Merge pull request #13289 from Homebrew/handle_broken_casks

Fix handling unreadable casks

Library/Homebrew/cask/caskroom.rb

@@ -46,14 +46,19 @@ module Cask
       path.children.select(&:directory?).sort.map do |path|
         token = path.basename.to_s
 
-        if (tap_path = CaskLoader.tap_paths(token).first)
-          CaskLoader::FromTapPathLoader.new(tap_path).load(config: config)
-        elsif (caskroom_path = Pathname.glob(path.join(".metadata/*/*/*/*.rb")).first)
-          CaskLoader::FromPathLoader.new(caskroom_path).load(config: config)
-        else
-          CaskLoader.load(token, config: config)
+        begin
+          if (tap_path = CaskLoader.tap_paths(token).first)
+            CaskLoader::FromTapPathLoader.new(tap_path).load(config: config)
+          elsif (caskroom_path = Pathname.glob(path.join(".metadata/*/*/*/*.rb")).first)
+            CaskLoader::FromPathLoader.new(caskroom_path).load(config: config)
+          else
+            CaskLoader.load(token, config: config)
+          end
+        rescue CaskUnavailableError
+          # Don't blow up because of a single unavailable cask.
+          nil
         end
-      end
+      end.compact
     end
   end
 end

Library/Homebrew/cask/cmd/uninstall.rb

@@ -39,14 +39,7 @@ module Cask
         casks.each do |cask|
           odebug "Uninstalling Cask #{cask}"
 
-          if cask.installed?
-            if (installed_caskfile = cask.installed_caskfile) && installed_caskfile.exist?
-              # Use the same cask file that was used for installation, if possible.
-              cask = CaskLoader.load(installed_caskfile)
-            end
-          else
-            raise CaskNotInstalledError, cask unless force
-          end
+          raise CaskNotInstalledError, cask if !cask.installed? && !force
 
           Installer.new(cask, **options).uninstall
 

Library/Homebrew/cask/cmd/zap.rb

@@ -32,14 +32,7 @@ module Cask
         casks.each do |cask|
           odebug "Zapping Cask #{cask}"
 
-          if cask.installed?
-            if (installed_caskfile = cask.installed_caskfile) && installed_caskfile.exist?
-              # Use the same cask file that was used for installation, if possible.
-              cask = CaskLoader.load(installed_caskfile)
-            end
-          else
-            raise CaskNotInstalledError, cask unless force
-          end
+          raise CaskNotInstalledError, cask if !cask.installed? && !force
 
           Installer.new(cask, verbose: verbose, force: force).zap
         end

Library/Homebrew/cli/named_args.rb

@@ -148,6 +148,16 @@ module Homebrew
 
             return cask
           rescue Cask::CaskUnreadableError => e
+            # If we're trying to get a keg-like Cask, do our best to handle it
+            # not being readable and return something that can be used.
+            if [:latest_kegs, :default_kegs, :kegs].include?(method)
+              cask_version = Cask::Cask.new(name, config: config).versions.first
+              cask = Cask::Cask.new(name, config: config) do
+                version cask_version if cask_version
+              end
+              return cask
+            end
+
             # Need to rescue before `CaskUnavailableError` (superclass of this)
             # The cask was found, but there's a problem with its implementation
             unreadable_error ||= e