1 // Copyright 2018 The etcd Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package flags 16 17 import "go.uber.org/zap" 18 19 // IgnoredFlag encapsulates a flag that may have been previously valid but is 20 // now ignored. If an IgnoredFlag is set, a warning is printed and 21 // operation continues. 22 type IgnoredFlag struct { 23 lg *zap.Logger 24 Name string 25 } 26 27 // IsBoolFlag is defined to allow the flag to be defined without an argument 28 func (f *IgnoredFlag) IsBoolFlag() bool { 29 return true 30 } 31 32 func (f *IgnoredFlag) Set(s string) error { 33 if f.lg != nil { 34 f.lg.Warn("flag is no longer supported - ignoring", zap.String("flag-name", f.Name)) 35 } 36 return nil 37 } 38 39 func (f *IgnoredFlag) String() string { 40 return "" 41 } 42