Merge pull request #6752 from bundler/indirect/backport-6737

backport #6737 to 1-16-stable

(cherry picked from commit 8a789f00bf5ce93928f0d03ac324387c7d58db46)

1 files changed, 11 insertions, 4 deletions

diff --git a/lib/bundler/build_metadata.rb b/lib/bundler/build_metadata.rb
index a0428f0319..33f91e9162 100644
--- a/lib/bundler/build_metadata.rb
+++ b/lib/bundler/build_metadata.rb
@@ -28,12 +28,19 @@ module Bundler
       # If Bundler has been installed without its .git directory and without a
       # commit instance variable then we can't determine its commits SHA.
       git_dir = File.join(File.expand_path("../../..", __FILE__), ".git")
-      return "unknown" unless File.directory?(git_dir)
+      if File.directory?(git_dir)
+        return @git_commit_sha = Dir.chdir(git_dir) { `git rev-parse --short HEAD`.strip.freeze }
+      end
 
-      # Otherwise shell out to git.
-      @git_commit_sha = Dir.chdir(File.expand_path("..", __FILE__)) do
-        `git rev-parse --short HEAD`.strip.freeze
+      # If Bundler is a submodule in RubyGems, get the submodule commit
+      git_sub_dir = File.join(File.expand_path("../../../..", __FILE__), ".git")
+      if File.directory?(git_sub_dir)
+        return @git_commit_sha = Dir.chdir(git_sub_dir) do
+          `git ls-tree --abbrev=8 HEAD bundler`.split(/\s/).fetch(2, "").strip.freeze
+        end
       end
+
+      @git_commit_sha ||= "unknown"
     end
 
     # Whether this is an official release build of Bundler.