cli: add new control server messages for wsl (#180438)

* cli: add new control server messages for wsl

* support cwd in spawn

cli/src/util/os.rs

@@ -0,0 +1,39 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+#[cfg(windows)]
+pub fn os_release() -> Result<String, std::io::Error> {
+	// The windows API *had* nice GetVersionEx/A APIs, but these were deprecated
+	// in Winodws 8 and there's no newer win API to get version numbers. So
+	// instead read the registry.
+
+	use winreg::{enums::HKEY_LOCAL_MACHINE, RegKey};
+
+	let key = RegKey::predef(HKEY_LOCAL_MACHINE)
+		.open_subkey(r"SOFTWARE\Microsoft\Windows NT\CurrentVersion")?;
+
+	let major: u32 = key.get_value("CurrentMajorVersionNumber")?;
+	let minor: u32 = key.get_value("CurrentMinorVersionNumber")?;
+	let build: String = key.get_value("CurrentBuild")?;
+
+	Ok(format!("{}.{}.{}", major, minor, build))
+}
+
+#[cfg(unix)]
+pub fn os_release() -> Result<String, std::io::Error> {
+	use std::{ffi::CStr, mem};
+
+	unsafe {
+		let mut ret = mem::MaybeUninit::zeroed();
+
+		if libc::uname(ret.as_mut_ptr()) != 0 {
+			return Err(std::io::Error::last_os_error());
+		}
+
+		let ret = ret.assume_init();
+		let c_str: &CStr = CStr::from_ptr(ret.release.as_ptr());
+		Ok(c_str.to_string_lossy().into_owned())
+	}
+}