vendor: update deps for fssession

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

vendor.conf

@@ -102,6 +102,8 @@ google.golang.org/genproto d80a6e20e776b0b17a324d0ba1ab50a39c8e8944
 # containerd
 github.com/containerd/containerd 3addd840653146c90a254301d6c3a663c7fd6429
 github.com/tonistiigi/fifo 1405643975692217d6720f8b54aeee1bf2cd5cf4
+github.com/stevvooe/continuity cd7a8e21e2b6f84799f5dd4b65faf49c8d3ee02d
+github.com/tonistiigi/fsutil 0ac4c11b053b9c5c7c47558f81f96c7100ce50fb
 
 # cluster
 github.com/docker/swarmkit a4bf0135f63fb60f0e76ae81579cde87f580db6e

vendor/github.com/stevvooe/continuity/LICENSE

@@ -0,0 +1,202 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
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+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
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+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
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+      including but not limited to software source code, documentation
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+      any Contribution intentionally submitted for inclusion in the Work
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+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
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+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
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+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
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+      has been advised of the possibility of such damages.
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+      the Work or Derivative Works thereof, You may choose to offer,
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+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
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+      boilerplate notice, with the fields enclosed by brackets "{}"
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+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
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+

vendor/github.com/stevvooe/continuity/README.md

@@ -0,0 +1,19 @@
+# continuity
+
+[![GoDoc](https://godoc.org/github.com/containerd/continuity?status.svg)](https://godoc.org/github.com/containerd/continuity)
+[![Build Status](https://travis-ci.org/containerd/continuity.svg?branch=master)](https://travis-ci.org/containerd/continuity)
+
+A transport-agnostic, filesystem metadata manifest system
+
+This project is a staging area for experiments in providing transport agnostic
+metadata storage.
+
+Please see https://github.com/opencontainers/specs/issues/11 for more details.
+
+## Building Proto Package
+
+If you change the proto file you will need to rebuild the generated Go with `go generate`.
+
+```
+go generate ./proto
+```

vendor/github.com/stevvooe/continuity/sysx/asm.s

@@ -0,0 +1,10 @@
+// Copyright 2014 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !gccgo
+
+#include "textflag.h"
+
+TEXT ·use(SB),NOSPLIT,$0
+	RET

vendor/github.com/stevvooe/continuity/sysx/chmod_darwin.go

@@ -0,0 +1,18 @@
+package sysx
+
+const (
+	// AtSymlinkNoFollow defined from AT_SYMLINK_NOFOLLOW in <sys/fcntl.h>
+	AtSymlinkNofollow = 0x20
+)
+
+const (
+
+	// SYS_FCHMODAT defined from golang.org/sys/unix
+	SYS_FCHMODAT = 467
+)
+
+// These functions will be generated by generate.sh
+//    $ GOOS=darwin GOARCH=386 ./generate.sh chmod
+//    $ GOOS=darwin GOARCH=amd64 ./generate.sh chmod
+
+//sys  Fchmodat(dirfd int, path string, mode uint32, flags int) (err error)

vendor/github.com/stevvooe/continuity/sysx/chmod_darwin_386.go

@@ -0,0 +1,25 @@
+// mksyscall.pl -l32 chmod_darwin.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall6(SYS_FCHMODAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode), uintptr(flags), 0, 0)
+	use(unsafe.Pointer(_p0))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/stevvooe/continuity/sysx/chmod_darwin_amd64.go

@@ -0,0 +1,25 @@
+// mksyscall.pl chmod_darwin.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall6(SYS_FCHMODAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode), uintptr(flags), 0, 0)
+	use(unsafe.Pointer(_p0))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/stevvooe/continuity/sysx/chmod_freebsd.go

@@ -0,0 +1,17 @@
+package sysx
+
+const (
+	// AtSymlinkNoFollow defined from AT_SYMLINK_NOFOLLOW in <sys/fcntl.h>
+	AtSymlinkNofollow = 0x200
+)
+
+const (
+
+	// SYS_FCHMODAT defined from golang.org/sys/unix
+	SYS_FCHMODAT = 490
+)
+
+// These functions will be generated by generate.sh
+//    $ GOOS=freebsd GOARCH=amd64 ./generate.sh chmod
+
+//sys  Fchmodat(dirfd int, path string, mode uint32, flags int) (err error)

vendor/github.com/stevvooe/continuity/sysx/chmod_freebsd_amd64.go

@@ -0,0 +1,25 @@
+// mksyscall.pl chmod_freebsd.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall6(SYS_FCHMODAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode), uintptr(flags), 0, 0)
+	use(unsafe.Pointer(_p0))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/stevvooe/continuity/sysx/chmod_linux.go

@@ -0,0 +1,12 @@
+package sysx
+
+import "syscall"
+
+const (
+	// AtSymlinkNoFollow defined from AT_SYMLINK_NOFOLLOW in /usr/include/linux/fcntl.h
+	AtSymlinkNofollow = 0x100
+)
+
+func Fchmodat(dirfd int, path string, mode uint32, flags int) error {
+	return syscall.Fchmodat(dirfd, path, mode, flags)
+}

vendor/github.com/stevvooe/continuity/sysx/copy_linux.go

@@ -0,0 +1,9 @@
+package sysx
+
+// These functions will be generated by generate.sh
+//    $ GOOS=linux GOARCH=386 ./generate.sh copy
+//    $ GOOS=linux GOARCH=amd64 ./generate.sh copy
+//    $ GOOS=linux GOARCH=arm ./generate.sh copy
+//    $ GOOS=linux GOARCH=arm64 ./generate.sh copy
+
+//sys CopyFileRange(fdin uintptr, offin *int64, fdout uintptr, offout *int64, len int, flags int) (n int, err error)

vendor/github.com/stevvooe/continuity/sysx/copy_linux_386.go

@@ -0,0 +1,20 @@
+// mksyscall.pl -l32 copy_linux.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func CopyFileRange(fdin uintptr, offin *int64, fdout uintptr, offout *int64, len int, flags int) (n int, err error) {
+	r0, _, e1 := syscall.Syscall6(SYS_COPY_FILE_RANGE, uintptr(fdin), uintptr(unsafe.Pointer(offin)), uintptr(fdout), uintptr(unsafe.Pointer(offout)), uintptr(len), uintptr(flags))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/stevvooe/continuity/sysx/copy_linux_amd64.go

@@ -0,0 +1,20 @@
+// mksyscall.pl copy_linux.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func CopyFileRange(fdin uintptr, offin *int64, fdout uintptr, offout *int64, len int, flags int) (n int, err error) {
+	r0, _, e1 := syscall.Syscall6(SYS_COPY_FILE_RANGE, uintptr(fdin), uintptr(unsafe.Pointer(offin)), uintptr(fdout), uintptr(unsafe.Pointer(offout)), uintptr(len), uintptr(flags))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/stevvooe/continuity/sysx/copy_linux_arm.go

@@ -0,0 +1,20 @@
+// mksyscall.pl -l32 copy_linux.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func CopyFileRange(fdin uintptr, offin *int64, fdout uintptr, offout *int64, len int, flags int) (n int, err error) {
+	r0, _, e1 := syscall.Syscall6(SYS_COPY_FILE_RANGE, uintptr(fdin), uintptr(unsafe.Pointer(offin)), uintptr(fdout), uintptr(unsafe.Pointer(offout)), uintptr(len), uintptr(flags))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/stevvooe/continuity/sysx/copy_linux_arm64.go

@@ -0,0 +1,20 @@
+// mksyscall.pl copy_linux.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func CopyFileRange(fdin uintptr, offin *int64, fdout uintptr, offout *int64, len int, flags int) (n int, err error) {
+	r0, _, e1 := syscall.Syscall6(SYS_COPY_FILE_RANGE, uintptr(fdin), uintptr(unsafe.Pointer(offin)), uintptr(fdout), uintptr(unsafe.Pointer(offout)), uintptr(len), uintptr(flags))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/stevvooe/continuity/sysx/nodata_linux.go

@@ -0,0 +1,7 @@
+package sysx
+
+import (
+	"syscall"
+)
+
+const ENODATA = syscall.ENODATA

vendor/github.com/stevvooe/continuity/sysx/nodata_unix.go

@@ -0,0 +1,9 @@
+// +build darwin freebsd
+
+package sysx
+
+import (
+	"syscall"
+)
+
+const ENODATA = syscall.ENOATTR

vendor/github.com/stevvooe/continuity/sysx/sys.go

@@ -0,0 +1,37 @@
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+var _zero uintptr
+
+// use is a no-op, but the compiler cannot see that it is.
+// Calling use(p) ensures that p is kept live until that point.
+//go:noescape
+func use(p unsafe.Pointer)
+
+// Do the interface allocations only once for common
+// Errno values.
+var (
+	errEAGAIN error = syscall.EAGAIN
+	errEINVAL error = syscall.EINVAL
+	errENOENT error = syscall.ENOENT
+)
+
+// errnoErr returns common boxed Errno values, to prevent
+// allocations at runtime.
+func errnoErr(e syscall.Errno) error {
+	switch e {
+	case 0:
+		return nil
+	case syscall.EAGAIN:
+		return errEAGAIN
+	case syscall.EINVAL:
+		return errEINVAL
+	case syscall.ENOENT:
+		return errENOENT
+	}
+	return e
+}

vendor/github.com/stevvooe/continuity/sysx/sysnum_linux_386.go

@@ -0,0 +1,7 @@
+package sysx
+
+const (
+	// SYS_COPYFILERANGE defined in Kernel 4.5+
+	// Number defined in /usr/include/asm/unistd_32.h
+	SYS_COPY_FILE_RANGE = 377
+)

vendor/github.com/stevvooe/continuity/sysx/sysnum_linux_amd64.go

@@ -0,0 +1,7 @@
+package sysx
+
+const (
+	// SYS_COPYFILERANGE defined in Kernel 4.5+
+	// Number defined in /usr/include/asm/unistd_64.h
+	SYS_COPY_FILE_RANGE = 326
+)

vendor/github.com/stevvooe/continuity/sysx/sysnum_linux_arm.go

@@ -0,0 +1,7 @@
+package sysx
+
+const (
+	// SYS_COPY_FILE_RANGE defined in Kernel 4.5+
+	// Number defined in /usr/include/arm-linux-gnueabihf/asm/unistd.h
+	SYS_COPY_FILE_RANGE = 391
+)

vendor/github.com/stevvooe/continuity/sysx/sysnum_linux_arm64.go

@@ -0,0 +1,7 @@
+package sysx
+
+const (
+	// SYS_COPY_FILE_RANGE defined in Kernel 4.5+
+	// Number defined in /usr/include/asm-generic/unistd.h
+	SYS_COPY_FILE_RANGE = 285
+)

vendor/github.com/stevvooe/continuity/sysx/xattr.go

@@ -0,0 +1,67 @@
+package sysx
+
+import (
+	"bytes"
+	"fmt"
+	"syscall"
+)
+
+const defaultXattrBufferSize = 5
+
+var ErrNotSupported = fmt.Errorf("not supported")
+
+type listxattrFunc func(path string, dest []byte) (int, error)
+
+func listxattrAll(path string, listFunc listxattrFunc) ([]string, error) {
+	var p []byte // nil on first execution
+
+	for {
+		n, err := listFunc(path, p) // first call gets buffer size.
+		if err != nil {
+			return nil, err
+		}
+
+		if n > len(p) {
+			p = make([]byte, n)
+			continue
+		}
+
+		p = p[:n]
+
+		ps := bytes.Split(bytes.TrimSuffix(p, []byte{0}), []byte{0})
+		var entries []string
+		for _, p := range ps {
+			s := string(p)
+			if s != "" {
+				entries = append(entries, s)
+			}
+		}
+
+		return entries, nil
+	}
+}
+
+type getxattrFunc func(string, string, []byte) (int, error)
+
+func getxattrAll(path, attr string, getFunc getxattrFunc) ([]byte, error) {
+	p := make([]byte, defaultXattrBufferSize)
+	for {
+		n, err := getFunc(path, attr, p)
+		if err != nil {
+			if errno, ok := err.(syscall.Errno); ok && errno == syscall.ERANGE {
+				p = make([]byte, len(p)*2) // this can't be ideal.
+				continue                   // try again!
+			}
+
+			return nil, err
+		}
+
+		// realloc to correct size and repeat
+		if n > len(p) {
+			p = make([]byte, n)
+			continue
+		}
+
+		return p[:n], nil
+	}
+}

vendor/github.com/stevvooe/continuity/sysx/xattr_darwin.go

@@ -0,0 +1,71 @@
+package sysx
+
+// These functions will be generated by generate.sh
+//    $ GOOS=darwin GOARCH=386 ./generate.sh xattr
+//    $ GOOS=darwin GOARCH=amd64 ./generate.sh xattr
+
+//sys  getxattr(path string, attr string, dest []byte, pos int, options int) (sz int, err error)
+//sys  setxattr(path string, attr string, data []byte, flags int) (err error)
+//sys  removexattr(path string, attr string, options int) (err error)
+//sys  listxattr(path string, dest []byte, options int) (sz int, err error)
+//sys  Fchmodat(dirfd int, path string, mode uint32, flags int) (err error)
+
+const (
+	xattrNoFollow = 0x01
+)
+
+func listxattrFollow(path string, dest []byte) (sz int, err error) {
+	return listxattr(path, dest, 0)
+}
+
+// Listxattr calls syscall getxattr
+func Listxattr(path string) ([]string, error) {
+	return listxattrAll(path, listxattrFollow)
+}
+
+// Removexattr calls syscall getxattr
+func Removexattr(path string, attr string) (err error) {
+	return removexattr(path, attr, 0)
+}
+
+// Setxattr calls syscall setxattr
+func Setxattr(path string, attr string, data []byte, flags int) (err error) {
+	return setxattr(path, attr, data, flags)
+}
+
+func getxattrFollow(path, attr string, dest []byte) (sz int, err error) {
+	return getxattr(path, attr, dest, 0, 0)
+}
+
+// Getxattr calls syscall getxattr
+func Getxattr(path, attr string) ([]byte, error) {
+	return getxattrAll(path, attr, getxattrFollow)
+}
+
+func listxattrNoFollow(path string, dest []byte) (sz int, err error) {
+	return listxattr(path, dest, xattrNoFollow)
+}
+
+// LListxattr calls syscall listxattr with XATTR_NOFOLLOW
+func LListxattr(path string) ([]string, error) {
+	return listxattrAll(path, listxattrNoFollow)
+}
+
+// LRemovexattr calls syscall removexattr with XATTR_NOFOLLOW
+func LRemovexattr(path string, attr string) (err error) {
+	return removexattr(path, attr, xattrNoFollow)
+}
+
+// Setxattr calls syscall setxattr with XATTR_NOFOLLOW
+func LSetxattr(path string, attr string, data []byte, flags int) (err error) {
+	return setxattr(path, attr, data, flags|xattrNoFollow)
+}
+
+func getxattrNoFollow(path, attr string, dest []byte) (sz int, err error) {
+	return getxattr(path, attr, dest, 0, xattrNoFollow)
+}
+
+// LGetxattr calls syscall getxattr with XATTR_NOFOLLOW
+func LGetxattr(path, attr string) ([]byte, error) {
+	return getxattrAll(path, attr, getxattrNoFollow)
+}

vendor/github.com/stevvooe/continuity/sysx/xattr_darwin_386.go

@@ -0,0 +1,111 @@
+// mksyscall.pl -l32 xattr_darwin.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func getxattr(path string, attr string, dest []byte, pos int, options int) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(dest) > 0 {
+		_p2 = unsafe.Pointer(&dest[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall6(syscall.SYS_GETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(dest)), uintptr(pos), uintptr(options))
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func setxattr(path string, attr string, data []byte, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(data) > 0 {
+		_p2 = unsafe.Pointer(&data[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	_, _, e1 := syscall.Syscall6(syscall.SYS_SETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(data)), uintptr(flags), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func removexattr(path string, attr string, options int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall(syscall.SYS_REMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(options))
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func listxattr(path string, dest []byte, options int) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 unsafe.Pointer
+	if len(dest) > 0 {
+		_p1 = unsafe.Pointer(&dest[0])
+	} else {
+		_p1 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall6(syscall.SYS_LISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(dest)), uintptr(options), 0, 0)
+	use(unsafe.Pointer(_p0))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/stevvooe/continuity/sysx/xattr_darwin_amd64.go

@@ -0,0 +1,111 @@
+// mksyscall.pl xattr_darwin.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func getxattr(path string, attr string, dest []byte, pos int, options int) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(dest) > 0 {
+		_p2 = unsafe.Pointer(&dest[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall6(syscall.SYS_GETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(dest)), uintptr(pos), uintptr(options))
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func setxattr(path string, attr string, data []byte, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(data) > 0 {
+		_p2 = unsafe.Pointer(&data[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	_, _, e1 := syscall.Syscall6(syscall.SYS_SETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(data)), uintptr(flags), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func removexattr(path string, attr string, options int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall(syscall.SYS_REMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(options))
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func listxattr(path string, dest []byte, options int) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 unsafe.Pointer
+	if len(dest) > 0 {
+		_p1 = unsafe.Pointer(&dest[0])
+	} else {
+		_p1 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall6(syscall.SYS_LISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(dest)), uintptr(options), 0, 0)
+	use(unsafe.Pointer(_p0))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/stevvooe/continuity/sysx/xattr_freebsd.go

@@ -0,0 +1,53 @@
+package sysx
+
+import (
+	"errors"
+)
+
+// Initial stub version for FreeBSD. FreeBSD has a different
+// syscall API from Darwin and Linux for extended attributes;
+// it is also not widely used. It is not exposed at all by the
+// Go syscall package, so we need to implement directly eventually.
+
+var unsupported error = errors.New("extended attributes unsupported on FreeBSD")
+
+// Listxattr calls syscall listxattr and reads all content
+// and returns a string array
+func Listxattr(path string) ([]string, error) {
+	return []string{}, nil
+}
+
+// Removexattr calls syscall removexattr
+func Removexattr(path string, attr string) (err error) {
+	return unsupported
+}
+
+// Setxattr calls syscall setxattr
+func Setxattr(path string, attr string, data []byte, flags int) (err error) {
+	return unsupported
+}
+
+// Getxattr calls syscall getxattr
+func Getxattr(path, attr string) ([]byte, error) {
+	return []byte{}, nil
+}
+
+// LListxattr lists xattrs, not following symlinks
+func LListxattr(path string) ([]string, error) {
+	return []string{}, nil
+}
+
+// LRemovexattr removes an xattr, not following symlinks
+func LRemovexattr(path string, attr string) (err error) {
+	return unsupported
+}
+
+// LSetxattr sets an xattr, not following symlinks
+func LSetxattr(path string, attr string, data []byte, flags int) (err error) {
+	return unsupported
+}
+
+// LGetxattr gets an xattr, not following symlinks
+func LGetxattr(path, attr string) ([]byte, error) {
+	return []byte{}, nil
+}

vendor/github.com/stevvooe/continuity/sysx/xattr_linux.go

@@ -0,0 +1,61 @@
+package sysx
+
+import "syscall"
+
+// These functions will be generated by generate.sh
+//    $ GOOS=linux GOARCH=386 ./generate.sh xattr
+//    $ GOOS=linux GOARCH=amd64 ./generate.sh xattr
+//    $ GOOS=linux GOARCH=arm ./generate.sh xattr
+//    $ GOOS=linux GOARCH=arm64 ./generate.sh xattr
+//    $ GOOS=linux GOARCH=ppc64 ./generate.sh xattr
+//    $ GOOS=linux GOARCH=ppc64le ./generate.sh xattr
+//    $ GOOS=linux GOARCH=s390x ./generate.sh xattr
+
+// Listxattr calls syscall listxattr and reads all content
+// and returns a string array
+func Listxattr(path string) ([]string, error) {
+	return listxattrAll(path, syscall.Listxattr)
+}
+
+// Removexattr calls syscall removexattr
+func Removexattr(path string, attr string) (err error) {
+	return syscall.Removexattr(path, attr)
+}
+
+// Setxattr calls syscall setxattr
+func Setxattr(path string, attr string, data []byte, flags int) (err error) {
+	return syscall.Setxattr(path, attr, data, flags)
+}
+
+// Getxattr calls syscall getxattr
+func Getxattr(path, attr string) ([]byte, error) {
+	return getxattrAll(path, attr, syscall.Getxattr)
+}
+
+//sys llistxattr(path string, dest []byte) (sz int, err error)
+
+// LListxattr lists xattrs, not following symlinks
+func LListxattr(path string) ([]string, error) {
+	return listxattrAll(path, llistxattr)
+}
+
+//sys lremovexattr(path string, attr string) (err error)
+
+// LRemovexattr removes an xattr, not following symlinks
+func LRemovexattr(path string, attr string) (err error) {
+	return lremovexattr(path, attr)
+}
+
+//sys lsetxattr(path string, attr string, data []byte, flags int) (err error)
+
+// LSetxattr sets an xattr, not following symlinks
+func LSetxattr(path string, attr string, data []byte, flags int) (err error) {
+	return lsetxattr(path, attr, data, flags)
+}
+
+//sys lgetxattr(path string, attr string, dest []byte) (sz int, err error)
+
+// LGetxattr gets an xattr, not following symlinks
+func LGetxattr(path, attr string) ([]byte, error) {
+	return getxattrAll(path, attr, lgetxattr)
+}

vendor/github.com/stevvooe/continuity/sysx/xattr_linux_386.go

@@ -0,0 +1,111 @@
+// mksyscall.pl -l32 xattr_linux.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func llistxattr(path string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 unsafe.Pointer
+	if len(dest) > 0 {
+		_p1 = unsafe.Pointer(&dest[0])
+	} else {
+		_p1 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall(syscall.SYS_LLISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(dest)))
+	use(unsafe.Pointer(_p0))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lremovexattr(path string, attr string) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall(syscall.SYS_LREMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lsetxattr(path string, attr string, data []byte, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(data) > 0 {
+		_p2 = unsafe.Pointer(&data[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	_, _, e1 := syscall.Syscall6(syscall.SYS_LSETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(data)), uintptr(flags), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lgetxattr(path string, attr string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(dest) > 0 {
+		_p2 = unsafe.Pointer(&dest[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(dest)), 0, 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/stevvooe/continuity/sysx/xattr_linux_amd64.go

@@ -0,0 +1,111 @@
+// mksyscall.pl xattr_linux.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func llistxattr(path string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 unsafe.Pointer
+	if len(dest) > 0 {
+		_p1 = unsafe.Pointer(&dest[0])
+	} else {
+		_p1 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall(syscall.SYS_LLISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(dest)))
+	use(unsafe.Pointer(_p0))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lremovexattr(path string, attr string) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall(syscall.SYS_LREMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lsetxattr(path string, attr string, data []byte, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(data) > 0 {
+		_p2 = unsafe.Pointer(&data[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	_, _, e1 := syscall.Syscall6(syscall.SYS_LSETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(data)), uintptr(flags), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lgetxattr(path string, attr string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(dest) > 0 {
+		_p2 = unsafe.Pointer(&dest[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(dest)), 0, 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/stevvooe/continuity/sysx/xattr_linux_arm.go

@@ -0,0 +1,111 @@
+// mksyscall.pl -l32 xattr_linux.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func llistxattr(path string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 unsafe.Pointer
+	if len(dest) > 0 {
+		_p1 = unsafe.Pointer(&dest[0])
+	} else {
+		_p1 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall(syscall.SYS_LLISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(dest)))
+	use(unsafe.Pointer(_p0))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lremovexattr(path string, attr string) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall(syscall.SYS_LREMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lsetxattr(path string, attr string, data []byte, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(data) > 0 {
+		_p2 = unsafe.Pointer(&data[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	_, _, e1 := syscall.Syscall6(syscall.SYS_LSETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(data)), uintptr(flags), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lgetxattr(path string, attr string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(dest) > 0 {
+		_p2 = unsafe.Pointer(&dest[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(dest)), 0, 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/stevvooe/continuity/sysx/xattr_linux_arm64.go

@@ -0,0 +1,111 @@
+// mksyscall.pl xattr_linux.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func llistxattr(path string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 unsafe.Pointer
+	if len(dest) > 0 {
+		_p1 = unsafe.Pointer(&dest[0])
+	} else {
+		_p1 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall(syscall.SYS_LLISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(dest)))
+	use(unsafe.Pointer(_p0))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lremovexattr(path string, attr string) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall(syscall.SYS_LREMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lsetxattr(path string, attr string, data []byte, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(data) > 0 {
+		_p2 = unsafe.Pointer(&data[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	_, _, e1 := syscall.Syscall6(syscall.SYS_LSETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(data)), uintptr(flags), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lgetxattr(path string, attr string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(dest) > 0 {
+		_p2 = unsafe.Pointer(&dest[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(dest)), 0, 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/stevvooe/continuity/sysx/xattr_linux_ppc64.go

@@ -0,0 +1,111 @@
+// mksyscall.pl xattr_linux.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func llistxattr(path string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 unsafe.Pointer
+	if len(dest) > 0 {
+		_p1 = unsafe.Pointer(&dest[0])
+	} else {
+		_p1 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall(syscall.SYS_LLISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(dest)))
+	use(unsafe.Pointer(_p0))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lremovexattr(path string, attr string) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall(syscall.SYS_LREMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lsetxattr(path string, attr string, data []byte, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(data) > 0 {
+		_p2 = unsafe.Pointer(&data[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	_, _, e1 := syscall.Syscall6(syscall.SYS_LSETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(data)), uintptr(flags), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lgetxattr(path string, attr string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(dest) > 0 {
+		_p2 = unsafe.Pointer(&dest[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(dest)), 0, 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/stevvooe/continuity/sysx/xattr_linux_ppc64le.go

@@ -0,0 +1,111 @@
+// mksyscall.pl xattr_linux.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func llistxattr(path string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 unsafe.Pointer
+	if len(dest) > 0 {
+		_p1 = unsafe.Pointer(&dest[0])
+	} else {
+		_p1 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall(syscall.SYS_LLISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(dest)))
+	use(unsafe.Pointer(_p0))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lremovexattr(path string, attr string) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall(syscall.SYS_LREMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lsetxattr(path string, attr string, data []byte, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(data) > 0 {
+		_p2 = unsafe.Pointer(&data[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	_, _, e1 := syscall.Syscall6(syscall.SYS_LSETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(data)), uintptr(flags), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lgetxattr(path string, attr string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(dest) > 0 {
+		_p2 = unsafe.Pointer(&dest[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(dest)), 0, 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/stevvooe/continuity/sysx/xattr_linux_s390x.go

@@ -0,0 +1,111 @@
+// mksyscall.pl xattr_linux.go
+// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+
+package sysx
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func llistxattr(path string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 unsafe.Pointer
+	if len(dest) > 0 {
+		_p1 = unsafe.Pointer(&dest[0])
+	} else {
+		_p1 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall(syscall.SYS_LLISTXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(dest)))
+	use(unsafe.Pointer(_p0))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lremovexattr(path string, attr string) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	_, _, e1 := syscall.Syscall(syscall.SYS_LREMOVEXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lsetxattr(path string, attr string, data []byte, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(data) > 0 {
+		_p2 = unsafe.Pointer(&data[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	_, _, e1 := syscall.Syscall6(syscall.SYS_LSETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(data)), uintptr(flags), 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func lgetxattr(path string, attr string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = syscall.BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = syscall.BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(dest) > 0 {
+		_p2 = unsafe.Pointer(&dest[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	r0, _, e1 := syscall.Syscall6(syscall.SYS_LGETXATTR, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(dest)), 0, 0)
+	use(unsafe.Pointer(_p0))
+	use(unsafe.Pointer(_p1))
+	sz = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}

vendor/github.com/tonistiigi/fsutil/LICENSE

@@ -0,0 +1,22 @@
+MIT
+
+Copyright 2017 Tõnis Tiigi <tonistiigi@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

vendor/github.com/tonistiigi/fsutil/diff.go

@@ -0,0 +1,37 @@
+package fsutil
+
+import (
+	"os"
+
+	"golang.org/x/net/context"
+)
+
+type walkerFn func(ctx context.Context, pathC chan<- *currentPath) error
+
+func Changes(ctx context.Context, a, b walkerFn, changeFn ChangeFunc) error {
+	return nil
+}
+
+type HandleChangeFn func(ChangeKind, string, os.FileInfo, error) error
+
+func GetWalkerFn(root string) walkerFn {
+	return func(ctx context.Context, pathC chan<- *currentPath) error {
+		return Walk(ctx, root, nil, func(path string, f os.FileInfo, err error) error {
+			if err != nil {
+				return err
+			}
+
+			p := &currentPath{
+				path: path,
+				f:    f,
+			}
+
+			select {
+			case <-ctx.Done():
+				return ctx.Err()
+			case pathC <- p:
+				return nil
+			}
+		})
+	}
+}

vendor/github.com/tonistiigi/fsutil/diff_containerd.go

@@ -0,0 +1,199 @@
+package fsutil
+
+import (
+	"os"
+	"strings"
+
+	"golang.org/x/net/context"
+	"golang.org/x/sync/errgroup"
+)
+
+// Everything below is copied from containerd/fs. TODO: remove duplication @dmcgowan
+
+// Const redefined because containerd/fs doesn't build on !linux
+
+// ChangeKind is the type of modification that
+// a change is making.
+type ChangeKind int
+
+const (
+	// ChangeKindAdd represents an addition of
+	// a file
+	ChangeKindAdd ChangeKind = iota
+
+	// ChangeKindModify represents a change to
+	// an existing file
+	ChangeKindModify
+
+	// ChangeKindDelete represents a delete of
+	// a file
+	ChangeKindDelete
+)
+
+// ChangeFunc is the type of function called for each change
+// computed during a directory changes calculation.
+type ChangeFunc func(ChangeKind, string, os.FileInfo, error) error
+
+type currentPath struct {
+	path string
+	f    os.FileInfo
+	//	fullPath string
+}
+
+// doubleWalkDiff walks both directories to create a diff
+func doubleWalkDiff(ctx context.Context, changeFn ChangeFunc, a, b walkerFn) (err error) {
+	g, ctx := errgroup.WithContext(ctx)
+
+	var (
+		c1 = make(chan *currentPath, 128)
+		c2 = make(chan *currentPath, 128)
+
+		f1, f2 *currentPath
+		rmdir  string
+	)
+	g.Go(func() error {
+		defer close(c1)
+		return a(ctx, c1)
+	})
+	g.Go(func() error {
+		defer close(c2)
+		return b(ctx, c2)
+	})
+	g.Go(func() error {
+	loop0:
+		for c1 != nil || c2 != nil {
+			if f1 == nil && c1 != nil {
+				f1, err = nextPath(ctx, c1)
+				if err != nil {
+					return err
+				}
+				if f1 == nil {
+					c1 = nil
+				}
+			}
+
+			if f2 == nil && c2 != nil {
+				f2, err = nextPath(ctx, c2)
+				if err != nil {
+					return err
+				}
+				if f2 == nil {
+					c2 = nil
+				}
+			}
+			if f1 == nil && f2 == nil {
+				continue
+			}
+
+			var f os.FileInfo
+			k, p := pathChange(f1, f2)
+			switch k {
+			case ChangeKindAdd:
+				if rmdir != "" {
+					rmdir = ""
+				}
+				f = f2.f
+				f2 = nil
+			case ChangeKindDelete:
+				// Check if this file is already removed by being
+				// under of a removed directory
+				if rmdir != "" && strings.HasPrefix(f1.path, rmdir) {
+					f1 = nil
+					continue
+				} else if rmdir == "" && f1.f.IsDir() {
+					rmdir = f1.path + string(os.PathSeparator)
+				} else if rmdir != "" {
+					rmdir = ""
+				}
+				f1 = nil
+			case ChangeKindModify:
+				same, err := sameFile(f1, f2)
+				if err != nil {
+					return err
+				}
+				if f1.f.IsDir() && !f2.f.IsDir() {
+					rmdir = f1.path + string(os.PathSeparator)
+				} else if rmdir != "" {
+					rmdir = ""
+				}
+				f = f2.f
+				f1 = nil
+				f2 = nil
+				if same {
+					continue loop0
+				}
+			}
+			if err := changeFn(k, p, f, nil); err != nil {
+				return err
+			}
+		}
+		return nil
+	})
+
+	return g.Wait()
+}
+
+func pathChange(lower, upper *currentPath) (ChangeKind, string) {
+	if lower == nil {
+		if upper == nil {
+			panic("cannot compare nil paths")
+		}
+		return ChangeKindAdd, upper.path
+	}
+	if upper == nil {
+		return ChangeKindDelete, lower.path
+	}
+
+	switch i := ComparePath(lower.path, upper.path); {
+	case i < 0:
+		// File in lower that is not in upper
+		return ChangeKindDelete, lower.path
+	case i > 0:
+		// File in upper that is not in lower
+		return ChangeKindAdd, upper.path
+	default:
+		return ChangeKindModify, upper.path
+	}
+}
+
+func sameFile(f1, f2 *currentPath) (same bool, retErr error) {
+	// If not a directory also check size, modtime, and content
+	if !f1.f.IsDir() {
+		if f1.f.Size() != f2.f.Size() {
+			return false, nil
+		}
+
+		t1 := f1.f.ModTime()
+		t2 := f2.f.ModTime()
+		if t1.UnixNano() != t2.UnixNano() {
+			return false, nil
+		}
+	}
+
+	ls1, ok := f1.f.Sys().(*Stat)
+	if !ok {
+		return false, nil
+	}
+	ls2, ok := f1.f.Sys().(*Stat)
+	if !ok {
+		return false, nil
+	}
+
+	return compareStat(ls1, ls2)
+}
+
+// compareStat returns whether the stats are equivalent,
+// whether the files are considered the same file, and
+// an error
+func compareStat(ls1, ls2 *Stat) (bool, error) {
+	return ls1.Mode == ls2.Mode && ls1.Uid == ls2.Uid && ls1.Gid == ls2.Gid && ls1.Devmajor == ls2.Devmajor && ls1.Devminor == ls2.Devminor && ls1.Linkname == ls2.Linkname, nil
+}
+
+func nextPath(ctx context.Context, pathC <-chan *currentPath) (*currentPath, error) {
+	select {
+	case <-ctx.Done():
+		return nil, ctx.Err()
+	case p := <-pathC:
+		return p, nil
+	}
+}

vendor/github.com/tonistiigi/fsutil/diff_containerd_linux.go

@@ -0,0 +1,37 @@
+package fsutil
+
+import (
+	"bytes"
+	"syscall"
+
+	"github.com/pkg/errors"
+	"github.com/stevvooe/continuity/sysx"
+)
+
+// compareSysStat returns whether the stats are equivalent,
+// whether the files are considered the same file, and
+// an error
+func compareSysStat(s1, s2 interface{}) (bool, error) {
+	ls1, ok := s1.(*syscall.Stat_t)
+	if !ok {
+		return false, nil
+	}
+	ls2, ok := s2.(*syscall.Stat_t)
+	if !ok {
+		return false, nil
+	}
+
+	return ls1.Mode == ls2.Mode && ls1.Uid == ls2.Uid && ls1.Gid == ls2.Gid && ls1.Rdev == ls2.Rdev, nil
+}
+
+func compareCapabilities(p1, p2 string) (bool, error) {
+	c1, err := sysx.LGetxattr(p1, "security.capability")
+	if err != nil && err != syscall.ENODATA {
+		return false, errors.Wrapf(err, "failed to get xattr for %s", p1)
+	}
+	c2, err := sysx.LGetxattr(p2, "security.capability")
+	if err != nil && err != syscall.ENODATA {
+		return false, errors.Wrapf(err, "failed to get xattr for %s", p2)
+	}
+	return bytes.Equal(c1, c2), nil
+}

vendor/github.com/tonistiigi/fsutil/diskwriter.go

@@ -0,0 +1,353 @@
+// +build linux windows
+
+package fsutil
+
+import (
+	"archive/tar"
+	"crypto/sha256"
+	"encoding/hex"
+	"hash"
+	"io"
+	"os"
+	"path/filepath"
+	"strconv"
+	"sync"
+	"time"
+
+	"github.com/docker/docker/pkg/archive"
+	"github.com/docker/docker/pkg/tarsum"
+	"github.com/pkg/errors"
+	"golang.org/x/net/context"
+	"golang.org/x/sync/errgroup"
+)
+
+type WriteToFunc func(context.Context, string, io.WriteCloser) error
+
+type DiskWriterOpt struct {
+	AsyncDataCb WriteToFunc
+	SyncDataCb  WriteToFunc
+	NotifyCb    func(ChangeKind, string, os.FileInfo, error) error
+}
+
+type DiskWriter struct {
+	opt  DiskWriterOpt
+	dest string
+
+	wg     sync.WaitGroup
+	ctx    context.Context
+	cancel func()
+	eg     *errgroup.Group
+}
+
+func NewDiskWriter(ctx context.Context, dest string, opt DiskWriterOpt) (*DiskWriter, error) {
+	if opt.SyncDataCb == nil && opt.AsyncDataCb == nil {
+		return nil, errors.New("no data callback specified")
+	}
+	if opt.SyncDataCb != nil && opt.AsyncDataCb != nil {
+		return nil, errors.New("can't specify both sync and async data callbacks")
+	}
+
+	ctx, cancel := context.WithCancel(ctx)
+	eg, ctx := errgroup.WithContext(ctx)
+
+	return &DiskWriter{
+		opt:    opt,
+		dest:   dest,
+		eg:     eg,
+		ctx:    ctx,
+		cancel: cancel,
+	}, nil
+}
+
+func (dw *DiskWriter) Wait(ctx context.Context) error {
+	return dw.eg.Wait()
+}
+
+func (dw *DiskWriter) HandleChange(kind ChangeKind, p string, fi os.FileInfo, err error) (retErr error) {
+	if err != nil {
+		return err
+	}
+
+	select {
+	case <-dw.ctx.Done():
+		return dw.ctx.Err()
+	default:
+	}
+
+	defer func() {
+		if retErr != nil {
+			dw.cancel()
+		}
+	}()
+
+	p = filepath.FromSlash(p)
+
+	destPath := filepath.Join(dw.dest, p)
+
+	if kind == ChangeKindDelete {
+		// todo: no need to validate if diff is trusted but is it always?
+		if err := os.RemoveAll(destPath); err != nil {
+			return errors.Wrapf(err, "failed to remove: %s", destPath)
+		}
+		if dw.opt.NotifyCb != nil {
+			if err := dw.opt.NotifyCb(kind, p, nil, nil); err != nil {
+				return err
+			}
+		}
+		return nil
+	}
+
+	stat, ok := fi.Sys().(*Stat)
+	if !ok {
+		return errors.Errorf("%s invalid change without stat information", p)
+	}
+
+	rename := true
+	oldFi, err := os.Lstat(destPath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			if kind != ChangeKindAdd {
+				return errors.Wrapf(err, "invalid addition: %s", destPath)
+			}
+			rename = false
+		} else {
+			return errors.Wrapf(err, "failed to stat %s", destPath)
+		}
+	}
+
+	if oldFi != nil && fi.IsDir() && oldFi.IsDir() {
+		if err := rewriteMetadata(destPath, stat); err != nil {
+			return errors.Wrapf(err, "error setting dir metadata for %s", destPath)
+		}
+		return nil
+	}
+
+	newPath := destPath
+	if rename {
+		newPath = filepath.Join(filepath.Dir(destPath), ".tmp."+nextSuffix())
+	}
+
+	isRegularFile := false
+
+	switch {
+	case fi.IsDir():
+		if err := os.Mkdir(newPath, fi.Mode()); err != nil {
+			return errors.Wrapf(err, "failed to create dir %s", newPath)
+		}
+	case fi.Mode()&os.ModeDevice != 0 || fi.Mode()&os.ModeNamedPipe != 0:
+		if err := handleTarTypeBlockCharFifo(newPath, stat); err != nil {
+			return errors.Wrapf(err, "failed to create device %s", newPath)
+		}
+	case fi.Mode()&os.ModeSymlink != 0:
+		if err := os.Symlink(stat.Linkname, newPath); err != nil {
+			return errors.Wrapf(err, "failed to symlink %s", newPath)
+		}
+	case stat.Linkname != "":
+		if err := os.Link(filepath.Join(dw.dest, stat.Linkname), newPath); err != nil {
+			return errors.Wrapf(err, "failed to link %s to %s", newPath, stat.Linkname)
+		}
+	default:
+		isRegularFile = true
+		file, err := os.OpenFile(newPath, os.O_CREATE|os.O_WRONLY, fi.Mode()) //todo: windows
+		if err != nil {
+			return errors.Wrapf(err, "failed to create %s", newPath)
+		}
+		if dw.opt.SyncDataCb != nil {
+			if err := dw.processChange(ChangeKindAdd, p, fi, file); err != nil {
+				file.Close()
+				return err
+			}
+			break
+		}
+		if err := file.Close(); err != nil {
+			return errors.Wrapf(err, "failed to close %s", newPath)
+		}
+	}
+
+	if err := rewriteMetadata(newPath, stat); err != nil {
+		return errors.Wrapf(err, "error setting metadata for %s", newPath)
+	}
+
+	if rename {
+		if err := os.Rename(newPath, destPath); err != nil {
+			return errors.Wrapf(err, "failed to rename %s to %s", newPath, destPath)
+		}
+	}
+
+	if isRegularFile {
+		if dw.opt.AsyncDataCb != nil {
+			dw.requestAsyncFileData(p, destPath, fi)
+		}
+	} else {
+		return dw.processChange(kind, p, fi, nil)
+	}
+
+	return nil
+}
+
+func (dw *DiskWriter) requestAsyncFileData(p, dest string, fi os.FileInfo) {
+	// todo: limit worker threads
+	dw.eg.Go(func() error {
+		if err := dw.processChange(ChangeKindAdd, p, fi, &lazyFileWriter{
+			dest: dest,
+		}); err != nil {
+			return err
+		}
+		return chtimes(dest, fi.ModTime().UnixNano()) // TODO: parent dirs
+	})
+}
+
+func (dw *DiskWriter) processChange(kind ChangeKind, p string, fi os.FileInfo, w io.WriteCloser) error {
+	origw := w
+	var hw *hashedWriter
+	if dw.opt.NotifyCb != nil {
+		var err error
+		if hw, err = newHashWriter(p, fi, w); err != nil {
+			return err
+		}
+		w = hw
+	}
+	if origw != nil {
+		fn := dw.opt.SyncDataCb
+		if fn == nil && dw.opt.AsyncDataCb != nil {
+			fn = dw.opt.AsyncDataCb
+		}
+		if err := fn(dw.ctx, p, w); err != nil {
+			return err
+		}
+	} else {
+		if hw != nil {
+			hw.Close()
+		}
+	}
+	if hw != nil {
+		return dw.opt.NotifyCb(kind, p, hw, nil)
+	}
+	return nil
+}
+
+type hashedWriter struct {
+	os.FileInfo
+	io.Writer
+	h   hash.Hash
+	w   io.WriteCloser
+	sum string
+}
+
+func newHashWriter(p string, fi os.FileInfo, w io.WriteCloser) (*hashedWriter, error) {
+	h, err := NewTarsumHash(p, fi)
+	if err != nil {
+		return nil, err
+	}
+	hw := &hashedWriter{
+		FileInfo: fi,
+		Writer:   io.MultiWriter(w, h),
+		h:        h,
+		w:        w,
+	}
+	return hw, nil
+}
+
+func (hw *hashedWriter) Close() error {
+	hw.sum = string(hex.EncodeToString(hw.h.Sum(nil)))
+	if hw.w != nil {
+		return hw.w.Close()
+	}
+	return nil
+}
+
+func (hw *hashedWriter) Hash() string {
+	return hw.sum
+}
+
+type lazyFileWriter struct {
+	dest string
+	ctx  context.Context
+	f    *os.File
+}
+
+func (lfw *lazyFileWriter) Write(dt []byte) (int, error) {
+	if lfw.f == nil {
+		file, err := os.OpenFile(lfw.dest, os.O_WRONLY, 0) //todo: windows
+		if err != nil {
+			return 0, errors.Wrapf(err, "failed to open %s", lfw.dest)
+		}
+		lfw.f = file
+	}
+	return lfw.f.Write(dt)
+}
+
+func (lfw *lazyFileWriter) Close() error {
+	if lfw.f != nil {
+		return lfw.f.Close()
+	}
+	return nil
+}
+
+func mkdev(major int64, minor int64) uint32 {
+	return uint32(((minor & 0xfff00) << 12) | ((major & 0xfff) << 8) | (minor & 0xff))
+}
+
+// Random number state.
+// We generate random temporary file names so that there's a good
+// chance the file doesn't exist yet - keeps the number of tries in
+// TempFile to a minimum.
+var rand uint32
+var randmu sync.Mutex
+
+func reseed() uint32 {
+	return uint32(time.Now().UnixNano() + int64(os.Getpid()))
+}
+
+func nextSuffix() string {
+	randmu.Lock()
+	r := rand
+	if r == 0 {
+		r = reseed()
+	}
+	r = r*1664525 + 1013904223 // constants from Numerical Recipes
+	rand = r
+	randmu.Unlock()
+	return strconv.Itoa(int(1e9 + r%1e9))[1:]
+}
+
+func NewTarsumHash(p string, fi os.FileInfo) (hash.Hash, error) {
+	stat, ok := fi.Sys().(*Stat)
+	link := ""
+	if ok {
+		link = stat.Linkname
+	}
+	if fi.IsDir() {
+		p += string(os.PathSeparator)
+	}
+	h, err := archive.FileInfoHeader(p, fi, link)
+	if err != nil {
+		return nil, err
+	}
+	h.Name = p
+	if ok {
+		h.Uid = int(stat.Uid)
+		h.Gid = int(stat.Gid)
+		h.Linkname = stat.Linkname
+		if stat.Xattrs != nil {
+			h.Xattrs = make(map[string]string)
+			for k, v := range stat.Xattrs {
+				h.Xattrs[k] = string(v)
+			}
+		}
+	}
+	tsh := &tarsumHash{h: h, Hash: sha256.New()}
+	tsh.Reset()
+	return tsh, nil
+}
+
+// Reset resets the Hash to its initial state.
+func (tsh *tarsumHash) Reset() {
+	tsh.Hash.Reset()
+	tarsum.WriteV1Header(tsh.h, tsh.Hash)
+}
+
+type tarsumHash struct {
+	hash.Hash
+	h *tar.Header
+}

vendor/github.com/tonistiigi/fsutil/diskwriter_linux.go

@@ -0,0 +1,64 @@
+// +build linux
+
+package fsutil
+
+import (
+	"os"
+	"syscall"
+
+	"github.com/pkg/errors"
+	"github.com/stevvooe/continuity/sysx"
+	"golang.org/x/sys/unix"
+)
+
+func rewriteMetadata(p string, stat *Stat) error {
+	for key, value := range stat.Xattrs {
+		sysx.Setxattr(p, key, value, 0)
+	}
+
+	if err := os.Lchown(p, int(stat.Uid), int(stat.Gid)); err != nil {
+		return errors.Wrapf(err, "failed to lchown %s", p)
+	}
+
+	if os.FileMode(stat.Mode)&os.ModeSymlink == 0 {
+		if err := os.Chmod(p, os.FileMode(stat.Mode)); err != nil {
+			return errors.Wrapf(err, "failed to chown %s", p)
+		}
+	}
+
+	if err := chtimes(p, stat.ModTime); err != nil {
+		return errors.Wrapf(err, "failed to chtimes %s", p)
+	}
+
+	return nil
+}
+
+func chtimes(path string, un int64) error {
+	var utimes [2]unix.Timespec
+	utimes[0] = unix.NsecToTimespec(un)
+	utimes[1] = utimes[0]
+
+	if err := unix.UtimesNanoAt(unix.AT_FDCWD, path, utimes[0:], unix.AT_SYMLINK_NOFOLLOW); err != nil {
+		return errors.Wrap(err, "failed call to UtimesNanoAt")
+	}
+
+	return nil
+}
+
+// handleTarTypeBlockCharFifo is an OS-specific helper function used by
+// createTarFile to handle the following types of header: Block; Char; Fifo
+func handleTarTypeBlockCharFifo(path string, stat *Stat) error {
+	mode := uint32(stat.Mode & 07777)
+	if os.FileMode(stat.Mode)&os.ModeCharDevice != 0 {
+		mode |= syscall.S_IFCHR
+	} else if os.FileMode(stat.Mode)&os.ModeNamedPipe != 0 {
+		mode |= syscall.S_IFIFO
+	} else {
+		mode |= syscall.S_IFBLK
+	}
+
+	if err := syscall.Mknod(path, mode, int(mkdev(stat.Devmajor, stat.Devminor))); err != nil {
+		return err
+	}
+	return nil
+}

vendor/github.com/tonistiigi/fsutil/diskwriter_windows.go

@@ -0,0 +1,25 @@
+// +build windows
+
+package fsutil
+
+import (
+	"os"
+	"time"
+
+	"github.com/pkg/errors"
+)
+
+func rewriteMetadata(p string, stat *Stat) error {
+	return chtimes(p, stat.ModTime)
+}
+
+func chtimes(path string, un int64) error {
+	mtime := time.Unix(0, un)
+	return os.Chtimes(path, mtime, mtime)
+}
+
+// handleTarTypeBlockCharFifo is an OS-specific helper function used by
+// createTarFile to handle the following types of header: Block; Char; Fifo
+func handleTarTypeBlockCharFifo(path string, stat *Stat) error {
+	return errors.New("Not implemented on windows")
+}

vendor/github.com/tonistiigi/fsutil/generate.go

@@ -0,0 +1,3 @@
+package fsutil
+
+//go:generate protoc --gogoslick_out=. stat.proto wire.proto

vendor/github.com/tonistiigi/fsutil/hardlinks.go

@@ -0,0 +1,46 @@
+package fsutil
+
+import (
+	"os"
+
+	"github.com/pkg/errors"
+)
+
+// Hardlinks validates that all targets for links were part of the changes
+
+type Hardlinks struct {
+	seenFiles map[string]struct{}
+}
+
+func (v *Hardlinks) HandleChange(kind ChangeKind, p string, fi os.FileInfo, err error) error {
+	if err != nil {
+		return err
+	}
+
+	if v.seenFiles == nil {
+		v.seenFiles = make(map[string]struct{})
+	}
+
+	if kind == ChangeKindDelete {
+		return nil
+	}
+
+	stat, ok := fi.Sys().(*Stat)
+	if !ok {
+		return errors.Errorf("invalid change without stat info: %s", p)
+	}
+
+	if fi.IsDir() || fi.Mode()&os.ModeSymlink != 0 {
+		return nil
+	}
+
+	if len(stat.Linkname) > 0 {
+		if _, ok := v.seenFiles[stat.Linkname]; !ok {
+			return errors.Errorf("invalid link %s to unknown path: %q", p, stat.Linkname)
+		}
+	} else {
+		v.seenFiles[p] = struct{}{}
+	}
+
+	return nil
+}

vendor/github.com/tonistiigi/fsutil/readme.md

@@ -0,0 +1,45 @@
+Incremental file directory sync tools in golang.
+
+```
+BENCH_FILE_SIZE=10000 ./bench.test --test.bench .
+BenchmarkCopyWithTar10-4                	    2000	    995242 ns/op
+BenchmarkCopyWithTar50-4                	     300	   4710021 ns/op
+BenchmarkCopyWithTar200-4               	     100	  16627260 ns/op
+BenchmarkCopyWithTar1000-4              	      20	  60031459 ns/op
+BenchmarkCPA10-4                        	    1000	   1678367 ns/op
+BenchmarkCPA50-4                        	     500	   3690306 ns/op
+BenchmarkCPA200-4                       	     200	   9495066 ns/op
+BenchmarkCPA1000-4                      	      50	  29769289 ns/op
+BenchmarkDiffCopy10-4                   	    2000	    943889 ns/op
+BenchmarkDiffCopy50-4                   	     500	   3285950 ns/op
+BenchmarkDiffCopy200-4                  	     200	   8563792 ns/op
+BenchmarkDiffCopy1000-4                 	      50	  29511340 ns/op
+BenchmarkDiffCopyProto10-4              	    2000	    944615 ns/op
+BenchmarkDiffCopyProto50-4              	     500	   3334940 ns/op
+BenchmarkDiffCopyProto200-4             	     200	   9420038 ns/op
+BenchmarkDiffCopyProto1000-4            	      50	  30632429 ns/op
+BenchmarkIncrementalDiffCopy10-4        	    2000	    691993 ns/op
+BenchmarkIncrementalDiffCopy50-4        	    1000	   1304253 ns/op
+BenchmarkIncrementalDiffCopy200-4       	     500	   3306519 ns/op
+BenchmarkIncrementalDiffCopy1000-4      	     200	  10211343 ns/op
+BenchmarkIncrementalDiffCopy5000-4      	      20	  55194427 ns/op
+BenchmarkIncrementalDiffCopy10000-4     	      20	  91759289 ns/op
+BenchmarkIncrementalCopyWithTar10-4     	    2000	   1020258 ns/op
+BenchmarkIncrementalCopyWithTar50-4     	     300	   5348786 ns/op
+BenchmarkIncrementalCopyWithTar200-4    	     100	  19495000 ns/op
+BenchmarkIncrementalCopyWithTar1000-4   	      20	  70338507 ns/op
+BenchmarkIncrementalRsync10-4           	      30	  45215754 ns/op
+BenchmarkIncrementalRsync50-4           	      30	  45837260 ns/op
+BenchmarkIncrementalRsync200-4          	      30	  48780614 ns/op
+BenchmarkIncrementalRsync1000-4         	      20	  54801892 ns/op
+BenchmarkIncrementalRsync5000-4         	      20	  84782542 ns/op
+BenchmarkIncrementalRsync10000-4        	      10	 103355108 ns/op
+BenchmarkRsync10-4                      	      30	  46776470 ns/op
+BenchmarkRsync50-4                      	      30	  48601555 ns/op
+BenchmarkRsync200-4                     	      20	  59642691 ns/op
+BenchmarkRsync1000-4                    	      20	 101343010 ns/op
+BenchmarkGnuTar10-4                     	     500	   3171448 ns/op
+BenchmarkGnuTar50-4                     	     300	   5030296 ns/op
+BenchmarkGnuTar200-4                    	     100	  10464313 ns/op
+BenchmarkGnuTar1000-4                   	      50	  30375257 ns/op
+```

vendor/github.com/tonistiigi/fsutil/receive.go

@@ -0,0 +1,210 @@
+// +build linux windows
+
+package fsutil
+
+import (
+	"io"
+	"os"
+	"sync"
+
+	"github.com/pkg/errors"
+	"golang.org/x/net/context"
+	"golang.org/x/sync/errgroup"
+)
+
+func Receive(ctx context.Context, conn Stream, dest string, notifyHashed ChangeFunc) error {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	r := &receiver{
+		conn:         &syncStream{Stream: conn},
+		dest:         dest,
+		files:        make(map[string]uint32),
+		pipes:        make(map[uint32]io.WriteCloser),
+		notifyHashed: notifyHashed,
+	}
+	return r.run(ctx)
+}
+
+type receiver struct {
+	dest    string
+	conn    Stream
+	files   map[string]uint32
+	pipes   map[uint32]io.WriteCloser
+	mu      sync.RWMutex
+	muPipes sync.RWMutex
+
+	notifyHashed   ChangeFunc
+	orderValidator Validator
+	hlValidator    Hardlinks
+}
+
+type dynamicWalker struct {
+	walkChan chan *currentPath
+	closed   bool
+}
+
+func newDynamicWalker() *dynamicWalker {
+	return &dynamicWalker{
+		walkChan: make(chan *currentPath, 128),
+	}
+}
+
+func (w *dynamicWalker) update(p *currentPath) error {
+	if w.closed {
+		return errors.New("walker is closed")
+	}
+	if p == nil {
+		close(w.walkChan)
+		return nil
+	}
+	w.walkChan <- p
+	return nil
+}
+
+func (w *dynamicWalker) fill(ctx context.Context, pathC chan<- *currentPath) error {
+	for {
+		select {
+		case p, ok := <-w.walkChan:
+			if !ok {
+				return nil
+			}
+			pathC <- p
+		case <-ctx.Done():
+			return ctx.Err()
+		}
+	}
+	return nil
+}
+
+func (r *receiver) run(ctx context.Context) error {
+	g, ctx := errgroup.WithContext(ctx)
+
+	dw, err := NewDiskWriter(ctx, r.dest, DiskWriterOpt{
+		AsyncDataCb: r.asyncDataFunc,
+		NotifyCb:    r.notifyHashed,
+	})
+	if err != nil {
+		return err
+	}
+
+	w := newDynamicWalker()
+
+	g.Go(func() error {
+		err := doubleWalkDiff(ctx, dw.HandleChange, GetWalkerFn(r.dest), w.fill)
+		if err != nil {
+			return err
+		}
+		if err := dw.Wait(ctx); err != nil {
+			return err
+		}
+		r.conn.SendMsg(&Packet{Type: PACKET_FIN})
+		return nil
+	})
+
+	g.Go(func() error {
+		var i uint32 = 0
+
+		var p Packet
+		for {
+			p = Packet{Data: p.Data[:0]}
+			if err := r.conn.RecvMsg(&p); err != nil {
+				return err
+			}
+			switch p.Type {
+			case PACKET_STAT:
+				if p.Stat == nil {
+					if err := w.update(nil); err != nil {
+						return err
+					}
+					break
+				}
+				if fileCanRequestData(os.FileMode(p.Stat.Mode)) {
+					r.mu.Lock()
+					r.files[p.Stat.Path] = i
+					r.mu.Unlock()
+				}
+				i++
+				cp := &currentPath{path: p.Stat.Path, f: &StatInfo{p.Stat}}
+				if err := r.orderValidator.HandleChange(ChangeKindAdd, cp.path, cp.f, nil); err != nil {
+					return err
+				}
+				if err := r.hlValidator.HandleChange(ChangeKindAdd, cp.path, cp.f, nil); err != nil {
+					return err
+				}
+				if err := w.update(cp); err != nil {
+					return err
+				}
+			case PACKET_DATA:
+				r.muPipes.Lock()
+				pw, ok := r.pipes[p.ID]
+				r.muPipes.Unlock()
+				if !ok {
+					return errors.Errorf("invalid file request %s", p.ID)
+				}
+				if len(p.Data) == 0 {
+					if err := pw.Close(); err != nil {
+						return err
+					}
+				} else {
+					if _, err := pw.Write(p.Data); err != nil {
+						return err
+					}
+				}
+			case PACKET_FIN:
+				return nil
+			}
+		}
+	})
+	return g.Wait()
+}
+
+func (r *receiver) asyncDataFunc(ctx context.Context, p string, wc io.WriteCloser) error {
+	r.mu.Lock()
+	id, ok := r.files[p]
+	if !ok {
+		r.mu.Unlock()
+		return errors.Errorf("invalid file request %s", p)
+	}
+	delete(r.files, p)
+	r.mu.Unlock()
+
+	wwc := newWrappedWriteCloser(wc)
+	r.muPipes.Lock()
+	r.pipes[id] = wwc
+	r.muPipes.Unlock()
+	if err := r.conn.SendMsg(&Packet{Type: PACKET_REQ, ID: id}); err != nil {
+		return err
+	}
+	err := wwc.Wait(ctx)
+	r.muPipes.Lock()
+	delete(r.pipes, id)
+	r.muPipes.Unlock()
+	return err
+}
+
+type wrappedWriteCloser struct {
+	io.WriteCloser
+	err  error
+	once sync.Once
+	done chan struct{}
+}
+
+func newWrappedWriteCloser(wc io.WriteCloser) *wrappedWriteCloser {
+	return &wrappedWriteCloser{WriteCloser: wc, done: make(chan struct{})}
+}
+
+func (w *wrappedWriteCloser) Close() error {
+	w.err = w.WriteCloser.Close()
+	w.once.Do(func() { close(w.done) })
+	return w.err
+}
+
+func (w *wrappedWriteCloser) Wait(ctx context.Context) error {
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	case <-w.done:
+		return w.err
+	}
+}

vendor/github.com/tonistiigi/fsutil/receive_unsupported.go

@@ -0,0 +1,14 @@
+// +build !linux,!windows
+
+package fsutil
+
+import (
+	"runtime"
+
+	"github.com/pkg/errors"
+	"golang.org/x/net/context"
+)
+
+func Receive(ctx context.Context, conn Stream, dest string, notifyHashed ChangeFunc) error {
+	return errors.Errorf("receive is unsupported in %s", runtime.GOOS)
+}

vendor/github.com/tonistiigi/fsutil/send.go

@@ -0,0 +1,201 @@
+package fsutil
+
+import (
+	"io"
+	"os"
+	"path/filepath"
+	"sync"
+
+	"github.com/pkg/errors"
+	"golang.org/x/net/context"
+	"golang.org/x/sync/errgroup"
+)
+
+var bufPool = sync.Pool{
+	New: func() interface{} {
+		return make([]byte, 32*1<<10)
+	},
+}
+
+type Stream interface {
+	RecvMsg(interface{}) error
+	SendMsg(m interface{}) error
+	Context() context.Context
+}
+
+func Send(ctx context.Context, conn Stream, root string, opt *WalkOpt, progressCb func(int, bool)) error {
+	s := &sender{
+		conn:         &syncStream{Stream: conn},
+		root:         root,
+		opt:          opt,
+		files:        make(map[uint32]string),
+		progressCb:   progressCb,
+		sendpipeline: make(chan *sendHandle, 128),
+	}
+	return s.run(ctx)
+}
+
+type sendHandle struct {
+	id   uint32
+	path string
+}
+
+type sender struct {
+	conn            Stream
+	opt             *WalkOpt
+	root            string
+	files           map[uint32]string
+	mu              sync.RWMutex
+	progressCb      func(int, bool)
+	progressCurrent int
+	sendpipeline    chan *sendHandle
+}
+
+func (s *sender) run(ctx context.Context) error {
+	g, ctx := errgroup.WithContext(ctx)
+
+	defer s.updateProgress(0, true)
+
+	g.Go(func() error {
+		return s.walk(ctx)
+	})
+
+	for i := 0; i < 4; i++ {
+		g.Go(func() error {
+			for h := range s.sendpipeline {
+				select {
+				case <-ctx.Done():
+					return ctx.Err()
+				default:
+				}
+				if err := s.sendFile(h); err != nil {
+					return err
+				}
+			}
+			return nil
+		})
+	}
+
+	g.Go(func() error {
+		defer close(s.sendpipeline)
+
+		for {
+			select {
+			case <-ctx.Done():
+				return ctx.Err()
+			default:
+			}
+			var p Packet
+			if err := s.conn.RecvMsg(&p); err != nil {
+				return err
+			}
+			switch p.Type {
+			case PACKET_REQ:
+				if err := s.queue(p.ID); err != nil {
+					return err
+				}
+			case PACKET_FIN:
+				return s.conn.SendMsg(&Packet{Type: PACKET_FIN})
+			}
+		}
+	})
+
+	return g.Wait()
+}
+
+func (s *sender) updateProgress(size int, last bool) {
+	if s.progressCb != nil {
+		s.progressCurrent += size
+		s.progressCb(s.progressCurrent, last)
+	}
+}
+
+func (s *sender) queue(id uint32) error {
+	s.mu.Lock()
+	p, ok := s.files[id]
+	if !ok {
+		s.mu.Unlock()
+		return errors.Errorf("invalid file id %d", id)
+	}
+	delete(s.files, id)
+	s.mu.Unlock()
+	s.sendpipeline <- &sendHandle{id, p}
+	return nil
+}
+
+func (s *sender) sendFile(h *sendHandle) error {
+	f, err := os.Open(filepath.Join(s.root, h.path))
+	if err == nil {
+		buf := bufPool.Get().([]byte)
+		defer bufPool.Put(buf)
+		if _, err := io.CopyBuffer(&fileSender{sender: s, id: h.id}, f, buf); err != nil {
+			return err
+		}
+	}
+	return s.conn.SendMsg(&Packet{ID: h.id, Type: PACKET_DATA})
+}
+
+func (s *sender) walk(ctx context.Context) error {
+	var i uint32 = 0
+	err := Walk(ctx, s.root, s.opt, func(path string, fi os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		stat, ok := fi.Sys().(*Stat)
+		if !ok {
+			return errors.Wrapf(err, "invalid fileinfo without stat info: %s", path)
+		}
+
+		p := &Packet{
+			Type: PACKET_STAT,
+			Stat: stat,
+		}
+		if fileCanRequestData(os.FileMode(stat.Mode)) {
+			s.mu.Lock()
+			s.files[i] = stat.Path
+			s.mu.Unlock()
+		}
+		i++
+		s.updateProgress(p.Size(), false)
+		return errors.Wrapf(s.conn.SendMsg(p), "failed to send stat %s", path)
+	})
+	if err != nil {
+		return err
+	}
+	return errors.Wrapf(s.conn.SendMsg(&Packet{Type: PACKET_STAT}), "failed to send last stat")
+}
+
+func fileCanRequestData(m os.FileMode) bool {
+	// avoid updating this function as it needs to match between sender/receiver.
+	// version if needed
+	return m&os.ModeType == 0
+}
+
+type fileSender struct {
+	sender *sender
+	id     uint32
+}
+
+func (fs *fileSender) Write(dt []byte) (int, error) {
+	if len(dt) == 0 {
+		return 0, nil
+	}
+	p := &Packet{Type: PACKET_DATA, ID: fs.id, Data: dt}
+	if err := fs.sender.conn.SendMsg(p); err != nil {
+		return 0, err
+	}
+	fs.sender.updateProgress(p.Size(), false)
+	return len(dt), nil
+}
+
+type syncStream struct {
+	Stream
+	mu sync.Mutex
+}
+
+func (ss *syncStream) SendMsg(m interface{}) error {
+	ss.mu.Lock()
+	err := ss.Stream.SendMsg(m)
+	ss.mu.Unlock()
+	return err
+}

vendor/github.com/tonistiigi/fsutil/stat.pb.go

@@ -0,0 +1,931 @@
+// Code generated by protoc-gen-gogo.
+// source: stat.proto
+// DO NOT EDIT!
+
+/*
+	Package fsutil is a generated protocol buffer package.
+
+	It is generated from these files:
+		stat.proto
+		wire.proto
+
+	It has these top-level messages:
+		Stat
+		Packet
+*/
+package fsutil
+
+import proto "github.com/gogo/protobuf/proto"
+import fmt "fmt"
+import math "math"
+
+import bytes "bytes"
+
+import strings "strings"
+import reflect "reflect"
+import github_com_gogo_protobuf_sortkeys "github.com/gogo/protobuf/sortkeys"
+
+import io "io"
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.GoGoProtoPackageIsVersion2 // please upgrade the proto package
+
+type Stat struct {
+	Path    string `protobuf:"bytes,1,opt,name=path,proto3" json:"path,omitempty"`
+	Mode    uint32 `protobuf:"varint,2,opt,name=mode,proto3" json:"mode,omitempty"`
+	Uid     uint32 `protobuf:"varint,3,opt,name=uid,proto3" json:"uid,omitempty"`
+	Gid     uint32 `protobuf:"varint,4,opt,name=gid,proto3" json:"gid,omitempty"`
+	Size_   int64  `protobuf:"varint,5,opt,name=size,proto3" json:"size,omitempty"`
+	ModTime int64  `protobuf:"varint,6,opt,name=modTime,proto3" json:"modTime,omitempty"`
+	// int32 typeflag = 7;
+	Linkname string            `protobuf:"bytes,7,opt,name=linkname,proto3" json:"linkname,omitempty"`
+	Devmajor int64             `protobuf:"varint,8,opt,name=devmajor,proto3" json:"devmajor,omitempty"`
+	Devminor int64             `protobuf:"varint,9,opt,name=devminor,proto3" json:"devminor,omitempty"`
+	Xattrs   map[string][]byte `protobuf:"bytes,10,rep,name=xattrs" json:"xattrs,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+}
+
+func (m *Stat) Reset()                    { *m = Stat{} }
+func (*Stat) ProtoMessage()               {}
+func (*Stat) Descriptor() ([]byte, []int) { return fileDescriptorStat, []int{0} }
+
+func (m *Stat) GetPath() string {
+	if m != nil {
+		return m.Path
+	}
+	return ""
+}
+
+func (m *Stat) GetMode() uint32 {
+	if m != nil {
+		return m.Mode
+	}
+	return 0
+}
+
+func (m *Stat) GetUid() uint32 {
+	if m != nil {
+		return m.Uid
+	}
+	return 0
+}
+
+func (m *Stat) GetGid() uint32 {
+	if m != nil {
+		return m.Gid
+	}
+	return 0
+}
+
+func (m *Stat) GetSize_() int64 {
+	if m != nil {
+		return m.Size_
+	}
+	return 0
+}
+
+func (m *Stat) GetModTime() int64 {
+	if m != nil {
+		return m.ModTime
+	}
+	return 0
+}
+
+func (m *Stat) GetLinkname() string {
+	if m != nil {
+		return m.Linkname
+	}
+	return ""
+}
+
+func (m *Stat) GetDevmajor() int64 {
+	if m != nil {
+		return m.Devmajor
+	}
+	return 0
+}
+
+func (m *Stat) GetDevminor() int64 {
+	if m != nil {
+		return m.Devminor
+	}
+	return 0
+}
+
+func (m *Stat) GetXattrs() map[string][]byte {
+	if m != nil {
+		return m.Xattrs
+	}
+	return nil
+}
+
+func init() {
+	proto.RegisterType((*Stat)(nil), "fsutil.Stat")
+}
+func (this *Stat) Equal(that interface{}) bool {
+	if that == nil {
+		if this == nil {
+			return true
+		}
+		return false
+	}
+
+	that1, ok := that.(*Stat)
+	if !ok {
+		that2, ok := that.(Stat)
+		if ok {
+			that1 = &that2
+		} else {
+			return false
+		}
+	}
+	if that1 == nil {
+		if this == nil {
+			return true
+		}
+		return false
+	} else if this == nil {
+		return false
+	}
+	if this.Path != that1.Path {
+		return false
+	}
+	if this.Mode != that1.Mode {
+		return false
+	}
+	if this.Uid != that1.Uid {
+		return false
+	}
+	if this.Gid != that1.Gid {
+		return false
+	}
+	if this.Size_ != that1.Size_ {
+		return false
+	}
+	if this.ModTime != that1.ModTime {
+		return false
+	}
+	if this.Linkname != that1.Linkname {
+		return false
+	}
+	if this.Devmajor != that1.Devmajor {
+		return false
+	}
+	if this.Devminor != that1.Devminor {
+		return false
+	}
+	if len(this.Xattrs) != len(that1.Xattrs) {
+		return false
+	}
+	for i := range this.Xattrs {
+		if !bytes.Equal(this.Xattrs[i], that1.Xattrs[i]) {
+			return false
+		}
+	}
+	return true
+}
+func (this *Stat) GoString() string {
+	if this == nil {
+		return "nil"
+	}
+	s := make([]string, 0, 14)
+	s = append(s, "&fsutil.Stat{")
+	s = append(s, "Path: "+fmt.Sprintf("%#v", this.Path)+",\n")
+	s = append(s, "Mode: "+fmt.Sprintf("%#v", this.Mode)+",\n")
+	s = append(s, "Uid: "+fmt.Sprintf("%#v", this.Uid)+",\n")
+	s = append(s, "Gid: "+fmt.Sprintf("%#v", this.Gid)+",\n")
+	s = append(s, "Size_: "+fmt.Sprintf("%#v", this.Size_)+",\n")
+	s = append(s, "ModTime: "+fmt.Sprintf("%#v", this.ModTime)+",\n")
+	s = append(s, "Linkname: "+fmt.Sprintf("%#v", this.Linkname)+",\n")
+	s = append(s, "Devmajor: "+fmt.Sprintf("%#v", this.Devmajor)+",\n")
+	s = append(s, "Devminor: "+fmt.Sprintf("%#v", this.Devminor)+",\n")
+	keysForXattrs := make([]string, 0, len(this.Xattrs))
+	for k, _ := range this.Xattrs {
+		keysForXattrs = append(keysForXattrs, k)
+	}
+	github_com_gogo_protobuf_sortkeys.Strings(keysForXattrs)
+	mapStringForXattrs := "map[string][]byte{"
+	for _, k := range keysForXattrs {
+		mapStringForXattrs += fmt.Sprintf("%#v: %#v,", k, this.Xattrs[k])
+	}
+	mapStringForXattrs += "}"
+	if this.Xattrs != nil {
+		s = append(s, "Xattrs: "+mapStringForXattrs+",\n")
+	}
+	s = append(s, "}")
+	return strings.Join(s, "")
+}
+func valueToGoStringStat(v interface{}, typ string) string {
+	rv := reflect.ValueOf(v)
+	if rv.IsNil() {
+		return "nil"
+	}
+	pv := reflect.Indirect(rv).Interface()
+	return fmt.Sprintf("func(v %v) *%v { return &v } ( %#v )", typ, typ, pv)
+}
+func (m *Stat) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalTo(dAtA)
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *Stat) MarshalTo(dAtA []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	if len(m.Path) > 0 {
+		dAtA[i] = 0xa
+		i++
+		i = encodeVarintStat(dAtA, i, uint64(len(m.Path)))
+		i += copy(dAtA[i:], m.Path)
+	}
+	if m.Mode != 0 {
+		dAtA[i] = 0x10
+		i++
+		i = encodeVarintStat(dAtA, i, uint64(m.Mode))
+	}
+	if m.Uid != 0 {
+		dAtA[i] = 0x18
+		i++
+		i = encodeVarintStat(dAtA, i, uint64(m.Uid))
+	}
+	if m.Gid != 0 {
+		dAtA[i] = 0x20
+		i++
+		i = encodeVarintStat(dAtA, i, uint64(m.Gid))
+	}
+	if m.Size_ != 0 {
+		dAtA[i] = 0x28
+		i++
+		i = encodeVarintStat(dAtA, i, uint64(m.Size_))
+	}
+	if m.ModTime != 0 {
+		dAtA[i] = 0x30
+		i++
+		i = encodeVarintStat(dAtA, i, uint64(m.ModTime))
+	}
+	if len(m.Linkname) > 0 {
+		dAtA[i] = 0x3a
+		i++
+		i = encodeVarintStat(dAtA, i, uint64(len(m.Linkname)))
+		i += copy(dAtA[i:], m.Linkname)
+	}
+	if m.Devmajor != 0 {
+		dAtA[i] = 0x40
+		i++
+		i = encodeVarintStat(dAtA, i, uint64(m.Devmajor))
+	}
+	if m.Devminor != 0 {
+		dAtA[i] = 0x48
+		i++
+		i = encodeVarintStat(dAtA, i, uint64(m.Devminor))
+	}
+	if len(m.Xattrs) > 0 {
+		for k, _ := range m.Xattrs {
+			dAtA[i] = 0x52
+			i++
+			v := m.Xattrs[k]
+			byteSize := 0
+			if len(v) > 0 {
+				byteSize = 1 + len(v) + sovStat(uint64(len(v)))
+			}
+			mapSize := 1 + len(k) + sovStat(uint64(len(k))) + byteSize
+			i = encodeVarintStat(dAtA, i, uint64(mapSize))
+			dAtA[i] = 0xa
+			i++
+			i = encodeVarintStat(dAtA, i, uint64(len(k)))
+			i += copy(dAtA[i:], k)
+			if len(v) > 0 {
+				dAtA[i] = 0x12
+				i++
+				i = encodeVarintStat(dAtA, i, uint64(len(v)))
+				i += copy(dAtA[i:], v)
+			}
+		}
+	}
+	return i, nil
+}
+
+func encodeFixed64Stat(dAtA []byte, offset int, v uint64) int {
+	dAtA[offset] = uint8(v)
+	dAtA[offset+1] = uint8(v >> 8)
+	dAtA[offset+2] = uint8(v >> 16)
+	dAtA[offset+3] = uint8(v >> 24)
+	dAtA[offset+4] = uint8(v >> 32)
+	dAtA[offset+5] = uint8(v >> 40)
+	dAtA[offset+6] = uint8(v >> 48)
+	dAtA[offset+7] = uint8(v >> 56)
+	return offset + 8
+}
+func encodeFixed32Stat(dAtA []byte, offset int, v uint32) int {
+	dAtA[offset] = uint8(v)
+	dAtA[offset+1] = uint8(v >> 8)
+	dAtA[offset+2] = uint8(v >> 16)
+	dAtA[offset+3] = uint8(v >> 24)
+	return offset + 4
+}
+func encodeVarintStat(dAtA []byte, offset int, v uint64) int {
+	for v >= 1<<7 {
+		dAtA[offset] = uint8(v&0x7f | 0x80)
+		v >>= 7
+		offset++
+	}
+	dAtA[offset] = uint8(v)
+	return offset + 1
+}
+func (m *Stat) Size() (n int) {
+	var l int
+	_ = l
+	l = len(m.Path)
+	if l > 0 {
+		n += 1 + l + sovStat(uint64(l))
+	}
+	if m.Mode != 0 {
+		n += 1 + sovStat(uint64(m.Mode))
+	}
+	if m.Uid != 0 {
+		n += 1 + sovStat(uint64(m.Uid))
+	}
+	if m.Gid != 0 {
+		n += 1 + sovStat(uint64(m.Gid))
+	}
+	if m.Size_ != 0 {
+		n += 1 + sovStat(uint64(m.Size_))
+	}
+	if m.ModTime != 0 {
+		n += 1 + sovStat(uint64(m.ModTime))
+	}
+	l = len(m.Linkname)
+	if l > 0 {
+		n += 1 + l + sovStat(uint64(l))
+	}
+	if m.Devmajor != 0 {
+		n += 1 + sovStat(uint64(m.Devmajor))
+	}
+	if m.Devminor != 0 {
+		n += 1 + sovStat(uint64(m.Devminor))
+	}
+	if len(m.Xattrs) > 0 {
+		for k, v := range m.Xattrs {
+			_ = k
+			_ = v
+			l = 0
+			if len(v) > 0 {
+				l = 1 + len(v) + sovStat(uint64(len(v)))
+			}
+			mapEntrySize := 1 + len(k) + sovStat(uint64(len(k))) + l
+			n += mapEntrySize + 1 + sovStat(uint64(mapEntrySize))
+		}
+	}
+	return n
+}
+
+func sovStat(x uint64) (n int) {
+	for {
+		n++
+		x >>= 7
+		if x == 0 {
+			break
+		}
+	}
+	return n
+}
+func sozStat(x uint64) (n int) {
+	return sovStat(uint64((x << 1) ^ uint64((int64(x) >> 63))))
+}
+func (this *Stat) String() string {
+	if this == nil {
+		return "nil"
+	}
+	keysForXattrs := make([]string, 0, len(this.Xattrs))
+	for k, _ := range this.Xattrs {
+		keysForXattrs = append(keysForXattrs, k)
+	}
+	github_com_gogo_protobuf_sortkeys.Strings(keysForXattrs)
+	mapStringForXattrs := "map[string][]byte{"
+	for _, k := range keysForXattrs {
+		mapStringForXattrs += fmt.Sprintf("%v: %v,", k, this.Xattrs[k])
+	}
+	mapStringForXattrs += "}"
+	s := strings.Join([]string{`&Stat{`,
+		`Path:` + fmt.Sprintf("%v", this.Path) + `,`,
+		`Mode:` + fmt.Sprintf("%v", this.Mode) + `,`,
+		`Uid:` + fmt.Sprintf("%v", this.Uid) + `,`,
+		`Gid:` + fmt.Sprintf("%v", this.Gid) + `,`,
+		`Size_:` + fmt.Sprintf("%v", this.Size_) + `,`,
+		`ModTime:` + fmt.Sprintf("%v", this.ModTime) + `,`,
+		`Linkname:` + fmt.Sprintf("%v", this.Linkname) + `,`,
+		`Devmajor:` + fmt.Sprintf("%v", this.Devmajor) + `,`,
+		`Devminor:` + fmt.Sprintf("%v", this.Devminor) + `,`,
+		`Xattrs:` + mapStringForXattrs + `,`,
+		`}`,
+	}, "")
+	return s
+}
+func valueToStringStat(v interface{}) string {
+	rv := reflect.ValueOf(v)
+	if rv.IsNil() {
+		return "nil"
+	}
+	pv := reflect.Indirect(rv).Interface()
+	return fmt.Sprintf("*%v", pv)
+}
+func (m *Stat) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowStat
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: Stat: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: Stat: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Path", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowStat
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthStat
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Path = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 2:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Mode", wireType)
+			}
+			m.Mode = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowStat
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Mode |= (uint32(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 3:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Uid", wireType)
+			}
+			m.Uid = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowStat
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Uid |= (uint32(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 4:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Gid", wireType)
+			}
+			m.Gid = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowStat
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Gid |= (uint32(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 5:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Size_", wireType)
+			}
+			m.Size_ = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowStat
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Size_ |= (int64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 6:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ModTime", wireType)
+			}
+			m.ModTime = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowStat
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.ModTime |= (int64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 7:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Linkname", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowStat
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthStat
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Linkname = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		case 8:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Devmajor", wireType)
+			}
+			m.Devmajor = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowStat
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Devmajor |= (int64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 9:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Devminor", wireType)
+			}
+			m.Devminor = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowStat
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Devminor |= (int64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 10:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Xattrs", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowStat
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthStat
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			var keykey uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowStat
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				keykey |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			var stringLenmapkey uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowStat
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLenmapkey |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLenmapkey := int(stringLenmapkey)
+			if intStringLenmapkey < 0 {
+				return ErrInvalidLengthStat
+			}
+			postStringIndexmapkey := iNdEx + intStringLenmapkey
+			if postStringIndexmapkey > l {
+				return io.ErrUnexpectedEOF
+			}
+			mapkey := string(dAtA[iNdEx:postStringIndexmapkey])
+			iNdEx = postStringIndexmapkey
+			if m.Xattrs == nil {
+				m.Xattrs = make(map[string][]byte)
+			}
+			if iNdEx < postIndex {
+				var valuekey uint64
+				for shift := uint(0); ; shift += 7 {
+					if shift >= 64 {
+						return ErrIntOverflowStat
+					}
+					if iNdEx >= l {
+						return io.ErrUnexpectedEOF
+					}
+					b := dAtA[iNdEx]
+					iNdEx++
+					valuekey |= (uint64(b) & 0x7F) << shift
+					if b < 0x80 {
+						break
+					}
+				}
+				var mapbyteLen uint64
+				for shift := uint(0); ; shift += 7 {
+					if shift >= 64 {
+						return ErrIntOverflowStat
+					}
+					if iNdEx >= l {
+						return io.ErrUnexpectedEOF
+					}
+					b := dAtA[iNdEx]
+					iNdEx++
+					mapbyteLen |= (uint64(b) & 0x7F) << shift
+					if b < 0x80 {
+						break
+					}
+				}
+				intMapbyteLen := int(mapbyteLen)
+				if intMapbyteLen < 0 {
+					return ErrInvalidLengthStat
+				}
+				postbytesIndex := iNdEx + intMapbyteLen
+				if postbytesIndex > l {
+					return io.ErrUnexpectedEOF
+				}
+				mapvalue := make([]byte, mapbyteLen)
+				copy(mapvalue, dAtA[iNdEx:postbytesIndex])
+				iNdEx = postbytesIndex
+				m.Xattrs[mapkey] = mapvalue
+			} else {
+				var mapvalue []byte
+				m.Xattrs[mapkey] = mapvalue
+			}
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipStat(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthStat
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func skipStat(dAtA []byte) (n int, err error) {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return 0, ErrIntOverflowStat
+			}
+			if iNdEx >= l {
+				return 0, io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		wireType := int(wire & 0x7)
+		switch wireType {
+		case 0:
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return 0, ErrIntOverflowStat
+				}
+				if iNdEx >= l {
+					return 0, io.ErrUnexpectedEOF
+				}
+				iNdEx++
+				if dAtA[iNdEx-1] < 0x80 {
+					break
+				}
+			}
+			return iNdEx, nil
+		case 1:
+			iNdEx += 8
+			return iNdEx, nil
+		case 2:
+			var length int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return 0, ErrIntOverflowStat
+				}
+				if iNdEx >= l {
+					return 0, io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				length |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			iNdEx += length
+			if length < 0 {
+				return 0, ErrInvalidLengthStat
+			}
+			return iNdEx, nil
+		case 3:
+			for {
+				var innerWire uint64
+				var start int = iNdEx
+				for shift := uint(0); ; shift += 7 {
+					if shift >= 64 {
+						return 0, ErrIntOverflowStat
+					}
+					if iNdEx >= l {
+						return 0, io.ErrUnexpectedEOF
+					}
+					b := dAtA[iNdEx]
+					iNdEx++
+					innerWire |= (uint64(b) & 0x7F) << shift
+					if b < 0x80 {
+						break
+					}
+				}
+				innerWireType := int(innerWire & 0x7)
+				if innerWireType == 4 {
+					break
+				}
+				next, err := skipStat(dAtA[start:])
+				if err != nil {
+					return 0, err
+				}
+				iNdEx = start + next
+			}
+			return iNdEx, nil
+		case 4:
+			return iNdEx, nil
+		case 5:
+			iNdEx += 4
+			return iNdEx, nil
+		default:
+			return 0, fmt.Errorf("proto: illegal wireType %d", wireType)
+		}
+	}
+	panic("unreachable")
+}
+
+var (
+	ErrInvalidLengthStat = fmt.Errorf("proto: negative length found during unmarshaling")
+	ErrIntOverflowStat   = fmt.Errorf("proto: integer overflow")
+)
+
+func init() { proto.RegisterFile("stat.proto", fileDescriptorStat) }
+
+var fileDescriptorStat = []byte{
+	// 303 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0x4c, 0x91, 0xb1, 0x4e, 0xf3, 0x30,
+	0x14, 0x85, 0x73, 0x9b, 0x36, 0x6d, 0xdd, 0xff, 0x97, 0x90, 0xc5, 0x70, 0xd5, 0xc1, 0x8a, 0x98,
+	0x32, 0xa0, 0x08, 0xc1, 0x02, 0x8c, 0x48, 0xbc, 0x40, 0x60, 0x60, 0x35, 0xb2, 0x29, 0xa6, 0x4d,
+	0x5c, 0x25, 0x4e, 0x45, 0x99, 0x78, 0x04, 0x1e, 0x83, 0xd7, 0x60, 0x63, 0xec, 0xc8, 0x48, 0xcc,
+	0xc2, 0xd8, 0x47, 0x40, 0x76, 0xda, 0xc2, 0x76, 0xce, 0x77, 0x7c, 0x65, 0x9d, 0x7b, 0x09, 0xa9,
+	0x0c, 0x37, 0xe9, 0xbc, 0xd4, 0x46, 0xd3, 0xe8, 0xae, 0xaa, 0x8d, 0x9a, 0x1d, 0xbc, 0x75, 0x48,
+	0xf7, 0xca, 0x70, 0x43, 0x29, 0xe9, 0xce, 0xb9, 0xb9, 0x47, 0x88, 0x21, 0x19, 0x66, 0x5e, 0x3b,
+	0x96, 0x6b, 0x21, 0xb1, 0x13, 0x43, 0xf2, 0x3f, 0xf3, 0x9a, 0xee, 0x91, 0xb0, 0x56, 0x02, 0x43,
+	0x8f, 0x9c, 0x74, 0x64, 0xa2, 0x04, 0x76, 0x5b, 0x32, 0x51, 0xc2, 0xcd, 0x55, 0xea, 0x49, 0x62,
+	0x2f, 0x86, 0x24, 0xcc, 0xbc, 0xa6, 0x48, 0xfa, 0xb9, 0x16, 0xd7, 0x2a, 0x97, 0x18, 0x79, 0xbc,
+	0xb5, 0x74, 0x4c, 0x06, 0x33, 0x55, 0x4c, 0x0b, 0x9e, 0x4b, 0xec, 0xfb, 0xdf, 0x77, 0xde, 0x65,
+	0x42, 0x2e, 0x72, 0xfe, 0xa0, 0x4b, 0x1c, 0xf8, 0xb1, 0x9d, 0xdf, 0x66, 0xaa, 0xd0, 0x25, 0x0e,
+	0x7f, 0x33, 0xe7, 0xe9, 0x11, 0x89, 0x1e, 0xb9, 0x31, 0x65, 0x85, 0x24, 0x0e, 0x93, 0xd1, 0x31,
+	0xa6, 0x6d, 0xdf, 0xd4, 0x75, 0x4d, 0x6f, 0x7c, 0x74, 0x59, 0x98, 0x72, 0x99, 0x6d, 0xde, 0x8d,
+	0xcf, 0xc8, 0xe8, 0x0f, 0x76, 0xa5, 0xa6, 0x72, 0xb9, 0xd9, 0x86, 0x93, 0x74, 0x9f, 0xf4, 0x16,
+	0x7c, 0x56, 0xb7, 0xdb, 0xf8, 0x97, 0xb5, 0xe6, 0xbc, 0x73, 0x0a, 0x17, 0x87, 0xab, 0x86, 0x05,
+	0x1f, 0x0d, 0x0b, 0xd6, 0x0d, 0x83, 0x67, 0xcb, 0xe0, 0xd5, 0x32, 0x78, 0xb7, 0x0c, 0x56, 0x96,
+	0xc1, 0xa7, 0x65, 0xf0, 0x6d, 0x59, 0xb0, 0xb6, 0x0c, 0x5e, 0xbe, 0x58, 0x70, 0x1b, 0xf9, 0x03,
+	0x9c, 0xfc, 0x04, 0x00, 0x00, 0xff, 0xff, 0x19, 0x97, 0x14, 0xf4, 0x8e, 0x01, 0x00, 0x00,
+}

vendor/github.com/tonistiigi/fsutil/stat.proto

@@ -0,0 +1,17 @@
+syntax = "proto3";
+
+package fsutil;
+
+message Stat {
+  string path = 1;
+  uint32 mode = 2;
+  uint32 uid = 3;
+  uint32 gid = 4;
+  int64 size = 5;
+  int64 modTime = 6;
+  // int32 typeflag = 7;
+  string linkname = 7;
+  int64 devmajor = 8;
+  int64 devminor = 9;
+  map<string, bytes> xattrs = 10;
+}

vendor/github.com/tonistiigi/fsutil/validator.go

@@ -0,0 +1,88 @@
+package fsutil
+
+import (
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+
+	"github.com/pkg/errors"
+)
+
+type parent struct {
+	dir  string
+	last string
+}
+
+type Validator struct {
+	parentDirs []parent
+}
+
+func (v *Validator) HandleChange(kind ChangeKind, p string, fi os.FileInfo, err error) (retErr error) {
+	if err != nil {
+		return err
+	}
+	// test that all paths are in order and all parent dirs were present
+	if v.parentDirs == nil {
+		v.parentDirs = make([]parent, 1, 10)
+	}
+	if p != filepath.Clean(p) {
+		return errors.Errorf("invalid unclean path %s", p)
+	}
+	if filepath.IsAbs(p) {
+		return errors.Errorf("abolute path %s not allowed", p)
+	}
+	dir := filepath.Dir(p)
+	base := filepath.Base(p)
+	if dir == "." {
+		dir = ""
+	}
+	if dir == ".." || strings.HasPrefix(p, "../") {
+		return errors.Errorf("invalid path: %s", p)
+	}
+
+	// find a parent dir from saved records
+	i := sort.Search(len(v.parentDirs), func(i int) bool {
+		return ComparePath(v.parentDirs[len(v.parentDirs)-1-i].dir, dir) <= 0
+	})
+	i = len(v.parentDirs) - 1 - i
+	if i != len(v.parentDirs)-1 { // skipping back to grandparent
+		v.parentDirs = v.parentDirs[:i+1]
+	}
+
+	if dir != v.parentDirs[len(v.parentDirs)-1].dir || v.parentDirs[i].last >= base {
+		return errors.Errorf("changes out of order: %q %q", p, filepath.Join(v.parentDirs[i].dir, v.parentDirs[i].last))
+	}
+	v.parentDirs[i].last = base
+	if kind != ChangeKindDelete && fi.IsDir() {
+		v.parentDirs = append(v.parentDirs, parent{
+			dir:  filepath.Join(dir, base),
+			last: "",
+		})
+	}
+	// todo: validate invalid mode combinations
+	return err
+}
+
+func ComparePath(p1, p2 string) int {
+	// byte-by-byte comparison to be compatible with str<>str
+	min := min(len(p1), len(p2))
+	for i := 0; i < min; i++ {
+		switch {
+		case p1[i] == p2[i]:
+			continue
+		case p2[i] != '/' && p1[i] < p2[i] || p1[i] == '/':
+			return -1
+		default:
+			return 1
+		}
+	}
+	return len(p1) - len(p2)
+}
+
+func min(x, y int) int {
+	if x < y {
+		return x
+	}
+	return y
+}

vendor/github.com/tonistiigi/fsutil/walker.go

@@ -0,0 +1,170 @@
+package fsutil
+
+import (
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"time"
+
+	"github.com/docker/docker/pkg/fileutils"
+	"github.com/pkg/errors"
+	"golang.org/x/net/context"
+)
+
+type WalkOpt struct {
+	IncludePaths    []string // todo: remove?
+	ExcludePatterns []string
+}
+
+func Walk(ctx context.Context, p string, opt *WalkOpt, fn filepath.WalkFunc) error {
+	root, err := filepath.EvalSymlinks(p)
+	if err != nil {
+		return errors.Wrapf(err, "failed to resolve %s", root)
+	}
+	fi, err := os.Stat(root)
+	if err != nil {
+		return errors.Wrapf(err, "failed to stat: %s", root)
+	}
+	if !fi.IsDir() {
+		return errors.Errorf("%s is not a directory", root)
+	}
+
+	var pm *fileutils.PatternMatcher
+	if opt != nil && opt.ExcludePatterns != nil {
+		pm, err = fileutils.NewPatternMatcher(opt.ExcludePatterns)
+		if err != nil {
+			return errors.Wrapf(err, "invalid excludepaths %s", opt.ExcludePatterns)
+		}
+	}
+
+	seenFiles := make(map[uint64]string)
+	return filepath.Walk(root, func(path string, fi os.FileInfo, err error) error {
+		if err != nil {
+			if os.IsNotExist(err) {
+				return filepath.SkipDir
+			}
+			return err
+		}
+		origpath := path
+		path, err = filepath.Rel(root, path)
+		if err != nil {
+			return err
+		}
+		// Skip root
+		if path == "." {
+			return nil
+		}
+
+		if opt != nil {
+			if opt.IncludePaths != nil {
+				matched := false
+				for _, p := range opt.IncludePaths {
+					if m, _ := filepath.Match(p, path); m {
+						matched = true
+						break
+					}
+				}
+				if !matched {
+					if fi.IsDir() {
+						return filepath.SkipDir
+					}
+					return nil
+				}
+			}
+			if pm != nil {
+				m, err := pm.Matches(path)
+				if err != nil {
+					return errors.Wrap(err, "failed to match excludepatterns")
+				}
+
+				if m {
+					if fi.IsDir() {
+						if !pm.Exclusions() {
+							return filepath.SkipDir
+						}
+						dirSlash := path + string(filepath.Separator)
+						for _, pat := range pm.Patterns() {
+							if !pat.Exclusion() {
+								continue
+							}
+							patStr := pat.String() + string(filepath.Separator)
+							if strings.HasPrefix(patStr, dirSlash) {
+								goto passedFilter
+							}
+						}
+						return filepath.SkipDir
+					}
+					return nil
+				}
+			}
+		}
+
+	passedFilter:
+		path = filepath.ToSlash(path)
+
+		stat := &Stat{
+			Path:    path,
+			Mode:    uint32(fi.Mode()),
+			Size_:   fi.Size(),
+			ModTime: fi.ModTime().UnixNano(),
+		}
+
+		setUnixOpt(fi, stat, path, seenFiles)
+
+		if !fi.IsDir() {
+			if fi.Mode()&os.ModeSymlink != 0 {
+				link, err := os.Readlink(origpath)
+				if err != nil {
+					return errors.Wrapf(err, "failed to readlink %s", origpath)
+				}
+				stat.Linkname = link
+			}
+		}
+		if err := loadXattr(origpath, stat); err != nil {
+			return errors.Wrapf(err, "failed to xattr %s", path)
+		}
+
+		if runtime.GOOS == "windows" {
+			permPart := stat.Mode & uint32(os.ModePerm)
+			noPermPart := stat.Mode &^ uint32(os.ModePerm)
+			// Add the x bit: make everything +x from windows
+			permPart |= 0111
+			permPart &= 0755
+			stat.Mode = noPermPart | permPart
+		}
+
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+			if err := fn(path, &StatInfo{stat}, nil); err != nil {
+				return err
+			}
+		}
+		return nil
+	})
+}
+
+type StatInfo struct {
+	*Stat
+}
+
+func (s *StatInfo) Name() string {
+	return filepath.Base(s.Stat.Path)
+}
+func (s *StatInfo) Size() int64 {
+	return s.Stat.Size_
+}
+func (s *StatInfo) Mode() os.FileMode {
+	return os.FileMode(s.Stat.Mode)
+}
+func (s *StatInfo) ModTime() time.Time {
+	return time.Unix(s.Stat.ModTime/1e9, s.Stat.ModTime%1e9)
+}
+func (s *StatInfo) IsDir() bool {
+	return s.Mode().IsDir()
+}
+func (s *StatInfo) Sys() interface{} {
+	return s.Stat
+}

vendor/github.com/tonistiigi/fsutil/walker_unix.go

@@ -0,0 +1,61 @@
+// +build !windows
+
+package fsutil
+
+import (
+	"os"
+	"syscall"
+
+	"github.com/pkg/errors"
+	"github.com/stevvooe/continuity/sysx"
+)
+
+func loadXattr(origpath string, stat *Stat) error {
+	xattrs, err := sysx.LListxattr(origpath)
+	if err != nil {
+		return errors.Wrapf(err, "failed to xattr %s", origpath)
+	}
+	if len(xattrs) > 0 {
+		m := make(map[string][]byte)
+		for _, key := range xattrs {
+			v, err := sysx.LGetxattr(origpath, key)
+			if err == nil {
+				m[key] = v
+			}
+		}
+		stat.Xattrs = m
+	}
+	return nil
+}
+
+func setUnixOpt(fi os.FileInfo, stat *Stat, path string, seenFiles map[uint64]string) {
+	s := fi.Sys().(*syscall.Stat_t)
+
+	stat.Uid = s.Uid
+	stat.Gid = s.Gid
+
+	if !fi.IsDir() {
+		if s.Mode&syscall.S_IFBLK != 0 ||
+			s.Mode&syscall.S_IFCHR != 0 {
+			stat.Devmajor = int64(major(uint64(s.Rdev)))
+			stat.Devminor = int64(minor(uint64(s.Rdev)))
+		}
+
+		ino := s.Ino
+		if s.Nlink > 1 {
+			if oldpath, ok := seenFiles[ino]; ok {
+				stat.Linkname = oldpath
+				stat.Size_ = 0
+			}
+		}
+		seenFiles[ino] = path
+	}
+}
+
+func major(device uint64) uint64 {
+	return (device >> 8) & 0xfff
+}
+
+func minor(device uint64) uint64 {
+	return (device & 0xff) | ((device >> 12) & 0xfff00)
+}

vendor/github.com/tonistiigi/fsutil/walker_windows.go

@@ -0,0 +1,14 @@
+// +build windows
+
+package fsutil
+
+import (
+	"os"
+)
+
+func loadXattr(_ string, _ *Stat) error {
+	return nil
+}
+
+func setUnixOpt(_ os.FileInfo, _ *Stat, _ string, _ map[uint64]string) {
+}

vendor/github.com/tonistiigi/fsutil/wire.pb.go

@@ -0,0 +1,563 @@
+// Code generated by protoc-gen-gogo.
+// source: wire.proto
+// DO NOT EDIT!
+
+package fsutil
+
+import proto "github.com/gogo/protobuf/proto"
+import fmt "fmt"
+import math "math"
+
+import strconv "strconv"
+
+import bytes "bytes"
+
+import strings "strings"
+import reflect "reflect"
+
+import io "io"
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+type Packet_PacketType int32
+
+const (
+	PACKET_STAT Packet_PacketType = 0
+	PACKET_REQ  Packet_PacketType = 1
+	PACKET_DATA Packet_PacketType = 2
+	PACKET_FIN  Packet_PacketType = 3
+)
+
+var Packet_PacketType_name = map[int32]string{
+	0: "PACKET_STAT",
+	1: "PACKET_REQ",
+	2: "PACKET_DATA",
+	3: "PACKET_FIN",
+}
+var Packet_PacketType_value = map[string]int32{
+	"PACKET_STAT": 0,
+	"PACKET_REQ":  1,
+	"PACKET_DATA": 2,
+	"PACKET_FIN":  3,
+}
+
+func (Packet_PacketType) EnumDescriptor() ([]byte, []int) { return fileDescriptorWire, []int{0, 0} }
+
+type Packet struct {
+	Type Packet_PacketType `protobuf:"varint,1,opt,name=type,proto3,enum=fsutil.Packet_PacketType" json:"type,omitempty"`
+	Stat *Stat             `protobuf:"bytes,2,opt,name=stat" json:"stat,omitempty"`
+	ID   uint32            `protobuf:"varint,3,opt,name=ID,proto3" json:"ID,omitempty"`
+	Data []byte            `protobuf:"bytes,4,opt,name=data,proto3" json:"data,omitempty"`
+}
+
+func (m *Packet) Reset()                    { *m = Packet{} }
+func (*Packet) ProtoMessage()               {}
+func (*Packet) Descriptor() ([]byte, []int) { return fileDescriptorWire, []int{0} }
+
+func (m *Packet) GetType() Packet_PacketType {
+	if m != nil {
+		return m.Type
+	}
+	return PACKET_STAT
+}
+
+func (m *Packet) GetStat() *Stat {
+	if m != nil {
+		return m.Stat
+	}
+	return nil
+}
+
+func (m *Packet) GetID() uint32 {
+	if m != nil {
+		return m.ID
+	}
+	return 0
+}
+
+func (m *Packet) GetData() []byte {
+	if m != nil {
+		return m.Data
+	}
+	return nil
+}
+
+func init() {
+	proto.RegisterType((*Packet)(nil), "fsutil.Packet")
+	proto.RegisterEnum("fsutil.Packet_PacketType", Packet_PacketType_name, Packet_PacketType_value)
+}
+func (x Packet_PacketType) String() string {
+	s, ok := Packet_PacketType_name[int32(x)]
+	if ok {
+		return s
+	}
+	return strconv.Itoa(int(x))
+}
+func (this *Packet) Equal(that interface{}) bool {
+	if that == nil {
+		if this == nil {
+			return true
+		}
+		return false
+	}
+
+	that1, ok := that.(*Packet)
+	if !ok {
+		that2, ok := that.(Packet)
+		if ok {
+			that1 = &that2
+		} else {
+			return false
+		}
+	}
+	if that1 == nil {
+		if this == nil {
+			return true
+		}
+		return false
+	} else if this == nil {
+		return false
+	}
+	if this.Type != that1.Type {
+		return false
+	}
+	if !this.Stat.Equal(that1.Stat) {
+		return false
+	}
+	if this.ID != that1.ID {
+		return false
+	}
+	if !bytes.Equal(this.Data, that1.Data) {
+		return false
+	}
+	return true
+}
+func (this *Packet) GoString() string {
+	if this == nil {
+		return "nil"
+	}
+	s := make([]string, 0, 8)
+	s = append(s, "&fsutil.Packet{")
+	s = append(s, "Type: "+fmt.Sprintf("%#v", this.Type)+",\n")
+	if this.Stat != nil {
+		s = append(s, "Stat: "+fmt.Sprintf("%#v", this.Stat)+",\n")
+	}
+	s = append(s, "ID: "+fmt.Sprintf("%#v", this.ID)+",\n")
+	s = append(s, "Data: "+fmt.Sprintf("%#v", this.Data)+",\n")
+	s = append(s, "}")
+	return strings.Join(s, "")
+}
+func valueToGoStringWire(v interface{}, typ string) string {
+	rv := reflect.ValueOf(v)
+	if rv.IsNil() {
+		return "nil"
+	}
+	pv := reflect.Indirect(rv).Interface()
+	return fmt.Sprintf("func(v %v) *%v { return &v } ( %#v )", typ, typ, pv)
+}
+func (m *Packet) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalTo(dAtA)
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *Packet) MarshalTo(dAtA []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	if m.Type != 0 {
+		dAtA[i] = 0x8
+		i++
+		i = encodeVarintWire(dAtA, i, uint64(m.Type))
+	}
+	if m.Stat != nil {
+		dAtA[i] = 0x12
+		i++
+		i = encodeVarintWire(dAtA, i, uint64(m.Stat.Size()))
+		n1, err := m.Stat.MarshalTo(dAtA[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n1
+	}
+	if m.ID != 0 {
+		dAtA[i] = 0x18
+		i++
+		i = encodeVarintWire(dAtA, i, uint64(m.ID))
+	}
+	if len(m.Data) > 0 {
+		dAtA[i] = 0x22
+		i++
+		i = encodeVarintWire(dAtA, i, uint64(len(m.Data)))
+		i += copy(dAtA[i:], m.Data)
+	}
+	return i, nil
+}
+
+func encodeFixed64Wire(dAtA []byte, offset int, v uint64) int {
+	dAtA[offset] = uint8(v)
+	dAtA[offset+1] = uint8(v >> 8)
+	dAtA[offset+2] = uint8(v >> 16)
+	dAtA[offset+3] = uint8(v >> 24)
+	dAtA[offset+4] = uint8(v >> 32)
+	dAtA[offset+5] = uint8(v >> 40)
+	dAtA[offset+6] = uint8(v >> 48)
+	dAtA[offset+7] = uint8(v >> 56)
+	return offset + 8
+}
+func encodeFixed32Wire(dAtA []byte, offset int, v uint32) int {
+	dAtA[offset] = uint8(v)
+	dAtA[offset+1] = uint8(v >> 8)
+	dAtA[offset+2] = uint8(v >> 16)
+	dAtA[offset+3] = uint8(v >> 24)
+	return offset + 4
+}
+func encodeVarintWire(dAtA []byte, offset int, v uint64) int {
+	for v >= 1<<7 {
+		dAtA[offset] = uint8(v&0x7f | 0x80)
+		v >>= 7
+		offset++
+	}
+	dAtA[offset] = uint8(v)
+	return offset + 1
+}
+func (m *Packet) Size() (n int) {
+	var l int
+	_ = l
+	if m.Type != 0 {
+		n += 1 + sovWire(uint64(m.Type))
+	}
+	if m.Stat != nil {
+		l = m.Stat.Size()
+		n += 1 + l + sovWire(uint64(l))
+	}
+	if m.ID != 0 {
+		n += 1 + sovWire(uint64(m.ID))
+	}
+	l = len(m.Data)
+	if l > 0 {
+		n += 1 + l + sovWire(uint64(l))
+	}
+	return n
+}
+
+func sovWire(x uint64) (n int) {
+	for {
+		n++
+		x >>= 7
+		if x == 0 {
+			break
+		}
+	}
+	return n
+}
+func sozWire(x uint64) (n int) {
+	return sovWire(uint64((x << 1) ^ uint64((int64(x) >> 63))))
+}
+func (this *Packet) String() string {
+	if this == nil {
+		return "nil"
+	}
+	s := strings.Join([]string{`&Packet{`,
+		`Type:` + fmt.Sprintf("%v", this.Type) + `,`,
+		`Stat:` + strings.Replace(fmt.Sprintf("%v", this.Stat), "Stat", "Stat", 1) + `,`,
+		`ID:` + fmt.Sprintf("%v", this.ID) + `,`,
+		`Data:` + fmt.Sprintf("%v", this.Data) + `,`,
+		`}`,
+	}, "")
+	return s
+}
+func valueToStringWire(v interface{}) string {
+	rv := reflect.ValueOf(v)
+	if rv.IsNil() {
+		return "nil"
+	}
+	pv := reflect.Indirect(rv).Interface()
+	return fmt.Sprintf("*%v", pv)
+}
+func (m *Packet) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowWire
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: Packet: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: Packet: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Type", wireType)
+			}
+			m.Type = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowWire
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Type |= (Packet_PacketType(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Stat", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowWire
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthWire
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.Stat == nil {
+				m.Stat = &Stat{}
+			}
+			if err := m.Stat.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
+		case 3:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ID", wireType)
+			}
+			m.ID = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowWire
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.ID |= (uint32(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 4:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Data", wireType)
+			}
+			var byteLen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowWire
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				byteLen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if byteLen < 0 {
+				return ErrInvalidLengthWire
+			}
+			postIndex := iNdEx + byteLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Data = append(m.Data[:0], dAtA[iNdEx:postIndex]...)
+			if m.Data == nil {
+				m.Data = []byte{}
+			}
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipWire(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthWire
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func skipWire(dAtA []byte) (n int, err error) {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return 0, ErrIntOverflowWire
+			}
+			if iNdEx >= l {
+				return 0, io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		wireType := int(wire & 0x7)
+		switch wireType {
+		case 0:
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return 0, ErrIntOverflowWire
+				}
+				if iNdEx >= l {
+					return 0, io.ErrUnexpectedEOF
+				}
+				iNdEx++
+				if dAtA[iNdEx-1] < 0x80 {
+					break
+				}
+			}
+			return iNdEx, nil
+		case 1:
+			iNdEx += 8
+			return iNdEx, nil
+		case 2:
+			var length int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return 0, ErrIntOverflowWire
+				}
+				if iNdEx >= l {
+					return 0, io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				length |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			iNdEx += length
+			if length < 0 {
+				return 0, ErrInvalidLengthWire
+			}
+			return iNdEx, nil
+		case 3:
+			for {
+				var innerWire uint64
+				var start int = iNdEx
+				for shift := uint(0); ; shift += 7 {
+					if shift >= 64 {
+						return 0, ErrIntOverflowWire
+					}
+					if iNdEx >= l {
+						return 0, io.ErrUnexpectedEOF
+					}
+					b := dAtA[iNdEx]
+					iNdEx++
+					innerWire |= (uint64(b) & 0x7F) << shift
+					if b < 0x80 {
+						break
+					}
+				}
+				innerWireType := int(innerWire & 0x7)
+				if innerWireType == 4 {
+					break
+				}
+				next, err := skipWire(dAtA[start:])
+				if err != nil {
+					return 0, err
+				}
+				iNdEx = start + next
+			}
+			return iNdEx, nil
+		case 4:
+			return iNdEx, nil
+		case 5:
+			iNdEx += 4
+			return iNdEx, nil
+		default:
+			return 0, fmt.Errorf("proto: illegal wireType %d", wireType)
+		}
+	}
+	panic("unreachable")
+}
+
+var (
+	ErrInvalidLengthWire = fmt.Errorf("proto: negative length found during unmarshaling")
+	ErrIntOverflowWire   = fmt.Errorf("proto: integer overflow")
+)
+
+func init() { proto.RegisterFile("wire.proto", fileDescriptorWire) }
+
+var fileDescriptorWire = []byte{
+	// 253 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0xe2, 0xe2, 0x2a, 0xcf, 0x2c, 0x4a,
+	0xd5, 0x2b, 0x28, 0xca, 0x2f, 0xc9, 0x17, 0x62, 0x4b, 0x2b, 0x2e, 0x2d, 0xc9, 0xcc, 0x91, 0xe2,
+	0x2a, 0x2e, 0x49, 0x2c, 0x81, 0x88, 0x29, 0x9d, 0x65, 0xe4, 0x62, 0x0b, 0x48, 0x4c, 0xce, 0x4e,
+	0x2d, 0x11, 0xd2, 0xe5, 0x62, 0x29, 0xa9, 0x2c, 0x48, 0x95, 0x60, 0x54, 0x60, 0xd4, 0xe0, 0x33,
+	0x92, 0xd4, 0x83, 0xa8, 0xd6, 0x83, 0xc8, 0x42, 0xa9, 0x90, 0xca, 0x82, 0xd4, 0x20, 0xb0, 0x32,
+	0x21, 0x05, 0x2e, 0x16, 0x90, 0x39, 0x12, 0x4c, 0x0a, 0x8c, 0x1a, 0xdc, 0x46, 0x3c, 0x30, 0xe5,
+	0xc1, 0x25, 0x89, 0x25, 0x41, 0x60, 0x19, 0x21, 0x3e, 0x2e, 0x26, 0x4f, 0x17, 0x09, 0x66, 0x05,
+	0x46, 0x0d, 0xde, 0x20, 0x26, 0x4f, 0x17, 0x21, 0x21, 0x2e, 0x96, 0x94, 0xc4, 0x92, 0x44, 0x09,
+	0x16, 0x05, 0x46, 0x0d, 0x9e, 0x20, 0x30, 0x5b, 0xc9, 0x8f, 0x8b, 0x0b, 0x61, 0xb2, 0x10, 0x3f,
+	0x17, 0x77, 0x80, 0xa3, 0xb3, 0xb7, 0x6b, 0x48, 0x7c, 0x70, 0x88, 0x63, 0x88, 0x00, 0x83, 0x10,
+	0x1f, 0x17, 0x17, 0x54, 0x20, 0xc8, 0x35, 0x50, 0x80, 0x11, 0x49, 0x81, 0x8b, 0x63, 0x88, 0xa3,
+	0x00, 0x13, 0x92, 0x02, 0x37, 0x4f, 0x3f, 0x01, 0x66, 0x27, 0x9d, 0x0b, 0x0f, 0xe5, 0x18, 0x6e,
+	0x3c, 0x94, 0x63, 0xf8, 0xf0, 0x50, 0x8e, 0xb1, 0xe1, 0x91, 0x1c, 0xe3, 0x8a, 0x47, 0x72, 0x8c,
+	0x27, 0x1e, 0xc9, 0x31, 0x5e, 0x78, 0x24, 0xc7, 0xf8, 0xe0, 0x91, 0x1c, 0xe3, 0x8b, 0x47, 0x72,
+	0x0c, 0x1f, 0x1e, 0xc9, 0x31, 0x4e, 0x78, 0x2c, 0xc7, 0x90, 0xc4, 0x06, 0x0e, 0x04, 0x63, 0x40,
+	0x00, 0x00, 0x00, 0xff, 0xff, 0xda, 0x30, 0x43, 0x22, 0x26, 0x01, 0x00, 0x00,
+}

vendor/github.com/tonistiigi/fsutil/wire.proto

@@ -0,0 +1,18 @@
+syntax = "proto3";
+
+package fsutil;
+
+import "stat.proto";
+
+message Packet {
+  enum PacketType {
+      PACKET_STAT = 0;
+      PACKET_REQ = 1;
+      PACKET_DATA = 2;
+      PACKET_FIN = 3;
+    }
+  PacketType type = 1;
+  Stat stat = 2;
+  uint32 ID = 3;
+  bytes data = 4;
+}

vendor/golang.org/x/sync/errgroup/errgroup.go

@@ -0,0 +1,67 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package errgroup provides synchronization, error propagation, and Context
+// cancelation for groups of goroutines working on subtasks of a common task.
+package errgroup
+
+import (
+	"sync"
+
+	"golang.org/x/net/context"
+)
+
+// A Group is a collection of goroutines working on subtasks that are part of
+// the same overall task.
+//
+// A zero Group is valid and does not cancel on error.
+type Group struct {
+	cancel func()
+
+	wg sync.WaitGroup
+
+	errOnce sync.Once
+	err     error
+}
+
+// WithContext returns a new Group and an associated Context derived from ctx.
+//
+// The derived Context is canceled the first time a function passed to Go
+// returns a non-nil error or the first time Wait returns, whichever occurs
+// first.
+func WithContext(ctx context.Context) (*Group, context.Context) {
+	ctx, cancel := context.WithCancel(ctx)
+	return &Group{cancel: cancel}, ctx
+}
+
+// Wait blocks until all function calls from the Go method have returned, then
+// returns the first non-nil error (if any) from them.
+func (g *Group) Wait() error {
+	g.wg.Wait()
+	if g.cancel != nil {
+		g.cancel()
+	}
+	return g.err
+}
+
+// Go calls the given function in a new goroutine.
+//
+// The first call to return a non-nil error cancels the group; its error will be
+// returned by Wait.
+func (g *Group) Go(f func() error) {
+	g.wg.Add(1)
+
+	go func() {
+		defer g.wg.Done()
+
+		if err := f(); err != nil {
+			g.errOnce.Do(func() {
+				g.err = err
+				if g.cancel != nil {
+					g.cancel()
+				}
+			})
+		}
+	}()
+}

vendor/golang.org/x/sync/singleflight/singleflight.go

@@ -0,0 +1,111 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package singleflight provides a duplicate function call suppression
+// mechanism.
+package singleflight // import "golang.org/x/sync/singleflight"
+
+import "sync"
+
+// call is an in-flight or completed singleflight.Do call
+type call struct {
+	wg sync.WaitGroup
+
+	// These fields are written once before the WaitGroup is done
+	// and are only read after the WaitGroup is done.
+	val interface{}
+	err error
+
+	// These fields are read and written with the singleflight
+	// mutex held before the WaitGroup is done, and are read but
+	// not written after the WaitGroup is done.
+	dups  int
+	chans []chan<- Result
+}
+
+// Group represents a class of work and forms a namespace in
+// which units of work can be executed with duplicate suppression.
+type Group struct {
+	mu sync.Mutex       // protects m
+	m  map[string]*call // lazily initialized
+}
+
+// Result holds the results of Do, so they can be passed
+// on a channel.
+type Result struct {
+	Val    interface{}
+	Err    error
+	Shared bool
+}
+
+// Do executes and returns the results of the given function, making
+// sure that only one execution is in-flight for a given key at a
+// time. If a duplicate comes in, the duplicate caller waits for the
+// original to complete and receives the same results.
+// The return value shared indicates whether v was given to multiple callers.
+func (g *Group) Do(key string, fn func() (interface{}, error)) (v interface{}, err error, shared bool) {
+	g.mu.Lock()
+	if g.m == nil {
+		g.m = make(map[string]*call)
+	}
+	if c, ok := g.m[key]; ok {
+		c.dups++
+		g.mu.Unlock()
+		c.wg.Wait()
+		return c.val, c.err, true
+	}
+	c := new(call)
+	c.wg.Add(1)
+	g.m[key] = c
+	g.mu.Unlock()
+
+	g.doCall(c, key, fn)
+	return c.val, c.err, c.dups > 0
+}
+
+// DoChan is like Do but returns a channel that will receive the
+// results when they are ready.
+func (g *Group) DoChan(key string, fn func() (interface{}, error)) <-chan Result {
+	ch := make(chan Result, 1)
+	g.mu.Lock()
+	if g.m == nil {
+		g.m = make(map[string]*call)
+	}
+	if c, ok := g.m[key]; ok {
+		c.dups++
+		c.chans = append(c.chans, ch)
+		g.mu.Unlock()
+		return ch
+	}
+	c := &call{chans: []chan<- Result{ch}}
+	c.wg.Add(1)
+	g.m[key] = c
+	g.mu.Unlock()
+
+	go g.doCall(c, key, fn)
+
+	return ch
+}
+
+// doCall handles the single call for a key.
+func (g *Group) doCall(c *call, key string, fn func() (interface{}, error)) {
+	c.val, c.err = fn()
+	c.wg.Done()
+
+	g.mu.Lock()
+	delete(g.m, key)
+	for _, ch := range c.chans {
+		ch <- Result{c.val, c.err, c.dups > 0}
+	}
+	g.mu.Unlock()
+}
+
+// Forget tells the singleflight to forget about a key.  Future calls
+// to Do for this key will call the function rather than waiting for
+// an earlier call to complete.
+func (g *Group) Forget(key string) {
+	g.mu.Lock()
+	delete(g.m, key)
+	g.mu.Unlock()
+}