Move legacy cache and caskroom code to compat/*.

Library/Homebrew/cask/lib/hbc.rb

@@ -45,9 +45,6 @@ module Hbc
 
   def self.init
     Cache.ensure_cache_exists
-    Cache.delete_legacy_cache
-
-    Caskroom.migrate_caskroom_from_repo_to_prefix
     Caskroom.ensure_caskroom_exists
   end
 

Library/Homebrew/cask/lib/hbc/cache.rb

@@ -8,13 +8,5 @@ module Hbc
       odebug "Creating Cache at #{Hbc.cache}"
       Hbc.cache.mkpath
     end
-
-    def delete_legacy_cache
-      legacy_cache = HOMEBREW_CACHE.join("Casks")
-      return unless legacy_cache.exist?
-
-      ohai "Deleting legacy cache at #{legacy_cache}..."
-      FileUtils.remove_entry_secure(legacy_cache)
-    end
   end
 end

Library/Homebrew/cask/lib/hbc/caskroom.rb

@@ -2,21 +2,6 @@ module Hbc
   module Caskroom
     module_function
 
-    def migrate_caskroom_from_repo_to_prefix
-      repo_caskroom = HOMEBREW_REPOSITORY.join("Caskroom")
-      return if Hbc.caskroom.exist?
-      return unless repo_caskroom.directory?
-
-      ohai "Moving Caskroom from HOMEBREW_REPOSITORY to HOMEBREW_PREFIX"
-
-      if Hbc.caskroom.parent.writable?
-        FileUtils.mv repo_caskroom, Hbc.caskroom
-      else
-        opoo "#{Hbc.caskroom.parent} is not writable, sudo is needed to move the Caskroom."
-        SystemCommand.run("/bin/mv", args: [repo_caskroom, Hbc.caskroom.parent], sudo: true)
-      end
-    end
-
     def ensure_caskroom_exists
       return if Hbc.caskroom.exist?
 

Library/Homebrew/compat/hbc.rb

@@ -1,2 +1,19 @@
 require "compat/hbc/cask_loader"
 require "compat/hbc/cli/update"
+require "compat/hbc/cache"
+require "compat/hbc/caskroom"
+
+module Hbc
+  class << self
+    prepend(
+      Module.new do
+        def init
+          Cache.delete_legacy_cache
+          Caskroom.migrate_caskroom_from_repo_to_prefix
+
+          super
+        end
+      end,
+    )
+  end
+end

Library/Homebrew/compat/hbc/cache.rb

@@ -0,0 +1,13 @@
+module Hbc
+  module Cache
+    module_function
+
+    def delete_legacy_cache
+      legacy_cache = HOMEBREW_CACHE.join("Casks")
+      return unless legacy_cache.exist?
+
+      ohai "Deleting legacy cache at #{legacy_cache}"
+      FileUtils.remove_entry_secure(legacy_cache)
+    end
+  end
+end

Library/Homebrew/compat/hbc/caskroom.rb

@@ -0,0 +1,20 @@
+module Hbc
+  module Caskroom
+    module_function
+
+    def migrate_caskroom_from_repo_to_prefix
+      repo_caskroom = HOMEBREW_REPOSITORY.join("Caskroom")
+      return if Hbc.caskroom.exist?
+      return unless repo_caskroom.directory?
+
+      ohai "Moving Caskroom from HOMEBREW_REPOSITORY to HOMEBREW_PREFIX"
+
+      if Hbc.caskroom.parent.writable?
+        FileUtils.mv repo_caskroom, Hbc.caskroom
+      else
+        opoo "#{Hbc.caskroom.parent} is not writable, sudo is needed to move the Caskroom."
+        SystemCommand.run("/bin/mv", args: [repo_caskroom, Hbc.caskroom.parent], sudo: true)
+      end
+    end
+  end
+end