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use structopt::StructOpt;
use anyhow::anyhow;
#[macro_export]
macro_rules! c_str {
($lit:expr) => {
unsafe { std::ffi::CStr::from_ptr(concat!($lit, "\0").as_ptr() as *const std::os::raw::c_char)
.to_bytes_with_nul()
.as_ptr() as *const std::os::raw::c_char }
};
}
#[derive(Debug)]
struct ErrnoError(errno::Errno);
impl std::fmt::Display for ErrnoError {
fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
self.0.fmt(f)
}
}
impl std::error::Error for ErrnoError {}
#[derive(Debug)]
pub(crate) enum KeyLocation {
Fail,
Wait,
Ask,
}
impl std::str::FromStr for KeyLocation {
type Err = anyhow::Error;
fn from_str(s: &str) -> anyhow::Result<Self> {
use anyhow::anyhow;
match s {
"fail" => Ok(Self::Fail),
"wait" => Ok(Self::Wait),
"ask" => Ok(Self::Ask),
_ => Err(anyhow!("invalid password option"))
}
}
}
#[derive(StructOpt, Debug)]
/// Mount a bcachefs filesystem by its UUID.
struct Options {
/// Where the password would be loaded from.
///
/// Possible values are:
/// "fail" - don't ask for password, fail if filesystem is encrypted;
/// "wait" - wait for password to become available before mounting;
/// "ask" - prompt the user for password;
#[structopt(short, long, default_value = "fail")]
key_location: KeyLocation,
/// External UUID of the bcachefs filesystem
uuid: uuid::Uuid,
/// Where the filesystem should be mounted. If not set, then the filesystem
/// won't actually be mounted. But all steps preceeding mounting the
/// filesystem (e.g. asking for passphrase) will still be performed.
mountpoint: Option<std::path::PathBuf>,
/// Mount options
#[structopt(short, default_value = "")]
options: String,
}
mod filesystem;
mod key;
mod keyutils {
#![allow(non_upper_case_globals)]
#![allow(non_camel_case_types)]
#![allow(non_snake_case)]
#![allow(unused)]
include!(concat!(env!("OUT_DIR"), "/keyutils.rs"));
}
mod bcachefs {
#![allow(non_upper_case_globals)]
#![allow(non_camel_case_types)]
#![allow(non_snake_case)]
#![allow(unused)]
include!(concat!(env!("OUT_DIR"), "/bcachefs.rs"));
use bitfield::bitfield;
bitfield! {
pub struct bch_scrypt_flags(u64);
pub N, _: 15, 0;
pub R, _: 31, 16;
pub P, _: 47, 32;
}
bitfield! {
pub struct bch_crypt_flags(u64);
TYPE, _: 4, 0;
}
use memoffset::offset_of;
impl bch_sb_field_crypt {
pub fn scrypt_flags(&self) -> Option<bch_scrypt_flags> {
let t = bch_crypt_flags(self.flags);
if t.TYPE() != bch_kdf_types::BCH_KDF_SCRYPT as u64 {
None
} else {
Some(bch_scrypt_flags(self.kdf_flags))
}
}
pub fn key(&self) -> &bch_encrypted_key {
&self.key
}
}
impl bch_sb {
pub fn crypt(&self) -> Option<&bch_sb_field_crypt> {
unsafe {
let ptr = bch2_sb_field_get(
self as *const _ as *mut _,
bch_sb_field_type::BCH_SB_FIELD_crypt,
) as *const u8;
if ptr.is_null() {
None
} else {
let offset = offset_of!(bch_sb_field_crypt, field);
Some(&*((ptr.sub(offset)) as *const _))
}
}
}
pub fn uuid(&self) -> uuid::Uuid {
uuid::Uuid::from_bytes(self.user_uuid.b)
}
/// Get the nonce used to encrypt the superblock
pub fn nonce(&self) -> nonce {
use byteorder::{ReadBytesExt, LittleEndian};
let mut internal_uuid = &self.uuid.b[..];
let dword1 = internal_uuid.read_u32::<LittleEndian>().unwrap();
let dword2 = internal_uuid.read_u32::<LittleEndian>().unwrap();
nonce { d: [0, 0, dword1, dword2] }
}
}
impl bch_sb_handle {
pub fn sb(&self) -> &bch_sb {
unsafe { &*self.sb }
}
}
}
fn main_inner() -> anyhow::Result<()> {
use itertools::Itertools;
use log::{info, trace};
env_logger::init();
let opt = Options::from_args();
trace!("{:?}", opt);
let fss = filesystem::probe_filesystems()?;
info!("Found {} bcachefs filesystems: ", fss.len());
for fs in fss.values() {
info!(
"{} ({}): {}",
fs.uuid(),
if fs.encrypted() {
"encrypted"
} else {
"unencrypted"
},
fs.devices().iter().map(|d| d.display()).join(" ")
);
}
if let Some(fs) = fss.get(&opt.uuid) {
if fs.encrypted() {
info!("Making sure key is loaded for this filesystem");
key::prepare_key(&fs, opt.key_location)?;
}
if let Some(p) = opt.mountpoint {
fs.mount(&p, &opt.options)
} else {
Ok(())
}
} else {
Err(anyhow!("Filesystem {} is not found", opt.uuid))
}
}
#[no_mangle]
pub extern "C" fn main() {
if let Err(e) = main_inner() {
println!("Error: {:?}", e);
}
}
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