[rubygems/rubygems] Restore support for passing relative paths to `:git`

The `file://` protocol does not really work with relative paths and it's
not necessary anyways. So restore support for that by not using
`file://`.

https://github.com/rubygems/rubygems/commit/16a68998ce

lib/bundler/source/git/git_proxy.rb

@@ -336,8 +336,6 @@ module Bundler
             config_auth = Bundler.settings[remote.to_s] || Bundler.settings[remote.host]
             remote.userinfo ||= config_auth
             remote.to_s
-          elsif File.exist?(uri)
-            "file://#{uri}"
           else
             uri.to_s
           end

spec/bundler/install/allow_offline_install_spec.rb

@@ -56,7 +56,7 @@ RSpec.describe "bundle install with :allow_offline_install" do
           fetch_args = %w(fetch --force --quiet --no-tags)
           clone_args = %w(clone --bare --no-hardlinks --quiet)
 
-          if (fetch_args.-(ARGV).empty? || clone_args.-(ARGV).empty?) && ARGV.any? {|arg| arg.start_with?("file://") }
+          if (fetch_args.-(ARGV).empty? || clone_args.-(ARGV).empty?) && File.exist?(ARGV[ARGV.index("--") + 1])
             warn "git remote ops have been disabled"
             exit 1
           end

spec/bundler/install/git_spec.rb

@@ -14,6 +14,19 @@ RSpec.describe "bundle install" do
       expect(the_bundle).to include_gems "foo 1.0", source: "git@#{lib_path("foo")}"
     end
 
+    it "displays the revision hash of the gem repository when passed a relative local path" do
+      build_git "foo", "1.0", path: lib_path("foo")
+
+      relative_path = lib_path("foo").relative_path_from(bundled_app)
+      install_gemfile <<-G, verbose: true
+        source "https://gem.repo1"
+        gem "foo", :git => "#{relative_path}"
+      G
+
+      expect(out).to include("Using foo 1.0 from #{relative_path} (at main@#{revision_for(lib_path("foo"))[0..6]})")
+      expect(the_bundle).to include_gems "foo 1.0", source: "git@#{lib_path("foo")}"
+    end
+
     it "displays the correct default branch", git: ">= 2.28.0" do
       build_git "foo", "1.0", path: lib_path("foo"), default_branch: "main"