From d830e17a126a5ea4b77d5f0771eeafbf8ed2b5e7 Mon Sep 17 00:00:00 2001
From: Max Howell
Date: Wed, 7 Mar 2012 12:51:02 +0000
Subject: Protect against unwritable cache location

---
 Library/Homebrew/global.rb | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

(limited to 'Library/Homebrew')

diff --git a/Library/Homebrew/global.rb b/Library/Homebrew/global.rb
index 3f742db5c..b1e722b8b 100644
--- a/Library/Homebrew/global.rb
+++ b/Library/Homebrew/global.rb
@@ -9,16 +9,27 @@ ARGV.extend(HomebrewArgvExtension)
 HOMEBREW_VERSION = '0.8.1'
 HOMEBREW_WWW = 'http://mxcl.github.com/homebrew/'
 
-HOMEBREW_CACHE = if ENV['HOMEBREW_CACHE']
-  Pathname.new(ENV['HOMEBREW_CACHE'])
-elsif Process.uid == 0
-  # technically this is not the correct place, this cache is for *all users*
-  # so in that case, maybe we should always use it, root or not?
-  Pathname.new("/Library/Caches/Homebrew")
-else
-  Pathname.new("~/Library/Caches/Homebrew").expand_path
+def cache
+  if ENV['HOMEBREW_CACHE']
+    Pathname.new(ENV['HOMEBREW_CACHE'])
+  else
+    root_library = Pathname.new("/Library/Caches/Homebrew")
+    if Process.uid == 0
+      root_library
+    else
+      home_library = Pathname.new("~/Library/Caches/Homebrew").expand_path
+      if not home_library.writable?
+        root_library
+      else
+        home_library
+      end
+    end
+  end
 end
 
+HOMEBREW_CACHE = cache
+undef cache
+
 # Where brews installed via URL are cached
 HOMEBREW_CACHE_FORMULA = HOMEBREW_CACHE+"Formula"
 
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