various fixes related to sub-process handling

azure-pipelines.yml

@@ -5,7 +5,7 @@ variables:
   CI_NAME: Azure Pipelines
   CI_BUILD_ID: $(Build.BuildId)
   CI_BUILD_URL: "https://toxdev.visualstudio.com/tox/_build/results?buildId=$(Build.BuildId)"
-  PYTEST_ADDOPTS: "-vv -ra --showlocals"
+  PYTEST_ADDOPTS: "-v -v -ra --showlocals"
   GIT_BRANCH: $[ coalesce(variables['System.PullRequest.SourceBranch'], variables['Build.SourceBranchName'], 'not-found') ]
   GIT_COMMIT_SHA: $[ coalesce(variables['System.PullRequest.SourceCommitId'], variables['Build.SourceVersion'], 'not-found') ]
 

docs/changelog/1137.bugfix.rst

@@ -0,0 +1 @@
+Fixed bug of children process calls logs clashing (log already exists) - by :user:`gaborbernat`

docs/changelog/1139.feature.rst

@@ -1 +1,2 @@
-tox will inject the ``TOX_PARALLEL_ENV`` environment variable, set to the current running tox environment name, only when running in parallel mode.
+tox will inject the ``TOX_PARALLEL_ENV`` environment variable, set to the current running tox environment name,
+only when running in parallel mode. - by :user:`gaborbernat`

docs/changelog/1143.feature.rst

@@ -0,0 +1 @@
+Parallel children now save their output to a disk logfile  - by :user:`gaborbernat`

docs/changelog/1150.bugfix.rst

@@ -0,0 +1,2 @@
+Interpreter discovery and virtualenv creation process calls that failed will now print out on the screen their output
+(via the logfile we automatically save) - by :user:`gaborbernat`

docs/changelog/1159.feature.rst

@@ -0,0 +1 @@
+Parallel children now are added to ``--result-json``  - by :user:`gaborbernat`

docs/changelog/1163.doc.rst

@@ -1 +1 @@
-Add a ``poetry`` examples to packaging.
+Add a ``poetry`` examples to packaging - by :user:`gaborbernat`

docs/changelog/1172.bugfix.rst

@@ -0,0 +1,3 @@
+Interrupting a tox call (e.g. via CTRL+C) now will ensure that spawn child processes (test calls, interpreter discovery,
+parallel sub-instances, provisioned hosts) are correctly stopped before exiting (via the pattern of INTERRUPT - 300 ms,
+TERMINATE - 200 ms, KILL signals)  - by :user:`gaborbernat`

docs/changelog/1203.feature.rst

@@ -0,0 +1,2 @@
+Setting the environment variable ``TOX_REPORTER_TIMESTAMP`` to ``1`` will enable showing for each output line its delta
+since the tox startup. This can be especially handy when debugging parallel runs.- by :user:`gaborbernat`

docs/changelog/998.feature.rst

@@ -1,2 +1,2 @@
 tox now auto-provisions itself if needed (see :ref:`auto-provision`). Plugins or minimum version of tox no longer
-need to be manually satisfied by the user, increasing their ease of use.
+need to be manually satisfied by the user, increasing their ease of use. - by :user:`gaborbernat`

setup.cfg

@@ -63,6 +63,7 @@ testing =
     pytest-timeout >= 1.3.0, <2
     pytest-xdist >= 1.22.2, <2
     pytest-randomly >= 1.2.3, <2
+    psutil >= 5.6.1, < 6; python_version != "3.4"
 docs =
     sphinx >= 1.8.0, < 2
     towncrier >= 18.5.0

src/tox/_pytestplugin.py

@@ -15,6 +15,7 @@
 import tox
 from tox import venv
 from tox.config import parseconfig
+from tox.config.parallel import ENV_VAR_KEY as PARALLEL_ENV_VAR_KEY
 from tox.reporter import update_default_reporter
 from tox.session import Session, main, setup_reporter
 from tox.venv import CreationConfig, VirtualEnv, getdigest
@@ -58,6 +59,40 @@ def check_cwd_not_changed_by_test():
         pytest.fail("test changed cwd: {!r} => {!r}".format(old, new))
 
 
+@pytest.fixture(autouse=True)
+def check_os_environ_stable():
+    old = os.environ.copy()
+
+    to_clean = {
+        k: os.environ.pop(k, None)
+        for k in {PARALLEL_ENV_VAR_KEY, str("TOX_WORK_DIR"), str("PYTHONPATH")}
+    }
+
+    yield
+
+    for key, value in to_clean.items():
+        if value is not None:
+            os.environ[key] = value
+
+    new = os.environ
+    extra = {k: new[k] for k in set(new) - set(old)}
+    miss = {k: old[k] for k in set(old) - set(new)}
+    diff = {
+        "{} = {} vs {}".format(k, old[k], new[k])
+        for k in set(old) & set(new)
+        if old[k] != new[k] and not k.startswith("PYTEST_")
+    }
+    if extra or miss or diff:
+        msg = "test changed environ"
+        if extra:
+            msg += " extra {}".format(extra)
+        if miss:
+            msg += " miss {}".format(miss)
+        if diff:
+            msg += " diff {}".format(diff)
+        pytest.fail(msg)
+
+
 @pytest.fixture(name="newconfig")
 def create_new_config_file(tmpdir):
     def create_new_config_file_(args, source=None, plugins=()):
@@ -102,6 +137,11 @@ def run_command(self):
                 result.ret = exception.code
             except OSError as e:
                 result.ret = e.errno
+            except tox.exception.InvocationError as exception:
+                result.ret = exception.exit_code
+                if exception.out is not None:
+                    with open(exception.out, "rt") as file_handler:
+                        tox.reporter.verbosity0(file_handler.read())
         return result
 
     yield run
@@ -131,13 +171,30 @@ def _read(self, out, pos):
 
     @property
     def outlines(self):
-        return self.out.splitlines()
+        out = [] if self.out is None else self.out.splitlines()
+        err = [] if self.err is None else self.err.splitlines()
+        return err + out
 
     def __repr__(self):
         return "RunResult(ret={}, args={}, out=\n{}\n, err=\n{})".format(
             self.ret, " ".join(str(i) for i in self.args), self.out, self.err
         )
 
+    def output(self):
+        return "{}\n{}\n{}".format(self.ret, self.err, self.out)
+
+    def assert_success(self, is_run_test_env=True):
+        msg = self.output()
+        assert self.ret == 0, msg
+        if is_run_test_env:
+            assert any("  congratulations :)" == l for l in reversed(self.outlines)), msg
+
+    def assert_fail(self, is_run_test_env=True):
+        msg = self.output()
+        assert self.ret, msg
+        if is_run_test_env:
+            assert not any("  congratulations :)" == l for l in reversed(self.outlines)), msg
+
 
 class ReportExpectMock:
     def __init__(self):
@@ -207,6 +264,8 @@ def __init__(self, args, cwd, env, stdout, stderr, shell):
         self.stdout = stdout
         self.stderr = stderr
         self.shell = shell
+        self.pid = os.getpid()
+        self.returncode = 0
 
     @staticmethod
     def communicate():