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buildx/store/storeutil/docker.go

120 lines
2.6 KiB
Go

package storeutil
import (
"context"
"io"
"sync"
"github.com/docker/buildx/util/progress"
"github.com/docker/cli/cli/command"
"github.com/docker/cli/cli/context/docker"
"github.com/docker/docker/client"
)
// DockerClient represents an active docker object.
type DockerClient struct {
cli command.Cli
}
// NewDockerClient initializes a new docker client.
func NewDockerClient(cli command.Cli) *DockerClient {
return &DockerClient{cli: cli}
}
// API returns a new docker API client.
func (c *DockerClient) API(name string) (client.APIClient, error) {
if name == "" {
name = c.cli.CurrentContext()
}
return ClientForEndpoint(c.cli, name)
}
// LoadImage imports an image to docker.
func (c *DockerClient) LoadImage(ctx context.Context, name string, status progress.Writer) (io.WriteCloser, func(), error) {
dapi, err := c.API(name)
if err != nil {
return nil, nil, err
}
pr, pw := io.Pipe()
done := make(chan struct{})
ctx, cancel := context.WithCancel(ctx)
var w *waitingWriter
w = &waitingWriter{
PipeWriter: pw,
f: func() {
resp, err := dapi.ImageLoad(ctx, pr, false)
defer close(done)
if err != nil {
pr.CloseWithError(err)
w.mu.Lock()
w.err = err
w.mu.Unlock()
return
}
prog := progress.WithPrefix(status, "", false)
progress.FromReader(prog, "importing to docker", resp.Body)
},
done: done,
cancel: cancel,
}
return w, func() {
pr.Close()
}, nil
}
type waitingWriter struct {
*io.PipeWriter
f func()
once sync.Once
mu sync.Mutex
err error
done chan struct{}
cancel func()
}
func (w *waitingWriter) Write(dt []byte) (int, error) {
w.once.Do(func() {
go w.f()
})
return w.PipeWriter.Write(dt)
}
func (w *waitingWriter) Close() error {
err := w.PipeWriter.Close()
<-w.done
if err == nil {
w.mu.Lock()
defer w.mu.Unlock()
return w.err
}
return err
}
// ClientForEndpoint returns a docker client for an endpoint
func ClientForEndpoint(dockerCli command.Cli, name string) (client.APIClient, error) {
dem, err := GetDockerEndpoint(dockerCli, name)
if err == nil && dem != nil {
ep, err := docker.WithTLSData(dockerCli.ContextStore(), name, *dem)
if err != nil {
return nil, err
}
clientOpts, err := ep.ClientOpts()
if err != nil {
return nil, err
}
return client.NewClientWithOpts(append(clientOpts, client.WithAPIVersionNegotiation())...)
}
ep := docker.Endpoint{
EndpointMeta: docker.EndpointMeta{
Host: name,
},
}
clientOpts, err := ep.ClientOpts()
if err != nil {
return nil, err
}
return client.NewClientWithOpts(append(clientOpts, client.WithAPIVersionNegotiation())...)
}