /tmp/python.tar.gz
        dest: /tmp/python
        extra_opts:
          - --strip-components=1

    - name: Install build dependencies for Python
      apt:
        name:
          - make
          - build-essential
          - libssl-dev
          - zlib1g-dev
          - libbz2-dev
          - libreadline-dev
          - libsqlite3-dev
          - wget
          - curl
          - llvm
          - libncurses5-dev
          - libncursesw5-dev
          - xz-utils
          - tk-dev

    - name: Build and install Python (this can take a long time)
      shell:
        chdir: /tmp/python
        cmd: |
          ./configure --enable-optimizations --with-ensurepip=install
          make
          make altinstall

- name: Create dir for venvs
  file:
    path: /opt/venvs
    state: directory
    owner: "{{ app_username }}"
    group: "{{ app_username }}"
    mode: 0755

- name: Install packages needed for compiling psycopg2
  apt:
    name:
      - gcc
      - libpq-dev

- name: Create venv
  become_user: "{{ app_username }}"
  command:
    cmd: python{{ python_version }} -m venv {{ venv_dir }}
    creates: "{{ venv_dir }}"

- name: Check installed packages in venv
  command:
    cmd: "{{ bin_dir }}/pip freeze"
  register: pip_freeze
  changed_when: false

- name: Install Python packages into venv
  become_user: "{{ app_username }}"
  pip:
    executable: "{{ bin_dir }}/pip"
    requirements: "{{ app_dir }}/{{ pip_requirements_filename }}"

- name: Install Tildes into venv as editable
  become_user: "{{ app_username }}"
  pip:
    executable: "{{ bin_dir }}/pip"
    name: "{{ app_dir }}"
    editable: true
  when: "'-e '+app_dir not in pip_freeze.stdout_lines"