tools: add tokio::main() replacement

to deal with block_on() not allowing blocking()

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

src/tools/runtime.rs

@@ -0,0 +1,20 @@
+//! Helpers for quirks of the current tokio runtime.
+
+use std::future::Future;
+
+pub fn main<F, T>(fut: F) -> T
+where
+    F: Future<Output = T> + Send + 'static,
+    T: std::fmt::Debug + Send + 'static,
+{
+    let rt = tokio::runtime::Runtime::new().unwrap();
+    rt.block_on(async {
+        let (tx, rx) = tokio::sync::oneshot::channel();
+
+        tokio::spawn(async move {
+            tx.send(fut.await).unwrap()
+        });
+
+        rx.await.unwrap()
+    })
+}