1 // Copyright 2015 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 osutil implements operating system-related utility functions. 16 package osutil 17 18 import ( 19 "os" 20 "strings" 21 ) 22 23 var ( 24 // support to override setting SIG_DFL so tests don't terminate early 25 setDflSignal = dflSignal 26 ) 27 28 func Unsetenv(key string) error { 29 envs := os.Environ() 30 os.Clearenv() 31 for _, e := range envs { 32 strs := strings.SplitN(e, "=", 2) 33 if strs[0] == key { 34 continue 35 } 36 if err := os.Setenv(strs[0], strs[1]); err != nil { 37 return err 38 } 39 } 40 return nil 41 } 42