From 555dbfc9fa1ec9f1050086b892fe9d5da049f7a0 Mon Sep 17 00:00:00 2001
From: Dmitry Kovba <dkovba@apple.com>
Date: Fri, 13 Jun 2025 19:48:59 -0700
Subject: [PATCH] Adds a warning when running a debug build (#201)

This PR adds a warning that the performance may be degraded when running
a debug build.

Debug build:
```
% bin/container run -it --rm alpine:latest date
Warning! Running debug build. Performance may be degraded.
Fri Jun 13 18:10:35 PDT 2025
```

Release build:
```
% bin/container run -it --rm alpine:latest date
Fri Jun 13 18:10:35 PDT 2025
```
---
 Sources/CLI/Application.swift | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Sources/CLI/Application.swift b/Sources/CLI/Application.swift
index 3d029bcf..3631de5a 100644
--- a/Sources/CLI/Application.swift
+++ b/Sources/CLI/Application.swift
@@ -150,6 +150,13 @@ struct Application: AsyncParsableCommand {
     public static func main() async throws {
         restoreCursorAtExit()
 
+        #if DEBUG
+        let warning = "Running debug build. Performance may be degraded."
+        let formattedWarning = "\u{001B}[33mWarning!\u{001B}[0m \(warning)\n"
+        let warningData = Data(formattedWarning.utf8)
+        FileHandle.standardError.write(warningData)
+        #endif
+
         let fullArgs = CommandLine.arguments
         let args = Array(fullArgs.dropFirst())