DockerCLI/internal/containerizedengine/containerd.go

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package containerizedengine
import (
"context"
"io"
"github.com/containerd/containerd"
"github.com/containerd/containerd/images"
"github.com/containerd/containerd/remotes/docker"
"github.com/docker/docker/api/types"
"github.com/docker/docker/pkg/jsonmessage"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
)
// NewClient returns a new containerizedengine client
// This client can be used to manage the lifecycle of
// dockerd running as a container on containerd.
func NewClient(sockPath string) (Client, error) {
if sockPath == "" {
sockPath = containerdSockPath
}
cclient, err := containerd.New(sockPath)
if err != nil {
return nil, err
}
return baseClient{
cclient: cclient,
}, nil
}
// Close will close the underlying clients
func (c baseClient) Close() error {
return c.cclient.Close()
}
func (c baseClient) pullWithAuth(ctx context.Context, imageName string, out OutStream,
authConfig *types.AuthConfig) (containerd.Image, error) {
resolver := docker.NewResolver(docker.ResolverOptions{
Credentials: func(string) (string, string, error) {
return authConfig.Username, authConfig.Password, nil
},
})
ongoing := newJobs(imageName)
pctx, stopProgress := context.WithCancel(ctx)
progress := make(chan struct{})
bufin, bufout := io.Pipe()
go func() {
showProgress(pctx, ongoing, c.cclient.ContentStore(), bufout)
}()
go func() {
jsonmessage.DisplayJSONMessagesToStream(bufin, out, nil)
close(progress)
}()
h := images.HandlerFunc(func(ctx context.Context, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
if desc.MediaType != images.MediaTypeDockerSchema1Manifest {
ongoing.add(desc)
}
return nil, nil
})
image, err := c.cclient.Pull(ctx, imageName,
containerd.WithResolver(resolver),
containerd.WithImageHandler(h),
containerd.WithPullUnpack)
stopProgress()
if err != nil {
return nil, err
}
<-progress
return image, nil
}