github.com/containerd/nerdctl@v1.7.7/pkg/maputil/maputil.go (about)

     1  /*
     2     Copyright The containerd Authors.
     3  
     4     Licensed under the Apache License, Version 2.0 (the "License");
     5     you may not use this file except in compliance with the License.
     6     You may obtain a copy of the License at
     7  
     8         http://www.apache.org/licenses/LICENSE-2.0
     9  
    10     Unless required by applicable law or agreed to in writing, software
    11     distributed under the License is distributed on an "AS IS" BASIS,
    12     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13     See the License for the specific language governing permissions and
    14     limitations under the License.
    15  */
    16  
    17  package maputil
    18  
    19  import (
    20  	"fmt"
    21  	"strconv"
    22  )
    23  
    24  // MapBoolValueAsOpt will parse key as a command-line option.
    25  // If only key is specified will be treated as true,
    26  // otherwise, the value will be parsed and returned.
    27  // This is useful when command line flags have options.
    28  // Following examples illustrate this:
    29  // --security-opt xxx returns true
    30  // --security-opt xxx=true returns true
    31  // --security-opt xxx=false returns false
    32  // --security-opt xxx=invalid returns false and error
    33  func MapBoolValueAsOpt(m map[string]string, key string) (bool, error) {
    34  	if str, ok := m[key]; ok {
    35  		if str == "" {
    36  			return true, nil
    37  		}
    38  		b, err := strconv.ParseBool(str)
    39  		if err != nil {
    40  			return false, fmt.Errorf("invalid \"%s\" value: %q: %w", key, str, err)
    41  		}
    42  		return b, nil
    43  	}
    44  
    45  	return false, nil
    46  }