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pull.go
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pull.go
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/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package images
import (
"fmt"
"github.com/containerd/containerd/cmd/ctr/commands"
"github.com/containerd/containerd/cmd/ctr/commands/content"
"github.com/containerd/containerd/log"
"github.com/containerd/containerd/platforms"
"github.com/urfave/cli"
)
var pullCommand = cli.Command{
Name: "pull",
Usage: "pull an image from a remote",
ArgsUsage: "[flags] <ref>",
Description: `Fetch and prepare an image for use in containerd.
After pulling an image, it should be ready to use the same reference in a run
command. As part of this process, we do the following:
1. Fetch all resources into containerd.
2. Prepare the snapshot filesystem with the pulled resources.
3. Register metadata for the image.
`,
Flags: append(append(commands.RegistryFlags, append(commands.SnapshotterFlags, commands.LabelFlag)...),
cli.StringSliceFlag{
Name: "platform",
Usage: "Pull content from a specific platform",
Value: &cli.StringSlice{platforms.Default()},
},
cli.BoolFlag{
Name: "all-platforms",
Usage: "pull content from all platforms",
},
),
Action: func(context *cli.Context) error {
var (
ref = context.Args().First()
)
if ref == "" {
return fmt.Errorf("please provide an image reference to pull")
}
ctx, cancel := commands.AppContext(context)
defer cancel()
img, err := content.Fetch(ref, context)
if err != nil {
return err
}
log.G(ctx).WithField("image", ref).Debug("unpacking")
// TODO: Show unpack status
fmt.Printf("unpacking %s...\n", img.Target().Digest)
err = img.Unpack(ctx, context.String("snapshotter"))
if err == nil {
fmt.Println("done")
}
return err
},
}