Add glide.yaml and vendor deps

vendor/github.com/docker/distribution/health/checks/checks.go

@@ -0,0 +1,62 @@
+package checks
+
+import (
+	"errors"
+	"net"
+	"net/http"
+	"os"
+	"strconv"
+	"time"
+
+	"github.com/docker/distribution/health"
+)
+
+// FileChecker checks the existence of a file and returns an error
+// if the file exists.
+func FileChecker(f string) health.Checker {
+	return health.CheckFunc(func() error {
+		if _, err := os.Stat(f); err == nil {
+			return errors.New("file exists")
+		}
+		return nil
+	})
+}
+
+// HTTPChecker does a HEAD request and verifies that the HTTP status code
+// returned matches statusCode.
+func HTTPChecker(r string, statusCode int, timeout time.Duration, headers http.Header) health.Checker {
+	return health.CheckFunc(func() error {
+		client := http.Client{
+			Timeout: timeout,
+		}
+		req, err := http.NewRequest("HEAD", r, nil)
+		if err != nil {
+			return errors.New("error creating request: " + r)
+		}
+		for headerName, headerValues := range headers {
+			for _, headerValue := range headerValues {
+				req.Header.Add(headerName, headerValue)
+			}
+		}
+		response, err := client.Do(req)
+		if err != nil {
+			return errors.New("error while checking: " + r)
+		}
+		if response.StatusCode != statusCode {
+			return errors.New("downstream service returned unexpected status: " + strconv.Itoa(response.StatusCode))
+		}
+		return nil
+	})
+}
+
+// TCPChecker attempts to open a TCP connection.
+func TCPChecker(addr string, timeout time.Duration) health.Checker {
+	return health.CheckFunc(func() error {
+		conn, err := net.DialTimeout("tcp", addr, timeout)
+		if err != nil {
+			return errors.New("connection to " + addr + " failed")
+		}
+		conn.Close()
+		return nil
+	})
+}

vendor/github.com/docker/distribution/health/checks/checks_test.go

@@ -0,0 +1,25 @@
+package checks
+
+import (
+	"testing"
+)
+
+func TestFileChecker(t *testing.T) {
+	if err := FileChecker("/tmp").Check(); err == nil {
+		t.Errorf("/tmp was expected as exists")
+	}
+
+	if err := FileChecker("NoSuchFileFromMoon").Check(); err != nil {
+		t.Errorf("NoSuchFileFromMoon was expected as not exists, error:%v", err)
+	}
+}
+
+func TestHTTPChecker(t *testing.T) {
+	if err := HTTPChecker("https://www.google.cybertron", 200, 0, nil).Check(); err == nil {
+		t.Errorf("Google on Cybertron was expected as not exists")
+	}
+
+	if err := HTTPChecker("https://www.google.pt", 200, 0, nil).Check(); err != nil {
+		t.Errorf("Google at Portugal was expected as exists, error:%v", err)
+	}
+}