From 59ea1189915f5c1207832448d17ed7bc5e282243 Mon Sep 17 00:00:00 2001
From: Mike McQuaid <mike@mikemcquaid.com>
Date: Fri, 4 Aug 2023 08:30:37 +0100
Subject: [PATCH] bin/brew: handle missing `$HOME`.

Try to build it using `$USER` or `$LOGNAME` and, if both are missing,
just give up.
---
 bin/brew | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/bin/brew b/bin/brew
index 60d67b29d88e9..ea08128845ff2 100755
--- a/bin/brew
+++ b/bin/brew
@@ -105,9 +105,30 @@ fi
 if [[ -n "${XDG_CONFIG_HOME-}" ]]
 then
   HOMEBREW_USER_CONFIG_HOME="${XDG_CONFIG_HOME}/homebrew"
-else
+elif [[ -n "${HOME-}" ]]
+then
   HOMEBREW_USER_CONFIG_HOME="${HOME}/.homebrew"
+elif [[ -n "${USER-}" ]]
+then
+  if [[ "${OSTYPE}" == "darwin"* ]]
+  then
+    HOMEBREW_USER_CONFIG_HOME="/Users/${USER}/.homebrew"
+  else
+    HOMEBREW_USER_CONFIG_HOME="/home/${USER}/.homebrew"
+  fi
+elif [[ -n "${LOGNAME-}" ]]
+then
+  if [[ "${OSTYPE}" == "darwin"* ]]
+  then
+    HOMEBREW_USER_CONFIG_HOME="/Users/${LOGNAME}/.homebrew"
+  else
+    HOMEBREW_USER_CONFIG_HOME="/home/${LOGNAME}/.homebrew"
+  fi
+else
+  echo "Error: \$HOME or \$USER or \$LOGNAME must be set to run brew." >&2
+  exit 1
 fi
+
 if [[ -f "${HOMEBREW_USER_CONFIG_HOME}/brew.env" ]]
 then
   # only load HOMEBREW_*=* lines