package docker
 

 // Compare two Config struct. Do not compare the "Image" nor "Hostname" fields
 // If OpenStdin is set, then it differs
 func CompareConfig(a, b *Config) bool {
 	if a == nil || b == nil ||
 		a.OpenStdin || b.OpenStdin {
 		return false
 	}
 	if a.AttachStdout != b.AttachStdout ||
 		a.AttachStderr != b.AttachStderr ||
 		a.User != b.User ||
 		a.Memory != b.Memory ||
 		a.MemorySwap != b.MemorySwap ||

 		a.CpuShares != b.CpuShares ||

 		a.OpenStdin != b.OpenStdin ||
 		a.Tty != b.Tty {
 		return false
 	}
 	if len(a.Cmd) != len(b.Cmd) ||
 		len(a.Dns) != len(b.Dns) ||
 		len(a.Env) != len(b.Env) ||
 		len(a.PortSpecs) != len(b.PortSpecs) {
 		return false
 	}
 
 	for i := 0; i < len(a.Cmd); i++ {
 		if a.Cmd[i] != b.Cmd[i] {
 			return false
 		}
 	}
 	for i := 0; i < len(a.Dns); i++ {
 		if a.Dns[i] != b.Dns[i] {
 			return false
 		}
 	}
 	for i := 0; i < len(a.Env); i++ {
 		if a.Env[i] != b.Env[i] {
 			return false
 		}
 	}
 	for i := 0; i < len(a.PortSpecs); i++ {
 		if a.PortSpecs[i] != b.PortSpecs[i] {
 			return false
 		}
 	}
 
 	return true
 }

 
 func MergeConfig(userConf, imageConf *Config) {

 	if userConf.Hostname == "" {

 		userConf.Hostname = imageConf.Hostname
 	}

 	if userConf.User == "" {

 		userConf.User = imageConf.User
 	}
 	if userConf.Memory == 0 {
 		userConf.Memory = imageConf.Memory
 	}
 	if userConf.MemorySwap == 0 {
 		userConf.MemorySwap = imageConf.MemorySwap
 	}
 	if userConf.CpuShares == 0 {
 		userConf.CpuShares = imageConf.CpuShares
 	}
 	if userConf.PortSpecs == nil || len(userConf.PortSpecs) == 0 {
 		userConf.PortSpecs = imageConf.PortSpecs
 	}
 	if !userConf.Tty {
 		userConf.Tty = imageConf.Tty
 	}
 	if !userConf.OpenStdin {
 		userConf.OpenStdin = imageConf.OpenStdin
 	}
 	if !userConf.StdinOnce {
 		userConf.StdinOnce = imageConf.StdinOnce
 	}
 	if userConf.Env == nil || len(userConf.Env) == 0 {
 		userConf.Env = imageConf.Env
 	}
 	if userConf.Cmd == nil || len(userConf.Cmd) == 0 {
 		userConf.Cmd = imageConf.Cmd
 	}
 	if userConf.Dns == nil || len(userConf.Dns) == 0 {
 		userConf.Dns = imageConf.Dns
 	}
 }