Don't actually care if git repo is inside the repository, always cach…

…e it, closes rubygems#1989

lib/bundler/source.rb

@@ -694,6 +694,9 @@ def name
         File.basename(@uri, '.git')
       end
 
+      # This is the path which is going to contain a specific
+      # checkout of the git repository. When using local git
+      # repos, this is set to the local repo.
       def install_path
         @install_path ||= begin
           git_scope = "#{base_name}-#{shortref_for_path(revision)}"
@@ -778,7 +781,7 @@ def install(spec)
 
       def cache(spec)
         return unless Bundler.settings[:cache_all]
-        return if path.expand_path(Bundler.root).to_s.index(Bundler.root.to_s) == 0
+        return if path == app_cache_path
         cached!
         FileUtils.rm_rf(app_cache_path)
         git_proxy.checkout if requires_checkout?
@@ -792,6 +795,10 @@ def load_spec_files
         raise GitError, "#{to_s} is not checked out. Please run `bundle install`"
       end
 
+      # This is the path which is going to contain a cache
+      # of the git repository. When using the same git repository
+      # across different projects, this cache will be shared.
+      # When using local git repos, this is set to the local repo.
       def cache_path
         @cache_path ||= begin
           git_scope = "#{base_name}-#{uri_hash}"

spec/cache/git_spec.rb

@@ -30,6 +30,24 @@
       should_be_installed "foo 1.0"
     end
 
+    it "copies repository to vendor cache and uses it even when installed with bundle --path" do
+      git = build_git "foo"
+      ref = git.ref_for("master", 11)
+
+      install_gemfile <<-G
+        gem "foo", :git => '#{lib_path("foo-1.0")}'
+      G
+
+      bundle "install --path vendor/bundle"
+      bundle "#{cmd} --all"
+
+      bundled_app("vendor/cache/foo-1.0-#{ref}").should exist
+      bundled_app("vendor/cache/foo-1.0-#{ref}/.git").should_not exist
+
+      FileUtils.rm_rf lib_path("foo-1.0")
+      should_be_installed "foo 1.0"
+    end
+
     it "runs twice without exploding" do
       build_git "foo"