microdroid_manager: initial impl
It is started by init in microdroid and executes a command specified in
a VM payload config.
Bug: 189301496
Test: MicrodroidHostTestCases
(in a microdroid, run /system/bin/microdroid_manager manulally)
Change-Id: I85c7e370d4a0dcf58b4aafbe6e9fba73e69c2a44
diff --git a/microdroid/Android.bp b/microdroid/Android.bp
index 85b5e0c..30fec88 100644
--- a/microdroid/Android.bp
+++ b/microdroid/Android.bp
@@ -48,6 +48,7 @@
"microdroid_build_prop",
"microdroid_init_rc",
"microdroid_launcher",
+ "microdroid_manager",
"ueventd.rc",
"libbinder",
"libbinder_ndk",
diff --git a/microdroid/init.rc b/microdroid/init.rc
index 121afaa..8458291 100644
--- a/microdroid/init.rc
+++ b/microdroid/init.rc
@@ -110,6 +110,9 @@
perform_apex_config
+ # TODO(b/185991357) start this earlier
+ start microdroid_manager
+
exec_start derive_sdk
start adbd
diff --git a/microdroid/microdroid_file_contexts b/microdroid/microdroid_file_contexts
index b033110..fc5e456 100644
--- a/microdroid/microdroid_file_contexts
+++ b/microdroid/microdroid_file_contexts
@@ -368,6 +368,7 @@
/system/bin/snapuserd u:object_r:snapuserd_exec:s0
/system/bin/zipfuse u:object_r:zipfuse_exec:s0
/system/bin/microdroid_launcher u:object_r:microdroid_launcher_exec:s0
+/system/bin/microdroid_manager u:object_r:microdroid_manager_exec:s0
#############################
# Vendor files
diff --git a/microdroid/signature/Android.bp b/microdroid/signature/Android.bp
index 35c4e9e..1ce7805 100644
--- a/microdroid/signature/Android.bp
+++ b/microdroid/signature/Android.bp
@@ -38,6 +38,14 @@
],
}
+rust_protobuf {
+ name: "libmicrodroid_signature_proto_rust",
+ crate_name: "microdroid_signature",
+ protos: ["microdroid_signature.proto"],
+ source_stem: "microdroid_signature",
+ host_supported: true,
+}
+
cc_binary {
name: "mk_payload",
srcs: [
diff --git a/microdroid/signature/microdroid_signature.proto b/microdroid/signature/microdroid_signature.proto
index 8816aa8..6ae3756 100644
--- a/microdroid/signature/microdroid_signature.proto
+++ b/microdroid/signature/microdroid_signature.proto
@@ -27,6 +27,8 @@
repeated ApexSignature apexes = 2;
ApkSignature apk = 3;
+
+ string payload_config_path = 4;
}
message ApexSignature {
@@ -54,4 +56,4 @@
string payload_partition_name = 2;
string idsig_partition_name = 3;
-}
\ No newline at end of file
+}
diff --git a/microdroid/signature/mk_payload.cc b/microdroid/signature/mk_payload.cc
index a3501d4..9caf788 100644
--- a/microdroid/signature/mk_payload.cc
+++ b/microdroid/signature/mk_payload.cc
@@ -97,6 +97,7 @@
std::vector<std::string> system_apexes;
std::vector<ApexConfig> apexes;
std::optional<ApkConfig> apk;
+ std::optional<std::string> payload_config_path;
};
#define DO(expr) \
@@ -120,6 +121,16 @@
return ParseJson(value, *s);
}
+template <typename T>
+Result<void> ParseJson(const Json::Value& values, std::vector<T>& parsed) {
+ for (const Json::Value& value : values) {
+ T t;
+ DO(ParseJson(value, t));
+ parsed.push_back(std::move(t));
+ }
+ return {};
+}
+
Result<void> ParseJson(const Json::Value& value, ApexConfig& apex_config) {
DO(ParseJson(value["name"], apex_config.name));
DO(ParseJson(value["path"], apex_config.path));
@@ -134,20 +145,11 @@
return {};
}
-template <typename T>
-Result<void> ParseJson(const Json::Value& values, std::vector<T>& parsed) {
- for (const Json::Value& value : values) {
- T t;
- DO(ParseJson(value, t));
- parsed.push_back(std::move(t));
- }
- return {};
-}
-
Result<void> ParseJson(const Json::Value& value, Config& config) {
DO(ParseJson(value["system_apexes"], config.system_apexes));
DO(ParseJson(value["apexes"], config.apexes));
DO(ParseJson(value["apk"], config.apk));
+ DO(ParseJson(value["payload_config_path"], config.payload_config_path));
return {};
}
@@ -232,6 +234,10 @@
// TODO(jooyung): set idsig partition as well
}
+ if (config.payload_config_path.has_value()) {
+ *signature.mutable_payload_config_path() = config.payload_config_path.value();
+ }
+
std::ofstream out(filename);
return WriteMicrodroidSignature(signature, out);
}
diff --git a/microdroid_manager/Android.bp b/microdroid_manager/Android.bp
new file mode 100644
index 0000000..2c79196
--- /dev/null
+++ b/microdroid_manager/Android.bp
@@ -0,0 +1,21 @@
+package {
+ default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+rust_binary {
+ name: "microdroid_manager",
+ crate_name: "microdroid_manager",
+ srcs: ["src/main.rs"],
+ edition: "2018",
+ prefer_rlib: true,
+ rustlibs: [
+ "libandroid_logger",
+ "libanyhow",
+ "liblog_rust",
+ "libmicrodroid_signature_proto_rust",
+ "libprotobuf",
+ "libserde_json",
+ "libserde",
+ ],
+ init_rc: ["microdroid_manager.rc"],
+}
diff --git a/microdroid_manager/microdroid_manager.rc b/microdroid_manager/microdroid_manager.rc
new file mode 100644
index 0000000..c800002
--- /dev/null
+++ b/microdroid_manager/microdroid_manager.rc
@@ -0,0 +1,4 @@
+service microdroid_manager /system/bin/microdroid_manager
+ disabled
+ # TODO(jooyung) remove this when microdroid_manager becomes a daemon
+ oneshot
\ No newline at end of file
diff --git a/microdroid_manager/src/main.rs b/microdroid_manager/src/main.rs
new file mode 100644
index 0000000..4f87a40
--- /dev/null
+++ b/microdroid_manager/src/main.rs
@@ -0,0 +1,51 @@
+// Copyright 2021, 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.
+
+//! Microdroid Manager
+
+mod payload_config;
+mod signature;
+
+use android_logger::Config;
+use log::{info, Level};
+use payload_config::{Task, VmPayloadConfig};
+use std::io;
+use std::process::Command;
+
+const LOG_TAG: &str = "MicrodroidManager";
+
+fn main() -> io::Result<()> {
+ android_logger::init_once(Config::default().with_tag(LOG_TAG).with_min_level(Level::Debug));
+
+ info!("started.");
+
+ let signature = signature::load()?;
+ if !signature.payload_config_path.is_empty() {
+ let config = VmPayloadConfig::load_from(&signature.payload_config_path)?;
+ if let Some(main_task) = &config.task {
+ exec(main_task)?;
+ }
+ }
+
+ Ok(())
+}
+
+/// executes a task
+/// TODO(jooyung): fork a child process
+fn exec(task: &Task) -> io::Result<()> {
+ info!("executing main task {} {:?}...", task.command, task.args);
+ let exit_status = Command::new(&task.command).args(&task.args).status()?;
+ info!("exit with {}", &exit_status);
+ Ok(())
+}
diff --git a/microdroid_manager/src/payload_config.rs b/microdroid_manager/src/payload_config.rs
new file mode 100644
index 0000000..1dd6d92
--- /dev/null
+++ b/microdroid_manager/src/payload_config.rs
@@ -0,0 +1,41 @@
+// Copyright 2021, 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.
+
+//! VM Payload Config
+
+use log::info;
+use serde::{Deserialize, Serialize};
+use std::fs::File;
+use std::io;
+
+#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
+pub struct VmPayloadConfig {
+ #[serde(default)]
+ pub task: Option<Task>,
+}
+
+#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
+pub struct Task {
+ pub command: String,
+ #[serde(default)]
+ pub args: Vec<String>,
+}
+
+impl VmPayloadConfig {
+ pub fn load_from(path: &str) -> io::Result<VmPayloadConfig> {
+ info!("loading config from {}...", path);
+ let file = File::open(path)?;
+ Ok(serde_json::from_reader(file)?)
+ }
+}
diff --git a/microdroid_manager/src/signature.rs b/microdroid_manager/src/signature.rs
new file mode 100644
index 0000000..4f06885
--- /dev/null
+++ b/microdroid_manager/src/signature.rs
@@ -0,0 +1,40 @@
+// Copyright 2021, 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.
+
+//! MicrodroidSignature from /dev/block/by-name/signature
+//! TODO(jooyung): migrate to "metadata" partition
+
+use log::info;
+use microdroid_signature::microdroid_signature::MicrodroidSignature;
+use protobuf::Message;
+use std::fs::File;
+use std::io;
+use std::io::Read;
+
+const SIGNATURE_PATH: &str = "/dev/block/by-name/signature";
+
+/// loads microdroid_signature from /dev/block/by-name/signature
+pub fn load() -> io::Result<MicrodroidSignature> {
+ info!("loading signature...");
+
+ let mut f = File::open(SIGNATURE_PATH)?;
+ // signature partition is
+ // 4 bytes : size(N) in big endian
+ // N bytes : message for MicrodroidSignature
+ let mut buf = [0u8; 4];
+ f.read_exact(&mut buf)?;
+ let size = i32::from_be_bytes(buf);
+
+ Ok(MicrodroidSignature::parse_from_reader(&mut f.take(size as u64))?)
+}