github.com/containerd/containerd@v22.0.0-20200918172823-438c87b8e050+incompatible/cmd/ctr/commands/tasks/kill.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 tasks
    18  
    19  import (
    20  	"github.com/containerd/containerd"
    21  	"github.com/containerd/containerd/cmd/ctr/commands"
    22  	"github.com/pkg/errors"
    23  	"github.com/urfave/cli"
    24  )
    25  
    26  const defaultSignal = "SIGTERM"
    27  
    28  var killCommand = cli.Command{
    29  	Name:      "kill",
    30  	Usage:     "signal a container (default: SIGTERM)",
    31  	ArgsUsage: "[flags] CONTAINER",
    32  	Flags: []cli.Flag{
    33  		cli.StringFlag{
    34  			Name:  "signal, s",
    35  			Value: "",
    36  			Usage: "signal to send to the container",
    37  		},
    38  		cli.StringFlag{
    39  			Name:  "exec-id",
    40  			Usage: "process ID to kill",
    41  		},
    42  		cli.BoolFlag{
    43  			Name:  "all, a",
    44  			Usage: "send signal to all processes inside the container",
    45  		},
    46  	},
    47  	Action: func(context *cli.Context) error {
    48  		id := context.Args().First()
    49  		if id == "" {
    50  			return errors.New("container id must be provided")
    51  		}
    52  		signal, err := containerd.ParseSignal(defaultSignal)
    53  		if err != nil {
    54  			return err
    55  		}
    56  		var (
    57  			all    = context.Bool("all")
    58  			execID = context.String("exec-id")
    59  			opts   []containerd.KillOpts
    60  		)
    61  		if all && execID != "" {
    62  			return errors.New("specify an exec-id or all; not both")
    63  		}
    64  		client, ctx, cancel, err := commands.NewClient(context)
    65  		if err != nil {
    66  			return err
    67  		}
    68  		defer cancel()
    69  		if all {
    70  			opts = append(opts, containerd.WithKillAll)
    71  		}
    72  		if execID != "" {
    73  			opts = append(opts, containerd.WithKillExecID(execID))
    74  		}
    75  		container, err := client.LoadContainer(ctx, id)
    76  		if err != nil {
    77  			return err
    78  		}
    79  		if context.String("signal") != "" {
    80  			signal, err = containerd.ParseSignal(context.String("signal"))
    81  			if err != nil {
    82  				return err
    83  			}
    84  		} else {
    85  			signal, err = containerd.GetStopSignal(ctx, container, signal)
    86  			if err != nil {
    87  				return err
    88  			}
    89  		}
    90  		task, err := container.Task(ctx, nil)
    91  		if err != nil {
    92  			return err
    93  		}
    94  		return task.Kill(ctx, signal, opts...)
    95  	},
    96  }