In a small bowl, whisk the soy sauce with the hoisin and vinegar. Heat a wok or large skillet. Add the oil and heat until smoking. Add the pork and Chinese sausages and cook over high heat, stirring, until the pork is lightly browned, about 2 minutes. Add the minced scallion whites, ginger, garlic and chile and cook until fragrant, about 1 minute. Add the rice, breaking up any lumps with your hands as you add it to the wok, and stir-fry until heated through and lightly browned in spots. Stir the hoisin-soy sauce, add it to the wok and stir-fry until nearly absorbed, about 2 minutes. Stir in the scallion greens, cilantro and pineapple. Transfer the fried rice to bowls and serve.