airnandez / lsst-jupyter-kernel Goto Github PK

Hi, is it possible to have a simular kernel for lsst_sims ?

Many thanks.

Sylvie

This is the record of an issue found using this kernel with an installation of lsst_distrib made with lsstinstall (see announcement here).

The issue is that the script to load the LSST environment loadLSST.bash generated by lsstinstall accepts as a command line argument the name of the conda environment to activate. Here is the relevant line of loadLSST.bash:

...
export LSST_CONDA_ENV_NAME=${1:-${LSST_CONDA_ENV_NAME:-lsst-scipipe-0.7.0}}
...

When this script is called from another shell script, for instance:

#!/bin/bash

# This script expects some command line arguments arg1 arg2 arg3
...


cd /path/to/my/release
source loadLSST.bash
...

Since loadLSST.bash is sourced, it will receive and interpret the first command line argument (e.g. arg1 in the example above) passed to the caller script as if it was the name of the conda environment to activate. This feature makes this kernel break since it expects other arguments passed by Jupyter, which should not be passed to loadLSST.bash.

The fix is to save and consume all the arguments so that when loadLSST.bash is called there is no remaining arguments to the caller shell script. The saved arguments are restored afterwards and passed to the kernel launcher.