From 49de2b0c1ae56d31d5c59dc42c292475f57d4344 Mon Sep 17 00:00:00 2001
From: Carlo Cabrera <30379873+carlocab@users.noreply.github.com>
Date: Thu, 11 Nov 2021 17:30:02 +0800
Subject: [PATCH] Check arch instead of the brand string

---
 Library/Homebrew/brew.sh               | 18 +++++++++++++-----
 Library/Homebrew/cmd/vendor-install.sh |  7 ++++---
 2 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/Library/Homebrew/brew.sh b/Library/Homebrew/brew.sh
index daa0874b3c..b12933979a 100644
--- a/Library/Homebrew/brew.sh
+++ b/Library/Homebrew/brew.sh
@@ -6,6 +6,7 @@
 # Doesn't need a default case because we don't support other OSs
 # shellcheck disable=SC2249
 HOMEBREW_PROCESSOR="$(uname -m)"
+HOMEBREW_PHYSICAL_PROCESSOR="${HOMEBREW_PROCESSOR}"
 HOMEBREW_SYSTEM="$(uname -s)"
 case "${HOMEBREW_SYSTEM}" in
   Darwin) HOMEBREW_MACOS="1" ;;
@@ -17,12 +18,19 @@ esac
 # same file under the native architecture
 # These variables are set from the user environment.
 # shellcheck disable=SC2154
-if [[ "${HOMEBREW_CHANGE_ARCH_TO_ARM}" == "1" ]] &&
-   [[ "${HOMEBREW_MACOS}" == "1" ]] &&
-   [[ "$(sysctl -n hw.optional.arm64 2>/dev/null)" == "1" ]] &&
-   [[ "$(sysctl -n sysctl.proc_translated 2>/dev/null)" == "1" ]]
+if [[ "${HOMEBREW_MACOS}" == "1" ]] &&
+   [[ "$(sysctl -n hw.optional.arm64 2>/dev/null)" == "1" ]]
 then
-  exec arch -arm64e "${HOMEBREW_BREW_FILE}" "$@"
+  # used in vendor-install.sh
+  # shellcheck disable=SC2034
+  HOMEBREW_PHYSICAL_PROCESSOR="arm64"
+  HOMEBREW_ROSETTA="$(sysctl -n sysctl.proc_translated)"
+
+  if [[ "${HOMEBREW_CHANGE_ARCH_TO_ARM}" == "1" ]] &&
+     [[ "${HOMEBREW_ROSETTA}" == "1" ]]
+  then
+    exec arch -arm64e "${HOMEBREW_BREW_FILE}" "$@"
+  fi
 fi
 
 # Where we store built products; a Cellar in HOMEBREW_PREFIX (often /usr/local
diff --git a/Library/Homebrew/cmd/vendor-install.sh b/Library/Homebrew/cmd/vendor-install.sh
index b406fe0b36..4c76f8e856 100644
--- a/Library/Homebrew/cmd/vendor-install.sh
+++ b/Library/Homebrew/cmd/vendor-install.sh
@@ -14,15 +14,16 @@ VENDOR_DIR="${HOMEBREW_LIBRARY}/Homebrew/vendor"
 # Built from https://github.com/Homebrew/homebrew-portable-ruby.
 if [[ -n "${HOMEBREW_MACOS}" ]]
 then
-  if [[ "$(sysctl -n machdep.cpu.brand_string)" != "Apple"* ]] ||
+  if [[ "${HOMEBREW_PHYSICAL_PROCESSOR}" == "x86_64" ]] ||
      # Handle the case where /usr/local/bin/brew is run under arm64.
      # It's a x86_64 installation there (we refuse to install arm64 binaries) so
      # use a x86_64 Portable Ruby.
-     [[ "${HOMEBREW_PROCESSOR}" == "arm64" && "${HOMEBREW_PREFIX}" == "/usr/local" ]]
+     [[ "${HOMEBREW_PHYSICAL_PROCESSOR}" == "arm64" && "${HOMEBREW_PREFIX}" == "/usr/local" ]]
   then
     ruby_FILENAME="portable-ruby-2.6.8.yosemite.bottle.tar.gz"
     ruby_SHA="0cb1cc7af109437fe0e020c9f3b7b95c3c709b140bde9f991ad2c1433496dd42"
-  else
+  elif [[ "${HOMEBREW_PHYSICAL_PROCESSOR}" == "arm64" ]]
+  then
     ruby_FILENAME="portable-ruby-2.6.8.arm64_big_sur.bottle.tar.gz"
     ruby_SHA="f2d5cab5a4dd49e5b3de780a3cd0a1f61642fea247d1c25aa40cd43f1be290b5"
   fi