From 76aa0a62f3ef3bbb31c2688037e3932b80aff7f9 Mon Sep 17 00:00:00 2001
From: Max Howell
Date: Wed, 7 Mar 2012 11:16:27 +0000
Subject: Stop supporting `brew install --force'

Rationale: it breaks stuff. You should not be able to install over something already installed *and* linked. brew now prompts you to unlink the existing linked keg first.

I came to fix this because I discovered that `brew install foo` works without --force provided foo's formula version is different to that which is installed and linked. I'm not sure if this was intentionally broken, but it led to at least two tickets I found where people were getting crazy issues trying to install over the top of already installed previous versions.

So I also fixed a whole category of other issues, mostly by moving error handling into FormulaInstaller. Now error's can be caught in Homebrew.install and handled on a formula-by-formula basis. I will next port this behaviour to upgrade.
---
 Library/Homebrew/exceptions.rb | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

(limited to 'Library/Homebrew/exceptions.rb')

diff --git a/Library/Homebrew/exceptions.rb b/Library/Homebrew/exceptions.rb
index 6db601fe1..df334582c 100644
--- a/Library/Homebrew/exceptions.rb
+++ b/Library/Homebrew/exceptions.rb
@@ -42,10 +42,7 @@ module Homebrew
   end
 end
 
-class FormulaAlreadyInstalledError < Homebrew::InstallationError
-  def message
-    "Formula already installed: #{formula}"
-  end
+class CannotInstallFormulaError < RuntimeError
 end
 
 class FormulaInstallationAlreadyAttemptedError < Homebrew::InstallationError
-- 
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