linuxutils-system 0.1.0

System utilities from linuxutils
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58

use linuxutils_common::man::ManContent;

pub const MAN: ManContent = ManContent::empty();

use clap::Parser;
use std::{fs::File, io, os::unix::io::AsRawFd, process::ExitCode};

const FIFREEZE: libc::c_ulong = 0xc0045877;
const FITHAW: libc::c_ulong = 0xc0045878;

#[derive(Parser)]
#[command(
    name = "fsfreeze",
    about = "Suspend or resume access to a filesystem"
)]
pub struct Args {
    /// Freeze the filesystem
    #[arg(short = 'f', long, conflicts_with = "unfreeze")]
    freeze: bool,

    /// Unfreeze the filesystem
    #[arg(short = 'u', long, conflicts_with = "freeze")]
    unfreeze: bool,

    /// Mountpoint of the filesystem
    mountpoint: String,
}

fn fsfreeze_ioctl(path: &str, ioctl_nr: libc::c_ulong) -> io::Result<()> {
    let f = File::open(path)?;
    let arg: libc::c_int = 0;
    let ret = unsafe { libc::ioctl(f.as_raw_fd(), ioctl_nr, &arg) };
    if ret < 0 {
        Err(io::Error::last_os_error())
    } else {
        Ok(())
    }
}

pub fn run(args: Args) -> ExitCode {
    if !args.freeze && !args.unfreeze {
        eprintln!("fsfreeze: one of --freeze or --unfreeze must be specified");
        return ExitCode::FAILURE;
    }

    let (ioctl_nr, action) = if args.freeze {
        (FIFREEZE, "freeze")
    } else {
        (FITHAW, "unfreeze")
    };

    if let Err(e) = fsfreeze_ioctl(&args.mountpoint, ioctl_nr) {
        eprintln!("fsfreeze: failed to {action} {}: {e}", args.mountpoint);
        return ExitCode::FAILURE;
    }

    ExitCode::SUCCESS
}