Implement git refs API for listing references (branches, tags and other) (#5354)

* Inital routes to git refs api

* Git refs API implementation

* Update swagger

* Fix copyright

* Make swagger happy add basic test

* Fix test

* Fix test again :)

vendor/github.com/xanzy/ssh-agent/sshagent.go

@@ -0,0 +1,49 @@
+//
+// Copyright 2015, Sander van Harmelen
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// +build !windows
+
+package sshagent
+
+import (
+	"errors"
+	"fmt"
+	"net"
+	"os"
+
+	"golang.org/x/crypto/ssh/agent"
+)
+
+// New returns a new agent.Agent that uses a unix socket
+func New() (agent.Agent, net.Conn, error) {
+	if !Available() {
+		return nil, nil, errors.New("SSH agent requested but SSH_AUTH_SOCK not-specified")
+	}
+
+	sshAuthSock := os.Getenv("SSH_AUTH_SOCK")
+
+	conn, err := net.Dial("unix", sshAuthSock)
+	if err != nil {
+		return nil, nil, fmt.Errorf("Error connecting to SSH_AUTH_SOCK: %v", err)
+	}
+
+	return agent.NewClient(conn), conn, nil
+}
+
+// Available returns true is a auth socket is defined
+func Available() bool {
+	return os.Getenv("SSH_AUTH_SOCK") != ""
+}