loader: Add __opts__ to pack if not already present

changelog/63013.fixed

@@ -0,0 +1,3 @@
+The `__opts__` dunder dictionary is now added to the loader's `pack` if not
+already present, which makes it accessible via the
+`salt.loader.context.NamedLoaderContext` class.

doc/topics/development/modules/developing.rst

@@ -155,6 +155,11 @@ The following dunder dictionaries are always defined, but may be empty
 __opts__
 --------
 
+..versionchanged:: 3006.0
+
+    The ``__opts__`` dictionary can now be accessed via
+    :py:mod:`~salt.loader.context``.
+
 Defined in: All modules
 
 The ``__opts__`` dictionary contains all of the options passed in the

salt/loader/lazy.py

@@ -590,6 +590,10 @@ class LazyLoader(salt.utils.lazy.LazyDict):
             if key == "logger":
                 continue
             mod_opts[key] = val
+
+        if "__opts__" not in self.pack:
+            self.pack["__opts__"] = mod_opts
+
         return mod_opts
 
     def _iter_files(self, mod_name):

tests/pytests/unit/loader/test_context.py

@@ -45,3 +45,12 @@ def test_named_loader_context_deepcopy():
     assert coppied.name == named_context.name
     assert id(coppied.loader_context) == id(named_context.loader_context)
     assert id(coppied.default) != id(named_context.default)
+
+
+def test_named_loader_context_opts():
+    loader_context = salt.loader.context.LoaderContext()
+    opts = loader_context.named_context("__opts__")
+    loader = salt.loader.lazy.LazyLoader(["/foo"], opts={"foo": "bar"})
+    with salt.loader.context.loader_context(loader):
+        assert "foo" in opts
+        assert opts["foo"] == "bar"

tests/pytests/unit/loader/test_lazy.py

@@ -119,3 +119,23 @@ def test_missing_loader_from_salt_internal_loaders():
         salt.loader._module_dirs(
             {"extension_modules": "/tmp/foo"}, "missingmodules", "module"
         )
+
+
+def test_loader_pack_always_has_opts(loader_dir):
+    loader = salt.loader.lazy.LazyLoader([loader_dir], opts={"foo": "bar"})
+    assert "__opts__" in loader.pack
+    assert "foo" in loader.pack["__opts__"]
+    assert loader.pack["__opts__"]["foo"] == "bar"
+
+
+def test_loader_pack_opts_not_overwritten(loader_dir):
+    opts = {"foo": "bar"}
+    loader = salt.loader.lazy.LazyLoader(
+        [loader_dir],
+        opts={"foo": "bar"},
+        pack={"__opts__": {"baz": "bif"}},
+    )
+    assert "__opts__" in loader.pack
+    assert "foo" not in loader.pack["__opts__"]
+    assert "baz" in loader.pack["__opts__"]
+    assert loader.pack["__opts__"]["baz"] == "bif"