Allow BUNDLE_GEMFILE to not be an absolute path

2 files changed, 10 insertions, 2 deletions

diff --git a/lib/bundler/shared_helpers.rb b/lib/bundler/shared_helpers.rb
index 07880387f0..bdc2aad113 100644
--- a/lib/bundler/shared_helpers.rb
+++ b/lib/bundler/shared_helpers.rb
@@ -191,7 +191,7 @@ module Bundler
 
     def find_gemfile(order_matters = false)
       given = ENV["BUNDLE_GEMFILE"]
-      return given if given && !given.empty?
+      return File.expand_path(given) if given && !given.empty?
       names = gemfile_names
       names.reverse! if order_matters && Bundler.feature_flag.prefer_gems_rb?
       find_file(*names)
diff --git a/spec/bundler/shared_helpers_spec.rb b/spec/bundler/shared_helpers_spec.rb
index 8586079974..880724180f 100644
--- a/spec/bundler/shared_helpers_spec.rb
+++ b/spec/bundler/shared_helpers_spec.rb
@@ -101,7 +101,7 @@ RSpec.describe Bundler::SharedHelpers do
       context "currently in directory with a Gemfile" do
         before { File.new("Gemfile", "w") }
 
-        it "returns path of the bundle gemfile" do
+        it "returns path of the bundle Gemfile" do
           expect(subject.in_bundle?).to eq("#{bundled_app}/Gemfile")
         end
       end
@@ -121,6 +121,14 @@ RSpec.describe Bundler::SharedHelpers do
       end
     end
 
+    context "ENV['BUNDLE_GEMFILE'] is set without an absolute path" do
+      before { ENV["BUNDLE_GEMFILE"] = "Gemfile" }
+
+      it "returns path of the bundle Gemfile" do
+        expect(subject.in_bundle?).to eq("#{bundled_app}/Gemfile")
+      end
+    end
+
     context "ENV['BUNDLE_GEMFILE'] not set" do
       before { ENV["BUNDLE_GEMFILE"] = nil }