Remove --boxed and pytest-forked dependency

Fixes pytest-dev#468
Fixes pytest-dev#543

CHANGELOG.rst

@@ -4,7 +4,7 @@ pytest-xdist 2.5.0 (2021-12-10)
 Deprecations and Removals
 -------------------------
 
-- `#468 <https://github.com/pytest-dev/pytest-xdist/issues/468>`_: The ``--boxed`` command line argument is deprecated. Install pytest-forked and use ``--forked`` instead. pytest-xdist 3.0.0 will remove the ``--boxed`` argument and pytest-forked dependency.
+- `#468 <https://github.com/pytest-dev/pytest-xdist/issues/468>`_: The ``--boxed`` command line argument is deprecated. Install `pytest-forked <https://pypi.org/project/pytest-forked>`__ and use ``--forked`` instead. pytest-xdist 3.0.0 will remove the ``--boxed`` argument and ``pytest-forked`` dependency.
 
 
 Features

changelog/468.removal.rst

@@ -0,0 +1 @@
+The ``--boxed`` command-line option has been removed. If you still need this functionality, install `pytest-forked <https://pypi.org/project/pytest-forked>`__ separately.

changelog/468.trivial.rst

@@ -0,0 +1 @@
+The ``py`` dependency has been dropped.

docs/index.rst

@@ -55,7 +55,6 @@ Features
 
     distribution
     subprocess
-    boxed
     remote
     crash
     how-to

setup.cfg

@@ -44,7 +44,6 @@ python_requires = >=3.6
 install_requires =
     execnet>=1.1
     pytest>=6.2.0
-    pytest-forked
 setup_requires = # left empty, enforce using isolated build system
 
 [options.packages.find]

src/xdist/plugin.py

@@ -134,11 +134,6 @@ def pytest_addoption(parser):
         metavar="GLOB",
         help="add expression for ignores when rsyncing to remote tx nodes.",
     )
-    group.addoption(
-        "--boxed",
-        action="store_true",
-        help="backward compatibility alias for pytest-forked --forked",
-    )
     group.addoption(
         "--testrunuid",
         action="store",
@@ -195,14 +190,6 @@ def pytest_configure(config):
         tr = config.pluginmanager.getplugin("terminalreporter")
         if tr:
             tr.showfspath = False
-    if config.getoption("boxed"):
-        warning = DeprecationWarning(
-            "The --boxed command line argument is deprecated. "
-            "Install pytest-forked and use --forked instead. "
-            "pytest-xdist 3.0.0 will remove the --boxed argument and pytest-forked dependency."
-        )
-        config.issue_config_time_warning(warning, 2)
-        config.option.forked = True
 
     config_line = (
         "xdist_group: specify group for tests should run in same session."

src/xdist/workermanage.py

@@ -6,7 +6,6 @@
 from pathlib import Path
 from typing import List, Union, Sequence, Optional, Any, Tuple, Set
 
-import py
 import pytest
 import execnet
 

testing/acceptance_test.py

@@ -602,11 +602,10 @@ def test_1(request):
 def test_crashing_item(pytester, when) -> None:
     """Ensure crashing item is correctly reported during all testing stages"""
     code = dict(setup="", call="", teardown="")
-    code[when] = "py.process.kill(os.getpid())"
+    code[when] = "os._exit(1)"
     p = pytester.makepyfile(
         """
         import os
-        import py
         import pytest
 
         @pytest.fixture

testing/test_plugin.py

@@ -122,22 +122,6 @@ def pytest_xdist_auto_num_workers():
     assert config.getoption("numprocesses") == 42
 
 
-def test_boxed_with_collect_only(pytester: pytest.Pytester) -> None:
-    from xdist.plugin import pytest_cmdline_main as check_options
-
-    config = pytester.parseconfigure("-n1", "--boxed")
-    check_options(config)
-    assert config.option.forked
-
-    config = pytester.parseconfigure("-n1", "--collect-only")
-    check_options(config)
-    assert not config.option.forked
-
-    config = pytester.parseconfigure("-n1", "--boxed", "--collect-only")
-    check_options(config)
-    assert config.option.forked
-
-
 def test_dsession_with_collect_only(pytester: pytest.Pytester) -> None:
     from xdist.plugin import pytest_cmdline_main as check_options
     from xdist.plugin import pytest_configure as configure