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driver.go
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driver.go
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package docker
import (
"archive/tar"
"bytes"
"context"
"io"
"io/ioutil"
"net"
"os"
"time"
"github.com/docker/buildx/driver"
"github.com/docker/buildx/driver/bkimage"
"github.com/docker/buildx/util/progress"
"github.com/docker/docker/api/types"
dockertypes "github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/api/types/network"
dockerclient "github.com/docker/docker/client"
"github.com/docker/docker/pkg/stdcopy"
"github.com/moby/buildkit/client"
"github.com/pkg/errors"
)
type Driver struct {
driver.InitConfig
factory driver.Factory
netMode string
image string
env []string
}
func (d *Driver) Bootstrap(ctx context.Context, l progress.Logger) error {
return progress.Wrap("[internal] booting buildkit", l, func(sub progress.SubLogger) error {
_, err := d.DockerAPI.ContainerInspect(ctx, d.Name)
if err != nil {
if dockerclient.IsErrNotFound(err) {
return d.create(ctx, sub)
}
return err
}
return sub.Wrap("starting container "+d.Name, func() error {
if err := d.start(ctx, sub); err != nil {
return err
}
if err := d.wait(ctx, sub); err != nil {
return err
}
return nil
})
})
}
func (d *Driver) create(ctx context.Context, l progress.SubLogger) error {
imageName := bkimage.DefaultImage
if d.image != "" {
imageName = d.image
}
if err := l.Wrap("pulling image "+imageName, func() error {
rc, err := d.DockerAPI.ImageCreate(ctx, imageName, types.ImageCreateOptions{})
if err != nil {
return err
}
_, err = io.Copy(ioutil.Discard, rc)
return err
}); err != nil {
// image pulling failed, check if it exists in local image store.
// if not, return pulling error. otherwise log it.
_, _, errInspect := d.DockerAPI.ImageInspectWithRaw(ctx, imageName)
if errInspect != nil {
return err
}
l.Wrap("pulling failed, using local image "+imageName, func() error { return nil })
}
cfg := &container.Config{
Image: imageName,
Env: d.env,
}
if d.InitConfig.BuildkitFlags != nil {
cfg.Cmd = d.InitConfig.BuildkitFlags
}
if err := l.Wrap("creating container "+d.Name, func() error {
hc := &container.HostConfig{
Privileged: true,
}
if d.netMode != "" {
hc.NetworkMode = container.NetworkMode(d.netMode)
}
_, err := d.DockerAPI.ContainerCreate(ctx, cfg, hc, &network.NetworkingConfig{}, d.Name)
if err != nil {
return err
}
if f := d.InitConfig.ConfigFile; f != "" {
buf, err := readFileToTar(f)
if err != nil {
return err
}
if err := d.DockerAPI.CopyToContainer(ctx, d.Name, "/", buf, dockertypes.CopyToContainerOptions{}); err != nil {
return err
}
}
if err := d.start(ctx, l); err != nil {
return err
}
if err := d.wait(ctx, l); err != nil {
return err
}
return nil
}); err != nil {
return err
}
return nil
}
func (d *Driver) wait(ctx context.Context, l progress.SubLogger) error {
try := 1
for {
bufStdout := &bytes.Buffer{}
bufStderr := &bytes.Buffer{}
if err := d.run(ctx, []string{"buildctl", "debug", "workers"}, bufStdout, bufStderr); err != nil {
if try > 15 {
if err != nil {
d.copyLogs(context.TODO(), l)
if bufStdout.Len() != 0 {
l.Log(1, bufStdout.Bytes())
}
if bufStderr.Len() != 0 {
l.Log(2, bufStderr.Bytes())
}
}
return err
}
select {
case <-ctx.Done():
return ctx.Err()
case <-time.After(time.Duration(try*120) * time.Millisecond):
try++
continue
}
}
return nil
}
}
func (d *Driver) copyLogs(ctx context.Context, l progress.SubLogger) error {
rc, err := d.DockerAPI.ContainerLogs(ctx, d.Name, types.ContainerLogsOptions{
ShowStdout: true, ShowStderr: true,
})
if err != nil {
return err
}
stdout := &logWriter{logger: l, stream: 1}
stderr := &logWriter{logger: l, stream: 2}
if _, err := stdcopy.StdCopy(stdout, stderr, rc); err != nil {
return err
}
return rc.Close()
}
func (d *Driver) exec(ctx context.Context, cmd []string) (string, net.Conn, error) {
execConfig := types.ExecConfig{
Cmd: cmd,
AttachStdin: true,
AttachStdout: true,
AttachStderr: true,
}
response, err := d.DockerAPI.ContainerExecCreate(ctx, d.Name, execConfig)
if err != nil {
return "", nil, err
}
execID := response.ID
if execID == "" {
return "", nil, errors.New("exec ID empty")
}
resp, err := d.DockerAPI.ContainerExecAttach(ctx, execID, types.ExecStartCheck{})
if err != nil {
return "", nil, err
}
return execID, resp.Conn, nil
}
func (d *Driver) run(ctx context.Context, cmd []string, stdout, stderr io.Writer) (err error) {
id, conn, err := d.exec(ctx, cmd)
if err != nil {
return err
}
if _, err := stdcopy.StdCopy(stdout, stderr, conn); err != nil {
return err
}
conn.Close()
resp, err := d.DockerAPI.ContainerExecInspect(ctx, id)
if err != nil {
return err
}
if resp.ExitCode != 0 {
return errors.Errorf("exit code %d", resp.ExitCode)
}
return nil
}
func (d *Driver) start(ctx context.Context, l progress.SubLogger) error {
return d.DockerAPI.ContainerStart(ctx, d.Name, types.ContainerStartOptions{})
}
func (d *Driver) Info(ctx context.Context) (*driver.Info, error) {
container, err := d.DockerAPI.ContainerInspect(ctx, d.Name)
if err != nil {
if dockerclient.IsErrNotFound(err) {
return &driver.Info{
Status: driver.Inactive,
}, nil
}
return nil, err
}
if container.State.Running {
return &driver.Info{
Status: driver.Running,
}, nil
}
return &driver.Info{
Status: driver.Stopped,
}, nil
}
func (d *Driver) Stop(ctx context.Context, force bool) error {
info, err := d.Info(ctx)
if err != nil {
return err
}
if info.Status == driver.Running {
return d.DockerAPI.ContainerStop(ctx, d.Name, nil)
}
return nil
}
func (d *Driver) Rm(ctx context.Context, force bool) error {
info, err := d.Info(ctx)
if err != nil {
return err
}
if info.Status != driver.Inactive {
return d.DockerAPI.ContainerRemove(ctx, d.Name, dockertypes.ContainerRemoveOptions{
RemoveVolumes: true,
Force: true,
})
}
return nil
}
func (d *Driver) Client(ctx context.Context) (*client.Client, error) {
_, conn, err := d.exec(ctx, []string{"buildctl", "dial-stdio"})
if err != nil {
return nil, err
}
conn = demuxConn(conn)
return client.New(ctx, "", client.WithContextDialer(func(context.Context, string) (net.Conn, error) {
return conn, nil
}))
}
func (d *Driver) Factory() driver.Factory {
return d.factory
}
func (d *Driver) Features() map[driver.Feature]bool {
return map[driver.Feature]bool{
driver.OCIExporter: true,
driver.DockerExporter: true,
driver.CacheExport: true,
driver.MultiPlatform: true,
}
}
func demuxConn(c net.Conn) net.Conn {
pr, pw := io.Pipe()
// TODO: rewrite parser with Reader() to avoid goroutine switch
go stdcopy.StdCopy(pw, os.Stderr, c)
return &demux{
Conn: c,
Reader: pr,
}
}
type demux struct {
net.Conn
io.Reader
}
func (d *demux) Read(dt []byte) (int, error) {
return d.Reader.Read(dt)
}
func readFileToTar(fn string) (*bytes.Buffer, error) {
buf := bytes.NewBuffer(nil)
tw := tar.NewWriter(buf)
dt, err := ioutil.ReadFile(fn)
if err != nil {
return nil, err
}
if err := tw.WriteHeader(&tar.Header{
Name: "/etc/buildkit/buildkitd.toml",
Size: int64(len(dt)),
Mode: 0644,
}); err != nil {
return nil, err
}
if _, err := tw.Write(dt); err != nil {
return nil, err
}
if err := tw.Close(); err != nil {
return nil, err
}
return buf, nil
}
type logWriter struct {
logger progress.SubLogger
stream int
}
func (l *logWriter) Write(dt []byte) (int, error) {
l.logger.Log(l.stream, dt)
return len(dt), nil
}