Function getUserFromImageUser

core/image.go:253–267

getUserFromImageUser gets uid or user name of the image user. If user is numeric, it will be treated as uid; or else, it is treated as user name.

(imageUser string)

// getUserFromImageUser gets uid or user name of the image user.
// If user is numeric, it will be treated as uid; or else, it is treated as user name.
func getUserFromImageUser(imageUser string) (*int64, string) {
	user := parseUserFromImageUser(imageUser)
	// return both nil if user is not specified in the image.
	if user == "" {
		return nil, ""
	}
	// user could be either uid or user name. Try to interpret as numeric uid.
	uid, err := strconv.ParseInt(user, 10, 64)
	if err != nil {
		// If user is non numeric, assume it's user name.
		return nil, user
	}
	// If user is a numeric uid.
	return &uid, ""
}