From 0e4b28ac25adb8d1d40bc54708e6af2e5e4c4ed5 Mon Sep 17 00:00:00 2001
From: Peter Steinberger <steipete@gmail.com>
Date: Mon, 8 Dec 2025 22:53:40 +0100
Subject: [PATCH] macos: fail fast when SSH tunnel exits

---
 apps/macos/Sources/Clawdis/ControlChannel.swift | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/apps/macos/Sources/Clawdis/ControlChannel.swift b/apps/macos/Sources/Clawdis/ControlChannel.swift
index f538c4feb..e33928647 100644
--- a/apps/macos/Sources/Clawdis/ControlChannel.swift
+++ b/apps/macos/Sources/Clawdis/ControlChannel.swift
@@ -267,9 +267,17 @@ final class ControlChannel: ObservableObject {
         }
         proc.arguments = args
         proc.standardInput = nil
-        proc.standardOutput = Pipe()
-        proc.standardError = Pipe()
+        let outPipe = Pipe()
+        let errPipe = Pipe()
+        proc.standardOutput = outPipe
+        proc.standardError = errPipe
         try proc.run()
+        // Give ssh a brief moment; if it exits immediately, surface the error.
+        try? Task.sleep(nanoseconds: 200_000_000) // 200ms
+        if !proc.isRunning {
+            let err = String(data: errPipe.fileHandleForReading.readDataToEndOfFile(), encoding: .utf8)?.trimmingCharacters(in: .whitespacesAndNewlines)
+            throw ControlChannelError.sshFailed(err ?? "ssh exited")
+        }
         self.sshProcess = proc
         return localPort
     }