cpio-deku

Library and binaries for the reading, creating, and modification of cpio.

As we rely on an unreleased version of deku, this isn't yet published on crates.io.

Usage

tool to extract and list cpio filesystems

Usage: uncpio [OPTIONS] [ARCHIVE]

Arguments:
  [ARCHIVE]  CPIO path

Options:
  -o, --offset <BYTES>   Skip BYTES at the start of FILESYSTEM [default: 0]
  -d, --dest <PATHNAME>  Extract to [PATHNAME] [default: out]
  -h, --help             Print help
  -V, --version          Print version

Read

let mut file = File::open("archive.cpio").unwrap();
let mut archive = ArchiveReader::from_reader(&mut file).unwrap();

// extract bytes from all in archive
for object in &archive.objects.inner {
    let mut out = OpenOptions::new().write(true).create(true).open(object.name).unwrap();
    archive.reader.extract_data(object, &mut out).unwrap();
}

Write

let file = File::create(&new_path).unwrap();
let mut writer = ArchiveWriter::new(Box::new(file));

// A
let a_data = "a\n".as_bytes();
let a_header = Header {
    ino: 9119860,
    mode: 33188,
    uid: 1000,
    gid: 1000,
    nlink: 1,
    mtime: 1703901104,
    devmajor: 0,
    devminor: 38,
    rdevmajor: 0,
    rdevminor: 0,
};
writer.push_file(Cursor::new(a_data), CString::new("cpio-in/a").unwrap(), a_header).unwrap();

// write to archive
writer.write().unwrap();