which_fs/
lib.rs

1// SPDX-FileCopyrightText: 2026 Manuel Quarneti <mq1@ik.me>
2// SPDX-License-Identifier: MIT OR Apache-2.0
3
4mod magic;
5
6use std::{fmt, path::Path};
7
8pub enum FsKind {
9    Fat32,
10    Unknown,
11}
12
13impl fmt::Display for FsKind {
14    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
15        match self {
16            FsKind::Fat32 => write!(f, "FAT32"),
17            FsKind::Unknown => write!(f, "Unknown"),
18        }
19    }
20}
21
22#[cfg(unix)]
23pub fn detect(path: &Path) -> rustix::io::Result<FsKind> {
24    let stat = rustix::fs::statfs(path)?;
25
26    #[cfg(target_os = "linux")]
27    let data = stat.f_type;
28
29    #[cfg(target_os = "macos")]
30    let data = stat.f_fstypename;
31
32    let kind = which_kind(data);
33
34    Ok(kind)
35}
36
37#[cfg(windows)]
38pub fn detect(path: &Path) -> windows::core::Result<FsKind> {
39    use std::os::windows::ffi::OsStrExt;
40    use windows::Win32::Foundation::MAX_PATH;
41    use windows::Win32::Storage::FileSystem::{GetVolumeInformationW, GetVolumePathNameW};
42    use windows::core::PCWSTR;
43
44    // Convert input path to null-terminated UTF-16 wide string
45    let path_wide: Vec<u16> = path
46        .as_os_str()
47        .encode_wide()
48        .chain(std::iter::once(0))
49        .collect();
50
51    // Get the Volume Path Name (Mount Point)
52    let mut volume_path = [0u16; MAX_PATH as usize];
53    unsafe {
54        GetVolumePathNameW(PCWSTR(path_wide.as_ptr()), &mut volume_path)?;
55    }
56
57    let mut fs_name_buffer = [0u16; 8];
58    unsafe {
59        GetVolumeInformationW(
60            PCWSTR(volume_path.as_ptr()),
61            None,
62            None,
63            None,
64            None,
65            Some(&mut fs_name_buffer),
66        )?;
67    }
68
69    let kind = which_kind(fs_name_buffer);
70
71    Ok(kind)
72}
73
74#[cfg(target_os = "macos")]
75type RawKind = [i8; 16];
76
77#[cfg(target_os = "linux")]
78type RawKind = rustix::fs::FsWord;
79
80#[cfg(windows)]
81type RawKind = [u16; 8];
82
83fn which_kind(raw: RawKind) -> FsKind {
84    match raw {
85        magic::FAT32 => FsKind::Fat32,
86        _ => FsKind::Unknown,
87    }
88}
which_fs/lib.rs

which_fs/
lib.rs
