@@ -307,6 +307,12 @@ func (cli *DockerCli) CmdBuild(args ...string) error {

 	return nil

 }

+// isUNC returns true if the path is UNC (one starting \\). It always returns

+// false on Linux.

+func isUNC(path string) bool {

+	return runtime.GOOS == "windows" && strings.HasPrefix(path, `\\`)

+}

+

 // getDockerfileRelPath uses the given context directory for a `docker build`

 // and returns the absolute path to the context directory, the relative path of

 // the dockerfile in that context directory, and a non-nil error on success.

@@ -317,9 +323,16 @@ func getDockerfileRelPath(givenContextDir, givenDockerfile string) (absContextDi

 	// The context dir might be a symbolic link, so follow it to the actual

 	// target directory.

-	absContextDir, err = filepath.EvalSymlinks(absContextDir)

-	if err != nil {

-		return "", "", fmt.Errorf("unable to evaluate symlinks in context path: %v", err)

+	//

+	// FIXME. We use isUNC (always false on non-Windows platforms) to workaround

+	// an issue in golang. On Windows, EvalSymLinks does not work on UNC file

+	// paths (those starting with \\). This hack means that when using links

+	// on UNC paths, they will not be followed.

+	if !isUNC(absContextDir) {

+		absContextDir, err = filepath.EvalSymlinks(absContextDir)

+		if err != nil {

+			return "", "", fmt.Errorf("unable to evaluate symlinks in context path: %v", err)

+		}

 	}

 	stat, err := os.Lstat(absContextDir)

@@ -354,9 +367,16 @@ func getDockerfileRelPath(givenContextDir, givenDockerfile string) (absContextDi

 	}

 	// Evaluate symlinks in the path to the Dockerfile too.

-	absDockerfile, err = filepath.EvalSymlinks(absDockerfile)

-	if err != nil {

-		return "", "", fmt.Errorf("unable to evaluate symlinks in Dockerfile path: %v", err)

+	//

+	// FIXME. We use isUNC (always false on non-Windows platforms) to workaround

+	// an issue in golang. On Windows, EvalSymLinks does not work on UNC file

+	// paths (those starting with \\). This hack means that when using links

+	// on UNC paths, they will not be followed.

+	if !isUNC(absDockerfile) {

+		absDockerfile, err = filepath.EvalSymlinks(absDockerfile)

+		if err != nil {

+			return "", "", fmt.Errorf("unable to evaluate symlinks in Dockerfile path: %v", err)

+		}

 	}

 	if _, err := os.Lstat(absDockerfile); err != nil {