go.etcd.io/etcd@v3.3.27+incompatible/pkg/osutil/osutil.go (about)

     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  	"github.com/coreos/pkg/capnslog"
    23  )
    24  
    25  var (
    26  	plog = capnslog.NewPackageLogger("github.com/coreos/etcd", "pkg/osutil")
    27  
    28  	// support to override setting SIG_DFL so tests don't terminate early
    29  	setDflSignal = dflSignal
    30  )
    31  
    32  func Unsetenv(key string) error {
    33  	envs := os.Environ()
    34  	os.Clearenv()
    35  	for _, e := range envs {
    36  		strs := strings.SplitN(e, "=", 2)
    37  		if strs[0] == key {
    38  			continue
    39  		}
    40  		if err := os.Setenv(strs[0], strs[1]); err != nil {
    41  			return err
    42  		}
    43  	}
    44  	return nil
    45  }