virtx 0.1.2

Run tasks in disposable Linux VMs from your own code, with a filesystem you compose.
Documentation 
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//! One module per concrete filesystem interface, each binding it to the layer below.
//!
//! A binding only translates: decode the interface's arguments, call a shared operation,
//! encode the reply. It decides only the errno numbering its consumer expects (a guest kernel
//! is always Linux; the host's is the host's) and the attribute type it fills.
//!
//! Each binding exports a guard whose `try_new` mounts, `join` waits for the mount to end, and
//! `Drop` takes it down, plus its mount options; vtables, callbacks and session handles stay
//! private.

#[cfg(all(feature = "mount", windows))]
mod dokan;
#[cfg(all(feature = "mount", unix, not(target_os = "macos")))]
mod fuse;
#[cfg(all(feature = "mount", target_os = "macos"))]
mod fuse_t;

// `self::` because a bare `dokan::` in a `use` names the crate, not this module.
// Re-exported so callers need no direct dependency on `dokan`.
#[cfg(all(feature = "mount", windows))]
pub use ::dokan::MountFlags;
#[cfg(all(feature = "mount", unix, not(target_os = "macos")))]
pub use fuse::FuseMount;
#[cfg(all(feature = "mount", target_os = "macos"))]
pub use fuse_t::{FuseTBackend, FuseTMount};
// Re-exported so callers need no direct dependency on `fuser`.
#[cfg(all(feature = "mount", unix, not(target_os = "macos")))]
pub use fuser::MountOption;

#[cfg(all(feature = "mount", windows))]
pub use self::dokan::DokanMount;

/// Drive an async [`Posix`](crate::fs::Posix) operation to completion from a binding's
/// *synchronous* callback.
///
/// Bindings are called on their own threads (never a Tokio worker) while the stores are
/// async, so they block here rather than each store embedding a runtime.
///
/// One lazily created runtime serves every mount and is **never dropped**: a `Runtime`'s
/// `Drop` blocks, which would panic on the binding threads that reach this.
#[cfg(all(feature = "mount", any(unix, windows)))]
pub(crate) fn block_on<F: std::future::Future>(fut: F) -> F::Output {
    use std::sync::OnceLock;
    static RT: OnceLock<tokio::runtime::Runtime> = OnceLock::new();
    RT.get_or_init(|| {
        tokio::runtime::Builder::new_multi_thread()
            .enable_all()
            .build()
            .expect("build virtx binding runtime")
    })
    .block_on(fut)
}