vendor: update containerd to 1.0.1-rc0

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
2018-01-11 17:49:09 -08:00 · 2018-01-11 17:49:09 -08:00 · b8dc00de71
parent 99b32f1878
commit b8dc00de71
67 changed files with 1590 additions and 1019 deletions
--- a/README.md
+++ b/README.md
@ -211,7 +211,7 @@ export JAEGER_TRACE=0.0.0.0:6831

 ### Supported runc version

-During development, BuildKit is tested with the version of runc that is being used by the containerd repository. Please refer to [runc.md](https://github.com/containerd/containerd/blob/v1.0.0/RUNC.md) for more information.
+During development, BuildKit is tested with the version of runc that is being used by the containerd repository. Please refer to [runc.md](https://github.com/containerd/containerd/blob/v1.0.1-rc.0/RUNC.md) for more information.


 ### Contributing
--- a/examples/buildkit0/buildkit.go
+++ b/examples/buildkit0/buildkit.go
@ -17,8 +17,8 @@ type buildOpt struct {
 func main() {
 	var opt buildOpt
 	flag.BoolVar(&opt.withContainerd, "with-containerd", true, "enable containerd worker")
-	flag.StringVar(&opt.containerd, "containerd", "v1.0.0", "containerd version")
-	flag.StringVar(&opt.runc, "runc", "74a17296470088de3805e138d3d87c62e613dfc4", "runc version")
+	flag.StringVar(&opt.containerd, "containerd", "v1.0.1-rc.0", "containerd version")
+	flag.StringVar(&opt.runc, "runc", "7f24b40cc5423969b4554ef04ba0b00e2b4ba010", "runc version")
 	flag.Parse()

 	bk := buildkit(opt)
--- a/examples/buildkit1/buildkit.go
+++ b/examples/buildkit1/buildkit.go
@ -17,8 +17,8 @@ type buildOpt struct {
 func main() {
 	var opt buildOpt
 	flag.BoolVar(&opt.withContainerd, "with-containerd", true, "enable containerd worker")
-	flag.StringVar(&opt.containerd, "containerd", "v1.0.0", "containerd version")
-	flag.StringVar(&opt.runc, "runc", "74a17296470088de3805e138d3d87c62e613dfc4", "runc version")
+	flag.StringVar(&opt.containerd, "containerd", "v1.0.1-rc.0", "containerd version")
+	flag.StringVar(&opt.runc, "runc", "7f24b40cc5423969b4554ef04ba0b00e2b4ba010", "runc version")
 	flag.Parse()

 	bk := buildkit(opt)
--- a/examples/buildkit2/buildkit.go
+++ b/examples/buildkit2/buildkit.go
@ -17,8 +17,8 @@ type buildOpt struct {
 func main() {
 	var opt buildOpt
 	flag.BoolVar(&opt.withContainerd, "with-containerd", true, "enable containerd worker")
-	flag.StringVar(&opt.containerd, "containerd", "v1.0.0", "containerd version")
-	flag.StringVar(&opt.runc, "runc", "74a17296470088de3805e138d3d87c62e613dfc4", "runc version")
+	flag.StringVar(&opt.containerd, "containerd", "v1.0.1-rc.0", "containerd version")
+	flag.StringVar(&opt.runc, "runc", "7f24b40cc5423969b4554ef04ba0b00e2b4ba010", "runc version")
 	flag.Parse()

 	bk := buildkit(opt)
--- a/examples/buildkit3/buildkit.go
+++ b/examples/buildkit3/buildkit.go
@ -18,8 +18,8 @@ type buildOpt struct {
 func main() {
 	var opt buildOpt
 	flag.BoolVar(&opt.withContainerd, "with-containerd", true, "enable containerd worker")
-	flag.StringVar(&opt.containerd, "containerd", "v1.0.0", "containerd version")
-	flag.StringVar(&opt.runc, "runc", "74a17296470088de3805e138d3d87c62e613dfc4", "runc version")
+	flag.StringVar(&opt.containerd, "containerd", "v1.0.1-rc.0", "containerd version")
+	flag.StringVar(&opt.runc, "runc", "7f24b40cc5423969b4554ef04ba0b00e2b4ba010", "runc version")
 	flag.StringVar(&opt.buildkit, "buildkit", "master", "buildkit version")
 	flag.Parse()

--- a/executor/containerdexecutor/executor.go
+++ b/executor/containerdexecutor/executor.go
@ -85,7 +85,7 @@ func (w containerdExecutor) Exec(ctx context.Context, meta executor.Meta, root c
 		stdin = &emptyReadCloser{}
 	}

-	task, err := container.NewTask(ctx, cio.NewIO(stdin, stdout, stderr), containerd.WithRootFS(rootMounts))
+	task, err := container.NewTask(ctx, cio.NewCreator(cio.WithStreams(stdin, stdout, stderr)), containerd.WithRootFS(rootMounts))
 	if err != nil {
 		return err
 	}
--- a/hack/dockerfiles/test.Dockerfile
+++ b/hack/dockerfiles/test.Dockerfile
@ -1,5 +1,5 @@
-ARG RUNC_VERSION=74a17296470088de3805e138d3d87c62e613dfc4
-ARG CONTAINERD_VERSION=v1.0.0
+ARG RUNC_VERSION=7f24b40cc5423969b4554ef04ba0b00e2b4ba010
+ARG CONTAINERD_VERSION=v1.0.1-rc.0
 # available targets: buildkitd, buildkitd.oci_only, buildkitd.containerd_only
 ARG BUILDKIT_TARGET=buildkitd
 ARG REGISTRY_VERSION=2.6
--- a/vendor.conf
+++ b/vendor.conf
@ -6,21 +6,21 @@ github.com/davecgh/go-spew v1.1.0
 github.com/pmezard/go-difflib v1.0.0
 golang.org/x/sys 9aade4d3a3b7e6d876cd3823ad20ec45fc035402 # update to 7ddbeae9ae08c6a06a59597f0c9edbc5ff2444ce wiht pkg/signal change

-github.com/containerd/containerd v1.0.0
+github.com/containerd/containerd 90553efdef0678b2609aed74926a487f8ff58d1a
 github.com/containerd/typeurl f6943554a7e7e88b3c14aad190bf05932da84788
 golang.org/x/sync 450f422ab23cf9881c94e2db30cac0eb1b7cf80c
 github.com/sirupsen/logrus v1.0.0
-google.golang.org/grpc v1.7.2
+google.golang.org/grpc v1.7.4
 github.com/opencontainers/go-digest 21dfd564fd89c944783d00d069f33e3e7123c448
 golang.org/x/net 7dcfb8076726a3fdd9353b6b8a1f1b6be6811bd6
 github.com/gogo/protobuf v0.5
 github.com/golang/protobuf 1643683e1b54a9e88ad26d98f81400c8c9d9f4f9
 github.com/containerd/continuity cf279e6ac893682272b4479d4c67fd3abf878b4e
-github.com/opencontainers/image-spec v1.0.0
-github.com/opencontainers/runc 74a17296470088de3805e138d3d87c62e613dfc4
-github.com/Microsoft/go-winio v0.4.4
+github.com/opencontainers/image-spec v1.0.1
+github.com/opencontainers/runc 7f24b40cc5423969b4554ef04ba0b00e2b4ba010
+github.com/Microsoft/go-winio v0.4.5
 github.com/containerd/fifo fbfb6a11ec671efbe94ad1c12c2e98773f19e1e6
-github.com/opencontainers/runtime-spec v1.0.0
+github.com/opencontainers/runtime-spec v1.0.1
 github.com/containerd/go-runc ed1cbe1fc31f5fb2359d3a54b6330d1a097858b7
 github.com/containerd/console 84eeaae905fa414d03e07bcd6c8d3f19e7cf180e
 google.golang.org/genproto d80a6e20e776b0b17a324d0ba1ab50a39c8e8944
--- a/vendor/github.com/Microsoft/go-winio/backup.go
+++ b/vendor/github.com/Microsoft/go-winio/backup.go
@ -68,10 +68,20 @@ func NewBackupStreamReader(r io.Reader) *BackupStreamReader {
 	return &BackupStreamReader{r, 0}
 }

-// Next returns the next backup stream and prepares for calls to Write(). It skips the remainder of the current stream if
+// Next returns the next backup stream and prepares for calls to Read(). It skips the remainder of the current stream if
 // it was not completely read.
 func (r *BackupStreamReader) Next() (*BackupHeader, error) {
 	if r.bytesLeft > 0 {
+		if s, ok := r.r.(io.Seeker); ok {
+			// Make sure Seek on io.SeekCurrent sometimes succeeds
+			// before trying the actual seek.
+			if _, err := s.Seek(0, io.SeekCurrent); err == nil {
+				if _, err = s.Seek(r.bytesLeft, io.SeekCurrent); err != nil {
+					return nil, err
+				}
+				r.bytesLeft = 0
+			}
+		}
 		if _, err := io.Copy(ioutil.Discard, r); err != nil {
 			return nil, err
 		}
@ -220,7 +230,7 @@ type BackupFileWriter struct {
 	ctx             uintptr
 }

-// NewBackupFileWrtier returns a new BackupFileWriter from a file handle. If includeSecurity is true,
+// NewBackupFileWriter returns a new BackupFileWriter from a file handle. If includeSecurity is true,
 // Write() will attempt to restore the security descriptor from the stream.
 func NewBackupFileWriter(f *os.File, includeSecurity bool) *BackupFileWriter {
 	w := &BackupFileWriter{f, includeSecurity, 0}
--- a/vendor/github.com/Microsoft/go-winio/ea.go
+++ b/vendor/github.com/Microsoft/go-winio/ea.go
@ -0,0 +1,137 @@
+package winio
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+)
+
+type fileFullEaInformation struct {
+	NextEntryOffset uint32
+	Flags           uint8
+	NameLength      uint8
+	ValueLength     uint16
+}
+
+var (
+	fileFullEaInformationSize = binary.Size(&fileFullEaInformation{})
+
+	errInvalidEaBuffer = errors.New("invalid extended attribute buffer")
+	errEaNameTooLarge  = errors.New("extended attribute name too large")
+	errEaValueTooLarge = errors.New("extended attribute value too large")
+)
+
+// ExtendedAttribute represents a single Windows EA.
+type ExtendedAttribute struct {
+	Name  string
+	Value []byte
+	Flags uint8
+}
+
+func parseEa(b []byte) (ea ExtendedAttribute, nb []byte, err error) {
+	var info fileFullEaInformation
+	err = binary.Read(bytes.NewReader(b), binary.LittleEndian, &info)
+	if err != nil {
+		err = errInvalidEaBuffer
+		return
+	}
+
+	nameOffset := fileFullEaInformationSize
+	nameLen := int(info.NameLength)
+	valueOffset := nameOffset + int(info.NameLength) + 1
+	valueLen := int(info.ValueLength)
+	nextOffset := int(info.NextEntryOffset)
+	if valueLen+valueOffset > len(b) || nextOffset < 0 || nextOffset > len(b) {
+		err = errInvalidEaBuffer
+		return
+	}
+
+	ea.Name = string(b[nameOffset : nameOffset+nameLen])
+	ea.Value = b[valueOffset : valueOffset+valueLen]
+	ea.Flags = info.Flags
+	if info.NextEntryOffset != 0 {
+		nb = b[info.NextEntryOffset:]
+	}
+	return
+}
+
+// DecodeExtendedAttributes decodes a list of EAs from a FILE_FULL_EA_INFORMATION
+// buffer retrieved from BackupRead, ZwQueryEaFile, etc.
+func DecodeExtendedAttributes(b []byte) (eas []ExtendedAttribute, err error) {
+	for len(b) != 0 {
+		ea, nb, err := parseEa(b)
+		if err != nil {
+			return nil, err
+		}
+
+		eas = append(eas, ea)
+		b = nb
+	}
+	return
+}
+
+func writeEa(buf *bytes.Buffer, ea *ExtendedAttribute, last bool) error {
+	if int(uint8(len(ea.Name))) != len(ea.Name) {
+		return errEaNameTooLarge
+	}
+	if int(uint16(len(ea.Value))) != len(ea.Value) {
+		return errEaValueTooLarge
+	}
+	entrySize := uint32(fileFullEaInformationSize + len(ea.Name) + 1 + len(ea.Value))
+	withPadding := (entrySize + 3) &^ 3
+	nextOffset := uint32(0)
+	if !last {
+		nextOffset = withPadding
+	}
+	info := fileFullEaInformation{
+		NextEntryOffset: nextOffset,
+		Flags:           ea.Flags,
+		NameLength:      uint8(len(ea.Name)),
+		ValueLength:     uint16(len(ea.Value)),
+	}
+
+	err := binary.Write(buf, binary.LittleEndian, &info)
+	if err != nil {
+		return err
+	}
+
+	_, err = buf.Write([]byte(ea.Name))
+	if err != nil {
+		return err
+	}
+
+	err = buf.WriteByte(0)
+	if err != nil {
+		return err
+	}
+
+	_, err = buf.Write(ea.Value)
+	if err != nil {
+		return err
+	}
+
+	_, err = buf.Write([]byte{0, 0, 0}[0 : withPadding-entrySize])
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// EncodeExtendedAttributes encodes a list of EAs into a FILE_FULL_EA_INFORMATION
+// buffer for use with BackupWrite, ZwSetEaFile, etc.
+func EncodeExtendedAttributes(eas []ExtendedAttribute) ([]byte, error) {
+	var buf bytes.Buffer
+	for i := range eas {
+		last := false
+		if i == len(eas)-1 {
+			last = true
+		}
+
+		err := writeEa(&buf, &eas[i], last)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return buf.Bytes(), nil
+}
--- a/vendor/github.com/Microsoft/go-winio/file.go
+++ b/vendor/github.com/Microsoft/go-winio/file.go
@ -78,6 +78,7 @@ func initIo() {
 type win32File struct {
 	handle        syscall.Handle
 	wg            sync.WaitGroup
+	wgLock        sync.RWMutex
 	closing       atomicBool
 	readDeadline  deadlineHandler
 	writeDeadline deadlineHandler
@ -114,14 +115,18 @@ func MakeOpenFile(h syscall.Handle) (io.ReadWriteCloser, error) {

 // closeHandle closes the resources associated with a Win32 handle
 func (f *win32File) closeHandle() {
+	f.wgLock.Lock()
 	// Atomically set that we are closing, releasing the resources only once.
 	if !f.closing.swap(true) {
+		f.wgLock.Unlock()
 		// cancel all IO and wait for it to complete
 		cancelIoEx(f.handle, nil)
 		f.wg.Wait()
 		// at this point, no new IO can start
 		syscall.Close(f.handle)
 		f.handle = 0
+	} else {
+		f.wgLock.Unlock()
 	}
 }

@ -134,10 +139,13 @@ func (f *win32File) Close() error {
 // prepareIo prepares for a new IO operation.
 // The caller must call f.wg.Done() when the IO is finished, prior to Close() returning.
 func (f *win32File) prepareIo() (*ioOperation, error) {
+	f.wgLock.RLock()
 	if f.closing.isSet() {
+		f.wgLock.RUnlock()
 		return nil, ErrFileClosed
 	}
 	f.wg.Add(1)
+	f.wgLock.RUnlock()
 	c := &ioOperation{}
 	c.ch = make(chan ioResult)
 	return c, nil
--- a/vendor/github.com/Microsoft/go-winio/pipe.go
+++ b/vendor/github.com/Microsoft/go-winio/pipe.go
@ -265,9 +265,9 @@ func (l *win32PipeListener) listenerRoutine() {
 			if err == nil {
 				// Wait for the client to connect.
 				ch := make(chan error)
-				go func() {
+				go func(p *win32File) {
 					ch <- connectPipe(p)
-				}()
+				}(p)
 				select {
 				case err = <-ch:
 					if err != nil {
--- a/vendor/github.com/containerd/containerd/README.md
+++ b/vendor/github.com/containerd/containerd/README.md
@ -4,6 +4,7 @@
 [![Build Status](https://travis-ci.org/containerd/containerd.svg?branch=master)](https://travis-ci.org/containerd/containerd)
 [![FOSSA Status](https://app.fossa.io/api/projects/git%2Bhttps%3A%2F%2Fgithub.com%2Fcontainerd%2Fcontainerd.svg?type=shield)](https://app.fossa.io/projects/git%2Bhttps%3A%2F%2Fgithub.com%2Fcontainerd%2Fcontainerd?ref=badge_shield)
 [![Go Report Card](https://goreportcard.com/badge/github.com/containerd/containerd)](https://goreportcard.com/report/github.com/containerd/containerd)
+[![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/1271/badge)](https://bestpractices.coreinfrastructure.org/projects/1271)

 containerd is an industry-standard container runtime with an emphasis on simplicity, robustness and portability. It is available as a daemon for Linux and Windows, which can manage the complete container lifecycle of its host system: image transfer and storage, container execution and supervision, low-level storage and network attachments, etc.

@ -13,7 +14,7 @@ containerd is designed to be embedded into a larger system, rather than being us

 ## Getting Started

-See our documentation on [containerd.io](containerd.io):
+See our documentation on [containerd.io](https://containerd.io):
 * [for ops and admins](docs/ops.md)
 * [namespaces](docs/namespaces.md)
 * [client options](docs/client-opts.md)
--- a/vendor/github.com/containerd/containerd/archive/strconv.go
+++ b/vendor/github.com/containerd/containerd/archive/strconv.go
@ -0,0 +1,52 @@
+// +build windows
+
+package archive
+
+import (
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/dmcgowan/go-tar"
+)
+
+// Forked from https://github.com/golang/go/blob/master/src/archive/tar/strconv.go
+// as archive/tar doesn't support CreationTime, but does handle PAX time parsing,
+// and there's no need to re-invent the wheel.
+
+// parsePAXTime takes a string of the form %d.%d as described in the PAX
+// specification. Note that this implementation allows for negative timestamps,
+// which is allowed for by the PAX specification, but not always portable.
+func parsePAXTime(s string) (time.Time, error) {
+	const maxNanoSecondDigits = 9
+
+	// Split string into seconds and sub-seconds parts.
+	ss, sn := s, ""
+	if pos := strings.IndexByte(s, '.'); pos >= 0 {
+		ss, sn = s[:pos], s[pos+1:]
+	}
+
+	// Parse the seconds.
+	secs, err := strconv.ParseInt(ss, 10, 64)
+	if err != nil {
+		return time.Time{}, tar.ErrHeader
+	}
+	if len(sn) == 0 {
+		return time.Unix(secs, 0), nil // No sub-second values
+	}
+
+	// Parse the nanoseconds.
+	if strings.Trim(sn, "0123456789") != "" {
+		return time.Time{}, tar.ErrHeader
+	}
+	if len(sn) < maxNanoSecondDigits {
+		sn += strings.Repeat("0", maxNanoSecondDigits-len(sn)) // Right pad
+	} else {
+		sn = sn[:maxNanoSecondDigits] // Right truncate
+	}
+	nsecs, _ := strconv.ParseInt(sn, 10, 64) // Must succeed
+	if len(ss) > 0 && ss[0] == '-' {
+		return time.Unix(secs, -nsecs), nil // Negative correction
+	}
+	return time.Unix(secs, nsecs), nil
+}
--- a/vendor/github.com/containerd/containerd/archive/tar.go
+++ b/vendor/github.com/containerd/containerd/archive/tar.go
@ -87,12 +87,23 @@ const (

 // Apply applies a tar stream of an OCI style diff tar.
 // See https://github.com/opencontainers/image-spec/blob/master/layer.md#applying-changesets
-func Apply(ctx context.Context, root string, r io.Reader) (int64, error) {
+func Apply(ctx context.Context, root string, r io.Reader, opts ...ApplyOpt) (int64, error) {
 	root = filepath.Clean(root)

+	var options ApplyOptions
+	for _, opt := range opts {
+		if err := opt(&options); err != nil {
+			return 0, errors.Wrap(err, "failed to apply option")
+		}
+	}
+
+	return apply(ctx, root, tar.NewReader(r), options)
+}
+
+// applyNaive applies a tar stream of an OCI style diff tar.
+// See https://github.com/opencontainers/image-spec/blob/master/layer.md#applying-changesets
+func applyNaive(ctx context.Context, root string, tr *tar.Reader, options ApplyOptions) (size int64, err error) {
 	var (
-		tr   = tar.NewReader(r)
-		size int64
 		dirs []*tar.Header

 		// Used for handling opaque directory markers which
@ -285,161 +296,6 @@ func Apply(ctx context.Context, root string, r io.Reader) (int64, error) {
 	return size, nil
 }

-type changeWriter struct {
-	tw        *tar.Writer
-	source    string
-	whiteoutT time.Time
-	inodeSrc  map[uint64]string
-	inodeRefs map[uint64][]string
-}
-
-func newChangeWriter(w io.Writer, source string) *changeWriter {
-	return &changeWriter{
-		tw:        tar.NewWriter(w),
-		source:    source,
-		whiteoutT: time.Now(),
-		inodeSrc:  map[uint64]string{},
-		inodeRefs: map[uint64][]string{},
-	}
-}
-
-func (cw *changeWriter) HandleChange(k fs.ChangeKind, p string, f os.FileInfo, err error) error {
-	if err != nil {
-		return err
-	}
-	if k == fs.ChangeKindDelete {
-		whiteOutDir := filepath.Dir(p)
-		whiteOutBase := filepath.Base(p)
-		whiteOut := filepath.Join(whiteOutDir, whiteoutPrefix+whiteOutBase)
-		hdr := &tar.Header{
-			Name:       whiteOut[1:],
-			Size:       0,
-			ModTime:    cw.whiteoutT,
-			AccessTime: cw.whiteoutT,
-			ChangeTime: cw.whiteoutT,
-		}
-		if err := cw.tw.WriteHeader(hdr); err != nil {
-			return errors.Wrap(err, "failed to write whiteout header")
-		}
-	} else {
-		var (
-			link   string
-			err    error
-			source = filepath.Join(cw.source, p)
-		)
-
-		if f.Mode()&os.ModeSymlink != 0 {
-			if link, err = os.Readlink(source); err != nil {
-				return err
-			}
-		}
-
-		hdr, err := tar.FileInfoHeader(f, link)
-		if err != nil {
-			return err
-		}
-
-		hdr.Mode = int64(chmodTarEntry(os.FileMode(hdr.Mode)))
-
-		name := p
-		if strings.HasPrefix(name, string(filepath.Separator)) {
-			name, err = filepath.Rel(string(filepath.Separator), name)
-			if err != nil {
-				return errors.Wrap(err, "failed to make path relative")
-			}
-		}
-		name, err = tarName(name)
-		if err != nil {
-			return errors.Wrap(err, "cannot canonicalize path")
-		}
-		// suffix with '/' for directories
-		if f.IsDir() && !strings.HasSuffix(name, "/") {
-			name += "/"
-		}
-		hdr.Name = name
-
-		if err := setHeaderForSpecialDevice(hdr, name, f); err != nil {
-			return errors.Wrap(err, "failed to set device headers")
-		}
-
-		// additionalLinks stores file names which must be linked to
-		// this file when this file is added
-		var additionalLinks []string
-		inode, isHardlink := fs.GetLinkInfo(f)
-		if isHardlink {
-			// If the inode has a source, always link to it
-			if source, ok := cw.inodeSrc[inode]; ok {
-				hdr.Typeflag = tar.TypeLink
-				hdr.Linkname = source
-				hdr.Size = 0
-			} else {
-				if k == fs.ChangeKindUnmodified {
-					cw.inodeRefs[inode] = append(cw.inodeRefs[inode], name)
-					return nil
-				}
-				cw.inodeSrc[inode] = name
-				additionalLinks = cw.inodeRefs[inode]
-				delete(cw.inodeRefs, inode)
-			}
-		} else if k == fs.ChangeKindUnmodified {
-			// Nothing to write to diff
-			return nil
-		}
-
-		if capability, err := getxattr(source, "security.capability"); err != nil {
-			return errors.Wrap(err, "failed to get capabilities xattr")
-		} else if capability != nil {
-			if hdr.PAXRecords == nil {
-				hdr.PAXRecords = map[string]string{}
-			}
-			hdr.PAXRecords[paxSchilyXattr+"security.capability"] = string(capability)
-		}
-
-		if err := cw.tw.WriteHeader(hdr); err != nil {
-			return errors.Wrap(err, "failed to write file header")
-		}
-
-		if hdr.Typeflag == tar.TypeReg && hdr.Size > 0 {
-			file, err := open(source)
-			if err != nil {
-				return errors.Wrapf(err, "failed to open path: %v", source)
-			}
-			defer file.Close()
-
-			buf := bufferPool.Get().(*[]byte)
-			n, err := io.CopyBuffer(cw.tw, file, *buf)
-			bufferPool.Put(buf)
-			if err != nil {
-				return errors.Wrap(err, "failed to copy")
-			}
-			if n != hdr.Size {
-				return errors.New("short write copying file")
-			}
-		}
-
-		if additionalLinks != nil {
-			source = hdr.Name
-			for _, extra := range additionalLinks {
-				hdr.Name = extra
-				hdr.Typeflag = tar.TypeLink
-				hdr.Linkname = source
-				hdr.Size = 0
-				if err := cw.tw.WriteHeader(hdr); err != nil {
-					return errors.Wrap(err, "failed to write file header")
-				}
-			}
-		}
-	}
-	return nil
-}
-
-func (cw *changeWriter) Close() error {
-	if err := cw.tw.Close(); err != nil {
-		return errors.Wrap(err, "failed to close tar writer")
-	}
-	return nil
-}
-
 func createTarFile(ctx context.Context, path, extractDir string, hdr *tar.Header, reader io.Reader) error {
 	// hdr.Mode is in linux format, which we can use for syscalls,
 	// but for os.Foo() calls we need the mode converted to os.FileMode,
@ -533,6 +389,194 @@ func createTarFile(ctx context.Context, path, extractDir string, hdr *tar.Header
 	return chtimes(path, boundTime(latestTime(hdr.AccessTime, hdr.ModTime)), boundTime(hdr.ModTime))
 }

+type changeWriter struct {
+	tw        *tar.Writer
+	source    string
+	whiteoutT time.Time
+	inodeSrc  map[uint64]string
+	inodeRefs map[uint64][]string
+	addedDirs map[string]struct{}
+}
+
+func newChangeWriter(w io.Writer, source string) *changeWriter {
+	return &changeWriter{
+		tw:        tar.NewWriter(w),
+		source:    source,
+		whiteoutT: time.Now(),
+		inodeSrc:  map[uint64]string{},
+		inodeRefs: map[uint64][]string{},
+		addedDirs: map[string]struct{}{},
+	}
+}
+
+func (cw *changeWriter) HandleChange(k fs.ChangeKind, p string, f os.FileInfo, err error) error {
+	if err != nil {
+		return err
+	}
+	if k == fs.ChangeKindDelete {
+		whiteOutDir := filepath.Dir(p)
+		whiteOutBase := filepath.Base(p)
+		whiteOut := filepath.Join(whiteOutDir, whiteoutPrefix+whiteOutBase)
+		hdr := &tar.Header{
+			Typeflag:   tar.TypeReg,
+			Name:       whiteOut[1:],
+			Size:       0,
+			ModTime:    cw.whiteoutT,
+			AccessTime: cw.whiteoutT,
+			ChangeTime: cw.whiteoutT,
+		}
+		if err := cw.tw.WriteHeader(hdr); err != nil {
+			return errors.Wrap(err, "failed to write whiteout header")
+		}
+	} else {
+		var (
+			link   string
+			err    error
+			source = filepath.Join(cw.source, p)
+		)
+
+		if f.Mode()&os.ModeSymlink != 0 {
+			if link, err = os.Readlink(source); err != nil {
+				return err
+			}
+		}
+
+		hdr, err := tar.FileInfoHeader(f, link)
+		if err != nil {
+			return err
+		}
+
+		hdr.Mode = int64(chmodTarEntry(os.FileMode(hdr.Mode)))
+
+		name := p
+		if strings.HasPrefix(name, string(filepath.Separator)) {
+			name, err = filepath.Rel(string(filepath.Separator), name)
+			if err != nil {
+				return errors.Wrap(err, "failed to make path relative")
+			}
+		}
+		name, err = tarName(name)
+		if err != nil {
+			return errors.Wrap(err, "cannot canonicalize path")
+		}
+		// suffix with '/' for directories
+		if f.IsDir() && !strings.HasSuffix(name, "/") {
+			name += "/"
+		}
+		hdr.Name = name
+
+		if err := setHeaderForSpecialDevice(hdr, name, f); err != nil {
+			return errors.Wrap(err, "failed to set device headers")
+		}
+
+		// additionalLinks stores file names which must be linked to
+		// this file when this file is added
+		var additionalLinks []string
+		inode, isHardlink := fs.GetLinkInfo(f)
+		if isHardlink {
+			// If the inode has a source, always link to it
+			if source, ok := cw.inodeSrc[inode]; ok {
+				hdr.Typeflag = tar.TypeLink
+				hdr.Linkname = source
+				hdr.Size = 0
+			} else {
+				if k == fs.ChangeKindUnmodified {
+					cw.inodeRefs[inode] = append(cw.inodeRefs[inode], name)
+					return nil
+				}
+				cw.inodeSrc[inode] = name
+				additionalLinks = cw.inodeRefs[inode]
+				delete(cw.inodeRefs, inode)
+			}
+		} else if k == fs.ChangeKindUnmodified {
+			// Nothing to write to diff
+			return nil
+		}
+
+		if capability, err := getxattr(source, "security.capability"); err != nil {
+			return errors.Wrap(err, "failed to get capabilities xattr")
+		} else if capability != nil {
+			if hdr.PAXRecords == nil {
+				hdr.PAXRecords = map[string]string{}
+			}
+			hdr.PAXRecords[paxSchilyXattr+"security.capability"] = string(capability)
+		}
+
+		if err := cw.includeParents(hdr); err != nil {
+			return err
+		}
+		if err := cw.tw.WriteHeader(hdr); err != nil {
+			return errors.Wrap(err, "failed to write file header")
+		}
+
+		if hdr.Typeflag == tar.TypeReg && hdr.Size > 0 {
+			file, err := open(source)
+			if err != nil {
+				return errors.Wrapf(err, "failed to open path: %v", source)
+			}
+			defer file.Close()
+
+			buf := bufferPool.Get().(*[]byte)
+			n, err := io.CopyBuffer(cw.tw, file, *buf)
+			bufferPool.Put(buf)
+			if err != nil {
+				return errors.Wrap(err, "failed to copy")
+			}
+			if n != hdr.Size {
+				return errors.New("short write copying file")
+			}
+		}
+
+		if additionalLinks != nil {
+			source = hdr.Name
+			for _, extra := range additionalLinks {
+				hdr.Name = extra
+				hdr.Typeflag = tar.TypeLink
+				hdr.Linkname = source
+				hdr.Size = 0
+
+				if err := cw.includeParents(hdr); err != nil {
+					return err
+				}
+				if err := cw.tw.WriteHeader(hdr); err != nil {
+					return errors.Wrap(err, "failed to write file header")
+				}
+			}
+		}
+	}
+	return nil
+}
+
+func (cw *changeWriter) Close() error {
+	if err := cw.tw.Close(); err != nil {
+		return errors.Wrap(err, "failed to close tar writer")
+	}
+	return nil
+}
+
+func (cw *changeWriter) includeParents(hdr *tar.Header) error {
+	name := strings.TrimRight(hdr.Name, "/")
+	fname := filepath.Join(cw.source, name)
+	parent := filepath.Dir(name)
+	pname := filepath.Join(cw.source, parent)
+
+	// Do not include root directory as parent
+	if fname != cw.source && pname != cw.source {
+		_, ok := cw.addedDirs[parent]
+		if !ok {
+			cw.addedDirs[parent] = struct{}{}
+			fi, err := os.Stat(pname)
+			if err != nil {
+				return err
+			}
+			if err := cw.HandleChange(fs.ChangeKindModify, parent, fi, nil); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
 func copyBuffered(ctx context.Context, dst io.Writer, src io.Reader) (written int64, err error) {
 	buf := bufferPool.Get().(*[]byte)
 	defer bufferPool.Put(buf)
--- a/vendor/github.com/containerd/containerd/archive/tar_opts.go
+++ b/vendor/github.com/containerd/containerd/archive/tar_opts.go
@ -0,0 +1,4 @@
+package archive
+
+// ApplyOpt allows setting mutable archive apply properties on creation
+type ApplyOpt func(options *ApplyOptions) error
--- a/vendor/github.com/containerd/containerd/archive/tar_opts_unix.go
+++ b/vendor/github.com/containerd/containerd/archive/tar_opts_unix.go
@ -0,0 +1,7 @@
+// +build !windows
+
+package archive
+
+// ApplyOptions provides additional options for an Apply operation
+type ApplyOptions struct {
+}
--- a/vendor/github.com/containerd/containerd/archive/tar_opts_windows.go
+++ b/vendor/github.com/containerd/containerd/archive/tar_opts_windows.go
@ -0,0 +1,28 @@
+// +build windows
+
+package archive
+
+// ApplyOptions provides additional options for an Apply operation
+type ApplyOptions struct {
+	ParentLayerPaths        []string // Parent layer paths used for Windows layer apply
+	IsWindowsContainerLayer bool     // True if the tar stream to be applied is a Windows Container Layer
+}
+
+// WithParentLayers adds parent layers to the apply process this is required
+// for all Windows layers except the base layer.
+func WithParentLayers(parentPaths []string) ApplyOpt {
+	return func(options *ApplyOptions) error {
+		options.ParentLayerPaths = parentPaths
+		return nil
+	}
+}
+
+// AsWindowsContainerLayer indicates that the tar stream to apply is that of
+// a Windows Container Layer. The caller must be holding SeBackupPrivilege and
+// SeRestorePrivilege.
+func AsWindowsContainerLayer() ApplyOpt {
+	return func(options *ApplyOptions) error {
+		options.IsWindowsContainerLayer = true
+		return nil
+	}
+}
--- a/vendor/github.com/containerd/containerd/archive/tar_unix.go
+++ b/vendor/github.com/containerd/containerd/archive/tar_unix.go
@ -3,6 +3,7 @@
 package archive

 import (
+	"context"
 	"os"
 	"sync"
 	"syscall"
@ -28,11 +29,14 @@ func setHeaderForSpecialDevice(hdr *tar.Header, name string, fi os.FileInfo) err
 		return errors.New("unsupported stat type")
 	}

+	// Rdev is int32 on darwin/bsd, int64 on linux/solaris
+	rdev := uint64(s.Rdev) // nolint: unconvert
+
 	// Currently go does not fill in the major/minors
 	if s.Mode&syscall.S_IFBLK != 0 ||
 		s.Mode&syscall.S_IFCHR != 0 {
-		hdr.Devmajor = int64(unix.Major(uint64(s.Rdev)))
-		hdr.Devminor = int64(unix.Minor(uint64(s.Rdev)))
+		hdr.Devmajor = int64(unix.Major(rdev))
+		hdr.Devminor = int64(unix.Minor(rdev))
 	}

 	return nil
@ -128,3 +132,9 @@ func getxattr(path, attr string) ([]byte, error) {
 func setxattr(path, key, value string) error {
 	return sysx.LSetxattr(path, key, []byte(value), 0)
 }
+
+// apply applies a tar stream of an OCI style diff tar.
+// See https://github.com/opencontainers/image-spec/blob/master/layer.md#applying-changesets
+func apply(ctx context.Context, root string, tr *tar.Reader, options ApplyOptions) (size int64, err error) {
+	return applyNaive(ctx, root, tr, options)
+}
--- a/vendor/github.com/containerd/containerd/archive/tar_windows.go
+++ b/vendor/github.com/containerd/containerd/archive/tar_windows.go
@ -1,15 +1,55 @@
+// +build windows
+
 package archive

 import (
+	"bufio"
+	"context"
+	"encoding/base64"
 	"errors"
 	"fmt"
+	"io"
 	"os"
+	"path"
+	"path/filepath"
+	"strconv"
 	"strings"
+	"syscall"

+	"github.com/Microsoft/go-winio"
+	"github.com/Microsoft/hcsshim"
+	"github.com/containerd/containerd/log"
 	"github.com/containerd/containerd/sys"
 	"github.com/dmcgowan/go-tar"
 )

+const (
+	// MSWINDOWS pax vendor extensions
+	hdrMSWindowsPrefix = "MSWINDOWS."
+
+	hdrFileAttributes        = hdrMSWindowsPrefix + "fileattr"
+	hdrSecurityDescriptor    = hdrMSWindowsPrefix + "sd"
+	hdrRawSecurityDescriptor = hdrMSWindowsPrefix + "rawsd"
+	hdrMountPoint            = hdrMSWindowsPrefix + "mountpoint"
+	hdrEaPrefix              = hdrMSWindowsPrefix + "xattr."
+
+	// LIBARCHIVE pax vendor extensions
+	hdrLibArchivePrefix = "LIBARCHIVE."
+
+	hdrCreateTime = hdrLibArchivePrefix + "creationtime"
+)
+
+var (
+	// mutatedFiles is a list of files that are mutated by the import process
+	// and must be backed up and restored.
+	mutatedFiles = map[string]string{
+		"UtilityVM/Files/EFI/Microsoft/Boot/BCD":      "bcd.bak",
+		"UtilityVM/Files/EFI/Microsoft/Boot/BCD.LOG":  "bcd.log.bak",
+		"UtilityVM/Files/EFI/Microsoft/Boot/BCD.LOG1": "bcd.log1.bak",
+		"UtilityVM/Files/EFI/Microsoft/Boot/BCD.LOG2": "bcd.log2.bak",
+	}
+)
+
 // tarName returns platform-specific filepath
 // to canonical posix-style path for tar archival. p is relative
 // path.
@ -101,3 +141,286 @@ func setxattr(path, key, value string) error {
 	// since xattrs should not exist in windows diff archives
 	return errors.New("xattrs not supported on Windows")
 }
+
+// apply applies a tar stream of an OCI style diff tar of a Windows layer.
+// See https://github.com/opencontainers/image-spec/blob/master/layer.md#applying-changesets
+func apply(ctx context.Context, root string, tr *tar.Reader, options ApplyOptions) (size int64, err error) {
+	if options.IsWindowsContainerLayer {
+		return applyWindowsLayer(ctx, root, tr, options)
+	}
+	return applyNaive(ctx, root, tr, options)
+}
+
+// applyWindowsLayer applies a tar stream of an OCI style diff tar of a Windows layer.
+// See https://github.com/opencontainers/image-spec/blob/master/layer.md#applying-changesets
+func applyWindowsLayer(ctx context.Context, root string, tr *tar.Reader, options ApplyOptions) (size int64, err error) {
+	home, id := filepath.Split(root)
+	info := hcsshim.DriverInfo{
+		HomeDir: home,
+	}
+
+	w, err := hcsshim.NewLayerWriter(info, id, options.ParentLayerPaths)
+	if err != nil {
+		return 0, err
+	}
+	defer func() {
+		if err := w.Close(); err != nil {
+			log.G(ctx).Errorf("failed to close layer writer: %v", err)
+		}
+	}()
+
+	buf := bufio.NewWriter(nil)
+	hdr, nextErr := tr.Next()
+	// Iterate through the files in the archive.
+	for {
+		select {
+		case <-ctx.Done():
+			return 0, ctx.Err()
+		default:
+		}
+
+		if nextErr == io.EOF {
+			// end of tar archive
+			break
+		}
+		if nextErr != nil {
+			return 0, nextErr
+		}
+
+		// Note: path is used instead of filepath to prevent OS specific handling
+		// of the tar path
+		base := path.Base(hdr.Name)
+		if strings.HasPrefix(base, whiteoutPrefix) {
+			dir := path.Dir(hdr.Name)
+			originalBase := base[len(whiteoutPrefix):]
+			originalPath := path.Join(dir, originalBase)
+			if err := w.Remove(filepath.FromSlash(originalPath)); err != nil {
+				return 0, err
+			}
+			hdr, nextErr = tr.Next()
+		} else if hdr.Typeflag == tar.TypeLink {
+			err := w.AddLink(filepath.FromSlash(hdr.Name), filepath.FromSlash(hdr.Linkname))
+			if err != nil {
+				return 0, err
+			}
+			hdr, nextErr = tr.Next()
+		} else {
+			name, fileSize, fileInfo, err := fileInfoFromHeader(hdr)
+			if err != nil {
+				return 0, err
+			}
+			if err := w.Add(filepath.FromSlash(name), fileInfo); err != nil {
+				return 0, err
+			}
+			size += fileSize
+			hdr, nextErr = tarToBackupStreamWithMutatedFiles(buf, w, tr, hdr, root)
+		}
+	}
+
+	return
+}
+
+// fileInfoFromHeader retrieves basic Win32 file information from a tar header, using the additional metadata written by
+// WriteTarFileFromBackupStream.
+func fileInfoFromHeader(hdr *tar.Header) (name string, size int64, fileInfo *winio.FileBasicInfo, err error) {
+	name = hdr.Name
+	if hdr.Typeflag == tar.TypeReg || hdr.Typeflag == tar.TypeRegA {
+		size = hdr.Size
+	}
+	fileInfo = &winio.FileBasicInfo{
+		LastAccessTime: syscall.NsecToFiletime(hdr.AccessTime.UnixNano()),
+		LastWriteTime:  syscall.NsecToFiletime(hdr.ModTime.UnixNano()),
+		ChangeTime:     syscall.NsecToFiletime(hdr.ChangeTime.UnixNano()),
+
+		// Default CreationTime to ModTime, updated below if MSWINDOWS.createtime exists
+		CreationTime: syscall.NsecToFiletime(hdr.ModTime.UnixNano()),
+	}
+	if attrStr, ok := hdr.PAXRecords[hdrFileAttributes]; ok {
+		attr, err := strconv.ParseUint(attrStr, 10, 32)
+		if err != nil {
+			return "", 0, nil, err
+		}
+		fileInfo.FileAttributes = uintptr(attr)
+	} else {
+		if hdr.Typeflag == tar.TypeDir {
+			fileInfo.FileAttributes |= syscall.FILE_ATTRIBUTE_DIRECTORY
+		}
+	}
+	if createStr, ok := hdr.PAXRecords[hdrCreateTime]; ok {
+		createTime, err := parsePAXTime(createStr)
+		if err != nil {
+			return "", 0, nil, err
+		}
+		fileInfo.CreationTime = syscall.NsecToFiletime(createTime.UnixNano())
+	}
+	return
+}
+
+// tarToBackupStreamWithMutatedFiles reads data from a tar stream and
+// writes it to a backup stream, and also saves any files that will be mutated
+// by the import layer process to a backup location.
+func tarToBackupStreamWithMutatedFiles(buf *bufio.Writer, w io.Writer, t *tar.Reader, hdr *tar.Header, root string) (nextHdr *tar.Header, err error) {
+	var (
+		bcdBackup       *os.File
+		bcdBackupWriter *winio.BackupFileWriter
+	)
+	if backupPath, ok := mutatedFiles[hdr.Name]; ok {
+		bcdBackup, err = os.Create(filepath.Join(root, backupPath))
+		if err != nil {
+			return nil, err
+		}
+		defer func() {
+			cerr := bcdBackup.Close()
+			if err == nil {
+				err = cerr
+			}
+		}()
+
+		bcdBackupWriter = winio.NewBackupFileWriter(bcdBackup, false)
+		defer func() {
+			cerr := bcdBackupWriter.Close()
+			if err == nil {
+				err = cerr
+			}
+		}()
+
+		buf.Reset(io.MultiWriter(w, bcdBackupWriter))
+	} else {
+		buf.Reset(w)
+	}
+
+	defer func() {
+		ferr := buf.Flush()
+		if err == nil {
+			err = ferr
+		}
+	}()
+
+	return writeBackupStreamFromTarFile(buf, t, hdr)
+}
+
+// writeBackupStreamFromTarFile writes a Win32 backup stream from the current tar file. Since this function may process multiple
+// tar file entries in order to collect all the alternate data streams for the file, it returns the next
+// tar file that was not processed, or io.EOF is there are no more.
+func writeBackupStreamFromTarFile(w io.Writer, t *tar.Reader, hdr *tar.Header) (*tar.Header, error) {
+	bw := winio.NewBackupStreamWriter(w)
+	var sd []byte
+	var err error
+	// Maintaining old SDDL-based behavior for backward compatibility.  All new tar headers written
+	// by this library will have raw binary for the security descriptor.
+	if sddl, ok := hdr.PAXRecords[hdrSecurityDescriptor]; ok {
+		sd, err = winio.SddlToSecurityDescriptor(sddl)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if sdraw, ok := hdr.PAXRecords[hdrRawSecurityDescriptor]; ok {
+		sd, err = base64.StdEncoding.DecodeString(sdraw)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if len(sd) != 0 {
+		bhdr := winio.BackupHeader{
+			Id:   winio.BackupSecurity,
+			Size: int64(len(sd)),
+		}
+		err := bw.WriteHeader(&bhdr)
+		if err != nil {
+			return nil, err
+		}
+		_, err = bw.Write(sd)
+		if err != nil {
+			return nil, err
+		}
+	}
+	var eas []winio.ExtendedAttribute
+	for k, v := range hdr.PAXRecords {
+		if !strings.HasPrefix(k, hdrEaPrefix) {
+			continue
+		}
+		data, err := base64.StdEncoding.DecodeString(v)
+		if err != nil {
+			return nil, err
+		}
+		eas = append(eas, winio.ExtendedAttribute{
+			Name:  k[len(hdrEaPrefix):],
+			Value: data,
+		})
+	}
+	if len(eas) != 0 {
+		eadata, err := winio.EncodeExtendedAttributes(eas)
+		if err != nil {
+			return nil, err
+		}
+		bhdr := winio.BackupHeader{
+			Id:   winio.BackupEaData,
+			Size: int64(len(eadata)),
+		}
+		err = bw.WriteHeader(&bhdr)
+		if err != nil {
+			return nil, err
+		}
+		_, err = bw.Write(eadata)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if hdr.Typeflag == tar.TypeSymlink {
+		_, isMountPoint := hdr.PAXRecords[hdrMountPoint]
+		rp := winio.ReparsePoint{
+			Target:       filepath.FromSlash(hdr.Linkname),
+			IsMountPoint: isMountPoint,
+		}
+		reparse := winio.EncodeReparsePoint(&rp)
+		bhdr := winio.BackupHeader{
+			Id:   winio.BackupReparseData,
+			Size: int64(len(reparse)),
+		}
+		err := bw.WriteHeader(&bhdr)
+		if err != nil {
+			return nil, err
+		}
+		_, err = bw.Write(reparse)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if hdr.Typeflag == tar.TypeReg || hdr.Typeflag == tar.TypeRegA {
+		bhdr := winio.BackupHeader{
+			Id:   winio.BackupData,
+			Size: hdr.Size,
+		}
+		err := bw.WriteHeader(&bhdr)
+		if err != nil {
+			return nil, err
+		}
+		_, err = io.Copy(bw, t)
+		if err != nil {
+			return nil, err
+		}
+	}
+	// Copy all the alternate data streams and return the next non-ADS header.
+	for {
+		ahdr, err := t.Next()
+		if err != nil {
+			return nil, err
+		}
+		if ahdr.Typeflag != tar.TypeReg || !strings.HasPrefix(ahdr.Name, hdr.Name+":") {
+			return ahdr, nil
+		}
+		bhdr := winio.BackupHeader{
+			Id:   winio.BackupAlternateData,
+			Size: ahdr.Size,
+			Name: ahdr.Name[len(hdr.Name):] + ":$DATA",
+		}
+		err = bw.WriteHeader(&bhdr)
+		if err != nil {
+			return nil, err
+		}
+		_, err = io.Copy(bw, t)
+		if err != nil {
+			return nil, err
+		}
+	}
+}
--- a/vendor/github.com/containerd/containerd/cio/io.go
+++ b/vendor/github.com/containerd/containerd/cio/io.go
@ -8,7 +8,7 @@ import (
 	"sync"
 )

-// Config holds the io configurations.
+// Config holds the IO configurations.
 type Config struct {
 	// Terminal is true if one has been allocated
 	Terminal bool
@ -24,48 +24,17 @@ type Config struct {
 type IO interface {
 	// Config returns the IO configuration.
 	Config() Config
-	// Cancel aborts all current io operations
+	// Cancel aborts all current io operations.
 	Cancel()
-	// Wait blocks until all io copy operations have completed
+	// Wait blocks until all io copy operations have completed.
 	Wait()
-	// Close cleans up all open io resources
+	// Close cleans up all open io resources. Cancel() is always called before
+	// Close()
 	Close() error
 }

-// cio is a basic container IO implementation.
-type cio struct {
-	config Config
-
-	closer *wgCloser
-}
-
-func (c *cio) Config() Config {
-	return c.config
-}
-
-func (c *cio) Cancel() {
-	if c.closer == nil {
-		return
-	}
-	c.closer.Cancel()
-}
-
-func (c *cio) Wait() {
-	if c.closer == nil {
-		return
-	}
-	c.closer.Wait()
-}
-
-func (c *cio) Close() error {
-	if c.closer == nil {
-		return nil
-	}
-	return c.closer.Close()
-}
-
-// Creation creates new IO sets for a task
-type Creation func(id string) (IO, error)
+// Creator creates new IO sets for a task
+type Creator func(id string) (IO, error)

 // Attach allows callers to reattach to running tasks
 //
@ -74,123 +43,138 @@ type Creation func(id string) (IO, error)
 // will be sent only to the first reads
 type Attach func(*FIFOSet) (IO, error)

-// NewIO returns an Creation that will provide IO sets without a terminal
-func NewIO(stdin io.Reader, stdout, stderr io.Writer) Creation {
-	return NewIOWithTerminal(stdin, stdout, stderr, false)
-}
-
-// NewIOWithTerminal creates a new io set with the provied io.Reader/Writers for use with a terminal
-func NewIOWithTerminal(stdin io.Reader, stdout, stderr io.Writer, terminal bool) Creation {
-	return func(id string) (_ IO, err error) {
-		paths, err := NewFifos(id)
-		if err != nil {
-			return nil, err
-		}
-		defer func() {
-			if err != nil && paths.Dir != "" {
-				os.RemoveAll(paths.Dir)
-			}
-		}()
-		cfg := Config{
-			Terminal: terminal,
-			Stdout:   paths.Out,
-			Stderr:   paths.Err,
-			Stdin:    paths.In,
-		}
-		i := &cio{config: cfg}
-		set := &ioSet{
-			in:  stdin,
-			out: stdout,
-			err: stderr,
-		}
-		closer, err := copyIO(paths, set, cfg.Terminal)
-		if err != nil {
-			return nil, err
-		}
-		i.closer = closer
-		return i, nil
-	}
-}
-
-// WithAttach attaches the existing io for a task to the provided io.Reader/Writers
-func WithAttach(stdin io.Reader, stdout, stderr io.Writer) Attach {
-	return func(paths *FIFOSet) (IO, error) {
-		if paths == nil {
-			return nil, fmt.Errorf("cannot attach to existing fifos")
-		}
-		cfg := Config{
-			Terminal: paths.Terminal,
-			Stdout:   paths.Out,
-			Stderr:   paths.Err,
-			Stdin:    paths.In,
-		}
-		i := &cio{config: cfg}
-		set := &ioSet{
-			in:  stdin,
-			out: stdout,
-			err: stderr,
-		}
-		closer, err := copyIO(paths, set, cfg.Terminal)
-		if err != nil {
-			return nil, err
-		}
-		i.closer = closer
-		return i, nil
-	}
-}
-
-// Stdio returns an IO set to be used for a task
-// that outputs the container's IO as the current processes Stdio
-func Stdio(id string) (IO, error) {
-	return NewIO(os.Stdin, os.Stdout, os.Stderr)(id)
-}
-
-// StdioTerminal will setup the IO for the task to use a terminal
-func StdioTerminal(id string) (IO, error) {
-	return NewIOWithTerminal(os.Stdin, os.Stdout, os.Stderr, true)(id)
-}
-
-// NullIO redirects the container's IO into /dev/null
-func NullIO(id string) (IO, error) {
-	return &cio{}, nil
-}
-
-// FIFOSet is a set of fifos for use with tasks
+// FIFOSet is a set of file paths to FIFOs for a task's standard IO streams
 type FIFOSet struct {
-	// Dir is the directory holding the task fifos
-	Dir string
-	// In, Out, and Err fifo paths
-	In, Out, Err string
-	// Terminal returns true if a terminal is being used for the task
-	Terminal bool
+	Config
+	close func() error
 }

-type ioSet struct {
-	in       io.Reader
-	out, err io.Writer
-}
-
-type wgCloser struct {
-	wg     *sync.WaitGroup
-	dir    string
-	set    []io.Closer
-	cancel context.CancelFunc
-}
-
-func (g *wgCloser) Wait() {
-	g.wg.Wait()
-}
-
-func (g *wgCloser) Close() error {
-	for _, f := range g.set {
-		f.Close()
-	}
-	if g.dir != "" {
-		return os.RemoveAll(g.dir)
+// Close the FIFOSet
+func (f *FIFOSet) Close() error {
+	if f.close != nil {
+		return f.close()
 	}
 	return nil
 }

-func (g *wgCloser) Cancel() {
-	g.cancel()
+// NewFIFOSet returns a new FIFOSet from a Config and a close function
+func NewFIFOSet(config Config, close func() error) *FIFOSet {
+	return &FIFOSet{Config: config, close: close}
 }
+
+// Streams used to configure a Creator or Attach
+type Streams struct {
+	Stdin    io.Reader
+	Stdout   io.Writer
+	Stderr   io.Writer
+	Terminal bool
+}
+
+// Opt customize options for creating a Creator or Attach
+type Opt func(*Streams)
+
+// WithStdio sets stream options to the standard input/output streams
+func WithStdio(opt *Streams) {
+	WithStreams(os.Stdin, os.Stdout, os.Stderr)(opt)
+}
+
+// WithTerminal sets the terminal option
+func WithTerminal(opt *Streams) {
+	opt.Terminal = true
+}
+
+// WithStreams sets the stream options to the specified Reader and Writers
+func WithStreams(stdin io.Reader, stdout, stderr io.Writer) Opt {
+	return func(opt *Streams) {
+		opt.Stdin = stdin
+		opt.Stdout = stdout
+		opt.Stderr = stderr
+	}
+}
+
+// NewCreator returns an IO creator from the options
+func NewCreator(opts ...Opt) Creator {
+	streams := &Streams{}
+	for _, opt := range opts {
+		opt(streams)
+	}
+	return func(id string) (IO, error) {
+		// TODO: accept root as a param
+		root := "/run/containerd/fifo"
+		fifos, err := NewFIFOSetInDir(root, id, streams.Terminal)
+		if err != nil {
+			return nil, err
+		}
+		return copyIO(fifos, streams)
+	}
+}
+
+// NewAttach attaches the existing io for a task to the provided io.Reader/Writers
+func NewAttach(opts ...Opt) Attach {
+	streams := &Streams{}
+	for _, opt := range opts {
+		opt(streams)
+	}
+	return func(fifos *FIFOSet) (IO, error) {
+		if fifos == nil {
+			return nil, fmt.Errorf("cannot attach, missing fifos")
+		}
+		return copyIO(fifos, streams)
+	}
+}
+
+// NullIO redirects the container's IO into /dev/null
+func NullIO(_ string) (IO, error) {
+	return &cio{}, nil
+}
+
+// cio is a basic container IO implementation.
+type cio struct {
+	config  Config
+	wg      *sync.WaitGroup
+	closers []io.Closer
+	cancel  context.CancelFunc
+}
+
+func (c *cio) Config() Config {
+	return c.config
+}
+
+func (c *cio) Wait() {
+	if c.wg != nil {
+		c.wg.Wait()
+	}
+}
+
+func (c *cio) Close() error {
+	var lastErr error
+	for _, closer := range c.closers {
+		if closer == nil {
+			continue
+		}
+		if err := closer.Close(); err != nil {
+			lastErr = err
+		}
+	}
+	return lastErr
+}
+
+func (c *cio) Cancel() {
+	if c.cancel != nil {
+		c.cancel()
+	}
+}
+
+type pipes struct {
+	Stdin  io.WriteCloser
+	Stdout io.ReadCloser
+	Stderr io.ReadCloser
+}
+
+// DirectIO allows task IO to be handled externally by the caller
+type DirectIO struct {
+	pipes
+	cio
+}
+
+var _ IO = &DirectIO{}
--- a/vendor/github.com/containerd/containerd/cio/io_unix.go
+++ b/vendor/github.com/containerd/containerd/cio/io_unix.go
@ -12,173 +12,115 @@ import (
 	"syscall"

 	"github.com/containerd/fifo"
+	"github.com/pkg/errors"
 )

-// NewFifos returns a new set of fifos for the task
-func NewFifos(id string) (*FIFOSet, error) {
-	root := "/run/containerd/fifo"
-	if err := os.MkdirAll(root, 0700); err != nil {
-		return nil, err
+// NewFIFOSetInDir returns a new FIFOSet with paths in a temporary directory under root
+func NewFIFOSetInDir(root, id string, terminal bool) (*FIFOSet, error) {
+	if root != "" {
+		if err := os.MkdirAll(root, 0700); err != nil {
+			return nil, err
+		}
 	}
 	dir, err := ioutil.TempDir(root, "")
 	if err != nil {
 		return nil, err
 	}
-	return &FIFOSet{
-		Dir: dir,
-		In:  filepath.Join(dir, id+"-stdin"),
-		Out: filepath.Join(dir, id+"-stdout"),
-		Err: filepath.Join(dir, id+"-stderr"),
-	}, nil
+	closer := func() error {
+		return os.RemoveAll(dir)
+	}
+	return NewFIFOSet(Config{
+		Stdin:    filepath.Join(dir, id+"-stdin"),
+		Stdout:   filepath.Join(dir, id+"-stdout"),
+		Stderr:   filepath.Join(dir, id+"-stderr"),
+		Terminal: terminal,
+	}, closer), nil
 }

-func copyIO(fifos *FIFOSet, ioset *ioSet, tty bool) (_ *wgCloser, err error) {
-	var (
-		f           io.ReadWriteCloser
-		set         []io.Closer
-		ctx, cancel = context.WithCancel(context.Background())
-		wg          = &sync.WaitGroup{}
-	)
-	defer func() {
-		if err != nil {
-			for _, f := range set {
-				f.Close()
-			}
-			cancel()
-		}
-	}()
-
-	if f, err = fifo.OpenFifo(ctx, fifos.In, syscall.O_WRONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700); err != nil {
-		return nil, err
-	}
-	set = append(set, f)
-	go func(w io.WriteCloser) {
-		io.Copy(w, ioset.in)
-		w.Close()
-	}(f)
-
-	if f, err = fifo.OpenFifo(ctx, fifos.Out, syscall.O_RDONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700); err != nil {
-		return nil, err
-	}
-	set = append(set, f)
-	wg.Add(1)
-	go func(r io.ReadCloser) {
-		io.Copy(ioset.out, r)
-		r.Close()
-		wg.Done()
-	}(f)
-
-	if f, err = fifo.OpenFifo(ctx, fifos.Err, syscall.O_RDONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700); err != nil {
-		return nil, err
-	}
-	set = append(set, f)
-
-	if !tty {
-		wg.Add(1)
-		go func(r io.ReadCloser) {
-			io.Copy(ioset.err, r)
-			r.Close()
-			wg.Done()
-		}(f)
-	}
-	return &wgCloser{
-		wg:     wg,
-		dir:    fifos.Dir,
-		set:    set,
-		cancel: cancel,
-	}, nil
-}
-
-// NewDirectIO returns an IO implementation that exposes the pipes directly
-func NewDirectIO(ctx context.Context, terminal bool) (*DirectIO, error) {
-	set, err := NewFifos("")
+func copyIO(fifos *FIFOSet, ioset *Streams) (*cio, error) {
+	var ctx, cancel = context.WithCancel(context.Background())
+	pipes, err := openFifos(ctx, fifos)
 	if err != nil {
+		cancel()
 		return nil, err
 	}
-	f := &DirectIO{
-		set:      set,
-		terminal: terminal,
+
+	if fifos.Stdin != "" {
+		go func() {
+			io.Copy(pipes.Stdin, ioset.Stdin)
+			pipes.Stdin.Close()
+		}()
 	}
+
+	var wg = &sync.WaitGroup{}
+	wg.Add(1)
+	go func() {
+		io.Copy(ioset.Stdout, pipes.Stdout)
+		pipes.Stdout.Close()
+		wg.Done()
+	}()
+
+	if !fifos.Terminal {
+		wg.Add(1)
+		go func() {
+			io.Copy(ioset.Stderr, pipes.Stderr)
+			pipes.Stderr.Close()
+			wg.Done()
+		}()
+	}
+	return &cio{
+		config:  fifos.Config,
+		wg:      wg,
+		closers: append(pipes.closers(), fifos),
+		cancel:  cancel,
+	}, nil
+}
+
+func openFifos(ctx context.Context, fifos *FIFOSet) (pipes, error) {
+	var err error
 	defer func() {
 		if err != nil {
-			f.Delete()
+			fifos.Close()
 		}
 	}()
-	if f.Stdin, err = fifo.OpenFifo(ctx, set.In, syscall.O_WRONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700); err != nil {
-		return nil, err
+
+	var f pipes
+	if fifos.Stdin != "" {
+		if f.Stdin, err = fifo.OpenFifo(ctx, fifos.Stdin, syscall.O_WRONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700); err != nil {
+			return f, errors.Wrapf(err, "failed to open stdin fifo")
+		}
 	}
-	if f.Stdout, err = fifo.OpenFifo(ctx, set.Out, syscall.O_RDONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700); err != nil {
-		f.Stdin.Close()
-		return nil, err
+	if fifos.Stdout != "" {
+		if f.Stdout, err = fifo.OpenFifo(ctx, fifos.Stdout, syscall.O_RDONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700); err != nil {
+			f.Stdin.Close()
+			return f, errors.Wrapf(err, "failed to open stdout fifo")
+		}
 	}
-	if f.Stderr, err = fifo.OpenFifo(ctx, set.Err, syscall.O_RDONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700); err != nil {
-		f.Stdin.Close()
-		f.Stdout.Close()
-		return nil, err
+	if fifos.Stderr != "" {
+		if f.Stderr, err = fifo.OpenFifo(ctx, fifos.Stderr, syscall.O_RDONLY|syscall.O_CREAT|syscall.O_NONBLOCK, 0700); err != nil {
+			f.Stdin.Close()
+			f.Stdout.Close()
+			return f, errors.Wrapf(err, "failed to open stderr fifo")
+		}
 	}
 	return f, nil
 }

-// DirectIO allows task IO to be handled externally by the caller
-type DirectIO struct {
-	Stdin  io.WriteCloser
-	Stdout io.ReadCloser
-	Stderr io.ReadCloser
-
-	set      *FIFOSet
-	terminal bool
+// NewDirectIO returns an IO implementation that exposes the IO streams as io.ReadCloser
+// and io.WriteCloser.
+func NewDirectIO(ctx context.Context, fifos *FIFOSet) (*DirectIO, error) {
+	ctx, cancel := context.WithCancel(ctx)
+	pipes, err := openFifos(ctx, fifos)
+	return &DirectIO{
+		pipes: pipes,
+		cio: cio{
+			config:  fifos.Config,
+			closers: append(pipes.closers(), fifos),
+			cancel:  cancel,
+		},
+	}, err
 }

-// IOCreate returns IO avaliable for use with task creation
-func (f *DirectIO) IOCreate(id string) (IO, error) {
-	return f, nil
-}
-
-// IOAttach returns IO avaliable for use with task attachment
-func (f *DirectIO) IOAttach(set *FIFOSet) (IO, error) {
-	return f, nil
-}
-
-// Config returns the Config
-func (f *DirectIO) Config() Config {
-	return Config{
-		Terminal: f.terminal,
-		Stdin:    f.set.In,
-		Stdout:   f.set.Out,
-		Stderr:   f.set.Err,
-	}
-}
-
-// Cancel stops any IO copy operations
-//
-// Not applicable for DirectIO
-func (f *DirectIO) Cancel() {
-	// nothing to cancel as all operations are handled externally
-}
-
-// Wait on any IO copy operations
-//
-// Not applicable for DirectIO
-func (f *DirectIO) Wait() {
-	// nothing to wait on as all operations are handled externally
-}
-
-// Close closes all open fds
-func (f *DirectIO) Close() error {
-	err := f.Stdin.Close()
-	if err2 := f.Stdout.Close(); err == nil {
-		err = err2
-	}
-	if err2 := f.Stderr.Close(); err == nil {
-		err = err2
-	}
-	return err
-}
-
-// Delete removes the underlying directory containing fifos
-func (f *DirectIO) Delete() error {
-	if f.set.Dir == "" {
-		return nil
-	}
-	return os.RemoveAll(f.set.Dir)
+func (p *pipes) closers() []io.Closer {
+	return []io.Closer{p.Stdin, p.Stdout, p.Stderr}
 }
--- a/vendor/github.com/containerd/containerd/cio/io_windows.go
+++ b/vendor/github.com/containerd/containerd/cio/io_windows.go
@ -13,25 +13,26 @@ import (

 const pipeRoot = `\\.\pipe`

-// NewFifos returns a new set of fifos for the task
-func NewFifos(id string) (*FIFOSet, error) {
-	return &FIFOSet{
-		In:  fmt.Sprintf(`%s\ctr-%s-stdin`, pipeRoot, id),
-		Out: fmt.Sprintf(`%s\ctr-%s-stdout`, pipeRoot, id),
-		Err: fmt.Sprintf(`%s\ctr-%s-stderr`, pipeRoot, id),
-	}, nil
+// NewFIFOSetInDir returns a new set of fifos for the task
+func NewFIFOSetInDir(_, id string, terminal bool) (*FIFOSet, error) {
+	return NewFIFOSet(Config{
+		Terminal: terminal,
+		Stdin:    fmt.Sprintf(`%s\ctr-%s-stdin`, pipeRoot, id),
+		Stdout:   fmt.Sprintf(`%s\ctr-%s-stdout`, pipeRoot, id),
+		Stderr:   fmt.Sprintf(`%s\ctr-%s-stderr`, pipeRoot, id),
+	}, nil), nil
 }

-func copyIO(fifos *FIFOSet, ioset *ioSet, tty bool) (_ *wgCloser, err error) {
+func copyIO(fifos *FIFOSet, ioset *Streams) (*cio, error) {
 	var (
 		wg  sync.WaitGroup
 		set []io.Closer
 	)

-	if fifos.In != "" {
-		l, err := winio.ListenPipe(fifos.In, nil)
+	if fifos.Stdin != "" {
+		l, err := winio.ListenPipe(fifos.Stdin, nil)
 		if err != nil {
-			return nil, errors.Wrapf(err, "failed to create stdin pipe %s", fifos.In)
+			return nil, errors.Wrapf(err, "failed to create stdin pipe %s", fifos.Stdin)
 		}
 		defer func(l net.Listener) {
 			if err != nil {
@ -43,19 +44,19 @@ func copyIO(fifos *FIFOSet, ioset *ioSet, tty bool) (_ *wgCloser, err error) {
 		go func() {
 			c, err := l.Accept()
 			if err != nil {
-				log.L.WithError(err).Errorf("failed to accept stdin connection on %s", fifos.In)
+				log.L.WithError(err).Errorf("failed to accept stdin connection on %s", fifos.Stdin)
 				return
 			}
-			io.Copy(c, ioset.in)
+			io.Copy(c, ioset.Stdin)
 			c.Close()
 			l.Close()
 		}()
 	}

-	if fifos.Out != "" {
-		l, err := winio.ListenPipe(fifos.Out, nil)
+	if fifos.Stdout != "" {
+		l, err := winio.ListenPipe(fifos.Stdout, nil)
 		if err != nil {
-			return nil, errors.Wrapf(err, "failed to create stdin pipe %s", fifos.Out)
+			return nil, errors.Wrapf(err, "failed to create stdin pipe %s", fifos.Stdout)
 		}
 		defer func(l net.Listener) {
 			if err != nil {
@ -69,19 +70,19 @@ func copyIO(fifos *FIFOSet, ioset *ioSet, tty bool) (_ *wgCloser, err error) {
 			defer wg.Done()
 			c, err := l.Accept()
 			if err != nil {
-				log.L.WithError(err).Errorf("failed to accept stdout connection on %s", fifos.Out)
+				log.L.WithError(err).Errorf("failed to accept stdout connection on %s", fifos.Stdout)
 				return
 			}
-			io.Copy(ioset.out, c)
+			io.Copy(ioset.Stdout, c)
 			c.Close()
 			l.Close()
 		}()
 	}

-	if !tty && fifos.Err != "" {
-		l, err := winio.ListenPipe(fifos.Err, nil)
+	if !fifos.Terminal && fifos.Stderr != "" {
+		l, err := winio.ListenPipe(fifos.Stderr, nil)
 		if err != nil {
-			return nil, errors.Wrapf(err, "failed to create stderr pipe %s", fifos.Err)
+			return nil, errors.Wrapf(err, "failed to create stderr pipe %s", fifos.Stderr)
 		}
 		defer func(l net.Listener) {
 			if err != nil {
@ -95,23 +96,29 @@ func copyIO(fifos *FIFOSet, ioset *ioSet, tty bool) (_ *wgCloser, err error) {
 			defer wg.Done()
 			c, err := l.Accept()
 			if err != nil {
-				log.L.WithError(err).Errorf("failed to accept stderr connection on %s", fifos.Err)
+				log.L.WithError(err).Errorf("failed to accept stderr connection on %s", fifos.Stderr)
 				return
 			}
-			io.Copy(ioset.err, c)
+			io.Copy(ioset.Stderr, c)
 			c.Close()
 			l.Close()
 		}()
 	}

-	return &wgCloser{
-		wg:  &wg,
-		dir: fifos.Dir,
-		set: set,
-		cancel: func() {
-			for _, l := range set {
-				l.Close()
-			}
-		},
-	}, nil
+	return &cio{config: fifos.Config, closers: set}, nil
+}
+
+// NewDirectIO returns an IO implementation that exposes the IO streams as io.ReadCloser
+// and io.WriteCloser.
+func NewDirectIO(stdin io.WriteCloser, stdout, stderr io.ReadCloser, terminal bool) *DirectIO {
+	return &DirectIO{
+		pipes: pipes{
+			Stdin:  stdin,
+			Stdout: stdout,
+			Stderr: stderr,
+		},
+		cio: cio{
+			config: Config{Terminal: terminal},
+		},
+	}
 }
--- a/vendor/github.com/containerd/containerd/container.go
+++ b/vendor/github.com/containerd/containerd/container.go
@ -3,6 +3,7 @@ package containerd
 import (
 	"context"
 	"encoding/json"
+	"os"
 	"path/filepath"
 	"strings"

@ -26,7 +27,7 @@ type Container interface {
 	// Delete removes the container
 	Delete(context.Context, ...DeleteOpts) error
 	// NewTask creates a new task based on the container metadata
-	NewTask(context.Context, cio.Creation, ...NewTaskOpts) (Task, error)
+	NewTask(context.Context, cio.Creator, ...NewTaskOpts) (Task, error)
 	// Spec returns the OCI runtime specification
 	Spec(context.Context) (*specs.Spec, error)
 	// Task returns the current task for the container
@ -162,7 +163,7 @@ func (c *container) Image(ctx context.Context) (Image, error) {
 	}, nil
 }

-func (c *container) NewTask(ctx context.Context, ioCreate cio.Creation, opts ...NewTaskOpts) (_ Task, err error) {
+func (c *container) NewTask(ctx context.Context, ioCreate cio.Creator, opts ...NewTaskOpts) (_ Task, err error) {
 	i, err := ioCreate(c.id)
 	if err != nil {
 		return nil, err
@ -288,20 +289,23 @@ func (c *container) get(ctx context.Context) (containers.Container, error) {
 	return c.client.ContainerService().Get(ctx, c.id)
 }

+// get the existing fifo paths from the task information stored by the daemon
 func attachExistingIO(response *tasks.GetResponse, ioAttach cio.Attach) (cio.IO, error) {
-	// get the existing fifo paths from the task information stored by the daemon
-	paths := &cio.FIFOSet{
-		Dir: getFifoDir([]string{
-			response.Process.Stdin,
-			response.Process.Stdout,
-			response.Process.Stderr,
-		}),
-		In:       response.Process.Stdin,
-		Out:      response.Process.Stdout,
-		Err:      response.Process.Stderr,
-		Terminal: response.Process.Terminal,
+	path := getFifoDir([]string{
+		response.Process.Stdin,
+		response.Process.Stdout,
+		response.Process.Stderr,
+	})
+	closer := func() error {
+		return os.RemoveAll(path)
 	}
-	return ioAttach(paths)
+	fifoSet := cio.NewFIFOSet(cio.Config{
+		Stdin:    response.Process.Stdin,
+		Stdout:   response.Process.Stdout,
+		Stderr:   response.Process.Stderr,
+		Terminal: response.Process.Terminal,
+	}, closer)
+	return ioAttach(fifoSet)
 }

 // getFifoDir looks for any non-empty path for a stdio fifo
--- a/vendor/github.com/containerd/containerd/container_opts_unix.go
+++ b/vendor/github.com/containerd/containerd/container_opts_unix.go
@ -6,7 +6,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"syscall"
@ -16,6 +15,7 @@ import (
 	"github.com/containerd/containerd/content"
 	"github.com/containerd/containerd/errdefs"
 	"github.com/containerd/containerd/images"
+	"github.com/containerd/containerd/linux/runctypes"
 	"github.com/containerd/containerd/mount"
 	"github.com/containerd/containerd/platforms"
 	"github.com/gogo/protobuf/proto"
@ -166,7 +166,7 @@ func withRemappedSnapshotBase(id string, i Image, uid, gid uint32, readonly bool
 		if err != nil {
 			return err
 		}
-		if err := remapRootFS(mounts, uid, gid); err != nil {
+		if err := remapRootFS(ctx, mounts, uid, gid); err != nil {
 			snapshotter.Remove(ctx, usernsID)
 			return err
 		}
@ -187,22 +187,10 @@ func withRemappedSnapshotBase(id string, i Image, uid, gid uint32, readonly bool
 	}
 }

-func remapRootFS(mounts []mount.Mount, uid, gid uint32) error {
-	root, err := ioutil.TempDir("", "ctd-remap")
-	if err != nil {
-		return err
-	}
-	defer os.Remove(root)
-	for _, m := range mounts {
-		if err := m.Mount(root); err != nil {
-			return err
-		}
-	}
-	err = filepath.Walk(root, incrementFS(root, uid, gid))
-	if uerr := mount.Unmount(root, 0); err == nil {
-		err = uerr
-	}
-	return err
+func remapRootFS(ctx context.Context, mounts []mount.Mount, uid, gid uint32) error {
+	return mount.WithTempMount(ctx, mounts, func(root string) error {
+		return filepath.Walk(root, incrementFS(root, uid, gid))
+	})
 }

 func incrementFS(root string, uidInc, gidInc uint32) filepath.WalkFunc {
@ -218,3 +206,19 @@ func incrementFS(root string, uidInc, gidInc uint32) filepath.WalkFunc {
 		return os.Lchown(path, u, g)
 	}
 }
+
+// WithNoPivotRoot instructs the runtime not to you pivot_root
+func WithNoPivotRoot(_ context.Context, _ *Client, info *TaskInfo) error {
+	if info.Options == nil {
+		info.Options = &runctypes.CreateOptions{
+			NoPivotRoot: true,
+		}
+		return nil
+	}
+	copts, ok := info.Options.(*runctypes.CreateOptions)
+	if !ok {
+		return errors.New("invalid options type, expected runctypes.CreateOptions")
+	}
+	copts.NoPivotRoot = true
+	return nil
+}
--- a/vendor/github.com/containerd/containerd/content/helpers.go
+++ b/vendor/github.com/containerd/containerd/content/helpers.go
@ -77,7 +77,7 @@ func Copy(ctx context.Context, cw Writer, r io.Reader, size int64, expected dige
 		r, err = seekReader(r, ws.Offset, size)
 		if err != nil {
 			if !isUnseekable(err) {
-				return errors.Wrapf(err, "unabled to resume write to %v", ws.Ref)
+				return errors.Wrapf(err, "unable to resume write to %v", ws.Ref)
 			}

 			// reader is unseekable, try to move the writer back to the start.
--- a/vendor/github.com/containerd/containerd/content/local/store_unix.go
+++ b/vendor/github.com/containerd/containerd/content/local/store_unix.go
@ -12,8 +12,7 @@ import (

 func getATime(fi os.FileInfo) time.Time {
 	if st, ok := fi.Sys().(*syscall.Stat_t); ok {
-		return time.Unix(int64(sys.StatAtime(st).Sec),
-			int64(sys.StatAtime(st).Nsec))
+		return sys.StatATimeAsTime(st)
 	}

 	return fi.ModTime()
--- a/vendor/github.com/containerd/containerd/content/local/writer.go
+++ b/vendor/github.com/containerd/containerd/content/local/writer.go
@ -2,6 +2,7 @@ package local

 import (
 	"context"
+	"io"
 	"os"
 	"path/filepath"
 	"runtime"
@ -167,5 +168,8 @@ func (w *writer) Truncate(size int64) error {
 	}
 	w.offset = 0
 	w.digester.Hash().Reset()
+	if _, err := w.fp.Seek(0, io.SeekStart); err != nil {
+		return err
+	}
 	return w.fp.Truncate(0)
 }
--- a/vendor/github.com/containerd/containerd/diff/walking/differ.go
+++ b/vendor/github.com/containerd/containerd/diff/walking/differ.go
@ -6,7 +6,6 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
-	"os"
 	"strings"
 	"time"

@ -90,60 +89,49 @@ func (s *walkingDiff) Apply(ctx context.Context, desc ocispec.Descriptor, mounts
 		}
 	}

-	dir, err := ioutil.TempDir("", "extract-")
-	if err != nil {
-		return emptyDesc, errors.Wrap(err, "failed to create temporary directory")
-	}
-	// We change RemoveAll to Remove so that we either leak a temp dir
-	// if it fails but not RM snapshot data. refer to #1868 #1785
-	defer os.Remove(dir)
-
-	if err := mount.All(mounts, dir); err != nil {
-		return emptyDesc, errors.Wrap(err, "failed to mount")
-	}
-	defer func() {
-		if uerr := mount.Unmount(dir, 0); uerr != nil {
-			if err == nil {
-				err = uerr
-			}
-		}
-	}()
-
-	ra, err := s.store.ReaderAt(ctx, desc.Digest)
-	if err != nil {
-		return emptyDesc, errors.Wrap(err, "failed to get reader from content store")
-	}
-	defer ra.Close()
-
-	r := content.NewReader(ra)
-	if isCompressed {
-		ds, err := compression.DecompressStream(r)
+	var ocidesc ocispec.Descriptor
+	if err := mount.WithTempMount(ctx, mounts, func(root string) error {
+		ra, err := s.store.ReaderAt(ctx, desc.Digest)
 		if err != nil {
-			return emptyDesc, err
+			return errors.Wrap(err, "failed to get reader from content store")
 		}
-		defer ds.Close()
-		r = ds
-	}
+		defer ra.Close()

-	digester := digest.Canonical.Digester()
-	rc := &readCounter{
-		r: io.TeeReader(r, digester.Hash()),
-	}
+		r := content.NewReader(ra)
+		if isCompressed {
+			ds, err := compression.DecompressStream(r)
+			if err != nil {
+				return err
+			}
+			defer ds.Close()
+			r = ds
+		}

-	if _, err := archive.Apply(ctx, dir, rc); err != nil {
+		digester := digest.Canonical.Digester()
+		rc := &readCounter{
+			r: io.TeeReader(r, digester.Hash()),
+		}
+
+		if _, err := archive.Apply(ctx, root, rc); err != nil {
+			return err
+		}
+
+		// Read any trailing data
+		if _, err := io.Copy(ioutil.Discard, rc); err != nil {
+			return err
+		}
+
+		ocidesc = ocispec.Descriptor{
+			MediaType: ocispec.MediaTypeImageLayer,
+			Size:      rc.c,
+			Digest:    digester.Digest(),
+		}
+		return nil
+
+	}); err != nil {
 		return emptyDesc, err
 	}
-
-	// Read any trailing data
-	if _, err := io.Copy(ioutil.Discard, rc); err != nil {
-		return emptyDesc, err
-	}
-
-	return ocispec.Descriptor{
-		MediaType: ocispec.MediaTypeImageLayer,
-		Size:      rc.c,
-		Digest:    digester.Digest(),
-	}, nil
+	return ocidesc, nil
 }

 // DiffMounts creates a diff between the given mounts and uploads the result
@ -168,108 +156,85 @@ func (s *walkingDiff) DiffMounts(ctx context.Context, lower, upper []mount.Mount
 	default:
 		return emptyDesc, errors.Wrapf(errdefs.ErrNotImplemented, "unsupported diff media type: %v", config.MediaType)
 	}
-	aDir, err := ioutil.TempDir("", "left-")
-	if err != nil {
-		return emptyDesc, errors.Wrap(err, "failed to create temporary directory")
-	}
-	defer os.Remove(aDir)

-	bDir, err := ioutil.TempDir("", "right-")
-	if err != nil {
-		return emptyDesc, errors.Wrap(err, "failed to create temporary directory")
-	}
-	defer os.Remove(bDir)
-
-	if err := mount.All(lower, aDir); err != nil {
-		return emptyDesc, errors.Wrap(err, "failed to mount")
-	}
-	defer func() {
-		if uerr := mount.Unmount(aDir, 0); uerr != nil {
-			if err == nil {
-				err = uerr
+	var ocidesc ocispec.Descriptor
+	if err := mount.WithTempMount(ctx, lower, func(lowerRoot string) error {
+		return mount.WithTempMount(ctx, upper, func(upperRoot string) error {
+			var newReference bool
+			if config.Reference == "" {
+				newReference = true
+				config.Reference = uniqueRef()
 			}
-		}
-	}()

-	if err := mount.All(upper, bDir); err != nil {
-		return emptyDesc, errors.Wrap(err, "failed to mount")
-	}
-	defer func() {
-		if uerr := mount.Unmount(bDir, 0); uerr != nil {
-			if err == nil {
-				err = uerr
+			cw, err := s.store.Writer(ctx, config.Reference, 0, "")
+			if err != nil {
+				return errors.Wrap(err, "failed to open writer")
 			}
-		}
-	}()
-
-	var newReference bool
-	if config.Reference == "" {
-		newReference = true
-		config.Reference = uniqueRef()
-	}
-
-	cw, err := s.store.Writer(ctx, config.Reference, 0, "")
-	if err != nil {
-		return emptyDesc, errors.Wrap(err, "failed to open writer")
-	}
-	defer func() {
-		if err != nil {
-			cw.Close()
-			if newReference {
-				if err := s.store.Abort(ctx, config.Reference); err != nil {
-					log.G(ctx).WithField("ref", config.Reference).Warnf("failed to delete diff upload")
+			defer func() {
+				if err != nil {
+					cw.Close()
+					if newReference {
+						if err := s.store.Abort(ctx, config.Reference); err != nil {
+							log.G(ctx).WithField("ref", config.Reference).Warnf("failed to delete diff upload")
+						}
+					}
+				}
+			}()
+			if !newReference {
+				if err := cw.Truncate(0); err != nil {
+					return err
 				}
 			}
-		}
-	}()
-	if !newReference {
-		if err := cw.Truncate(0); err != nil {
-			return emptyDesc, err
-		}
+
+			if isCompressed {
+				dgstr := digest.SHA256.Digester()
+				compressed, err := compression.CompressStream(cw, compression.Gzip)
+				if err != nil {
+					return errors.Wrap(err, "failed to get compressed stream")
+				}
+				err = archive.WriteDiff(ctx, io.MultiWriter(compressed, dgstr.Hash()), lowerRoot, upperRoot)
+				compressed.Close()
+				if err != nil {
+					return errors.Wrap(err, "failed to write compressed diff")
+				}
+
+				if config.Labels == nil {
+					config.Labels = map[string]string{}
+				}
+				config.Labels["containerd.io/uncompressed"] = dgstr.Digest().String()
+			} else {
+				if err = archive.WriteDiff(ctx, cw, lowerRoot, upperRoot); err != nil {
+					return errors.Wrap(err, "failed to write diff")
+				}
+			}
+
+			var commitopts []content.Opt
+			if config.Labels != nil {
+				commitopts = append(commitopts, content.WithLabels(config.Labels))
+			}
+
+			dgst := cw.Digest()
+			if err := cw.Commit(ctx, 0, dgst, commitopts...); err != nil {
+				return errors.Wrap(err, "failed to commit")
+			}
+
+			info, err := s.store.Info(ctx, dgst)
+			if err != nil {
+				return errors.Wrap(err, "failed to get info from content store")
+			}
+
+			ocidesc = ocispec.Descriptor{
+				MediaType: config.MediaType,
+				Size:      info.Size,
+				Digest:    info.Digest,
+			}
+			return nil
+		})
+	}); err != nil {
+		return emptyDesc, err
 	}

-	if isCompressed {
-		dgstr := digest.SHA256.Digester()
-		compressed, err := compression.CompressStream(cw, compression.Gzip)
-		if err != nil {
-			return emptyDesc, errors.Wrap(err, "failed to get compressed stream")
-		}
-		err = archive.WriteDiff(ctx, io.MultiWriter(compressed, dgstr.Hash()), aDir, bDir)
-		compressed.Close()
-		if err != nil {
-			return emptyDesc, errors.Wrap(err, "failed to write compressed diff")
-		}
-
-		if config.Labels == nil {
-			config.Labels = map[string]string{}
-		}
-		config.Labels["containerd.io/uncompressed"] = dgstr.Digest().String()
-	} else {
-		if err = archive.WriteDiff(ctx, cw, aDir, bDir); err != nil {
-			return emptyDesc, errors.Wrap(err, "failed to write diff")
-		}
-	}
-
-	var commitopts []content.Opt
-	if config.Labels != nil {
-		commitopts = append(commitopts, content.WithLabels(config.Labels))
-	}
-
-	dgst := cw.Digest()
-	if err := cw.Commit(ctx, 0, dgst, commitopts...); err != nil {
-		return emptyDesc, errors.Wrap(err, "failed to commit")
-	}
-
-	info, err := s.store.Info(ctx, dgst)
-	if err != nil {
-		return emptyDesc, errors.Wrap(err, "failed to get info from content store")
-	}
-
-	return ocispec.Descriptor{
-		MediaType: config.MediaType,
-		Size:      info.Size,
-		Digest:    info.Digest,
-	}, nil
+	return ocidesc, nil
 }

 type readCounter struct {
--- a/vendor/github.com/containerd/containerd/events/events.go
+++ b/vendor/github.com/containerd/containerd/events/events.go
@ -26,9 +26,9 @@ func (e *Envelope) Field(fieldpath []string) (string, bool) {
 	switch fieldpath[0] {
 	// unhandled: timestamp
 	case "namespace":
-		return string(e.Namespace), len(e.Namespace) > 0
+		return e.Namespace, len(e.Namespace) > 0
 	case "topic":
-		return string(e.Topic), len(e.Topic) > 0
+		return e.Topic, len(e.Topic) > 0
 	case "event":
 		decoded, err := typeurl.UnmarshalAny(e.Event)
 		if err != nil {
--- a/vendor/github.com/containerd/containerd/fs/diff.go
+++ b/vendor/github.com/containerd/containerd/fs/diff.go
@ -222,10 +222,8 @@ func doubleWalkDiff(ctx context.Context, changeFn ChangeFunc, a, b string) (err
 		c1 = make(chan *currentPath)
 		c2 = make(chan *currentPath)

-		f1, f2         *currentPath
-		rmdir          string
-		lastEmittedDir = string(filepath.Separator)
-		parents        []os.FileInfo
+		f1, f2 *currentPath
+		rmdir  string
 	)
 	g.Go(func() error {
 		defer close(c1)
@ -260,10 +258,7 @@ func doubleWalkDiff(ctx context.Context, changeFn ChangeFunc, a, b string) (err
 				continue
 			}

-			var (
-				f    os.FileInfo
-				emit = true
-			)
+			var f os.FileInfo
 			k, p := pathChange(f1, f2)
 			switch k {
 			case ChangeKindAdd:
@ -299,35 +294,13 @@ func doubleWalkDiff(ctx context.Context, changeFn ChangeFunc, a, b string) (err
 				f2 = nil
 				if same {
 					if !isLinked(f) {
-						emit = false
+						continue
 					}
 					k = ChangeKindUnmodified
 				}
 			}
-			if emit {
-				emittedDir, emitParents := commonParents(lastEmittedDir, p, parents)
-				for _, pf := range emitParents {
-					p := filepath.Join(emittedDir, pf.Name())
-					if err := changeFn(ChangeKindUnmodified, p, pf, nil); err != nil {
-						return err
-					}
-					emittedDir = p
-				}
-
-				if err := changeFn(k, p, f, nil); err != nil {
-					return err
-				}
-
-				if f != nil && f.IsDir() {
-					lastEmittedDir = p
-				} else {
-					lastEmittedDir = emittedDir
-				}
-
-				parents = parents[:0]
-			} else if f.IsDir() {
-				lastEmittedDir, parents = commonParents(lastEmittedDir, p, parents)
-				parents = append(parents, f)
+			if err := changeFn(k, p, f, nil); err != nil {
+				return err
 			}
 		}
 		return nil
@ -335,47 +308,3 @@ func doubleWalkDiff(ctx context.Context, changeFn ChangeFunc, a, b string) (err

 	return g.Wait()
 }
-
-func commonParents(base, updated string, dirs []os.FileInfo) (string, []os.FileInfo) {
-	if basePrefix := makePrefix(base); strings.HasPrefix(updated, basePrefix) {
-		var (
-			parents []os.FileInfo
-			last    = base
-		)
-		for _, d := range dirs {
-			next := filepath.Join(last, d.Name())
-			if strings.HasPrefix(updated, makePrefix(last)) {
-				parents = append(parents, d)
-				last = next
-			} else {
-				break
-			}
-		}
-		return base, parents
-	}
-
-	baseS := strings.Split(base, string(filepath.Separator))
-	updatedS := strings.Split(updated, string(filepath.Separator))
-	commonS := []string{string(filepath.Separator)}
-
-	min := len(baseS)
-	if len(updatedS) < min {
-		min = len(updatedS)
-	}
-	for i := 0; i < min; i++ {
-		if baseS[i] == updatedS[i] {
-			commonS = append(commonS, baseS[i])
-		} else {
-			break
-		}
-	}
-
-	return filepath.Join(commonS...), []os.FileInfo{}
-}
-
-func makePrefix(d string) string {
-	if d == "" || d[len(d)-1] != filepath.Separator {
-		return d + string(filepath.Separator)
-	}
-	return d
-}
--- a/vendor/github.com/containerd/containerd/fs/du_unix.go
+++ b/vendor/github.com/containerd/containerd/fs/du_unix.go
@ -15,6 +15,15 @@ type inode struct {
 	dev, ino uint64
 }

+func newInode(stat *syscall.Stat_t) inode {
+	return inode{
+		// Dev is uint32 on darwin/bsd, uint64 on linux/solaris
+		dev: uint64(stat.Dev), // nolint: unconvert
+		// Ino is uint32 on bsd, uint64 on darwin/linux/solaris
+		ino: uint64(stat.Ino), // nolint: unconvert
+	}
+}
+
 func diskUsage(roots ...string) (Usage, error) {

 	var (
@ -28,9 +37,7 @@ func diskUsage(roots ...string) (Usage, error) {
 				return err
 			}

-			stat := fi.Sys().(*syscall.Stat_t)
-
-			inoKey := inode{dev: uint64(stat.Dev), ino: uint64(stat.Ino)}
+			inoKey := newInode(fi.Sys().(*syscall.Stat_t))
 			if _, ok := inodes[inoKey]; !ok {
 				inodes[inoKey] = struct{}{}
 				size += fi.Size()
@ -60,9 +67,7 @@ func diffUsage(ctx context.Context, a, b string) (Usage, error) {
 		}

 		if kind == ChangeKindAdd || kind == ChangeKindModify {
-			stat := fi.Sys().(*syscall.Stat_t)
-
-			inoKey := inode{dev: uint64(stat.Dev), ino: uint64(stat.Ino)}
+			inoKey := newInode(fi.Sys().(*syscall.Stat_t))
 			if _, ok := inodes[inoKey]; !ok {
 				inodes[inoKey] = struct{}{}
 				size += fi.Size()
--- a/vendor/github.com/containerd/containerd/fs/hardlink_unix.go
+++ b/vendor/github.com/containerd/containerd/fs/hardlink_unix.go
@ -13,5 +13,6 @@ func getLinkInfo(fi os.FileInfo) (uint64, bool) {
 		return 0, false
 	}

-	return uint64(s.Ino), !fi.IsDir() && s.Nlink > 1
+	// Ino is uint32 on bsd, uint64 on darwin/linux/solaris
+	return uint64(s.Ino), !fi.IsDir() && s.Nlink > 1 // nolint: unconvert
 }
--- a/vendor/github.com/containerd/containerd/fs/path.go
+++ b/vendor/github.com/containerd/containerd/fs/path.go
@ -71,9 +71,9 @@ func sameFile(f1, f2 *currentPath) (bool, error) {
 			return false, nil
 		}

-		// If the timestamp may have been truncated in one of the
+		// If the timestamp may have been truncated in both of the
 		// files, check content of file to determine difference
-		if t1.Nanosecond() == 0 || t2.Nanosecond() == 0 {
+		if t1.Nanosecond() == 0 && t2.Nanosecond() == 0 {
 			var eq bool
 			if (f1.f.Mode() & os.ModeSymlink) == os.ModeSymlink {
 				eq, err = compareSymlinkTarget(f1.fullPath, f2.fullPath)
--- a/vendor/github.com/containerd/containerd/gc/gc.go
+++ b/vendor/github.com/containerd/containerd/gc/gc.go
@ -8,6 +8,7 @@ package gc
 import (
 	"context"
 	"sync"
+	"time"
 )

 // ResourceType represents type of resource at a node
@ -21,6 +22,11 @@ type Node struct {
 	Key       string
 }

+// Stats about a garbage collection run
+type Stats interface {
+	Elapsed() time.Duration
+}
+
 // Tricolor implements basic, single-thread tri-color GC. Given the roots, the
 // complete set and a refs function, this function returns a map of all
 // reachable objects.
--- a/vendor/github.com/containerd/containerd/images/image.go
+++ b/vendor/github.com/containerd/containerd/images/image.go
@ -357,13 +357,5 @@ func RootFS(ctx context.Context, provider content.Provider, configDesc ocispec.D
 	if err := json.Unmarshal(p, &config); err != nil {
 		return nil, err
 	}
-
-	// TODO(stevvooe): Remove this bit when OCI structure uses correct type for
-	// rootfs.DiffIDs.
-	var diffIDs []digest.Digest
-	for _, diffID := range config.RootFS.DiffIDs {
-		diffIDs = append(diffIDs, digest.Digest(diffID))
-	}
-
-	return diffIDs, nil
+	return config.RootFS.DiffIDs, nil
 }
--- a/vendor/github.com/containerd/containerd/metadata/content.go
+++ b/vendor/github.com/containerd/containerd/metadata/content.go
@ -318,12 +318,23 @@ func (cs *contentStore) Writer(ctx context.Context, ref string, size int64, expe
 	cs.l.RLock()
 	defer cs.l.RUnlock()

-	var w content.Writer
+	var (
+		w      content.Writer
+		exists bool
+	)
 	if err := update(ctx, cs.db, func(tx *bolt.Tx) error {
 		if expected != "" {
 			cbkt := getBlobBucket(tx, ns, expected)
 			if cbkt != nil {
-				return errors.Wrapf(errdefs.ErrAlreadyExists, "content %v", expected)
+				// Add content to lease to prevent other reference removals
+				// from effecting this object during a provided lease
+				if err := addContentLease(ctx, tx, expected); err != nil {
+					return errors.Wrap(err, "unable to lease content")
+				}
+				// Return error outside of transaction to ensure
+				// commit succeeds with the lease.
+				exists = true
+				return nil
 			}
 		}

@ -363,6 +374,9 @@ func (cs *contentStore) Writer(ctx context.Context, ref string, size int64, expe
 	}); err != nil {
 		return nil, err
 	}
+	if exists {
+		return nil, errors.Wrapf(errdefs.ErrAlreadyExists, "content %v", expected)
+	}

 	// TODO: keep the expected in the writer to use on commit
 	// when no expected is provided there.
--- a/vendor/github.com/containerd/containerd/metadata/db.go
+++ b/vendor/github.com/containerd/containerd/metadata/db.go
@ -204,7 +204,7 @@ func (m *DB) Update(fn func(*bolt.Tx) error) error {
 // RegisterMutationCallback registers a function to be called after a metadata
 // mutations has been performed.
 //
-// The callback function in an argument for whether a deletion has occurred
+// The callback function is an argument for whether a deletion has occurred
 // since the last garbage collection.
 func (m *DB) RegisterMutationCallback(fn func(bool)) {
 	m.dirtyL.Lock()
@ -219,15 +219,20 @@ type GCStats struct {
 	SnapshotD map[string]time.Duration
 }

+// Elapsed returns the duration which elapsed during a collection
+func (s GCStats) Elapsed() time.Duration {
+	return s.MetaD
+}
+
 // GarbageCollect starts garbage collection
-func (m *DB) GarbageCollect(ctx context.Context) (stats GCStats, err error) {
+func (m *DB) GarbageCollect(ctx context.Context) (gc.Stats, error) {
 	m.wlock.Lock()
 	t1 := time.Now()

 	marked, err := m.getMarked(ctx)
 	if err != nil {
 		m.wlock.Unlock()
-		return GCStats{}, err
+		return nil, err
 	}

 	m.dirtyL.Lock()
@ -259,9 +264,10 @@ func (m *DB) GarbageCollect(ctx context.Context) (stats GCStats, err error) {
 	}); err != nil {
 		m.dirtyL.Unlock()
 		m.wlock.Unlock()
-		return GCStats{}, err
+		return nil, err
 	}

+	var stats GCStats
 	var wg sync.WaitGroup

 	if len(m.dirtySS) > 0 {
@ -303,7 +309,7 @@ func (m *DB) GarbageCollect(ctx context.Context) (stats GCStats, err error) {

 	wg.Wait()

-	return
+	return stats, err
 }

 func (m *DB) getMarked(ctx context.Context) (map[gc.Node]struct{}, error) {
--- a/vendor/github.com/containerd/containerd/metadata/images.go
+++ b/vendor/github.com/containerd/containerd/metadata/images.go
@ -275,7 +275,7 @@ func writeImage(bkt *bolt.Bucket, image *images.Image) error {
 	}

 	// write the target bucket
-	tbkt, err := bkt.CreateBucketIfNotExists([]byte(bucketKeyTarget))
+	tbkt, err := bkt.CreateBucketIfNotExists(bucketKeyTarget)
 	if err != nil {
 		return err
 	}
--- a/vendor/github.com/containerd/containerd/mount/mount.go
+++ b/vendor/github.com/containerd/containerd/mount/mount.go
@ -1,5 +1,14 @@
 package mount

+import (
+	"context"
+	"io/ioutil"
+	"os"
+
+	"github.com/containerd/containerd/log"
+	"github.com/pkg/errors"
+)
+
 // Mount is the lingua franca of containerd. A mount represents a
 // serialized mount syscall. Components either emit or consume mounts.
 type Mount struct {
@ -22,3 +31,42 @@ func All(mounts []Mount, target string) error {
 	}
 	return nil
 }
+
+// WithTempMount mounts the provided mounts to a temp dir, and pass the temp dir to f.
+// The mounts are valid during the call to the f.
+// Finally we will unmount and remove the temp dir regardless of the result of f.
+func WithTempMount(ctx context.Context, mounts []Mount, f func(root string) error) (err error) {
+	root, uerr := ioutil.TempDir("", "containerd-WithTempMount")
+	if uerr != nil {
+		return errors.Wrapf(uerr, "failed to create temp dir")
+	}
+	// We use Remove here instead of RemoveAll.
+	// The RemoveAll will delete the temp dir and all children it contains.
+	// When the Unmount fails, RemoveAll will incorrectly delete data from
+	// the mounted dir. However, if we use Remove, even though we won't
+	// successfully delete the temp dir and it may leak, we won't loss data
+	// from the mounted dir.
+	// For details, please refer to #1868 #1785.
+	defer func() {
+		if uerr = os.Remove(root); uerr != nil {
+			log.G(ctx).WithError(uerr).WithField("dir", root).Errorf("failed to remove mount temp dir")
+		}
+	}()
+
+	// We should do defer first, if not we will not do Unmount when only a part of Mounts are failed.
+	defer func() {
+		if uerr = UnmountAll(root, 0); uerr != nil {
+			uerr = errors.Wrapf(uerr, "failed to unmount %s", root)
+			if err == nil {
+				err = uerr
+			} else {
+				err = errors.Wrap(err, uerr.Error())
+			}
+		}
+	}()
+	if uerr = All(mounts, root); uerr != nil {
+		return errors.Wrapf(uerr, "failed to mount %s", root)
+	}
+
+	return errors.Wrapf(f(root), "mount callback failed on %s", root)
+}
--- a/vendor/github.com/containerd/containerd/oci/spec_opts_unix.go
+++ b/vendor/github.com/containerd/containerd/oci/spec_opts_unix.go
@ -6,7 +6,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strconv"
@ -271,49 +270,35 @@ func WithUserID(uid uint32) SpecOpts {
 		if err != nil {
 			return err
 		}
-		root, err := ioutil.TempDir("", "ctd-username")
-		if err != nil {
-			return err
-		}
-		defer os.Remove(root)
-		for _, m := range mounts {
-			if err := m.Mount(root); err != nil {
+
+		return mount.WithTempMount(ctx, mounts, func(root string) error {
+			ppath, err := fs.RootPath(root, "/etc/passwd")
+			if err != nil {
 				return err
 			}
-		}
-		defer func() {
-			if uerr := mount.Unmount(root, 0); uerr != nil {
-				if err == nil {
-					err = uerr
+			f, err := os.Open(ppath)
+			if err != nil {
+				if os.IsNotExist(err) {
+					s.Process.User.UID, s.Process.User.GID = uid, uid
+					return nil
 				}
+				return err
 			}
-		}()
-		ppath, err := fs.RootPath(root, "/etc/passwd")
-		if err != nil {
-			return err
-		}
-		f, err := os.Open(ppath)
-		if err != nil {
-			if os.IsNotExist(err) {
+			defer f.Close()
+			users, err := user.ParsePasswdFilter(f, func(u user.User) bool {
+				return u.Uid == int(uid)
+			})
+			if err != nil {
+				return err
+			}
+			if len(users) == 0 {
 				s.Process.User.UID, s.Process.User.GID = uid, uid
 				return nil
 			}
-			return err
-		}
-		defer f.Close()
-		users, err := user.ParsePasswdFilter(f, func(u user.User) bool {
-			return u.Uid == int(uid)
-		})
-		if err != nil {
-			return err
-		}
-		if len(users) == 0 {
-			s.Process.User.UID, s.Process.User.GID = uid, uid
+			u := users[0]
+			s.Process.User.UID, s.Process.User.GID = uint32(u.Uid), uint32(u.Gid)
 			return nil
-		}
-		u := users[0]
-		s.Process.User.UID, s.Process.User.GID = uint32(u.Uid), uint32(u.Gid)
-		return nil
+		})
 	}
 }

@ -334,43 +319,28 @@ func WithUsername(username string) SpecOpts {
 		if err != nil {
 			return err
 		}
-		root, err := ioutil.TempDir("", "ctd-username")
-		if err != nil {
-			return err
-		}
-		defer os.Remove(root)
-		for _, m := range mounts {
-			if err := m.Mount(root); err != nil {
+		return mount.WithTempMount(ctx, mounts, func(root string) error {
+			ppath, err := fs.RootPath(root, "/etc/passwd")
+			if err != nil {
 				return err
 			}
-		}
-		defer func() {
-			if uerr := mount.Unmount(root, 0); uerr != nil {
-				if err == nil {
-					err = uerr
-				}
+			f, err := os.Open(ppath)
+			if err != nil {
+				return err
 			}
-		}()
-		ppath, err := fs.RootPath(root, "/etc/passwd")
-		if err != nil {
-			return err
-		}
-		f, err := os.Open(ppath)
-		if err != nil {
-			return err
-		}
-		defer f.Close()
-		users, err := user.ParsePasswdFilter(f, func(u user.User) bool {
-			return u.Name == username
+			defer f.Close()
+			users, err := user.ParsePasswdFilter(f, func(u user.User) bool {
+				return u.Name == username
+			})
+			if err != nil {
+				return err
+			}
+			if len(users) == 0 {
+				return errors.Errorf("no users found for %s", username)
+			}
+			u := users[0]
+			s.Process.User.UID, s.Process.User.GID = uint32(u.Uid), uint32(u.Gid)
+			return nil
 		})
-		if err != nil {
-			return err
-		}
-		if len(users) == 0 {
-			return errors.Errorf("no users found for %s", username)
-		}
-		u := users[0]
-		s.Process.User.UID, s.Process.User.GID = uint32(u.Uid), uint32(u.Gid)
-		return nil
 	}
 }
--- a/vendor/github.com/containerd/containerd/platforms/cpuinfo.go
+++ b/vendor/github.com/containerd/containerd/platforms/cpuinfo.go
@ -0,0 +1,85 @@
+package platforms
+
+import (
+	"bufio"
+	"os"
+	"runtime"
+	"strings"
+
+	"github.com/containerd/containerd/errdefs"
+	"github.com/containerd/containerd/log"
+	"github.com/pkg/errors"
+)
+
+// Present the ARM instruction set architecture, eg: v7, v8
+var cpuVariant string
+
+func init() {
+	if isArmArch(runtime.GOARCH) {
+		cpuVariant = getCPUVariant()
+	} else {
+		cpuVariant = ""
+	}
+}
+
+// For Linux, the kernel has already detected the ABI, ISA and Features.
+// So we don't need to access the ARM registers to detect platform information
+// by ourselves. We can just parse these information from /proc/cpuinfo
+func getCPUInfo(pattern string) (info string, err error) {
+	if !isLinuxOS(runtime.GOOS) {
+		return "", errors.Wrapf(errdefs.ErrNotImplemented, "getCPUInfo for OS %s", runtime.GOOS)
+	}
+
+	cpuinfo, err := os.Open("/proc/cpuinfo")
+	if err != nil {
+		return "", err
+	}
+	defer cpuinfo.Close()
+
+	// Start to Parse the Cpuinfo line by line. For SMP SoC, we parse
+	// the first core is enough.
+	scanner := bufio.NewScanner(cpuinfo)
+	for scanner.Scan() {
+		newline := scanner.Text()
+		list := strings.Split(newline, ":")
+
+		if len(list) > 1 && strings.EqualFold(strings.TrimSpace(list[0]), pattern) {
+			return strings.TrimSpace(list[1]), nil
+		}
+	}
+
+	// Check whether the scanner encountered errors
+	err = scanner.Err()
+	if err != nil {
+		return "", err
+	}
+
+	return "", errors.Wrapf(errdefs.ErrNotFound, "getCPUInfo for pattern: %s", pattern)
+}
+
+func getCPUVariant() string {
+	variant, err := getCPUInfo("Cpu architecture")
+	if err != nil {
+		log.L.WithError(err).Error("failure getting variant")
+		return ""
+	}
+
+	switch variant {
+	case "8":
+		variant = "v8"
+	case "7", "7M", "?(12)", "?(13)", "?(14)", "?(15)", "?(16)", "?(17)":
+		variant = "v7"
+	case "6", "6TEJ":
+		variant = "v6"
+	case "5", "5T", "5TE", "5TEJ":
+		variant = "v5"
+	case "4", "4T":
+		variant = "v4"
+	case "3":
+		variant = "v3"
+	default:
+		variant = "unknown"
+	}
+
+	return variant
+}
--- a/vendor/github.com/containerd/containerd/platforms/database.go
+++ b/vendor/github.com/containerd/containerd/platforms/database.go
@ -5,6 +5,13 @@ import (
 	"strings"
 )

+// isLinuxOS returns true if the operating system is Linux.
+//
+// The OS value should be normalized before calling this function.
+func isLinuxOS(os string) bool {
+	return os == "linux"
+}
+
 // These function are generated from from https://golang.org/src/go/build/syslist.go.
 //
 // We use switch statements because they are slightly faster than map lookups
@ -21,6 +28,17 @@ func isKnownOS(os string) bool {
 	return false
 }

+// isArmArch returns true if the architecture is ARM.
+//
+// The arch value should be normalized before being passed to this function.
+func isArmArch(arch string) bool {
+	switch arch {
+	case "arm", "arm64":
+		return true
+	}
+	return false
+}
+
 // isKnownArch returns true if we know about the architecture.
 //
 // The arch value should be normalized before being passed to this function.
--- a/vendor/github.com/containerd/containerd/platforms/defaults.go
+++ b/vendor/github.com/containerd/containerd/platforms/defaults.go
@ -16,6 +16,7 @@ func DefaultSpec() specs.Platform {
 	return specs.Platform{
 		OS:           runtime.GOOS,
 		Architecture: runtime.GOARCH,
-		// TODO(stevvooe): Need to resolve GOARM for arm hosts.
+		// The Variant field will be empty if arch != ARM.
+		Variant: cpuVariant,
 	}
 }
--- a/vendor/github.com/containerd/containerd/process.go
+++ b/vendor/github.com/containerd/containerd/process.go
@ -191,6 +191,7 @@ func (p *process) Delete(ctx context.Context, opts ...ProcessDeleteOpts) (*ExitS
 		return nil, errdefs.FromGRPC(err)
 	}
 	if p.io != nil {
+		p.io.Cancel()
 		p.io.Wait()
 		p.io.Close()
 	}
--- a/vendor/github.com/containerd/containerd/remotes/hints.go
+++ b/vendor/github.com/containerd/containerd/remotes/hints.go
@ -1,31 +0,0 @@
-package remotes
-
-import "strings"
-
-// HintExists returns true if a hint of the provided kind and values exists in
-// the set of provided hints.
-func HintExists(kind, value string, hints ...string) bool {
-	for _, hint := range hints {
-		if strings.HasPrefix(hint, kind) && strings.HasSuffix(hint, value) {
-			return true
-		}
-	}
-
-	return false
-}
-
-// HintValues returns a slice of the values of the hints that match kind.
-func HintValues(kind string, hints ...string) []string {
-	var values []string
-	for _, hint := range hints {
-		if strings.HasPrefix(hint, kind) {
-			parts := strings.SplitN(hint, ":", 2)
-			if len(parts) < 2 {
-				continue
-			}
-			values = append(values, parts[1])
-		}
-	}
-
-	return values
-}
--- a/vendor/github.com/containerd/containerd/rootfs/diff.go
+++ b/vendor/github.com/containerd/containerd/rootfs/diff.go
@ -39,7 +39,7 @@ func Diff(ctx context.Context, snapshotID string, sn snapshots.Snapshotter, d di
 		if err != nil {
 			return ocispec.Descriptor{}, err
 		}
-		defer sn.Remove(ctx, lowerKey)
+		defer sn.Remove(ctx, upperKey)
 	}

 	return d.DiffMounts(ctx, lower, upper, opts...)
--- a/vendor/github.com/containerd/containerd/sys/stat_bsd.go
+++ b/vendor/github.com/containerd/containerd/sys/stat_bsd.go
@ -4,6 +4,7 @@ package sys

 import (
 	"syscall"
+	"time"
 )

 // StatAtime returns the access time from a stat struct
@ -20,3 +21,8 @@ func StatCtime(st *syscall.Stat_t) syscall.Timespec {
 func StatMtime(st *syscall.Stat_t) syscall.Timespec {
 	return st.Mtimespec
 }
+
+// StatATimeAsTime returns the access time as a time.Time
+func StatATimeAsTime(st *syscall.Stat_t) time.Time {
+	return time.Unix(int64(st.Atimespec.Sec), int64(st.Atimespec.Nsec)) // nolint: unconvert
+}
--- a/vendor/github.com/containerd/containerd/sys/stat_unix.go
+++ b/vendor/github.com/containerd/containerd/sys/stat_unix.go
@ -4,6 +4,7 @@ package sys

 import (
 	"syscall"
+	"time"
 )

 // StatAtime returns the Atim
@ -20,3 +21,8 @@ func StatCtime(st *syscall.Stat_t) syscall.Timespec {
 func StatMtime(st *syscall.Stat_t) syscall.Timespec {
 	return st.Mtim
 }
+
+// StatATimeAsTime returns st.Atim as a time.Time
+func StatATimeAsTime(st *syscall.Stat_t) time.Time {
+	return time.Unix(st.Atim.Sec, st.Atim.Nsec)
+}
--- a/vendor/github.com/containerd/containerd/task.go
+++ b/vendor/github.com/containerd/containerd/task.go
@ -123,7 +123,7 @@ type Task interface {
 	// Resume the execution of the task
 	Resume(context.Context) error
 	// Exec creates a new process inside the task
-	Exec(context.Context, string, *specs.Process, cio.Creation) (Process, error)
+	Exec(context.Context, string, *specs.Process, cio.Creator) (Process, error)
 	// Pids returns a list of system specific process ids inside the task
 	Pids(context.Context) ([]ProcessInfo, error)
 	// Checkpoint serializes the runtime and memory information of a task into an
@ -163,6 +163,7 @@ func (t *task) Start(ctx context.Context) error {
 		ContainerID: t.id,
 	})
 	if err != nil {
+		t.io.Cancel()
 		t.io.Close()
 		return errdefs.FromGRPC(err)
 	}
@ -277,7 +278,7 @@ func (t *task) Delete(ctx context.Context, opts ...ProcessDeleteOpts) (*ExitStat
 	return &ExitStatus{code: r.ExitStatus, exitedAt: r.ExitedAt}, nil
 }

-func (t *task) Exec(ctx context.Context, id string, spec *specs.Process, ioCreate cio.Creation) (_ Process, err error) {
+func (t *task) Exec(ctx context.Context, id string, spec *specs.Process, ioCreate cio.Creator) (_ Process, err error) {
 	if id == "" {
 		return nil, errors.Wrapf(errdefs.ErrInvalidArgument, "exec id must not be empty")
 	}
--- a/vendor/github.com/containerd/containerd/vendor.conf
+++ b/vendor/github.com/containerd/containerd/vendor.conf
@ -15,8 +15,8 @@ github.com/matttproud/golang_protobuf_extensions v1.0.0
 github.com/docker/go-units v0.3.1
 github.com/gogo/protobuf v0.5
 github.com/golang/protobuf 1643683e1b54a9e88ad26d98f81400c8c9d9f4f9
-github.com/opencontainers/runtime-spec v1.0.0
-github.com/opencontainers/runc 74a17296470088de3805e138d3d87c62e613dfc4
+github.com/opencontainers/runtime-spec v1.0.1
+github.com/opencontainers/runc 7f24b40cc5423969b4554ef04ba0b00e2b4ba010
 github.com/sirupsen/logrus v1.0.0
 github.com/containerd/btrfs cc52c4dea2ce11a44e6639e561bb5c2af9ada9e3
 github.com/stretchr/testify v1.1.4
@ -25,20 +25,19 @@ github.com/pmezard/go-difflib v1.0.0
 github.com/containerd/fifo fbfb6a11ec671efbe94ad1c12c2e98773f19e1e6
 github.com/urfave/cli 7bc6a0acffa589f415f88aca16cc1de5ffd66f9c
 golang.org/x/net 7dcfb8076726a3fdd9353b6b8a1f1b6be6811bd6
-google.golang.org/grpc v1.7.2
+google.golang.org/grpc v1.7.4
 github.com/pkg/errors v0.8.0
 github.com/opencontainers/go-digest 21dfd564fd89c944783d00d069f33e3e7123c448
 golang.org/x/sys 314a259e304ff91bd6985da2a7149bbf91237993 https://github.com/golang/sys
-github.com/opencontainers/image-spec v1.0.0
+github.com/opencontainers/image-spec v1.0.1
 github.com/containerd/continuity cf279e6ac893682272b4479d4c67fd3abf878b4e
 golang.org/x/sync 450f422ab23cf9881c94e2db30cac0eb1b7cf80c
 github.com/BurntSushi/toml v0.2.0-21-g9906417
 github.com/grpc-ecosystem/go-grpc-prometheus 6b7015e65d366bf3f19b2b2a000a831940f0f7e0
-github.com/Microsoft/go-winio v0.4.4
+github.com/Microsoft/go-winio v0.4.5
 github.com/Microsoft/hcsshim v0.6.7
-github.com/Microsoft/opengcs v0.3.2
 github.com/boltdb/bolt e9cf4fae01b5a8ff89d0ec6b32f0d9c9f79aefdd
 google.golang.org/genproto d80a6e20e776b0b17a324d0ba1ab50a39c8e8944
 golang.org/x/text 19e51611da83d6be54ddafce4a4af510cb3e9ea4
 github.com/dmcgowan/go-tar go1.10
-github.com/stevvooe/ttrpc 76e68349ad9ab4d03d764c713826d31216715e4f
+github.com/stevvooe/ttrpc d2710463e497617f16f26d1e715a3308609e7982
--- a/vendor/github.com/opencontainers/image-spec/README.md
+++ b/vendor/github.com/opencontainers/image-spec/README.md
@ -51,7 +51,7 @@ Find more [FAQ on the OCI site](https://www.opencontainers.org/faq).

 ## Roadmap

-The [GitHub milestones](https://github.com/opencontainers/image-spec/milestones) lay out the path to the OCI v1.0.0 release in late 2016.
+The [GitHub milestones](https://github.com/opencontainers/image-spec/milestones) lay out the path to the future improvements.

 # Contributing

--- a/vendor/github.com/opencontainers/image-spec/specs-go/version.go
+++ b/vendor/github.com/opencontainers/image-spec/specs-go/version.go
@ -22,7 +22,7 @@ const (
 	// VersionMinor is for functionality in a backwards-compatible manner
 	VersionMinor = 0
 	// VersionPatch is for backwards-compatible bug fixes
-	VersionPatch = 0
+	VersionPatch = 1

 	// VersionDev indicates development branch. Releases will be empty string.
 	VersionDev = ""
--- a/vendor/github.com/opencontainers/runc/README.md
+++ b/vendor/github.com/opencontainers/runc/README.md
@ -56,7 +56,7 @@ make BUILDTAGS='seccomp apparmor'
 |-----------|------------------------------------|-------------|
 | seccomp   | Syscall filtering                  | libseccomp  |
 | selinux   | selinux process and mount labeling | <none>      |
-| apparmor  | apparmor profile support           | libapparmor |
+| apparmor  | apparmor profile support           | <none>      |
 | ambient   | ambient capability support         | kernel 4.3  |


--- a/vendor/github.com/opencontainers/runc/libcontainer/system/sysconfig.go
+++ b/vendor/github.com/opencontainers/runc/libcontainer/system/sysconfig.go
@ -1,4 +1,4 @@
-// +build cgo,linux cgo,freebsd
+// +build cgo,linux

 package system

--- a/vendor/github.com/opencontainers/runc/libcontainer/user/lookup_unsupported.go
+++ b/vendor/github.com/opencontainers/runc/libcontainer/user/lookup_unsupported.go
@ -1,38 +0,0 @@
-// +build !darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris
-
-package user
-
-import (
-	"io"
-	"syscall"
-)
-
-func GetPasswdPath() (string, error) {
-	return "", ErrUnsupported
-}
-
-func GetPasswd() (io.ReadCloser, error) {
-	return nil, ErrUnsupported
-}
-
-func GetGroupPath() (string, error) {
-	return "", ErrUnsupported
-}
-
-func GetGroup() (io.ReadCloser, error) {
-	return nil, ErrUnsupported
-}
-
-// CurrentUser looks up the current user by their user id in /etc/passwd. If the
-// user cannot be found (or there is no /etc/passwd file on the filesystem),
-// then CurrentUser returns an error.
-func CurrentUser() (User, error) {
-	return LookupUid(syscall.Getuid())
-}
-
-// CurrentGroup looks up the current user's group by their primary group id's
-// entry in /etc/passwd. If the group cannot be found (or there is no
-// /etc/group file on the filesystem), then CurrentGroup returns an error.
-func CurrentGroup() (Group, error) {
-	return LookupGid(syscall.Getgid())
-}
--- a/vendor/github.com/opencontainers/runc/vendor.conf
+++ b/vendor/github.com/opencontainers/runc/vendor.conf
@ -15,7 +15,7 @@ github.com/coreos/pkg v3
 github.com/godbus/dbus v3
 github.com/golang/protobuf 18c9bb3261723cd5401db4d0c9fbc5c3b6c70fe8
 # Command-line interface.
-github.com/docker/docker 0f5c9d301b9b1cca66b3ea0f9dec3b5317d3686d
+github.com/cyphar/filepath-securejoin v0.2.1
 github.com/docker/go-units v0.2.0
 github.com/urfave/cli d53eb991652b1d438abdd34ce4bfa3ef1539108e
 golang.org/x/sys 7ddbeae9ae08c6a06a59597f0c9edbc5ff2444ce https://github.com/golang/sys
--- a/vendor/github.com/opencontainers/runtime-spec/README.md
+++ b/vendor/github.com/opencontainers/runtime-spec/README.md
@ -52,17 +52,12 @@ It also guarantees that the design is sound before code is written; a GitHub pul
 Typos and grammatical errors can go straight to a pull-request.
 When in doubt, start on the [mailing-list](#mailing-list).

-### Weekly Call
-
-The contributors and maintainers of all OCI projects have a weekly meeting on Wednesdays at:
-
-* 8:00 AM (USA Pacific), during [odd weeks][iso-week].
-* 2:00 PM (USA Pacific), during [even weeks][iso-week].
+### Meetings

+The contributors and maintainers of all OCI projects have monthly meetings at 2:00 PM (USA Pacific) on the first Wednesday of every month.
 There is an [iCalendar][rfc5545] format for the meetings [here](meeting.ics).
-
 Everyone is welcome to participate via [UberConference web][uberconference] or audio-only: +1 415 968 0849 (no PIN needed).
-An initial agenda will be posted to the [mailing list](#mailing-list) earlier in the week, and everyone is welcome to propose additional topics or suggest other agenda alterations there.
+An initial agenda will be posted to the [mailing list](#mailing-list) in the week before each meeting, and everyone is welcome to propose additional topics or suggest other agenda alterations there.
 Minutes are posted to the [mailing list](#mailing-list) and minutes from past calls are archived [here][minutes], with minutes from especially old meetings (September 2015 and earlier) archived [here][runtime-wiki].

 ### Mailing List
--- a/vendor/github.com/opencontainers/runtime-spec/specs-go/config.go
+++ b/vendor/github.com/opencontainers/runtime-spec/specs-go/config.go
@ -4,7 +4,7 @@ import "os"

 // Spec is the base configuration for the container.
 type Spec struct {
-	// Version of the Open Container Runtime Specification with which the bundle complies.
+	// Version of the Open Container Initiative Runtime Specification with which the bundle complies.
 	Version string `json:"ociVersion"`
 	// Process configures the container process.
 	Process *Process `json:"process,omitempty"`
--- a/vendor/github.com/opencontainers/runtime-spec/specs-go/version.go
+++ b/vendor/github.com/opencontainers/runtime-spec/specs-go/version.go
@ -8,7 +8,7 @@ const (
 	// VersionMinor is for functionality in a backwards-compatible manner
 	VersionMinor = 0
 	// VersionPatch is for backwards-compatible bug fixes
-	VersionPatch = 0
+	VersionPatch = 1

 	// VersionDev indicates development branch. Releases will be empty string.
 	VersionDev = ""
--- a/vendor/google.golang.org/grpc/balancer_conn_wrappers.go
+++ b/vendor/google.golang.org/grpc/balancer_conn_wrappers.go
@ -171,7 +171,9 @@ func (ccb *ccBalancerWrapper) NewSubConn(addrs []resolver.Address, opts balancer
 		return nil, err
 	}
 	acbw := &acBalancerWrapper{ac: ac}
+	ac.mu.Lock()
 	ac.acbw = acbw
+	ac.mu.Unlock()
 	return acbw, nil
 }

@ -228,7 +230,9 @@ func (acbw *acBalancerWrapper) UpdateAddresses(addrs []resolver.Address) {
 			return
 		}
 		acbw.ac = ac
+		ac.mu.Lock()
 		ac.acbw = acbw
+		ac.mu.Unlock()
 		if acState != connectivity.Idle {
 			ac.connect(false)
 		}
--- a/vendor/google.golang.org/grpc/clientconn.go
+++ b/vendor/google.golang.org/grpc/clientconn.go
@ -929,6 +929,16 @@ func (ac *addrConn) resetTransport() error {
 			newTransport, err := transport.NewClientTransport(ac.cc.ctx, sinfo, copts, timeout)
 			if err != nil {
 				if e, ok := err.(transport.ConnectionError); ok && !e.Temporary() {
+					ac.mu.Lock()
+					if ac.state != connectivity.Shutdown {
+						ac.state = connectivity.TransientFailure
+						if ac.cc.balancerWrapper != nil {
+							ac.cc.balancerWrapper.handleSubConnStateChange(ac.acbw, ac.state)
+						} else {
+							ac.cc.csMgr.updateState(ac.state)
+						}
+					}
+					ac.mu.Unlock()
 					return err
 				}
 				grpclog.Warningf("grpc: addrConn.resetTransport failed to create client transport: %v; Reconnecting to %v", err, addr)
--- a/vendor/google.golang.org/grpc/credentials/credentials.go
+++ b/vendor/google.golang.org/grpc/credentials/credentials.go
@ -91,10 +91,14 @@ type TransportCredentials interface {
 	// (io.EOF, context.DeadlineExceeded or err.Temporary() == true).
 	// If the returned error is a wrapper error, implementations should make sure that
 	// the error implements Temporary() to have the correct retry behaviors.
+	//
+	// If the returned net.Conn is closed, it MUST close the net.Conn provided.
 	ClientHandshake(context.Context, string, net.Conn) (net.Conn, AuthInfo, error)
 	// ServerHandshake does the authentication handshake for servers. It returns
 	// the authenticated connection and the corresponding auth information about
 	// the connection.
+	//
+	// If the returned net.Conn is closed, it MUST close the net.Conn provided.
 	ServerHandshake(net.Conn) (net.Conn, AuthInfo, error)
 	// Info provides the ProtocolInfo of this TransportCredentials.
 	Info() ProtocolInfo
--- a/vendor/google.golang.org/grpc/rpc_util.go
+++ b/vendor/google.golang.org/grpc/rpc_util.go
@ -567,6 +567,6 @@ const SupportPackageIsVersion3 = true
 const SupportPackageIsVersion4 = true

 // Version is the current grpc version.
-const Version = "1.7.2"
+const Version = "1.7.4"

 const grpcUA = "grpc-go/" + Version
--- a/vendor/google.golang.org/grpc/server.go
+++ b/vendor/google.golang.org/grpc/server.go
@ -118,11 +118,13 @@ type options struct {
 	initialConnWindowSize int32
 	writeBufferSize       int
 	readBufferSize        int
+	connectionTimeout     time.Duration
 }

 var defaultServerOptions = options{
 	maxReceiveMessageSize: defaultServerMaxReceiveMessageSize,
 	maxSendMessageSize:    defaultServerMaxSendMessageSize,
+	connectionTimeout:     120 * time.Second,
 }

 // A ServerOption sets options such as credentials, codec and keepalive parameters, etc.
@ -291,6 +293,16 @@ func UnknownServiceHandler(streamHandler StreamHandler) ServerOption {
 	}
 }

+// ConnectionTimeout returns a ServerOption that sets the timeout for
+// connection establishment (up to and including HTTP/2 handshaking) for all
+// new connections.  If this is not set, the default is 120 seconds.  A zero or
+// negative value will result in an immediate timeout.
+func ConnectionTimeout(d time.Duration) ServerOption {
+	return func(o *options) {
+		o.connectionTimeout = d
+	}
+}
+
 // NewServer creates a gRPC server which has no service registered and has not
 // started to accept requests yet.
 func NewServer(opt ...ServerOption) *Server {
@ -499,16 +511,18 @@ func (s *Server) Serve(lis net.Listener) error {
 // handleRawConn is run in its own goroutine and handles a just-accepted
 // connection that has not had any I/O performed on it yet.
 func (s *Server) handleRawConn(rawConn net.Conn) {
+	rawConn.SetDeadline(time.Now().Add(s.opts.connectionTimeout))
 	conn, authInfo, err := s.useTransportAuthenticator(rawConn)
 	if err != nil {
 		s.mu.Lock()
 		s.errorf("ServerHandshake(%q) failed: %v", rawConn.RemoteAddr(), err)
 		s.mu.Unlock()
 		grpclog.Warningf("grpc: Server.Serve failed to complete security handshake from %q: %v", rawConn.RemoteAddr(), err)
-		// If serverHandShake returns ErrConnDispatched, keep rawConn open.
+		// If serverHandshake returns ErrConnDispatched, keep rawConn open.
 		if err != credentials.ErrConnDispatched {
 			rawConn.Close()
 		}
+		rawConn.SetDeadline(time.Time{})
 		return
 	}

@ -521,18 +535,21 @@ func (s *Server) handleRawConn(rawConn net.Conn) {
 	s.mu.Unlock()

 	if s.opts.useHandlerImpl {
+		rawConn.SetDeadline(time.Time{})
 		s.serveUsingHandler(conn)
 	} else {
-		s.serveHTTP2Transport(conn, authInfo)
+		st := s.newHTTP2Transport(conn, authInfo)
+		if st == nil {
+			return
+		}
+		rawConn.SetDeadline(time.Time{})
+		s.serveStreams(st)
 	}
 }

-// serveHTTP2Transport sets up a http/2 transport (using the
-// gRPC http2 server transport in transport/http2_server.go) and
-// serves streams on it.
-// This is run in its own goroutine (it does network I/O in
-// transport.NewServerTransport).
-func (s *Server) serveHTTP2Transport(c net.Conn, authInfo credentials.AuthInfo) {
+// newHTTP2Transport sets up a http/2 transport (using the
+// gRPC http2 server transport in transport/http2_server.go).
+func (s *Server) newHTTP2Transport(c net.Conn, authInfo credentials.AuthInfo) transport.ServerTransport {
 	config := &transport.ServerConfig{
 		MaxStreams:            s.opts.maxConcurrentStreams,
 		AuthInfo:              authInfo,
@ -552,13 +569,13 @@ func (s *Server) serveHTTP2Transport(c net.Conn, authInfo credentials.AuthInfo)
 		s.mu.Unlock()
 		c.Close()
 		grpclog.Warningln("grpc: Server.Serve failed to create ServerTransport: ", err)
-		return
+		return nil
 	}
 	if !s.addConn(st) {
 		st.Close()
-		return
+		return nil
 	}
-	s.serveStreams(st)
+	return st
 }

 func (s *Server) serveStreams(st transport.ServerTransport) {
--- a/vendor/google.golang.org/grpc/transport/handler_server.go
+++ b/vendor/google.golang.org/grpc/transport/handler_server.go
@ -123,10 +123,9 @@ type serverHandlerTransport struct {
 	// when WriteStatus is called.
 	writes chan func()

-	mu sync.Mutex
-	// streamDone indicates whether WriteStatus has been called and writes channel
-	// has been closed.
-	streamDone bool
+	// block concurrent WriteStatus calls
+	// e.g. grpc/(*serverStream).SendMsg/RecvMsg
+	writeStatusMu sync.Mutex
 }

 func (ht *serverHandlerTransport) Close() error {
@ -177,13 +176,9 @@ func (ht *serverHandlerTransport) do(fn func()) error {
 }

 func (ht *serverHandlerTransport) WriteStatus(s *Stream, st *status.Status) error {
-	ht.mu.Lock()
-	if ht.streamDone {
-		ht.mu.Unlock()
-		return nil
-	}
-	ht.streamDone = true
-	ht.mu.Unlock()
+	ht.writeStatusMu.Lock()
+	defer ht.writeStatusMu.Unlock()
+
 	err := ht.do(func() {
 		ht.writeCommonHeaders(s)

@ -222,7 +217,11 @@ func (ht *serverHandlerTransport) WriteStatus(s *Stream, st *status.Status) erro
 			}
 		}
 	})
-	close(ht.writes)
+
+	if err == nil { // transport has not been closed
+		ht.Close()
+		close(ht.writes)
+	}
 	return err
 }

--- a/vendor/google.golang.org/grpc/transport/http2_server.go
+++ b/vendor/google.golang.org/grpc/transport/http2_server.go
@ -152,12 +152,12 @@ func newHTTP2Server(conn net.Conn, config *ServerConfig) (_ ServerTransport, err
 			Val: uint32(iwz)})
 	}
 	if err := framer.fr.WriteSettings(isettings...); err != nil {
-		return nil, connectionErrorf(true, err, "transport: %v", err)
+		return nil, connectionErrorf(false, err, "transport: %v", err)
 	}
 	// Adjust the connection flow control window if needed.
 	if delta := uint32(icwz - defaultWindowSize); delta > 0 {
 		if err := framer.fr.WriteWindowUpdate(0, delta); err != nil {
-			return nil, connectionErrorf(true, err, "transport: %v", err)
+			return nil, connectionErrorf(false, err, "transport: %v", err)
 		}
 	}
 	kp := config.KeepaliveParams
@ -223,6 +223,31 @@ func newHTTP2Server(conn net.Conn, config *ServerConfig) (_ ServerTransport, err
 		t.stats.HandleConn(t.ctx, connBegin)
 	}
 	t.framer.writer.Flush()
+
+	// Check the validity of client preface.
+	preface := make([]byte, len(clientPreface))
+	if _, err := io.ReadFull(t.conn, preface); err != nil {
+		return nil, connectionErrorf(false, err, "transport: http2Server.HandleStreams failed to receive the preface from client: %v", err)
+	}
+	if !bytes.Equal(preface, clientPreface) {
+		return nil, connectionErrorf(false, nil, "transport: http2Server.HandleStreams received bogus greeting from client: %q", preface)
+	}
+
+	frame, err := t.framer.fr.ReadFrame()
+	if err == io.EOF || err == io.ErrUnexpectedEOF {
+		t.Close()
+		return
+	}
+	if err != nil {
+		return nil, connectionErrorf(false, err, "transport: http2Server.HandleStreams failed to read initial settings frame: %v", err)
+	}
+	atomic.StoreUint32(&t.activity, 1)
+	sf, ok := frame.(*http2.SettingsFrame)
+	if !ok {
+		return nil, connectionErrorf(false, nil, "transport: http2Server.HandleStreams saw invalid preface type %T from client", frame)
+	}
+	t.handleSettings(sf)
+
 	go func() {
 		loopyWriter(t.ctx, t.controlBuf, t.itemHandler)
 		t.Close()
@ -354,41 +379,6 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 // typically run in a separate goroutine.
 // traceCtx attaches trace to ctx and returns the new context.
 func (t *http2Server) HandleStreams(handle func(*Stream), traceCtx func(context.Context, string) context.Context) {
-	// Check the validity of client preface.
-	preface := make([]byte, len(clientPreface))
-	if _, err := io.ReadFull(t.conn, preface); err != nil {
-		// Only log if it isn't a simple tcp accept check (ie: tcp balancer doing open/close socket)
-		if err != io.EOF {
-			errorf("transport: http2Server.HandleStreams failed to receive the preface from client: %v", err)
-		}
-		t.Close()
-		return
-	}
-	if !bytes.Equal(preface, clientPreface) {
-		errorf("transport: http2Server.HandleStreams received bogus greeting from client: %q", preface)
-		t.Close()
-		return
-	}
-
-	frame, err := t.framer.fr.ReadFrame()
-	if err == io.EOF || err == io.ErrUnexpectedEOF {
-		t.Close()
-		return
-	}
-	if err != nil {
-		errorf("transport: http2Server.HandleStreams failed to read initial settings frame: %v", err)
-		t.Close()
-		return
-	}
-	atomic.StoreUint32(&t.activity, 1)
-	sf, ok := frame.(*http2.SettingsFrame)
-	if !ok {
-		errorf("transport: http2Server.HandleStreams saw invalid preface type %T from client", frame)
-		t.Close()
-		return
-	}
-	t.handleSettings(sf)
-
 	for {
 		frame, err := t.framer.fr.ReadFrame()
 		atomic.StoreUint32(&t.activity, 1)