Merge pull request #4229 from reitermarkus/fix-cask-tap-not-available

Fix tap unavailable error for migrated Cask taps.

Library/Homebrew/compat/tap.rb

@@ -13,11 +13,13 @@ class Tap
 
       old_name = name
       old_path = path
-      old_remote = remote
+      old_remote = path.git_origin
 
       clear_cache
       super(new_user, new_repo)
 
+      return unless old_path.directory?
+
       new_initial_revision_var = "HOMEBREW_UPDATE_BEFORE#{repo_var}"
       new_current_revision_var = "HOMEBREW_UPDATE_AFTER#{repo_var}"
 
@@ -30,14 +32,14 @@ class Tap
 
       ohai "Migrating tap #{old_name} to #{new_name}..." if $stdout.tty?
 
+      if old_path.git?
+        puts "Changing remote from #{old_remote} to #{new_remote}..." if $stdout.tty?
+        old_path.git_origin = new_remote
+      end
+
       puts "Moving #{old_path} to #{new_path}..." if $stdout.tty?
       path.dirname.mkpath
       FileUtils.mv old_path, new_path
-
-      return unless old_path.git?
-
-      puts "Changing remote from #{old_remote} to #{new_remote}..." if $stdout.tty?
-      new_path.git_origin = new_remote
     end
   end