reinstalls gem if gem dir is missing but spec exists

Conflicts:
	lib/bundler/source/rubygems.rb

2 files changed, 25 insertions, 1 deletions

diff --git a/lib/bundler/source/rubygems.rb b/lib/bundler/source/rubygems.rb
index 0b5d264118..28f6b47c2f 100644
--- a/lib/bundler/source/rubygems.rb
+++ b/lib/bundler/source/rubygems.rb
@@ -68,7 +68,7 @@ module Bundler
       end
 
       def install(spec)
-        if installed_specs[spec].any?
+        if installed_specs[spec].any? && gem_dir_exists?(spec)
           Bundler.ui.info "Using #{spec.name} (#{spec.version}) "
           return
         end
@@ -250,6 +250,14 @@ module Bundler
           Bundler.rubygems.sources = old
         end
       end
+
+      def gem_dir_exists?(spec)
+        if spec.name == "bundler"
+          true
+        else
+          File.directory?(spec.full_gem_path)
+        end
+      end
     end
 
   end
diff --git a/spec/install/gems/simple_case_spec.rb b/spec/install/gems/simple_case_spec.rb
index 4c38e77b82..f147b35b13 100644
--- a/spec/install/gems/simple_case_spec.rb
+++ b/spec/install/gems/simple_case_spec.rb
@@ -337,6 +337,22 @@ describe "bundle install with gem sources" do
       G
       expect(exitstatus).to eq(0)
     end
+
+    it "reinstalls the gem if the gem dir is missing but the specification file exists" do
+      gemfile(<<-G)
+        source "file://#{gem_repo1}"
+
+        gem 'foo'
+      G
+
+      bundle "install --path vendor/bundle"
+
+      FileUtils.rm_rf(vendored_gems('gems/foo-1.0'))
+
+      bundle "install"
+
+      expect(vendored_gems('gems/foo-1.0')).to exist
+    end
   end
 
   describe "when Bundler root contains regex chars" do