Fix regression with custom arguments being dropped in non-local executions

src/xdist/workermanage.py

@@ -190,6 +190,7 @@ def make_reltoroot(roots, args):
         parts = arg.split(splitcode)
         fspath = py.path.local(parts[0])
         if not fspath.exists():
+            result.append(arg)
             continue
         for root in roots:
             x = fspath.relto(root)

testing/acceptance_test.py

@@ -193,9 +193,12 @@ def test_distribution_rsyncdirs_example(self, testdir):
         subdir.ensure("__init__.py")
         p = subdir.join("test_one.py")
         p.write("def test_5():\n  assert not __file__.startswith(%r)" % str(p))
-        result = testdir.runpytest(
+        result = testdir.runpytest_subprocess(
             "-v",
             "-d",
+            "-s",
+            "--foobar=123",
+            "--dist=load",
             "--rsyncdir=%(subdir)s" % locals(),
             "--tx=popen//chdir=%(dest)s" % locals(),
             p,
@@ -209,6 +212,9 @@ def test_distribution_rsyncdirs_example(self, testdir):
                 "*1 passed*",
             ]
         )
+        result.stderr.fnmatch_lines(
+            ["--foobar=123 active! *", "--foobar=123 active! *"]
+        )
         assert dest.join(subdir.basename).check(dir=1)
 
     def test_backward_compatibility_worker_terminology(self, testdir):

testing/foobar/foobarplugin.py

@@ -0,0 +1,16 @@
+from __future__ import print_function
+
+import os
+import sys
+
+import pytest
+
+
+def pytest_addoption(parser):
+    parser.addoption("--foobar", action="store", dest="foobar_opt")
+
+
+@pytest.mark.tryfirst
+def pytest_load_initial_conftests(early_config):
+    opt = early_config.known_args_namespace.foobar_opt
+    print("--foobar=%s active! [%s]" % (opt, os.getpid()), file=sys.stderr)

testing/foobar/setup.py

@@ -0,0 +1,6 @@
+from setuptools import setup
+
+setup(
+    py_modules=["foobarplugin"],
+    entry_points={"pytest11": ["foobarplugin = foobarplugin"]},
+)

tox.ini

@@ -11,6 +11,7 @@ deps =
   pytestlatest: pytest
   pytestmaster: git+https://github.com/pytest-dev/pytest.git@master
   pytestfeatures: git+https://github.com/pytest-dev/pytest.git@features
+  -etesting/foobar
 commands=
   pytest {posargs}