debugging "Command failed" is tedious

[payload]

Hi.

I ran into command invocation fails. Red text, no more info. After tediously grepping the code of buildozer i learned about show_output as a kwarg for buildozer.cmd. I also found the relevant cmd call and inserted show_output=True.

Now I could finally see the error messages, solve the problem and be done with it.
(I used a - character in the package.name in the spec file)

I propose an environment variable and command line option to activate helpfull output per "build" phase or something like that.

[payload]

meh... --verbose does it... I tried -vvvv blindly and didn't read Usage :(