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_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))?)
+}