From 64450ae3f89b8f9b5288224c5a7d109a166cf22a Mon Sep 17 00:00:00 2001
From: Victor Vieux <victor.vieux@dotcloud.com>
Date: Wed, 3 Jul 2013 17:11:00 +0000
Subject: [PATCH] add last version

---
 commands.go    |  9 +++++++++
 utils/utils.go | 22 ++++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/commands.go b/commands.go
index 6e1e5e88c2..e275bdd671 100644
--- a/commands.go
+++ b/commands.go
@@ -407,6 +407,15 @@ func (cli *DockerCli) CmdVersion(args ...string) error {
 	if out.GoVersion != "" {
 		fmt.Fprintf(cli.out, "Go version: %s\n", out.GoVersion)
 	}
+
+	release := utils.GetReleaseVersion()
+	if release != "" {
+		fmt.Fprintf(cli.out, "Last stable version: %s", release)
+		if VERSION != release || out.Version != release {
+			fmt.Fprintf(cli.out, ", please update docker")
+		}
+		fmt.Fprintf(cli.out, "\n")
+	}
 	return nil
 }
 
diff --git a/utils/utils.go b/utils/utils.go
index 2f2a52867e..b4a41ea420 100644
--- a/utils/utils.go
+++ b/utils/utils.go
@@ -687,3 +687,25 @@ func ParseHost(host string, port int, addr string) string {
 	}
 	return fmt.Sprintf("tcp://%s:%d", host, port)
 }
+
+func GetReleaseVersion() string {
+	type githubTag struct {
+		Name string `json:"name"`
+	}
+
+	resp, err := http.Get("https://api.github.com/repos/dotcloud/docker/tags")
+	if err != nil {
+		return ""
+	}
+	defer resp.Body.Close()
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return ""
+	}
+	var tags []githubTag
+	err = json.Unmarshal(body, &tags)
+	if err != nil || len(tags) == 0 {
+		return ""
+	}
+	return strings.TrimPrefix(tags[0].Name, "v")
+}