vendor/github.com/fsouza/go-dockerclient/external/github.com/docker/docker/opts/ip.go

   1 package opts
   2
   3 import (
   4         "fmt"
   5         "net"
   6 )
   7
   8 // IPOpt holds an IP. It is used to store values from CLI flags.
   9 type IPOpt struct {
  10         *net.IP
  11 }
  12
  13 // NewIPOpt creates a new IPOpt from a reference net.IP and a
  14 // string representation of an IP. If the string is not a valid
  15 // IP it will fallback to the specified reference.
  16 func NewIPOpt(ref *net.IP, defaultVal string) *IPOpt {
  17         o := &IPOpt{
  18                 IP: ref,
  19         }
  20         o.Set(defaultVal)
  21         return o
  22 }
  23
  24 // Set sets an IPv4 or IPv6 address from a given string. If the given
  25 // string is not parseable as an IP address it returns an error.
  26 func (o *IPOpt) Set(val string) error {
  27         ip := net.ParseIP(val)
  28         if ip == nil {
  29                 return fmt.Errorf("%s is not an ip address", val)
  30         }
  31         *o.IP = ip
  32         return nil
  33 }
  34
  35 // String returns the IP address stored in the IPOpt. If stored IP is a
  36 // nil pointer, it returns an empty string.
  37 func (o *IPOpt) String() string {
  38         if *o.IP == nil {
  39                 return ""
  40         }
  41         return o.IP.String()
  42 }