address #8361 - introduce hook caller wrappers that enable backward compat

src/_pytest/config/__init__.py

@@ -917,8 +917,10 @@ class Config:
         :type: PytestPluginManager
         """
 
+        from .compat import PathAwareHookProxy
+
         self.trace = self.pluginmanager.trace.root.get("config")
-        self.hook = self.pluginmanager.hook
+        self.hook = PathAwareHookProxy(self.pluginmanager.hook)
         self._inicache: Dict[str, Any] = {}
         self._override_ini: Sequence[str] = ()
         self._opt2dest: Dict[str, str] = {}

src/_pytest/config/compat.py

@@ -0,0 +1,41 @@
+from typing import TYPE_CHECKING
+
+from _pytest.nodes import _imply_path
+
+if TYPE_CHECKING:
+    from ..compat import LEGACY_PATH
+
+
+import functools
+
+# hookname: (Path, LEGACY_PATH)
+imply_paths_hooks = {
+    "pytest_ignore_collect": ("fspath", "path"),
+    "pytest_collect_file": ("fspath", "path"),
+    "pytest_pycollect_makemodule": ("fspath", "path"),
+    "pytest_report_header": ("startpath", "startdir"),
+    "pytest_report_collectionfinish": ("startpath", "startdir"),
+}
+
+
+class PathAwareHookProxy:
+    def __init__(self, hook_caller):
+        self.__hook_caller = hook_caller
+
+    def __getattr__(self, key):
+        if key not in imply_paths_hooks:
+            return getattr(self.__hook_caller, key)
+        else:
+            hook = getattr(self.__hook_caller, key)
+            path_var, fspath_var = imply_paths_hooks[key]
+
+            @functools.wraps(hook)
+            def fixed_hook(**kw):
+                path_value = kw.pop(path_var, None)
+                fspath_value: "LEGACY_PATH" = kw.pop(fspath_var, None)
+                path_value, fspath_value = _imply_path(path_value, fspath_value)
+                kw[path_var] = path_value
+                kw[fspath_var] = fspath_value
+                return hook(**kw)
+
+            return fixed_hook

src/_pytest/main.py

@@ -551,7 +551,9 @@ class Session(nodes.FSCollector):
         remove_mods = pm._conftest_plugins.difference(my_conftestmodules)
         if remove_mods:
             # One or more conftests are not in use at this fspath.
-            proxy = FSHookProxy(pm, remove_mods)
+            from .config.compat import PathAwareHookProxy
+
+            proxy = PathAwareHookProxy(FSHookProxy(pm, remove_mods))
         else:
             # All plugins are active for this fspath.
             proxy = self.config.hook