VMimage get --debug option

[richtja]

This commit adds a new option to vmimage get feature called debug. It brings possibility to run vmimage command in debug mode to get more detailed information about possible failures. In debug mode, all exceptions caused by vmimage utility will be raised to console. That should provide enough information for further debugging of possible issues.

Reference: #6051

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vmimage get without debug:

$ avocado vmimage get --distro Fedora --distro-version 2 
The requested image could not be downloaded

vmimage get with debug:

$ avocado vmimage get --distro Fedora --distro-version 2 --debug
avocado.utils.vmimage: Version not available at https://dl.fedoraproject.org/pub/fedora/linux/releases/
The requested image could not be downloaded

[codecov]

Codecov Report

Attention: Patch coverage is 26.66667% with 11 lines in your changes missing coverage. Please review.

Project coverage is 54.44%. Comparing base (6b55d5a) to head (7420e5f).
Report is 11 commits behind head on master.

Files with missing lines	Patch %	Lines
avocado/plugins/vmimage.py	14.28%	6 Missing ⚠️
avocado/utils/vmimage.py	37.50%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6061      +/-   ##
==========================================
- Coverage   54.46%   54.44%   -0.03%     
==========================================
  Files         202      202              
  Lines       21883    21890       +7     
==========================================
- Hits        11919    11918       -1     
- Misses       9964     9972       +8     

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[clebergnu]

Hi @richtja ,

Thanks for working on this. While this gets the most important thing done, that is, info about a failure, IMO a --debug option should:

1. Also work during success cases, that is, it should show what's going on whether the operation is succeeding or failing
2. Should not crash the application

Have you tried adding various logging entries to the avocado.utils.vmimage module and making them visible when --debug is given?

[richtja]

Hi @richtja ,

Thanks for working on this. While this gets the most important thing done, that is, info about a failure, IMO a --debug option should:

1. Also work during success cases, that is, it should show what's going on whether the operation is succeeding or failing

2. Should not crash the application

Have you tried adding various logging entries to the avocado.utils.vmimage module and making them visible when --debug is given?

Hi @clebergnu, thanks for your review. I have changed this PR to use logging instead of raising errors. Please have a look.

[clebergnu]

LGTM, thanks!