Add tool for building manylinux wheels

Author: asottile

README.md

@@ -59,3 +59,31 @@ Double check that your import is correct.
 ### `package github.com/a/b/c: /tmp/.../github.com/a/b exists but /tmp/.../github.com/a/b/.git does not - stale checkout?`
 
 You've probably mistyped an import.  Double check that your import is correct.
+
+### Building manylinux wheels
+
+`setuptools-golang` also provides a tool for building
+[PEP 513](https://www.python.org/dev/peps/pep-0513/) manylinux1 wheels so your
+consumers don't need to have a go compiler installed to use your library.
+
+Simply run `setuptools-golang-build-manylinux-wheels` from your source
+directory.  The resulting wheels will end up in `./dist`.
+
+```
+$ setuptools-golang-build-manylinux-wheels
+
+...
+
++ ls /dist -al
+total 8092
+drwxrwxr-x  2 1000 1000    4096 Feb  1 04:16 .
+drwxr-xr-x 41 root root    4096 Feb  1 04:15 ..
+-rw-r--r--  1 1000 1000 2065095 Feb  1 04:16 setuptools_golang_examples-0.1.1-cp27-cp27mu-manylinux1_x86_64.whl
+-rw-r--r--  1 1000 1000 2063299 Feb  1 04:16 setuptools_golang_examples-0.1.1-cp34-cp34m-manylinux1_x86_64.whl
+-rw-r--r--  1 1000 1000 2064862 Feb  1 04:16 setuptools_golang_examples-0.1.1-cp35-cp35m-manylinux1_x86_64.whl
+-rw-r--r--  1 1000 1000 2064873 Feb  1 04:16 setuptools_golang_examples-0.1.1-cp36-cp36m-manylinux1_x86_64.whl
+-rw-rw-r--  1 1000 1000    4273 Feb  1 04:14 setuptools-golang-examples-0.1.1.tar.gz
+*******************************************************************************
+Your wheels have been built into ./dist
+*******************************************************************************
+```

setup.py

@@ -24,6 +24,10 @@
     py_modules=['setuptools_golang'],
     install_requires=[],
     entry_points={
+        'console_scripts': [
+            'setuptools-golang-build-manylinux-wheels = '
+            'setuptools_golang:build_manylinux_wheels',
+        ],
         'distutils.setup_keywords': [
             'build_golang = setuptools_golang:set_build_ext',
         ],

setuptools_golang.py

@@ -95,3 +95,44 @@ def set_build_ext(dist, attr, value):
     root = value['root']
     base = dist.cmdclass.get('build_ext', _build_ext)
     dist.cmdclass['build_ext'] = _get_build_ext_cls(base, root)
+
+
+GOLANG = 'https://storage.googleapis.com/golang/go1.7.5.linux-amd64.tar.gz'
+WHEEL_ARGS = '--no-deps --wheel-dir /tmp /dist/*.tar.gz'
+
+
+def build_manylinux_wheels(argv=None):  # pragma: no cover
+    assert os.path.exists('setup.py')
+    shutil.rmtree('dist')
+    os.makedirs('dist')
+    _check_call(('python', 'setup.py', 'sdist'), cwd='.', env={})
+    _check_call(
+        (
+            'docker', 'run',
+            '--volume', '{}:/dist:rw'.format(os.path.abspath('dist')),
+            # I'd use --user, but this breaks git:
+            # http://stackoverflow.com/a/20272540/812183
+            '--env', 'UID={}'.format(os.getuid()),
+            '--env', 'GID={}'.format(os.getgid()),
+            'quay.io/pypa/manylinux1_x86_64:latest',
+            'bash', '-exc',
+            'cd /tmp\n'
+            'wget {golang} -q --no-check-certificate -O /tmp/golang.tar.gz\n'
+            'tar -xf /tmp/golang.tar.gz\n'
+            'export GOROOT=/tmp/go\n'
+            'export PATH="$GOROOT/bin:$PATH"\n'
+            '/opt/python/cp27-cp27mu/bin/pip wheel {wheel_args}\n'
+            '/opt/python/cp34-cp34m/bin/pip wheel {wheel_args}\n'
+            '/opt/python/cp35-cp35m/bin/pip wheel {wheel_args}\n'
+            '/opt/python/cp36-cp36m/bin/pip wheel {wheel_args}\n'
+            'mkdir /tmp/whls\n'
+            'ls *.whl | xargs -n1 --verbose auditwheel repair -w /tmp/whls\n'
+            'cp /tmp/whls/* /dist\n'
+            'chown "$UID:$GID" /dist/*\n'
+            'ls /dist -al\n'.format(golang=GOLANG, wheel_args=WHEEL_ARGS),
+        ),
+        cwd='.', env={},
+    )
+    print('*' * 79)
+    print('Your wheels have been built into ./dist')
+    print('*' * 79)