[PULL 09/13] iotests: add 'qemu' package location to PYTHONPATH in testenv

[Kevin Wolf <kwolf@redhat.com>]

From: John Snow <jsnow@redhat.com>

We can drop the sys.path hacking in various places by doing
this. Additionally, by doing it in one place right up top, we can print
interesting warnings in case the environment does not look correct. (See
next commit.)

If we ever decide to change how the environment is crafted, all of the
"help me find my python packages" goop is all in one place, right in one
function.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20210923180715.4168522-2-jsnow@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 tests/qemu-iotests/iotests.py             |  2 --
 tests/qemu-iotests/testenv.py             | 15 +++++++++------
 tests/qemu-iotests/235                    |  2 --
 tests/qemu-iotests/297                    |  6 ------
 tests/qemu-iotests/300                    |  5 ++---
 tests/qemu-iotests/tests/mirror-top-perms |  7 +++----
 6 files changed, 14 insertions(+), 23 deletions(-)

diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index ce06cf5630..b06ad76e0c 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -36,8 +36,6 @@
 
 from contextlib import contextmanager
 
-# pylint: disable=import-error, wrong-import-position
-sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'python'))
 from qemu.machine import qtest
 from qemu.qmp import QMPMessage
 
diff --git a/tests/qemu-iotests/testenv.py b/tests/qemu-iotests/testenv.py
index 70da0d60c8..99a57a69f3 100644
--- a/tests/qemu-iotests/testenv.py
+++ b/tests/qemu-iotests/testenv.py
@@ -108,12 +108,15 @@ def init_directories(self) -> None:
              SAMPLE_IMG_DIR
              OUTPUT_DIR
         """
-        self.pythonpath = os.getenv('PYTHONPATH')
-        if self.pythonpath:
-            self.pythonpath = self.source_iotests + os.pathsep + \
-                self.pythonpath
-        else:
-            self.pythonpath = self.source_iotests
+
+        # Path where qemu goodies live in this source tree.
+        qemu_srctree_path = Path(__file__, '../../../python').resolve()
+
+        self.pythonpath = os.pathsep.join(filter(None, (
+            self.source_iotests,
+            str(qemu_srctree_path),
+            os.getenv('PYTHONPATH'),
+        )))
 
         self.test_dir = os.getenv('TEST_DIR',
                                   os.path.join(os.getcwd(), 'scratch'))
diff --git a/tests/qemu-iotests/235 b/tests/qemu-iotests/235
index 8aed45f9a7..4de920c380 100755
--- a/tests/qemu-iotests/235
+++ b/tests/qemu-iotests/235
@@ -24,8 +24,6 @@ import os
 import iotests
 from iotests import qemu_img_create, qemu_io, file_path, log
 
-sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'python'))
-
 from qemu.machine import QEMUMachine
 
 iotests.script_initialize(supported_fmts=['qcow2'])
diff --git a/tests/qemu-iotests/297 b/tests/qemu-iotests/297
index b04cba5366..467b712280 100755
--- a/tests/qemu-iotests/297
+++ b/tests/qemu-iotests/297
@@ -68,12 +68,6 @@ def run_linters():
     # Todo notes are fine, but fixme's or xxx's should probably just be
     # fixed (in tests, at least)
     env = os.environ.copy()
-    qemu_module_path = os.path.join(os.path.dirname(__file__),
-                                    '..', '..', 'python')
-    try:
-        env['PYTHONPATH'] += os.pathsep + qemu_module_path
-    except KeyError:
-        env['PYTHONPATH'] = qemu_module_path
     subprocess.run(('pylint-3', '--score=n', '--notes=FIXME,XXX', *files),
                    env=env, check=False)
 
diff --git a/tests/qemu-iotests/300 b/tests/qemu-iotests/300
index fe94de84ed..10f9f2a8da 100755
--- a/tests/qemu-iotests/300
+++ b/tests/qemu-iotests/300
@@ -24,11 +24,10 @@ import random
 import re
 from typing import Dict, List, Optional
 
+from qemu.machine import machine
+
 import iotests
 
-# Import qemu after iotests.py has amended sys.path
-# pylint: disable=wrong-import-order
-from qemu.machine import machine
 
 BlockBitmapMapping = List[Dict[str, object]]
 
diff --git a/tests/qemu-iotests/tests/mirror-top-perms b/tests/qemu-iotests/tests/mirror-top-perms
index 2fc8dd66e0..73138a0ef9 100755
--- a/tests/qemu-iotests/tests/mirror-top-perms
+++ b/tests/qemu-iotests/tests/mirror-top-perms
@@ -20,13 +20,12 @@
 #
 
 import os
-import iotests
-from iotests import qemu_img
 
-# Import qemu after iotests.py has amended sys.path
-# pylint: disable=wrong-import-order
 import qemu
 
+import iotests
+from iotests import qemu_img
+
 
 image_size = 1 * 1024 * 1024
 source = os.path.join(iotests.test_dir, 'source.img')
-- 
2.31.1