logger rework. Package local logger.

[msarahan]

Fixes logger messages not showing up due to root logger being configured at higher logging level. Localizes logger configuration to conda-build.

This probably trims things back too far. Running conda-build in debug mode should probably also run conda in debug mode, for example. I leave that for a future PR.

CC @mingwandroid @kalefranz

[kalefranz]

Maybe you're not done with this PR yet, so this could be a premature comment.
Using NullHandler is exactly the right thing to do for a library. It makes your library a good logging citizen. Also, the package's root-level __init__.py file is almost always the right place to invoke the basic logging configuration. (In conda's case I'm not, because I don't want to bog down the ..activate etc cli stuff with logger initialization. It's way too slow already.)

However, unless you add another handler somewhere else, the problem with conda-build logs will remain. I'm guessing you're just not done with the PR though.

[msarahan]

Thanks for the comment. I'm not sure why, but things seem to be working with the code as is. Any insight?

I have a package on my channel, intentionally built with an 80-character prefix. This recipe will try to bring it in as a dependency:

package:
  name: test-pkg
  version: 1.0

requirements:
  build:
    - conda-build-test-has-prefix-files

Now, if you build that recipe (conda build -c msarahan .), you see the logger output, as I would hope. is there something else that isn't showing because of the way I have things now?

 msarahan@0109-msarahan-2  ~/code/conda-build/tests/test_pkg   logger  conda build -c msarahan .
BUILD START: test-pkg-1.0-0
updating index in: /Users/msarahan/miniconda2/conda-bld/osx-64
updating index in: /Users/msarahan/miniconda2/conda-bld/noarch

The following packages will be downloaded:

    package                    |            build
    ---------------------------|-----------------
    conda-build-test-has-prefix-files-1.0|                0           3 KB  local

The following NEW packages will be INSTALLED:

    conda-build-test-has-prefix-files: 1.0-0 local

WARNING conda_build.build:create_env(648): Build prefix failed with prefix length 255
WARNING conda_build.build:create_env(649): Error was:
WARNING conda_build.build:create_env(650): Placeholder of length '80' too short in package local::conda-build-test-has-prefix-files-1.0-0.
The package must be rebuilt with conda-build > 2.0.
WARNING conda_build.build:create_env(651): One or more of your package dependencies needs to be rebuilt with a longer prefix length.
WARNING conda_build.build:create_env(653): Falling back to legacy prefix length of 80 characters.
WARNING conda_build.build:create_env(654): Your package will not install into prefixes > 80 characters.

[github-actions]

Hi there, thank you for your contribution!

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Please open a new issue or pull request if needed.

Thanks!