[PATCH 12/15] scripts/qom-fuse: add static type hints

[John Snow <jsnow@redhat.com>]

Because fusepy does not have type hints, add some targeted warning
suppressions.

NOTE: Prior to this change, running 'mypy qemu' from the python
directory worked OK, but only coincidentally. Going forward, you will
need to run 'mypy -p qemu' instead. These invocation forms will be
codified in a CI test soon.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 python/setup.cfg     |  8 ++++++++
 scripts/qmp/qom-fuse | 26 +++++++++++++++++---------
 2 files changed, 25 insertions(+), 9 deletions(-)

diff --git a/python/setup.cfg b/python/setup.cfg
index 58cf48aaed..9592ac91df 100755
--- a/python/setup.cfg
+++ b/python/setup.cfg
@@ -35,6 +35,14 @@ python_version = 3.6
 warn_unused_configs = True
 namespace_packages = True
 
+[mypy-qemu.qmp.qom_fuse]
+# fusepy has no type stubs:
+allow_subclassing_any = True
+
+[mypy-fuse]
+# fusepy has no type stubs:
+ignore_missing_imports = True
+
 [pylint.messages control]
 # Disable the message, report, category or checker with the given id(s). You
 # can either give multiple identifiers separated by comma (,) or put this
diff --git a/scripts/qmp/qom-fuse b/scripts/qmp/qom-fuse
index b120b93391..22be366349 100755
--- a/scripts/qmp/qom-fuse
+++ b/scripts/qmp/qom-fuse
@@ -39,7 +39,14 @@ from errno import ENOENT, EPERM
 import os
 import stat
 import sys
-from typing import Dict
+from typing import (
+    IO,
+    Dict,
+    Iterator,
+    Mapping,
+    Optional,
+    Union,
+)
 
 import fuse
 from fuse import FUSE, FuseOSError, Operations
@@ -84,7 +91,7 @@ class QOMFuse(QOMCommand, Operations):
         self.fuse = FUSE(self, self.mount, foreground=True)
         return 0
 
-    def get_ino(self, path):
+    def get_ino(self, path: str) -> int:
         """Get an inode number for a given QOM path."""
         if path in self.ino_map:
             return self.ino_map[path]
@@ -92,7 +99,7 @@ class QOMFuse(QOMCommand, Operations):
         self.ino_count += 1
         return self.ino_map[path]
 
-    def is_object(self, path):
+    def is_object(self, path: str) -> bool:
         """Is the given QOM path an object?"""
         try:
             self.qom_list(path)
@@ -100,7 +107,7 @@ class QOMFuse(QOMCommand, Operations):
         except QMPResponseError:
             return False
 
-    def is_property(self, path):
+    def is_property(self, path: str) -> bool:
         """Is the given QOM path a property?"""
         path, prop = path.rsplit('/', 1)
         if path == '':
@@ -113,7 +120,7 @@ class QOMFuse(QOMCommand, Operations):
         except QMPResponseError:
             return False
 
-    def is_link(self, path):
+    def is_link(self, path: str) -> bool:
         """Is the given QOM path a link?"""
         path, prop = path.rsplit('/', 1)
         if path == '':
@@ -126,7 +133,7 @@ class QOMFuse(QOMCommand, Operations):
         except QMPResponseError:
             return False
 
-    def read(self, path, size, offset, fh):
+    def read(self, path: str, size: int, offset: int, fh: IO[bytes]) -> bytes:
         if not self.is_property(path):
             raise FuseOSError(ENOENT)
 
@@ -144,7 +151,7 @@ class QOMFuse(QOMCommand, Operations):
 
         return bytes(data[offset:][:size], encoding='utf-8')
 
-    def readlink(self, path):
+    def readlink(self, path: str) -> Union[bool, str]:
         if not self.is_link(path):
             return False
         path, prop = path.rsplit('/', 1)
@@ -152,7 +159,8 @@ class QOMFuse(QOMCommand, Operations):
         return prefix + str(self.qmp.command('qom-get', path=path,
                                              property=prop))
 
-    def getattr(self, path, fh=None):
+    def getattr(self, path: str,
+                fh: Optional[IO[bytes]] = None) -> Mapping[str, object]:
         if self.is_link(path):
             value = {
                 'st_mode': 0o755 | stat.S_IFLNK,
@@ -196,7 +204,7 @@ class QOMFuse(QOMCommand, Operations):
             raise FuseOSError(ENOENT)
         return value
 
-    def readdir(self, path, fh):
+    def readdir(self, path: str, fh: IO[bytes]) -> Iterator[str]:
         yield '.'
         yield '..'
         for item in self.qom_list(path):
-- 
2.26.2