99 lines
3.2 KiB
Rust
99 lines
3.2 KiB
Rust
use std::ffi::CStr;
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use std::fs;
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use std::path::Path;
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use std::str::FromStr;
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use anyhow::{Context, Result};
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use crate::common::os_release::OsRelease;
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use crate::common::pe;
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/// A systemd version.
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///
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/// The version is parsed into a u32 tuple because systemd does not follow strict semver
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/// conventions. A major version without a minor version, e.g. "252" is represented as `(252, 0)`.
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#[derive(PartialEq, PartialOrd, Eq, Debug)]
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pub struct SystemdVersion(u32, u32);
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impl SystemdVersion {
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/// Read the systemd version from the `.osrel` section of a systemd-boot binary.
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pub fn from_systemd_boot_binary(path: &Path) -> Result<Self> {
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let file_data = fs::read(path).with_context(|| format!("Failed to read file {path:?}"))?;
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let section_data = pe::read_section_data(&file_data, ".osrel")
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.with_context(|| format!("PE section '.osrel' is empty: {path:?}"))?;
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// The `.osrel` section in the systemd-boot binary is a NUL terminated string and thus needs
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// special handling.
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let section_data_cstr =
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CStr::from_bytes_with_nul(section_data).context("Failed to parse C string.")?;
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let section_data_string = section_data_cstr
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.to_str()
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.context("Failed to convert C string to Rust string.")?;
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let os_release = OsRelease::from_str(section_data_string)
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.with_context(|| format!("Failed to parse os-release from {section_data_string}"))?;
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let version_str = os_release
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.0
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.get("VERSION")
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.context("Failed to extract VERSION key from: {os_release:#?}")?;
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Self::from_str(version_str)
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}
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}
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impl FromStr for SystemdVersion {
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type Err = anyhow::Error;
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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let split_version = s
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.split('.')
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.take(2)
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.map(u32::from_str)
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.collect::<Result<Vec<u32>, std::num::ParseIntError>>()
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.context("Failed to parse version string into u32 vector.")?;
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let major = split_version
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.first()
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.context("Failed to parse major version.")?;
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let minor = split_version.get(1).unwrap_or(&0);
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Ok(Self(major.to_owned(), minor.to_owned()))
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn parse_version_correctly() {
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assert_eq!(parse_version("253"), SystemdVersion(253, 0));
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assert_eq!(parse_version("252.4"), SystemdVersion(252, 4));
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assert_eq!(parse_version("251.11"), SystemdVersion(251, 11));
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}
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#[test]
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fn compare_version_correctly() {
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assert!(parse_version("253") > parse_version("252"));
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assert!(parse_version("253") > parse_version("252.4"));
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assert!(parse_version("251.8") == parse_version("251.8"));
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}
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#[test]
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fn fail_to_parse_version() {
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parse_version_error("");
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parse_version_error("213;k;13");
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parse_version_error("-1.3.123");
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parse_version_error("253-rc1");
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}
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fn parse_version(input: &str) -> SystemdVersion {
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SystemdVersion::from_str(input).unwrap()
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}
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fn parse_version_error(input: &str) {
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assert!(SystemdVersion::from_str(input).is_err());
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}
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}
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