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use atty::Stream;
use bch_bindgen::{bcachefs, bcachefs::bch_sb_handle, debug, error, info};
use clap::Parser;
use colored::Colorize;
use uuid::Uuid;
use std::path::PathBuf;
use crate::key;
use crate::key::KeyLoc;
use std::ffi::{CStr, CString, OsStr, c_int, c_char, c_void};
use std::os::unix::ffi::OsStrExt;
fn mount_inner(
src: String,
target: impl AsRef<std::path::Path>,
fstype: &str,
mountflags: u64,
data: Option<String>,
) -> anyhow::Result<()> {
// bind the CStrings to keep them alive
let src = CString::new(src)?;
let target = CString::new(target.as_ref().as_os_str().as_bytes())?;
let data = data.map(CString::new).transpose()?;
let fstype = CString::new(fstype)?;
// convert to pointers for ffi
let src = src.as_c_str().to_bytes_with_nul().as_ptr() as *const c_char;
let target = target.as_c_str().to_bytes_with_nul().as_ptr() as *const c_char;
let data = data.as_ref().map_or(std::ptr::null(), |data| {
data.as_c_str().to_bytes_with_nul().as_ptr() as *const c_void
});
let fstype = fstype.as_c_str().to_bytes_with_nul().as_ptr() as *const c_char;
let ret = {
info!("mounting filesystem");
// REQUIRES: CAP_SYS_ADMIN
unsafe { libc::mount(src, target, fstype, mountflags, data) }
};
match ret {
0 => Ok(()),
_ => Err(crate::ErrnoError(errno::errno()).into()),
}
}
/// Parse a comma-separated mount options and split out mountflags and filesystem
/// specific options.
fn parse_mount_options(options: impl AsRef<str>) -> (Option<String>, u64) {
use either::Either::*;
debug!("parsing mount options: {}", options.as_ref());
let (opts, flags) = options
.as_ref()
.split(",")
.map(|o| match o {
"dirsync" => Left(libc::MS_DIRSYNC),
"lazytime" => Left(1 << 25), // MS_LAZYTIME
"mand" => Left(libc::MS_MANDLOCK),
"noatime" => Left(libc::MS_NOATIME),
"nodev" => Left(libc::MS_NODEV),
"nodiratime" => Left(libc::MS_NODIRATIME),
"noexec" => Left(libc::MS_NOEXEC),
"nosuid" => Left(libc::MS_NOSUID),
"relatime" => Left(libc::MS_RELATIME),
"remount" => Left(libc::MS_REMOUNT),
"ro" => Left(libc::MS_RDONLY),
"rw" => Left(0),
"strictatime" => Left(libc::MS_STRICTATIME),
"sync" => Left(libc::MS_SYNCHRONOUS),
"" => Left(0),
o @ _ => Right(o),
})
.fold((Vec::new(), 0), |(mut opts, flags), next| match next {
Left(f) => (opts, flags | f),
Right(o) => {
opts.push(o);
(opts, flags)
}
});
use itertools::Itertools;
(
if opts.len() == 0 {
None
} else {
Some(opts.iter().join(","))
},
flags,
)
}
fn mount(
device: String,
target: impl AsRef<std::path::Path>,
options: impl AsRef<str>,
) -> anyhow::Result<()> {
let (data, mountflags) = parse_mount_options(options);
info!(
"mounting bcachefs filesystem, {}",
target.as_ref().display()
);
mount_inner(device, target, "bcachefs", mountflags, data)
}
fn read_super_silent(path: &std::path::PathBuf) -> anyhow::Result<bch_sb_handle> {
// Stop libbcachefs from spamming the output
let _gag = gag::BufferRedirect::stdout().unwrap();
bch_bindgen::rs::read_super(&path)
}
fn get_devices_by_uuid(uuid: Uuid) -> anyhow::Result<Vec<(PathBuf, bch_sb_handle)>> {
debug!("enumerating udev devices");
let mut udev = udev::Enumerator::new()?;
udev.match_subsystem("block")?;
let devs = udev
.scan_devices()?
.into_iter()
.filter_map(|dev| dev.devnode().map(ToOwned::to_owned))
.map(|dev| (dev.clone(), read_super_silent(&dev)))
.filter_map(|(dev, sb)| sb.ok().map(|sb| (dev, sb)))
.filter(|(_, sb)| sb.sb().uuid() == uuid)
.collect();
Ok(devs)
}
/// Mount a bcachefs filesystem by its UUID.
#[derive(Parser, Debug)]
#[command(author, version, about, long_about = None)]
struct Cli {
/// 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;
#[arg(short, long, default_value = "ask", verbatim_doc_comment)]
key_location: KeyLoc,
/// Device, or UUID=<UUID>
dev: String,
/// 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: std::path::PathBuf,
/// Mount options
#[arg(short, default_value = "")]
options: String,
/// Force color on/off. Default: autodetect tty
#[arg(short, long, action = clap::ArgAction::Set, default_value_t=atty::is(Stream::Stdout))]
colorize: bool,
/// Verbose mode
#[arg(short, long, action = clap::ArgAction::Count)]
verbose: u8,
}
fn cmd_mount_inner(opt: Cli) -> anyhow::Result<()> {
let (devs, sbs) = if opt.dev.starts_with("UUID=") {
let uuid = opt.dev.replacen("UUID=", "", 1);
let uuid = Uuid::parse_str(&uuid)?;
let devs_sbs = get_devices_by_uuid(uuid)?;
let devs_strs: Vec<_> = devs_sbs.iter().map(|(dev, _)| dev.clone().into_os_string().into_string().unwrap()).collect();
let devs_str = devs_strs.join(":");
let sbs = devs_sbs.iter().map(|(_, sb)| *sb).collect();
(devs_str, sbs)
} else {
let mut sbs = Vec::new();
for dev in opt.dev.split(':') {
let dev = PathBuf::from(dev);
sbs.push(bch_bindgen::rs::read_super(&dev)?);
}
(opt.dev, sbs)
};
if unsafe { bcachefs::bch2_sb_is_encrypted(sbs[0].sb) } {
let key = opt
.key_location
.0
.ok_or_else(|| anyhow::anyhow!("no keyoption specified for locked filesystem"))?;
key::prepare_key(&sbs[0], key)?;
}
mount(devs, &opt.mountpoint, &opt.options)?;
Ok(())
}
#[no_mangle]
pub extern "C" fn cmd_mount(argc: c_int, argv: *const *const c_char) {
let argv: Vec<_> = (0..argc)
.map(|i| unsafe { CStr::from_ptr(*argv.add(i as usize)) })
.map(|i| OsStr::from_bytes(i.to_bytes()))
.collect();
let opt = Cli::parse_from(argv);
bch_bindgen::log::set_verbose_level(opt.verbose + bch_bindgen::log::ERROR);
colored::control::set_override(opt.colorize);
if let Err(e) = cmd_mount_inner(opt) {
error!("Fatal error: {}", e);
}
}
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