INNER CODE UNIT · Rust

file_lock

kubie-org/kubie · src/ioutil.rs:64

pub fn file_lock<P, F, T>(path: P, scope: F) -> Result<T, anyhow::Error>
where
    P: AsRef<Path>,
    F: FnOnce() -> Result<T, anyhow::Error> + UnwindSafe,
{
    let path = path.as_ref();
    let file = OpenOptions::new()
        .append(true)
        .truncate(false)
        .read(true)
        .create(true)
        .open(path)
        .with_context(|| format!("Could not open lock file at {}", path.display()))?;

    file.lock_exclusive()
        .with_context(|| format!("Could not lock file at {}", path.display()))?;

    // Run the given closure, but catch any panics so we can unlock before resuming the panic.

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