ic-host-fs 0.17.3

//! Private filesystem fixtures.
use std::{
    fs,
    path::PathBuf,
    sync::atomic::{AtomicU64, Ordering},
};
static SEQUENCE: AtomicU64 = AtomicU64::new(0);
pub struct Fixture {
    pub root: PathBuf,
}
impl Fixture {
    pub fn new() -> Self {
        let root = loop {
            let candidate = std::env::temp_dir().join(format!(
                "ic-host-fs-test-{}-{}",
                std::process::id(),
                SEQUENCE.fetch_add(1, Ordering::Relaxed)
            ));
            match fs::create_dir(&candidate) {
                Ok(()) => break candidate,
                Err(error) if error.kind() == std::io::ErrorKind::AlreadyExists => {}
                Err(error) => panic!("cannot create fixture {}: {error}", candidate.display()),
            }
        };
        Self {
            root: root.canonicalize().unwrap(),
        }
    }
}
impl Drop for Fixture {
    fn drop(&mut self) {
        if std::thread::panicking() {
            eprintln!(
                "Failed filesystem fixture retained: {}",
                self.root.display()
            );
            return;
        }
        let _ = fs::remove_dir_all(&self.root);
    }
}