Error in dist_info command - TypeError

[jaraco]

Consider this setup.py:

$ cat setup.py
import setuptools
setuptools.setup(
name='package',
version='0.0.0',
)

produces this error:

$ rwt wheel -- setup.py dist_info       
Collecting wheel
  Using cached wheel-0.30.0-py2.py3-none-any.whl
Installing collected packages: wheel
Successfully installed wheel-0.30.0
running dist_info
writing setuptools.egg-info/PKG-INFO
writing dependency_links to setuptools.egg-info/dependency_links.txt
writing entry points to setuptools.egg-info/entry_points.txt
writing requirements to setuptools.egg-info/requires.txt
writing top-level names to setuptools.egg-info/top_level.txt
reading manifest file 'setuptools.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no files found matching '*' under directory 'setuptools/_vendor'
writing manifest file 'setuptools.egg-info/SOURCES.txt'
creating '/Users/jaraco/Dropbox/code/main/setuptools/setuptools.dist-info'
Traceback (most recent call last):
  File "setup.py", line 188, in <module>
    dist = setuptools.setup(**setup_params)
  File "/Users/jaraco/Dropbox/code/main/setuptools/setuptools/__init__.py", line 129, in setup
    return distutils.core.setup(**attrs)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/core.py", line 148, in setup
    dist.run_commands()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/dist.py", line 955, in run_commands
    self.run_command(cmd)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/dist.py", line 974, in run_command
    cmd_obj.run()
  File "/Users/jaraco/Dropbox/code/main/setuptools/setuptools/command/dist_info.py", line 35, in run
    bdist_wheel.egg2dist(egg_info.egg_info, dist_info_dir)
  File "/var/folders/c6/v7hnmq453xb6p2dbz1gqc6rr0000gn/T/rwt-2xurzhtb/wheel/bdist_wheel.py", line 443, in egg2dist
    shutil.copy(license, os.path.join(self.distinfo_dir, license_filename))
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/posixpath.py", line 78, in join
    a = os.fspath(a)
TypeError: expected str, bytes or os.PathLike object, not NoneType

In wheel/bdist_wheel:443, self.distinfo_dir is None.

[jaraco]

I think I only encountered this issue because I happened to be in the setuptools directory. Here's the full steps to replicate:

$ mkdir test-1196
$ cd test-1196
$ touch LICENSE
$ cat > setup.py
import setuptools
setuptools.setup(
name='package',
version='0.0.0',
)

$ cat > setup.cfg
[metadata]
license_file = LICENSE
$ rwt wheel==0.30.0 -- setup.py dist_info
Collecting wheel==0.30.0
  Using cached wheel-0.30.0-py2.py3-none-any.whl
Installing collected packages: wheel
Successfully installed wheel-0.30.0
running dist_info
creating package.egg-info
writing package.egg-info/PKG-INFO
writing dependency_links to package.egg-info/dependency_links.txt
writing top-level names to package.egg-info/top_level.txt
writing manifest file 'package.egg-info/SOURCES.txt'
reading manifest file 'package.egg-info/SOURCES.txt'
writing manifest file 'package.egg-info/SOURCES.txt'
creating '/Users/jaraco/Dropbox/code/main/setuptools/test-1196/package.dist-info'
Traceback (most recent call last):
  File "setup.py", line 4, in <module>
    version='0.0.0',
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/setuptools/__init__.py", line 129, in setup
    return distutils.core.setup(**attrs)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/core.py", line 148, in setup
    dist.run_commands()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/dist.py", line 955, in run_commands
    self.run_command(cmd)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/distutils/dist.py", line 974, in run_command
    cmd_obj.run()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/setuptools/command/dist_info.py", line 35, in run
    bdist_wheel.egg2dist(egg_info.egg_info, dist_info_dir)
  File "/var/folders/c6/v7hnmq453xb6p2dbz1gqc6rr0000gn/T/rwt-99p7t7mg/wheel/bdist_wheel.py", line 443, in egg2dist
    shutil.copy(license, os.path.join(self.distinfo_dir, license_filename))
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/posixpath.py", line 78, in join
    a = os.fspath(a)
TypeError: expected str, bytes or os.PathLike object, not NoneType