func buildCrypt(c *cli.Context) (*crypt.Crypt, error) {
if role := c.GlobalString("role"); role != "" {
return crypt.NewIam(role)
} else {
region := c.GlobalString("region")
access := c.GlobalString("access")
secret := c.GlobalString("secret")
return crypt.New(region, access, secret), nil
}
}