Ensure git sources are checked out before using them

Fixes #221

2 files changed, 18 insertions, 1 deletions

diff --git a/lib/bundler/source.rb b/lib/bundler/source.rb
index 92dd575a0c..1ba6f0b7f4 100644
--- a/lib/bundler/source.rb
+++ b/lib/bundler/source.rb
@@ -318,7 +318,7 @@ module Bundler
       end
 
       def cache
-        if cache_path.exist?
+        if cached?
           Bundler.ui.info "Updating #{uri}"
           in_cache { git %|fetch --quiet "#{uri}" master:master| }
         else
@@ -342,7 +342,12 @@ module Bundler
         @revision ||= in_cache { git("rev-parse #{ref}").strip }
       end
 
+      def cached?
+        cache_path.exist?
+      end
+
       def in_cache(&blk)
+        cache unless cached?
         Dir.chdir(cache_path, &blk)
       end
     end
diff --git a/spec/install/git_spec.rb b/spec/install/git_spec.rb
index aed101dc76..a8da7d802b 100644
--- a/spec/install/git_spec.rb
+++ b/spec/install/git_spec.rb
@@ -256,4 +256,16 @@ describe "bundle install with git sources" do
 
     should_be_installed "foo 1.0"
   end
+
+  it "notices when you change the repo url in the Gemfile" do
+    build_git "foo_one"
+    build_git "foo_two"
+    install_gemfile %|gem "foo", "1.0", :git => "#{lib_path('foo_one-1.0')}"|
+    gemfile %|gem "foo", "1.0", :git => "#{lib_path('foo_two-1.0')}"|
+    bundle :lock
+
+    err.should be_empty
+    out.should match(/could not find gem 'foo/i)
+    out.should match(/run `bundle install`/i)
+  end
 end