// NewController returns a localkube Docker client from a created *docker.Client
func NewController(client *docker.Client, out io.Writer) (*Controller, error) {
_, err := client.Version()
if err != nil {
return nil, fmt.Errorf("Unable to establish connection with Docker daemon: %v", err)
}
logger := log.New(out, "", 0)
return &Controller{
Client: client,
log: logger,
out: out,
}, nil
}
func checkForMinimalDockerVersion(c *docker.Client) (string, error) {
env, err := c.Version()
if err != nil {
return "", err
}
m := env.Map()
version := m["Version"]
arr := strings.Split(version, ".")
if len(arr) < 2 {
return "", fmt.Errorf("unparsable version string: %s", version)
}
major, err := strconv.Atoi(arr[0])
if err != nil {
return "", fmt.Errorf("unparsable major version: %s", version)
}
minor, err := strconv.Atoi(arr[1])
if err != nil {
return "", fmt.Errorf("unparsable minor version: %s", version)
}
if major*1000+minor < minimalDockerVersion {
return "", fmt.Errorf("unusably old Docker version: %s", version)
}
return version, nil
}