Jupyter interaction with ROOT

[tomeichlersmith]

Describe the bug
If a person attempts to open Jupyter from within an ldmx image (dev or pro), they are prevented because the directories we add to specific jupyter environment variables are not write-able.

Error:

OSError: [Errno 30] Read-only filesystem: '/usr/local/etc/notebook:'

Location where this is set:

docker/Dockerfile

Lines 226 to 227 in 1c729e2

	ENV JUPYTER_PATH=${ROOTSYS}/etc/notebook:${JUPYTER_PATH}
	ENV JUPYTER_CONFIG_DIR=${ROOTSYS}/etc/notebook:${JUPYTER_CONFIG_DIR}

To Reproduce
Steps to reproduce the behavior:

1. denv init ldmx/dev:latest
2. denv python3 -m pip install jupyterlab
3. denv jupyter lab
4. See error

Expected behavior
We can avoid this error by not setting these environment variables.
A workaround is to edit the file at <denv workspace>/.profile to unset these variables.

denv true # make sure profile is copied over
cat >> .profile <<PROF
# unset errorneously set variables that should not be used since ROOT
# is installed in a read-only location
unset JUPYTER_CONFIG_DIR
unset JUPYTER_PATH
PROF

What tag of the container are you using? What application are you using to run the container?
Both of these are answered by denv config print.

denv_workspace="/export/scratch/users/eichl008"
denv_name="eichl008"
denv_image="ldmx/pro:v4.0.1"
denv_mounts=""
denv_shell="/bin/bash -i"
denv_network="true"
apptainer version 1.3.5-1.el8