os/mac/version: explain Big Sur to_sym logic.

2020-11-25 13:53:52 +00:00 · 2020-11-25 13:53:52 +00:00 · 88ba32c519
commit 88ba32c519
parent 8598b1186a
1 changed files with 9 additions and 1 deletions
--- a/Library/Homebrew/os/mac/version.rb
+++ b/Library/Homebrew/os/mac/version.rb
@ -51,7 +51,15 @@ module OS

      sig { returns(Symbol) }
      def to_sym
-        @to_sym ||= SYMBOLS.invert.fetch((major >= 11 ? major : major_minor).to_s, :dunno)
+        @to_sym ||= begin
+          # Big Sur is 11.x but Catalina is 10.15.
+          major_macos = if major >= 11
+            major
+          else
+            major_minor
+          end.to_s
+          SYMBOLS.invert.fetch(major_macos, :dunno)
+        end
      end

      sig { returns(String) }