Fix sdist package

Setuptools_scm forcibly includes all files under version control into the sdist package, ignoring `MANIFEST.in` and `find_packages`.
This fixes this by replacing the `find_files` function with a dummy one (`see setup.py::EggInfo.__init__()`).

See pypa/setuptools-scm#190

MANIFEST.in

@@ -1,2 +1,3 @@
 include README.rst
 include requirements.txt
+include constraints.txt

Makefile

@@ -41,7 +41,7 @@ clean-test:
 
 LINT_PATHS = raiden/ tools/
 ISORT_PARAMS = --ignore-whitespace --settings-path ./ --skip-glob '*/node_modules/*' --recursive $(LINT_PATHS)
-BLACK_PATHS = raiden/ tools/
+BLACK_PATHS = raiden/ tools/ setup.py
 
 lint: mypy mypy-all
 	flake8 raiden/ tools/

setup.py

@@ -1,10 +1,10 @@
 #!/usr/bin/env python
 from setuptools import find_packages, setup
+from setuptools.command.egg_info import egg_info
 from setuptools.command.test import test as TestCommand
 
 
 class PyTest(TestCommand):
-
     def finalize_options(self):
         TestCommand.finalize_options(self)
         self.test_args = []
@@ -13,61 +13,75 @@ def finalize_options(self):
     def run_tests(self):
         # import here, cause outside the eggs aren't loaded
         import pytest
+
         errno = pytest.main(self.test_args)
         raise SystemExit(errno)
 
 
-with open('README.rst') as readme_file:
+class EggInfo(egg_info):
+    def __init__(self, *args, **kwargs) -> None:
+        super().__init__(*args, **kwargs)
+        # FFS, setuptools_scm forcibly includes all files under version control into the sdist
+        # package, ignoring `MANIFEST.in` and `find_packages`.
+        # See https://github.com/pypa/setuptools_scm/issues/190
+        # We 'fix' this by replacing the `find_files` function with a dummy one.
+        # The reason this is done here and not on the top level is that setuptools_scm is a
+        # setup time requirement so it may not have been installed when this setup.py is initially
+        # executed.
+        try:
+            import setuptools_scm.integration
+
+            setuptools_scm.integration.find_files = lambda _: []
+        except ImportError:
+            pass
+
+
+with open("README.rst") as readme_file:
     readme = readme_file.read()
 
 
-history = ''
+history = ""
 
 
-with open('constraints.txt') as req_file:
-    install_requires = list({
-        requirement
-        for requirement in req_file
-        if requirement.strip() and not requirement.lstrip().startswith('#')
-    })
+with open("constraints.txt") as req_file:
+    install_requires = list(
+        {
+            requirement
+            for requirement in req_file
+            if requirement.strip() and not requirement.lstrip().startswith("#")
+        }
+    )
 
 test_requirements = []
 
 # Do not edit: this is maintained by bumpversion (see .bumpversion_client.cfg)
-version = '0.100.3-rc5'
+version = "0.100.3-rc5"
 
 setup(
-    name='raiden',
-    description='',
-    long_description=readme + '\n\n' + history,
-    author='Brainbot Labs Est.',
-    author_email='contact@brainbot.li',
-    url='https://github.com/raiden-network/raiden',
-    packages=find_packages(exclude=('tools',)),
+    name="raiden",
+    description="",
+    long_description=readme + "\n\n" + history,
+    author="Brainbot Labs Est.",
+    author_email="contact@brainbot.li",
+    url="https://github.com/raiden-network/raiden",
+    packages=find_packages(include=("raiden", "raiden.*")),
     package_data={"raiden": ["py.typed"]},
-    include_package_data=True,
-    license='MIT',
+    license="MIT",
     zip_safe=False,
-    keywords='raiden',
+    keywords="raiden",
     classifiers=[
-        'Development Status :: 3 - Alpha',
-        'Intended Audience :: Developers',
-        'License :: OSI Approved :: MIT License',
-        'Natural Language :: English',
-        'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.7',
+        "Development Status :: 3 - Alpha",
+        "Intended Audience :: Developers",
+        "License :: OSI Approved :: MIT License",
+        "Natural Language :: English",
+        "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.7",
     ],
-    cmdclass={
-        'test': PyTest,
-    },
+    cmdclass={"test": PyTest, "egg_info": EggInfo},
     use_scm_version=True,
-    setup_requires=['setuptools_scm'],
+    setup_requires=["setuptools_scm"],
     install_requires=install_requires,
     tests_require=test_requirements,
-    python_requires='>=3.7',
-    entry_points={
-        'console_scripts': [
-            'raiden = raiden.__main__:main',
-        ],
-    },
+    python_requires=">=3.7",
+    entry_points={"console_scripts": ["raiden = raiden.__main__:main"]},
 )