[rubygems/rubygems] fix bundle which commands on windows

https://github.com/rubygems/rubygems/commit/9e0018d9fe

lib/bundler.rb

@@ -495,18 +495,27 @@ module Bundler
     end
 
     def which(executable)
-      if File.file?(executable) && File.executable?(executable)
-        executable
-      elsif paths = ENV["PATH"]
+      executable_path = find_executable(executable)
+      return executable_path if executable_path
+
+      if (paths = ENV["PATH"])
         quote = '"'
         paths.split(File::PATH_SEPARATOR).find do |path|
           path = path[1..-2] if path.start_with?(quote) && path.end_with?(quote)
-          executable_path = File.expand_path(executable, path)
-          return executable_path if File.file?(executable_path) && File.executable?(executable_path)
+          executable_path = find_executable(File.expand_path(executable, path))
+          return executable_path if executable_path
         end
       end
     end
 
+    def find_executable(path)
+      extensions = RbConfig::CONFIG["EXECUTABLE_EXTS"]&.split
+      extensions = [RbConfig::CONFIG["EXEEXT"]] unless extensions&.any?
+      candidates = extensions.map {|ext| "#{path}#{ext}" }
+
+      candidates.find {|candidate| File.file?(candidate) && File.executable?(candidate) }
+    end
+
     def read_file(file)
       SharedHelpers.filesystem_access(file, :read) do
         File.open(file, "r:UTF-8", &:read)
@@ -559,7 +568,7 @@ module Bundler
 
     def git_present?
       return @git_present if defined?(@git_present)
-      @git_present = Bundler.which("git#{RbConfig::CONFIG["EXEEXT"]}")
+      @git_present = Bundler.which("git")
     end
 
     def feature_flag

spec/bundler/bundler/bundler_spec.rb

@@ -174,7 +174,13 @@ RSpec.describe Bundler do
       end
     end
 
-    let(:expected) { "executable" }
+    let(:expected) do
+      if Gem.win_platform?
+        "executable.exe"
+      else
+        "executable"
+      end
+    end
 
     before do
       ENV["PATH"] = path.join(File::PATH_SEPARATOR)
@@ -200,7 +206,7 @@ RSpec.describe Bundler do
     context "when the executable in inside a quoted path" do
       let(:expected) do
         if Gem.win_platform?
-          "C:/e/executable"
+          "C:/e/executable.exe"
         else
           "/e/executable"
         end