package v2 // import "github.com/docker/docker/plugin/v2" import ( "errors" "fmt" "strings" ) type settable struct { name string field string value string } var ( allowedSettableFieldsEnv = []string{"value"} allowedSettableFieldsArgs = []string{"value"} allowedSettableFieldsDevices = []string{"path"} allowedSettableFieldsMounts = []string{"source"} errMultipleFields = errors.New("multiple fields are settable, one must be specified") errInvalidFormat = errors.New("invalid format, must be [.][=]") ) func newSettables(args []string) ([]settable, error) { sets := make([]settable, 0, len(args)) for _, arg := range args { set, err := newSettable(arg) if err != nil { return nil, err } sets = append(sets, set) } return sets, nil } func newSettable(arg string) (settable, error) { var set settable if i := strings.Index(arg, "="); i == 0 { return set, errInvalidFormat } else if i < 0 { set.name = arg } else { set.name = arg[:i] set.value = arg[i+1:] } if i := strings.LastIndex(set.name, "."); i > 0 { set.field = set.name[i+1:] set.name = arg[:i] } return set, nil } // prettyName return name.field if there is a field, otherwise name. func (set *settable) prettyName() string { if set.field != "" { return fmt.Sprintf("%s.%s", set.name, set.field) } return set.name } func (set *settable) isSettable(allowedSettableFields []string, settable []string) (bool, error) { if set.field == "" { if len(settable) == 1 { // if field is not specified and there only one settable, default to it. set.field = settable[0] } else if len(settable) > 1 { return false, errMultipleFields } } isAllowed := false for _, allowedSettableField := range allowedSettableFields { if set.field == allowedSettableField { isAllowed = true break } } if isAllowed { for _, settableField := range settable { if set.field == settableField { return true, nil } } } return false, nil } func updateSettingsEnv(env *[]string, set *settable) { for i, e := range *env { if parts := strings.SplitN(e, "=", 2); parts[0] == set.name { (*env)[i] = fmt.Sprintf("%s=%s", set.name, set.value) return } } *env = append(*env, fmt.Sprintf("%s=%s", set.name, set.value)) }