From 7c9053753fb9631ec5ff94b76db8626e6a6bdd39 Mon Sep 17 00:00:00 2001
From: Bo Anderson <mail@boanderson.me>
Date: Fri, 16 Apr 2021 12:17:50 +0100
Subject: [PATCH] brew.sh: add workaround for old auto-updates

---
 Library/Homebrew/brew.sh | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Library/Homebrew/brew.sh b/Library/Homebrew/brew.sh
index 49faaeeacc..d6f98815ba 100644
--- a/Library/Homebrew/brew.sh
+++ b/Library/Homebrew/brew.sh
@@ -442,6 +442,17 @@ Your Git executable: $(unset git && type -p $HOMEBREW_GIT)"
   unset HOMEBREW_MACOS_SYSTEM_RUBY_NEW_ENOUGH
 fi
 
+# A bug in the auto-update process prior to 3.1.2 means $HOMEBREW_BOTTLE_DOMAIN
+# could be passed down with the default domain.
+# This is problematic as this is will be the old bottle domain.
+# This workaround is necessary for many CI images starting on old version,
+# and will only be unnecessary when updating from <3.1.2 is not a concern.
+# That will be when macOS 12 is the minimum required version.
+if [[ -n "$HOMEBREW_BOTTLE_DEFAULT_DOMAIN" && "$HOMEBREW_BOTTLE_DOMAIN" = "$HOMEBREW_BOTTLE_DEFAULT_DOMAIN" ]]
+then
+  unset HOMEBREW_BOTTLE_DOMAIN
+fi
+
 if [[ -n "$HOMEBREW_MACOS" || -n "$HOMEBREW_FORCE_HOMEBREW_ON_LINUX" ]]
 then
   HOMEBREW_BOTTLE_DEFAULT_DOMAIN="https://ghcr.io/v2/homebrew/core"