add support for WITH_TIDY, ALLOW_LOCAL_TIDY_TRUE

Bug: 257292095
Test: WITH_TIDY=1 b build -s //packages/modules/adb:adb_test
Test: ALLOW_LOCAL_TIDY_TRUE=1 b build -s //packages/modules/adb:adb_test
Change-Id: I7990b53c9d167e50b9eb4a507fae1b4004d106a7

3 files changed, 37 insertions, 1 deletions

diff --git a/flags/BUILD.bazel b/flags/BUILD.bazel
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/flags/BUILD.bazel
diff --git a/flags/cc/tidy/BUILD.bazel b/flags/cc/tidy/BUILD.bazel
index 4bd8966b..e3d40f71 100644
--- a/flags/cc/tidy/BUILD.bazel
+++ b/flags/cc/tidy/BUILD.bazel
@@ -15,11 +15,22 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-load("@bazel_skylib//rules:common_settings.bzl", "string_flag", "string_list_flag")
+load("@bazel_skylib//rules:common_settings.bzl", "bool_flag", "string_flag", "string_list_flag")
 load("@env//:env.bzl", "env")
+load("//build/bazel/flags:common.bzl", "is_env_true")
 
 package(default_visibility = ["//visibility:public"])
 
+bool_flag(
+    name = "with_tidy",
+    build_setting_default = is_env_true(env.get("WITH_TIDY")),
+)
+
+bool_flag(
+    name = "allow_local_tidy_true",
+    build_setting_default = is_env_true(env.get("ALLOW_LOCAL_TIDY_TRUE")),
+)
+
 _with_tidy_flags = env.get("WITH_TIDY_FLAGS", None)
 
 string_list_flag(
diff --git a/flags/common.bzl b/flags/common.bzl
new file mode 100644
index 00000000..270e1f9c
--- /dev/null
+++ b/flags/common.bzl
@@ -0,0 +1,25 @@
+"""
+Copyright (C) 2022 The Android Open Source Project
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+"""
+
+def is_env_true(value):
+    """return the truthiness of the value of an environment variable
+
+    Args:
+        value (str): the environment variable value to test
+    Returns:
+        if the value is truthy
+    """
+    return value != None and value.lower() in ["1", "y", "yes", "on", "true"]