enable pywin32 for Python3.10, make it an optional dependency (#6841)

dvc/daemon.py

@@ -48,17 +48,17 @@ def _spawn_posix(cmd, env):
     # with PyInstaller has trouble with SystemExit exception and throws
     # errors such as "[26338] Failed to execute script __main__"
     try:
-        pid = os.fork()
+        pid = os.fork()  # pylint: disable=no-member
         if pid > 0:
             return
     except OSError:
         logger.exception("failed at first fork")
         os._exit(1)  # pylint: disable=protected-access
 
-    os.setsid()
+    os.setsid()  # pylint: disable=no-member
 
     try:
-        pid = os.fork()
+        pid = os.fork()  # pylint: disable=no-member
         if pid > 0:
             os._exit(0)  # pylint: disable=protected-access
     except OSError:

dvc/system.py

@@ -60,7 +60,7 @@ class System:
 
     @staticmethod
     def _reflink_linux(src, dst):
-        import fcntl
+        import fcntl  # pylint: disable=import-error
 
         FICLONE = 0x40049409
 

pyproject.toml

@@ -69,7 +69,7 @@ disable = [
 enable = ["c-extension-no-member", "no-else-return"]
 
 [tool.pylint.typecheck]
-generated-members = ["pytest.lazy_fixture", "logging.TRACE", "logger.trace", "sys.getwindowsversion"]
+generated-members = ["pytest.lazy_fixture", "logging.TRACE", "logger.trace", "sys.getwindowsversion", "argparse.Namespace"]
 ignored-classes = ["Dvcfile"]
 ignored-modules = ["azure"]
 signature-mutators = ["funcy.decorators.decorator"]

setup.cfg

@@ -134,7 +134,6 @@ tests =
     google-compute-engine==2.8.13
     google-cloud-storage==1.42.3
     dvclive==0.4.1
-    pywin32>=225; sys_platform == 'win32' and python_version < '3.10'
     hdfs==2.6.0
     # required by collective.checkdocs
     Pygments==2.10.0
@@ -153,6 +152,8 @@ tests =
     types-requests==2.25.11
     types-tabulate==0.8.3
     types-toml==0.10.1
+    # optional dependencies
+    pywin32>=225; sys_platform == 'win32'
 
 [options.packages.find]
 exclude =

tests/__init__.py

@@ -5,9 +5,12 @@ import sys
 if os.name == "nt":
     import subprocess
 
-    import win32file  # pylint: disable=import-error
-
-    win32file._setmaxstdio(4096)
+    try:
+        import win32file  # pylint: disable=import-error
+    except ImportError:
+        pass
+    else:
+        win32file._setmaxstdio(4096)
 
     # Workaround for two bugs:
     #
@@ -34,7 +37,7 @@ if os.name == "nt":
         subprocess._cleanup = noop
         subprocess._active = None
 else:
-    import resource
+    import resource  # pylint: disable=import-error
 
     resource.setrlimit(resource.RLIMIT_NOFILE, (4096, 4096))
 

tests/func/test_add.py

@@ -677,8 +677,12 @@ def temporary_windows_drive(tmp_path_factory):
     import string
     from ctypes import windll
 
-    import win32api  # pylint: disable=import-error
-    from win32con import DDD_REMOVE_DEFINITION  # pylint: disable=import-error
+    try:
+        # pylint: disable=import-error
+        import win32api
+        from win32con import DDD_REMOVE_DEFINITION
+    except ImportError:
+        pytest.skip("pywin32 not installed")
 
     drives = [
         s[0].upper()
@@ -999,7 +1003,7 @@ def test_add_preserve_meta(tmp_dir, dvc):
 # are the same 260 chars, which makes the test unnecessarily complex
 @pytest.mark.skipif(os.name == "nt", reason="unsupported on Windows")
 def test_add_long_fname(tmp_dir, dvc):
-    name_max = os.pathconf(tmp_dir, "PC_NAME_MAX")
+    name_max = os.pathconf(tmp_dir, "PC_NAME_MAX")  # pylint: disable=no-member
     name = "a" * name_max
     tmp_dir.gen({"data": {name: "foo"}})