github.com/vmware/govmomi@v0.43.0/govc/env/command.go (about)

     1  /*
     2  Copyright (c) 2016 VMware, Inc. All Rights Reserved.
     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 env
    18  
    19  import (
    20  	"context"
    21  	"flag"
    22  	"fmt"
    23  	"io"
    24  	"strings"
    25  
    26  	"github.com/vmware/govmomi/govc/cli"
    27  	"github.com/vmware/govmomi/govc/flags"
    28  )
    29  
    30  type env struct {
    31  	*flags.OutputFlag
    32  	*flags.ClientFlag
    33  
    34  	extra bool
    35  }
    36  
    37  func init() {
    38  	cli.Register("env", &env{})
    39  }
    40  
    41  func (cmd *env) Register(ctx context.Context, f *flag.FlagSet) {
    42  	cmd.OutputFlag, ctx = flags.NewOutputFlag(ctx)
    43  	cmd.OutputFlag.Register(ctx, f)
    44  
    45  	cmd.ClientFlag, ctx = flags.NewClientFlag(ctx)
    46  	cmd.ClientFlag.Register(ctx, f)
    47  
    48  	f.BoolVar(&cmd.extra, "x", false, "Output variables for each GOVC_URL component")
    49  }
    50  
    51  func (cmd *env) Process(ctx context.Context) error {
    52  	if err := cmd.OutputFlag.Process(ctx); err != nil {
    53  		return err
    54  	}
    55  	if err := cmd.ClientFlag.Process(ctx); err != nil {
    56  		return err
    57  	}
    58  	return nil
    59  }
    60  
    61  func (cmd *env) Description() string {
    62  	return `Output the environment variables for this client.
    63  
    64  If credentials are included in the url, they are split into separate variables.
    65  Useful as bash scripting helper to parse GOVC_URL.`
    66  }
    67  
    68  func (cmd *env) Run(ctx context.Context, f *flag.FlagSet) error {
    69  	env := envResult(cmd.ClientFlag.Environ(cmd.extra))
    70  
    71  	if f.NArg() > 1 {
    72  		return flag.ErrHelp
    73  	}
    74  
    75  	// Option to just output the value, example use:
    76  	// password=$(govc env GOVC_PASSWORD)
    77  	if f.NArg() == 1 {
    78  		var output []string
    79  
    80  		prefix := fmt.Sprintf("%s=", f.Arg(0))
    81  
    82  		for _, e := range env {
    83  			if strings.HasPrefix(e, prefix) {
    84  				output = append(output, e[len(prefix):])
    85  				break
    86  			}
    87  		}
    88  
    89  		return cmd.WriteResult(envResult(output))
    90  	}
    91  
    92  	return cmd.WriteResult(env)
    93  }
    94  
    95  type envResult []string
    96  
    97  func (r envResult) Write(w io.Writer) error {
    98  	for _, e := range r {
    99  		fmt.Println(e)
   100  	}
   101  
   102  	return nil
   103  }