type EnvInfoer interface {
	// User returns the current user.
	User() (*user.User, error)
	// Environ returns the environment variables of the current process.
	Environ() []string
	// HomeDir returns the home directory of the current user.
	HomeDir() (string, error)
	// Shell returns the shell of the given user.
	Shell(username string) (string, error)
	// ModifyCommand modifies the command and arguments before execution based on
	// the environment. This is useful for executing a command inside a container.
	// In the default case, the command and arguments are returned unchanged.
	ModifyCommand(name string, args ...string) (string, []string)
}

type SystemEnvInfo struct{}