From 396e4517803171df42274fabf956bc16c0c4ef05 Mon Sep 17 00:00:00 2001
From: Steve Sanderson <SteveSandersonMS@users.noreply.github.com>
Date: Mon, 16 Feb 2026 16:18:27 +0000
Subject: [PATCH] Fix maccatalyst RID detection in SDK targets

The OS detection logic falls through to 'linux' for maccatalyst-* RIDs
since they don't start with 'win' or 'osx'. Add explicit handling for
the 'maccatalyst' prefix to map it to 'osx', so the correct Darwin CLI
binary is downloaded.

Relates to #454

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 dotnet/src/build/GitHub.Copilot.SDK.targets | 1 +
 1 file changed, 1 insertion(+)

diff --git a/dotnet/src/build/GitHub.Copilot.SDK.targets b/dotnet/src/build/GitHub.Copilot.SDK.targets
index 35b017662..d5eeb4ec9 100644
--- a/dotnet/src/build/GitHub.Copilot.SDK.targets
+++ b/dotnet/src/build/GitHub.Copilot.SDK.targets
@@ -8,6 +8,7 @@
     <!-- Determine OS: from RID prefix if set, otherwise from build host -->
     <_CopilotOs Condition="'$(RuntimeIdentifier)' != '' And $(RuntimeIdentifier.StartsWith('win'))">win</_CopilotOs>
     <_CopilotOs Condition="'$(_CopilotOs)' == '' And '$(RuntimeIdentifier)' != '' And $(RuntimeIdentifier.StartsWith('osx'))">osx</_CopilotOs>
+    <_CopilotOs Condition="'$(_CopilotOs)' == '' And '$(RuntimeIdentifier)' != '' And $(RuntimeIdentifier.StartsWith('maccatalyst'))">osx</_CopilotOs>
     <_CopilotOs Condition="'$(_CopilotOs)' == '' And '$(RuntimeIdentifier)' != ''">linux</_CopilotOs>
 
     <!-- Determine arch: from RID suffix if set, otherwise from build host -->