iiab/roles/jupyterhub/tasks/install.yml

- name: "Set 'nodejs_install: True' and 'nodejs_enabled: True'"
  set_fact:
    nodejs_install: True
    nodejs_enabled: True

- name: NODEJS - run 'nodejs' role (attempt to install & enable Node.js)
  include_role:
    name: nodejs

- name: FAIL (STOP THE INSTALL) IF 'nodejs_installed is undefined'
  fail:
    msg: "JupyterHub install cannot proceed, as Node.js is not installed."
  when: nodejs_installed is undefined


- name: "Install package: python3-venv"
  package:
    name: python3-venv
    state: present

- name: Make 3 directories to hold JupyterHub config
  file:
    state: directory
    path: "{{ item }}"
  with_items:
    - "{{ jupyterhub_venv }}/etc/jupyter"    # /opt/iiab/jupyterhub
    - "{{ jupyterhub_venv }}/etc/jupyterhub"
    - "{{ jupyterhub_venv }}/etc/systemd"

- name: Use npm to install 'configurable-http-proxy'
  npm:
    name: configurable-http-proxy
    global: yes
    state: latest

- name: "pip install 3 packages into virtual environment: {{ jupyterhub_venv }} (~271 MB total, after 2 Ansible calls)"
  pip:
    name:
      - pip
      - wheel
      - jupyterhub
    virtualenv: "{{ jupyterhub_venv }}"    # /opt/iiab/jupyterhub
    virtualenv_site_packages: no
    virtualenv_command: python3 -m venv "{{ jupyterhub_venv }}"    # 2021-07-29: This works on RasPiOS 10, Debian 11, Ubuntu 20.04 and Mint 20 -- however if you absolutely must use the older Debian 10 -- you can work around errors "can't find Rust compiler" and "This package requires Rust >=1.41.0" if you (1) revert this line to 'virtualenv_command: virtualenv' AND (2) uncomment the line just below
    #virtualenv_python: python3    # 2021-07-29: Was needed when above line was 'virtualenv_command: virtualenv' (generally for Python 2)
    extra_args: "--no-cache-dir"    # 2021-11-30, 2022-07-07: The "--pre" flag had earlier been needed, for beta-like pre-releases of JupyterHub 2.0.0

# 2022-07-07: Attempting to "pip install" all 7 together (3 above + 4 below)
# fails on OS's like 64-bit RasPiOS (but interestingly works on Ubuntu 22.04!)
# https://github.com/iiab/iiab/issues/3283

- name: Break up jupyterhub/jupyterlab pip installs into 2 parts (3 packages above + 4 packages here) due to mutual dependency deadlock on some OS's
  pip:
    name:
      - jupyterlab
      - jupyterhub_firstuseauthenticator
      - jupyterhub-systemdspawner
      - ipywidgets
    virtualenv: "{{ jupyterhub_venv }}"
    virtualenv_site_packages: no
    virtualenv_command: python3 -m venv "{{ jupyterhub_venv }}"    
    extra_args: "--no-cache-dir"

- name: "Install from template: {{ jupyterhub_venv }}/etc/jupyterhub/jupyterhub_config.py"
  template:
    src: jupyterhub_config.py.j2
    dest: "{{ jupyterhub_venv }}/etc/jupyterhub/jupyterhub_config.py"

- name: "Install from template: /etc/systemd/system/jupyterhub.service"
  template:
    src: jupyterhub.service.j2
    dest: /etc/systemd/system/jupyterhub.service

# 2022-07-07: No longer needed, thx to upstream fixes
# - name: Install {{ jupyterhub_venv }}/bin/getsite.py from template, to fetch site_packages path, e.g. {{ jupyterhub_venv }}/lib/python{{ python_version }}/site-packages
#   template:
#     src: getsite.py.j2
#     dest: "{{ jupyterhub_venv }}/bin/getsite.py"
#     mode: 0755
#
# - name: Install patch_FUA.sh from template -- to (1) fix async password-changing page, and (2) force usernames to lowercase -- patching $SITE_PACKAGES/firstuseauthenticator/firstuseauthenticator.py
#   template:
#     src: patch_FUA.sh.j2
#     dest: "{{ jupyterhub_venv }}/bin/patch_FUA.sh"
#     mode: 0755
#
# - name: "Run the above two, via: {{ jupyterhub_venv }}/bin/patch_FUA.sh"
#   command: "{{ jupyterhub_venv }}/bin/patch_FUA.sh"

- name: Install patch_http-warning.sh from template, to turn off the warning about http insecurity, in {{ jupyterhub_venv }}/share/jupyterhub/templates/login.html
  template:
    src: patch-http-warning.sh.j2
    dest: "{{ jupyterhub_venv }}/bin/patch_http-warning.sh"
    mode: 0755

- name: "Now run it: {{ jupyterhub_venv }}/bin/patch_http-warning.sh"
  command: "{{ jupyterhub_venv }}/bin/patch_http-warning.sh"


# RECORD JupyterHub AS INSTALLED

- name: "Set 'jupyterhub_installed: True'"
  set_fact:
    jupyterhub_installed: True

- name: "Add 'jupyterhub_installed: True' to {{ iiab_state_file }}"
  lineinfile:
    path: "{{ iiab_state_file }}"    # /etc/iiab/iiab_state.yml
    regexp: '^jupyterhub_installed'
    line: 'jupyterhub_installed: True'