6c76aa434d
This also moves a couple of required utilities such as logrotate and some file descriptor methods to pbs-tools. Note that the logrotate usage and run-dir handling should be improved to work as a regular user as this *should* (IMHO) be a regular unprivileged command (including running qemu given the kvm privileges...) Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
75 lines
3.0 KiB
Rust
75 lines
3.0 KiB
Rust
//! Provides a very basic "newc" format cpio encoder.
|
|
//! See 'man 5 cpio' for format details, as well as:
|
|
//! https://www.kernel.org/doc/html/latest/driver-api/early-userspace/buffer-format.html
|
|
//! This does not provide full support for the format, only what is needed to include files in an
|
|
//! initramfs intended for a linux kernel.
|
|
use std::ffi::{CString, CStr};
|
|
|
|
use anyhow::{bail, Error};
|
|
use tokio::io::{copy, AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt};
|
|
|
|
/// Write a cpio file entry to an AsyncWrite.
|
|
pub async fn append_file<W: AsyncWrite + Unpin, R: AsyncRead + Unpin>(
|
|
mut target: W,
|
|
content: R,
|
|
name: &CStr,
|
|
inode: u16,
|
|
mode: u16,
|
|
uid: u16,
|
|
gid: u16,
|
|
// negative mtimes are generally valid, but cpio defines all fields as unsigned
|
|
mtime: u64,
|
|
// c_filesize has 8 bytes, but man page claims that 4 GB files are the maximum, let's be safe
|
|
size: u32,
|
|
) -> Result<(), Error> {
|
|
let name = name.to_bytes_with_nul();
|
|
|
|
target.write_all(b"070701").await?; // c_magic
|
|
print_cpio_hex(&mut target, inode as u64).await?; // c_ino
|
|
print_cpio_hex(&mut target, mode as u64).await?; // c_mode
|
|
print_cpio_hex(&mut target, uid as u64).await?; // c_uid
|
|
print_cpio_hex(&mut target, gid as u64).await?; // c_gid
|
|
print_cpio_hex(&mut target, 0).await?; // c_nlink
|
|
print_cpio_hex(&mut target, mtime as u64).await?; // c_mtime
|
|
print_cpio_hex(&mut target, size as u64).await?; // c_filesize
|
|
print_cpio_hex(&mut target, 0).await?; // c_devmajor
|
|
print_cpio_hex(&mut target, 0).await?; // c_devminor
|
|
print_cpio_hex(&mut target, 0).await?; // c_rdevmajor
|
|
print_cpio_hex(&mut target, 0).await?; // c_rdevminor
|
|
print_cpio_hex(&mut target, name.len() as u64).await?; // c_namesize
|
|
print_cpio_hex(&mut target, 0).await?; // c_check (ignored for newc)
|
|
|
|
target.write_all(name).await?;
|
|
let header_size = 6 + 8*13 + name.len();
|
|
let mut name_pad = header_size;
|
|
while name_pad & 3 != 0 {
|
|
target.write_u8(0).await?;
|
|
name_pad += 1;
|
|
}
|
|
|
|
let mut content = content.take(size as u64);
|
|
let copied = copy(&mut content, &mut target).await?;
|
|
if copied < size as u64 {
|
|
bail!("cpio: not enough data, or size to big - encoding invalid");
|
|
}
|
|
let mut data_pad = copied;
|
|
while data_pad & 3 != 0 {
|
|
target.write_u8(0).await?;
|
|
data_pad += 1;
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
/// Write the TRAILER!!! file to an AsyncWrite, signifying the end of a cpio archive. Note that you
|
|
/// can immediately add more files after, to create a concatenated archive, the kernel for example
|
|
/// will merge these upon loading an initramfs.
|
|
pub async fn append_trailer<W: AsyncWrite + Unpin>(target: W) -> Result<(), Error> {
|
|
let name = CString::new("TRAILER!!!").unwrap();
|
|
append_file(target, tokio::io::empty(), &name, 0, 0, 0, 0, 0, 0).await
|
|
}
|
|
|
|
async fn print_cpio_hex<W: AsyncWrite + Unpin>(target: &mut W, value: u64) -> Result<(), Error> {
|
|
target.write_all(format!("{:08x}", value).as_bytes()).await.map_err(|e| e.into())
|
|
}
|