[rubygems/rubygems] Restore previous application cache format for git sources

And make sure `bundle install --local` can install from it without git.

https://github.com/rubygems/rubygems/commit/7d6b631620

lib/bundler/runtime.rb

@@ -139,6 +139,11 @@ module Bundler
         spec.source.cache(spec, custom_path) if spec.source.respond_to?(:cache)
       end
 
+      Dir[cache_path.join("*/.git")].each do |git_dir|
+        FileUtils.rm_rf(git_dir)
+        FileUtils.touch(File.expand_path("../.bundlecache", git_dir))
+      end
+
       prune_cache(cache_path) unless Bundler.settings[:no_prune]
     end
 

lib/bundler/source/git.rb

@@ -188,12 +188,10 @@ module Bundler
       end
 
       def specs(*)
-        set_up_app_cache!(app_cache_path) if use_app_cache?
+        set_cache_path!(app_cache_path) if use_app_cache?
 
         if requires_checkout? && !@copied
-          FileUtils.rm_rf(app_cache_path) if use_app_cache? && git_proxy.not_a_repository?
-
-          fetch
+          fetch unless use_app_cache?
           checkout
         end
 
@@ -225,9 +223,7 @@ module Bundler
         cached!
         FileUtils.rm_rf(app_cache_path)
         git_proxy.checkout if requires_checkout?
-        FileUtils.cp_r("#{cache_path}/.", app_cache_path)
-        FileUtils.touch(app_cache_path.join(".bundlecache"))
-        FileUtils.rm_rf(Dir.glob(app_cache_path.join("hooks/*.sample")))
+        git_proxy.copy_to(app_cache_path, @submodules)
       end
 
       def load_spec_files
@@ -273,7 +269,14 @@ module Bundler
 
       def checkout
         Bundler.ui.debug "  * Checking out revision: #{ref}"
-        git_proxy.copy_to(install_path, submodules)
+        if use_app_cache?
+          SharedHelpers.filesystem_access(install_path.dirname) do |p|
+            FileUtils.mkdir_p(p)
+          end
+          FileUtils.cp_r("#{app_cache_path}/.", install_path)
+        else
+          git_proxy.copy_to(install_path, submodules)
+        end
         serialize_gemspecs_in(install_path)
         @copied = true
       end
@@ -321,11 +324,6 @@ module Bundler
         @install_path = path
       end
 
-      def set_up_app_cache!(path)
-        FileUtils.mkdir_p(path.join("refs"))
-        set_cache_path!(path)
-      end
-
       def has_app_cache?
         locked_revision && super
       end

lib/bundler/source/git/git_proxy.rb

@@ -84,12 +84,6 @@ module Bundler
           end
         end
 
-        def not_a_repository?
-          _, status = git_null("rev-parse", "--resolve-git-dir", path.to_s, dir: path)
-
-          !status.success?
-        end
-
         def contains?(commit)
           allowed_with_path do
             result, status = git_null("branch", "--contains", commit, dir: path)

spec/bundler/cache/git_spec.rb

@@ -27,7 +27,6 @@ RSpec.describe "bundle cache with git" do
     expect(bundled_app("vendor/cache/foo-1.0-#{ref}")).to exist
     expect(bundled_app("vendor/cache/foo-1.0-#{ref}/.git")).not_to exist
     expect(bundled_app("vendor/cache/foo-1.0-#{ref}/.bundlecache")).to be_file
-    expect(Dir.glob(bundled_app("vendor/cache/foo-1.0-#{ref}/hooks/*.sample"))).to be_empty
 
     FileUtils.rm_rf lib_path("foo-1.0")
     expect(the_bundle).to include_gems "foo 1.0"
@@ -240,7 +239,7 @@ RSpec.describe "bundle cache with git" do
     expect(the_bundle).to include_gem "foo 1.0"
   end
 
-  it "copies repository to vendor cache" do
+  it "copies repository to vendor cache, including submodules" do
     # CVE-2022-39253: https://lore.kernel.org/lkml/xmqq4jw1uku5.fsf@gitster.g/
     system(*%W[git config --global protocol.file.allow always])
 
@@ -265,6 +264,7 @@ RSpec.describe "bundle cache with git" do
     bundle :cache
 
     expect(bundled_app("vendor/cache/has_submodule-1.0-#{ref}")).to exist
+    expect(bundled_app("vendor/cache/has_submodule-1.0-#{ref}/submodule-1.0")).to exist
     expect(the_bundle).to include_gems "has_submodule 1.0"
   end
 
@@ -275,7 +275,6 @@ RSpec.describe "bundle cache with git" do
       source "https://gem.repo1"
       gem "foo", :git => '#{lib_path("foo-1.0")}'
     G
-    bundle "config set path vendor/bundle"
     bundle "config set cache_all true"
     bundle :cache, "all-platforms" => true, :install => false