git_available?: cache the result

1 files changed, 4 insertions, 3 deletions

diff --git a/Library/Homebrew/utils/git.rb b/Library/Homebrew/utils/git.rb
index 53057cd10..774a0a65f 100644
--- a/Library/Homebrew/utils/git.rb
+++ b/Library/Homebrew/utils/git.rb
@@ -1,11 +1,12 @@
 module Utils
   def self.git_available?
+    return @git if instance_variable_defined?(:@git)
     git = which("git")
     # git isn't installed by older Xcodes
-    return false if git.nil?
+    return @git = false if git.nil?
     # /usr/bin/git is a popup stub when Xcode/CLT aren't installed, so bail out
-    return false if git == "/usr/bin/git" && !OS::Mac.has_apple_developer_tools?
-    true
+    return @git = false if git == "/usr/bin/git" && !OS::Mac.has_apple_developer_tools?
+    @git = true
   end
 
   def self.ensure_git_installed!