MacOS: full_version added

Closes Homebrew/homebrew#44988.

Signed-off-by: Xu Cheng <xucheng@me.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/Library/Homebrew/os/mac.rb b/Library/Homebrew/os/mac.rb
index 2fda9c085..691f92b51 100644
--- a/Library/Homebrew/os/mac.rb
+++ b/Library/Homebrew/os/mac.rb
@@ -12,7 +12,13 @@ module OS
     # This can be compared to numerics, strings, or symbols
     # using the standard Ruby Comparable methods.
     def version
-      @version ||= Version.new(MACOS_VERSION)
+      @version ||= Version.new(full_version.to_s[/10\.\d+/])
+    end
+
+    # This can be compared to numerics, strings, or symbols
+    # using the standard Ruby Comparable methods.
+    def full_version
+      @full_version ||= Version.new(`/usr/bin/sw_vers -productVersion`.chomp)
     end
 
     def cat