Verify the added device contents

Signed-off-by: zhouhao <zhouhao@cn.fujitsu.com>

Author: zhouhao

generate/generate.go

@@ -918,6 +918,16 @@ func (g *Generator) RemoveLinuxNamespace(ns string) error {
 func (g *Generator) AddDevice(device rspec.Device) {
 	g.initSpecLinux()
 
+	for i, dev := range g.spec.Linux.Devices {
+		if dev.Path == device.Path {
+			g.spec.Linux.Devices[i] = device
+			return
+		}
+		if dev.Type == device.Type && dev.Major == device.Major && dev.Minor == device.Minor {
+			fmt.Println("WARNING: The same type, major and minor should not be used for multiple devices.")
+		}
+	}
+
 	g.spec.Linux.Devices = append(g.spec.Linux.Devices, device)
 }