github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/runsc/cmd/pause.go (about)

     1  // Copyright 2018 The gVisor 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 cmd
    16  
    17  import (
    18  	"context"
    19  
    20  	"github.com/google/subcommands"
    21  	"github.com/SagerNet/gvisor/runsc/config"
    22  	"github.com/SagerNet/gvisor/runsc/container"
    23  	"github.com/SagerNet/gvisor/runsc/flag"
    24  )
    25  
    26  // Pause implements subcommands.Command for the "pause" command.
    27  type Pause struct{}
    28  
    29  // Name implements subcommands.Command.Name.
    30  func (*Pause) Name() string {
    31  	return "pause"
    32  }
    33  
    34  // Synopsis implements subcommands.Command.Synopsis.
    35  func (*Pause) Synopsis() string {
    36  	return "pause suspends all processes in a container"
    37  }
    38  
    39  // Usage implements subcommands.Command.Usage.
    40  func (*Pause) Usage() string {
    41  	return `pause <container id> - pause process in instance of container.`
    42  }
    43  
    44  // SetFlags implements subcommands.Command.SetFlags.
    45  func (*Pause) SetFlags(f *flag.FlagSet) {
    46  }
    47  
    48  // Execute implements subcommands.Command.Execute.
    49  func (*Pause) Execute(_ context.Context, f *flag.FlagSet, args ...interface{}) subcommands.ExitStatus {
    50  	if f.NArg() != 1 {
    51  		f.Usage()
    52  		return subcommands.ExitUsageError
    53  	}
    54  
    55  	id := f.Arg(0)
    56  	conf := args[0].(*config.Config)
    57  
    58  	cont, err := container.Load(conf.RootDir, container.FullID{ContainerID: id}, container.LoadOpts{})
    59  	if err != nil {
    60  		Fatalf("loading container: %v", err)
    61  	}
    62  
    63  	if err := cont.Pause(); err != nil {
    64  		Fatalf("pause failed: %v", err)
    65  	}
    66  
    67  	return subcommands.ExitSuccess
    68  }