Silence errors from third party packages in daemon (#13768)

If daemon was running and additional third party code was installed,
mypy daemon would report errors from the code. This was inconsistent 
with non-daemon mypy and the initial daemon run. If mypy was run with 
strict options, this could results lots of errors being generated.

The same code is used to silence errors from typeshed. I'm using
typeshed in the test case since it was easier to do.

I also manually verified that this works with pytest, aiohttp and some
typeshed stub packages.

Fixes #13140.

Author: JukkaL

mypy/build.py

@@ -1940,6 +1940,8 @@ def __init__(
                 raise
             if follow_imports == "silent":
                 self.ignore_all = True
+        elif path and is_silent_import_module(manager, path):
+            self.ignore_all = True
         self.path = path
         if path:
             self.abspath = os.path.abspath(path)
@@ -2613,11 +2615,8 @@ def find_module_and_diagnose(
                 else:
                     skipping_module(manager, caller_line, caller_state, id, result)
             raise ModuleNotFound
-        if not manager.options.no_silence_site_packages:
-            for dir in manager.search_paths.package_path + manager.search_paths.typeshed_path:
-                if is_sub_path(result, dir):
-                    # Silence errors in site-package dirs and typeshed
-                    follow_imports = "silent"
+        if is_silent_import_module(manager, result):
+            follow_imports = "silent"
         return (result, follow_imports)
     else:
         # Could not find a module.  Typically the reason is a
@@ -3560,3 +3559,12 @@ def record_missing_stub_packages(cache_dir: str, missing_stub_packages: set[str]
     else:
         if os.path.isfile(fnam):
             os.remove(fnam)
+
+
+def is_silent_import_module(manager: BuildManager, path: str) -> bool:
+    if not manager.options.no_silence_site_packages:
+        for dir in manager.search_paths.package_path + manager.search_paths.typeshed_path:
+            if is_sub_path(path, dir):
+                # Silence errors in site-package dirs and typeshed
+                return True
+    return False

mypy/server/update.py

@@ -963,9 +963,10 @@ def key(node: FineGrainedDeferredNode) -> int:
 
     nodes = sorted(nodeset, key=key)
 
-    options = graph[module_id].options
+    state = graph[module_id]
+    options = state.options
     manager.errors.set_file_ignored_lines(
-        file_node.path, file_node.ignored_lines, options.ignore_errors
+        file_node.path, file_node.ignored_lines, options.ignore_errors or state.ignore_all
     )
 
     targets = set()

test-data/unit/fine-grained-modules.test

@@ -2206,3 +2206,41 @@ a.py:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missin
 a.py:1: error: Library stubs not installed for "jack"
 a.py:1: note: Hint: "python3 -m pip install types-JACK-Client"
 a.py:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
+
+[case testIgnoreErrorsFromTypeshed]
+# flags: --custom-typeshed-dir tmp/ts --follow-imports=normal
+# cmd1: mypy a.py
+# cmd2: mypy a.py
+
+[file a.py]
+import foobar
+
+[file ts/stdlib/abc.pyi]
+[file ts/stdlib/builtins.pyi]
+class object: pass
+class str: pass
+class ellipsis: pass
+[file ts/stdlib/sys.pyi]
+[file ts/stdlib/types.pyi]
+[file ts/stdlib/typing.pyi]
+def cast(x): ...
+[file ts/stdlib/typing_extensions.pyi]
+[file ts/stdlib/VERSIONS]
+[file ts/stubs/mypy_extensions/mypy_extensions.pyi]
+
+[file ts/stdlib/foobar.pyi.2]
+# We report no errors from typeshed. It would be better to test ignoring
+# errors from PEP 561 packages, but it's harder to test and uses the
+# same code paths, so we are using typeshed instead.
+import baz
+import zar
+undefined
+
+[file ts/stdlib/baz.pyi.2]
+import whatever
+undefined
+
+[out]
+a.py:1: error: Cannot find implementation or library stub for module named "foobar"
+a.py:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
+==