Include command information for process spawn errors

Summary: In order to facilitate debugging, include full command information in the error message of spawn. This at least will provide clear indication of which executable it attempted to run with all of its argments.

Reviewed By: mariusae, ahmadsharif1, vidhyav

Differential Revision: D76853418

fbshipit-source-id: 928c7e7d364dce36c979cbebbd1d9a94a2130937

Author: technicianted

hyperactor_mesh/src/alloc/process.rs

@@ -321,7 +321,7 @@ impl ProcessAlloc {
         match cmd.spawn() {
             Err(err) => {
                 // Likely retry won't help here so fail permanently.
-                let message = format!("spawn {}: {}", index, err);
+                let message = format!("spawn index: {}, command: {:?}: {}", index, cmd, err);
                 tracing::error!(message);
                 self.failed = true;
                 Some(ProcState::Failed {