feat: allow cask binaries on linux

Library/Homebrew/cask/artifact/symlinked.rb

@@ -72,14 +72,10 @@ def unlink(command: nil, **)
         Utils.gain_permissions_remove(target, command:)
       end
 
-      def create_filesystem_link(command: nil)
-        Utils.gain_permissions_mkpath(target.dirname, command:)
-
-        command.run! "/bin/ln", args: ["-h", "-f", "-s", "--", source, target],
-                                sudo: !target.dirname.writable?
-
-        add_altname_metadata(source, target.basename, command:)
-      end
+      sig { params(command: T.class_of(SystemCommand)).void }
+      def create_filesystem_link(command:); end
     end
   end
 end
+
+require "extend/os/cask/artifact/symlinked"

Library/Homebrew/extend/on_system.rbi

@@ -4,3 +4,12 @@ module OnSystem::MacOSOnly
   sig { params(arm: T.nilable(String), intel: T.nilable(String)).returns(T.nilable(String)) }
   def on_arch_conditional(arm: nil, intel: nil); end
 end
+
+
+module OnSystem::MacOSAndLinux
+  sig { params(macos: T.nilable(String), linux: T.nilable(String)).returns(T.nilable(String)) }
+  def on_system_conditional(macos: nil, linux: nil); end
+
+  sig { params(arm: T.nilable(String), intel: T.nilable(String)).returns(T.nilable(String)) }
+  def on_arch_conditional(arm: nil, intel: nil); end
+end

Library/Homebrew/extend/os/cask/artifact/symlinked.rb

@@ -0,0 +1,5 @@
+# typed: strict
+# frozen_string_literal: true
+
+require "extend/os/mac/cask/artifact/symlinked" if OS.mac?
+require "extend/os/linux/cask/artifact/symlinked" if OS.linux?

Library/Homebrew/extend/os/linux/cask/artifact/symlinked.rb

@@ -0,0 +1,26 @@
+# typed: strict
+# frozen_string_literal: true
+
+module OS
+  module Linux
+    module Cask
+      module Artifact
+        module Symlinked
+          extend T::Helpers
+
+          requires_ancestor { ::Cask::Artifact::Symlinked }
+
+          sig { params(command: T.class_of(SystemCommand)).void }
+          def create_filesystem_link(command)
+            ::Cask::Utils.gain_permissions_mkpath(target.dirname, command:)
+
+            command.run! "/bin/ln", args: ["--no-dereference", "--force", "--symbolic", source, target],
+                                    sudo: !target.dirname.writable?
+          end
+        end
+      end
+    end
+  end
+end
+
+Cask::Artifact::Symlinked.prepend(OS::Linux::Cask::Artifact::Symlinked)

Library/Homebrew/extend/os/linux/cask/installer.rb

@@ -15,6 +15,9 @@ module Installer
         def check_stanza_os_requirements
           return if artifacts.all?(::Cask::Artifact::Font)
 
+          install_artifacts = artifacts.reject { |artifact| artifact.instance_of?(::Cask::Artifact::Zap) }
+          return if install_artifacts.all?(::Cask::Artifact::Binary)
+
           raise ::Cask::CaskError, "macOS is required for this software."
         end
       end

Library/Homebrew/extend/os/mac/cask/artifact/symlinked.rb

@@ -0,0 +1,30 @@
+# typed: strict
+# frozen_string_literal: true
+
+require "cask/macos"
+
+module OS
+  module Mac
+    module Cask
+      module Artifact
+        module Symlinked
+          extend T::Helpers
+
+          requires_ancestor { ::Cask::Artifact::Symlinked }
+
+          sig { params(command: T.class_of(SystemCommand)).void }
+          def create_filesystem_link(command)
+            ::Cask::Utils.gain_permissions_mkpath(target.dirname, command:)
+
+            command.run! "/bin/ln", args: ["-h", "-f", "-s", "--", source, target],
+                                    sudo: !target.dirname.writable?
+
+            add_altname_metadata(source, target.basename, command:)
+          end
+        end
+      end
+    end
+  end
+end
+
+Cask::Artifact::Symlinked.prepend(OS::Mac::Cask::Artifact::Symlinked)