From ebb71682ab79616466b748f9e1da5ee25e743e94 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 25 Jul 2025 09:39:19 +0100
Subject: [PATCH] Improve error message for tap conflicts in brew install

Co-authored-by: MikeMcQuaid <125011+MikeMcQuaid@users.noreply.github.com>
Co-authored-by: carlocab <30379873+carlocab@users.noreply.github.com>
---
 Library/Homebrew/install.rb | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/Library/Homebrew/install.rb b/Library/Homebrew/install.rb
index fc20c85800..62e4a8f78c 100644
--- a/Library/Homebrew/install.rb
+++ b/Library/Homebrew/install.rb
@@ -102,6 +102,24 @@ module Homebrew
         end
         prefix_installed = formula.prefix.exist? && !formula.prefix.children.empty?
 
+        # Check if the installed formula is from a different tap
+        if formula.any_version_installed? &&
+           (current_tap_name = formula.tap&.name.presence) &&
+           (installed_keg_tab = formula.any_installed_keg&.tab.presence) &&
+           (installed_tap_name = installed_keg_tab.tap&.name.presence) &&
+           installed_tap_name != current_tap_name
+          odie <<~EOS
+            #{formula.name} was installed from the #{Formatter.identifier(installed_tap_name)} tap
+            but you are trying to install it from the #{Formatter.identifier(current_tap_name)} tap.
+            Formulae with the same name from different taps cannot be installed at the same time.
+
+            To install this version, you must first uninstall the existing formula:
+              brew uninstall #{formula.name}
+            Then you can install the desired version:
+              brew install #{formula.full_name}
+          EOS
+        end
+
         if formula.keg_only? && formula.any_version_installed? && formula.optlinked? && !force
           # keg-only install is only possible when no other version is
           # linked to opt, because installing without any warnings can break