Multiple issues with MinIO credentials initialization in Experiment.py

[Alexiszcv]

Problem description

Currently, the Experiment class in Experiment.py has several issues leading to errors when running experiments:

1. Order of operations — check_minio_credentials() was called before env_setup(), causing environment variables for MinIO to not be set in time.
2. Faulty condition — the code tried to log self.auth.method even when self.auth was None, raising:

   AttributeError: 'NoneType' object has no attribute 'method'
   

3. Missing credentials — if MinIO credentials were only present in the .cfg file but not exported in the environment, the process failed.

This behavior causes experiments to crash unexpectedly.

Steps to Reproduce

1. Run:

   mlops run scripts/train.py -c config/local_config.cfg --ignore_git_check
   

2. Observe the crash in check_minio_credentials().

Proposed Solution

• Change the initialization order:

  1. Call self.config_setup().
  2. Call self.env_setup() to set environment variables.
  3. Call self.check_minio_credentials().

• Add setting of MinIO environment variables directly in env_setup() to ensure they’re available before credentials check.

Related Context

• Part of fixing an issue raised in MLOpsTutorial.
• The .cfg updates to include MinIO credentials are tracked in the MLOpsTutorial repo, while the code fix is in MLOps.