Crate wslapi

APIs for managing the Windows Subsystem for Linux (wslapi.h)

use wslapi::*;

let wsl = Library::new().unwrap();

let nonexistant = "Nonexistant";
assert!(!wsl.is_distribution_registered(nonexistant));
assert!(wsl.get_distribution_configuration(nonexistant).is_err());

let mut found = 0;
for distro in registry::distribution_names() {
    if !wsl.is_distribution_registered(&distro) { continue }
    found += 1;

    let c = wsl.get_distribution_configuration(&distro).unwrap();
    assert!(c.default_uid == 0 || (1000 ..= 2000).contains(&c.default_uid));
    // 0 == root, 1000+ == regular user
    assert!(c.flags & WSL_DISTRIBUTION_FLAGS::DEFAULT == WSL_DISTRIBUTION_FLAGS::DEFAULT);
    // `c.flags` contains extra, undocumented flags like 0x8
    assert!((1..=2).contains(&c.version)); // WSL version

    wsl.launch_interactive(&distro, "echo testing 123", true).unwrap();

    let stdin  = "echo testing 456\necho PATH: ${PATH}\n";
    let stdout = std::fs::File::create("target/basic.txt").unwrap();
    let stderr = (); // shorthand for Stdio::null()
    wsl.launch(&distro, "sh", true, stdin, stdout, stderr).unwrap().wait().unwrap();

    for exit in [0, 1, 2, 3, 0xFF, 0x100, 0x101, 0x1FF].iter().copied() {
        let script = format!("exit {}", exit);
        let wsl = wsl.launch(&distro, "sh", true, script, (), ()).unwrap();
        let code = wsl.wait().unwrap().code().unwrap();
        if code == !0 {
            // May happen if WSL doesn't know the exit code?  On my machine, this
            // only happens for Ubuntu 20.04, but on appveyor this happens on Ubuntu-18.04
            // or Ubuntu-16.04 as well.
        } else if code == 1 && distro == "docker-desktop-data" {
            // Not launchable?
        } else if exit & 0xFF == 0 {
            // 0x100 may be truncated to 0, or coerced to something else
            assert!(
                code == exit || code == 0,
                "distro {}, exit {} != code {}",
                distro.to_string_lossy(), exit, code
            );
        } else {
            // 0x101 may be truncated to 1 per POSIX
            assert!(
                code == exit || code == exit & 0xFF,
                "distro {}, exit {} != code {}",
                distro.to_string_lossy(), exit, code
            );
        }
    }
}
assert_ne!(0, found, "Found {} distros", found);

Modules

registry

wslapi.h "adjacent" registry keys to fill in where wslapi.h is missing functionality

Structs

Configuration	The structified result of WslGetDistributionConfiguration
EnvironmentVariables	The environment variables of WslGetDistributionConfiguration.
EnvironmentVariablesIter	Iterator over &EnvironmentVariables
Error	A crate error. Convertable to std::io::Error, Box<dyn std::error::Error>
ExitStatus	The exit status of a WSL process.
Library	A loaded wslapi.dll or api-ms-win-wsl-api-l1-1-0.dll instance
Process	A WslLaunched Process
Stdio	A WslLaunch stdin, stdout, or stderr parameter
WSL_DISTRIBUTION_FLAGS	Flags specifying WSL behavior

Type Definitions

Result

A crate Result.