zx/
version.rs

1// Copyright 2020 The Fuchsia Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5//! Type-safe bindings for Zircon version-string call.
6
7use crate::sys;
8use std::{slice, str};
9
10/// Return a version string describing the system (kernel).
11/// This string never changes.
12///
13/// Wraps the
14/// [zx_system_get_version_string](https://fuchsia.dev/fuchsia-src/reference/syscalls/system_get_version_string.md)
15/// syscall.
16pub fn system_get_version_string() -> &'static str {
17    unsafe {
18        let sv = sys::zx_system_get_version_string();
19        let slice: &'static [u8] = slice::from_raw_parts(sv.c_str, sv.length);
20        str::from_utf8_unchecked(slice)
21    }
22}
23
24#[cfg(test)]
25mod tests {
26    use super::*;
27    use crate::Status;
28
29    #[test]
30    fn get_version_string() -> Result<(), Status> {
31        let sv = system_get_version_string();
32        let s = sv.to_string();
33
34        // Incremental builders set kernel version string to "nostamp".
35        // See https://fxbug.dev/42154518 for details.
36        if s != "nostamp" {
37            assert!(
38                sv.len() > 20,
39                "system version string [{}] length {} should be > 20",
40                s,
41                sv.len()
42            );
43            assert!(
44                sv.len() < 100,
45                "system version string [{}] length {} should be < 100",
46                s,
47                sv.len()
48            );
49            assert_eq!(s, sv);
50        }
51
52        Ok(())
53    }
54}
zx/version.rs

zx/
version.rs
