From d0c776528b50f884c970cf0563ef6b40d90efc44 Mon Sep 17 00:00:00 2001
From: Solomon Hykes <solomon@dotcloud.com>
Date: Thu, 21 Mar 2013 19:00:43 -0700
Subject: [PATCH] Fix a bug which caused repository metadata to be cleared at
 startup

---
 tags.go | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tags.go b/tags.go
index 908691a8f9..55a5135860 100644
--- a/tags.go
+++ b/tags.go
@@ -3,6 +3,7 @@ package docker
 import (
 	"encoding/json"
 	"io/ioutil"
+	"os"
 	"path/filepath"
 )
 
@@ -24,7 +25,12 @@ func NewTagStore(path string, graph *Graph) (*TagStore, error) {
 		graph:        graph,
 		Repositories: make(map[string]Repository),
 	}
-	if err := store.Save(); err != nil {
+	// Load the json file if it exists, otherwise create it.
+	if err := store.Reload(); os.IsNotExist(err) {
+		if err := store.Save(); err != nil {
+			return nil, err
+		}
+	} else if err != nil {
 		return nil, err
 	}
 	return store, nil