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|
package main
import (
"context"
"flag"
"fmt"
"log"
"github.com/containerd/containerd"
"github.com/containerd/containerd/namespaces"
"github.com/containerd/containerd/platforms"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
)
const (
containerdSock = "/run/containerd/containerd.sock"
defaultNamespace = "c2vm"
)
var (
platform = platforms.Only(ocispec.Platform{
OS: "linux",
Architecture: "amd64",
})
)
func main() {
var (
containerName = flag.String("container", "", "Name of the container")
)
flag.Parse()
if *containerName == "" {
log.Fatal("a container is required")
}
client, err := containerd.New(containerdSock)
if err != nil {
log.Fatalf("failed to create a client for containerd: %v", err)
}
defer client.Close()
ctx := namespaces.WithNamespace(context.Background(), defaultNamespace)
image, err := client.Pull(ctx, *containerName, containerd.WithPlatformMatcher(platform))
if err != nil {
log.Fatalf("failed to pull the container %s: %v\n", *containerName, err)
}
imageSize, err := image.Usage(ctx, containerd.WithUsageManifestLimit(1))
if err != nil {
log.Fatalf("failed to get the size of the image: %v", err)
}
fmt.Printf("pulled %s (%d bytes)\n", image.Name(), imageSize)
}
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