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dockerd.go
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dockerd.go
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package integration
import (
"bytes"
"context"
"fmt"
"io"
"io/ioutil"
"net"
"os"
"time"
"golang.org/x/sync/errgroup"
"github.com/docker/docker/testutil/daemon"
)
const dockerdBinary = "dockerd"
type logTAdapter struct {
Name string
Logs map[string]*bytes.Buffer
}
func (l logTAdapter) Logf(format string, v ...interface{}) {
if buf, ok := l.Logs[l.Name]; !ok || buf == nil {
l.Logs[l.Name] = &bytes.Buffer{}
}
fmt.Fprintf(l.Logs[l.Name], format, v...)
}
// InitDockerdWorker registers a dockerd worker with the global registry.
func InitDockerdWorker() {
Register(&dockerd{})
}
type dockerd struct{}
func (c dockerd) Name() string {
return dockerdBinary
}
func (c dockerd) New(cfg *BackendConfig) (b Backend, cl func() error, err error) {
if err := requireRoot(); err != nil {
return nil, nil, err
}
deferF := &multiCloser{}
cl = deferF.F()
defer func() {
if err != nil {
deferF.F()()
cl = nil
}
}()
var proxyGroup errgroup.Group
deferF.append(proxyGroup.Wait)
workDir, err := ioutil.TempDir("", "integration")
if err != nil {
return nil, nil, err
}
cmd, err := daemon.NewDaemon(
workDir,
daemon.WithTestLogger(logTAdapter{
Name: "creatingDaemon",
Logs: cfg.Logs,
}),
daemon.WithContainerdSocket(""),
)
if err != nil {
return nil, nil, fmt.Errorf("new daemon error: %q, %s", err, formatLogs(cfg.Logs))
}
err = cmd.StartWithError()
if err != nil {
return nil, nil, err
}
deferF.append(cmd.StopWithError)
logs := map[string]*bytes.Buffer{}
if err := waitUnix(cmd.Sock(), 5*time.Second); err != nil {
return nil, nil, fmt.Errorf("dockerd did not start up: %q, %s", err, formatLogs(logs))
}
ctx, cancel := context.WithCancel(context.Background())
deferF.append(func() error { cancel(); return nil })
dockerAPI, err := cmd.NewClient()
if err != nil {
return nil, nil, err
}
deferF.append(dockerAPI.Close)
// Create a file descriptor to be used as a Unix domain socket.
// Remove it immediately (the name will still be valid for the socket) so that
// we don't leave files all over the users tmp tree.
f, err := ioutil.TempFile("", "buildkit-integration")
if err != nil {
return
}
localPath := f.Name()
f.Close()
os.Remove(localPath)
listener, err := net.Listen("unix", localPath)
if err != nil {
return nil, nil, err
}
deferF.append(listener.Close)
proxyGroup.Go(func() error {
for {
tmpConn, err := listener.Accept()
if err != nil {
// Ignore the error from accept which is always a system error.
return nil
}
conn, err := dockerAPI.DialHijack(ctx, "/grpc", "h2c", nil)
if err != nil {
return err
}
proxyGroup.Go(func() error {
_, err := io.Copy(conn, tmpConn)
if err != nil {
return err
}
return tmpConn.Close()
})
proxyGroup.Go(func() error {
_, err := io.Copy(tmpConn, conn)
if err != nil {
return err
}
return conn.Close()
})
}
})
return backend{
address: "unix://" + listener.Addr().String(),
rootless: false,
}, cl, nil
}