Handle quotes in PATH

lib/bundler.rb

@@ -304,11 +304,11 @@ def which(executable)
       if File.file?(executable) && File.executable?(executable)
         executable
       elsif path = ENV["PATH"]
-        executable_path = path.split(File::PATH_SEPARATOR).find do |p|
-          abs_path = File.join(p, executable)
-          File.file?(abs_path) && File.executable?(abs_path)
+        path.split(File::PATH_SEPARATOR).find do |path|
+          path = path[1..-2] if path[0] == '"' && path[-1] == '"'
+          executable_path = File.expand_path(executable, path)
+          return executable_path if File.file?(executable_path) && File.executable?(executable_path)
         end
-        executable_path && File.expand_path(executable, executable_path)
       end
     end
 

spec/bundler/bundler_spec.rb

@@ -103,4 +103,41 @@
       end
     end
   end
+
+  describe "#which" do
+    let(:executable) { "executable" }
+    let(:path) { %w(/a /b c ../d "/e") }
+    let(:expected) { "executable" }
+
+    before do
+      ENV["PATH"] = path.join(File::PATH_SEPARATOR)
+
+      allow(File).to receive(:file?).and_return(false)
+      allow(File).to receive(:executable?).and_return(false)
+      if expected
+        expect(File).to receive(:file?).with(expected).and_return(true)
+        expect(File).to receive(:executable?).with(expected).and_return(true)
+      end
+    end
+
+    subject { described_class.which(executable) }
+
+    shared_examples_for "it returns the correct executable" do
+      it "returns the expected file" do
+        expect(subject).to eq(expected)
+      end
+    end
+
+    it_behaves_like "it returns the correct executable"
+
+    context "when the executable in inside a quoted path" do
+      let(:expected) { "/e/executable" }
+      it_behaves_like "it returns the correct executable"
+    end
+
+    context "when the executable is not found" do
+      let(:expected) { nil }
+      it_behaves_like "it returns the correct executable"
+    end
+  end
 end