Don't blacklist tapped-dupes

If a formula is in Formula due to tapping or otherwise, don't prohibit installation.

Really we should make the blacklist *really* stuff that should be blacklisted and then if it is available still require a --force. But currently with okay stuff like vim in there, and libxml2 being both blacklisted *and* in mxcl/master, we are screwing ourselves.

TL;DR we should do some work on this component.

Fixes #13234.

1 files changed, 5 insertions, 2 deletions

diff --git a/Library/Homebrew/cmd/install.rb b/Library/Homebrew/cmd/install.rb
index 8a6c78bb4..2d2d2903a 100644
--- a/Library/Homebrew/cmd/install.rb
+++ b/Library/Homebrew/cmd/install.rb
@@ -7,8 +7,11 @@ module Homebrew extend self
     raise FormulaUnspecifiedError if ARGV.named.empty?
 
     ARGV.named.each do |name|
-      msg = blacklisted? name
-      raise "No available formula for #{name}\n#{msg}" if msg
+      # if a formula has been tapped ignore the blacklisting
+      if not File.file? HOMEBREW_REPOSITORY/"Library/Formula/#{name}.rb"
+        msg = blacklisted? name
+        raise "No available formula for #{name}\n#{msg}" if msg
+      end
     end unless ARGV.force?
 
     if Process.uid.zero? and not File.stat(HOMEBREW_BREW_FILE).uid.zero?