Silencing reframe's output also silences any other file handler

[vkarak]

How to reproduce

Add this to your config:

            'handlers': [
                {
                    'type': 'file',
                    'name': 'reframe.out',
                    'level': 'info',
                    'format': '%(message)s'
                }
            ],

Then run reframe with -qq. Instead of producing the normal output in reframe.out, this is empty. If you remove the -qq options, then you get your output in reframe.out as expected.

The cause

The problem comes (most likely) from the following part of the code:

reframe/reframe/core/logging.py

Lines 758 to 759 in 6c3d163

	return [h for h in self.logger.handlers
	if isinstance(h, logging.StreamHandler)]

called by the adjust_verbosity() logger's method. The problem is that a FileHandler is a StreamHandler in Python terms, therefore it is also silenced. The intent here was to silence only the stream handlers to suppress the output.

[teojgo]

@vkarak I think this should have been fixed by #2786 right?

[vkarak]

Yes, but since the main branch is not master anymore, this is not closed automatically and since we haven't yet merged master into develop, I just moved in the Kanban board (check status) so that we close it once we update develop.