From 9446eb661d46a761931275d26f553ff9d0313f90 Mon Sep 17 00:00:00 2001
From: Mike McQuaid <mike@mikemcquaid.com>
Date: Tue, 27 Feb 2018 11:52:47 +0000
Subject: [PATCH] brew.sh: HOMEBREW_DEVELOPERs can enable Ruby warnings.

It provides some useful helpers for when we're doing stupid things but
it's not something we want around by default.
---
 Library/Homebrew/brew.sh | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/Library/Homebrew/brew.sh b/Library/Homebrew/brew.sh
index 77a60dfc7f..590dde3632 100644
--- a/Library/Homebrew/brew.sh
+++ b/Library/Homebrew/brew.sh
@@ -253,6 +253,14 @@ then
   then
     export HOMEBREW_DEV_CMD_RUN="1"
   fi
+
+  # Don't allow non-developers to customise Ruby warnings.
+  unset HOMEBREW_RUBY_WARNINGS
+fi
+
+if [[ -z "$HOMEBREW_RUBY_WARNINGS" ]]
+then
+  export HOMEBREW_RUBY_WARNINGS="-W0"
 fi
 
 if [[ -f "$HOMEBREW_LIBRARY/Homebrew/cmd/$HOMEBREW_COMMAND.sh" ]]
@@ -371,5 +379,5 @@ else
 
   # Unshift command back into argument list (unless argument list was empty).
   [[ "$HOMEBREW_ARG_COUNT" -gt 0 ]] && set -- "$HOMEBREW_COMMAND" "$@"
-  { update-preinstall; exec "$HOMEBREW_RUBY_PATH" -W0 "$HOMEBREW_LIBRARY/Homebrew/brew.rb" "$@"; }
+  { update-preinstall; exec "$HOMEBREW_RUBY_PATH" $HOMEBREW_RUBY_WARNINGS "$HOMEBREW_LIBRARY/Homebrew/brew.rb" "$@"; }
 fi