printflags: introduce device tool to print feature flags
Metadata about all feature flags used on device are located in
/<partition>/etc/aconfig_flags.pb. Add a new tool, printflags, to read
and pretty-print these files.
printflags is only intended for debugging purposes.
Bug: 301547297
Test: adb shell printflags
Change-Id: I0a3277fecfc8a60eea0aa6bf362a25a311360b71
diff --git a/tools/aconfig/Android.bp b/tools/aconfig/Android.bp
index 28bf8a5..02fc57c 100644
--- a/tools/aconfig/Android.bp
+++ b/tools/aconfig/Android.bp
@@ -34,12 +34,13 @@
// 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 {
@@ -192,4 +193,4 @@
rustlibs: [
"libaconfig_test_rust_library_with_test_mode",
],
-}
\ No newline at end of file
+}
diff --git a/tools/aconfig/printflags/Android.bp b/tools/aconfig/printflags/Android.bp
new file mode 100644
index 0000000..5d73d96
--- /dev/null
+++ b/tools/aconfig/printflags/Android.bp
@@ -0,0 +1,16 @@
+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",
+ ],
+}
diff --git a/tools/aconfig/printflags/src/main.rs b/tools/aconfig/printflags/src/main.rs
new file mode 100644
index 0000000..a9f7c03
--- /dev/null
+++ b/tools/aconfig/printflags/src/main.rs
@@ -0,0 +1,45 @@
+/*
+ * 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(())
+}