Merge "printflags: introduce device tool to print feature flags" into main

// host binary: aconfig

rust_protobuf_host {

rust_protobuf {

    name: "libaconfig_protos",

    protos: ["protos/aconfig.proto"],

    crate_name: "aconfig_protos",

    source_stem: "aconfig_protos",

    use_protobuf3: true,

    host_supported: true,

}

rust_defaults {

package {

    default_applicable_licenses: ["Android-Apache-2.0"],

}

rust_binary {

    name: "printflags",

    edition: "2021",

    clippy_lints: "android",

    lints: "android",

    srcs: ["src/main.rs"],

    rustlibs: [

        "libaconfig_protos",

        "libanyhow",

        "libprotobuf",

    ],

}

/*

 * 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.

 */

//! `printflags` is a device binary to print feature flags.

use aconfig_protos::aconfig::Parsed_flags as ProtoParsedFlags;

use anyhow::Result;

use std::collections::HashMap;

use std::fs;

fn main() -> Result<()> {

    let mut flags: HashMap<String, Vec<String>> = HashMap::new();

    for partition in ["system", "system_ext", "product", "vendor"] {

        let path = format!("/{}/etc/aconfig_flags.pb", partition);

        let Ok(bytes) = fs::read(&path) else {

            eprintln!("warning: failed to read {}", path);

            continue;

        };

        let parsed_flags: ProtoParsedFlags = protobuf::Message::parse_from_bytes(&bytes)?;

        for flag in parsed_flags.parsed_flag {

            let key = format!("{}.{}", flag.package(), flag.name());

            let value = format!("{:?} + {:?} ({})", flag.permission(), flag.state(), partition);

            flags.entry(key).or_default().push(value);

        }

    }

    for (key, value) in flags {

        // TODO: if the flag is READ_WRITE (for any partition), call "device_config get" to obtain

        // the flag's current state, and append value to the output

        println!("{}: {}", key, value.join(", "));

    }

    Ok(())

}