Rename "signature" to "metadata"
Bug: 186396424
Test: atest ApexTestCases MicrodroidHostTestCases
Change-Id: Id401d33edc6c6d4aba2b5982c8ab75820faea793
diff --git a/microdroid_manager/src/metadata.rs b/microdroid_manager/src/metadata.rs
new file mode 100644
index 0000000..4f7d7af
--- /dev/null
+++ b/microdroid_manager/src/metadata.rs
@@ -0,0 +1,39 @@
+// 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.
+
+//! Payload metadata from /dev/block/by-name/metadata
+
+use log::info;
+use microdroid_metadata::metadata::Metadata;
+use protobuf::Message;
+use std::fs::File;
+use std::io;
+use std::io::Read;
+
+const METADATA_PATH: &str = "/dev/block/by-name/metadata";
+
+/// loads payload metadata from /dev/block/by-name/metadata
+pub fn load() -> io::Result<Metadata> {
+ info!("loading payload metadata...");
+
+ let mut f = File::open(METADATA_PATH)?;
+ // metadata partition is
+ // 4 bytes : size(N) in big endian
+ // N bytes : message for Metadata
+ let mut buf = [0u8; 4];
+ f.read_exact(&mut buf)?;
+ let size = i32::from_be_bytes(buf);
+
+ Ok(Metadata::parse_from_reader(&mut f.take(size as u64))?)
+}