From 6f91b429ceee780088b659e519e19262bcfd48cf Mon Sep 17 00:00:00 2001
From: Mike McQuaid
Date: Sun, 10 Jan 2016 19:35:16 +0000
Subject: Move some brew.rb logic to bin/brew.

---
 bin/brew | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 71 insertions(+), 1 deletion(-)

(limited to 'bin')

diff --git a/bin/brew b/bin/brew
index 5a4aef5fb..b0e38aba4 100755
--- a/bin/brew
+++ b/bin/brew
@@ -37,6 +37,19 @@ else
   HOMEBREW_CELLAR="$HOMEBREW_REPOSITORY/Cellar"
 fi
 
+case "$*" in
+  --prefix) echo "$HOMEBREW_PREFIX"; exit 0 ;;
+  --cellar) echo "$HOMEBREW_CELLAR"; exit 0 ;;
+  --repository|--repo) echo "$HOMEBREW_REPOSITORY"; exit 0 ;;
+esac
+
+if [ "$HOMEBREW_PREFIX" = "/" ] || [ "$HOMEBREW_PREFIX" = "/usr" ]
+then
+  # it may work, but I only see pain this route and don't want to support it
+  echo "Cowardly refusing to continue at this prefix: $HOMEBREW_PREFIX" >&2
+  exit 1
+fi
+
 # Users may have these set, pointing the system Ruby
 # at non-system gem paths
 unset GEM_HOME
@@ -47,9 +60,14 @@ then
   unset HOMEBREW_RUBY_PATH
 fi
 
+if [ "$(uname -s)" = "Darwin" ]
+then
+  HOMEBREW_OSX="1"
+fi
+
 if [ -z "$HOMEBREW_RUBY_PATH" ]
 then
-  if [ "$(uname -s)" = "Darwin" ]
+  if [ -n "$HOMEBREW_OSX" ]
   then
     HOMEBREW_RUBY_PATH="/System/Library/Frameworks/Ruby.framework/Versions/Current/usr/bin/ruby"
   else
@@ -64,6 +82,42 @@ export HOMEBREW_REPOSITORY
 export HOMEBREW_LIBRARY
 export HOMEBREW_CELLAR
 
+if [ -n "$HOMEBREW_OSX" ]
+then
+  if [ "$('xcode-select' --print-path)" = "/" ]
+  then
+    cat >&2 <<EOS
+Your xcode-select path is currently set to '/'.
+This causes the 'xcrun' tool to hang, and can render Homebrew unusable.
+If you are using Xcode, you should:
+  sudo xcode-select -switch /Applications/Xcode.app
+Otherwise, you should:
+  sudo rm -rf /usr/share/xcode-select
+EOS
+    exit 1
+  fi
+
+  XCRUN_OUTPUT="$(/usr/bin/xcrun clang 2>&1)"
+  XCRUN_STATUS="$?"
+
+  if [ "$XCRUN_STATUS" -ne 0 ] && [[ "$XCRUN_OUTPUT" = *license* ]]
+  then
+    cat >&2 <<EOS
+You have not agreed to the Xcode license. Please resolve this by running:
+  sudo xcodebuild -license
+EOS
+    exit 1
+  fi
+fi
+
+# Many Pathname operations use getwd when they shouldn't, and then throw
+# odd exceptions. Reduce our support burden by showing a user-friendly error.
+if ! [ -d "$(pwd)" ]
+then
+  echo "The current working directory doesn't exist, cannot proceed." >&2
+  exit 1
+fi
+
 for i in "$@"
 do
   if [[ "$1" = -v ]]
@@ -72,10 +126,26 @@ do
     set -- "$@" -v
   fi
   [[ "$i" =~ ^- ]] && continue
+  HOMEBREW_COMMAND="$i"
   HOMEBREW_BASH_COMMAND="$HOMEBREW_LIBRARY/Homebrew/cmd/$i.sh"
   break
 done
 
+if [ "$(id -u)" = "0" ] && [ "$(stat -f%u "$HOMEBREW_BREW_FILE")" != "0" ]
+then
+  case "$HOMEBREW_COMMAND" in
+    install|reinstall|postinstall|link|pin|unpin|update|update-bash|upgrade|create|migrate|tap|switch)
+      cat >&2 <<EOS
+Cowardly refusing to 'sudo brew $HOMEBREW_COMMAND'
+You can use brew with sudo, but only if the brew executable is owned by root.
+However, this is both not recommended and completely unsupported so do so at
+your own risk.
+EOS
+      exit 1
+      ;;
+  esac
+fi
+
 if [ -n "$HOMEBREW_BASH_COMMAND" ] && [ -x "$HOMEBREW_BASH_COMMAND" ]
 then
   # source rather than executing directly to ensure the entire file is read into
-- 
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