Auto merge of #4244 - dtognazzini:fix-path-to-gemfile, r=indirect

Fix the path to the Gemfile during evaluation.

This is a continuation of #3349 Following up per: #3349 (comment)

The issue here is that paths used with `Bundler::Dsl#gemspec` will only work when the Gemfile being evaluated is `Bundler.default_gemfile`.

Passing a Gemfile other than `Bundler.default_gemfile` to `Bundler::Dsl.evaluate` will break uses of `path:` options in the Gemfile.

These changes update `Bundler::Dsl` to remember the Gemfile passed into `eval_gemfile` and use it to resolve relative paths.

lib/bundler/dsl.rb

@@ -28,10 +28,12 @@ def initialize
       @env                  = nil
       @ruby_version         = nil
       @gemspecs             = []
+      @gemfile              = nil
       add_git_sources
     end
 
     def eval_gemfile(gemfile, contents = nil)
+      @gemfile = Pathname.new(gemfile)
       contents ||= Bundler.read_file(gemfile.to_s)
       instance_eval(contents, gemfile.to_s, 1)
     rescue Exception => e
@@ -47,7 +49,7 @@ def gemspec(opts = nil)
       glob              = opts && opts[:glob]
       name              = opts && opts[:name] || "{,*}"
       development_group = opts && opts[:development_group] || :development
-      expanded_path     = File.expand_path(path, Bundler.default_gemfile.dirname)
+      expanded_path     = gemfile_root.join(path)
 
       gemspecs = Dir[File.join(expanded_path, "#{name}.gemspec")]
 
@@ -144,7 +146,9 @@ def git_source(name, &block)
     end
 
     def path(path, options = {}, &blk)
-      with_source(@sources.add_path_source(normalize_hash(options).merge("path" => Pathname.new(path))), &blk)
+      source_options = normalize_hash(options).merge("path" => Pathname.new(path), "root_path" => gemfile_root)
+      source = @sources.add_path_source(source_options)
+      with_source(source, &blk)
     end
 
     def git(uri, options = {}, &blk)
@@ -487,5 +491,10 @@ def parse_line_number_from_description
         [trace_line, description]
       end
     end
+
+    def gemfile_root
+      @gemfile ||= Bundler.default_gemfile
+      @gemfile.dirname
+    end
   end
 end

lib/bundler/source/path.rb

@@ -3,7 +3,7 @@ class Source
     class Path < Source
       autoload :Installer, "bundler/source/path/installer"
 
-      attr_reader :path, :options
+      attr_reader :path, :options, :root_path
       attr_writer :name
       attr_accessor :version
 
@@ -16,6 +16,8 @@ def initialize(options)
         @allow_cached = false
         @allow_remote = false
 
+        @root_path = options["root_path"] || Bundler.root
+
         if options["path"]
           @path = Pathname.new(options["path"])
           @path = expand(@path) unless @path.relative?
@@ -77,7 +79,7 @@ def install(spec, force = false)
       def cache(spec, custom_path = nil)
         app_cache_path = app_cache_path(custom_path)
         return unless Bundler.settings[:cache_all]
-        return if expand(@original_path).to_s.index(Bundler.root.to_s + "/") == 0
+        return if expand(@original_path).to_s.index(root_path.to_s + "/") == 0
 
         unless @original_path.exist?
           raise GemNotFound, "Can't cache gem #{version_message(spec)} because #{self} is missing!"
@@ -111,7 +113,7 @@ def expanded_path
       end
 
       def expand(somepath)
-        somepath.expand_path(Bundler.root)
+        somepath.expand_path(root_path)
       rescue ArgumentError => e
         Bundler.ui.debug(e)
         raise PathError, "There was an error while trying to use the path " \
@@ -164,8 +166,8 @@ def load_spec_files
       end
 
       def relative_path
-        if path.to_s.start_with?(Bundler.root.to_s)
-          return path.relative_path_from(Bundler.root)
+        if path.to_s.start_with?(root_path.to_s)
+          return path.relative_path_from(root_path)
         end
         path
       end

spec/bundler/dsl_spec.rb

@@ -235,6 +235,7 @@
       it "restores it after it's done" do
         other_source = double("other-source")
         allow(Bundler::Source::Rubygems).to receive(:new).and_return(other_source)
+        allow(Bundler).to receive(:default_gemfile).and_return(Pathname.new("./Gemfile"))
 
         subject.source("https://other-source.org") do
           subject.gem("dobry-pies", :path => "foo")