Add mypy

Now that we have typing in-tree.

Change-Id: I58d782041fda54fd7b7089abba93f2bdae79493f
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>

.pre-commit-config.yaml

@@ -24,3 +24,16 @@ repos:
       - id: ruff-check
         args: ['--fix', '--unsafe-fixes']
       - id: ruff-format
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: v1.17.1
+    hooks:
+      - id: mypy
+        additional_dependencies: [
+          'dogpile.cache',
+        ]
+        # keep this in-sync with '[tool.mypy] exclude' in 'pyproject.toml'
+        exclude: |
+          (?x)(
+            doc/.*
+            | releasenotes/.*
+          )

pyproject.toml

@@ -69,3 +69,40 @@ ignore = [
 
 [tool.ruff.lint.per-file-ignores]
 "oslo_cache/tests/*" = ["S"]
+
+[tool.mypy]
+python_version = "3.10"
+show_column_numbers = true
+show_error_context = true
+ignore_missing_imports = true
+follow_imports = "normal"
+check_untyped_defs = true
+warn_unused_ignores = false
+warn_return_any = true
+warn_unused_configs = true
+warn_redundant_casts = true
+strict_equality = true
+disallow_untyped_decorators = true
+disallow_any_generics = true
+disallow_subclassing_any = true
+disallow_untyped_calls = true
+disallow_incomplete_defs = true
+disallow_untyped_defs = true
+no_implicit_reexport = true
+extra_checks = true
+# keep this in-sync with 'mypy.exclude' in '.pre-commit-config.yaml'
+exclude = '''
+(?x)(
+    doc
+    | releasenotes
+  )
+'''
+
+[[tool.mypy.overrides]]
+module = ["oslo_cache.tests.*"]
+warn_return_any = false
+disallow_untyped_decorators = false
+disallow_any_generics = false
+disallow_subclassing_any = false
+disallow_untyped_calls = false
+disallow_untyped_defs = false