github.com/containerd/nerdctl@v1.7.7/pkg/cmd/container/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 container
    18  
    19  import (
    20  	"context"
    21  	"fmt"
    22  	"os"
    23  	"strings"
    24  	"syscall"
    25  
    26  	"github.com/containerd/containerd"
    27  	"github.com/containerd/containerd/cio"
    28  	"github.com/containerd/errdefs"
    29  	"github.com/containerd/log"
    30  	"github.com/containerd/nerdctl/pkg/api/types"
    31  	"github.com/containerd/nerdctl/pkg/containerutil"
    32  	"github.com/containerd/nerdctl/pkg/idutil/containerwalker"
    33  	"github.com/moby/sys/signal"
    34  )
    35  
    36  // Kill kills a list of containers
    37  func Kill(ctx context.Context, client *containerd.Client, reqs []string, options types.ContainerKillOptions) error {
    38  	if !strings.HasPrefix(options.KillSignal, "SIG") {
    39  		options.KillSignal = "SIG" + options.KillSignal
    40  	}
    41  
    42  	parsedSignal, err := signal.ParseSignal(options.KillSignal)
    43  	if err != nil {
    44  		return err
    45  	}
    46  
    47  	walker := &containerwalker.ContainerWalker{
    48  		Client: client,
    49  		OnFound: func(ctx context.Context, found containerwalker.Found) error {
    50  			if found.MatchCount > 1 {
    51  				return fmt.Errorf("multiple IDs found with provided prefix: %s", found.Req)
    52  			}
    53  			if err := killContainer(ctx, found.Container, parsedSignal); err != nil {
    54  				if errdefs.IsNotFound(err) {
    55  					fmt.Fprintf(options.Stderr, "No such container: %s\n", found.Req)
    56  					os.Exit(1)
    57  				}
    58  				return err
    59  			}
    60  			_, err := fmt.Fprintln(options.Stdout, found.Container.ID())
    61  			return err
    62  		},
    63  	}
    64  
    65  	return walker.WalkAll(ctx, reqs, true)
    66  }
    67  
    68  func killContainer(ctx context.Context, container containerd.Container, signal syscall.Signal) (err error) {
    69  	defer func() {
    70  		if err != nil {
    71  			containerutil.UpdateErrorLabel(ctx, container, err)
    72  		}
    73  	}()
    74  	if err := containerutil.UpdateExplicitlyStoppedLabel(ctx, container, true); err != nil {
    75  		return err
    76  	}
    77  	task, err := container.Task(ctx, cio.Load)
    78  	if err != nil {
    79  		return err
    80  	}
    81  
    82  	status, err := task.Status(ctx)
    83  	if err != nil {
    84  		return err
    85  	}
    86  
    87  	paused := false
    88  
    89  	switch status.Status {
    90  	case containerd.Created, containerd.Stopped:
    91  		return fmt.Errorf("cannot kill container %s: container is not running", container.ID())
    92  	case containerd.Paused, containerd.Pausing:
    93  		paused = true
    94  	default:
    95  	}
    96  
    97  	if err := task.Kill(ctx, signal); err != nil {
    98  		return err
    99  	}
   100  
   101  	// signal will be sent once resume is finished
   102  	if paused {
   103  		if err := task.Resume(ctx); err != nil {
   104  			log.G(ctx).Warnf("cannot unpause container %s: %s", container.ID(), err)
   105  		}
   106  	}
   107  	return nil
   108  }