Disable projfs_enumeration integration test if ntapi missing

Summary:
fbcode_builder doesn't currently know how to build a Python extension module,
which means the Windows oss build fails on trying to load ntapi if we don't
pass the `--no-tests` flag to getdeps.  Ideally we add extension module support
to the builder, but for now let's just disable the test case if the extension
module is unavailable.

Reviewed By: chadaustin

Differential Revision: D44804035

fbshipit-source-id: 10da54f6ea7d3699ac42421ee5cf57d883509bdd

eden/integration/lib/skip.py

@@ -286,6 +286,26 @@ if sys.platform != "win32":
         }
     )
 
+def _have_ntapi_extension_module() -> bool:
+    if sys.platform != "win32":
+        return False
+
+    try:
+        from eden.integration.lib.ntapi import get_directory_entry_size  # @nolint
+        return True
+    except ImportError:
+        return False
+
+# ProjFS enumeration tests depend on a Python extension module, which may not be
+# available with all build systems.
+if not _have_ntapi_extension_module():
+    TEST_DISABLED.update(
+        {
+            "projfs_enumeration.ProjFSEnumeration": True,
+            "projfs_enumeration.ProjFSEnumerationInsufficientBuffer": True,
+        }
+    )
+
 # We only run tests on linux currently, so we only need to disable them there.
 if sys.platform.startswith("linux"):
     # tests to skip on nfs, this list allows us to avoid writing the nfs postfix

eden/integration/projfs_enumeration.py

@@ -10,11 +10,17 @@ from pathlib import Path
 from .lib import testcase
 
 if sys.platform == "win32":
-    from .lib.ntapi import (
-        get_directory_entry_size,
-        open_directory_handle,
-        query_directory_file_ex,
-    )
+    try:
+        from .lib.ntapi import (
+            get_directory_entry_size,
+            open_directory_handle,
+            query_directory_file_ex,
+        )
+    except ImportError:
+        # TODO(T150221518): We should add the ntapi extension module to the
+        # getdeps build, but for now we have to account for the possibility that
+        # it may not be present.
+        pass
 
 
 SL_RESTART_SCAN = 0x00000001