From 745ec8f7c942ea5e2a6cb3eaaa0c5f8d5cf98f1f Mon Sep 17 00:00:00 2001
From: Alex Dunn
Date: Mon, 9 Nov 2015 07:30:02 -0800
Subject: cmd/update: check before tapping

Follow-up to ea6c8f7e2dc8f1adf8df9065468d0b37047d4a46
---
 Library/Homebrew/cmd/update.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'Library')

diff --git a/Library/Homebrew/cmd/update.rb b/Library/Homebrew/cmd/update.rb
index 70d381250..504d4115b 100644
--- a/Library/Homebrew/cmd/update.rb
+++ b/Library/Homebrew/cmd/update.rb
@@ -83,7 +83,8 @@ module Homebrew
       migration = TAP_MIGRATIONS[f]
       next unless migration
       tap = Tap.fetch(*migration.split("/"))
-      tap.install
+      tap.install unless tap.installed?
+
       # update tap for each Tab
       tabs = dir.subdirs.map { |d| Tab.for_keg(Keg.new(d)) }
       next if tabs.first.source["tap"] != "Homebrew/homebrew"
-- 
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