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oci.go
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oci.go
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package integration
import (
"bufio"
"bytes"
"fmt"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"runtime"
"syscall"
"testing"
"time"
"github.com/google/shlex"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
func init() {
register(&oci{})
// the rootless uid is defined in hack/dockerfiles/test.Dockerfile
if s := os.Getenv("BUILDKIT_INTEGRATION_ROOTLESS_IDPAIR"); s != "" {
var uid, gid int
if _, err := fmt.Sscanf(s, "%d:%d", &uid, &gid); err != nil {
logrus.Fatalf("unexpected BUILDKIT_INTEGRATION_ROOTLESS_IDPAIR: %q", s)
}
if rootlessSupported(uid) {
register(&oci{uid: uid, gid: gid})
}
}
}
type oci struct {
uid int
gid int
}
func (s *oci) Name() string {
if s.uid != 0 {
return "oci-rootless"
}
return "oci"
}
func (s *oci) New(opt ...SandboxOpt) (Sandbox, func() error, error) {
var c SandboxConf
for _, o := range opt {
o(&c)
}
if err := lookupBinary("buildkitd"); err != nil {
return nil, nil, err
}
if err := requireRoot(); err != nil {
return nil, nil, err
}
logs := map[string]*bytes.Buffer{}
// Include use of --oci-worker-labels to trigger https://github.com/moby/buildkit/pull/603
buildkitdArgs := []string{"buildkitd", "--oci-worker=true", "--containerd-worker=false", "--oci-worker-labels=org.mobyproject.buildkit.worker.sandbox=true"}
deferF := &multiCloser{}
if c.mirror != "" {
dir, err := configWithMirror(c.mirror)
if err != nil {
return nil, nil, err
}
deferF.append(func() error {
return os.RemoveAll(dir)
})
buildkitdArgs = append(buildkitdArgs, "--config="+filepath.Join(dir, "buildkitd.toml"))
}
if s.uid != 0 {
if s.gid == 0 {
deferF.F()()
return nil, nil, errors.Errorf("unsupported id pair: uid=%d, gid=%d", s.uid, s.gid)
}
// TODO: make sure the user exists and subuid/subgid are configured.
buildkitdArgs = append([]string{"sudo", "-u", fmt.Sprintf("#%d", s.uid), "-i", "--", "rootlesskit"}, buildkitdArgs...)
}
buildkitdSock, stop, err := runBuildkitd(buildkitdArgs, logs, s.uid, s.gid)
if err != nil {
deferF.F()()
return nil, nil, err
}
deferF.append(stop)
return &sandbox{address: buildkitdSock, mv: c.mv, logs: logs, cleanup: deferF, rootless: s.uid != 0}, deferF.F(), nil
}
type sandbox struct {
address string
logs map[string]*bytes.Buffer
cleanup *multiCloser
rootless bool
mv matrixValue
}
func (sb *sandbox) Address() string {
return sb.address
}
func (sb *sandbox) PrintLogs(t *testing.T) {
for name, l := range sb.logs {
t.Log(name)
s := bufio.NewScanner(l)
for s.Scan() {
t.Log(s.Text())
}
}
}
func (sb *sandbox) NewRegistry() (string, error) {
url, cl, err := newRegistry("")
if err != nil {
return "", err
}
sb.cleanup.append(cl)
return url, nil
}
func (sb *sandbox) Cmd(args ...string) *exec.Cmd {
if len(args) == 1 {
if split, err := shlex.Split(args[0]); err == nil {
args = split
}
}
cmd := exec.Command("buildctl", args...)
cmd.Env = append(cmd.Env, os.Environ()...)
cmd.Env = append(cmd.Env, "BUILDKIT_HOST="+sb.Address())
return cmd
}
func (sb *sandbox) Rootless() bool {
return sb.rootless
}
func (sb *sandbox) Value(k string) interface{} {
return sb.mv.values[k].value
}
func runBuildkitd(args []string, logs map[string]*bytes.Buffer, uid, gid int) (address string, cl func() error, err error) {
deferF := &multiCloser{}
cl = deferF.F()
defer func() {
if err != nil {
deferF.F()()
cl = nil
}
}()
tmpdir, err := ioutil.TempDir("", "bktest_buildkitd")
if err != nil {
return "", nil, err
}
if err := os.Chown(tmpdir, uid, gid); err != nil {
return "", nil, err
}
deferF.append(func() error { return os.RemoveAll(tmpdir) })
address = "unix://" + filepath.Join(tmpdir, "buildkitd.sock")
if runtime.GOOS == "windows" {
address = "//./pipe/buildkitd-" + filepath.Base(tmpdir)
}
args = append(args, "--root", tmpdir, "--addr", address, "--debug")
cmd := exec.Command(args[0], args[1:]...)
cmd.Env = append(os.Environ(), "BUILDKIT_DEBUG_EXEC_OUTPUT=1")
cmd.SysProcAttr = &syscall.SysProcAttr{
Setsid: true, // stretch sudo needs this for sigterm
}
if stop, err := startCmd(cmd, logs); err != nil {
return "", nil, err
} else {
deferF.append(stop)
}
if err := waitUnix(address, 5*time.Second); err != nil {
return "", nil, err
}
return
}
func rootlessSupported(uid int) bool {
cmd := exec.Command("sudo", "-u", fmt.Sprintf("#%d", uid), "-i", "--", "unshare", "-U", "true")
b, err := cmd.CombinedOutput()
if err != nil {
logrus.Warnf("rootless mode is not supported on this host: %v (%s)", err, string(b))
return false
}
return true
}