From 6219cd0a9279989caf56eb1f6c530c69ae5dd713 Mon Sep 17 00:00:00 2001
From: Harry Marr <harry.marr@gmail.com>
Date: Sun, 12 Jun 2022 10:48:47 -0400
Subject: [PATCH] Use different cache tag for sparse checkouts

---
 Library/Homebrew/download_strategy.rb | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/Library/Homebrew/download_strategy.rb b/Library/Homebrew/download_strategy.rb
index b062ca362f..3d917eb7f6 100644
--- a/Library/Homebrew/download_strategy.rb
+++ b/Library/Homebrew/download_strategy.rb
@@ -811,10 +811,13 @@ end
 # @api public
 class GitDownloadStrategy < VCSDownloadStrategy
   def initialize(url, name, version, **meta)
+    # Needs to be before the call to `super`, as the VCSDownloadStrategy's
+    # constructor calls `cache_tag` and sets the cache path.
+    @only_paths = meta[:only_paths]
+
     super
     @ref_type ||= :branch
     @ref ||= "master"
-    @only_paths = meta[:only_paths]
   end
 
   # @see AbstractDownloadStrategy#source_modified_time
@@ -837,7 +840,11 @@ class GitDownloadStrategy < VCSDownloadStrategy
 
   sig { returns(String) }
   def cache_tag
-    "git"
+    if partial_clone_sparse_checkout?
+      "git-sparse"
+    else
+      "git"
+    end
   end
 
   sig { returns(Integer) }