github.com/containerd/nerdctl/v2@v2.0.0-beta.5.0.20240520001846-b5758f54fa28/pkg/cmd/container/wait.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  	"errors"
    22  	"fmt"
    23  	"io"
    24  
    25  	"github.com/containerd/containerd"
    26  	"github.com/containerd/nerdctl/v2/pkg/api/types"
    27  	"github.com/containerd/nerdctl/v2/pkg/idutil/containerwalker"
    28  )
    29  
    30  // Wait blocks until all the containers specified by reqs have stopped, then print their exit codes.
    31  func Wait(ctx context.Context, client *containerd.Client, reqs []string, options types.ContainerWaitOptions) error {
    32  	var containers []containerd.Container
    33  	walker := &containerwalker.ContainerWalker{
    34  		Client: client,
    35  		OnFound: func(ctx context.Context, found containerwalker.Found) error {
    36  			if found.MatchCount > 1 {
    37  				return fmt.Errorf("multiple IDs found with provided prefix: %s", found.Req)
    38  			}
    39  			containers = append(containers, found.Container)
    40  			return nil
    41  		},
    42  	}
    43  
    44  	// check if all containers from `reqs` exist
    45  	if err := walker.WalkAll(ctx, reqs, false); err != nil {
    46  		return err
    47  	}
    48  
    49  	var errs []error
    50  	w := options.Stdout
    51  	for _, container := range containers {
    52  		if waitErr := waitContainer(ctx, w, container); waitErr != nil {
    53  			errs = append(errs, waitErr)
    54  		}
    55  	}
    56  	return errors.Join(errs...)
    57  }
    58  
    59  func waitContainer(ctx context.Context, w io.Writer, container containerd.Container) error {
    60  	task, err := container.Task(ctx, nil)
    61  	if err != nil {
    62  		return err
    63  	}
    64  
    65  	statusC, err := task.Wait(ctx)
    66  	if err != nil {
    67  		return err
    68  	}
    69  
    70  	status := <-statusC
    71  	code, _, err := status.Result()
    72  	if err != nil {
    73  		return err
    74  	}
    75  	fmt.Fprintln(w, code)
    76  	return nil
    77  }