Merge "aconfig: add project scaffolding" am: e7a850e942

Original change: https://android-review.googlesource.com/c/platform/build/+/2563154

Change-Id: I88c6b05de525f296d879805e099f020f7c5e4fb4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

tools/aconfig/Android.bp

@@ -0,0 +1,33 @@
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+rust_protobuf_host {
+    name: "libaconfig_protos",
+    protos: ["protos/aconfig.proto"],
+    crate_name: "aconfig_protos",
+    source_stem: "aconfig_protos",
+    use_protobuf3: true,
+}
+
+rust_defaults {
+    name: "aconfig.defaults",
+    edition: "2021",
+    clippy_lints: "android",
+    lints: "android",
+    srcs: ["src/main.rs"],
+    rustlibs: [
+        "libaconfig_protos",
+        "libprotobuf",
+    ],
+}
+
+rust_binary_host {
+    name: "aconfig",
+    defaults: ["aconfig.defaults"],
+}
+
+rust_test_host {
+    name: "aconfig.test",
+    defaults: ["aconfig.defaults"],
+}

tools/aconfig/OWNERS

@@ -0,0 +1,5 @@
+amhk@google.com
+jham@google.com
+joeo@google.com
+opg@google.com
+zhidou@google.com

tools/aconfig/PREUPLOAD.cfg

@@ -0,0 +1,5 @@
+[Builtin Hooks]
+rustfmt = true
+
+[Builtin Hooks Options]
+rustfmt = --config-path=rustfmt.toml

tools/aconfig/protos/aconfig.proto

@@ -0,0 +1,23 @@
+// Copyright (C) 2023 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
+
+// Placeholder proto file. Will be replaced by actual contents.
+
+syntax = "proto3";
+
+package android.aconfig;
+
+message Placeholder {
+  string name = 1;
+}

tools/aconfig/rustfmt.toml

@@ -0,0 +1 @@
+../../../soong/scripts/rustfmt.toml

tools/aconfig/src/main.rs

@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2023 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.
+ */
+
+//! `aconfig` is a build time tool to manage build time configurations, such as feature flags.
+
+use aconfig_protos::aconfig::Placeholder;
+use protobuf::text_format::{parse_from_str, ParseError};
+
+fn foo() -> Result<String, ParseError> {
+    let placeholder = parse_from_str::<Placeholder>(r#"name: "aconfig""#)?;
+    Ok(placeholder.name)
+}
+
+fn main() {
+    println!("{:?}", foo());
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_foo() {
+        assert_eq!("aconfig", foo().unwrap());
+    }
+
+    #[test]
+    fn test_binary_protobuf() {
+        use protobuf::Message;
+        let mut buffer = Vec::new();
+
+        let mut original = Placeholder::new();
+        original.name = "test".to_owned();
+        original.write_to_writer(&mut buffer).unwrap();
+
+        let copy = Placeholder::parse_from_reader(&mut buffer.as_slice()).unwrap();
+
+        assert_eq!(original, copy);
+    }
+}