krata: rework into daemon / controller structure

guest/bin/init.rs

@@ -0,0 +1,24 @@
+use anyhow::{anyhow, Result};
+use env_logger::Env;
+use krataguest::init::GuestInit;
+use std::env;
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    env::set_var("RUST_BACKTRACE", "1");
+    env_logger::Builder::from_env(Env::default().default_filter_or("warn")).init();
+    if env::var("KRATA_UNSAFE_ALWAYS_ALLOW_INIT").unwrap_or("0".to_string()) != "1" {
+        let pid = std::process::id();
+        if pid > 3 {
+            return Err(anyhow!(
+                "not running because the pid of {} indicates this is probably not \
+                    the right context for the init daemon. \
+                        run with KRATA_UNSAFE_ALWAYS_ALLOW_INIT=1 to bypass this check",
+                pid
+            ));
+        }
+    }
+    let mut guest = GuestInit::new();
+    guest.init().await?;
+    Ok(())
+}