fix standalone executable when dest of symlink

When an executable is the destination of a symlink `__FILE__` contains
the path to the symlink, rather than the actual path of the current
file.

Pathname#realpath resolves symlinks to get the actual location on disk.

3 files changed, 20 insertions, 5 deletions

diff --git a/lib/bundler/templates/Executable.standalone b/lib/bundler/templates/Executable.standalone
index c4f2703495..c114afe337 100644
--- a/lib/bundler/templates/Executable.standalone
+++ b/lib/bundler/templates/Executable.standalone
@@ -6,7 +6,9 @@
 # this file is here to facilitate running it.
 #
 
-$:.unshift File.expand_path '../<%= standalone_path %>', __FILE__
+require 'pathname'
+path = Pathname.new(__FILE__)
+$:.unshift File.expand_path '../<%= standalone_path %>', path.realpath
 
 require 'bundler/setup'
-load File.expand_path '../<%= executable_path %>', __FILE__
+load File.expand_path '../<%= executable_path %>', path.realpath
diff --git a/spec/commands/binstubs_spec.rb b/spec/commands/binstubs_spec.rb
index 35c9d187a0..0f8c5af391 100644
--- a/spec/commands/binstubs_spec.rb
+++ b/spec/commands/binstubs_spec.rb
@@ -157,7 +157,7 @@ describe "bundle binstubs <gem>" do
     it "includes the standalone path" do
       bundle "binstubs rack --standalone"
       standalone_line = File.read(bundled_app("bin/rackup")).each_line.find {|line| line.include? "$:.unshift" }.strip
-      expect(standalone_line).to eq "$:.unshift File.expand_path '../../bundle', __FILE__"
+      expect(standalone_line).to eq "$:.unshift File.expand_path '../../bundle', path.realpath"
     end
   end
 
diff --git a/spec/install/gems/standalone_spec.rb b/spec/install/gems/standalone_spec.rb
index 64e01a7495..7a6749dea9 100644
--- a/spec/install/gems/standalone_spec.rb
+++ b/spec/install/gems/standalone_spec.rb
@@ -279,13 +279,26 @@ shared_examples "bundle install --standalone" do
     it "creates stubs that can be executed from anywhere" do
       require "tmpdir"
       Dir.chdir(Dir.tmpdir) do
-        expect(`#{bundled_app("bin/rails")} -v`.chomp).to eql "2.3.2"
+        sys_exec!(%(#{bundled_app("bin/rails")} -v))
+        expect(out).to eq("2.3.2")
       end
     end
 
+    it "creates stubs that can be symlinked" do
+      pending "File.symlink is unsupported on Windows" if Bundler::WINDOWS
+
+      symlink_dir = tmp("symlink")
+      FileUtils.mkdir_p(symlink_dir)
+      symlink = File.join(symlink_dir, "rails")
+
+      File.symlink(bundled_app("bin/rails"), symlink)
+      sys_exec!("#{symlink} -v")
+      expect(out).to eq("2.3.2")
+    end
+
     it "creates stubs with the correct load path" do
       extension_line = File.read(bundled_app("bin/rails")).each_line.find {|line| line.include? "$:.unshift" }.strip
-      expect(extension_line).to eq "$:.unshift File.expand_path '../../bundle', __FILE__"
+      expect(extension_line).to eq "$:.unshift File.expand_path '../../bundle', path.realpath"
     end
   end
 end