khiops_env --env Execution Error is Not (Properly) Handled

[popescu-v]

Description

Currently, khiops_env --env is executed with the appropriate path to the script, but only stdout is captured. Neither stderr, nor returncode are captured and handled.

Thus, if khiops_env --env fails for some reason (see e.g. KhiopsML/khiops#444, most notably comment KhiopsML/khiops#444 (comment)), there is no hint provided to the user. Just that the environment would not be set, which would entail failure later on.

Questions/Ideas

• The solution is to capture stderr and .returncode from the khiops_env --env subprocess in _initialize_khiops_environment, so that the relevant KhiopsEnvironmentError is raised, with the message contained in the process' stderr.