nvpn 4.0.96

CLI and daemon for Nostr VPN private mesh networks
Documentation 
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use super::*;

#[cfg(any(target_os = "linux", test))]
pub(super) fn write_pairing_uri(path: &Path, uri: &str) -> Result<()> {
    let parent = path
        .parent()
        .filter(|parent| !parent.as_os_str().is_empty())
        .unwrap_or_else(|| Path::new("."));
    fs::create_dir_all(parent).with_context(|| format!("failed to create {}", parent.display()))?;
    let name = path
        .file_name()
        .and_then(|name| name.to_str())
        .unwrap_or("pairing-uri");
    let temp = parent.join(format!(
        ".{name}.tmp-{}-{}",
        std::process::id(),
        SystemTime::now()
            .duration_since(UNIX_EPOCH)
            .map_or(0, |duration| duration.as_nanos())
    ));
    let mut options = OpenOptions::new();
    options.create_new(true).write(true);
    #[cfg(unix)]
    options.mode(0o600);
    let mut file = options
        .open(&temp)
        .with_context(|| format!("failed to create {}", temp.display()))?;
    let write_result = (|| -> Result<()> {
        file.write_all(uri.as_bytes())?;
        file.write_all(b"\n")?;
        file.sync_all()?;
        drop(file);
        fs::rename(&temp, path)
            .with_context(|| format!("failed to replace pairing URI file {}", path.display()))?;
        Ok(())
    })();
    if write_result.is_err() {
        let _ = fs::remove_file(&temp);
    }
    write_result
}

#[cfg(any(target_os = "linux", test))]
pub(super) fn remove_pairing_uri(path: &Path) -> Result<()> {
    match fs::remove_file(path) {
        Ok(()) => Ok(()),
        Err(error) if error.kind() == std::io::ErrorKind::NotFound => Ok(()),
        Err(error) => Err(error)
            .with_context(|| format!("failed to remove pairing URI file {}", path.display())),
    }
}