bcachefs-tools/rust-src/bch_bindgen/src/rs.rs

use crate::bcachefs;
use crate::{error, info};
use colored::Colorize;

pub const SUPERBLOCK_MAGIC: uuid::Uuid =
    uuid::Uuid::from_u128(0x_c68573f6_4e1a_45ca_8265_f57f48ba6d81);

extern "C" {
    pub static stdout: *mut libc::FILE;
}

pub enum ReadSuperErr {
    Io(std::io::Error),
}

type RResult<T> = std::io::Result<std::io::Result<T>>;

pub fn read_super_opts(
    path: &std::path::Path,
    mut opts: bcachefs::bch_opts,
) -> RResult<bcachefs::bch_sb_handle> {
    use std::os::unix::ffi::OsStrExt;
    let path = std::ffi::CString::new(path.as_os_str().as_bytes())?;

    let mut sb = std::mem::MaybeUninit::zeroed();

    let ret =
        unsafe { crate::bcachefs::bch2_read_super(path.as_ptr(), &mut opts, sb.as_mut_ptr()) };
    println!("{}", ret);

    info!("something");
    error!("an error");
    String::from("something").bright_black();
    match -ret {
        libc::EACCES => Err(std::io::Error::new(
            std::io::ErrorKind::PermissionDenied,
            "Access Permission Denied",
        )),
        0 => Ok(Ok(unsafe { sb.assume_init() })),
        22 => Ok(Err(std::io::Error::new(
            std::io::ErrorKind::InvalidData,
            "Not a BCacheFS SuperBlock",
        ))),
        code => {
            println!("BCacheFS return error code: {}", code);
            Ok(Err(std::io::Error::new(
                std::io::ErrorKind::Other,
                "Failed to Read SuperBlock",
            )))
        }
    }
}

pub fn read_super(path: &std::path::Path) -> RResult<bcachefs::bch_sb_handle> {
    let opts = bcachefs::bch_opts::default(); //unsafe {std::mem::MaybeUninit::zeroed().assume_init()};
    read_super_opts(path, opts)
}