Handle broken symlinks in create-hooks

If a repository contained a broken symlink named 'hooks', this would
raise ENOENT in lib/gitlab_projects.rb, which got ignored in
bin/create-hooks. This commit fixes that by making sure we handle
broken symlinks in lib/gitlab_projects.rb.

lib/gitlab_projects.rb

@@ -21,11 +21,19 @@ class GitlabProjects
 
   def self.create_hooks(path)
     local_hooks_directory = File.join(path, 'hooks')
+    real_local_hooks_directory = :not_found
+    begin
+      real_local_hooks_directory = File.realpath(local_hooks_directory)
+    rescue Errno::ENOENT
+      # real_local_hooks_directory == :not_found
+    end
 
-    if File.realpath(local_hooks_directory) != File.realpath(GLOBAL_HOOKS_DIRECTORY)
-      $logger.info "Moving existing hooks directory and symlinking global hooks directory for #{path}."
-      FileUtils.mv(local_hooks_directory, "#{local_hooks_directory}.old.#{Time.now.to_i}")
-      FileUtils.ln_s(GLOBAL_HOOKS_DIRECTORY, local_hooks_directory)
+    if real_local_hooks_directory != File.realpath(GLOBAL_HOOKS_DIRECTORY)
+      if File.exist?(local_hooks_directory)
+        $logger.info "Moving existing hooks directory and symlinking global hooks directory for #{path}."
+        FileUtils.mv(local_hooks_directory, "#{local_hooks_directory}.old.#{Time.now.to_i}")
+      end
+      FileUtils.ln_sf(GLOBAL_HOOKS_DIRECTORY, local_hooks_directory)
     else
       $logger.info "Hooks already exist for #{path}."
       true

spec/gitlab_projects_spec.rb

@@ -12,6 +12,51 @@ describe GitlabProjects do
     FileUtils.rm_rf(tmp_repos_path)
   end
 
+  describe :create_hooks do
+    let(:repo_path) { File.join(tmp_repos_path, 'hook-test.git') }
+    let(:hooks_dir) { File.join(repo_path, 'hooks') }
+    let(:target_hooks_dir) { File.join(ROOT_PATH, 'hooks') }
+    let(:existing_target) { File.join(repo_path, 'foobar') }
+
+    before do
+      FileUtils.rm_rf(repo_path)
+      FileUtils.mkdir_p(repo_path)
+    end
+
+    context 'hooks is a directory' do
+      let(:existing_file) { File.join(hooks_dir, 'my-file') }
+
+      before do
+        FileUtils.mkdir_p(hooks_dir)
+        FileUtils.touch(existing_file)
+        GitlabProjects.create_hooks(repo_path)
+      end
+
+      it { File.readlink(hooks_dir).should == target_hooks_dir }
+      it { Dir[File.join(repo_path, "hooks.old.*/my-file")].count.should == 1 }
+    end
+
+    context 'hooks is a valid symlink' do
+      before do
+        FileUtils.mkdir_p existing_target
+        File.symlink(existing_target, hooks_dir)
+        GitlabProjects.create_hooks(repo_path)
+      end
+
+      it { File.readlink(hooks_dir).should == target_hooks_dir }
+    end
+
+    context 'hooks is a broken symlink' do
+      before do
+        FileUtils.rm_f(existing_target)
+        File.symlink(existing_target, hooks_dir)
+        GitlabProjects.create_hooks(repo_path)
+      end
+
+      it { File.readlink(hooks_dir).should == target_hooks_dir }
+    end
+  end
+
   describe :initialize do
     before do
       argv('add-project', repo_name)