From 3bd4349e8ebfd44ce99beea90a8244ed8da33e8a Mon Sep 17 00:00:00 2001
From: Markus Reiter
Date: Mon, 6 Mar 2017 21:28:34 +0100
Subject: Migrate legacy Caskroom.

---
 Library/Homebrew/compat/hbc.rb          |  2 ++
 Library/Homebrew/compat/hbc/caskroom.rb | 25 +++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

(limited to 'Library/Homebrew/compat')

diff --git a/Library/Homebrew/compat/hbc.rb b/Library/Homebrew/compat/hbc.rb
index e60bdbc07..353a72488 100644
--- a/Library/Homebrew/compat/hbc.rb
+++ b/Library/Homebrew/compat/hbc.rb
@@ -9,7 +9,9 @@ module Hbc
       Module.new do
         def init
           Cache.delete_legacy_cache
+
           Caskroom.migrate_caskroom_from_repo_to_prefix
+          Caskroom.migrate_legacy_caskroom
 
           super
         end
diff --git a/Library/Homebrew/compat/hbc/caskroom.rb b/Library/Homebrew/compat/hbc/caskroom.rb
index 489c5b224..3621a35fb 100644
--- a/Library/Homebrew/compat/hbc/caskroom.rb
+++ b/Library/Homebrew/compat/hbc/caskroom.rb
@@ -2,6 +2,31 @@ module Hbc
   module Caskroom
     module_function
 
+    def migrate_legacy_caskroom
+      return if Hbc.caskroom.exist?
+
+      legacy_caskroom = Pathname.new("/opt/homebrew-cask/Caskroom")
+      return if Hbc.caskroom == legacy_caskroom
+      return unless legacy_caskroom.exist?
+      return if legacy_caskroom.symlink?
+
+      ohai "Migrating Caskroom from #{legacy_caskroom} to #{Hbc.caskroom}."
+      if Hbc.caskroom.parent.writable?
+        FileUtils.mv legacy_caskroom, Hbc.caskroom
+      else
+        opoo "#{Hbc.caskroom.parent} is not writable, sudo is needed to move the Caskroom."
+        SystemCommand.run("/bin/mv", args: [legacy_caskroom, Hbc.caskroom.parent], sudo: true)
+      end
+
+      ohai "Creating symlink from #{Hbc.caskroom} to #{legacy_caskroom}."
+      if legacy_caskroom.parent.writable?
+        FileUtils.ln_s Hbc.caskroom, legacy_caskroom
+      else
+        opoo "#{legacy_caskroom.parent} is not writable, sudo is needed to link the Caskroom."
+        SystemCommand.run("/bin/ln", args: ["-s", Hbc.caskroom, legacy_caskroom], sudo: true)
+      end
+    end
+
     def migrate_caskroom_from_repo_to_prefix
       repo_caskroom = HOMEBREW_REPOSITORY.join("Caskroom")
       return if Hbc.caskroom.exist?
-- 
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