From 90dde9beabcac3874a274f9f7952f25ba8c1c7a3 Mon Sep 17 00:00:00 2001
From: Solomon Hykes <solomon@dotcloud.com>
Date: Wed, 19 Jun 2013 14:59:28 -0700
Subject: [PATCH] *Builder: warn pre-1.3 clients that they need to upgrade.
 This breaks semver, but our API should still be in 0.X versioning, in which
 case semver allows breaking changes.

---
 api.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/api.go b/api.go
index 563888c6b..1aa46e6b3 100644
--- a/api.go
+++ b/api.go
@@ -715,6 +715,9 @@ func postImagesGetCache(srv *Server, version float64, w http.ResponseWriter, r *
 }
 
 func postBuild(srv *Server, version float64, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
+	if version < 1.3 {
+		return fmt.Errorf("Multipart upload for build is no longer supported. Please upgrade your docker client.")
+	}
 	// FIXME: "remote" is not a clear variable name.
 	remote := r.FormValue("t")
 	tag := ""