is_wsl/
lib.rs

1extern crate is_docker;
2extern crate once_cell;
3
4use once_cell::sync::OnceCell;
5use std::{fs::File, io::Read};
6
7pub fn is_wsl() -> bool {
8    static CACHED_RESULT: OnceCell<bool> = OnceCell::new();
9
10    *CACHED_RESULT.get_or_init(|| {
11        if std::env::consts::OS != "linux" {
12            return false;
13        }
14
15        if let Ok(os_release) = get_os_release() {
16            if os_release.to_lowercase().contains("microsoft") {
17                return !is_docker::is_docker();
18            }
19        }
20
21        if proc_version_includes_microsoft() {
22            !is_docker::is_docker()
23        } else {
24            false
25        }
26    })
27}
28
29fn proc_version_includes_microsoft() -> bool {
30    match std::fs::read_to_string("/proc/version") {
31        Ok(file_contents) => file_contents.to_lowercase().contains("microsoft"),
32        Err(_) => false,
33    }
34}
35
36// This function is copied from the sys-info crate to avoid taking a dependency on all of sys-info
37// https://docs.rs/sys-info/0.9.1/src/sys_info/lib.rs.html#426-433
38//
39// The MIT License (MIT)
40//
41// Copyright (c) 2015 Siyu Wang
42//
43// Permission is hereby granted, free of charge, to any person obtaining a copy
44// of this software and associated documentation files (the "Software"), to deal
45// in the Software without restriction, including without limitation the rights
46// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
47// copies of the Software, and to permit persons to whom the Software is
48// furnished to do so, subject to the following conditions:
49//
50// The above copyright notice and this permission notice shall be included in all
51// copies or substantial portions of the Software.
52//
53// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
54// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
55// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
56// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
57// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
58// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
59// SOFTWARE.
60fn get_os_release() -> Result<String, std::io::Error> {
61    let mut s = String::new();
62    File::open("/proc/sys/kernel/osrelease")?.read_to_string(&mut s)?;
63    s.pop(); // pop '\n'
64    Ok(s)
65}
is_wsl/lib.rs

is_wsl/
lib.rs
