1 // Copyright 2021, The Android Open Source Project
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 //! Routines for handling payload
16
17 use crate::instance::ApexData;
18 use crate::ioutil::wait_for_file;
19 use anyhow::Result;
20 use apexutil::verify;
21 use log::info;
22 use microdroid_metadata::{read_metadata, ApexPayload, Metadata};
23 use std::time::Duration;
24
25 const PAYLOAD_METADATA_PATH: &str = "/dev/block/by-name/payload-metadata";
26 const WAIT_TIMEOUT: Duration = Duration::from_secs(10);
27
28 /// Loads payload metadata from /dev/block/by-name/payload-metadata
load_metadata() -> Result<Metadata>29 pub fn load_metadata() -> Result<Metadata> {
30 info!("loading payload metadata...");
31 let file = wait_for_file(PAYLOAD_METADATA_PATH, WAIT_TIMEOUT)?;
32 read_metadata(file)
33 }
34
35 /// Loads (name, public_key, root_digest) from payload APEXes
get_apex_data_from_payload(metadata: &Metadata) -> Result<Vec<ApexData>>36 pub fn get_apex_data_from_payload(metadata: &Metadata) -> Result<Vec<ApexData>> {
37 metadata
38 .apexes
39 .iter()
40 .map(|apex| {
41 let name = apex.name.clone();
42 let apex_path = format!("/dev/block/by-name/{}", apex.partition_name);
43 let result = verify(&apex_path)?;
44 Ok(ApexData {
45 name,
46 public_key: result.public_key,
47 root_digest: result.root_digest,
48 last_update_seconds: apex.last_update_seconds,
49 is_factory: apex.is_factory,
50 })
51 })
52 .collect()
53 }
54
55 /// Convert vector of ApexData into Metadata
to_metadata(apex_data: &[ApexData]) -> Metadata56 pub fn to_metadata(apex_data: &[ApexData]) -> Metadata {
57 Metadata {
58 apexes: apex_data
59 .iter()
60 .map(|data| ApexPayload {
61 name: data.name.clone(),
62 public_key: data.public_key.clone(),
63 root_digest: data.root_digest.clone(),
64 last_update_seconds: data.last_update_seconds,
65 is_factory: data.is_factory,
66 ..Default::default()
67 })
68 .collect(),
69 ..Default::default()
70 }
71 }
72