Support building via PyPA/build

AUTHORS.rst

@@ -6,3 +6,4 @@ Authors
 * Antonio Botelho - https://github.com/botant
 * Thomas Grainger - https://github.com/graingert
 * Michael Rans - https://github.com/mcarans
+* Ben Rowland - https://github.com/bennyrowland

CHANGELOG.rst

@@ -2,6 +2,12 @@
 Changelog
 =========
 
+Unreleased changes
+------------------
+
+* Added option to build wheels (and sdists) in an isolated environment using `build <https://github.com/pypa/build>`_.
+  Contributed by Ben Rowland in `#17 <https://github.com/ionelmc/tox-wheel/pull/17>`_.
+
 0.7.0 (2021-12-29)
 ------------------
 

src/tox_wheel/plugin.py

@@ -1,5 +1,6 @@
 from contextlib import contextmanager
 from functools import partial
+import os.path
 
 import pluggy
 import py
@@ -32,9 +33,12 @@ def tox_addoption(parser):
     )
     parser.add_testenv_attribute(
         name="wheel_pep517",
-        type="bool",
-        default=False,
-        help="Build wheel using PEP 517/518"
+        type="string",
+        default="",
+        help=(
+            "Build wheel using PEP 517/518 (pass true to build with pip or "
+            "build to build with build)"
+        ),
     )
     parser.add_testenv_attribute(
         name="wheel_dirty",
@@ -60,6 +64,13 @@ def patch(obj, attr, value):
         setattr(obj, attr, original)
 
 
+@hookimpl
+def tox_testenv_install_deps(venv, action):
+    if venv.envconfig.wheel_pep517 == "build":
+        venv.run_install_command(["build[virtualenv]>=0.7.0"], action)
+    return None
+
+
 @hookimpl
 def tox_package(session, venv):
     if session.config.option.wheel or venv.envconfig.wheel:
@@ -153,16 +164,36 @@ def wheel_build_pep517(config, session, venv):
             action.setactivity("wheel-make", "cleaning up build directory ...")
             ensure_empty_dir(config.setupdir.join("build"))
         ensure_empty_dir(config.distdir)
+        if venv.envconfig.wheel_pep517 == "build":
+            commands = [
+                "python",
+                "-Im",
+                "build",
+                "--outdir",
+                config.distdir,
+                config.setupdir,
+            ]
+        else:
+            commands = [
+                "pip",
+                "wheel",
+                config.setupdir,
+                "--no-deps",
+                "--use-pep517",
+                "--wheel-dir",
+                config.distdir,
+            ]
         venv.test(
             name="wheel-make",
-            commands=[["pip", "wheel", config.setupdir, "--no-deps", "--use-pep517", "--wheel-dir", config.distdir]],
+            commands=[commands],
             redirect=False,
             ignore_outcome=False,
             ignore_errors=False,
             display_hash_seed=False,
         )
         try:
-            dists = config.distdir.listdir()
+            # we need to filter our list of dists to include only wheels
+            dists = [dist for dist in config.distdir.listdir() if os.path.splitext(dist)[1] == ".whl"]
         except py.error.ENOENT:
             reporter.error(
                 "No dist directory found. Please check pyproject.toml, e.g with:\n"

tests/test_tox_wheel.py

@@ -54,6 +54,32 @@ def testdir_pep517(testdir):
     return testdir
 
 
+@pytest.fixture
+def testdir_pep517_build(testdir):
+    testdir.tmpdir.join('tox.ini').write("""
+[tox]
+envlist = py-{a,b}
+
+[testenv]
+wheel = true
+wheel_pep517 = build
+""")
+    testdir.tmpdir.join('setup.py').write("""
+from setuptools import setup
+
+setup(name='foobar', packages=[])
+""")
+    testdir.tmpdir.join('pyproject.toml').write("""
+[build-system]
+requires = [
+    "setuptools >= 35.0.2"
+]
+build-backend = "setuptools.build_meta"
+""")
+    testdir.tmpdir.join('build').ensure(dir=1)
+    return testdir
+
+
 @pytest.fixture(params=['', '--parallel 1 --parallel-live'], ids=['sequential', 'parallel'])
 def options(request):
     return ['-e', 'py-a,py-b'] + request.param.split()
@@ -99,6 +125,16 @@ def test_enabled_pep517(testdir_pep517, options):
     assert result.ret == 0
 
 
+def test_enabled_pep517_build(testdir_pep517_build, options):
+    result = testdir_pep517_build.run('tox', *options)
+    result.stdout.fnmatch_lines([
+        'py* wheel-make: *',
+    ])
+    build_string = 'Successfully built foobar-0.0.0.tar.gz and foobar-0.0.0-py3-none-any.whl'
+    assert result.stdout.str().count(build_string) == 2
+    assert result.ret == 0
+
+
 def test_build_env_legacy(testdir_legacy, options):
     testdir_legacy.tmpdir.join('setup.cfg').write("""
 [bdist_wheel]
@@ -141,6 +177,25 @@ def test_build_env_pep517(testdir_pep517, options):
     assert result.ret == 0
 
 
+def test_build_env_pep517_build(testdir_pep517_build, options):
+    testdir_pep517_build.tmpdir.join('setup.cfg').write("""
+[bdist_wheel]
+universal = 1
+""")
+    testdir_pep517_build.tmpdir.join('tox.ini').write("""
+wheel_build_env = build
+
+[testenv:build]
+""", mode='a')
+    result = testdir_pep517_build.run('tox', *options)
+    result.stdout.fnmatch_lines([
+        'build wheel-make: *',
+    ])
+    build_string = 'Successfully built foobar-0.0.0.tar.gz and foobar-0.0.0-py2.py3-none-any.whl'
+    assert result.stdout.str().count(build_string) == 1
+    assert result.ret == 0
+
+
 @pytest.mark.parametrize('wheel_build_env', ['', 'wheel_build_env'])
 def test_skip_usedevelop(testdir_legacy, options, wheel_build_env):
     testdir_legacy.tmpdir.join('tox.ini').write("""