bump deps, rust, alpine, and add the real iproute2

src/cmd/init.rs

@@ -1,6 +1,7 @@
 use eyre::{format_err, Result};
 use log::{error, info, warn};
 use std::collections::BTreeSet as Set;
+use std::convert::Infallible;
 use std::os::unix::fs::symlink;
 use tokio::sync::Mutex;
 use tokio::{fs, process::Command};
@@ -323,13 +324,7 @@ async fn child_reaper() {
     }
 }
 
-macro_rules! cstr {
-    ($s:expr) => {
-        std::ffi::CString::new($s)?.as_c_str()
-    };
-}
-
-async fn switch_root(root: &str) -> Result<()> {
+async fn switch_root(root: &str) -> Result<Infallible> {
     info!("killing all processes and switching root");
     dklog::LOG.close().await;
 
@@ -340,7 +335,13 @@ async fn switch_root(root: &str) -> Result<()> {
         eprintln!("failed to kill processes: {e}");
     }
 
-    nix::unistd::execv(
+    macro_rules! cstr {
+        ($s:expr) => {
+            std::ffi::CString::new($s)?.as_c_str()
+        };
+    }
+
+    Ok(nix::unistd::execv(
         cstr!("/sbin/switch_root"),
         &[
             cstr!("switch_root"),
@@ -349,8 +350,5 @@ async fn switch_root(root: &str) -> Result<()> {
             cstr!(root),
             cstr!("/sbin/init"),
         ],
-    )
-    .unwrap();
-
-    unreachable!();
+    )?)
 }