1 // Copyright 2019 The Chromium OS Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 use std::fs::File;
6 use std::io::BufRead;
7 use std::io::BufReader;
8
9 use crate::fdt::{Error, FdtWriter, Result};
10
parse_fstab_line(line: &str) -> Result<Vec<String>>11 fn parse_fstab_line(line: &str) -> Result<Vec<String>> {
12 let vec: Vec<&str> = line.split_whitespace().collect();
13 if vec.len() != 5 {
14 return Err(Error::FdtFileParseError);
15 }
16 Ok(vec.iter().map(|s| s.to_string()).collect())
17 }
18
19 /// Creates a flattened device tree containing all of the parameters used
20 /// by Android.
21 ///
22 /// # Arguments
23 ///
24 /// * `fdt` - The DTB to modify. The top-most node should be open.
25 /// * `android-fstab` - A text file of Android fstab entries to add to the DTB
create_android_fdt(fdt: &mut FdtWriter, fstab: File) -> Result<()>26 pub fn create_android_fdt(fdt: &mut FdtWriter, fstab: File) -> Result<()> {
27 let vecs = BufReader::new(fstab)
28 .lines()
29 .map(|l| parse_fstab_line(&l.map_err(Error::FdtIoError)?))
30 .collect::<Result<Vec<Vec<String>>>>()?;
31 let firmware_node = fdt.begin_node("firmware")?;
32 let android_node = fdt.begin_node("android")?;
33 fdt.property_string("compatible", "android,firmware")?;
34
35 let (dtprop, fstab): (_, Vec<_>) = vecs.into_iter().partition(|x| x[0] == "#dt-vendor");
36 let vendor_node = fdt.begin_node("vendor")?;
37 for vec in dtprop {
38 let content = std::fs::read_to_string(&vec[2]).map_err(Error::FdtIoError)?;
39 fdt.property_string(&vec[1], &content)?;
40 }
41 fdt.end_node(vendor_node)?;
42 let fstab_node = fdt.begin_node("fstab")?;
43 fdt.property_string("compatible", "android,fstab")?;
44 for vec in fstab {
45 let partition = &vec[1][1..];
46 let partition_node = fdt.begin_node(partition)?;
47 fdt.property_string("compatible", &("android,".to_owned() + partition))?;
48 fdt.property_string("dev", &vec[0])?;
49 fdt.property_string("type", &vec[2])?;
50 fdt.property_string("mnt_flags", &vec[3])?;
51 fdt.property_string("fsmgr_flags", &vec[4])?;
52 fdt.end_node(partition_node)?;
53 }
54 fdt.end_node(fstab_node)?;
55 fdt.end_node(android_node)?;
56 fdt.end_node(firmware_node)?;
57 Ok(())
58 }
59