Add --shebang option to bundle install to use a different executable …

…than the default ruby install name

lib/bundler/cli.rb

@@ -142,6 +142,8 @@ def check
       "Do not attempt to fetch gems remotely and use the gem cache instead"
     method_option "binstubs", :type => :string, :lazy_default => "bin", :banner =>
       "Generate bin stubs for bundled gems to ./bin"
+    method_option "shebang", :type => :string, :banner =>
+      "Specify a different shebang executable name than the default (usually 'ruby')"
     method_option "path", :type => :string, :banner =>
       "Specify a different path than the system default ($BUNDLE_PATH or $GEM_HOME). Bundler will remember this value for future installs on this machine"
     method_option "system", :type => :boolean, :banner =>
@@ -204,6 +206,7 @@ def install
       Bundler.settings[:path]   = opts[:path] if opts[:path]
       Bundler.settings[:path] ||= "bundle" if opts[:standalone]
       Bundler.settings[:bin]    = opts["binstubs"] if opts[:binstubs]
+      Bundler.settings[:shebang] = opts["shebang"] if opts[:shebang]
       Bundler.settings[:no_prune] = true if opts["no-prune"]
       Bundler.settings[:disable_shared_gems] = Bundler.settings[:path] ? '1' : nil
       Bundler.settings.without = opts[:without]

lib/bundler/templates/Executable

@@ -1,4 +1,4 @@
-#!/usr/bin/env <%= RbConfig::CONFIG['ruby_install_name'] %>
+#!/usr/bin/env <%= Bundler.settings[:shebang] || RbConfig::CONFIG['ruby_install_name'] %>
 #
 # This file was generated by Bundler.
 #

spec/runtime/executable_spec.rb

@@ -36,6 +36,16 @@
     out.should == "1.0.0"
   end
 
+  it "uses the default ruby install name when shebang is not specified" do
+   bundle "install --binstubs"
+   File.open("bin/rackup").gets.should == "#!/usr/bin/env #{RbConfig::CONFIG['ruby_install_name']}\n"
+  end
+
+  it "allows the name of the shebang executable to be specified" do
+    bundle "install --binstubs --shebang ruby-foo"
+    File.open("bin/rackup").gets.should == "#!/usr/bin/env ruby-foo\n"
+  end
+
   it "runs the bundled command when out of the bundle" do
     bundle "install --binstubs"