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use anyhow::bail;
use clap::Parser;
use fatfs::{FatType, FormatVolumeOptions};
use fscommon::StreamSlice;
use std::fs::{File, OpenOptions};
use std::io::{Read, Write};
use std::os::unix::fs::PermissionsExt;
use std::os::unix::io::AsRawFd;
use std::path::Path;
const MODE_DEVICE: u32 = 1 << 14;
#[allow(non_upper_case_globals)]
const KiB: u32 = 1024;
#[allow(non_upper_case_globals)]
const MiB: u32 = 1024 * KiB;
#[derive(Debug, Parser)]
#[command(author = "The Rustkrazy Authors", version = "v0.1.0", about = "Generate a rustkrazy image.", long_about = None)]
struct Args {
/// Output location of a full image.
#[arg(short = 'o', long = "overwrite")]
overwrite: String,
/// Size of image file in bytes. Used if --overwrite is a file.
#[arg(short = 'n', long = "size")]
size: Option<u64>,
}
#[cfg(target_os = "linux")]
fn device_size(file: &File, path: String) -> anyhow::Result<u64> {
use nix::ioctl_read;
const BLKGETSIZE64_CODE: u8 = 0x12;
const BLKGETSIZE64_SEQ: u8 = 114;
ioctl_read!(ioctl_blkgetsize64, BLKGETSIZE64_CODE, BLKGETSIZE64_SEQ, u64);
let fd = file.as_raw_fd();
let mut dev_size = 0;
let dev_size_ptr = &mut dev_size as *mut u64;
unsafe {
match ioctl_blkgetsize64(fd, dev_size_ptr) {
Ok(_) => {}
Err(_) => bail!("{} does not seem to be a device", path),
}
}
Ok(dev_size)
}
fn write_mbr_partition_table(file: &mut File, dev_size: u64) -> anyhow::Result<()> {
const NOPART: &[u8] = &[0; 16];
const INACTIVE: &[u8] = &[0x00];
const ACTIVE: &[u8] = &[0x80];
const INVALID_CHS: &[u8] = &[0xFF, 0xFF, 0xFE]; // Causes sector values to be used
const FAT: &[u8] = &[0xc];
const LINUX: &[u8] = &[0x83];
const SQUASHFS: &[u8] = LINUX;
const SIGNATURE: &[u8] = &[0x55, 0xAA];
file.write_all(&[0; 446])?; // Boot code
// Partition 1: boot
file.write_all(ACTIVE)?;
file.write_all(INVALID_CHS)?;
file.write_all(FAT)?;
file.write_all(INVALID_CHS)?;
file.write_all(&2048_u32.to_le_bytes())?; // Start at sector 2048
file.write_all(&(256 * MiB / 512).to_le_bytes())?; // 256 MiB in size
// Partition 2 rootfs
file.write_all(INACTIVE)?;
file.write_all(INVALID_CHS)?;
file.write_all(SQUASHFS)?;
file.write_all(INVALID_CHS)?;
file.write_all(&(2048 + 256 * MiB / 512).to_le_bytes())?;
file.write_all(&(dev_size as u32 / 512 - 8192 - 256 * MiB / 512).to_le_bytes())?;
// Partition 3 (unused)
file.write_all(NOPART)?;
// Partition 4 (unused)
file.write_all(NOPART)?;
file.write_all(SIGNATURE)?;
println!("Partition table written successfully");
Ok(())
}
fn partition(file: &mut File, dev_size: u64) -> anyhow::Result<()> {
write_mbr_partition_table(file, dev_size)?;
Ok(())
}
fn partition_device(file: &mut File, overwrite: String) -> anyhow::Result<()> {
let dev_size = device_size(file, overwrite)?;
println!("Destination holds {} bytes", dev_size);
partition(file, dev_size)?;
Ok(())
}
fn copy_file(dst: &mut fatfs::File<StreamSlice<&mut File>>, src: &mut File) -> anyhow::Result<()> {
let mut buf = Vec::new();
src.read_to_end(&mut buf)?;
dst.write_all(&buf)?;
Ok(())
}
fn write_boot(mut partition: fscommon::StreamSlice<&mut File>) -> anyhow::Result<()> {
let format_opts = FormatVolumeOptions::new().fat_type(FatType::Fat32);
fatfs::format_volume(&mut partition, format_opts)?;
let kernel_dir = Path::new(".");
let fs = fatfs::FileSystem::new(partition, fatfs::FsOptions::new())?;
let root_dir = fs.root_dir();
let mut kernel = root_dir.create_file("vmlinuz")?;
copy_file(&mut kernel, &mut File::open(kernel_dir.join("vmlinuz"))?)?;
println!("Boot filesystem created successfully");
Ok(())
}
fn overwrite_device(file: &mut File, overwrite: String) -> anyhow::Result<()> {
partition_device(file, overwrite)?;
let boot_partition = StreamSlice::new(file, 2048 * 512, (2048 * 512 + 256 * MiB - 1).into())?;
write_boot(boot_partition)?;
Ok(())
}
fn overwrite_file(file: &mut File, file_size: u64) -> anyhow::Result<()> {
partition(file, file_size)?;
let boot_partition = StreamSlice::new(file, 2048 * 512, (2048 * 512 + 256 * MiB - 1).into())?;
write_boot(boot_partition)?;
Ok(())
}
fn main() -> anyhow::Result<()> {
let args = Args::parse();
let mut file = OpenOptions::new()
.read(true)
.write(true)
.create(true)
.open(args.overwrite.clone())?;
if file.metadata()?.permissions().mode() & MODE_DEVICE != 0 {
overwrite_device(&mut file, args.overwrite)
} else {
match args.size {
Some(v) => overwrite_file(&mut file, v),
None => bail!("Files require --size to be specified"),
}
}
}
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