huskies: merge 1147 story One-active-gateway invariant via pidfile+flock — prevent double-gateway during restarts

2026-05-19 18:34:41 +00:00
parent 918f18c200
commit be7bdf8304
4 changed files with 136 additions and 1 deletions
@@ -163,7 +163,10 @@ pub async fn execute_trampoline_core(job: &TrampolineJob) -> Result<(), String>
    }
    let _ = std::fs::copy(&job.old_binary_path, &job.backup_binary_path);

-    // Kill old gateway.
+    // Kill old gateway.  Killing the process closes its file descriptors,
+    // which releases the exclusive flock held on `$HOME/.huskies/gateway.pid`.
+    // The new gateway (spawned below) will then acquire that flock on startup,
+    // ensuring the one-active-gateway invariant is maintained across the swap.
    kill_gateway_process(job.gateway_pid)?;

    // Start new gateway.