Function parse_os_release

crates/lib/src/bootc_composefs/boot.rs:452–476

Parses /usr/lib/os-release and returns (id, title, version) Expects a reference to the root of the filesystem, or the root of a mounted EROFS

(root: &Dir)

/// Expects a reference to the root of the filesystem, or the root
/// of a mounted EROFS
pub fn parse_os_release(root: &Dir) -> Result<Option<(String, Option<String>, Option<String>)>> {
    // Every update should have its own /usr/lib/os-release
    let file = root
        .open_optional("usr/lib/os-release")
        .context("Opening usr/lib/os-release")?;

    let Some(mut os_rel_file) = file else {
        return Ok(None);
    };

    let mut file_contents = String::new();
    os_rel_file.read_to_string(&mut file_contents)?;

    let parsed = OsReleaseInfo::parse(&file_contents);

    let os_id = parsed
        .get_value(&["ID"])
        .unwrap_or_else(|| "bootc".to_string());

    Ok(Some((
        os_id,
        parsed.get_pretty_name(),
        parsed.get_version(),
    )))
}

struct BLSEntryPath {
    /// Where to write vmlinuz/initrd