fix: creates linting-typing.cfg in presubmit (#1881)

* creates linting-typing.cfg in presubmit

* attempt to filter out linting and typing tests from presubmit

* lints and blackens this commit

* revise environmental variables

* Update noxfile.py

* Update noxfile.py

* Update noxfile.py

* Update noxfile.py

* Update noxfile.py

* Update noxfile.py

* Update .kokoro/presubmit/linting-typing.cfg

* Update .kokoro/presubmit/linting-typing.cfg

* Update .kokoro/presubmit/linting-typing.cfg

* Update .kokoro/presubmit/presubmit.cfg

* Update .kokoro/presubmit/presubmit.cfg

.kokoro/presubmit/linting-typing.cfg

@@ -0,0 +1,7 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Only run these nox sessions.
+env_vars: {
+    key: "NOX_SESSION"
+    value: "lint lint_setup_py blacken mypy mypy_samples pytype"
+}

.kokoro/presubmit/presubmit.cfg

@@ -9,3 +9,7 @@ env_vars: {
     key: "RUN_SNIPPETS_TESTS"
     value: "false"
 }
+env_vars: {
+    key: "RUN_LINTING_TYPING_TESTS"
+    value: "false"
+}

noxfile.py

@@ -132,6 +132,10 @@ def unit_noextras(session):
 def mypy(session):
     """Run type checks with mypy."""
 
+    # Check the value of `RUN_LINTING_TYPING_TESTS` env var. It defaults to true.
+    if os.environ.get("RUN_LINTING_TYPING_TESTS", "true") == "false":
+        session.skip("RUN_LINTING_TYPING_TESTS is set to false, skipping")
+
     session.install("-e", ".[all]")
     session.install(MYPY_VERSION)
 
@@ -153,6 +157,10 @@ def pytype(session):
     # recent version avoids the error until a possibly better fix is found.
     # https://github.com/googleapis/python-bigquery/issues/655
 
+    # Check the value of `RUN_LINTING_TYPING_TESTS` env var. It defaults to true.
+    if os.environ.get("RUN_LINTING_TYPING_TESTS", "true") == "false":
+        session.skip("RUN_LINTING_TYPING_TESTS is set to false, skipping")
+
     session.install("attrs==20.3.0")
     session.install("-e", ".[all]")
     session.install(PYTYPE_VERSION)
@@ -213,6 +221,10 @@ def system(session):
 def mypy_samples(session):
     """Run type checks with mypy."""
 
+    # Check the value of `RUN_LINTING_TYPING_TESTS` env var. It defaults to true.
+    if os.environ.get("RUN_LINTING_TYPING_TESTS", "true") == "false":
+        session.skip("RUN_LINTING_TYPING_TESTS is set to false, skipping")
+
     session.install("pytest")
     for requirements_path in CURRENT_DIRECTORY.glob("samples/*/requirements.txt"):
         session.install("-r", str(requirements_path))
@@ -394,6 +406,10 @@ def lint(session):
     serious code quality issues.
     """
 
+    # Check the value of `RUN_LINTING_TYPING_TESTS` env var. It defaults to true.
+    if os.environ.get("RUN_LINTING_TYPING_TESTS", "true") == "false":
+        session.skip("RUN_LINTING_TYPING_TESTS is set to false, skipping")
+
     session.install("flake8", BLACK_VERSION)
     session.install("-e", ".")
     session.run("flake8", os.path.join("google", "cloud", "bigquery"))
@@ -408,6 +424,10 @@ def lint(session):
 def lint_setup_py(session):
     """Verify that setup.py is valid (including RST check)."""
 
+    # Check the value of `RUN_LINTING_TYPING_TESTS` env var. It defaults to true.
+    if os.environ.get("RUN_LINTING_TYPING_TESTS", "true") == "false":
+        session.skip("RUN_LINTING_TYPING_TESTS is set to false, skipping")
+
     session.install("docutils", "Pygments")
     session.run("python", "setup.py", "check", "--restructuredtext", "--strict")
 
@@ -418,6 +438,10 @@ def blacken(session):
     Format code to uniform standard.
     """
 
+    # Check the value of `RUN_LINTING_TYPING_TESTS` env var. It defaults to true.
+    if os.environ.get("RUN_LINTING_TYPING_TESTS", "true") == "false":
+        session.skip("RUN_LINTING_TYPING_TESTS is set to false, skipping")
+
     session.install(BLACK_VERSION)
     session.run("black", *BLACK_PATHS)