Set correct tap when loading installed casks

Library/Homebrew/cask/cask_loader.rb

@@ -503,13 +503,26 @@ module Cask
                 .returns(T.nilable(T.attached_class))
       }
       def self.try_new(ref, warn: false)
-        return unless ref.is_a?(String)
+        token = if ref.is_a?(String)
+          ref
+        elsif ref.is_a?(Pathname)
+          ref.basename(ref.extname).to_s
+        end
+        return unless token
 
-        possible_installed_cask = Cask.new(ref)
+        possible_installed_cask = Cask.new(token)
         return unless (installed_caskfile = possible_installed_cask.installed_caskfile)
 
         new(installed_caskfile)
       end
+
+      sig { params(path: T.any(Pathname, String), token: String).void }
+      def initialize(path, token: T.unsafe(nil))
+        super
+
+        installed_tap = Cask.new(@token).tab.tap
+        @tap = installed_tap if installed_tap
+      end
     end
 
     # Pseudo-loader which raises an error when trying to load the corresponding cask.
@@ -598,6 +611,32 @@ module Cask
       end
     end
 
+    sig { params(ref: String, config: T.nilable(Config), warn: T::Boolean).returns(Cask) }
+    def self.load_installed_cask(ref, config: nil, warn: true)
+      tap, token = Tap.with_cask_token(ref)
+      token ||= ref
+      tap ||= Cask.new(ref).tab.tap
+
+      if tap.nil?
+        self.load(token, config:, warn:)
+      else
+        begin
+          self.load("#{tap}/#{token}", config:, warn:)
+        rescue CaskUnavailableError
+          # cask may be migrated to different tap. Try to search in all taps.
+          self.load(token, config:, warn:)
+        end
+      end
+    end
+
+    sig { params(path: Pathname, config: T.nilable(Config), warn: T::Boolean).returns(Cask) }
+    def self.load_from_installed_caskfile(path, config: nil, warn: true)
+      loader = FromInstalledPathLoader.try_new(path, warn:)
+      loader ||= NullLoader.new(path)
+
+      loader.load(config:)
+    end
+
     def self.default_path(token)
       find_cask_in_tap(token.to_s.downcase, CoreCaskTap.instance)
     end

Library/Homebrew/cask/caskroom.rb

@@ -56,7 +56,7 @@ module Cask
     sig { params(config: T.nilable(Config)).returns(T::Array[Cask]) }
     def self.casks(config: nil)
       tokens.sort.filter_map do |token|
-        CaskLoader.load(token, config:, warn: false)
+        CaskLoader.load_installed_cask(token, config:, warn: false)
       rescue TapCaskAmbiguityError => e
         T.must(e.loaders.first).load(config:)
       rescue

Library/Homebrew/cli/named_args.rb

@@ -189,7 +189,18 @@ module Homebrew
               if want_keg_like_cask &&
                  (installed_caskfile = candidate_cask.installed_caskfile) &&
                  installed_caskfile.exist?
-                Cask::CaskLoader.load(installed_caskfile)
+                cask = Cask::CaskLoader.load_from_installed_caskfile(installed_caskfile)
+
+                requested_tap, requested_token = Tap.with_cask_token(name)
+                if requested_tap && requested_token
+                  installed_cask_tap = cask.tab.tap
+
+                  if installed_cask_tap && installed_cask_tap != requested_tap
+                    raise Cask::TapCaskUnavailableError.new(requested_tap, requested_token)
+                  end
+                end
+
+                cask
               else
                 candidate_cask
               end
@@ -405,6 +416,16 @@ module Homebrew
         rack = Formulary.to_rack(name.downcase)
 
         kegs = rack.directory? ? rack.subdirs.map { |d| Keg.new(d) } : []
+
+        requested_tap, requested_formula = Tap.with_formula_name(name)
+        if requested_tap && requested_formula
+          kegs = kegs.select do |keg|
+            keg.tab.tap == requested_tap
+          end
+
+          raise NoSuchKegFromTapError.new(requested_formula, requested_tap) if kegs.none?
+        end
+
         raise NoSuchKegError, name if kegs.none?
 
         [rack, kegs]

Library/Homebrew/exceptions.rb

@@ -61,6 +61,18 @@ class NoSuchKegError < RuntimeError
   end
 end
 
+# Raised when a keg from a specific tap doesn't exist.
+class NoSuchKegFromTapError < RuntimeError
+  attr_reader :name, :tap
+
+  sig { params(name: String, tap: Tap).void }
+  def initialize(name, tap)
+    @name = name
+    @tap = tap
+    super "No such keg: #{HOMEBREW_CELLAR}/#{name} from tap #{tap}"
+  end
+end
+
 # Raised when an invalid attribute is used in a formula.
 class FormulaValidationError < StandardError
   attr_reader :attr, :formula

Library/Homebrew/test/cask/cask_loader_spec.rb

@@ -184,4 +184,60 @@ RSpec.describe Cask::CaskLoader, :cask do
       end
     end
   end
+
+  describe "::load_installed_cask" do
+    let(:foo_tap) { Tap.fetch("user", "foo") }
+    let(:bar_tap) { Tap.fetch("user", "bar") }
+
+    let(:blank_tab) { instance_double(Cask::Tab, tap: nil) }
+    let(:installed_tab) { instance_double(Cask::Tab, tap: bar_tap) }
+
+    let(:cask_with_foo_tap) { instance_double(Cask::Cask, token: "test-cask", tap: foo_tap) }
+    let(:cask_with_bar_tap) { instance_double(Cask::Cask, token: "test-cask", tap: bar_tap) }
+
+    let(:load_args) { { config: nil, warn: true } }
+
+    before do
+      allow(described_class).to receive(:load).with("test-cask", load_args).and_return(cask_with_foo_tap)
+      allow(described_class).to receive(:load).with("user/foo/test-cask", load_args).and_return(cask_with_foo_tap)
+      allow(described_class).to receive(:load).with("user/bar/test-cask", load_args).and_return(cask_with_bar_tap)
+    end
+
+    it "returns the correct cask when no tap is specified and no tab exists" do
+      allow_any_instance_of(Cask::Cask).to receive(:tab).and_return(blank_tab)
+      expect(described_class).to receive(:load).with("test-cask", load_args)
+
+      expect(described_class.load_installed_cask("test-cask").tap).to eq(foo_tap)
+    end
+
+    it "returns the correct cask when no tap is specified but a tab exists" do
+      allow_any_instance_of(Cask::Cask).to receive(:tab).and_return(installed_tab)
+      expect(described_class).to receive(:load).with("user/bar/test-cask", load_args)
+
+      expect(described_class.load_installed_cask("test-cask").tap).to eq(bar_tap)
+    end
+
+    it "returns the correct cask when a tap is specified and no tab exists" do
+      allow_any_instance_of(Cask::Cask).to receive(:tab).and_return(blank_tab)
+      expect(described_class).to receive(:load).with("user/bar/test-cask", load_args)
+
+      expect(described_class.load_installed_cask("user/bar/test-cask").tap).to eq(bar_tap)
+    end
+
+    it "returns the correct cask when no tap is specified and a tab exists" do
+      allow_any_instance_of(Cask::Cask).to receive(:tab).and_return(installed_tab)
+      expect(described_class).to receive(:load).with("user/foo/test-cask", load_args)
+
+      expect(described_class.load_installed_cask("user/foo/test-cask").tap).to eq(foo_tap)
+    end
+
+    it "returns the correct cask when no tap is specified and the tab lists an tap that isn't installed" do
+      allow_any_instance_of(Cask::Cask).to receive(:tab).and_return(installed_tab)
+      expect(described_class).to receive(:load).with("user/bar/test-cask", load_args)
+                                               .and_raise(Cask::CaskUnavailableError.new("test-cask", bar_tap))
+      expect(described_class).to receive(:load).with("test-cask", load_args)
+
+      expect(described_class.load_installed_cask("test-cask").tap).to eq(foo_tap)
+    end
+  end
 end

Library/Homebrew/test/cli/named_args_spec.rb

@@ -217,6 +217,36 @@ RSpec.describe Homebrew::CLI::NamedArgs do
     it "when there are no matching kegs returns an empty array" do
       expect(described_class.new.to_kegs).to be_empty
     end
+
+    it "raises an error when a Keg is unavailable" do
+      expect { described_class.new("baz").to_kegs }.to raise_error NoSuchKegError
+    end
+
+    context "when a keg specifies a tap" do
+      let(:tab) { instance_double(Tab, tap: Tap.fetch("user", "repo")) }
+
+      before do
+        allow_any_instance_of(Keg).to receive(:tab).and_return(tab)
+      end
+
+      it "returns kegs if no tap is specified" do
+        stub_formula_loader bar, "user/repo/bar"
+
+        expect(described_class.new("bar").to_kegs.map(&:name)).to eq ["bar"]
+      end
+
+      it "returns kegs if the tap is specified" do
+        stub_formula_loader bar, "user/repo/bar"
+
+        expect(described_class.new("user/repo/bar").to_kegs.map(&:name)).to eq ["bar"]
+      end
+
+      it "raises an error if there is no tap match" do
+        stub_formula_loader bar, "other/tap/bar"
+
+        expect { described_class.new("other/tap/bar").to_kegs }.to raise_error(NoSuchKegFromTapError)
+      end
+    end
   end
 
   describe "#to_default_kegs" do

Library/Homebrew/test/exceptions_spec.rb

@@ -19,6 +19,14 @@ RSpec.describe "Exception" do
     end
   end
 
+  describe NoSuchKegFromTapError do
+    subject(:error) { described_class.new("foo", tap) }
+
+    let(:tap) { instance_double(Tap, to_s: "u/r") }
+
+    it(:to_s) { expect(error.to_s).to eq("No such keg: #{HOMEBREW_CELLAR}/foo from tap u/r") }
+  end
+
   describe NoSuchKegError do
     subject(:error) { described_class.new("foo") }