github.com/vmware/govmomi@v0.37.1/govc/flags/virtual_app.go (about)

     1  /*
     2  Copyright (c) 2015 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 flags
    18  
    19  import (
    20  	"context"
    21  	"flag"
    22  	"fmt"
    23  	"os"
    24  
    25  	"github.com/vmware/govmomi/object"
    26  )
    27  
    28  type VirtualAppFlag struct {
    29  	common
    30  
    31  	*DatacenterFlag
    32  	*SearchFlag
    33  
    34  	name string
    35  	app  *object.VirtualApp
    36  }
    37  
    38  var virtualAppFlagKey = flagKey("virtualApp")
    39  
    40  func NewVirtualAppFlag(ctx context.Context) (*VirtualAppFlag, context.Context) {
    41  	if v := ctx.Value(virtualAppFlagKey); v != nil {
    42  		return v.(*VirtualAppFlag), ctx
    43  	}
    44  
    45  	v := &VirtualAppFlag{}
    46  	v.DatacenterFlag, ctx = NewDatacenterFlag(ctx)
    47  	v.SearchFlag, ctx = NewSearchFlag(ctx, SearchVirtualApps)
    48  	ctx = context.WithValue(ctx, virtualAppFlagKey, v)
    49  	return v, ctx
    50  }
    51  
    52  func (flag *VirtualAppFlag) Register(ctx context.Context, f *flag.FlagSet) {
    53  	flag.RegisterOnce(func() {
    54  		flag.DatacenterFlag.Register(ctx, f)
    55  		flag.SearchFlag.Register(ctx, f)
    56  
    57  		env := "GOVC_VAPP"
    58  		value := os.Getenv(env)
    59  		usage := fmt.Sprintf("Virtual App [%s]", env)
    60  		f.StringVar(&flag.name, "vapp", value, usage)
    61  	})
    62  }
    63  
    64  func (flag *VirtualAppFlag) Process(ctx context.Context) error {
    65  	return flag.ProcessOnce(func() error {
    66  		if err := flag.DatacenterFlag.Process(ctx); err != nil {
    67  			return err
    68  		}
    69  		if err := flag.SearchFlag.Process(ctx); err != nil {
    70  			return err
    71  		}
    72  		return nil
    73  	})
    74  }
    75  
    76  func (flag *VirtualAppFlag) VirtualApp() (*object.VirtualApp, error) {
    77  	ctx := context.TODO()
    78  
    79  	if flag.app != nil {
    80  		return flag.app, nil
    81  	}
    82  
    83  	// Use search flags if specified.
    84  	if flag.SearchFlag.IsSet() {
    85  		app, err := flag.SearchFlag.VirtualApp()
    86  		if err != nil {
    87  			return nil, err
    88  		}
    89  
    90  		flag.app = app
    91  		return flag.app, nil
    92  	}
    93  
    94  	// Never look for a default virtual app.
    95  	if flag.name == "" {
    96  		return nil, nil
    97  	}
    98  
    99  	finder, err := flag.Finder()
   100  	if err != nil {
   101  		return nil, err
   102  	}
   103  
   104  	flag.app, err = finder.VirtualApp(ctx, flag.name)
   105  	return flag.app, err
   106  }