From 21ee498b73666709d6b4ae9257b9d78281c4b89c Mon Sep 17 00:00:00 2001
From: George Hunt <georgejhunt@gmail.com>
Date: Thu, 7 Jul 2022 23:51:29 +0100
Subject: [PATCH] break pip install into two plays

---
 roles/jupyterhub/tasks/install.yml | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/roles/jupyterhub/tasks/install.yml b/roles/jupyterhub/tasks/install.yml
index 671e8a3ea..7a12252cd 100644
--- a/roles/jupyterhub/tasks/install.yml
+++ b/roles/jupyterhub/tasks/install.yml
@@ -33,22 +33,29 @@
     global: yes
     state: latest
 
-- name: "pip install 7 packages into virtual environment: {{ jupyterhub_venv }} (~217 MB)"
+- name: "pip install 3 packages into virtual environment: {{ jupyterhub_venv }} (~217 MB total in two ansible plays)"
   pip:
     name:
       - pip
       - wheel
-      - ipywidgets
       - jupyterhub
-      - jupyterlab
-      - jupyterhub_firstuseauthenticator
-      - jupyterhub-systemdspawner
     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_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 --pre"    # 2021-11-30: The "--pre" flag should likely be removed after JupyterHub 2.0.0 is released.
 
+- name: "pip break apart jupyterlab install into two parts - must have conflicting mutual dependency (4 packages)"
+  pip:
+    name:
+        - jupyterlab
+        - jupyterhub_firstuseauthenticator
+        - jupyterhub-systemdspawner
+        - ipywidgets
+    virtualenv: "{{ jupyterhub_venv }}"    # /opt/iiab/jupyterhub
+    virtualenv_site_packages: no
+    virtualenv_command: python3 -m venv "{{ jupyterhub_venv }}"    
+
 - name: "Install from template: {{ jupyterhub_venv }}/etc/jupyterhub/jupyterhub_config.py"
   template:
     src: jupyterhub_config.py.j2