github.com/demonoid81/containerd@v1.3.4/cmd/ctr/commands/images/tag.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 images
    18  
    19  import (
    20  	"fmt"
    21  
    22  	"github.com/containerd/containerd/cmd/ctr/commands"
    23  	"github.com/containerd/containerd/errdefs"
    24  	"github.com/urfave/cli"
    25  )
    26  
    27  var tagCommand = cli.Command{
    28  	Name:        "tag",
    29  	Usage:       "tag an image",
    30  	ArgsUsage:   "[flags] <source_ref> <target_ref> [<target_ref>, ...]",
    31  	Description: `Tag an image for use in containerd.`,
    32  	Flags: []cli.Flag{
    33  		cli.BoolFlag{
    34  			Name:  "force",
    35  			Usage: "force target_ref to be created, regardless if it already exists",
    36  		},
    37  	},
    38  	Action: func(context *cli.Context) error {
    39  		var (
    40  			ref = context.Args().First()
    41  		)
    42  		if ref == "" {
    43  			return fmt.Errorf("please provide an image reference to tag from")
    44  		}
    45  		if context.NArg() <= 1 {
    46  			return fmt.Errorf("please provide an image reference to tag to")
    47  		}
    48  
    49  		client, ctx, cancel, err := commands.NewClient(context)
    50  		if err != nil {
    51  			return err
    52  		}
    53  		defer cancel()
    54  
    55  		ctx, done, err := client.WithLease(ctx)
    56  		if err != nil {
    57  			return err
    58  		}
    59  		defer done(ctx)
    60  
    61  		imageService := client.ImageService()
    62  		image, err := imageService.Get(ctx, ref)
    63  		if err != nil {
    64  			return err
    65  		}
    66  		// Support multiple references for one command run
    67  		for _, targetRef := range context.Args()[1:] {
    68  			image.Name = targetRef
    69  			// Attempt to create the image first
    70  			if _, err = imageService.Create(ctx, image); err != nil {
    71  				// If user has specified force and the image already exists then
    72  				// delete the original image and attempt to create the new one
    73  				if errdefs.IsAlreadyExists(err) && context.Bool("force") {
    74  					if err = imageService.Delete(ctx, targetRef); err != nil {
    75  						return err
    76  					}
    77  					if _, err = imageService.Create(ctx, image); err != nil {
    78  						return err
    79  					}
    80  				} else {
    81  					return err
    82  				}
    83  			}
    84  			fmt.Println(targetRef)
    85  		}
    86  		return nil
    87  	},
    88  }