Modify installation path

Conflicts:
	lib/bundler/source_list.rb

lib/bundler/settings.rb

@@ -12,6 +12,10 @@ def initialize(root = nil)
       @global_config = load_config(global_config_file)
     end
 
+    def root
+      @root
+    end
+
     def [](name)
       key = key_for(name)
       value = (@local_config[key] || ENV[key] || @global_config[key] || DEFAULT_CONFIG[name])
@@ -141,7 +145,7 @@ def path
 
       if path = self[:path]
         path = "#{path}/#{Bundler.ruby_scope}" if path != Bundler.rubygems.gem_dir
-        File.expand_path(path)
+        path
       else
         File.join(@root, Bundler.ruby_scope)
       end

lib/bundler/source/rubygems.rb

@@ -126,8 +126,21 @@ def install(spec, opts = {})
             install_path = Bundler.tmp(spec.full_name)
             bin_path     = install_path.join("bin")
           else
-            install_path = File.expand_path(Bundler.settings.path)
-            bin_path     = Bundler.system_bindir
+
+            set_path = Bundler.settings.path
+
+            # TODO: document exactly what's going on here and in Bundler.settings.path
+            if set_path == File.join(Bundler.settings.root, Bundler.ruby_scope) # ?
+              install_path = Bundler.settings.path
+            elsif set_path == Bundler.rubygems.gem_dir # system gems path
+              install_path = Bundler.settings.path
+            elsif Pathname.new(set_path).absolute? # all other absolute paths
+              install_path = Bundler.settings.path
+            else # all relative paths
+              install_path = File.join(Bundler::root, Bundler.settings.path)
+            end
+
+            bin_path = Bundler.system_bindir
           end
 
           installed_spec = nil

spec/install/path_spec.rb

@@ -92,6 +92,7 @@ def set_bundle_path(type, location)
         # FIXME: If the bundle_path is `"vendor"` instead of
         # `bundled_app("vendor").to_s`, this spec fails. As is, this spec
         # may not test what happens when `path` is relative.
+
         bundle "config path vendor"
         #set_bundle_path(type, bundled_app("vendor").to_s)